INTELLIGENT PULSE CONTROL CIRCUIT

摘要

The instant disclosure provides an intelligent pulse control circuit used for a power supply. The intelligent pulse control circuit comprises a control unit, a buffer unit, a comparing unit and a switch unit. The buffer receives a loading signal. The comparing unit is coupled to the buffer unit, receives the loading signal generated according to the current of the output loading, and compares the loading signal and the feedback signal to generate a control signal. The switch unit is controlled by the control signal of the comparing unit to provide a turn-off signal. When the output loading is light load, the switch unit controls the control unit to disable the PFC stage and the PWM stage according to the turn-off signal. Accordingly, the intelligent pulse control circuit can reduce the power consumption when the output loading is light load.

主权项

1. An intelligent pulse control circuit used for a power supply, the power supply having a power factor correction stage and a pulse width modulation stage, the power factor correction stage coupled to the pulse-with modulation stage, the pulse width modulation stage generating a loading signal according to the current of an output loading, the voltage outputted from the power factor correction stage to the pulse width modulation stage being a feedback signal, the intelligent pulse control circuit comprising:
a control unit, coupled to the power factor correction stage and the pulse width modulation stage; a buffer unit, receiving the loading signal; a comparing unit, coupled to the buffer unit, receiving the loading signal through the buffer unit, and comparing the loading signal and the feedback signal to generate a control signal; and a switch unit, coupled to the comparing unit and the control unit, controlled by the control signal of the comparing unit to provide a turn-off signal, wherein when the output loading is light load, the switch unit controls the control unit to disable the power factor correction stage and the pulse width modulation stage according to the turn-off signal.