The LLC half bridge resonant power supply scheme based on EG6599 and EG4328 chips, with an input voltage of AC 220 ± 10%, can achieve intelligent charging management of 60V12A lead-acid batteries (also customizable as lithium batteries), with multiple protection functions, charging status indication, and heat dissipation design. The circuit parameters are set in a specific way, suitable for the charging field of electric tricycles and four-wheel vehicles.

EG1654 is used as the PFC controller, and EG6599S is used as the LLC controller. After full bridge rectification, the input voltage is boosted to 390V through EG1654, and then converted to 36V DC voltage output through half bridge LLC topology. Under full load conditions, the overall system efficiency is 93% for 220V AC input and 90% for 110V AC input. In addition, this design also has multiple built-in protection functions, including output overcurrent and short circuit protection.

Can regulate the output within a wide range of power supply and load fluctuations, while the switching frequency fluctuation range is relatively small; Throughout the entire operating range, achieve zero-voltage switching (ZVS) of power MOSFETs; All inherent parasitic parameters of the circuit can be used to achieve soft switching, including the junction capacitance of power MOSFETs, leakage inductance, and magnetizing inductance of the transformer

The control part adopts the half bridge LLC resonant converter dedicated chip EG1397, which has functions such as soft start, overcurrent protection, short circuit protection, over temperature protection, and hiccup mode.