Relay control lighting circuit diagram

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Relay control lighting circuit diagram (1)

The electric light remote control switch circuit consists of two parts, transmitting and receiving, as shown in the figure. Figure (a) shows the transmitting part, which is a transmitter. Transistor VT1, VT2 is - a self-excited multivibrator, which is not a collector load resistor, but the inductor. When the power switch SB is on the stage, the oscillating circuit works, the two tubes are turned on and off in turn, and the current is intermittently passed through the coil. After the mutual inductance of L1 and L2, the high-frequency oscillating signal is directly radiated from the transmitting antenna WD1 to the space. The working band of the emission can be determined by selecting the sizes of the capacitors C2, C3 and the resistors R1 and R2. Adjust the capacitor c1 to change the oscillation frequency.

Figure (b) shows the receiving part. After receiving the spatial electromagnetic wave, the receiving antenna WD2 selects the high-frequency oscillating signal from the transmitting through the resonant circuit. Since this signal is strong, it is applied to the base of the transistor VT3 to make the VT3 saturate. After the triode detection, VT3, VT4 composite tube is amplified, a larger current is passed through the transistor, the collector of VT4, and the relay KA connected in series with the VT4 collector is attracted. When the relay KA is activated, the actuator is driven to control the opening and closing of the lamp. When in use, press the button SB of the transmitter. The receiver fixed on the light switch works, the relay armature pulls in, and the ratchet rotates through a tooth, and the light is turned off or turned off.

Relay control lighting circuit diagram (2)

The relay light control switch circuit is as shown below. The main feature is that there is light during the day, the light bulb is not bright, the night is dull, the circuit is automatically energized, and the light bulb is on.

During the daytime, under strong illumination, the resistance of the light pipe 227A (a kind of photoresistor) is very small, about 20~50kΩ, the transistor VT2 obtains the base current and conducts, and the VT1 gets the positive bias voltage from R2 and is also turned on. The relay coil KA is energized, the normally closed electric shock of the relay 2, 3 is disconnected, and the two thyristors V1 and V2 have no trigger signal and are not turned on, so the bulb EL does not light.

As night falls, as the light intensity decreases, the resistance of the light pipe 227A continues to increase, eventually reaching about 1 MΩ. VT1 is cut off due to the base current being too small, and VT1 is also cut off. The relay KA is de-energized and the normally closed electric shock 2 3, the thyristors V1, V2 are in a double-conducting state due to the connection of the two controls, the power is turned on, and the illumination is on.

In the figure, the capacitor C3 is used to prevent the nighttime strong light interference from causing the illumination to be extinguished. When the brightness intensity changes slowly at the critical point attachment, it will easily cause the relay to vibrate and the light will flash. C2 can filter out the pulse current and avoid the illumination.

Relay control lighting circuit diagram (3)

The traditional indoor lighting control is a simple control mode of the wall switch, which is completely controlled by people. Because of the lack of energy-saving awareness of the personnel entering the room, all the lights are turned on at will, resulting in waste of energy. The device is analyzed and processed by the intelligent processor to determine whether the light switch power supply is finally turned on or not, effectively avoiding the occurrence of power-on and bright inside the actual classroom. This design is mainly to complete the automatic adjustment function of indoor lighting. The light intensity is collected by the photoresistor, and the corresponding analog signal quantity is obtained by the characteristics of the photoresistor. The MSC51 single-chip microcomputer and the MSC51 single-chip microcomputer process the corresponding signals after receiving the signal, giving the control signal and controlling the relay to be connected. Whether or not to achieve intelligent control of the light. This design achieves the purpose of energy saving by reasonably controlling the number of lamps under the mediation of effective illumination intensity.

Solve the problem of electric energy waste in indoor public lighting. The light intensity signal is collected by the photoresistor, and the digital signal is converted to the single chip analysis and judgment processing, and then the relay controls the lighting and lighting circuit to finally determine whether the lighting power is turned on or off, thereby saving energy. In terms of innovation, the photoresistor is integrated with the single-chip microcomputer to control the indoor light, change the traditional control mode, and reasonably control the number of lights. The key points are the acquisition of the signal and the MCS-51 logic decision. The device is analyzed by an intelligent processor to give a control signal, which is different from the traditional lighting control mode. The traditional indoor lighting control is a simple control mode of the wall switch, which is completely controlled by people. Because of the lack of energy-saving awareness of the personnel entering the room, all the lights are turned on at will, resulting in waste of energy. In addition, a real-time light intensity signal is acquired by using a photoresistor to obtain real-time light intensity. The user of the device only needs to turn on the power according to the usual habits. Finally, whether the power of the lamp can be turned on depends on the control signal given by the intelligent processor, and the whole process is automatically completed by the intelligent controller.

The three biggest advantages 1, energy saving 2, low cost 3, automatic adjustment of the intensity of the lamp line

This device is suitable for indoor lighting environments similar to school classrooms. At present, the lighting control of the classroom is completely determined by the human mind, resulting in a serious waste of electrical energy. Due to the low cost of the equipment, the connection and transformation of the line is simple, easy to promote and apply, and the economic benefits are considerable.

Relay control lighting circuit diagram (4)

Controller working process

Set the on time and off time of the daily power supply of the microcomputer control switch as needed. By the time of opening. The microcomputer time switch is turned on, and the light and light of the light during this time also depends on the brightness of the light. The daylight is bright. The photoresistor cds in the light control switch is illuminated by light, the resistance value becomes smaller, the transistors T1 and T2 are turned off, and the relay J coil loses the electrical contact. The AC contact CJ coil loses power and does not pull in. The main contact cuts off the illumination supply. When the brightness of the cloudy day is weak and at night, the resistance value is increased due to the weak illumination and no light of the photoresistor cds, the transistors T1 and T2 are saturated, the relay J is electrically connected, and the illumination is switched through the AC contactor CJ. power supply. When it is turned off, the microcomputer time switch will cut off the power of the light control switch. After the light control switch loses power, the AC contactor CJ coil will also be de-energized, and the main contact will cut off the lighting power. Thereby achieving the purpose of intelligent control of lighting.

Controller circuit design

The microcomputer time control switch adopts KG316T type, and the light control switch is self-made. The photoresistor cds were removed from the old voice-activated delay switch. The relay is of the JQX-4 type and the coil is rated at 12V. The two sets of contacts are connected in parallel for improved reliability. The red LED acts as a turn-on indication for the light control switch. Parallel to the coil of the AC contactor CJ.

As long as the components used are genuine and soldered correctly, they will succeed. When debugging, first do not connect the AC contactor CJ, block the light on the photoresistor by hand, J is attracted, the LED is bright; when the hand is removed, J is disconnected and the LED is off. Adjusting the resistance of the resistor R adjusts the sensitivity of the light control. CJ is a 20A AC contactor. The coil voltage is 220V and the model number is CDC10-20.

The entire light control switch is housed in a self-made wooden box. The microcomputer time control switch is mounted on the wooden box, and two Φ5mm holes are opened on the side of the wooden box for mounting the LED and the photoresistor. The wooden box is placed. The side of the power distribution room, the IED and the photoresistor face the window. The AC contactor is installed next to the lighting control air switch in the power distribution cabinet, and the entire controller is installed. When using, according to the description of KG316T microcomputer time switch, set the opening time and closing time of daily lighting power supply, it can be put into use.

Relay control lighting circuit diagram (5)

Wireless transmission system circuit: mainly used PT2262 chip to complete, circuit PT2262 encodes the button signal, can control 4 channels. In Figure 2, pins 1~8 of PT2262 are coded address terminals. Each address terminal can be set to “high level” (the pin is connected to 12 V), “low level” (the foot is grounded), and “floating”. State. Pins 10~13 are coded data inputs D3~D0 (using 4-bit data), and a button is connected to each data terminal to control different devices. When the button is pressed, the button applies a voltage of 12 V to the corresponding data terminal, and the data terminal transmits the signal through the crystal oscillator. The PT2262 will encode according to the address code setting and input data, and output the encoded pulse from pin 17. The wireless communication is controlled by the coded pulse. When the 17-pin pulse is “1”, the oscillator composed of V1 operates to generate a high-frequency signal of 315 MHz and is transmitted. When the output pulse of the 17-pin is “0”, the oscillation of V1 is composed. The device stops working.

Wireless receiving system circuit: The receiving system circuit is mainly composed of receiving module (including RF module, chip PT2272 and peripheral circuit), relay circuit and load circuit, as shown in Figure 3. Pins 1~8 of PT2272 are decoding address terminals. Each address terminal can be set to “high level” (the pin is connected to 5 V), “low level” (the foot is grounded), and “floating”. The setting of the decoding address corresponds to the address encoding of the PT2272. After the RF module receives the signal sent by the transmitting circuit, the PT2272 performs address code comparison check (decoding). If the address code is checked correctly, the transmitting module TE pin (the encoding start end is used for multi-data encoding and transmitting, and the active level is valid. The signal sent by the RF module is connected to the PT2272 by the Din pin (14 pins), and the data enters the MCU through the data output pins D0~D3 (10~13 pins) of the PT2272; otherwise, the data output pin of the PT2272 has no action. When the signal enters the microcontroller, the microcontroller analyzes it and makes corresponding control. If the received first signal is high, the digital display tube controlled by the MCU will display “11” (the first “1” indicates the first signal, and the second “1” indicates that the signal is high. At the same time, the MCU sends a high level to the relay circuit, the relay is closed, and the load circuit works; when the second time receives the high level, the corresponding port level is set to zero by the MCU; when the third time receives the high level Set again, cycle like this; when the display of the digital tube is "1 1" (the first 1 indicates the first signal, the second 1 indicates the signal is low), then the microcontroller sends a low power to the relay circuit. Flat, the relay is disconnected and the load stops working. Flexible control and clear display with relays and digital tubes.