A charger with a maximum output voltage of 250 V and a current of up to 10 A. It is based on the STM32F334 microcontroller and its HRTIM module. Automatic stabilization is performed either by the set voltage or by the set current. This achieves a standard charging circuit for lead-acid batteries. This charger can also operate in the power supply mode with a set voltage from 50 V to 250 V and a set current limit from 0.2 A to 10 A.

This charger is controlled via the RS485 bus. You can set various parameters for voltage, current, temperature, etc. The temperature of the power transistor radiators and the battery temperature are monitored using a remote sensor. The control bus has galvanic isolation from the high-voltage circuits of the charger and processor.

The charger is made according to the circuit of a 2-phase half-bridge converter with a midpoint. The signal of each phase has an adjustable time shift. There are 3- and 4-phase versions of this charger/power supply unit. Each phase has an analog current protection circuit with independent current sensors. This allows the charger to be stopped in the event of short circuits at the output or a sharp increase in load without causing more serious consequences.

One of the design features is the need for careful development of the printed circuit board to ensure the safe flow of significant currents.