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Zero-Voltage-Switching PWM Resonant Full-Bridge Converter With Minimized Circulating Losses and Minimal Voltage Stresses of Bridge Rectifiers for Electric Vehicle Battery Chargers

机译:零电压开关PWM谐振全桥转换器,用于电动汽车电池充电器的桥式整流器具有最小的循环损耗和最小的电压应力

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This paper presents a zero-voltage-switching (ZVS) full-bridge dc–dc converter combing resonant and pulse-width-modulation (PWM) power conversions for electric vehicle battery chargers. In the proposed converter, a half-bridge LLC resonant circuit shares the lagging leg with a phase-shift full-bridge (PSFB) dc–dc circuit to guarantee ZVS of the lagging-leg switches from zero to full load. A secondary-side hybrid-switching circuit, which is formed by the leakage inductance, output inductor of the PSFB dc–dc circuit, a small additional resonant capacitor, and two additional diodes, is integrated at the secondary side of the PSFB dc–dc circuit. With the clamp path of a hybrid-switching circuit, the voltage overshoots that arise during the turn off of the rectifier diodes are eliminated and the voltage of bridge rectifier is clamped to the minimal achievable value, which is equal to secondary-reflected input voltage of the transformer. The sum of the output voltage of LLC resonant circuit and the resonant capacitor voltage of the hybrid-switching circuit is applied between the bridge rectifier and the output inductor of the PSFB dc–dc circuit during the freewheeling phases. As a result, the primary-side circulating current of the PSFB dc–dc circuit is instantly reset to zero, achieving minimized circulating losses. The effectiveness of the proposed converter was experimentally verified using a 4-kW prototype circuit. The experimental results show 98.6% peak efficiency and high efficiency over wide load and output voltage ranges.
机译:本文提出了一种零电压开关(ZVS)全桥DC-DC转换器,该转换器结合了用于电动汽车电池充电器的谐振和脉宽调制(PWM)功率转换。在拟议的转换器中,半桥LLC谐振电路与相移全桥(PSFB)dc-dc电路共享滞后桥臂,以确保滞后桥臂开关的ZVS从零到满负载。 PSFB dc-dc的次级侧集成了一个次级侧混合开关电路,该电路由泄漏电感,PSFB dc-dc电路的输出电感器,一个小的附加谐振电容器和两个附加二极管组成。电路。通过混合开关电路的钳位路径,消除了在整流二极管关断期间出现的电压过冲,并将桥式整流器的电压钳位到了可实现的最小值,该值等于二次侧输入电压变压器。在续流阶段,LLC谐振电路的输出电压与混合开关电路的谐振电容器电压之和施加在桥式整流器和PSFB dc-dc电路的输出电感器之间。结果,PSFB dc-dc电路的初级侧循环电流立即重置为零,从而将循环损耗降至最低。提出的转换器的有效性已通过4kW原型电路进行了实验验证。实验结果表明,在宽负载和输出电压范围内,峰值效率和高效率达到98.6%。

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