With the development of various electric vehicles, the demand for power battery chargers will increase. The quality of the charger is related to the performance of the battery and the longevity of the battery. The intelligent nature of the charger itself is related to the user's ease of use and power system billing. Different batteries, different characteristics, charging strategies are also different. If a battery charger is completed, it is easy to expand the technology to other battery types.
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EMI filter circuit: 
C1 and L1 form the first-stage EMI filter; C2, C3, C4 and L2 form the second-stage filter; L1 and L2 are the common-mode inductors.
The rectification and power factor correction circuit flows through the diode current ID=3.55A; the diode reverse voltage V=373V; considering the actual working condition, the BR601 (35A/1000V) is selected;
Power factor correction: BOOST topology has low output resistance, simple hardware circuit and control, and mature technology, so BOOST structure is selected;
Chip selection: TI's UCC28019 can control the power output to 100W-2KW, the power factor can be increased to 0.95, in line with the design requirements, so this design uses this chip; 
DC-DC main topology scheme selection:
In the case that the switch tube is subjected to peak current and voltage, the full bridge output power is twice that of the half bridge, and when the power is greater than 500 W, the full bridge is more suitable than the half bridge, so this design adopts a full bridge topology. After rectification and filtering, the maximum voltage is 373V, and the maximum primary current is 3.5A. Consider the actual working condition, choose FQA24N50, the maximum reverse voltage of the rectifier diode is 100V, and the current is 10A. Considering the actual working conditions, we choose MUR3060 (600V/ 30A).
Full bridge circuit diagram: 
Rectifier filter output circuit: 
Drive circuit: 
The PWM signal is isolated by the optocoupler and enters the half-bridge driver chip IR2110 through the inverter. The Q1 and Q2 half-bridge driver circuits are shown in the figure. The Q3 and Q4 driver circuits are the same as this circuit.
Auxiliary Power Supply Module Power Supply PWM Control The chip used in the power core control part of this design is the GM chip SG3525. The control circuit is as follows: 
Sampling circuit 
Thermal protection circuit This design system can detect battery temperature, charger temperature, when the battery is over temperature, it will turn off the PWM output waveform, so that the circuit stops working, and the MCU will alarm, when the charger is over temperature, the air cooling system will open. If the temperature continues to rise, the charger will stop working.
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