CRT power supply apparatus having synchronized high and low volt

Details CRT power supply apparatus having synchronized high and low volt CRT power supply apparatus having synchronized high and low volt

1991-12-23

1992-11-03

Stephan, Steven L.

Electric power conversion systems

Current conversion

Having plural converters for single conversion

363 21, 315408, 315411, 358190, H01J 2970

Patent

active

051612410

ABSTRACT:
A power supply circuit for a CRT display device includes a low-voltage power supply switching circuit for supplying power to a horizontal oscillation circuit of the CRT display device, and a high-voltage power supply switching circuit for supplying power to high-voltage circuits of the CRT display device. The low-voltage power supply switching circuit includes an oscillator and a switching transistor. The oscillator is triggered by an output of the horizontal oscillation circuit, and the conductive state of the switching transistor is controlled according to an output of the oscillator. The high-voltage power supply switching circuit includes a switching transistor. The conductive state of the switching transistor of the high-voltage power supply switching circuit is controlled according to an output of the low-voltage power supply switching circuit. As such, the switching operations of the low-voltage and high-voltage power supply switching circuits is carried out at a same frequency and in synchronism with the output of the horizontal oscillation circuit.

REFERENCES:
patent: 4115814 (1978-09-01), Kosaka et al.
patent: 4118739 (1978-10-01), Umehara
patent: 4215296 (1980-07-01), Mitamura et al.
patent: 4489253 (1984-12-01), Godawski
patent: 4761723 (1988-08-01), Lendaro
patent: 4812719 (1989-03-01), Stephens et al.
patent: 5013980 (1991-05-01), Stephens et al.

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