Discharge mode

Boost part: the square wave open-loop control of the H-bridge on the low-voltage side, the uncontrolled rectification of the H-bridge on the high-voltage side, and enter the paroxysmal mode when overvoltage or no load

Inverter part: voltage and current feedback control, unipolar SPWM modulation, with UPS mode

Charging mode

PFC part: using voltage and current double closed-loop control, adjust the bus voltage according to the battery voltage, so that the pre-stage LLC works near the resonance point to improve efficiency.

Step-down part: paroxysm + frequency conversion control is used on the high-voltage side, and synchronous rectification is used on the low-voltage side; The battery is charged with constant voltage and constant current

Electrical