Output overvoltage protection for a totem pole power factor correction circuit
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United States of America Patent
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Jun 4, 2024
Grant Date -
Oct 27, 2022
app pub date -
Apr 14, 2022
filing date -
Apr 14, 2022
priority date (Note) -
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status (Latency Note)
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Abstract
During a light load (or no-load) operation of a totem pole power factor correction circuit (i.e., PFC), a pulse width modulation (PWM) controller can operate in a skip mode. Further, the PWM controller may disable portions of the PFC to reduce standby power consumption. In this mode, and in this disabled configuration, the output of the PFC may be peak charged over time to a voltage that could be damaging or destructive. This peak charging results from the PFC circuit's inability to fully charge/discharge EMI capacitors between half cycles of the input line voltage. The present disclosure provides circuits and methods to fully charge/discharge the EMI capacitors to prevent peak charging the output.
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