Design of a multi-port converter using dual-frequency PWM control for satellite applications

In solar array-battery power system of satellites, new topology and control strategy have been studied to decrease the volume and weight. In this paper, a multi-port converter with the multimode control is introduced. The control strategy for the module is proposed, which contains domain control and dual-frequency PWM control, i.e. multi-mode control strategy. It is demonstrated that dual-frequency PWM control can use only one switch to regulate the bus voltage and battery charge current simultaneously. Input and output characteristics of different operation modes are analyzed in detail and the parameters design is given. At last, a 28V/4A prototype is built to verify the theoretical analysis.