提出一种应用于航天器分布式供电系统的零电压开关（ZVS）三端口DC-DC变换器（TPC）。对于集成双Buck/Boost双有源桥DC-DC变换器型TPC,一次侧开关管的ZVS范围与3个端口的电压及3个端口之间的传输功率有关。为了实现一次侧开关管ZVS范围的扩展,提出在电路拓扑结构中引入基于耦合电感的辅助电路,相较于传统ZVS实现方法,该拓扑可防止蓄电池端口电流波形上的陷波,进而有利于航天器分布式供电系统中蓄电池寿命的延长。此外,磁耦合电感可减少电感数量,不仅起到滤波作用,还为主开关管提供ZVS实现条件。最后,搭建TPC样机进行实验验证,结果验证该拓扑与控制方法的可行性。
Abstract
This paper proposes a zero-voltage-switching （ZVS） three-port DC-DC converter （TPC） for spacecraft power system. For the TPC which integrates interleaved Buck/Boost converter （IBBC） with dual-active-bridge DC-DC converter （DAB）, due to the ZVS range of MOSFET of the primary side is related to the power transmitted between the two ports of the primary side, in order to expand the ZVS range of the main switch, an auxiliary circuit based on coupled inductor is introduced into the topology. Compared with the traditional ZVS implementation method, this topology can prevent the notch on the current waveform of the battery port, which is beneficial to prolong the life of the battery in the spacecraft power system. The magnetic coupling inductor reduces the number of inductors, plays a filtering role, and provides the ZVS condition for the main switch. Finally, a TPC experimental prototype was built to verify the effectiveness of the topology structure and control strategy.
关键词
零电压开关 /
零电流开关 /
DC-DC变换器 /
软开关（电力电子） /
分布式供电系统
Key words
zero voltage switching /
zero current switching /
DC-DC converter /
soft switching （power electronics） /
distributed power supply system
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