Computer intelligent light control system

By automatically controlling the disconnection of the display's power supply circuit through a pyroelectric detection module and a time execution module, the problem of the display not turning off after the user leaves is solved, achieving energy-saving and adaptive lighting effects.

CN223626043UActive Publication Date: 2025-12-02NINGBO BEILUN YANWEI MECHANICAL & ELECTRICAL EQUIPMENT CO LTD
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Patent Information

Application Number
CN202423179687.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2025-12-02
Estimated Expiration
2034-12-23

AI Technical Summary

Technical Problem

The monitor failed to automatically turn off after the user left, resulting in increased energy consumption.

Method used

The system uses a pyroelectric detection module to detect human body heat, controls the opening and closing of the display's power supply circuit through a control module and a locking module, and achieves delayed power-off through a time execution module. It also adjusts the lighting brightness in conjunction with a light detection module.

Benefits of technology

It enables the display to automatically turn off after the user leaves the display to reduce energy consumption, and provides auxiliary lighting with appropriate brightness in different lighting environments.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a computer intelligent light control system, and relates to the technical field of computers. A control module; a locking module; a time execution module; if the pyroelectric detection module outputs a high-level pyroelectric detection signal, the control module receives the high-level pyroelectric detection signal to output a control signal, and the locking module receives the control signal and responds to the control signal to self-lock and close a power supply loop of the display; the time execution module receives the high-level pyroelectric detection signal and does not disconnect a power supply loop of the display; if the pyroelectric detection module outputs a low-level pyroelectric detection signal, the control module receives the low-level pyroelectric detection signal and does not output a control signal, and the locking module does not receive the control signal and does not self-lock and close a power supply loop of the display; and the time execution module receives the low-level pyroelectric detection signal to disconnect the power supply loop of the display. The method has the effect of reducing energy consumption.
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Description

Technical Field

[0001] This utility model relates to the field of computer technology, and in particular to a computer-based intelligent lighting control system. Background Technology

[0002] A computer is a modern intelligent electronic device that can run according to a program and automatically and at high speed process massive amounts of data.

[0003] A computer consists of multiple hardware components, including a central processing unit (CPU), memory, hard drive, graphics card, motherboard, and monitor. The CPU is the core component of the computer, equivalent to the human brain, and is used to execute instructions in programs, perform data calculations, and make logical judgments. Memory is used to temporarily store running programs and data, and its read and write speed is very fast, ensuring that the computer can run programs efficiently. The hard drive provides a large capacity for long-term storage. The graphics card is mainly responsible for processing and outputting image signals. The monitor is used to display clear images and video content processed by the graphics card, as well as the user interface.

[0004] Before a user needs to temporarily leave the monitor, they have to operate the host to put it into sleep mode or press the power switch to save power. This operation is too cumbersome, which leads to situations where the user does not turn off the monitor after leaving, thus increasing energy consumption. This needs to be improved. Utility Model Content

[0005] In order to reduce energy consumption, this utility model provides a computer-controlled intelligent lighting system.

[0006] In a first aspect, this utility model provides a computer-controlled intelligent lighting system, which adopts the following technical solution:

[0007] A computer-controlled intelligent lighting system includes:

[0008] The pyroelectric detection module is used to detect human body heat and convert it into a pyroelectric detection signal;

[0009] The control module is connected to the pyroelectric detection module to receive a high-level pyroelectric detection signal and output a control signal;

[0010] The locking module is connected to the control module to receive control signals and, in response to the control signals, self-locks and closes the power supply circuit of the display.

[0011] The timing execution module is connected to the pyroelectric detection module to receive a low-level pyroelectric detection signal and, in response to the low-level pyroelectric detection signal, to delay and disconnect the power supply circuit of the display.

[0012] If the pyroelectric detection module outputs a high-level pyroelectric detection signal, the control module receives the high-level pyroelectric detection signal and outputs a control signal. The locking module receives the control signal and responds to the control signal to lock and close the power supply circuit of the display. The time execution module receives the high-level pyroelectric detection signal but does not open the power supply circuit of the display.

[0013] If the pyroelectric detection module outputs a low-level pyroelectric detection signal, the control module receives the low-level pyroelectric detection signal and does not output a control signal. The locking module does not lock the power supply circuit of the display if it does not receive a control signal. The time execution module receives the low-level pyroelectric detection signal and disconnects the power supply circuit of the display.

[0014] By adopting the above technical solution, when the pyroelectric detection module detects human body heat, it outputs a pyroelectric detection signal to control the display to light up. When the pyroelectric detection module does not detect human body heat, the locking module can keep the display lit up, and the time execution module can delay disconnecting the power supply circuit of the display, thereby reducing the energy consumption of the display when the user leaves the front of the display for a long time.

[0015] Optionally, the control module includes:

[0016] A switching unit is connected to a pyroelectric detection module to receive a high-level pyroelectric detection signal and output a switching signal.

[0017] The trigger unit is connected to the switch unit to receive switch signals and output control signals to the locking module.

[0018] By adopting the above technical solution, the switching unit controls the triggering unit to output a control signal to the time execution module, thereby enabling the time execution module to control the delayed opening and closing of the display.

[0019] Optionally, the activation unit is connected to the pyroelectric detection module and is used to receive a low-level pyroelectric detection signal to output an activation signal;

[0020] A time execution unit, connected to the power-on unit, is used to receive a power-on signal and, in response to the power-on signal, to delay disconnect the power supply circuit of the display.

[0021] If the pyroelectric detection module outputs a high-level pyroelectric detection signal, the activation unit receives the high-level pyroelectric detection signal but does not output an activation signal, and the time execution unit does not receive an activation signal so as not to disconnect the power supply circuit of the display.

[0022] If the pyroelectric detection module outputs a low-level pyroelectric detection signal, the activation unit receives the low-level pyroelectric detection signal and outputs an activation signal. The time execution unit receives the activation signal and delays to disconnect the power supply circuit of the display.

[0023] By adopting the above technical solution, the time execution unit is controlled by the activation unit in response to the activation signal, thereby enabling the time execution unit to control the delayed opening and closing of the display.

[0024] Optionally, a first start-up module is used to turn the power supply circuit of the pyroelectric detection module on and off.

[0025] By adopting the above technical solution, the power supply circuit of the pyroelectric detection module is turned on and off by the first start-up module, so that the user can choose whether to perform the operation of delaying the shutdown of the display.

[0026] Optional, a light detection module is used to detect the ambient light intensity and output a light detection signal;

[0027] The light control module is connected to the light detection module to receive light detection signals and output light control signals;

[0028] The lighting module connects to the light control module to receive light control signals and provide lighting.

[0029] By adopting the above technical solution, the light intensity of the environment is detected by the light detection module to control the output of the light control module, thereby enabling different brightness lighting in different lighting environments, and thus providing auxiliary lighting when using the display.

[0030] Optionally, a light adjustment module connected to the light control module and used to change the brightness of the lighting module may also be included.

[0031] By adopting the above technical solution, the brightness of the lighting module can be changed through the light adjustment module, thereby enabling users to conveniently select a suitable brightness.

[0032] Optionally, a second start-up module is also included for the power supply circuit of the lighting module to turn on and off.

[0033] By adopting the above technical solution, the power supply circuit of the lighting module is turned on and off through the second start-up module, thereby allowing the user to choose whether the lighting module is needed to perform auxiliary photo operation.

[0034] Optionally, an indicator module for indicating the on / off state of the power supply circuit to the display may also be included.

[0035] By adopting the above technical solution, the indicator module displays the working status of the monitor, thereby enabling users to easily understand the working status of the monitor.

[0036] Optionally, the pyroelectric detection module includes a pyroelectric infrared sensor RS, the control module includes a resistor R1, a transistor Q1 and a relay KM1, the locking module includes a relay KM2, and the time execution module includes a resistor R2, a transistor Q2 and a time relay KT1.

[0037] The drain D of the pyroelectric infrared sensor RS is connected to the power supply VCC. The ground terminal G of the pyroelectric infrared sensor RS is connected to ground GND. The source S of the pyroelectric infrared sensor is connected to the base of transistor Q1. The collector of transistor Q1 is connected to one end of resistor R1. The other end of resistor R1 is connected to the power supply VCC. The emitter of transistor Q1 is connected to one end of relay KM1. The other end of relay KM1 is connected to ground GND.

[0038] The source S of the pyroelectric infrared sensor RS is connected to the base of transistor Q2. The collector of transistor Q2 is connected to one end of resistor R2, and the other end of resistor R2 is connected to power supply VCC. The emitter of transistor Q2 is connected to one end of time relay KT1, and the other end of time relay KT1 is connected to ground GND.

[0039] One end of relay KM2 is connected to the display, and the other end of the display is connected to the 220V AC power supply. One end of the normally open contact KM1-1 of relay KM2, the other end of relay KM2-1, and one end of normally open contact KM2-1 of relay KM2 are connected to the display. The other end of normally open contact KM1-1, the other end of normally open contact KM2-1 of relay KM2, and one end of normally closed contact KT1-1 of time relay KT1-1 are connected to the 220V AC power supply.

[0040] In summary, this application includes at least one of the following beneficial technical effects:

[0041] 1. When the pyroelectric detection module detects human body heat, it outputs a pyroelectric detection signal to control the display to light up. When the pyroelectric detection module does not detect human body heat, the locking module can keep the display lit up, and the time execution module can delay disconnecting the power supply circuit of the display, thereby reducing the energy consumption of the display when the user leaves the front of the display for a long time.

[0042] 2. By controlling the time execution unit to respond to the turn-on signal through the turn-on unit, the display can be controlled to turn on and off with a delay through the time execution unit;

[0043] 3. The light intensity of the environment is detected by the light detection module to control the output of the light control module, thereby enabling different brightness of illumination in different lighting environments, and thus providing auxiliary lighting when using the display. Attached Figure Description

[0044] Figure 1 This is a circuit diagram of a computer-controlled intelligent lighting system according to an embodiment of the present invention. Figure 1 ;

[0045] Figure 2 This is a circuit diagram of a computer-controlled intelligent lighting system according to an embodiment of the present invention. Figure 2 .

[0046] The parts referred to by the numbers in the above figures are as follows: 1. Pyroelectric detection module; 2. Control module; 3. Switching unit; 4. Triggering unit; 5. Locking module; 6. Time execution module; 7. Opening unit; 8. Time execution unit; 9. First start module; 10. Light detection module; 11. Light control module; 12. Illumination module; 13. Light adjustment module; 14. Second start module; 15. Indicator module. Detailed Implementation

[0047] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0048] Reference Figure 1 This application discloses a computer-controlled intelligent lighting system, including a pyroelectric detection module 1 for detecting human body heat and converting it into a pyroelectric detection signal, a control module 2 for receiving a high-level pyroelectric detection signal and outputting a control signal, a locking module 5 for self-locking and closing the power supply circuit of the display, a time execution module 6 for delaying and disconnecting the power supply circuit of the display, a first start module 9 for opening and closing the power supply circuit of the pyroelectric detection module 1, and an indication module 15 for indicating the on / off state of the power supply circuit of the display.

[0049] Control module 2 includes a switch unit 3 and a trigger unit 4, and time execution module 6 includes an activation unit 7 and a time execution unit 8.

[0050] The first start-up module 9 is connected to the pyroelectric detection module 1 to control the start and stop of the power supply circuit of the pyroelectric detection module 1. The pyroelectric detection module 1 is used to receive the start-up signal, detect the temperature difference parameter, and convert the detected temperature difference parameter into a pyroelectric detection signal.

[0051] The first startup module 9 is a normally open switch S1, and the pyroelectric detection module 1 uses a pyroelectric infrared sensor RS of model LHI958. One end of the normally open switch S1 is connected to the power supply VCC, and the other end of the normally open switch S1 is connected to the drain D of the pyroelectric infrared sensor RS. The ground terminal G of the pyroelectric infrared sensor RS is connected to ground GND. When the pyroelectric infrared sensor RS detects human body heat, the source S of the pyroelectric infrared sensor RS outputs a high-level pyroelectric detection signal; when the pyroelectric infrared sensor RS does not detect human body heat, the source S of the pyroelectric infrared sensor RS outputs a low-level pyroelectric detection signal.

[0052] Switching unit 3 is connected to pyroelectric detection module 1 to receive a high-level pyroelectric detection signal and output a start signal. Triggering unit 4 is connected to switching unit 3 to receive the start signal and output a control signal to locking module 5.

[0053] Switching unit 3 includes an NPN transistor Q1 (model 9013) and a resistor R1 for protection circuitry. Triggering unit 4 uses a relay KM1 (model SMIH-05-T).

[0054] The source S of the pyroelectric infrared sensor RS is connected to the base of transistor Q1. The emitter of transistor Q1 is connected to one end of relay KM1. The other end of relay KM1 is connected to ground GND. The collector of transistor Q1 is connected to one end of resistor R1. The other end of resistor R1 is connected to power supply VCC.

[0055] When the pyroelectric infrared sensor RS outputs a high-level pyroelectric detection signal, transistor Q1 is connected to the pyroelectric infrared sensor RS to receive the high-level pyroelectric detection signal and realize the circuit conduction, thereby controlling the relay KM1 to be energized.

[0056] The locking module 5 is connected to the trigger unit 4 to receive and respond to the control signal. When the locking module 5 is energized, the indicator module 15 is energized to indicate the on / off state of the power supply circuit of the display.

[0057] The locking module 5 uses a relay KM2 of model HH54P. The indicating module 15 includes an LED of model SLR-343VRT32P, a resistor R5 for voltage division and protection, a diode D3 of model SMA2EZ220D5 for converting AC to DC to achieve unidirectional conduction, and a diode D4 of model SS220 for reducing reverse breakdown in the circuit.

[0058] One end of the normally open contact KM1-1 of the relay, one end of the relay KM2, and one end of the normally open contact KM2-1 of the relay are connected. The other end of the relay KM2, one end of the display, and one end of the resistor R5 are connected. The other end of the resistor R5 is connected to the cathode of the diode D3. The anode of the diode D3, the anode of the diode D4, and the cathode of the light-emitting diode LED are connected. The anode of the light-emitting diode LED, the cathode of the diode D4, and the other end of the display are connected to the AC power supply 220V, thereby enabling the indicator module 15 to continue to operate normally under the AC power supply 220V.

[0059] The activation unit 7 is connected to the pyroelectric infrared sensor RS to receive a low-level pyroelectric detection signal and output an activation signal. The time execution unit 8 is connected to the activation unit 7 to receive the activation signal and, in response to the activation signal, delay disconnecting the power supply circuit of the display.

[0060] The activation unit 7 includes a PNP transistor Q2 of model 2N3906 and a resistor R2 for protection circuit. The time execution unit 8 uses a time relay KT1 of model HHS5PF.

[0061] The source S of the pyroelectric infrared sensor RS is connected to the base of transistor Q2. The collector of transistor Q2 is connected to one end of resistor R2, and the other end of resistor R2 is connected to power supply VCC. The emitter of transistor Q2 is connected to one end of time relay KT1, and the other end of time relay KT1 is connected to ground GND.

[0062] One end of the normally closed contact KT1-1 of the time relay, the other end of the relay KM2, and the other end of the normally open contact KM2-1 of the relay are connected. The other end of the normally closed contact KT1-1 of the time relay is connected to the 220V AC power supply.

[0063] Before the user leaves the display screen, the source S of the pyroelectric infrared sensor RS outputs a low-level pyroelectric detection signal and controls the time relay KT1 to disconnect the power supply circuit of the display screen after a delay.

[0064] When the user returns to the display screen within a preset reference time, the source S of the pyroelectric infrared sensor RS outputs a high-level pyroelectric detection signal and controls the time relay KT1 to keep the power supply circuit to the display screen open, thus maintaining the display. If the user returns to the display screen for longer than the preset reference time, the time relay KT1 is controlled to delay disconnecting the power supply circuit to the display screen, thereby turning off the power to the display screen and reducing energy consumption.

[0065] Reference Figure 2A computer-controlled intelligent lighting system further includes a light detection module 10 for detecting ambient light intensity and outputting a light detection signal, a light control module 11, a lighting module 12, a light adjustment module 13, and a second start module 14 for turning the power supply circuit of the lighting module 12 on and off.

[0066] The light detection module 10 is connected to the relay KM1 to receive control signals and respond to the control signals to turn on the power supply circuit of the light detection module 10, and control the light detection module 10 to be powered on to detect the ambient light intensity and output a light detection signal. The light control module 11 is connected to the light detection module 10 to receive the light detection signal and output a light control signal. The lighting module 12 is connected to the light control module 11 to receive the light control signal and realize lighting. The light adjustment module 13 is connected to the light control module 11 to adjust the brightness of the lighting module 12. The second start module 14 is connected to the lighting module 12 to turn on and off the power supply circuit of the lighting module 12.

[0067] The light detection module 10 uses a negative coefficient photodiode D1 of model TSL235R. The light adjustment module 13 includes potentiometers W1 and W2 of model WTH118 used for adjusting voltage and current. The lighting module 12 uses a lighting lamp L1 of model SM2196EJ. The light control module 11 includes resistors R3 and R4 used for voltage division and circuit protection, diode D2 of model SMA2EZ220D5 used for converting AC to DC, capacitor C1 of model EPCOS-B32922H3104M used for storing electrical energy, and silicon controlled rectifier (SCR) of model BTA16 used for adjusting the brightness of lighting lamp L1.

[0068] One end of the normally open contact KM2-2 of the relay is connected to one end of the lighting lamp L1. The other end of the lighting lamp L1 is connected to the 220V AC power supply. The other end of the normally open contact KM2-2 of the relay, one end of the SCR, one end of potentiometer W1, and one end of potentiometer W2 are connected. The other end of potentiometer W1 is connected to one end of resistor R3. The other end of resistor R3, the anode of diode D2, and the anode of photodiode D1 are connected. The other end of potentiometer W2 is connected to one end of resistor R4. The other end of resistor R4, the cathode of diode D2, one end of capacitor C1, and the control terminal of the SCR are connected. The other end of capacitor C1, the cathode of photodiode D1, the other end of the SCR, and one end of normally open contact S2 are connected. The other end of normally open contact S2 is connected to the 220V AC power supply.

[0069] When the source S of the pyroelectric infrared sensor RS outputs a high-level pyroelectric detection signal, the transistor Q1 is connected to the pyroelectric infrared sensor RS to receive the high-level pyroelectric detection signal and realize the circuit conduction, control the relay KM1 to be energized and make the power supply circuit of the relay KM2 conduct, thereby closing the normally open contact KM2-2 of the relay.

[0070] When the normally open contacts KM2-2 and S2 of the relay are closed and conducting, the photodiode D1 detects the ambient light intensity and adjusts the corresponding resistance value. The higher the light intensity, the lower the resistance value. By adjusting the potentiometer W1, the potential between the potentiometer W1 and the resistor R3 changes, thereby controlling the charging speed of the capacitor C1 to achieve the brightness change of the lamp L1. By adjusting the potentiometer W1, the potential between the potentiometer W1 and the resistor R4 changes, thereby controlling the charging start voltage of the capacitor C1 to control the dimming brightness of the lamp L1.

[0071] When the ambient light intensity detected by photodiode D1 decreases, the resistance of photodiode D1 decreases. Consequently, the potential between potentiometer W1 and resistor R3 decreases, the charging speed of capacitor C1 slows down, the conduction angle of the silicon controlled rectifier (SCR) decreases, and the brightness of the illumination lamp L1 decreases. This allows users to use the display under different lighting conditions, reducing glare and reflections caused by the display. In this embodiment, the various power supplies are adjusted by those skilled in the art as needed, and will not be elaborated upon here.

[0072] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A computer-controlled intelligent lighting system, characterized in that, include: The pyroelectric detection module (1) is used to detect human body heat and convert it into a pyroelectric detection signal; The control module (2) is connected to the pyroelectric detection module (1) to receive a high-level pyroelectric detection signal and output a control signal; The locking module (5) is connected to the control module (2) to receive control signals and respond to the control signals to lock the power supply circuit of the display. The time execution module (6) is connected to the pyroelectric detection module (1) to receive a low-level pyroelectric detection signal and respond to the low-level pyroelectric detection signal to delay disconnect the power supply circuit of the display; If the pyroelectric detection module (1) outputs a high-level pyroelectric detection signal, the control module (2) receives the high-level pyroelectric detection signal and outputs a control signal, the locking module (5) receives the control signal and responds to the control signal to lock the power supply circuit of the display, and the time execution module (6) receives the high-level pyroelectric detection signal without opening the power supply circuit of the display. If the pyroelectric detection module (1) outputs a low-level pyroelectric detection signal, the control module (2) receives the low-level pyroelectric detection signal and does not output a control signal. The locking module (5) does not lock the power supply circuit of the display if it does not receive a control signal. The time execution module (6) receives the low-level pyroelectric detection signal and disconnects the power supply circuit of the display.

2. The computer-controlled intelligent lighting system according to claim 1, characterized in that, The control module (2) includes: The switching unit (3) is connected to the pyroelectric detection module (1) to receive a high-level pyroelectric detection signal and output a switching signal; The trigger unit (4) is connected to the switch unit (3) to receive the switch signal and output the control signal to the locking module (5).

3. The computer-controlled intelligent lighting system according to claim 1, characterized in that, The time execution module (6) includes: The activation unit (7) is connected to the pyroelectric detection module (1) and is used to receive a low-level pyroelectric detection signal to output an activation signal; The timing execution unit (8) is connected to the activation unit (7) and is used to receive the activation signal and, in response to the activation signal, delay disconnect the power supply circuit of the display. If the pyroelectric detection module (1) outputs a high-level pyroelectric detection signal, the activation unit (7) receives the high-level pyroelectric detection signal and does not output an activation signal, and the time execution unit (8) does not receive an activation signal so as not to disconnect the power supply circuit of the display. If the pyroelectric detection module (1) outputs a low-level pyroelectric detection signal, the activation unit (7) receives the low-level pyroelectric detection signal and outputs an activation signal, and the time execution unit (8) receives the activation signal to delay and disconnect the power supply circuit of the display.

4. The computer-controlled intelligent lighting system according to claim 1, characterized in that, It also includes a first start-up module (9) for starting and stopping the power supply circuit of the pyroelectric detection module (1).

5. A computer-controlled intelligent lighting system according to claim 1, characterized in that, Also includes: The light detection module (10) is used to detect the ambient light intensity and output a light detection signal; The light control module (11) is connected to the light detection module (10) to receive the light detection signal and output the light control signal; The lighting module (12) is connected to the light control module (11) to receive light control signals and implement lighting.

6. A computer-controlled intelligent lighting system according to claim 5, characterized in that, It also includes a light adjustment module (13) connected to the light control module (11) and used to change the brightness of the lighting module (12).

7. A computer-controlled intelligent lighting system according to claim 5, characterized in that, It also includes a second start module (14) for the power supply circuit of the lighting module (12) for turning the lighting module (12) on and off.

8. A computer-controlled intelligent lighting system according to claim 1, characterized in that, It also includes an indicator module (15) for indicating whether the power supply circuit to the display is on or off.

9. A computer-controlled intelligent lighting system according to claim 1, characterized in that, The pyroelectric detection module (1) includes a pyroelectric infrared sensor RS, the control module (2) includes a resistor R1, a transistor Q1 and a relay KM1, the locking module (5) includes a relay KM2, and the time execution module (6) includes a resistor R2, a transistor Q2 and a time relay KT1. The drain D of the pyroelectric infrared sensor RS is connected to the power supply VCC. The ground terminal G of the pyroelectric infrared sensor RS is connected to ground GND. The source S of the pyroelectric infrared sensor is connected to the base of transistor Q1. The collector of transistor Q1 is connected to one end of resistor R1. The other end of resistor R1 is connected to the power supply VCC. The emitter of transistor Q1 is connected to one end of relay KM1. The other end of relay KM1 is connected to ground GND. The source S of the pyroelectric infrared sensor RS is connected to the base of transistor Q2. The collector of transistor Q2 is connected to one end of resistor R2, and the other end of resistor R2 is connected to power supply VCC. The emitter of transistor Q2 is connected to one end of time relay KT1, and the other end of time relay KT1 is connected to ground GND. One end of relay KM2 is connected to the display, and the other end of the display is connected to the 220V AC power supply. One end of the normally open contact KM1-1 of relay KM2, the other end of relay KM2-1, and one end of normally open contact KM2-1 of relay KM2 are connected to the display. The other end of normally open contact KM1-1, the other end of normally open contact KM2-1 of relay KM2, and one end of normally closed contact KT1-1 of time relay KT1-1 are connected to the 220V AC power supply.