Control system and method for improving pf of isolated three-level pfc converter
A converter and three-level technology, applied in control/regulation systems, high-efficiency power electronic conversion, and regulation of electrical variables, etc., can solve the problems of complex digital control methods and difficult implementation, and achieve good real-time performance, improved efficiency, and control The effect of simple method
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[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0031] 1. The working principle of the PFC stage of the isolated three-level PFC converter when it works in the inductor current discontinuous mode
[0032] The main circuit of the isolated three-level PFC converter of the present invention is as figure 1 As shown, the PFC stage with input current shaping function and the DC / DC stage with output voltage regulation function share the switch tube Q 2 and Q 3 , so it is a typical single-stage PFC converter. When the switching frequency of the switching tube is constant and the PFC stage of the converter under the control of the constant on-duty ratio works in the inductor current discontinuous mode (Discontinue Current Mode, DCM), the peak value of the inductor current is basically proportional to the input voltage, that is, the input current Automatically track the input voltage wave...
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