Patent ID: 8564983
Filing Date: 2013-10-22
Classification: H02M

Abstract:
1. A power supply device, comprising: a transformer including a primary coil, a secondary coil, and a tertiary coil; a switching element connected via the primary coil to a direct-current power supply; a first rectifying-and-smoothing circuit rectifying and smoothing a voltage generated in the secondary coil and supplying the rectified and smoothed voltage to a load; a control circuit turning on and off the switching element; a second rectifying-and-smoothing circuit rectifying and smoothing a voltage generated in the third coil and thereby generating a driving voltage for driving the control circuit; and a starting circuit including wherein the second rectifying-and-smoothing circuit includes a second capacitor for supplying the driving voltage to the control circuit; and time for charging the first capacitor to the predetermined voltage is greater than time for charging the second capacitor to the driving voltage.