Practical circuit diagram that enables remote wake-up/shutdown

Computer remote wake-up can remotely start the computer through the network card. Remote assistance is a very useful network function. What we are introducing now is a practical circuit diagram that realizes synchronization between the host and one or several controlled devices to complete remote wake-up and shutdown. The circuit uses a 220 volt AC circuit application as an example. In the main control circuit, after the power socket x1 is connected to the load and the power is turned on, current flows through the bridge rectifier D, resulting in an AC voltage drop of approximately 1.2 volts or more. At the same time, the current is limited by resistors R1, R2 and R3, R4. During the positive half cycle and negative half cycle of the AC power supply, current flows through the optocoupler G1 and G2 in turn, and the voltage is limited to about 1.2 volts to protect the optocoupler. After the phototransistors of G1 and G2 are turned on, through long-distance wire transmission, the circuit composed of G3 is controlled, and the relay J1 is controlled to start. The normally open contact J1-1 of the relay J1 is closed to control the electrical appliances that need to be turned on synchronously. Normally closed contact J1-2 is disconnected to control electrical appliances that need to be disconnected synchronously. Since the circuit uses two photocouplers and capacitors C1 and C2, it can effectively prevent relay jitter. In a circuit that requires delayed closing and delayed opening, increasing the capacity of C1 and C2 can easily achieve the effects of delayed closing and opening. Diode D1 absorbs the self-induced electromotive force generated by the J1 coil to protect G3 from working safely. The parts within the dotted box can be installed in multiple units and used in parallel as needed. The circuit in this article can be used in AC or DC circuits to effectively remotely control the turning on or off of remote electrical equipment. As shown below.