Capacitor discharging circuit and converter

摘要

A capacitor discharging circuit and a converter are disclosed. The converter comprises: a capacitor connected between the live line and null line of an AC power input terminals, a conversion module coupled to the capacitor and comprising an energy storage component at least, an energy transfer unit coupled with the energy storage component and the capacitor, an AC power-off detecting unit and a control unit; wherein the energy transfer unit comprises a switch device; when AC power is disconnected, the AC power-off signal triggers the control unit to output a switch driving signal, controlling the operation of the energy transfer unit to transfer the energy stored in the capacitor to the energy storage component to discharge the capacitor.

主权项

1. A converter, comprising:
a capacitor connected between a live line and a null line of AC power input terminals; a conversion module coupled to the capacitor and at least comprising an energy transfer unit and an energy storage component, wherein, the energy transfer unit, comprising a switching device, is coupled to the capacitor and the energy storage component; an AC power-off detecting unit connected with the AC power input terminals, which detects on-off status of AC power and generates an AC power-off signal; and a control unit coupled to the AC power-off detecting unit; wherein when disconnection of the AC power is detected by the AC power-off detecting unit, the AC power-off signal outputted from the AC power-off detecting unit triggers the control unit to output a switch driving signal, which controls operation of the energy transfer unit to transfer energy stored in the capacitor to the energy storage component, so that the capacitor is discharged; wherein the control unit comprises an intervention unit, a feedback regulation unit and a switching signal generation unit, wherein, the feedback regulation unit comprises a feedback voltage sampling unit, a reference voltage generation unit and a regulation unit; when the AC power is disconnected, the intervention unit intervenes to increase output voltage of the feedback regulation unit by decreasing feedback voltage received by the feedback regulation unit or increasing output voltage of the reference voltage generation unit, such that the switching signal generation unit generates a switch driving signal according to the output voltage of the feedback regulation unit, so as to control the operation of the switching device of the conversion module to transfer the energy stored in the capacitor to the energy storage component of the conversion module, and to discharge the capacitor.