Self-Adapting Voltage Balancing Method for IPOS DAB Converter With TPS Control

Abstract

Dual active bridge (DAB) converters have been applied to many industrial power supply fields. Input parallel output series (IPOS) DAB converters are capable of broadening the output voltage range and output power level, of which the output voltage balancing control is essentially required. In this article, based on the generalized power model and characteristics of cooperative triple phase shift (CTPS), a self-adapting voltage balancing method is proposed for IPOS DAB converters to strike a balance between wide output voltage and small transient oscillation. Moreover, by employing the proposed method, IPOS DAB converter is able to achieve quasi no reverse power of dual sides by using single current control loop, which helps in reducing the complexity of control loop design and lowing the computation burden. Experiment of the proposed method is carried out to validate the feasibility of the proposed method.