Electric lamp and discharge devices: systems – Cathode ray tube circuits – Power supply from deflection circuit source
Patent
1989-08-11
1991-07-30
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Power supply from deflection circuit source
358190, H01J 2970, H04N 563
Patent
active
050362615
ABSTRACT:
A standby/run power supply and control circuit for a television apparatus comprises first and second sources of DC voltage, one of which is unswitched and available during a standby mode of operation and the other one of which is switched and available only during a run mode operation. A voltage regulator has an input coupled to both DC sources and has an output for supplying a regulated DC voltage at a first power level during the standby mode and at a second power level during the run mode. A first control circuit, such as a CMOS integrated circuit, is coupled to the regulated voltage output and operable in both the standby and run modes. A second control circuit, such as a second CMOS integrated circuit, is interconnected with the first control circuit, for example by a common control bus. The second control circuit is also coupled to the regulated voltage output, but is operable only during the run mode. The first control circuit is energized by the first source in the standby mode and both the first and second control circuits are energized by the second source at a common voltage level in the run mode. Interconnected CMOS integrated circuits, some active in standby and run, and some active in run only, operate without risk of SCR latching. Reliance on standby power during the run mode is minimized. The time during which power is available to a microprocessor for effecting controlled shutdown during AC power interruption is maximized.
REFERENCES:
patent: 4680511 (1987-07-01), Fitzgerald et al.
patent: 4737851 (1988-04-01), Shanley, II et al.
RCA/GE Color Television Service Data CTC 148/149, Thomson Consumer Electronics, Inc. pp. 2-3, Apr. 1989, Deflection and Power Supply Schematic (Cold Chassis).
Fried Harvey D.
Issing Gregory C.
Laks Joseph L.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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