circuit for saving power consumption in standby state
First Claim
1. A circuit for saving power consumption during a standby state in a TV/VCR set, which has a monitor and provides programmed recording;
- said circuit including;
a power rectifying section for rectifying an ac voltage input to said TV/VCR to provide a dc voltage for providing the dc supply voltages to the component parts of the TV/VCR;
a transformer having a primary and a secondary side;
a switching section having the output dc voltage from said rectifying section applied thereto for supplying a switched voltage to the primary of said transformer to induce a switched voltage into the secondary side of said transformer, the switching time of said switching section being controlled by a feedback signal supplied thereto;
a secondary rectifying section for rectifying and smoothing the voltage induced in the secondary side of said transformer;
a feedback section connected to said secondary rectifying section for providing said feedback signal to said switching section to control the switching thereof and concomitantly to control the voltage induced into said secondary;
a reference voltage detection control section connected to said secondary rectifying section for adjusting said feedback signal of said feedback section by comparing the output voltage of said secondary rectifying section with a reference voltage;
a microprocessor for sensing the power conditions of said TV/VCR set and providing voltage control signals of high/low type at output ports thereof depending upon the power state of said TV/VCR set;
a monitor power control section connected to said secondary rectifying section, said microprocessor, and said monitor for controlling the supply of a voltage to said monitor such that the voltage supply to said monitor is cut off during a turn-off of the monitor, during a standby state, and during a programmed recording; and
a standby state power control section connected to said monitor and said feedback section for causing said feedback section to vary said feedback signal to result in the forcible reduction of the voltage induced in said secondary.
1 Assignment
0 Petitions
Accused Products
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.
31 Citations
5 Claims
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1. A circuit for saving power consumption during a standby state in a TV/VCR set, which has a monitor and provides programmed recording;
- said circuit including;
a power rectifying section for rectifying an ac voltage input to said TV/VCR to provide a dc voltage for providing the dc supply voltages to the component parts of the TV/VCR; a transformer having a primary and a secondary side; a switching section having the output dc voltage from said rectifying section applied thereto for supplying a switched voltage to the primary of said transformer to induce a switched voltage into the secondary side of said transformer, the switching time of said switching section being controlled by a feedback signal supplied thereto; a secondary rectifying section for rectifying and smoothing the voltage induced in the secondary side of said transformer; a feedback section connected to said secondary rectifying section for providing said feedback signal to said switching section to control the switching thereof and concomitantly to control the voltage induced into said secondary; a reference voltage detection control section connected to said secondary rectifying section for adjusting said feedback signal of said feedback section by comparing the output voltage of said secondary rectifying section with a reference voltage; a microprocessor for sensing the power conditions of said TV/VCR set and providing voltage control signals of high/low type at output ports thereof depending upon the power state of said TV/VCR set; a monitor power control section connected to said secondary rectifying section, said microprocessor, and said monitor for controlling the supply of a voltage to said monitor such that the voltage supply to said monitor is cut off during a turn-off of the monitor, during a standby state, and during a programmed recording; and a standby state power control section connected to said monitor and said feedback section for causing said feedback section to vary said feedback signal to result in the forcible reduction of the voltage induced in said secondary. - View Dependent Claims (2, 3, 4, 5)
- said circuit including;
Specification