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