High voltage power supply circuit

Details High voltage power supply circuit High voltage power supply circuit

1999-04-21

2000-08-15

Riley, Shawn

Electricity: power supply or regulation systems

Output level responsive

Zero switching

315411, G05F 110

Patent

active

061041742

ABSTRACT:
A speed-up circuit 10 is connected to a detection line 6 for feeding back the high voltage detection value of a high voltage detection circuit 5 to a high voltage stabilizing circuit 1. When a power supply switch is turned on, since a PNP transistor 12 of the speed-up circuit 10 is turned on, a resistor 11 is connected to the detection line 6, so that the high voltage detection value is reduced forcedly. Accordingly, the high voltage stabilizing circuit 1 increases the peak value of a flyback pulse generated by a resonance-type power supply circuit 2 to output higher high voltage thereby to shorten the rising time of the high voltage output supplied to the anode of a CRT. After the lapse of the predetermined time from the turning-on of the power supply switch, since the terminal voltage of a capacitor 13 having been charged through a resistor 14 exceeds almost the voltage at a point A, the PNP transistor 12 is turned off, so that the resistor 11 is separeted from the detection line. Accordingly, the responsibility of the flyback pulse is prevented from being degraded at the time of the abrupt change of the load of the CRT.

REFERENCES:
patent: 3795835 (1974-03-01), Aldrich et al.
patent: 4090111 (1978-05-01), Suzuki

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