Patent ID: 7411374

Claim:
A capacitor charging circuit for charging a capacitive load, said capacitor charging circuit comprising: a power transfer circuitry comprising a transformer for transferring power from a power source to said capacitive load; a power switching control circuitry for controlling switching of said power source to said power transfer circuitry and for delivering said power to said power transfer circuitry for a constant ON-time; a discontinuous conduction mode (DCM) detection circuitry coupled to said transformer and for generating a discontinuous conduction mode (DCM) signal indicative of an occurrence of a discontinuous conduction mode in said transformer; an overcurrent protection (OCP) circuitry coupled to said transformer and for generating an overcurrent signal indicative of an overcurrent condition in said transformer; a constant ON-time generator circuitry for receiving said DCM signal and said overcurrent signal and for generating said constant ON-time according to said DCM signal and said overcurrent signal; and a voltage measurement circuitry for measuring an output voltage of said power transfer circuitry to determine when to stop charging said capacitive load.