Secondary-Side Phase-Shift-Controlled ZVS DC/DC Converter With Wide Voltage Gain for High Input Voltage Applications
Secondary-Side Phase-Shift-Controlled ZVS DC/DC Converter With Wide Voltage Gain for High Input Voltage Applications
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DOI：
10.1109/tpel.2013.2242490
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发表时间：
2013-02
影响因子：
6.7
通讯作者：
Wuhua Li;Sheng Zong;Fangrui Liu;Huan Yang;Xiangning He;Bin Wu
中科院分区：
文献类型：
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作者：
Wuhua Li;Sheng Zong;Fangrui Liu;Huan Yang;Xiangning He;Bin Wu
本文提出了一种采用二次侧移相控制策略的软开关DC/DC转换器，以提高DC/DC转换器在高输入电压下的转换效率和减小一次开关电压应力。在较宽的负载范围内，一次侧功率器件和二次侧功率器件均实现了零电压开关，以减小二次侧移相控制方案带来的开关损耗。此外，与传统的移相控制机制相比，还有效地抑制了续流阶段的环流，最大限度地减少了导通损耗。此外，采用改进的三电平结构，一次开关的电压应力仅为输入电压的一半，使得低压额定功率器件能够提高电路性能。此外，该转换器可以工作在降压、平衡和升压模式下，以获得相对较宽的输入电压范围，这是通信电源系统在保持时间可接受的情况下最小化电解电容器的预期优势。分析了该变流器的工作原理，并给出了1 kW 100 kHz样机的实验结果，验证了该变流器的有效性和优越性。
In this paper, a soft-switching dc/dc converter with secondary-side phase-shift control strategy is proposed to improve the conversion efficiency and minimize the primary switch voltage stress in the high input voltage applications. Zero-voltage-switching performance is achieved for both the primary- and secondary-side power devices in a wide load range to reduce the switching losses due to the secondary-side phase-shift control scheme. Furthermore, compared with the conventional phase-shift control mechanism, the circulating current at the freewheeling stage is effectively suppressed as well to minimize the conduction losses. Moreover, the voltage stress of the primary switches is only half of the input voltage by employing the improved three-level structure, which makes the low-voltage rated power devices available to improve the circuit performance. In addition, the converter can work in the buck, balance, and boost modes to achieve a relatively wide input voltage range, which is an expected advantage for the communication power system to minimize the electrolytic capacitors with an acceptable hold-up time. The operation principle is analyzed and experimental results of a 1-kW 100-kHz prototype are provided to verify the effectiveness and the advantages of the proposed converter.