circuit for saving power consumption in standby state

Details circuit for saving power consumption in standby state circuit for saving power consumption in standby state

1994-11-30

1995-12-19

Kostak, Victor R.

Television

Receiver circuitry

Power supply

358335, H04N 544

Patent

active

054772796

ABSTRACT:
A circuit for saving power consumption in a TV/VCR set reduces the voltage induced into the secondary of a transformer when the set is in standby, when the monitor is off and when a programmed recording operation takes place. The circuit includes a power rectifying section for rectifying the voltage input from an electrical outlet, a switching section for causing the output of the power rectifying section to be induced into the secondary side of a transformer with the switching time of the switching section being controlled by the feedback of the output power from the secondary of the transformer, a secondary rectifying section for rectifying and smoothing the voltage induced in the secondary side of the transformer, a feedback section for feeding back the output voltage of the secondary rectifying section to the switching section, and a reference voltage detection control section for adjusting the feedback amount of the feedback section by comparing the output voltage of the secondary rectifying section with a reference voltage. The circuit further include a microprocessor for outputting high or low signals in accordance with the state of the TV/VCR set, a monitor power control section for controlling the supply of voltage from the secondary rectifying section to a horizontal oscillating voltage terminal of a monitor of the set under the control of the microprocessor during a state when the monitor is turned off, a standby state or a programmed recording, and a standby state power control section controlling the feedback amount of the feedback section by forcibly dropping the output voltage of the secondary side under the control of the microprocessor during a standby state.

REFERENCES:
patent: 4802290 (1989-08-01), Jung et al.
patent: 5189600 (1993-02-01), Keck et al.
patent: 5270823 (1993-12-01), Heidebroek et al.

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