This paper deals with an improved battery charger for electric vehicle (EV) based on bridgeless (BL) isolated Zeta-Luo converter with built-in power factor (PF) pre-regulations capability at supply side. This configuration is achieved with combined Zeta and Luo converter, which are designed to work during individual halves of supply voltage. This gives the additional benefits of higher efficiency than the previously developed converters on the account of sharing the output inductors for both the converters. Moreover, a uniform charging current is obtained for the battery due to presence of output inductance in both converters, as compared to Zeta or Luo converter used for both cycles. A prototype is implemented to investigate the improved power (PQ) based performance of proposed isolated BL PFC converter at steady state and for wide range of varying line voltages. Test results of proposed charger are found satisfactory to show the improved PF based charging in constant current (CC) and constant voltage (CV) modes. The PQ indices at supply side, conform the recommended IEC 61000-3-2 guidelines for all the operating conditions.

中文翻译：

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基于无桥隔离 Zeta-Luo 转换器的具有 PF 预调节的电动汽车充电器

本文讨论了一种改进的电动汽车 (EV) 电池充电器，该充电器基于无桥 (BL) 隔离式 Zeta-Luo 转换器，在电源侧具有内置功率因数 (PF) 预调节能力。这种配置是通过组合 Zeta 和 Luo 转换器实现的，它们设计用于在单独的一半电源电压期间工作。由于共享两个转换器的输出电感器，这提供了比先前开发的转换器更高效率的额外好处。此外，与用于两个循环的 Zeta 或 Luo 转换器相比，由于两个转换器中都存在输出电感，因此为电池获得了均匀的充电电流。实施原型以研究所提出的隔离式 BL PFC 转换器在稳定状态和宽范围变化的线电压下的基于改进的功率 (PQ) 性能。建议充电器的测试结果令人满意，表明在恒流 (CC) 和恒压 (CV) 模式下基于 PF 的充电得到了改进。供应侧的 PQ 指标符合所有操作条件下推荐的 IEC 61000-3-2 指南。