Infrared induction access control circuit with smoke alarm function and system thereof

Abstract

According to the infrared induction access control circuit with the smoke alarm function and the system of the infrared induction access control circuit, the smoke detection sensing control circuit and the ACDC converter are electrically connected with the access controller, so that the access controller can automatically open a door when a person arrives at the position 3-5 m in front of the door, the use convenience of the access controller is improved, and the safety of the access controller is improved. A level conversion delay control module delays to provide a time for safe access of a person after door opening, the door is locked again after the delay is ended, a smoke detection sensing control module is arranged in an access control area to monitor smoke in real time, and when smoke or toxic gas generated by a fire is detected, an access control is triggered to open an electromagnetic lock, so that the door is opened. According to the smoke detection device, the smoke or toxic gas concentration can be adjusted and detected through the resistor RP1, the smoke detection threshold value can be flexibly adjusted, and timely photoelectric alarm can be carried out through the buzzer LS1.

Description

TECHNICAL FIELD

[0001] The utility model relates to access control system technical field more specifically, it is infrared induction access control circuit and system with smoke alarm function. BACKGROUND

[0002] With the development of modern technology, people's safety consciousness is constantly improved, and the security management level of community, housing or office area also increases, and the access control system is used more to increase the security of factory, office, apartment and dormitory, and to control the door and passage.

[0003] In the prior art, the existing access control is mostly through the mechanical pressing switch to give a signal to the access controller, and the access controller completes the unlocking and locking work after a period of time according to the unlocking signal. The access control lacks disaster prevention alarm function, which leads to the fact that if the door is not opened in time due to the delay of the alarm or the door cannot be opened, the safety of the users and the property in the factory will be affected.

[0004] Therefore, the utility model provides an infrared induction access control circuit and system with smoke alarm function which can detect gas in time and ensure safety. CONTENT OF UTILITY MODEL

[0005] The utility model discloses an infrared induction access control circuit and system with smoke alarm function which can detect gas in time and ensure safety.

[0006] An infrared induction access control circuit with smoke alarm function, comprising a human body infrared induction circuit, a level conversion delay control circuit, an access controller, an ACDC converter and a smoke detection sensor control circuit, wherein the output end of the human body infrared induction circuit is connected with the input end of the level conversion delay control circuit, the human body infrared induction circuit is used for sensing the infrared emission of human body and transmitting analog signals to the level conversion delay control circuit, the output end of the level conversion delay control circuit is connected with the input end of the access controller, the level conversion delay control circuit is used for converting analog signals into digital signals and triggering delay, the smoke detection sensor control circuit, the ACDC converter and the access controller are electrically connected, the ACDC converter is used for providing power supply for the access controller, and the smoke detection sensor control circuit is used for triggering the access control to open the electromagnetic lock and performing photoelectric alarm after detecting smoke or toxic gas.

[0007] Further, the smoke detection sensor control circuit comprises a smoke sensor MQ, a voltage comparator U1A, a voltage comparator U1B, an NPN transistor Q2, a PNP transistor Q1, a light emitting diode D1, a light emitting diode D2, a TL431 voltage stabilizer U2, an adjustable resistor RP1, the 2nd pin, the 1st pin and the 3rd pin of the smoke sensor MQ are connected to the positive pole of the power supply, the 5th pin of the smoke sensor MQ is connected to the negative pole of the power supply, the 4th pin and the 6th pin of the smoke sensor MQ are connected to the 3rd pin of the voltage comparator U1A, the 2nd pin of the voltage comparator U1A is connected to the center tap of the adjustable resistor RP1, the 1st pin of the voltage comparator U1A is connected to the inverting terminal of the 6th pin of the voltage comparator U1B, the light emitting diode D1 is connected between the 1st pin of the voltage comparator U1A and the inverting terminal of the 6th pin of the voltage comparator U1B, the 5th pin of the voltage comparator U1B is connected to the TL431 voltage stabilizer U2, the 7th pin of the voltage comparator U1B is connected to the base of the PNP transistor Q1, the light emitting diode D2 is arranged between the 7th pin of the voltage comparator U1B and the base of the PNP transistor Q1, the emitter of the transistor Q1 is connected to the positive pole of the power supply, the collector of the transistor Q1 is connected to the positive pole of the buzzer LS1 and the base of the NPN transistor Q2, the negative pole of the buzzer LS1 is connected to the negative pole of the power supply, the collector of the NPN transistor Q2 is connected to the positive pole of the power supply, and the emitter of the NPN transistor Q2 is connected to the negative pole of the power supply.

[0008] Further, the resistor R9 is arranged between the 5th pin of the smoke sensor MQ and the negative pole of the power supply, the resistor R9 limits the current to prevent the components from being burnt by excessive current, the resistor R8 and the capacitor C1 are arranged between the 4th pin and the 6th pin of the smoke sensor MQ and the 3rd pin of the voltage comparator U1A, one end of the resistor R8 and the capacitor C1 is connected to the 3rd pin of the voltage comparator U1A, and the other end of the resistor R8 and the capacitor C4 is connected to the negative pole of the power supply, the capacitor C1 filters the voltage, and the resistor R8 provides a lower bias current channel for the 3rd pin of the voltage comparator U1A.

[0009] Further, the resistor R4 is arranged between the 1st pin of the voltage comparator U1A and the inverting terminal of the 6th pin of the voltage comparator U1B, one end of the resistor R4 is connected to the positive pole of the power supply, and the other end of the resistor R4 is connected to the 1st pin of the voltage comparator U1A, the resistor R4 is a pull-up resistor for the 1st pin of the voltage comparator U1A, the resistor R1 is arranged between the light emitting diode D1 and the positive pole of the power supply, and the resistor R1 limits the current, the R terminal and the K terminal of the TL431 voltage stabilizer U2 are shorted, and the R terminal and the K terminal are respectively connected to the 5th pin of the voltage comparator U1B and one end of the resistor R3, and the other end of the resistor R3 is connected to the positive pole of the power supply.

[0010] Further, the pin 7 of the voltage comparator U1B is connected with the base of the PNP transistor Q1 through a resistor R5 and a resistor R7, one end of the resistor R5 is connected with the positive terminal of the power supply, the other end of the resistor R5 is connected with the base of the PNP transistor Q1, the resistor R5 is the pull-up resistor of the pin 7 of the voltage comparator U1B, one end of the resistor R7 is connected with the pin 7 of the voltage comparator U1B, the other end of the resistor R7 is connected with the base of the PNP transistor Q1, the resistor R7 is the current limiting resistor of the base of the PNP transistor Q1, the light emitting diode D2 is connected with the positive terminal of the power supply through a resistor R2, the resistor R2 is used for current limiting, one end of a resistor R6 is connected with the resistor R7, the base of the PNP transistor Q1 and the resistor R6, the other end of the resistor R6 is connected with the emitter of the PNP transistor Q1 and the positive terminal of the power supply, the resistor R6 is the bias resistor of the base of the PNP transistor Q1.

[0011] Further, the collector of the transistor Q1 is connected with the positive terminal of the buzzer LS1 through a resistor R10, the resistor R10 is the collector resistor of the PNP transistor Q1, the collector of the transistor Q1 is connected with the base of the NPN transistor Q2 through a resistor R11 and a resistor R12, the resistor R11 is the current limiting resistor of the base of the NPN transistor Q2, the resistor R12 is the bias resistor of the base, which provides a discharge channel of the capacitor between the base and the emitter of the NPN transistor Q2, the collector of the NPN transistor Q2 is connected with the positive terminal of the power supply through a resistor R13, the resistor R13 is the current limiting resistor of the collector of the Q2.

[0012] In some embodiments, the human body infrared sensing circuit includes an infrared sensing probe, an amplifier and a comparator, the output end of the infrared sensing probe is connected with the input end of the amplifier, the output end of the amplifier is connected with the input end of the comparator, and the output end of the comparator is connected with the input end of the level conversion and delay control circuit.

[0013] In some embodiments, a shaping filter circuit is further arranged between the output end of the amplifier and the input end of the comparator, which is used for shaping and filtering the output signal.

[0014] A control system, including human infrared induction module, level conversion delay control module, access controller, ACDC converter, smoke detection sensor control module, its characterized in that: human infrared induction module output and level conversion delay control module input connection, human infrared induction module is used to induct human infrared emission and transmit analog signal to level conversion delay control module, level conversion delay control module output and access controller input connection, level conversion delay control module is used to convert analog signal into digital signal and trigger delay, smoke detection sensor control module, ACDC converter and access controller electric connection, ACDC converter is used to provide power supply for access controller, smoke detection sensor control module is used to trigger access control to open electromagnetic lock and carry out photoelectric alarm after detecting smoke or toxic gas.

[0015] The utility model discloses an infrared induction access control circuit and system with smoke alarm function, human infrared induction module output and level conversion delay control module input connection, level conversion delay control module output and access controller input connection, smoke detection sensor control circuit, ACDC converter and access controller electric connection, so that the access controller can realize that human is in 3-5 meters of door and can automatically open the door, improve the convenience of access use, provide a personnel safety exit time after the delay of level conversion delay control module for opening the door, relock after the delay end, set up smoke detection sensor control module in the access area and carry out real -time monitoring to smoke, when detecting the smoke or toxic gas generated due to fire, trigger access control to open electromagnetic lock, improve personal access efficiency and access safety, adjust the concentration of detecting smoke or toxic gas through resistance RP1, flexibly adjust the threshold value of smoke detection, carry out timely photoelectric alarm through buzzer LS1. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the circuit schematic diagram of the smoke detection sensor control circuit of the application.

[0017] Figure 2 It is the structure schematic diagram of the human infrared induction access control system with illumination function of the application.

[0018] The following specific embodiments will further illustrate the utility model in conjunction with the above drawings. DETAILED DESCRIPTION

[0019] The following embodiments are described to assist in the understanding of the application, and the embodiments are not and should not be interpreted as limiting the protection scope of the application in any way.

[0020] In the following description, those skilled in the art will recognize that the discussion provided can be applicable to a variety of systems and articles of manufacture, and is not intended to limit the discussion to only the embodiments described. In the following description, those skilled in the art will recognize that components can be described as separate functional units (which can include sub-units), but those skilled in the art will recognize that various components or portions thereof can be divided into separate components, or can be integrated together (including integrated within a single system or component).

[0021] Also, connections between components or systems are not intended to be exclusive of each other. That is, a connection between components, or a system can be direct or indirect, wired or wireless, and can include a variety of connections such as physical, logical, electrical, and the like. Additionally, connections with other components or systems can be used. Embodiment 1

[0022] An infrared induction access control circuit with smoke alarm function, comprising a human body infrared induction circuit, a level conversion delay control circuit, an access controller, an ACDC converter, a smoke detection sensor control circuit, wherein the output end of the human body infrared induction circuit is connected with the input end of the level conversion delay control circuit, the human body infrared induction circuit is used for sensing human body infrared emission and transmitting analog signals to the level conversion delay control circuit, the output end of the level conversion delay control circuit is connected with the input end of the access controller, the level conversion delay control circuit is used for converting analog signals into digital signals and triggering delay, the smoke detection sensor control circuit and the ACDC converter are electrically connected with the access controller, the ACDC converter is used for providing power supply for the access controller, and the smoke detection sensor control circuit is used for triggering the access control to open the electromagnetic lock and perform photoelectric alarm after detecting smoke or toxic gas.

[0023] As Figure 1As shown, it is smoke detection sensor control circuit, the smoke detection sensor control circuit includes smoke sensor MQ, voltage comparator U1A, voltage comparator U1B, NPN transistor Q2, PNP transistor Q1, light emitting diode D1, light emitting diode D2, TL431 voltage stabilizer U2, adjustable resistor RP1, the 2 feet of smoke sensor MQ, 1 foot, 3 feet are connected with the positive pole of power supply, the 5 feet of smoke sensor MQ is connected with the negative pole of power supply, the 4 feet and 6 feet of smoke sensor MQ are connected with the 3 feet of voltage comparator U1A, the 2 feet of voltage comparator U1A are connected with the center tap end of adjustable resistor RP1, the 1 foot of voltage comparator U1A is connected with the inverting terminal of the 6 feet of voltage comparator U1B, the 1 foot of voltage comparator U1A is connected with the inverting terminal of the 6 feet of voltage comparator U1B, and the light emitting diode D1 is connected between the 1 foot of voltage comparator U1A and the 6 feet of voltage comparator U1B, the 5 feet of voltage comparator U1B is connected with TL431 voltage stabilizer U2, the 7 feet of voltage comparator U1B is connected with the base of PNP transistor Q1, the 7 feet of voltage comparator U1B is connected with the base of PNP transistor Q1, and the light emitting diode D2 is arranged between the 7 feet of voltage comparator U1B and the base of PNP transistor Q1, the emitter of transistor Q1 is connected to the positive terminal of power supply, the collector of transistor Q1 is connected with the positive terminal of buzzer LS1 and the base of NPN transistor Q2 respectively, the negative terminal of buzzer LS1 is connected to the negative terminal of power supply, the collector of NPN transistor Q2 is connected with the positive terminal of power supply, and the emitter of NPN transistor Q2 is connected with the negative terminal of power supply.

[0024] The 5-pin of the smoke sensor MQ is provided with a resistor R9 between the negative pole of the power supply, the resistor R9 functions as a current limiter to prevent excessive current from burning the components, the 4-pin and 6-pin of the smoke sensor MQ are provided with a resistor R8 and a capacitor C1 between the 3-pin of the voltage comparator U1A, one end of the resistor R8 and the capacitor C4 is connected to the 3-pin of the voltage comparator U1A, the other end of the resistor R8 and the capacitor C4 is connected to the negative pole of the power supply, the capacitor C1 functions as a filter, and the R8 provides a lower bias current channel for the 3-pin of the voltage comparator U1A; the 1-pin of the voltage comparator U1A is provided with a resistor R4 between the inverting terminal of the 6-pin of the voltage comparator U1B, one end of the resistor R4 is connected to the positive pole of the power supply, the other end of the resistor R4 is connected to the 1-pin of the voltage comparator U1A, the resistor R4 is a pull-up resistor for the 1-pin of the voltage comparator U1A, the resistor R1 is provided between the light emitting diode D1 and the positive pole of the power supply, the resistor R1 functions as a current limiter, the R end and the K end of the TL431 voltage stabilizer U2 are shorted and are connected to the 5-pin of the voltage comparator U1B and one end of the resistor R3 respectively, the other end of the resistor R3 is connected to the positive pole of the power supply; the 7-pin of the voltage comparator U1B is provided with a resistor R5 and a resistor R7 between the base of the PNP transistor Q1, one end of the resistor R5 is connected to the positive pole of the power supply, the other end of the resistor R5 is connected to the base of the PNP transistor Q1, the resistor R5 is a pull-up resistor for the 7-pin of the voltage comparator U1B, one end of the resistor R7 is connected to the 7-pin of the voltage comparator U1B, the other end of the resistor R7 is connected to the base of the PNP transistor Q1, the resistor R7 is a current limiting resistor for the base of the PNP transistor Q1, the resistor R2 is provided between the light emitting diode D2 and the positive pole of the power supply, the resistor R2 functions as a current limiter, one end of the resistor R6 is connected to the resistor R7, the base of the PNP transistor Q1 and the resistor R6, the other end of the resistor R6 is connected to the positive pole of the power supply through the emitter of the PNP transistor Q1, and the resistor R6 is a lower bias resistor for the base of the PNP transistor Q1; the collector of the transistor Q1 is provided with a resistor R10 between the positive terminal of the buzzer LS1, the resistor R10 is a collector resistor for the PNP transistor Q1, the collector of the transistor Q1 is provided with a resistor R11 and a resistor R12 between the base of the NPN transistor Q2, the resistor R11 is a current limiting resistor for the base of the NPN transistor Q2, the resistor R12 is a lower bias resistor for the base, which provides a discharge channel for the capacitor between the base and the emitter of the NPN transistor Q2, and the collector of the NPN transistor Q2 is provided with a resistor R13 between the positive pole of the power supply, the resistor R13 is a current limiting resistor for the collector of the NPN transistor Q2.

[0025] Specifically, when the smoke sensor MQ does not detect smoke or harmful gas, the 4th and 6th pins of the smoke sensor MQ output low-level signals, the voltage signal filtered by the capacitor C1 enters the 3rd pin of the voltage comparator U1A, the resistor RP1 provides a reference voltage for the 2nd pin of the voltage comparator U1A, and the detection concentration of smoke or toxic gas can be adjusted by adjusting the RP1 adjustable resistor; if the RP1 adjustable resistor is adjusted upwards, the voltage signal detected by the smoke sensor MQ needs to be relatively high to trigger the comparator U1A to output a high level; when no smoke or toxic gas is detected, the 1st pin of the voltage comparator U1A outputs a low level because the voltage at the 3rd pin of the voltage comparator U1A is lower than that at the 2nd pin.

[0026] When the smoke sensor MQ detects smoke or toxic gas, the 4th and 6th pins of the smoke sensor MQ output high levels, which enter the 3rd pin of the voltage comparator U1A and are compared with the reference voltage at the 2nd pin of the voltage comparator U1A; since the voltage at the 3rd pin of the voltage comparator U1A is higher than that at the 2nd pin of the voltage comparator U1A, the 1st pin of the voltage comparator U1A outputs a high level; at this time, the light-emitting diode D1 (safety indicator green light) is extinguished, the high-level voltage at the 1st pin of the voltage comparator U1A is directly sent to the 6th pin of the voltage comparator U1B, and is compared with the 5th pin of the voltage comparator U1B connected to the 2.5V reference voltage midpoint formed by the resistor R3 and the TL431 voltage stabilizer U2; since the voltage at the 6th pin of the voltage comparator U1B is higher than that at the 5th pin of the voltage comparator U1B, the 7th pin of the voltage comparator U1B outputs a low level, the light-emitting diode D2 (danger indicator red light) is lit, and at the same time, the PNP transistor Q1 is triggered to be turned on, the buzzer LS1 emits a sound alarm, and after the PNP transistor Q1 is turned on, the NPN transistor Q2 is positively biased to be turned on, the collector level of the NPN transistor Q2 is pulled low, and the gate control circuit is opened to open the electromagnetic lock through the low level.

[0027] The human body infrared sensing circuit comprises an infrared sensing probe, an amplifier and a comparator, the output end of the infrared sensing probe is connected with the input end of the amplifier, the output end of the amplifier is connected with the input end of the comparator, and the output end of the comparator is connected with the input end of the level conversion delay control circuit.

[0028] A shaping filter circuit is further arranged between the amplifier output end and the comparator input end, for shaping and filtering the output signal.

[0029] As Figure 2The application discloses a control system, which comprises a human body infrared induction module, a level conversion delay control module, an access controller, an ACDC converter and a smoke detection sensor control module, wherein the output end of the human body infrared induction module is connected with the input end of the level conversion delay control module, the human body infrared induction module is used for inducting human body infrared emission and transmitting analog signals to the level conversion delay control module, the output end of the level conversion delay control module is connected with the input end of the access controller, the level conversion delay control module is used for converting the analog signals into digital signals and triggering delay, the smoke detection sensor control module and the ACDC converter are electrically connected with the access controller, the ACDC converter is used for providing power supply for the access controller, and the smoke detection sensor control module is used for triggering the access controller to open an electromagnetic lock and perform photoelectric alarm after detecting smoke or toxic gas.

[0030] Although the present application has disclosed multiple aspects and embodiments, other aspects and embodiments will be apparent to those skilled in the art, and several modifications and improvements can be made without departing from the concept of the present application, which shall all fall within the scope of protection of the present application. The aspects and embodiments disclosed by the present application are only used for illustration, and are not intended to limit the present application, and the actual protection scope of the present application shall be subject to the claims.

Claims

1. An infrared sensing access control circuit with a smoke alarm function, comprising a human infrared sensing circuit, a level conversion delay control circuit, an access controller, an ACDC converter, and a smoke detection sensor control circuit, characterized in that: The output end of the human infrared sensing circuit is connected to the input end of the level conversion delay control circuit. The human infrared sensing circuit is used to sense the infrared emission of the human body and transmit the analog signal to the level conversion delay control circuit. The output end of the level conversion delay control circuit is connected to the input end of the access control controller. The level conversion delay control circuit is used to convert the analog signal into a digital signal and trigger the delay. The smoke detection sensor control circuit and the ACDC converter are electrically connected to the access control controller. The ACDC converter is used to provide power for the access control controller. The smoke detection sensor control circuit is used to trigger the access control to open the electromagnetic lock and issue a photoelectric alarm after detecting smoke or toxic gas.

2. The infrared sensing access control circuit with smoke alarm function according to claim 1, characterized in that: The smoke detection sensor control circuit includes a smoke sensor MQ, a voltage comparator U1A, a voltage comparator U1B, an NPN transistor Q2, a PNP transistor Q1, a light-emitting diode D1, a light-emitting diode D2, a TL431 voltage regulator U2, and an adjustable resistor RP1. Pins 2, 1, and 3 of the smoke sensor MQ are connected to the positive electrode of the power supply, and pin 5 of the smoke sensor MQ is connected to the negative electrode of the power supply. Pins 4 and 6 of the smoke sensor MQ are connected to pin 3 of the voltage comparator U1A, and pin 2 of the voltage comparator U1A is connected to the center tap end of the adjustable resistor RP1. Pin 1 of the voltage comparator U1A is connected to the inverting end of pin 6 of the voltage comparator U1B. A light-emitting diode D1 is connected between pin 1 of comparator U1A and the inverting end of pin 6 of voltage comparator U1B, pin 5 of voltage comparator U1B is connected to TL431 voltage regulator U2, pin 7 of voltage comparator U1B is connected to the base of PNP transistor Q1, and a light-emitting diode D2 is provided between pin 7 of voltage comparator U1B and the base of PNP transistor Q1. The emitter of transistor Q1 is connected to the positive terminal of power supply, the collector of transistor Q1 is connected to the positive terminal of buzzer LS1 and the base of NPN transistor Q2 respectively, the negative terminal of buzzer LS1 is connected to the negative terminal of power supply, the collector of NPN transistor Q2 is connected to the positive terminal of power supply, and the emitter of NPN transistor Q2 is connected to the negative terminal of power supply.

3. The infrared sensing access control circuit with smoke alarm function according to claim 1, characterized in that: A resistor R9 is provided between pin 5 of the smoke sensor MQ and the negative terminal of the power supply. Resistor R9 serves to limit current to prevent excessive current from burning out components. Resistor R8 and capacitor C1 are provided between pins 4 and 6 of the smoke sensor MQ and pin 3 of the voltage comparator U1A. One end of resistor R8 and capacitor C1 is connected to pin 3 of the voltage comparator U1A, and the other end of resistor R8 and capacitor C4 is connected to the negative terminal of the power supply. Capacitor C1 serves as a filter, and R8 provides a lower bias current channel for pin 3 of the voltage comparator U1A.

4. The infrared sensing access control circuit with smoke alarm function according to claim 1, characterized in that: A resistor R4 is provided between pin 1 of the voltage comparator U1A and the inverting end of pin 6 of the voltage comparator U1B. One end of the resistor R4 is connected to the positive end of the power supply, and the other end of the resistor R4 is connected to pin 1 of the voltage comparator U1A. The resistor R4 is a pull-up resistor for pin 1 of the voltage comparator U1A. A resistor R1 is provided between the light-emitting diode D1 and the positive end of the power supply. The resistor R1 serves as a current limiter. The R and K ends of the TL431 voltage regulator U2 are short-circuited and then connected to pin 5 of the voltage comparator U1B and one end of the resistor R3 respectively. The other end of the resistor R3 is connected to the positive end of the power supply.

5. The infrared sensing access control circuit with smoke alarm function as claimed in claim 1, characterized in that: Resistors R5 and R7 are provided between pin 7 of the voltage comparator U1B and the base of the PNP transistor Q1. One end of the resistor R5 is connected to the positive terminal of the power supply, and the other end of the resistor R5 is connected to the base of the PNP transistor Q1. Resistor R5 is a pull-up resistor of pin 7 of the voltage comparator U1B. One end of the resistor R7 is connected to pin 7 of the voltage comparator U1B, and the other end of the resistor R7 is connected to the base of the PNP transistor Q1. Resistor R7 is a current-limiting resistor for the base of the PNP transistor Q1. Resistor R2 is provided between the light-emitting diode D2 and the positive terminal of the power supply. Resistor R2 plays a current-limiting role. One end of the resistor R6 is connected to the resistor R7, the base of the PNP transistor Q1 and the resistor R6. The other end of the resistor R6 and the emitter of the PNP transistor Q1 are connected to the positive terminal of the power supply. Resistor R6 is a bias resistor on the base of the PNP transistor Q1.

6. The infrared sensing access control circuit with smoke alarm function as claimed in claim 2, characterized in that: A resistor R10 is provided between the collector of the transistor Q1 and the positive terminal of the buzzer LS1. The resistor R10 is the collector resistor of the PNP transistor Q1. Resistors R11 and R12 are provided between the collector of the transistor Q1 and the base of the NPN transistor Q2. R11 is the base current limiting resistor of the NPN transistor Q2. R12 is the base under-bias resistor, which provides a discharge channel for the capacitance between the base of the NPN transistor Q2 and the emitter of the NPN transistor Q2. A resistor R13 is provided between the collector of the NPN transistor Q2 and the positive terminal of the power supply. The resistor R13 is the collector current limiting resistor of Q2.

7. The infrared sensing access control circuit with smoke alarm function as claimed in claim 1, characterized in that: The human body infrared sensing circuit includes an infrared sensing probe, an amplifier, and a comparator. The output end of the infrared sensing probe is connected to the input end of the amplifier, the output end of the amplifier is connected to the input end of the comparator, and the output end of the comparator is connected to the input end of the level conversion delay control circuit.

8. The infrared sensing access control circuit with smoke alarm function as claimed in claim 7, characterized in that: A shaping filter circuit is also provided between the output end of the amplifier and the input end of the comparator, for shaping and filtering the output signal.

9. A control system, characterized in that: The infrared sensing access control circuit with a smoke alarm function comprises the infrared sensing module as described in any one of claims 1 to 8, comprising a human infrared sensing module, a level conversion delay control module, an access controller, an ACDC converter, and a smoke detection sensor control module, characterized in that: the output end of the human infrared sensing module is connected to the input end of the level conversion delay control module, the human infrared sensing module is used to sense the infrared emission of the human body and transmit the analog signal to the level conversion delay control module, the output end of the level conversion delay control module is connected to the input end of the access controller, the level conversion delay control module is used to convert the analog signal into a digital signal and trigger a delay, the smoke detection sensor control module, the ACDC converter are electrically connected to the access controller, the ACDC converter is used to provide power to the access controller, and the smoke detection sensor control module is used to trigger the access control to open the electromagnetic lock and perform a photoelectric alarm after detecting smoke or toxic gas.

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