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Two-stage single phase bi-directional PWM power converter with DC link capacitor reduction
Two-stage single phase bi-directional PWM power converter with DC link capacitor reduction
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机译:具有直流母线电容减小功能的两级单相双向PWM功率转换器
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摘要
DC link capacitance in a bi-directional AC/DC power converter using a full-bridge or H-bridge switching circuit can be greatly reduced and the power density of the power converter correspondingly increased by inclusion of a bi-directional synchronous rectifier (SR) DC/DC converter as a second stage of the power converter and controlling the second stage with a control loop having a transfer function common to both buck and boost modes of operation of the bi-directional SR DC/DC converter and a resonant transfer function to increase gain at the ripple voltage frequency (twice the AC line frequency) to control the duty cycle of the switches of the bi-directional SR DC/DC stage and controlling the duty cycle of the switches of the full-bridge or H-bridge switching circuit using a control loop including a notch filter at the ripple voltage frequency.
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机译:通过包含双向同步整流器(SR),可以大大降低使用全桥或H桥开关电路的双向AC / DC电源转换器中的直流链路电容,并相应地提高电源转换器的功率密度DC / DC转换器,作为功率转换器的第二级,并通过控制回路控制第二级,该控制回路具有双向SR DC / DC转换器的降压和升压工作模式共有的传递函数,并具有谐振传递函数。在纹波电压频率(交流电源频率的两倍)处增加增益,以控制双向SR DC / DC级开关的占空比,并控制全桥或H桥开关的开关占空比使用控制回路的电路,该控制回路包括在纹波电压频率处的陷波滤波器。
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