ACTIVE EQUALIZATION CIRCUIT, BATTERY MANAGEMENT SYSTEM, POWER SOURCE SYSTEM, AND ELECTRONIC DEVICE

Embodiments of the present disclosure provide an active equalizer circuit, a battery management system, a power supply system and an electrical equipment. The active equalizer circuit comprises a plurality of switching transistors, a driving transformer, a multi-port converter, a buck converter, and a microcontroller. Each of the switching transistors is coupled to a battery cell in the series battery pack on a one-to-one basis. The multi-port converter comprises an equalizing transformer and a bridge converter, each secondary winding of the bridge converter is coupled to a corresponding plurality of battery cells. The buck converter has an input terminal coupled to an output terminal of the series battery pack and an output terminal coupled to an input terminal of the bridge converter. The microcontroller is configured to output a first control signal to the buck converter, to make the buck converter transform an output voltage of the series battery pack and output the transformed output voltage to the bridge converter, and output a second control signal to the bridge converter, to control an operation state of the bridge converter. According to the embodiments of the present disclosure, the cost and volume of the active equalizer circuit can be reduced.