Since average current is low, voltage difference between 7812 input and output is not too great, the power dissipated by the 7812 is not too high and no heat sink is required. 2 bulk capacitors (470uF, 200V each) are used for the half-bridge converter.Īn auxiliary 50Hz transformer (18V 100mA) is used to provide auxiliary low voltage output, which is rectified, filtered and regulated to 12V with a 7812 to power the SG3525, IR2110 and related circuitry. The output signals of the SG3525 are fed into a IR2110 high-low side driver which drives the 2 MOSFETs (IRF840) configured for half-bridge topology. The primary side PWM is controlled by SG3525 PWM chip. To be incorporated in SMPS inverter with charger. Final test circuit (on PCB) for battery charging.
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