鉴于传统Boost变换器结构电压抬升能力不足,提出一种基于耦合电感和倍压单元的二次型DC-DC变换器。该变换器将耦合电感与电压倍增单元组合,在中低占空比下具有较高的电压抬升能力。利用无源钳位电路吸收漏感产生的电压尖峰,减少能量损耗。双开关同步运行,控制简单,且共同承受电压应力,使得每个开关管电压应力较低。介绍该变换器的拓扑结构、工作原理、稳态分析。最后搭建一台200 W的实验样机,在0.4占空比下实现20倍电压增益,最高效率可达98.41%,证明变换器的可行性。
Abstract
Due to the insufficient voltage boosting capability of the basic Boost converter, a quadratic DC-DC converter based on coupled inductor and multiplier cell is proposed. The converter combines the coupled inductor with the voltage multiplier cell to achieve high voltage gain at low and medium duty cycles. The passive clamp circuit is used to absorb the voltage spike generated by the leakage inductance and reduce the energy loss. The two switches operate synchronously, the control is simple, and they share the voltage stress, so that the voltage stress on each switch is low. The topology, working principle and steady-state analysis of the converter are introduced. Finally, a 200 W experimental prototype is built, which achieves a voltage gain of 20 at 0.4 duty cycle and a maximum efficiency of 98.41%, proving the feasibility of the converter.
关键词
DC-DC变换器 /
耦合电路 /
光伏效应 /
变压器绕组 /
二次型 /
高增益
Key words
DC-DC converter /
coupled circuit /
photovoltaic effect /
transformer winding /
quadratic /
high gain
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基金
中央引导地方科技发展资金项目（科技成果转移转化项目)（236Z1910G）
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