Patent ID: 8441237
Filing Date: 2013-05-14
Classification: H02M,Y02B

Abstract:
1. A circuit comprising: a power factor correction stage having a DC input, a ground input, a DC output and a ground output; a capacitor; a diode; and discharge means; wherein a first terminal of the diode connected to an input of the power factor correction stage, a second terminal of the diode is connected to the first plate of the capacitor, and the second plate of the capacitor is connected to the other input of the PFC stage; the discharge means is connected to the capacitor and is configured to discharge the capacitor such that it contributes to the output of the PFC stage when the level of a signal at the input of the PFC stage falls below a threshold value; the circuit further comprising: a charge pump diode; and a charge pump capacitor; wherein a first terminal of the charge pump diode is connected to the diode, or first and second diodes, and a second terminal of the charge pump diode is connected to the first plate of the capacitor, and a first plate of the charge pump capacitor is connected to the first terminal of the charge pump diode, and a second plate of the charge pump capacitor is connected to the discharge means.