Patent ID: 8497663
Filing Date: 2013-07-30
Classification: H02J,H02M

Abstract:
1. A charging device for providing an output voltage to charge a flash capacitor, comprising: a transformer, comprising a primary winding and a secondary winding, wherein the transformer generates a primary voltage at the primary winding according to an input voltage and generates a secondary voltage at the secondary winding according to the primary voltage; a diode coupled between the secondary winding of the transformer and the flash capacitor, providing the output voltage according to the secondary voltage; a current detector, detecting a current flowing through the primary winding of the transformer to generate a detection signal; a switch coupled between the primary winding of the transformer and a ground; a determining circuit, generating a determining signal according to the primary voltage, the secondary voltage and a reference voltage; and a control circuit, switching the switch according to the detection signal and the determining signal, so as to control the transformer to charge the flash capacitor.