Patent ID: 6104174
Filing Date: 2000-08-15
Classification: H04N

Abstract:
A high voltage power supply circuit for supplying a high voltage to an anode of a cathode ray tube, said high voltage power supply circuit comprising:a flyback transformer for boosting a flyback pulse to generate a high output voltage and to supply the high output voltage to the anode of said cathode ray tube;a resonance power supply circuit, having a main switching element and a resonance capacitor, for generating said flyback pulse in such a manner that a series resonance of said resonance capacitor and a primary winding of said flyback transformer is generated on a basis of a switching operation of said main switching element;a high voltage detection circuit for detecting the high output voltage boosted by said flyback transformer;a high voltage stabilizing circuit for stabilizing the high output voltage in such a manner that a peak value of the flyback pulse generated by said resonance power supply circuit is varied on a basis of the high voltage detected value detected by said high voltage detection circuit; anda rising voltage speed-up circuit for forcedly decreasing the detected voltage fed back from said high voltage detection circuit to said high voltage stabilizing circuit relative to a setting voltage of said high voltage stabilizing circuit during a predetermined period from turning-on of a power supply switch.