车载充电PWM软开关DC-DC变换器研究综述

摘要

DC-DC converter is the crucial part that directly affects the operation efficiency of on-board charger. In recent years, researches on PWM soft-switching DC-DC converters have been carried out, and quite a few achievements have been proposed to realize the high-efficiency operation of DC-DC converters during the entire battery charging period. In this paper, the general requirements for DC-DC converter of on-board chargers are specified, and several inherent shortages of conventional primary-side phase-shift full-bridge DC-DC converter are firstly analyzed. Then the research status on PWM soft-switching DC-DC converter of on-board charger is thoroughly reviewed based on the main circuit topologies, gating schemes and control strategies. Finally, the pros and cons of the existing technique schemes are discussed, and future works are pointed out to realize the overall efficiency improvement of DC-DC converters.%作为车载充电机的关键部分,DC-DC变换器直接影响其运行效率,近年来,众多学者围绕PWM软开关DC-DC变换器开展研究并已取得可供借鉴的研究成果,旨在实现DC-DC变换器在整个充电过程中的高效运行.针对车载充电系统,首先指出DC-DC变换器设计要求,并分析传统原边移相控制全桥DC-DC变换器固有的不足,再从主电路拓扑、驱动方式和控制策略三个方面,详述车载充电机中PWM软开关DC-DC变换器研究进展.最后,剖析现有PWM软开关DC-DC变换器技术方案的优势与不足,并指出未来工作方向以实现DC-DC变换器系统效率全面提升.