Standby/run power supply and control circuit

Details Standby/run power supply and control circuit Standby/run power supply and control circuit

H - Electricity

04

N

350/109

H04N 5/63 (2006.01)

Patent

CA 2022573

A standby/run power supply and control circuit for a television apparatus comprises first and second sources of DC voltage. The first is unswitched and available during a standby mode of operation, and the second 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 is 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. 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.

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