Design of a zero-current switching battery equalization circuit based on switched capacitors

Abstract

Traditional switched capacitor battery equalization topologies have the problems of high switching losses and hard control. This circuit uses a half-bridge circuit to convert the DC voltage of the battery to a square wave signal and reduces switching losses by using the LC series resonance to realize the zero current switching of the MOSFETs. In this paper, we also propose a simple and reliable driver circuit, which requires only a resistor and a spacer capacitor to shift the control signal to different signal levels and drive the MOSFETs to different levels, thus reducing the cost and difficulty of controlling the circuit. In conclusion, this article demonstrates the feasibility of topology through theoretical derivations, simulation of the circuit and practical experiments to demonstrate the equalization circuit's high efficiency.