A logic control device for access control

Abstract

This utility model relates to a logic control device for access control systems, comprising a first monostable multivibrator (MSF), a second MSF, and an AND gate. The input of the first MSF is connected to the output of an access control card reader, the input of the second MSF is connected to the output of a license plate recognition device, the output of the first MSF is connected to one input of the AND gate, the output of the second MSF is connected to the other input of the AND gate, and the output of the AND gate is used to connect to the control terminal of a barrier gate. This utility model uses the two monostable multivibrators to maintain the license plate recognition signal from the license plate recognition device and the access card recognition signal from the access control card reader for a period of time. During this period, both the license plate recognition signal and the access card recognition signal are high-level signals. The high-level signal output by the AND gate then controls the barrier gate to open, thus satisfying the functions of an environmentally friendly access control system and the enterprise's original access control system while reducing costs.

Description

Technical Field

[0001] This utility model relates to the field of security technology, and is a logic control device applied to access control systems. Background Technology

[0002] Many enterprises are gradually installing mobile source emergency access control systems (hereinafter referred to as "environmental protection access control systems") to manage freight vehicles entering and exiting the enterprise. Typically, environmental protection access control systems are incompatible with the enterprise's original access control system. The environmental protection access control system uses card readers to identify personnel entering and exiting, while the original access control system uses license plate recognition devices to identify license plate numbers. Therefore, the two cannot be connected to the same barrier gate device simultaneously. Consequently, a new barrier gate device needs to be added at the original entrance and exit of the factory area, solely for the environmental protection access control system. This solution increases both enterprise expenditure and the footprint of the access control system, as well as increasing costs and subsequent maintenance workload. Utility Model Content

[0003] To address the technical issues of incompatibility between environmental access control systems and existing enterprise access management systems, which leads to increased costs and maintenance workload, this utility model provides a logic control device for access control systems.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A logic control device for access control includes a first monostable multivibrator, a second monostable multivibrator, an AND gate, a rectifier transformer, and a power conversion module; The input terminal of the rectifier transformer is connected to AC mains power, the output terminal of the rectifier transformer is connected to the input terminal of the power conversion module, and the output terminal of the power conversion module is respectively connected to the power supply terminal of the first monostable multivibrator, the power supply terminal of the second monostable multivibrator, and the power supply terminal of the AND gate. The input of the first monostable multivibrator is connected to the output of the access control card reader, the input of the second monostable multivibrator is connected to the output of the license plate recognition device, the output of the first monostable multivibrator is connected to one input of the AND gate, the output of the second monostable multivibrator is connected to the other input of the AND gate, and the output of the AND gate is used to connect to the control terminal of the barrier gate.

[0005] The beneficial effects of this utility model are as follows: By using two monostable triggers to hold the license plate recognition signal output from the license plate recognizer and the access card recognition signal output from the access control card reader for a period of time, license plate recognition and access card recognition can be performed separately during the holding time. This allows personnel to perform license plate recognition and access card recognition operations separately during the signal holding time. The holding signals output by the two monostable triggers are then passed through an AND gate. If both the license plate recognition signal and the access card recognition signal are high-level signals during the signal holding time, it indicates that both license plate recognition and access card recognition have been successful. The AND gate outputs a high-level signal, which controls the gate to open. This integrates the environmental protection access control system with the company's original access control system into one system to control the gate to open. This satisfies the functions of both the environmental protection access control system and the company's original access control system while reducing the cost of building a new access control system.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, it also includes a signal amplifier, the input of which is connected to the output of the AND gate, and the output of which is used to connect to the control terminal of the barrier gate.

[0008] The advantage of adopting the above-mentioned further solution is that by setting a signal amplifier, the driving capability of the AND gate output signal can be improved.

[0009] Furthermore, the first monostable multivibrator includes a first integrated trigger chip, a first resistor, and a first capacitor. The external capacitor terminal of the first integrated trigger chip is connected to one end of the first capacitor, the external resistor terminal of the first integrated trigger chip is connected to the other end of the first capacitor, the external resistor terminal of the first integrated trigger chip is connected to one end of the first resistor, the other end of the first resistor is connected to the power supply terminal of the first integrated trigger chip, and the power supply terminal of the first integrated trigger chip is connected to the output terminal of the power conversion module. The negative edge trigger input terminal of the first integrated trigger chip is grounded, the positive edge trigger input terminal of the first integrated trigger chip is connected to the output terminal of the access control card reader, and the non-phase output terminal of the first integrated trigger chip is connected to one input terminal of the AND gate.

[0010] Furthermore, the second monostable multivibrator includes a second integrated trigger chip, a second resistor, and a second capacitor. The external capacitor terminal of the second integrated trigger chip is connected to one end of the second capacitor, the external resistor terminal of the second integrated trigger chip is connected to the other end of the second capacitor, the external resistor terminal of the second integrated trigger chip is connected to one end of the second resistor, the other end of the second resistor is connected to the power supply terminal of the second integrated trigger chip, and the power supply terminal of the second integrated trigger chip is connected to the output terminal of the power conversion module. The negative edge trigger input terminal of the second integrated trigger chip is grounded, the positive edge trigger input terminal of the second integrated trigger chip is connected to the output terminal of the license plate recognizer, and the non-phase output terminal of the second integrated trigger chip is connected to the other input terminal of the AND gate.

[0011] Furthermore, the resistance value of the first resistor is equal to the resistance value of the second resistor, the capacitance of the first capacitor is equal to the capacitance of the second capacitor, and the model of the first integrated trigger chip is the same as the model of the second integrated trigger chip.

[0012] Furthermore, both the first integrated trigger chip and the second integrated trigger chip are trigger chips with the model number 74121.

[0013] Furthermore, the signal amplifier includes a third resistor, a fourth resistor, a fifth resistor, and an operational amplifier; one end of the third resistor is grounded, and the other end of the third resistor is connected to the inverting input terminal of the operational amplifier; one end of the fourth resistor is connected to the inverting input terminal of the operational amplifier, and the other end of the fourth resistor is connected to the output terminal of the operational amplifier; one end of the fifth resistor is connected to the non-inverting input terminal of the operational amplifier; and the output terminal of the operational amplifier is connected to the control terminal of the barrier gate.

[0014] Furthermore, the power conversion module includes a buck DC-DC converter chip, an inductor, a sixth resistor, and a seventh resistor; the input terminal of the buck DC-DC converter chip is connected to the output terminal of the rectifier transformer, the ground terminal of the buck DC-DC converter chip is grounded, the output terminal of the buck DC-DC converter chip is connected to one end of the inductor, the other end of the inductor is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to the feedback terminal of the buck DC-DC converter chip and one end of the seventh resistor, the other end of the seventh resistor is grounded, and the other end of the inductor is connected to the power supply terminals of the first monostable multivibrator, the second monostable multivibrator, and the AND gate, respectively.

[0015] Furthermore, it also includes an indicator light module, an electronic control switch module, and a sound module. The other end of the inductor is connected to the positive terminal of the indicator light module and the positive terminal of the electronic control switch module, respectively. One end of the electronic control switch module is connected to the negative terminal of the indicator light module and the negative terminal of the electronic control switch module, respectively. The other end of the electronic control switch module is grounded. The control terminal of the electronic control switch module is connected to the output terminal of the signal amplifier.

[0016] The beneficial effect of adopting the above-mentioned further solution is that, by setting up an indicator light module, an electric control switch module, and a sound module, when the AND gate outputs a high-level signal, the electric control switch module is turned on, the indicator light module is powered on and illuminates, and the sound module is powered on and emits a sound to prompt personnel to pass through the barrier gate as soon as possible.

[0017] Furthermore, the electronically controlled switch module includes an eighth resistor and a MOSFET, which is an N-channel MOSFET. The output terminal of the signal amplifier is connected to the gate of the MOSFET, the other end of the eighth resistor is connected to the source of the MOSFET, the source of the MOSFET is grounded, the gate of the MOSFET is connected to the output terminal of the signal amplifier, and the drain of the MOSFET is connected to the negative terminal of the indicator light module and the negative terminal of the electronically controlled switch module. Attached Figure Description

[0018] Figure 1 This is a circuit structure block diagram of the present invention; Figure 2 The circuit diagram is for the first monostable multivibrator. Figure 3 The circuit diagram is for the second monostable multivibrator. Figure 4 This is the circuit diagram for a signal amplifier; Figure 5 This is the circuit diagram for the power conversion module; Figure 6 This is the circuit diagram of the electronically controlled switch module.

[0019] The attached diagram lists the components represented by each number as follows: 1. First monostable multivibrator; 2. Second monostable multivibrator; 3. AND gate; 4. Signal amplifier; 5. Rectifier transformer; 6. Power conversion module; 7. Barrier gate; 8. Indicator light module; 9. Electric control switch module; 10. Sound module; 11. License plate recognition device; 12. Access control card reader. Detailed Implementation

[0020] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0021] like Figure 1 As shown, this embodiment provides a logic control device for access control, including a first monostable multivibrator 1, a second monostable multivibrator 2, an AND gate 3, a rectifier transformer 5, and a power conversion module 6; wherein, the rectifier transformer 5 converts 220V AC mains power into 12V DC voltage.

[0022] The input terminal of the rectifier transformer 5 is connected to AC mains power, and the output terminal of the rectifier transformer 5 is connected to the input terminal of the power conversion module 6. The output terminal of the power conversion module 6 is connected to the power supply terminal of the first monostable multivibrator 1, the power supply terminal of the second monostable multivibrator 2, and the power supply terminal of the AND gate 3, respectively.

[0023] The input of the first monostable multivibrator 1 is connected to the output of the access control card reader 12, the input of the second monostable multivibrator 2 is connected to the output of the license plate recognizer 11, the output of the first monostable multivibrator 1 is connected to one input of the AND gate 3, the output of the second monostable multivibrator 2 is connected to the other input of the AND gate 3, and the output of the AND gate 3 is used to connect to the control terminal of the barrier gate 7.

[0024] In this embodiment of the invention, since the monostable multivibrator has an edge-triggered hold function, that is, when the input signal is high level or rising edge level signal, the output signal will remain high level for a period of time, thus achieving output signal hold. In this embodiment, two monostable multivibrators hold the license plate recognition signal output by the license plate recognizer 11 and the access card recognition signal output by the access card reader 12 for a period of time. During the holding time, license plate recognition and access card recognition can be performed separately, allowing personnel to perform license plate recognition and access card recognition operations separately within the signal holding time. The holding signals output by the two monostable multivibrators 1 are then passed through AND gate 3. If both the license plate recognition signal and the access card recognition signal are high-level signals during the signal holding time, it indicates that both license plate recognition and access card recognition have been successful, and AND gate 3 outputs a high-level signal. The high-level signal output by AND gate 3 controls the gate 7 to open, thereby realizing the integration of the environmental protection access control system and the enterprise's original access control system into one system to control the gate 7 to open. This satisfies the functions of the environmental protection access control system and the enterprise's original access control system while reducing the cost of building a new access control system.

[0025] Meanwhile, both monostable triggers have a signal hold function, which allows personnel to perform license plate recognition and access card recognition operations without any order. They only need to perform access card recognition or license plate recognition operations within the signal hold time of the monostable trigger after performing license plate recognition or access card recognition operations. This ensures that access card recognition and license plate recognition operations must be performed within a predetermined time. If the time is exceeded, the barrier gate cannot be opened.

[0026] In some embodiments, a signal amplifier 4 is also included. The input of the signal amplifier 4 is connected to the output of the AND gate 3, and the output of the signal amplifier 4 is used to connect to the control terminal of the barrier gate 7. By setting the signal amplifier 4, the driving capability of the output signal of the AND gate 3 can be improved; the signal amplifier 4 can amplify the output voltage of the AND gate 3, so that the signal controlling the barrier gate 7 can meet the triggering requirements of the barrier gate 7.

[0027] like Figure 2 As shown, in some embodiments, the first monostable multivibrator 1 includes a first integrated trigger chip U1, a first resistor R1, and a first capacitor C1. The external capacitor terminal of the first integrated trigger chip U1 is connected to one end of the first capacitor C1, the external resistor terminal of the first integrated trigger chip U1 is connected to the other end of the first capacitor C1, the external resistor terminal of the first integrated trigger chip U1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to the power supply terminal of the first integrated trigger chip U1, and the power supply terminal of the first integrated trigger chip U1 is connected to the output terminal of the power conversion module 6. The negative edge trigger input terminal of the first integrated trigger chip U1 is grounded, the positive edge trigger input terminal of the first integrated trigger chip U1 is connected to the output terminal of the access control card reader 12, and the non-phase output terminal of the first integrated trigger chip U1 is connected to one input terminal of the AND gate 3.

[0028] like Figure 3 As shown, the second monostable multivibrator 2 includes a second integrated trigger chip U2, a second resistor R2, and a second capacitor C2. The external capacitor terminal of the second integrated trigger chip U2 is connected to one end of the second capacitor C2, the external resistor terminal of the second integrated trigger chip U2 is connected to the other end of the second capacitor C2, the external resistor terminal of the second integrated trigger chip U2 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the power supply terminal of the second integrated trigger chip U2. The power supply terminal of the second integrated trigger chip U2 is connected to the output terminal of the power conversion module 6. The negative edge trigger input terminal of the second integrated trigger chip U2 is grounded, the positive edge trigger input terminal of the second integrated trigger chip U2 is connected to the output terminal of the license plate recognizer 11, and the non-phase output terminal of the second integrated trigger chip U2 is connected to the other input terminal of the AND gate 3. Both the first integrated trigger chip U1 and the second integrated trigger chip U2 are trigger chips of model 74121.

[0029] In this embodiment, by adjusting the resistor and capacitor corresponding to the monostable multivibrator, the signal hold time of the monostable multivibrator can be adjusted. The signal hold time is approximately equal to 0.7 times the resistance value and then the capacitance value. Therefore, the signal hold time of the monostable multivibrator can be set as needed.

[0030] In some embodiments, the resistance value of the first resistor R1 is equal to the resistance value of the second resistor R2, the capacitance of the first capacitor C1 is equal to the capacitance of the second capacitor C2, and the model number of the first integrated trigger chip U1 is the same as that of the second integrated trigger chip U2. With the above configuration, the output signal holding time of the first monostable trigger 1 and the second monostable trigger 2 is equal, ensuring that regardless of whether license plate recognition or access control recognition is performed first, the recognition holding signal remains equal. This unifies the recognition signal holding time, facilitating effective control of the entire entry and exit control recognition time.

[0031] like Figure 4 As shown, in some embodiments, the signal amplifier 4 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, and an operational amplifier U3. One end of the third resistor R3 is grounded, and the other end of the third resistor R3 is connected to the inverting input terminal of the operational amplifier U3. One end of the fourth resistor R4 is connected to the inverting input terminal of the operational amplifier U3, and the other end of the fourth resistor R4 is connected to the output terminal of the operational amplifier U3. One end of the fifth resistor R5 is connected to the non-inverting input terminal of the operational amplifier U3, and the output terminal of the operational amplifier U3 is connected to the control terminal of the barrier gate 7. The output voltage Vout of the operational amplifier U3 is 1 + R4 / R3Vin; Vin represents the output voltage of the AND gate, R4 represents the resistance value of the fourth resistor, and R3 represents the resistance value of the third resistor. Therefore, the amplification factor of the signal amplifier 4 can be adjusted by adjusting the resistance values ​​of the fourth and third resistors.

[0032] like Figure 5 As shown, the power conversion module 6 includes a step-down DC-DC converter chip U4, an inductor L1, a sixth resistor R6, and a seventh resistor R7. The input terminal of the step-down DC-DC converter chip U4 is connected to the output terminal of the rectifier transformer 5. The ground terminal of the step-down DC-DC converter chip U4 is grounded. The output terminal of the step-down DC-DC converter chip U4 is connected to one end of the inductor L1. The other end of the inductor L1 is connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 is connected to the feedback terminal of the step-down DC-DC converter chip U4 and one end of the seventh resistor R7. The other end of the seventh resistor R7 is grounded. The other end of the inductor L1 is connected to the power supply terminals of the first monostable multivibrator 1, the second monostable multivibrator 2, and the AND gate 3, respectively. By using the step-down DC-DC converter chip U4, the +12V output voltage of the rectifier transformer 5 is stepped down to obtain a +5V DC voltage, which is then used to power the various modules.

[0033] In some embodiments, the system further includes an indicator light module 8, an electric control switch module 9, and a sound module 10. The other end of the inductor L1 is connected to the positive terminals of both the indicator light module 8 and the electric control switch module 9. One end of the electric control switch module 9 is connected to both the negative terminals of both the indicator light module 8 and the electric control switch module 9. The other end of the electric control switch module 9 is grounded. The control terminal of the electric control switch module 9 is connected to the output terminal of the signal amplifier 4. By configuring the indicator light module 8, the electric control switch module 9, and the sound module 10, when the AND gate 3 outputs a high-level signal, the electric control switch module 9 is activated, the indicator light module 8 illuminates, and the sound module 10 emits a sound to prompt personnel to pass through the barrier gate as quickly as possible.

[0034] like Figure 6 As shown, in some embodiments, the indicator module 8 includes an LED, the sound module 10 includes a buzzer, and the electronic switch module 9 includes an eighth resistor R8 and a MOSFET Q1. The positive terminals of the LED and the buzzer are both connected to the other end of the inductor L1. The MOSFET Q1 is an N-channel MOSFET. The output terminal of the signal amplifier 4 is connected to the gate of the MOSFET Q1, the other end of the eighth resistor R8 is connected to the source of the MOSFET Q1, the source of the MOSFET Q1 is grounded, the gate of the MOSFET Q1 is connected to the output terminal of the voltage comparator 10, and the drain of the MOSFET Q1 is connected to the negative terminals of the LED and the buzzer. When the signal amplifier 4 outputs a high-level signal, the MOSFET Q1 is turned on. The negative terminals of the LED and the buzzer are both grounded through the MOSFET Q1, forming a current loop. The LED lights up and the buzzer sounds to remind personnel to pass through the barrier gate as soon as possible.

[0035] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the concept and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A logic control device for access control, characterized in that: It includes a first monostable multivibrator (1), a second monostable multivibrator (2), an AND gate (3), a rectifier transformer (5), and a power conversion module (6); The input terminal of the rectifier transformer (5) is connected to AC mains power, the output terminal of the rectifier transformer (5) is connected to the input terminal of the power conversion module (6), and the output terminal of the power conversion module (6) is connected to the power supply terminal of the first monostable multivibrator (1), the power supply terminal of the second monostable multivibrator (2), and the power supply terminal of the AND gate (3), respectively. The input of the first monostable multivibrator (1) is connected to the output of the access control card reader (12), the input of the second monostable multivibrator (2) is connected to the output of the license plate recognizer (11), the output of the first monostable multivibrator (1) is connected to one input of the AND gate (3), the output of the second monostable multivibrator (2) is connected to the other input of the AND gate (3), and the output of the AND gate (3) is used to connect to the control terminal of the barrier gate (7).

2. The logic control device for access control according to claim 1, characterized in that: It also includes a signal amplifier (4), the input of which is connected to the output of the AND gate (3), and the output of which is used to connect to the control terminal of the barrier gate (7).

3. The logic control device for access control according to claim 2, characterized in that: The first monostable multivibrator (1) includes a first integrated trigger chip (U1), a first resistor (R1), and a first capacitor (C1). The external capacitor terminal of the first integrated trigger chip (U1) is connected to one end of the first capacitor (C1), the external resistor terminal of the first integrated trigger chip (U1) is connected to the other end of the first capacitor (C1), the external resistor terminal of the first integrated trigger chip (U1) is connected to one end of the first resistor (R1), the other end of the first resistor (R1) is connected to the power supply terminal of the first integrated trigger chip (U1), and the power supply terminal of the first integrated trigger chip (U1) is connected to the output terminal of the power conversion module (6). The negative edge trigger input terminal of the first integrated trigger chip (U1) is grounded, the positive edge trigger input terminal of the first integrated trigger chip (U1) is connected to the output terminal of the access control card reader (12), and the non-phase output terminal of the first integrated trigger chip (U1) is connected to one input terminal of the AND gate (3).

4. The logic control device for access control according to claim 3, characterized in that: The second monostable multivibrator (2) includes a second integrated multivibrator chip (U2), a second resistor (R2), and a second capacitor (C2). The external capacitor terminal of the second integrated multivibrator chip (U2) is connected to one end of the second capacitor (C2), the external resistor terminal of the second integrated multivibrator chip (U2) is connected to the other end of the second capacitor (C2), the external resistor terminal of the second integrated multivibrator chip (U2) is connected to one end of the second resistor (R2), the other end of the second resistor (R2) is connected to the power supply terminal of the second integrated multivibrator chip (U2), and the power supply terminal of the second integrated multivibrator chip (U2) is connected to the output terminal of the power conversion module (6). The negative edge trigger input terminal of the second integrated multivibrator chip (U2) is grounded, the positive edge trigger input terminal of the second integrated multivibrator chip (U2) is connected to the output terminal of the license plate recognizer (11), and the non-phase output terminal of the second integrated multivibrator chip (U2) is connected to the other input terminal of the AND gate (3).

5. The logic control device for access control according to claim 4, characterized in that: The resistance value of the first resistor (R1) is equal to the resistance value of the second resistor (R2), the capacitance of the first capacitor (C1) is equal to the capacitance of the second capacitor (C2), and the model of the first integrated trigger chip (U1) is the same as that of the second integrated trigger chip (U2).

6. The logic control device for access control according to claim 5, characterized in that: Both the first integrated trigger chip (U1) and the second integrated trigger chip (U2) are trigger chips with the model number 74121.

7. The logic control device for access control according to claim 2, characterized in that: The signal amplifier (4) includes a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), and an operational amplifier (U3); one end of the third resistor (R3) is grounded, and the other end of the third resistor (R3) is connected to the inverting input terminal of the operational amplifier (U3); one end of the fourth resistor (R4) is connected to the inverting input terminal of the operational amplifier (U3), and the other end of the fourth resistor (R4) is connected to the output terminal of the operational amplifier (U3); one end of the fifth resistor (R5) is connected to the non-inverting input terminal of the operational amplifier (U3), and the output terminal of the operational amplifier (U3) is connected to the control terminal of the barrier gate (7).

8. The logic control device for access control according to claim 7, characterized in that: The power conversion module (6) includes a step-down DC-DC converter chip (U4), an inductor (L1), a sixth resistor (R6), and a seventh resistor (R7). The input terminal of the step-down DC-DC converter chip (U4) is connected to the output terminal of the rectifier transformer (5). The ground terminal of the step-down DC-DC converter chip (U4) is grounded. The output terminal of the step-down DC-DC converter chip (U4) is connected to one end of the inductor (L1). The other end of the inductor (L1) is connected to one end of the sixth resistor (R6). The other end of the sixth resistor (R6) is connected to the feedback terminal of the step-down DC-DC converter chip (U4) and one end of the seventh resistor (R7). The other end of the seventh resistor (R7) is grounded. The other end of the inductor (L1) is connected to the power supply terminal of the first monostable multivibrator (1), the power supply terminal of the second monostable multivibrator (2), and the power supply terminal of the AND gate (3), respectively.

9. The logic control device for access control according to claim 8, characterized in that: It also includes an indicator light module (8), an electronic control switch module (9), and a sound module (10). The other end of the inductor (L1) is connected to the positive terminal of the indicator light module (8) and the positive terminal of the electronic control switch module (9), respectively. One end of the electronic control switch module (9) is connected to the negative terminal of the indicator light module (8) and the negative terminal of the electronic control switch module (9), respectively. The other end of the electronic control switch module (9) is grounded. The control terminal of the electronic control switch module (9) is connected to the output terminal of the signal amplifier (4).

10. The logic control device for access control according to claim 9, characterized in that: The electronic control switch module (9) includes an eighth resistor (R8) and a MOS transistor (Q1). The MOS transistor (Q1) is an N-channel MOS transistor. The output terminal of the signal amplifier (4) is connected to the gate of the MOS transistor (Q1). The other end of the eighth resistor (R8) is connected to the source of the MOS transistor (Q1). The source of the MOS transistor (Q1) is grounded. The gate of the MOS transistor (Q1) is connected to the output terminal of the signal amplifier (4). The drain of the MOS transistor (Q1) is connected to the negative terminal of the indicator light module (8) and the negative terminal of the electronic control switch module (9).

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