High voltage protection circuit for a television receiver

Details High voltage protection circuit for a television receiver High voltage protection circuit for a television receiver

1981-01-16

1982-08-17

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 568

Patent

active

043452752

ABSTRACT:
A high voltage generator of a television receiver is responsive to an alternating voltage, such as a retrace pulse voltage, and develops an ultor voltage at an ultor terminal. A high voltage protection circuit includes a comparator that, when activated, disables normal television display. A sense voltage representative of the ultor voltage is coupled to an input terminal of the comparator so as to activate the comparator when the ultor voltage exceeds a predetermined threshold level. A sense voltage representative of the ultor beam current is also coupled to an input terminal of the comparator so as to vary the threshold ultor voltage level at which the comparator is activated in accordance with beam current variations. When the ultor beam current exceeds a level indicative of high voltage generator overload, a switch that is coupled to an input terminal of the comparator changes states to activate the comparator and shut down the high voltage generator.

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Hitachi, CU-150 Solid State Color Televsion Service Manual No. 344, CQ3DX Chassis, pg. 1-9 & Electrical Schematic, Oct. 1976.
RCA Corp. Training Manual WS21, "CTC 108 Television Workshop, Servicing the CTC 108 XL-100 Color Chassis", pp. 1, 3, 48 & 49, Copyright 1980.
RCA Television Service Data, File 1980 C-5, Chassis CTS 108 Series, Copyright 1980.
Electrical Schematic, Magnavox T989 Color Television Chassis, Manual No. 7343, Section 4.1, Fourth Issue: Mar. 1975.

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