Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1981-01-21
1982-08-03
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
315411, 328 9, 358190, 358243, 361 79, 361 88, H02H 320
Patent
active
043430287
ABSTRACT:
A high voltage generator of a television display is responsive to an alternating voltage, such as a retrace pulse voltage, for developing an ultor voltage at an ultor terminal. A protection circuit for the high voltage generator includes a comparator that develops a television display disabling signal when activated. A circuit that develops a sense voltage representative of the ultor voltage is coupled to an input terminal of the comparator so as to develop the disabling signal when the ultor voltage exceeds a predetermined level. To provide an overload disabling capability, an ultor beam current sensing circuit is coupled to the input terminal of an operational amplifier. The output terminal of the amplifier is coupled to a bias voltage source and to an input terminal of the comparator. When the ultor beam current exceeds a predetermined level indicative of high voltage generator overload operation, the operational amplifier applies the bias voltage to the comparator input to energize the comparator into developing the disabling signal. The magnitude of the bias voltage is such as to activate the comparator in substantial independence of the value of the ultor voltage sense voltage.
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RCA Television Service Data, File 1980 C-2, Chassis CTC107 Series, pp. 1, 13, 14, 24-29, & Electrical Schematic, Copyright 1980.
Hitachi CU-150 Solid State Color Television Service Manual No. 344, CQ3DX Chassis, pp. 1-9, & Electrical Schematic, Oct. 1976.
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Eisenzopf Reinhard J.
Laks J. J.
Meise W. H.
Rasmussen P. J.
RCA Corporation
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