Isolated&non-isolated power supply switching Here are some questions about power supply switching: 1.How to better understand stablized and unstablized or regular and unregular power supply switching? Simply speaking, regular voltage means the output voltage is steady and will not change to change with the load,unregular means when the load arrive the rated voltage,the output voltage has adjust 2.What's the difference between fixed input and wide range input power supply switching? Fixed input means the fixed input voltage,like 5V 12V 15V 24V etc, Wide range input means the input has a distance,like from 9V to 18V,during this voltage,the device can work perfect. 3.What's the difference between isolated and non-isolated power supply switching? Isolated power supply switching means the input and ouput all isolated and independent ground Non-isolated power supply switching means the input and output with common ground Chonda tech power supply switching converters includes the 1000VDC,1500VDC, 3000VDC,4500VDC isolated power supply switching converters,and the dual isolated dual output(input to input isolation and output to output isolation) 2:1 and 4:1 wide input power supply switching DC DC converters from the small powerW5 to big power,if you have any special requirest,just offer your request,thanks for your coopearation.

The best step down converter-ac to dc power supply As the searching report finding that Step-down converter(transformers) are commonly used to convert the 220 volt electricity to the 110 volts required by North American equipment. from our selling data indicate that this Step-down converter mainly from AC TO DC POWER SUPPLY,and input range from 100V to 1000V converter. But What is a step down converter?is one whose secondary voltage is less than its primary voltage. It is designed to reduce the voltage from the primary winding to the secondary winding. This kind of converter “steps down” the voltage applied to it. As a step-down unit, the transformer converts high-voltage, low-current power into low-voltage, high-current power. The larger-gauge wire used in the secondary winding is necessary due to the increase in current. The primary winding, which doesn’t have to conduct as much current, may be made of smaller-gauge wire. CHONDA TECH claims some attentions: 1.please connect the cable strictly according to the icon indicate the ac to dc power supply ,input port have to add the fuse-unput voltage has no negative,don;t worry the ac to dc power supply was fired if the compeletely opposite connection 2. In order to make sure the step-down converter (ac to dc power supply) supply the sufficient voltage and power,try to select the cable as thick as you can 3.if the output port has multiple cable,please make the current be average to each output. For step-down converter and AC to DC power supply products details,welcome to have review our proucts guide line

Wholesale 120v to 12v Dc Converter This is Inverter DC 12V to 120VAC,this converter can deal with the load depend on the converters/transformers variable dc power supply. Chonda tech professional manufacture the AC DC converter and DC DC converter,wholesale variable dc power supply Wholesale 120v to 12v Dc Converter is obviousely belongs to AC DC converter,input range from 85V to 220V condition,isolation converer,high density reliable usage for devices. Low input and high output voltage converter is extremely hotsale,like output range from 100V to 500V CONVERTERS. If you are just seeking for this high qulity and best price and excellence service,don't hestate to contact us immediately.

DC DC 4:1 wide range input power converters in Automotive electronics filed DC DC power converters has the short design cycles,high reliable, system easy to update and advance features,which make the DC DC power converters widely used.CHONDA TECH push the new seriouse 4:1 wide range input power converters on the the market,with the sealed metal shell,high power density,small size for the automotive electronics field. The advanteages has two points: 1. As the automotive eletronics use 12V or 24V power supply,the voltage changes is extremely wide,if use the DC DC power converters input 2:1 will be limited during the working process,if the battery couldn't exchange,and hard to bear this voltage hit.Chonda tech design the 4:1 wide range input DC DC power converters,working temperature from -45 degree to 85 degree,solving the normal power converters lower adjust voltage faulty causing the power convertes couldn't used for automotive electronics field problem.This series power converters is popular used for 12V or 24V power supply autmotive eletronics field. 2. CHONDA TECH 4:1 wide range input DC DC power converers series,adopt the five side metal sealed,isolated 1500VDC,can isolate the automotive electonics powe supply systems super interfence,MTBF more than 100 0000 hours,high efficiency working and stablized working,and enhance the automotive electonics power supply much stronger than before.

24v to 12v converter 24V to 12V converter, adopts imports high integraty switching mode power supply,all the components MATERIAL purchase from the world famouse manufactory,synchronous rectification technology, above 85% efficiency,lowest heat,smallest size and convenience be installed for all the devices. Application for BUS,CAR,SHIP,BOATS,INSTRUMENTS AND EQUIPMENTS,LED,CCTV CAMERA,MONITOR SYSTEMS,ETC RAILWAY STATION,ADVERTISEMENT SCREEN. Mainly features for DC DC COVERTER,24V TO 12V CONVERTER Input output lsolation: adopt the compeletely isolation design 1000VDC/1min Protection: input over voltage protection, short circuit over voltage protection EMI filter: built-in EMI filter unit to reduce interference between power grid and power supply Outline sealed: ultra-thin small integration design, high efficiency high density Cooling method: Natural cooling, without additional radiator Technical features: Input voltage range: 9V-18V 18V-36V 36V-72V 36V-72V(80V MAX) 72V-144V Output voltage and current : +/-5V,9V,12V,15V,24V,48V（voltage adjust range ±10%） Output ripple: 50 Transient : overshoot magnitude; ±5%V Recovery time：200us Effect : source effect: ±2%V Effect of load：±5%V Protection: over voltage, over current, short circuit Temperature: A working termperature：-25-75℃ B storage temperature：-40-85℃ Output voltage steady regulation accuracy : ±1% MTBF : 8*100000 hours Welcome to have more questions to our email, CHONDATECH can produce the dc dc switching power supply converter,24v to 12v converter from 1W to 200W

12v dc power supply CHONDA ND BRAND switch dc dc converter power supply adopts imported components, with advanced technology, design and manufacture meticulously, each switch power supply have been one hundred percent of aging test before delivery, builtin battery of EMI filter, short circuit protection, overload protection, small size, light weight, low working temperature over voltage protection, high efficiency, 105 °C output capacitors, long service life, strictly according to the global voltage. Usage: suitable for office automation equipment, car electronic, instruments and meters, wireless communications equipment, TV, camera, monitor, LED display, etc 12V DC POWER SUPPLY has the follow features: Parameters: Input rate voltage:220VAC Allow input voltage range:100-240VAC Ripple and Noise: 1% of output voltage Output voltage current adjust range:12v 2.1A(±8％) Stablized value: typicially 0.5％ Over protection:115％-135％ EMI: （a） FCC PART 15A B level （b） EN55022，CISPRPUB22A，B level High voltage test: input and shell,input and outout current 2000VAC stay 1min,the leakage current less than 10ma,output and shell plus AC 500VAC 1 min leakage current less than 10mA Insulation resistance: input and Grand,input and output more than 30M The above is the details of 220v-12v dc power supply,if you are interested in the switching power supply 220V-12v and with requests,please contact chondatech for further interaction for more information on 12V DC power supply series,We are manufactory the AC DC converters and power converters

Inverter brief introduction Inverter brief introduction: convert direct current (DC) to alternating current (AC) of the device, the scientific term is (Inverter). Due to changes in frequency converter device voltage or frequency of the main device is called "INVERTER", so the product itself is named "INVENTURE", Generally speaking, we name the steady voltage and frequency AC change to variable voltage or frequency of alternating current (ac) device called a "converter". VVVF: change Voltage, Frequency, Variable Voltage and Variable Frequency). CVCF: Constant Voltage and Constant Frequency (Constant Voltage and Constant Frequency). In order to produce the variable voltage and frequency, frequency converter must first convert the power of the alternating current (AC) to direct current (DC), and then convert direct current (DC) to alternating current (AC). Frequency converter for motor control, can change the voltage, and can change the frequency. But most of the frequency converter used in fluorescent lamp is used to adjust the frequency of power supply. Cars use alternating current generated by the cell (dc) of the equipment is in the name of "inverter" for sale. The working principle of the inverter is widely used in various fields.Take an example, the Power supply of computer switching power, in this application, frequency converter is used to inhibit the reverse voltage, frequency, power fluctuation and the short circuit.

The global flexible PCB market value will amount to $12 billion in 2014 Global flexible PCB (FPCB) market value was $11.321 billion last year, this year will up 9.4% compared 2013.According to the Chinese market analysts study to reach $12.008 billion in 2014, 2015 will be 12.686 billion. Flexible printed circuit board is mainly used in displays (LCD panel and touch screen), computing (HDD and ODD) and communications (mobile phone).Computer applications in 2013, the FPCB occupy 25%, of which 80% is the dominant force in Japanese companies, however, the market is shrinking. In the mobile phones and tablets field, suppliers have high quality requirements, such as samsung, apple, LG, SONY, HTC and nokia hope get through the FPCB, while others may replace the FPCB FFC or common connector. Samsung and apple purchase quantity on FPCB is equivalent to more than 50% of the FPCB markets around the world. In 2013, the FPCB industry was the most significant change in the established manufacturers decline in profit margins and soaring new entrants. New manufacturers have much more advantages with old factories. Survived the high starting point and the difficulty of the early stages, new entrants margins increased obviousely. In addition, the old vendor's production base is located in Chinese mainland, the appreciation of the renminbi and rising labor costs lead to a sharp fall in profits. The biggest FPCB company Mektron had suffered the first loss since set up, the biggest FPCB company in Korea the gross profit rate has decreased 50% in 2013. Hon hai ZDT rely on the advantage of the parent company to get more orders from apple, so its gross margin rose significantly. ZDT mainly based in shenzhen, but it also transfers its fundamental part to low cost regions: Its second base located in qinhuangdao, the third base in huaian.

Common faulty of DC/DC switching power supply mode Different suppliers launch a variety of different DC/DC switching power supply mode in the market at present, different products input voltage, output power, founctions and topology structure are different. Its characteristic is to application-specific integrated circuit (ASIC), digital signal processor (DSP), microprocessor, memory, field programmable gate array (FPGA), and other digital or analog load power supply. The reliability of power supply module is higher, but also may be down, generally the possibility of failure has the following kinds in DC - DC switching power supply module: 1, reduce the output voltage when using the dc dc module 2, module stop work; 3, module output voltage is too high; 4, module input short circuit 5, module output current is too large.

Please take care of your bill of lading documents Currently,one of our customer who are new to the shippment delivery business and all his business delivery all by air,and the God make the joke for him and published for us together. When we send the first big order for him,he change the idea and make the ship delivery to save the cost,but what to us surprise is that he has lost the bill of lading when you get our document sightly and put it as the rubbish,he may forget the bill of lading was the best important document to clear the local customs,do my dear friend,do you know how much important it is?if we can't hand in all the document at least bill of lading to the ship company,we have no rights to get the products,and the ship company will of course don't release the goods for us. the producs had arrived the destination port for couple of days,and he is anxiouse to find the missing lading but finally failured,and which can't change anything while he intend to change the consignee on the bill of lading,because no matter you make the consignee amendent or to make the new bill of lading,the cargo company require the shipper fetch back the first original one,if this original one bill of lading was missing,the shippmer must make this bad on the news papers firstly and last for three days at least,after that the shipper and cargo company should keep well of this news paper for two year,what's the worst tips to do is that the cargo company require the shipper(customer) to make the three times payment equal to the delivery goods as the deposit for two to three years,as being told that the cargo don't wanna to handle to risk,so they ask deposit once anyone else go to the court and make the lawer for them. so everybody,please take care of the bill of lading,let's save the unnecessary cost for happy cooperation.

Please take care of your bill of lading documents

How to find the best power supply? Power supply offer power for the case of each hardware, be considered as the power of the computer center, has the direct impact of the whole system, once the power running problems, system operation will be affected, not only interfere with the normal use, but are more likely to cause hardware damage, causing economic loss, so choose a stable output when installed, pure good power supply is really very important. Then, how does the power to achieve a good power supply? Solidly, Nature is the most basic material, which it’s not only the power supply basis and stable operation, and realize the guarantee of high quality power supply, if materials could not get guaranteed, even if the brilliant structure design will not be fully play, and even affect the normal operation of the power supply. Besides,there are three catagetires for protection test: firstly,The completely EMI filter First let's take a look at is the EMI filter circuit, after it is plugged into a power supply for electric, encounter the first line of "level". The mainly EMI filter circuit is the main purpose of the first filtering effect, eliminate the high frequency noise and jamming signal, at the same time, reduce their produce electromagnetic radiation, to reduce radiation leaks. In general, the best converters are usually equipped with two levels of EMI in power supply. Completed the first level of EMI, the secondary EMI filter, can reduce the interference, smooth realization of mains input, but in some poor power, it could save level of EMI, so there is no doubt that will directly affect the stability of the power supply. In terms of materials, EMI circuit mainly by the yellow square X capacitor, blue Y capacitance and the composition of elements such as copper coil inductance. secondly,High quality capacitor is the basis of stability Capacitance as one of the most basic electronic components in the motherboard, video card, power supply and other electronic products are widely used, and its quality is good or bad nature will directly influence the stability and performance of the products. For capacitance, people usually distinguish brand by region, which are mainly domestic and Japanese capacitance of the capacitor, public think good remark of Taiwan series compared the domestic capacitors, the overall performance is better than recognized Taiwan, of course, also converters can have bigger difference in price. thirdly, Active PFC is the efficiency guarantee In energy conservation and emissions reduction is widely recognised by the masses, and earnestly carry out today, the power conversion efficiency has become a user of four points notice when installed. And speaking of power efficiency, are going to have to mention PFC circuit. PFC circuit is the main function of power factor correction, make the power more save electricity. Called the PFC of power factor correction circuit, divided into two kinds of active PFC and passive PFC, although active PFC on cost is higher, but its energy saving effect is more outstanding, also in the market at present the mainstream high-end power base in the use of this design. The DC - DC module is used to improve converter stability, compared to common transformer, transformer in high load and load have difference can keep good stable output. On the circuit board, most of the DC – DC power supply modules are in the power supply circuit of secondary side parts, and is done with two PCB version up to place, can be easily identified. written orginal by Chondatech engineer

AC DC switching mode power suppy from 1W to 180W AC DC switching mode power suppy from 1W to 180Wfrom for the more information pls visit http://www.chondatech.com/html_info/AC-DC-converter-39.html AC DC converter input category AC DC converter input devided into four catageries: Input range from 85V to 265V Input range from 85V to 165V Input range from 165V to 265V Input range from 110V to 370V AC DC converter parameters output voltage accuracy: single or dual output ±1% dual output voltage or current Vo1 ±1%； Vo2 ±3% load adjust rate ±0.5% ripple noise 20MHz BM full load Vo≤5.0V,≤100mVp-p； Vo≥12V,≤180mVp-p； short circuit, overload, over-voltage protection (long-term since the recovery) isolation voltage input and output 1500VAC≤5mA /1min，input and outside shell 1500VAC≤5mA /1min efficiency 80%（typically value） switching frequency 40-300KHz typically，MAX 330KHz working temperature -25℃~+75℃ MTBF 2X105Hrs

DC DC fixed input voltage W5-1W series Mainly founction features: Input: DC DC 3.3V 5V 12V 24V Protection: input over voltage protection,short circuit over voltage protection Outline sealed: ultra-thin small integration design, high efficiency high density Cooling method: Natural cooling, without additional radiator Power: W5-1W Industrial standard produtcs design, international size 100%Burn-In Low Ripple and Noise Custom Design Availbale 4 Pin SIL/ 8 Pin DIL Package Input Filter With Internal Capacitor RoHS Converter Certified By SGS Net Weight:1.4/1.8g Typical Input/Output Isolatian:1000Vdc （Specifications typical at Ta=+25℃，Nominal input voltage,Rated ouput current unless otherwise noterd） Products type: Input /Output characteristic: Input voltage range: normal min Typ max unit 5V Input Model 4.5 5 5.5 VDC 12V Input Model 10.8 12 13.2 24V Input Model 21.6 24 26.4 Output voltage accuracy: +/-5.0 % Switching frequency:100KHz� Temperature coefficienty:+/-0.01(Typ) � a+/-0.02 max� Isolation voltage: 60 second/0.5ma 1000Vdc Isolation resistance: 500Vdc 1000mΩ Isolation capacitance: 1KHz/250mV rms 40pF Max line regulation： 1.3% General characteristic: Woking temperature: -40℃～+85℃ Power reduction rate:3.75% / ℃ Storage temperature:-40℃～+105℃ Outshell temperature:+80℃ max Cut off current time:80ms(typ)/ at Vin:100VDC Start delay time:500ms(typ)/ at Vin:1200VDC Dynamic response: 25% standard load move rate ±4%/500uS Humidity: 95% max Temperature drift: 0.02%/℃ Switching frequency: 65-100kHz(typ) Efficiency: 75%(typ) Insolation: 4000VDC/1Min（special 3000VAC） Insolation resistance input to output : 500Vdc 100000G Leakage current:0.03mA RMS typ. 1200VDC Saftey class: CLASS Ⅰ MTBF: >215,000h @25℃ Input voltage and the load relationship characteristic: Dynamic load response: Single output SIP Size: Single output DIP Size: Recommand footprint Size:

Switched-mode power supply A switched-mode DCDC power supply (switching-mode power supply, SMPS, or power supply switching) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Like other power supplies, an SMPS transfers power from a source, like mains power, to a load, such as a personal computer, instruments, train station, railway, ship and boat and so on while converting voltage and current characteristics. Unlike a linear power supply, the pass transistor of a switching-mode DC DC power supply continually switches between low-dissipation, full-on and full-off states, and spends very little time in the high dissipation transitions, which minimizes wasted energy. Ideally, a switched-mode power supply dissipates no power. Generally speaking, the DC DC/AC DC converter switched module are widely used company with the PCB broad, which looks like a sister to support each other and help the engineers to finish as many design as possible. Which can be devided into two types,that; is step down and boost voltage switched converter .Voltage regulation is achieved by varying the ratio of on-to-off time. In contrast, a linear power supply regulates the output voltage by continually dissipating power in the pass transistor. This higher power conversion efficiency is an important advantage of a switched-mode power supply. Switched-mode power supplies may also be substantially smaller and lighter than a linear supply due to the smaller transformer size and weight，which can save more space for the equipment to make the shipment be more effective, that’s why more and more power supply factories use the switched module instead switching power supply. Switching regulators are used as replacements for linear regulators when higher efficiency, smaller size or lighter weight are required. They are, however, more complicated; their switching currents can cause electrical noise problems if not carefully suppressed, and simple designs may have a poor power factor.

24v to 75V dc boost high voltage power module design An on-board equipment need a 24v to 75V dc boost high voltage power module, the first set of discrete design scheme of power supply design formality, integration is poor and lack of practical verification, leads to unreliable power supply protection, key technical indicators do not meet the design requirements. In improving design work, we adopted the mature technology of high reliability of the DC/DC module to complete the design. A single DC/DC module maximum output voltage is commonly + 48 v, to get a higher output voltage, must use the module of input and output isolation characteristics, adopt the method of module series. Due to the power input voltage of + 24 V, so this design USES three modules in series to get 75 V. DC/DC switched power supply output impedance is extremely low, even three modules in series the serial output impedance is negligible relative to the load. 1.design construction and working principle This design by PAF600F24-28 core power module , with the input parallel output series, realize dc 24 v to 75 v voltage conversion. Use an external potentiometer can adjust output voltage, within a certain range output voltage can be in - 60% + 60% of nominal value within the scope of adjustment. A single module has the highest output voltage adjustable, 110% to 28 V = 30.8 V, the minimum output voltage adjustable, 60% to 28 V = 16.8 V. Such three modules in series can get a wide output voltage range: 50.4 V boast is 92.4 V. When the three modules output adjust to 25 v can make the 75V. then the output current is 600 garment = 24 25 A. At the same time the booster power also has the start voltage monitoring and control, over-current, over-voltage, overheating, etc protection functions, to ensure safety and reliable power supply working. Three modules in series working principle in figure 1 figure1 Three modules in series working principle Figure 2 for the application of a single power supply module circuit, the input electrolytic capacitor C1 for energy storage capacitor, can absorb module at the input voltage peak at the same time.C2 and C3 as common mode filter capacitors, using 2 kv high-voltage ceramics capacitors.D1 for transient absorption diode TVS, impact on the voltage transient and impact protective inhibitory effect, can prevent the power supply module is damaged while the occurrence of the transient pressure peak, TVS also have electrostatic protection function, to ensure that the module of work safety is great significance. In addition, use insurance tube can prevent the input unexpected reverse the damage module. figure2 single power module application circuts 1.1 solution comparison Figure 3 for booster power principle of discrete element program block diagram. The solution requires each function unit shall be a separate design, the whole design integration is quite low. Especially for isolation step-up transformer and power conversion circuit H bridge, as not very special design, only the conventional product, cause the volume is too big, and the whole design without sufficient aging test and validation of the actual work, which often requires to pass through many times repeatedly modification and perfect to meet the design requirements, not only time-consuming and also inefficient. In a DC/DC power supply switching module, power transformer and H power special form of bridge are designed to be flat, integrated in the module encapsulation, saved a space greatly. And power supply module technology already quite mature, high reliability, the designer just certain peripheral module as the core design, reasonable use of modules in series, in parallel technology, according to the design demand booster or power expansion, satisfy the requirement of technical indicators can be designed, good performance of work highly reliable integrated power supply. Compared with the discrete scheme, shorten the design cycle, greatly improve the reliability and technical indicators. figure 3 Booster power principle of discrete element program 1.2 Membrane filter technique Used in the module at the input common mode choke is very effective in membrane filter in circuit, under the effect of common mode interference signal, the choke on flux produced by the two coil in the same direction, reinforce each other, each coil inductance value is twice as many exist alone. So for power produced by high frequency common mode noise, choke the equivalent impedance is high. Therefore, common mode choke coil to common-mode interference has a strong inhibitory effect, and presents a low impedance, current differential mode and minimal loss of dc current to useful. Another effective method to reduce common-mode interference is to join the bypass capacitor, as shown in figure 2, C2, C3, used to bypass the common-mode current, to reduce the noise between the input line, at the same time also can absorb the input voltage surge.C2, C3, choose 4700 pf / 2 kv high-voltage ceramics capacitors. To prevent interference, introduced parasitic inductance, capacitance pins should be short as far as possible 2.Protecting function design and electromagnetic compatibility measures In figure 1, D1, D2 and D3 for fast recovery diode, all the protection devices in series, function is to prevent the reverse voltage with any power supply module, D1, D2, D3, reverse pressure is more than twice the rated output voltage, electric current is more than twice the rated power output current, to the pressure drop should be small as far as possible. In figure 2 ,D1, D2 for TVS diode (surge voltage absorber), TVS has a very short response time and high surge absorbing ability, can suppress transients voltage, as a result of the inductive load when switching voltage, can also be used to protect equipment or circuits from electrostatic and induction lightning over-voltage generated by the impact. TVS to protect the power system is in the bypass absorption way, and reduce the electromagnetic interference, and improve the power system reliability and life. Using TVS diode breakdown voltage is 10 yu higher than by working being protection voltage, in order to prevent the breakdown voltage circuit working voltage close to TVS, causing a leakage current TVS and affect the normal work of the circuit; Also can avoid the TVS to fall into line breakdown voltage caused by environment temperature change working voltage range. Add filter capacitance on the module output voltage adjustment end will help to reduce the ripple. Through the power supply system is to adjust the end and output end polyester capacitor filter, power within various filtering measures such as using twisted-pair go line, eventually making + 75 v power supply output ripple control in 400 ~ 600 mv, met the 75 v power supply ripple voltage chest 750 mv using requirement.

AC DC converter & DC DC converter: DC DC converter power module Power module can b...

AC DC converter & DC DC converter: DC DC converter power module Power module can b...

New Products:DC DC converter input 100V to 1000V dual output New Products:DC DC converter input 100V to 1000V power module dual output Mainly founction features: Input: DC DC wide input voltage 100-1000VDC Input: DC DC wide input voltage 210-1200VDC Protection: input over voltage protection,short circuit over voltage protection Outline sealed: ultra-thin small integration design, high efficiency high density Cooling method: Natural cooling, without additional radiator Power: 10-25W Industrial standard produts design, international size Products type: model size power output V1/AM output V2/AM ripple efficiency NH10-V2D05 70×48×23.5mm 10w ±5V/1.0A 100 72 NH10-V2D12 ±12V/0.42A 100 78 NH10-V2D15 ±15V/0.33A 100 80 NH10-V2D24 ±24V/0.208A 100 80 NH10-V2E0505 5V/1A 5V/1A 100 77 NH10-V2E0512 5V/1A 12V/0.42A 100 78 NH10-V2E0524 5V/1A 24V/0.208A 100 79 NH10-V2E1515 15V/0.33A 15V/0.33A 100 79 NH15-V2D05 70×48×23.5mm 15w ±5V/1.5A 100 72 NH15-V2D12 ±12V/0.625A 100 78 NH15-V2D15 ±15V/0.5A 100 80 NH15-V2D24 ±24V/0.3125A 100 80 NH15-V2E0505 5V/2A 5V/1A 100 77 NH15-V2E0512 5V/2A 12V/0.42A 100 78 NH15-V2E0524 5V/2A 24V/0.208A 100 79 NH25-V2D05 70×48×23.5mm 25w ±5V/2.5A 150 72 NH25-V2D12 ±12V/1A 150 78 NH25-V2D15 ±15V/0.83A 150 80 NH25-V2D24 ±24V/0.5A 150 80 NH25-V2E0505 5V/3A 5V/2A 150 77 NH25-V2E0512 5V/3A 12V/0.9A 150 78 NH25-V2E0524 5V/3A 24V/0.45A 150 79 Input characteristic: Input voltage range:: 100～1000VDC（210-1200VDC） Input current: 100VDC NH15 250mA , typ NH25 280mA , typ surge current 10A (TYP) 100V 20A (TYP) 1000V Output characteristic: Output voltage steady accuracy: ±1% Original source effect: ±0.5% (typ) Load adjust rate: (10%~100%) ±2% (typ) Min load: 0% Output ripple and noise(peak value)： 100mV(typ) (20MHz Bandwidth) Short-circuit protection long time Continuous,/automatic resume Output over exceed current protection ≥1.1 times General characteristic: Woking temperature: -40℃～+55℃ Power reduction rate:3.75% / ℃ Storage temperature:-40℃～+105℃ Outshell temperature:+80℃ max Cut off current time:80ms(typ)/ at Vin:100VDC Start delay time:500ms(typ)/ at Vin:1200VDC Dynamic response: 25% standard load move rate ±4%/500uS Humidity: 95% max Temperature drift: 0.02%/℃ Switching frequency: 65-100kHz(typ) Efficiency: 75%(typ) Insolation: 4000VDC/1Min（special 3000VAC） Insolation resistance input to output : 500Vdc 100000G Leakage current:0.03mA RMS typ. 1200VDC Saftey class: CLASS Ⅰ MTBF: >215,000h @25℃ Input voltage and the load relationship characteristic: Dynamic load response: Size: outside shell size A B C D E F G H I 20 70 62 5.75 23 48 23.5 ≥6.0 4 sectional dimension:1.0mm terminal accuracy:0.1mm other accuracy: ±0.5mm pin 1 2 3 4 5 6 7 8 9 V2DXX No Pin -Vin +Vin No Pin -Vo No Pin No Pin No Pin +Vo V2EXX No Pin -Vin +Vin No Pin -Vo1 +Vo1 No Pin -Vo2 +Vo2

DC DC converter power module Power module can be directly mounted on the printed circuit board, power supply has two types, a step-down and step up, its characteristic can be devided into application-specific integrated circuit (ASIC), digital signal processor (DSP), microprocessor, memory, field programmable gate array (FPGA) and other digital or analog load to provide power supply. DC - DC converter Power module are realized by the concept of switch power supply. DC - DC converter has a step-down and step up. If send 10V to DC - DC converter, DC - DC converter has internal oscillator and chopping module, for example, in a time period allows 10 v get through, another time is not allowed to 10 v get through (equal to 0 v). And on the output side has a filtering capacitor, as long as the capacitance is large enough, the result is equivalent to the middle of the pulse waveform of calculus, and a 5 v dc output waveform. The set down process has successfully against the power exhausted on the power modules. and internal shock part control the duty ratio can change the value of the output voltage (within 10 v), making the output constantly (such as DC - DC converter input range is from 6 v to 16 v, output 5V, only if within the scope of this input, the output is 5 v ,there are only zero point zero a few volts difference. Features: Small dimension,high reliable Output voltage stability,accuracy ±3% High performance price Multipal input and output Build-in input filter,lowe electromagnetic compatiblility features aluminum shell sanded oxidation, six sides shielding typical application: industrial instruments, digital circuit, electronic communication equipment, satellite navigation, remote sensing, remote sensing and ground communication of scientific research equipment, and other fields 1. input characteristic input voltage range:9VDC-18VDC,18VDC-36VDC,36VDC-72VDC,72VDC-144VDC 2. output characteristic Transient : overshoot magnitude; ±5%V Recovery time ：200us Effect : source effect: ±2%V Effect of load ：±5%V Protection: over voltage, over current, short circuit Temperature: A working termperature：-25-75℃ B storage temperature：-40-85℃ C humidity: 10RH～90RH D Max shell temperature: +90 degree Output voltage steady regulation accuracy : ±1% MTBF : 8*100000 hours Isolation Voltage: input and output 1500VDC Ripple and noise: ≤50mVpk-p DC DC converter application areas DC DC power module supply used in several aspects Power, mainly on integrator and electric meter and smart meters Industrial control, industrial control field Health care, medical equipment, mainly to protect the tire gauge, monitor, etc. 4. Military, Military industry is very widely used In the military equipment. DC DC converter Several indicators power P = UI input voltage has AC input and DC input output voltage is DC output mostly,but also has AC output working temperature isolation voltage: isolation voltage isolation is the separation of the output and input circuit.there are several founctions below: 1. current transformation 2. in order to avoid interference between input and output 3. the huge difference between input and output circuit of signal characteristics, such as with weak signal control of high voltage equipment, package size have a pin, patch, and screw. Output has a single output, dual output and multipal output. general speaking, this power module is called load point (POL) power supply system or use some power supply system (PUPS). Because there are a lot of the advantages of the modular structure, power module is widely used in switching equipment, access equipment, mobile communications, microwave communications and optical transmission, routers and other communications and automotive electronics, aerospace, etc. DC DC converter advantages

New Products:DC DC converter input 100V to 1000V single output New Products:DC DC converter input 100V to 1000V wide range power module single output Mainly founction features: Input: DC DC wide input voltage 100-1000VDC Input: DC DC wide input voltage 210-1200VDC Protection: input over voltage protection,short circuit over voltage protection Outline sealed: ultra-thin small integration design, high efficiency high density Cooling method: Natural cooling, without additional radiator Power: 5-25W Industrial standard produts design, international size Products type: model size power output V1/AM output V2/AM ripple efficiency NH05-V2S05 70×48×23.5mm 5W 5V/1A 100 75 NH05-V2S12 5W 12V/0.42A 80 100 80 NH05-V2S24 5W 24V/0.23A 82 100 82 NH10-V2S05 70×48×23.5mm 10W 5V/2A 100 77 NH10-V2S12 10W 12V/0.9A 100 81 NH10-V2S15 10W 15V/0.66A 100 81 NH10-V2S24 10W 24V/0.45A 100 82 NH15-V2S05 70×48×23.5mm 15W 5V/3A 100 77 NH15-V2S12 15W 12V/1.25A 100 82 NH15-V2S24 15W 24V/0.625A 100 84 NH20-V2S05 70×48×23.5mm 20W 5V/4A 100 77 NH20-V2S12 20W 12V/1.66A 100 82 NH20-V2S24 20W 24V/0.83A 100 84 NH25-V2S05 70×48×23.5mm 25W 5V/5.0A 100 77 NH25-V2S12 25W 12V/2.0A 100 82 NH25-V2S15 25W 15V/1.66A 100 83 NH25-V2S24 25W 24V/1.0A 100 84 Input characteristic: Input voltage range:: 100～1000VDC（210-1200VDC） Input current: 100VDC NH05 100mA , typ NH10 230mA , typ NH15 250mA , typ surge current 10A (TYP) 100V 20A (TYP) 1200V Output characteristic: Output voltage steady accuracy: ±1% Original source effect: ±0.5% (typ) Load adjust rate: (10%~100%) ±2% (typ) Min load: 0% Output ripple and noise(peak value)： 100mV(typ) (20MHz Bandwidth) Short-circuit protection long time Continuous,/automatic resume Output over exceed current protection ≥1.1 times General characteristic: Woking temperature: -40℃～+55℃ Power reduction rate:3.75% / ℃ Storage temperature:-40℃～+105℃ Outshell temperature:+80℃ max Cut off current time:80ms(typ)/ at Vin:100VDC Start delay time:500ms(typ)/ at Vin:1200VDC Dynamic response: 25% standard load move rate ±4%/500uS Humidity: 95% max Temperature drift: 0.02%/℃ Switching frequency: 65-100kHz(typ) Efficiency: 75%(typ) Insolation: 4000VDC/1Min（special 3000VAC） Insolation resistance input to output : 500Vdc 100000G Leakage current:0.03mA RMS typ. 1200VDC Saftey class: CLASS Ⅰ MTBF: >215,000h @25℃ Input voltage and the load relationship characteristic: Dynamic load response: 动 Size: outside shell size A B C D E F G H I 20 70 62 5.75 23 48 23.5 ≥6.0 4 sectional dimension:1.0mm terminal accuracy:0.1mm other accuracy: ±0.5mm 1 2 3 4 5 6 7 8 9 No Pin -Vin +Vin No Pin -Vo No Pin No Pin No Pin +Vo

A multiplexed output switching power supply design To modern electronic systems, even the most simple by single chip microcomputer and a single I/O interface circuit composed of electronic system, the switching power supply voltage is usually made up of + 5 v, + 12 v, +15 v or + multiplex composition and so on, and for more complex electronic systems, more practical use of supply voltage. At present many voltage combination is mainly composed of the following: +3.3V，+5V，±15V，±12V，-5V，±9V，+18V，+24V、+27V、±60V、+135V、+300V、-200V、+600V、+1800V、+3000V、+5000V (including a demand more than the same switching power supply voltage of the system), etc. Different electronic systems, not only for the above all kinds of voltage combination has strict requirements, but also to the switching power supply voltage of the electrical characteristics are more strict requirements, such as voltage accuracy, (current) output voltage of the load capacity, voltage ripple and noise, start delay, rise time, recovery time, voltage overshoot, the power delay time, step load response, step linear response, cross regulation, cross interference, etc.

China pouring billions into London real estate The British capital has become a magnet for buyers from the mainland, with investments having risen 1,500 percent since 2010, reports Zhang Chunyan Chinese investment in London real estate has increased remarkably and will continue in the coming years, industry insiders and companies said. Greenland Holding Group, a Shanghai-based and State-owned developer, announced its 1.2 billion pounds ($1.97 billion) investment in two overseas development projects in London on Jan 7. The latest deal shows Chinese companies are entering the capital's real estate market enthusiastically. Research released last December by Jones Lang LaSalle Inc, a Chicago-based real estate service and investment company, showed Chinese investment in London real estate has risen more than 1,500 percent since 2010, increasing from 54 million pounds to more than 1 billion pounds at the end of the third quarter of 2013. This increase means that Chinese investment in London real estate now accounts for more than 50 percent of the total figure for Chinese investment in the rest of Europe, which stood at 1.9 billion pounds in 2013. The increase in investment has repositioned China as the third-largest non-domestic purchaser in the UK, behind Germany and the US, which invested 1.2 billion pounds and 1.1 billion pounds respectively in other countries. "Among China's investment in the UK, real estate has been an obvious hot spot in recent years," said Zhou Xiaoming, minister counselor of the Chinese embassy in the UK. Offices, retail and industrial units, hotels and mixed developments have proven to be the most attractive asset classes to Chinese buyers. Deals in 2013 include the sale of the landmark Lloyd's building to Ping An Insurance (Group) Co of China Ltd for 261 million pounds; a significant investment in development sites such as the Royal Albert Dock, which will be developed by Chinese Advanced Business Park Holdings Group Co Ltd; and the famous Crystal Palace Park, which will be regenerated by Chinese real estate giant Zhongrong Group Co Ltd. Dalian Wanda Group Corp Ltd, one of China's largest and most ambitious conglomerates, closed two deals last June, investing 700 million pounds to build a five-star hotel by the River Thames, which runs through London, and buying a 92 percent share of Sunseeker Yachts for 320 million pounds. It's reported that China's sovereign wealth fund, China Investment Corp, has been negotiating with the US private equity group the Blackstone Group LP to take over a commercial park in London. The deal is reportedly worth $1.28 billion. Overseas gold rush The microeconomic reason is that China has shown consistent economic growth, escaping the economic downturn felt elsewhere globally. As a result, big Chinese companies have the buying power to go abroad and seek globalized development. Jon Neale, head of UK research at Jones Lang LaSalle, said China's economic growth — while slower than over the past decade — is still unparalleled in human history. The large number of Chinese companies, businesspeople and students who go abroad has also given Chinese real estate developers enough confidence to undertake their own overseas "gold rush". Most Chinese real estate enterprises that have marched into the overseas market have entered those countries where there are many Chinese companies and residents, such as the US, Canada and the UK. ABP (China) Holding Group Co Ltd Chairman Xu Weiping said his business park projects are aimed at Chinese and Asian companies. report by china daily Jan 14th 2014

Using DC DC converter power supply advantages Different suppliers launch a variety of different power supply modules in the market, they all have the different input voltage, output power, functions. Using the power module can save development time, make the product put into the marketed be faster, so the power supply module is much more welcome than that of integrated solutions. Power module has the following several advantages: 1. Each DC DC converter module can be individually strict testing, to ensure its highly reliable, including electric testing, to eliminate substandard products. In contrast, integrated solution is difficult to test, because the entire power supply system and other functions of circuit system is closely linked together. 2. Different suppliers can design the same DCDC converter module. To offer the engineers difference options 3. Each module design and test shall be conducted in accordance with the standards of performance, which can help to reduce the adoption of new technology on the wind cost. 4. If adopt the intergrated solutions, once the power supply systems is broken down, requiring to replace the main board to proceed working. but if use DCDC converter power module instead, just replace the converter module shall work normally, which can save cost and the research time

Power module heat testing steps As small volume power module supply, is moving toward low input voltage, high current output, and large power density direction development. However, high integration, high power density makes the unit volume on the influence of temperature more and more become system reliable work, the biggest obstacle to performance improvement. Statistics show that the electronic temperature rise every 2 ℃, a 10% drop in its reliability, the life in temperature 50 ℃ is 1/6 when the temperature 25 degree. So hot design purpose is to discharge heat in a timely, and make the temperature of the products at a reasonable level, ensure that components of the thermal stress in the worst environment temperature still will not exceed the specified value. For very valued the reliability of thepower supply, heat treatment is necessary in the design of a ring. heat production to investigate thermal design method, firstly must know how to produce power module supply temperature rise is. According to the law of conservation of energy, the power input should be equal to the total power output of the total power, also the energy conversion efficiency (eta) constant at 100%, but the actual situation is the conversion efficiency (eta = 1 - Ploss/Ptotal) is less than 100%, which means there will be a part of the energy is lost (Ploss).Then where is this part of the loss of energy consumption? In addition to a small part of into electromagnetic waves spread into the air, the rest were turned into heat energy, to promote its temperature increase.High temperature can make the power equipment internal invalidation, the reliability of the entire device is reduced. Contact loss power and the parameters of the heat is heat resistance (thermal hold), it is defined as the heating device to heat release around the "resistance", it is because of the existence of "resistance", makes the hot (hot points) and around a certain temperature, like electric current flows through the resistor creates a voltage drop.The thermal resistance of different material is different, the smaller the thermal resistance, heat dissipation is stronger, the unit for ℃ / W. 1 modeling analysis From the above analysis we can get to calculate temperature rise of the first method: establish the loss power of the components of each part and thermal resistance model, and then according to the following formula calculating the temperature rise of the power device. caculation of temperature rise of a basic expressions: Δ Τ = RthJ - X • Р loss (1) Among them, the Δ Τ = temperature difference value or temperature rise;RthJ - X = power devices from the node to the thermal resistance of X. It can be seen: since components is the root cause of the heat loss of power, then find out the loss of power devices is the key to solve the heat treatment. Now with Jin Shengyang company a 12 w, efficiency as explained 91% of the products. For who drive synchronous rectifier excitation is based on PWM converter, general application circuit principle as shown in figure 1. The loss of power devices is shown in figure 2.In figure 2, the Pt is the original edge transformer loss; The wastage of the Pl is the output filter inductance; The wastage of the Pmos transistor MosFET is;Pd1 is the wastage of the rectifier diode;Pd2 is fly-wheel diode loss; Pother is loss and other device Now, some of the semiconductor device manufacturers can give more detail about the depletion of the parameters, and the power supply r&d staff, also can calculate the power device in the actual engineering, the actual loss, in turn, constantly corrected these values, make the loss of these components can be very close to the real value. So request out of the power device in the actual temperature rise resulting from consumption of a certain power of, now the key to consider the thermal resistance. But the thermal resistance value is usually affected by the following factor is very big, such as loss of power components of the air flow speed, direction, the level of disturbance, the influence of the neighboring power components, the direction of the PCB board, etc. So the general thermal measurement conditions is very strict. Now look at for a is used for natural air cooling, but around the seal and no fan power components of thermal test method. Thermal power components in the test section is shown in figure 3.

A high efficiency DC - DC power module scheme DC/DC power module is widely used in the design of electronic products, the secondary power supply, it will be a power supply output voltage of a single quadratic transformation, into various need voltage, provided to the chip. Because the module is small size, with high power density requirements, at the same time the work environment is relatively poor, so requires the high reliability; power module general working temperature is -20 ~ 55 ℃, MTBF (MTBF) requirements in more than 200000 hours. This paper puts forward a kind of based on UC3843 chip implementation scheme of DC/DC power module simple circuit, reliable work, high conversion efficiency.