面向级联脉冲负载电源的阻抗整形控制策略以抑制输入电流纹波并提升动态响应

To balance the power difference between the pulsed output power and constant input power, the cascaded pulsed load power supply (PLPS) has been proposed in pulsed load applications. In the cascaded PLPS, since the back-end converter is designed with high bandwidth to track pulsed load current, the pulsed power would be easily propagated into the front-end converter. Hence, the pulsed power leads to a large input current ripple and affects the operation of the sensitive power source. In this article, the performance of the control scheme to suppress the input current ripple is investigated from the perspective of the impedance model, and the requirements of the expected impedance are given. To further reduce the input current ripple and improve the dynamic response, impedance-shaping control (ISC) is proposed to reshape the inductor branch impedance. The design considerations for the proposed control schemes are studied. Finally, the cascaded PLPS comprising a phase shift full-bridge (PSFB) converter and an interleaved buck converter are fabricated to verify the validity of the proposed control schemes.