Simple environmentally friendly lighting delay control circuit

Special offer 0603 red light LED quality assurance

In order to facilitate the passage of the corridor and save electricity, here is a delay lighting control circuit for the corridor lighting. A lighting and a button are respectively arranged between each floor. When people go up and down the stairs, just press any one of the buttons. The corridor lights are all lit, and when you pass the corridor, they will automatically go out.

Circuit configuration

As shown in the figure, this is a four-story corridor lighting delay control circuit. Transformer T1, rectifier bridge D1-D4 and capacitor C1 form a 12V power supply circuit. ICl (NE555) and peripheral components form a delay circuit, relay J and AC. The contactor KM constitutes a control circuit, and buttons S1, S2, S3 and S4 are respectively installed on the edge of each floor of the residential door, and the lamps L1, L2, L3 and L4 are respectively installed at the center of the top of each floor.

working principle

Just press any button S when going up and down the stairs. The 220V mains is transformed, rectified and filtered to obtain 12V DC voltage, which is added to the 4 and 8 feet of NE555. Because the NE555 2 and 6 feet are connected to the 220uF capacitor. The initial voltage is ov. Then the 3-pin output is high, the relay J is electrically connected, the normally-open contact J1 is closed, and the circuit enters the timing self-locking state; because the J1 is turned on, the AC contactor KM is electrically connected. Turn K on and the entire corridor lights are on. At the same time, capacitor C2 is charged. When the voltage rises to 2/3, the power supply voltage ends (about 3 minutes), NE5553 pin outputs low level, relay J loses power, contact J1 opens, AC contact KM loses power, K is off. The lights on the open and the corridors are all extinguished. If you press any button again, the lighting will be re-timed.

Component selection

IC1 uses NE555, T1 uses 3VA power transformer, D1-D5 uses 1N4007.J to select JRX-13F12V relay, KM selects general AC contactor. S1-S4 uses common button switches, and other components are shown in the figure.