Importance

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Abstract

A synchronous rectification drive method and drive circuit for totem pole PFC are provided. The drive method includes: in a positive half-cycle, providing a first pulse width modulation (PWM) signal to the second switching transistor, switching on the fourth switching transistor, switching off the first and the third switching transistor first, and when a sampling voltage is greater than a predetermined first voltage, providing a second PWM signal to the first switching transistor, where the second PWM signal is opposite to the first PWM signal; and in a negative half-cycle, providing a third PWM signal to the first switching transistor, switching on the third switching transistor, switching off the second and the fourth switching transistor first, and when the sampling voltage is less than a predetermined second voltage, providing a fourth PWM signal to the second switching transistor, where the fourth PWM signal is opposite to the third PWM signal.

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First Claim