TV power saving remote shutdown circuit

Single chip microcomputer STM32L151CCU6

As shown in the figure, the TV power-saving remote shutdown circuit. The circuit is composed of a power supply circuit, an infrared receiving circuit, a music integrated circuit IC (CIC2851), and the like.

When the handheld remote controller sends a signal to the television, the phototransistor BG1 in the circuit receives this signal. This signal is a pulse modulated signal with a small average power. After the signal is amplified by the BG2 tube, the IC is triggered to emit an audio signal. The audio signal is rectified by D5 and D6 to generate a bias current, so that the BG5 is turned on and the relay J is pulled, thereby turning on the power of the television. The alternating current generated by the alternating current through the secondary of the transformer B replaces the audio signal of the IC, and the relay J is self-locked.

To shut down, BG1 receives the optical signal again, which generates a small collector current. After the signal is amplified by BG2, the BG3 tube is turned on, and the trigger IC sends a shutdown signal. Since the current of the whole TV is greatly reduced, the secondary AC voltage of B drops, and after 10 seconds, the music integrated circuit IC stops outputting, and the collector current corresponding to the BG5 tube is reduced, so that the relay J is released, thereby disconnecting the power of the television. .