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SOFT SWITCH CONTROL CIRCUIT FOR BOOST PFC CONVERTER
SOFT SWITCH CONTROL CIRCUIT FOR BOOST PFC CONVERTER
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机译：升压PFC转换器的软开关控制电路
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摘要
A soft switch control circuit for a boost PFC converter. The boost PFC converter is a three-phase six-switch boost PFC converter, and comprises six main switch transistors (S1-S6) and an auxiliary switch transistor (S7). A control circuit (30) comprises a main switch control circuit (31) for outputting a drive signal for the main switch transistors (S1-S6) by means of a one cycle control algorithm, so as to drive two of the main switch transistors; and an auxiliary switch control circuit (32) for providing a reset signal to the main switch control circuit (31) to control the control of the main switch control circuit (31) over the main switch transistors (S1-S6). Moreover, the auxiliary switch control circuit (32) further outputs a drive signal for the auxiliary switch transistor (S7) to control the auxiliary switch transistor (S7). The main switch control circuit (31) comprises an interval selection circuit (311), an integrator circuit (312), a combination circuit (313), and a comparison circuit (314). Therefore, the costs can be reduced; in addition, easy control can be implemented, and the technology is easy to popularize.
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