Patent ID: 8965236
Filing Date: 2015-02-24
Classification: G03G,H02M,H04N

Abstract:
1. A power supply system comprising: a first capacitor including a first electrode and a second electrode, the first electrode being connected to one end of an alternating current power supply; a second capacitor including a first electrode and a second electrode, the first electrode being connected to the other end of the alternating current power supply; a rectification circuit that is electrically connected between the second electrode of the first capacitor and the second electrode of the second capacitor and is configured to rectify an alternating current voltage applied to the first and second capacitors; a signal generation circuit that is connected to an output line of the rectification circuit and is configured to generate a detection signal corresponding to a zero cross point of an alternating current output of the alternating current power supply, based on an output of the rectification circuit; an electricity storage unit that is connected to the output line of the rectification circuit at a more downstream position than the signal generation circuit; a backflow regulation element that is provided on the output line of the rectification circuit and is configured to regulate backflow of current from the electricity storage unit towards the signal generation circuit; a current limit element configured to limit current flowing from the output line of the rectification circuit towards the electricity storage unit, and a control unit that is connected to the output line of the rectification circuit, and is configured to detect a zero cross point of the alternating current output, based on the detection signal.