Double-Output Half-Bridge LLC Serial Resonant Converter

A double-output half-bridge LLC serial resonant converter, comprising:

• a half-bridge rectifying unit, comprising a first MOSFET and a second MOSFET, and being coupled to an input voltage signal for processing a full cycle rectification to the input voltage signal;
• a first resonant unit, comprising a first resonant inductor and a first resonant capacitor, and being coupled to the half-bridge rectifying unit for receiving the full-cycle rectified input voltage signal;
• a first transformer unit, being coupled to the half-bridge rectifying unit, wherein the input voltage signal is transmitted to the secondary side coil from the primary side coil of the first transformer unit, so as to be transformed to a secondary side voltage signal;
• a first rectifying unit, being coupled to the first transformer unit for further rectifying the secondary side voltage signal;
• a first output unit, being coupled to the first rectifying unit and having a first load resistor, wherein the first resonant inductor, the first resonant capacitor and the first load resistor constitute a serial resonant circuit, and the serial resonant circuit making the secondary side voltage signal be losslessly transmitted to the first load resistor, so as to be outputted;
• a second resonant unit, comprising a second resonant inductor and a second resonant capacitor, and being coupled to the half-bridge rectifying unit for receiving the full-cycle rectified input voltage signal;
• a second transformer unit, being coupled to the half-bridge rectifying unit, wherein the input voltage signal is transmitted to the secondary side coil from the primary side coil of the second transformer unit, so as to be transformed to the secondary side voltage signal;
• a second rectifying unit, being coupled to the second transformer unit for further rectifying the secondary side voltage signal;
• a second output unit, being coupled to the second rectifying unit and having a second load resistor, wherein the second resonant inductor, the second resonant capacitor and the second load resistor constitute a serial resonant circuit, and the serial resonant circuit making the secondary side voltage signal be losslessly transmitted to the second load resistor, so as to be outputted;
• a voltage dividing unit, being coupled to the first output unit and the second output unit, used for processing a voltage division to a first output voltage of the first output unit and a second output voltage of the second output unit;
• a voltage regulating unit, comprising at least one operational amplifier and being coupled to the voltage dividing unit for regulating and modulating the first output voltage and the second output voltage;
• a light-coupling isolation unit, being coupled to the voltage regulating unit;
• and
• a control unit, being coupled to the light-coupling isolation unit, wherein the control unit is used for controlling the switch of the first MOSFET and the second MOSFET, moreover, the light-coupling isolation unit isolating the control unit from the first output voltage and the second output voltage.