Street light controller using dual D flip-flop CD4013

This light-controlled street lamp adopts CD4013 dual D flip-flop integrated circuit, which has simple circuit structure, is easy to make, and works stably and reliably.

1. Circuit Working Principle

The circuit principle is shown in the figure below.

The light-controlled street lamp circuit consists of a power supply circuit, a light-controlled circuit and a control execution circuit. After the AC 220V voltage is rectified by VD1~VD4, limited by R1, filtered by C1 and stabilized by VS, it provides a +12V working voltage for the light-controlled circuit and the execution circuit.

During the day, RG1 and RG2 are exposed to light and are in a low-resistance state. The S1 terminal of the IC is at a low level, the R1 terminal is at a high level, the 1 terminal outputs a low level, VT is in the cut-off state, K is in the released state, and the lighting lamp EL is not on.

At night, the resistance of RG1 and RG2 increases due to the absence of light or weak light, making the S1 terminal of IC become high level, the R1 terminal become low level, the Q1 terminal outputs high level, VT is saturated and turned on, K is energized and absorbed, its normally open contact is connected, and EL lights up.

After daybreak, the resistance of RG1 and RG2 decreases, and the Q1 terminal of IC outputs a low level again, VT is cut off, K is released, and EL is extinguished.

2. Component Selection

IC uses CD4013 or CC4013 dual D flip-flop integrated circuit, VT uses 8050 or 9014 silicon NPN transistor; RG1 and RG2 use MG45 series photoresistors; VD1~VD5 use IN4007 or IN4004 rectifier diodes. VS uses 1W, 12V voltage regulator tube, C1 uses 25V aluminum electrolytic capacitor, C2 uses 16V aluminum electrolytic capacitor, RP1 and RP2 use ordinary potentiometers, R1 uses 2W metal film resistor, R2~R4 use ordinary 1/8 or 1/4W metal film resistors, K uses 12V DC relay, and its contact current capacity depends on EL power.

3. Production and debugging methods

After the circuit components are selected correctly and soldered correctly, it can be used. The sensitivity of the light control can be adjusted by adjusting the resistance values ​​of RP1 and RP2.