circuit for saving power consumption in standby state

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.