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Power Factor Correction Stage Control During Start-up For Efficient Use Of A Negative Temperature Coefficient Thermistor
Power Factor Correction Stage Control During Start-up For Efficient Use Of A Negative Temperature Coefficient Thermistor
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机译:有效使用负温度系数热敏电阻的启动过程中的功率因数校正级控制
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摘要
A power factor correction (PFC) stage of a power supply unit has a PFC circuit including a rectifier circuit, a PFC controller circuit with a PFC switch, a current sensor connected to the PFC switch, a high frequency bypass capacitor connected between the PFC controller circuit and the rectifier circuit, and a bulk storage capacitor connected between the PFC controller circuit and an output of the PFC stage. The PFC stage also has a negative temperature coefficient thermistor connected in series with the PFC switch and the current sensor. During a start-up of the power supply unit, the PFC controller circuit causes the PFC switch to turn-on until the PFC controller circuit causes the PFC switch to turn-off after a current through the current sensor is sensed as being equal to or greater than a preset value.
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