TV power saving circuit

The color TV energy-saving circuit introduced in this example reduces the standby power consumption to o when the TV is on standby. 5-1W. The energy saving effect is significant.
  (1) Circuit composition The color TV standby energy saver circuit is composed of a power supply circuit, an infrared receiving control circuit and a current detection control circuit.
    The power supply circuit is composed of a power transformer T, a rectifier bridge stack UR, a filter capacitor C5, G and a three-terminal voltage stabilizing integrated circuit. IC 2 composition.
    The infrared receiving circuit is composed of infrared receiving head IC3, double D trigger integrated circuit IC4a, resistor Rs-R7, capacitor Cz, G, diode
VD1 and light-emitting diode I.ED.
    The current detection circuit consists of resistors Ri-Rt, Ra-Rio, capacitors Cl, C4, diodes VD2~VD5, transistor VT, and relay
K. It is composed of optocoupler VLC, YMIT inverter integrated circuit IC1 and IC4b, etc.
    (2) Circuit principle When the standby button of the TV remote control is pressed, the TV enters the standby state. At this time, due to the reduction of the load
  current (that is, the voltage drop of R,. is reduced), the conduction ability of the internal light-emitting diode and phototransistor of TVP is weakened, causing the ④ pin of IC1 to output
  a high level, through C4 Reset IC4b, and pin ① of IC4 changes to low level. VT is cut off, K is released, and the working power of the TV is
  cut off. At this time, the @ pin of IC 4 is low level, the @ pin outputs high level, and the LED lights up.