Secondary Side Serial Resonant Full-Bridge DC/DC Converter

A secondary side serial resonant full-bridge DC/DC converter, being applied in a switching power converter for operating a zero voltage switch (ZVS) and a zero current switch (ZCS), the second-side serial resonant full-bridge DC/DC converter comprising:

• a transistor full-bridge unit, comprising a first MOSFET, a second MOSFET, a third MOSFET, and a fourth MOSFET and being coupled to an input voltage signal, so as to process the full cycle rectification for the input voltage signal;
• a transformer unit, being coupled to the transistor full-bridge unit, and having a turn ratio of 1:N between the primary side coil and the secondary side coil thereof, wherein the full-cycle rectified input voltage signal is transmitted to the secondary side coil from the primary side coil, so as to be transformed to a secondary side voltage signal;
• a resonant unit, being coupled to the transformer unit and having a resonant inductor and a resonant capacitor;
• a rectifying unit, being coupled to the resonant unit and the transformer unit for further rectifying the secondary side voltage signal;
• and
• an output unit, being coupled to the rectifying unit and having a load resistor;
• wherein the resonant inductor, the resonant capacitor and the load resistor constitute a serial resonant circuit having a serial resonant frequency;
• therefore, when the circuit frequency is operated on the serial resonant frequency, the resonant inductor impedance would be offset by the resonant capacitor impedance, such that the secondary side voltage signal can be losslessly transmitted to the load resistor, so as to be outputted.