RECTIFIER CIRCUIT

PURPOSE:To constitute a power supply whose current capacity is large by a method wherein a bridge rectifying operation is performed by MOS power FETs. CONSTITUTION:MOS power FETs (TR1 to TR4) which constitute a bridge rectifier 4a and all constituted of N-channel ones, the FETs (TR1, TR4) and the FETs (TR2, TR3) form one set each, and a control signal which is turned on and off repeatedly is applied to gates of the respective sets. Then, an operating current flows in the order of A C a source for the TR1 a drain E a load 5 F a source for the TR4 a drain D B when the A end of a power-supply transformer 2a is at a positive half cycle, it flows in the order of B D a source for the TR3 a drain E the load 5 F a source for the TR2 a drain C A when the B end of the power-supply transformer 2a is at the positive half cycle, and rectified electric charges are stored respectively in the load 5. In this case, C, D, E and F represent both ends of the bridge rectifier 4a. Thereby, a large-capacity power supply 1 can be constituted.