Patent ID: 8259475
Filing Date: 2012-09-04
Classification: H02M,Y02B

Abstract:
1. A power supply circuit having AC power discharging functions, the circuit comprising: a first rectifier rectifying AC power inputted from an AC power line; an electro-magnetic interference (EMI) removing unit installed between the AC power line and the first rectifier to suppress EMI of the AC power; a discharging signal generator generating a discharging signal from the AC power; and a discharging unit including a discharging resistor for discharging a voltage charged in the EMI removing unit according to the discharging signal wherein the discharging resistor is connected between an output terminal of the first rectifier and a ground, the discharging signal is generated from a ripple component of a rectified waveform, in which a magnitude of the AC power is reduced, and the discharging signal generator includes: a second rectifier generating the rectified waveform in which the magnitude of the AC power is reduced; a blocking capacitor allowing only an AC component of the rectified waveform to pass therethrough; and a third rectifier rectifying a ripple component of the AC component to generate the discharging signal.