针对传统准Z源DC-DC变换器存在电压增益低和器件电压应力高的问题,提出一种高增益软开关准Z源DC-DC变换器（HGSS-QZS）。通过三绕组耦合电感匝比和开关管占空比共同调节,可提高升压能力和增益调节的自由度;并利用钳位电路吸收耦合电感的漏感能量,降低漏感引起的电压尖峰。首先详细分析HGSS-QZS变换器的工作原理,推导出电压增益、器件电压电流应力和效率损耗,其次进行参数设计并与现有变换器对比。表明HGSS-QZS变换器具有电压增益高、器件电压应力低、软开关和效率高的优点。最后搭建200 W实验样机,结合仿真与实验对比验证了HGSS-QZS变换器的有效性和可行性。
Abstract
To address the issues of low voltage gain and high voltage stress existing in traditional quasi-Z-source DC-DC converters, a high-gain soft-switching quasi-Z-source DC-DC converter （HGSS-QZS） is proposed. By adjusting both the turns ratio of the three-winding coupled inductor and the duty cycle of the switch, the boost capability and the flexibility of gain adjustment are improved. A clamping circuit is employed to absorb the leakage energy of the coupled inductor, reducing the voltage spikes caused by leakage inductance. Firstly, the operating principle of the HGSS-QZS converter is analyzed in detail, and voltage gain, device voltage and current stress, and efficiency losses are derived. Next, parameter design is carried out and compared with existing converters, demonstrating that the HGSS-QZS converter offers high voltage gain, low voltage stress on components, soft-switching capability, and high efficiency. Finally, a 200 W experimental prototype was built, and the validity and feasibility of the HGSS-QZS converter were verified through simulation and experimental comparison.
关键词
DC-DC变换器 /
准Z源 /
高增益 /
光伏发电 /
软开关 /
耦合电路 /
三绕组
Key words
DC-DC converters /
quasi-Z-source /
high gain /
PV power generation /
soft switching /
coupled circuits /
three-winding
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基金
国家自然科学基金（52177039）; 河南省科技攻关项目（242102241027）; 河南省高等学校重点科研项目（24A470006）
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