A three-state dual-inductance bi-directional converter and its control in pulse-loaded three-port converters

Abstract

The current-pulse load is generally characterized by wide frequency band and pulse variation, when it is directly connected to the power supply bus. The load power is presented as the instantaneous power. In order to balance the instantaneous power difference between the pulse load and the DC bus, a bi-directional DC/DC converter is usually connected in parallel to compensate for the current fluctuation caused by the characteristics of the pulse load. However, there is a large current spike in the bus current in the pre-stage when the pulse load is changed between light and heavy load. In this paper, a three-state dual-inductance bi-directional converter is proposed. In addition, the load current waveform is directly used to control the inductive branch switches, and an adaptive current feedback control strategy based on the valley voltage loop is proposed to control the power switches. The control method is applicable to the arbitrary change of the frequency and power of the pulse load. Finally, the experimental results show that the three-state dual-inductance bi-directional converter not only eliminates excessive bus current spikes, but also improves the transient response of the three-port power supply system.