RECTIFYING CIRCUIT

PROBLEM TO BE SOLVED: To provide a rectifying circuit with only a few voltage drop by rectifying AC voltage to DC voltage using a parasitic diode inserted, as an equivalent for a rectifying element, between the source and the drain of each MOSFET. SOLUTION: In a full-wave rectifying circuit diagram, solid lines show the flow of forward current when the input AC voltage is positive and dotted lines show the flow of forward current when the input AC voltage is negative. This is a full-wave rectifying circuit with four diodes as rectifying elements replaced with MOSFETs 3. In a full-wave rectifying circuit, forward current is caused to flow through two rectifying elements. The voltage drop of current passing through the rectifying elements increases accordingly, therefore, the voltage drop of a full-wave rectifying circuit is double that of the half-wave rectifying circuit and require more attention. However, by using a parasitic diode connected between the source S and the drain D of each of the MOSFETs 3 as an equivalent for a rectifying element, a rectifying circuit with a little voltage drop can be obtained.