CN203814018U - A light control switch circuit - Google Patents

Abstract

The utility model discloses an optical control switch circuit, which comprises a transformer, a rectification and filtering circuit, a time-base integrated circuit, a relay, a resistor, a photosensitive diode, a triode and a capacitor. The transformer is connected to an external power supply, and the rectification and filtering circuit is connected to an output end of the transformer. Pin 1 of the time base integrated circuit is grounded, pins 6 and 2 are connected to the anode of the photodiode, pin 7 is connected to the ground after capacitor C2 is connected in series, pins 4, 8 and the cathode of the photodiode are connected to the output end of the rectification filter circuit, pin 3 Connect to the base of the triode through the resistor R3. The utility model uses a time-base integrated circuit to solve the problem that the circuit is on and off in a critical state, and the utility model has the advantages of simple circuit, low failure rate and good lightning protection effect.

Description

A light control switch circuit

technical field

The invention relates to a light control circuit, that is, a circuit for controlling a street lamp switch with light.

Background technique

At present, the light control switch is generally used in lighting control. Through the cooperation of photoresistor and relay, the purpose of turning on the light when it is dark and turning off the light when it is bright is realized. However, if there is lightning at night, there will be lightning for a short period of time. Strong bright light is generated, which will cause the light control switch to malfunction, causing the lamps controlled by the light control switch to flicker, and the lightning protection effect is poor, and frequent malfunctions will shorten the life of the lamps.

Utility model content

In order to solve the above problems, the utility model provides a light control switch circuit. The light control switch has simple circuit and low failure rate.

The utility model is realized through the following technical solutions.

A light-controlled switch circuit, including a transformer T, a rectification and filtering circuit, a time-base integrated circuit IC, a relay J, a first resistor R1, a second resistor R2, a third resistor R3, a photodiode VD, a transistor Q1, and a first capacitor C1 , the second capacitor C2 and the third capacitor C3, the transformer T is connected to the external power supply, the rectification and filtering circuit is connected to the output terminal of the transformer T, pin 1 of the time-base integrated circuit IC is grounded, pin 6 and pin 2 are connected to the anode of the photodiode VD , the 7th pin is connected in series with the second capacitor C2 and grounded, the 4th pin, 8th pin and the cathode of the photodiode VD are connected to the output end of the rectification filter circuit, and the 3rd pin is connected to the base of the triode Q1 through the third resistor R3;

The collector of the triode Q1 is connected to pin 8 of the time-base integrated circuit IC through the relay J, and the emitter is grounded;

The anode of the photodiode VD is connected in series with the first resistor R1 and the second resistor R2 and grounded.

The base of the triode Q1 is connected in series with the third capacitor C3 and grounded.

The time base integrated circuit IC adopts 555 time base integrated circuit.

The second resistor R2 is a variable resistor.

The beneficial effects of the utility model are:

Compared with the prior art, the utility model can overcome the problem of "big return difference" of the time-base integrated circuit by setting the photodiode and the time-base integrated circuit in the circuit, and the time-base integrated circuit can solve the problem that the circuit is in a critical state. The problem of on-off and off-time. Different relays can be selected according to different loads. The utility model has the advantages of simple circuit, low failure rate and good lightning protection effect.

Description of drawings

Fig. 1 is the circuit diagram of the utility model.

Detailed ways

The technical solution of the utility model is further described below in conjunction with the accompanying drawings, but the scope of protection is not limited to the description.

As shown in Figure 1, a light control switch circuit described in the utility model includes a transformer T, a rectification filter circuit, a time base integrated circuit IC, a relay J, a first resistor R1, a second resistor R2, and a third resistor R3 , photodiode VD, transistor Q1, first capacitor C1, second capacitor C2 and third capacitor C3, the transformer T is connected to the external power supply, the rectifier filter circuit is connected to the output terminal of the transformer T, and pin 1 of the time-base integrated circuit IC is grounded. Pin 6 and pin 2 are connected to the anode of the photodiode VD, pin 7 is connected to the second capacitor C2 in series and grounded, pin 4, pin 8 and the cathode of the photodiode VD are connected to the output terminal of the rectifier and filter circuit, pin 3 is connected to the third resistor R3 is connected to the base of transistor Q1;

The collector of the triode Q1 is connected to pin 8 of the time-base integrated circuit IC through the relay J, and the emitter is grounded;

The anode of the photodiode VD is connected in series with the first resistor R1 and the second resistor R2 and grounded.

The base of the triode Q1 is connected in series with the third capacitor C3 and grounded.

The time base integrated circuit IC adopts 555 time base integrated circuit.

The second resistor R2 is a variable resistor.

The relay model can be selected according to the load.

The circuit of the utility model is simple. By arranging a photosensitive diode and a time-base integrated circuit in the circuit, the photosensitive diode can overcome the problem of "large return difference" of the time-based integrated circuit. problem. The utility model has the advantages of simple circuit, low failure rate and good lightning protection effect.

Claims (4)

1. a light-controlled switching circuit, comprise transformer (T), time-base integrated circuit (IC), relay (J), photodiode (VD), triode (Q1), the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the first electric capacity (C1), the second electric capacity (C2) and the 3rd electric capacity (C3), transformer (T) is connected with external power source, current rectifying and wave filtering circuit is connected with the output of transformer (T)

It is characterized in that: 1 pin ground connection of time-base integrated circuit (IC), the anodic bonding of 6 pin and 2 pin and photodiode (VD), 7 pin are connected in series the rear ground connection of the second electric capacity (C2), the negative electrode of 4 pin, 8 pin and photodiode (VD) is connected with the output of current rectifying and wave filtering circuit, 3 pin are connected with the base stage of triode (Q1) through the 3rd resistance (R3), and 8 pin are connected with the collector electrode of triode (Q1) through relay (J);

The grounded emitter of triode (Q1);

The anode of photodiode (VD) connect with the first resistance (R1) and the second resistance (R2) after ground connection.

2. a kind of light-controlled switching circuit according to claim 1, is characterized in that: ground connection after base stage series connection the 3rd electric capacity (C3) of described triode (Q1).

3. a kind of light-controlled switching circuit according to claim 1, is characterized in that: described time-base integrated circuit (IC) adopts 555 time-base integrated circuits.

4. a kind of light-controlled switching circuit according to claim 1, is characterized in that: described the second resistance (R2) is variable resistor.