Air valve control circuit, air valve controller and air valve control system

Abstract

The utility model provides an air valve control circuit, an air valve controller and an air valve control system, relates to the technical field of electronic circuits, and solves the problem of complex wiring of a control loop of an air valve in a ring control cabinet in the prior art. The stability of the air valve controller is improved, when the air valve controller is installed in the environmental control cabinet, compared with the related technology, the air valve controller does not need to occupy too large space in the cabinet, and the space occupation of the environmental control cabinet can be reduced; and moreover, wiring is simple, and loop debugging can be better carried out.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a valve control circuit, a valve controller, and a valve control system. Background Technology

[0002] When a fire occurs in enclosed spaces such as subway stations and tunnels, effective rescue and firefighting are difficult to carry out, which can easily lead to major accidents. Therefore, air dampers are usually required in these places. Air dampers can achieve air circulation and ventilation by supplying and exhausting air and regulating air volume, so as to switch between smoke exhaust and air supply.

[0003] However, in related technologies, the automatic control of air valves is achieved through corresponding air valve actuators, air valve limit switches, air valve motors, and air valve controllers to control their opening or closing. Moreover, the control circuit of the air valve controller is usually built using discrete components such as relays, contactors, and changeover switches inside the environmental control cabinet. The wiring inside the environmental control cabinet is complex, resulting in a large workload for the overall wiring and assembly of the circuit, and the circuit debugging is cumbersome and prone to errors. Utility Model Content

[0004] This application provides a valve control circuit, a valve controller, and a valve control system, which solves the problem of complex wiring of the control circuit of the valve in the environmental control cabinet in related technologies. This solution can build the control circuit of the valve through a highly integrated circuit, which can improve reliability and reduce the space occupied by the environmental control cabinet.

[0005] In a first aspect, this application provides a damper control circuit, which includes an MCU module, a digital input module, a digital output module, and a digital output module.

[0006] The input terminal of the digital input module is used to receive switching signals and / or execution feedback signals provided by external devices, and the output terminal of the digital input module is connected to the digital input terminal of the MCU module; the input terminal of the digital output module is connected to the damper control terminal of the MCU module, and the output terminal of the digital output module is used to output control signals to the controlled device; the input terminal of the digital output module is connected to the feedback output terminal of the MCU module, and the output terminal of the digital output module is used to output status signals to external devices.

[0007] Secondly, this application also provides a damper controller, including the damper control circuit as provided in the first aspect.

[0008] Thirdly, this application also provides a damper control system, which includes a PLC device, a damper actuator, a damper, a fan, and a damper controller as provided in the second aspect. The damper controller is connected to the PLC device, the damper controller is connected to the damper actuator, the damper actuator is connected to the damper, and the damper controller is connected to the fan.

[0009] The damper control circuit of this application can connect to external devices to receive corresponding signals and control the damper. The circuit exhibits high stability. When installed in an environmental control cabinet, it eliminates the need for discrete components and doesn't require excessive cabinet space. The circuit structure is simple and expandable to accommodate more external devices. Furthermore, the wiring of the damper control circuit is straightforward. Therefore, the stability of the damper controller using this circuit is improved. Compared to related technologies, when installed in an environmental control cabinet, the damper controller does not require excessive cabinet space, and the simple wiring facilitates better loop debugging. Attached Figure Description

[0010] Figure 1 A schematic block diagram of a damper control circuit provided in an embodiment of this application;

[0011] Figure 2 A schematic diagram of the circuit structure of a digital input module provided in an embodiment of this application;

[0012] Figure 3 A schematic diagram of the circuit structure of a digital output module provided in an embodiment of this application;

[0013] Figure 4 A schematic diagram of the circuit structure of a switch output module provided in an embodiment of this application;

[0014] Figure 5 This is a schematic diagram of the structure of a buckle provided in an embodiment of this application;

[0015] Figure 6 This is a schematic diagram of the base portion structure provided in one embodiment of this application;

[0016] Figure 7 This is a schematic diagram of the structure of a damper control system provided in an embodiment of this application. Detailed Implementation

[0017] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments of this application and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, the accompanying drawings only show the parts related to the embodiments of this application, not all structures. Those skilled in the art, after reading this specification, should be able to conceive that any combination of technical features can constitute an optional implementation method, provided that the technical features do not contradict each other.

[0018] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship. In the description of this application, "multiple" means two or more, and "several" means one or more.

[0019] Air dampers, used for supplying and exhausting air and regulating airflow to achieve air circulation and ventilation, are typically applied in enclosed environments to switch between smoke extraction and air supply. Automatic control of air dampers is achieved through damper actuators, limit switches, motors, and controllers, thereby controlling the opening and closing of the damper. In related technologies, the control circuit of the damper controller is usually built within an environmental control cabinet using discrete components such as relays, contactors, and changeover switches, and then wired within the cabinet to form the control circuit. However, the wiring within the environmental control cabinet is complex, the overall wiring and assembly of the circuit is labor-intensive, and the complex wiring within the cabinet reduces space utilization and system safety. Furthermore, errors are easily made during circuit debugging.

[0020] To address this issue, this application provides a damper control circuit that can receive corresponding signals to control the operation of the damper. Figure 1 The schematic diagram of a damper control circuit according to an embodiment of this application is shown in the figure. The damper control circuit includes an MCU (Microcontroller Unit) module 110, a digital input module 120, a digital output module 130, and a digital output module 140. It is conceivable that there can be multiple digital input modules 120, digital output modules 130, and digital output modules 140 to connect to different devices.

[0021] The input terminal of the digital input module 120 is used to receive switching signals and / or execution feedback signals provided by external devices, and the output terminal of the digital input module 120 is connected to the digital input terminal of the MCU module 110; the input terminal of the digital output module 130 is connected to the damper control terminal of the MCU module 110, and the output terminal of the digital output module 130 is used to output control signals to the controlled device; the input terminal of the digital output module 140 is connected to the feedback output terminal of the MCU module 110, and the output terminal of the digital output module 140 is used to output status signals to external devices.

[0022] Understandably, the digital input module 120 serves as a module in the damper control circuit that receives external signals. It can receive switch signals and / or execution feedback signals provided by external devices. For example, the damper control circuit connects to a PLC (Programmable Logic Controller) device through the digital input module 120. Based on this, from the perspective of the PLC device, it can send corresponding operation (such as open or close) commands to the damper through the damper control circuit. From the perspective of the damper control circuit, the damper control circuit receives the switch signal corresponding to the command through its digital input module 120, and then transmits it to the MCU module 110.

[0023] The switch output module 130, as the module in the damper control circuit that outputs control signals to the controlled device, outputs corresponding control signals to the controlled device based on the signals provided by the MCU module 110. For example, the damper control circuit connects to the fan or damper actuator through the switch output module 130, enabling the damper control circuit to control the fan and damper actuator, thereby achieving the function of air supply or smoke exhaust. The digital output module 140 is used to output status signals to external devices. For example, the damper controller connects to the PLC device through the digital output module 140, thereby feeding back corresponding status signals to the PLC device, such as signals related to the current on / off state of the damper.

[0024] As can be seen from the above scheme, the air valve control circuit can connect to external devices to receive corresponding signals and control the air valve. The circuit has high stability. When it is installed in the environmental control cabinet, it does not need to be built with discrete components in the cabinet, nor does it need to occupy too much space in the cabinet. The circuit structure is simple and can be expanded to connect more external devices. In addition, the wiring of the air valve control circuit is simple, which helps to better debug the circuit.

[0025] In some embodiments, the digital input module includes a signal input unit, an optocoupler, and a signal output unit. The input terminal of the signal input unit serves as the input terminal of the digital input module, the output terminal of the signal input unit is connected to the input terminal of the optocoupler, the input terminal of the signal output unit is connected to the output terminal of the optocoupler, and the output terminal of the signal output unit serves as the output terminal of the digital input module. It is understood that the digital input module achieves electrical signal isolation through the optocoupler. The signal input unit serves as the input-side unit of the optocoupler, and the signal output unit serves as the output-side unit of the optocoupler. The digital input module receives corresponding switching signals, which are then transmitted to the signal output unit via the optocoupler, and finally output to the MCU module via the signal output unit.

[0026] Optionally, in one embodiment, the signal access unit can provide corresponding voltage protection on the input side of the optocoupler and can realize signal transmission and isolation. The signal access unit includes a first resistor, a second resistor, a third resistor, a TVS (Transient Voltage Suppressor) transistor, a first capacitor, and a first diode. Specifically, the first end of the first resistor serves as the input terminal of the signal access unit, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor serves as the output terminal of the signal access unit. One end of the TVS transistor is connected to the second end of the first resistor, and the second end of the TVS transistor is grounded. The first end of the first capacitor is connected to the second end of the second resistor, and the second end of the first capacitor is grounded. The first diode and the third resistor are both connected in parallel with the first capacitor.

[0027] Understandably, the first and second resistors act as current-limiting resistors and, together with the third resistor, form a voltage divider structure to provide the appropriate voltage to the input terminal of the optocoupler, while the TVS diode stabilizes the voltage. Furthermore, the first capacitor and the third resistor form an RC parallel circuit to achieve signal transmission and isolation, preventing interference between signals. Moreover, the reverse connection of the first diode provides overvoltage protection at the input terminal of the optocoupler.

[0028] It should be noted that, in some embodiments, the signal access unit may also include multiple diodes to stabilize the voltage at the input terminal of the optocoupler by means of multiple diodes connected in reverse series.

[0029] Optionally, in one embodiment, the signal output unit includes a pull-up resistor and a second capacitor. Specifically, the first end of the pull-up resistor is connected to the operating voltage, the second end of the pull-up resistor is connected to the output terminal of the optocoupler, the first end of the second capacitor is connected to the second end of the pull-up resistor, and the second end of the second capacitor is grounded. The second capacitor acts as a filter, thereby stabilizing the voltage at the output terminal of the optocoupler.

[0030] It should be noted that in some embodiments, the signal access unit also includes a filter capacitor connected in parallel with the second capacitor, thereby improving the voltage stability of the output terminal of the optocoupler.

[0031] Figure 2 This is a schematic diagram of the circuit structure of a digital input module provided in an embodiment of this application. The digital input module includes a signal input unit, an optocoupler U1, and a signal output unit. The signal input unit includes a first resistor R1, a second resistor R2, a third resistor R3, a TVS diode D1, a first capacitor C1, and a first diode D2; the signal output unit includes a pull-up resistor R7 and a second capacitor C2.

[0032] Specifically, the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is connected to the input terminal of the optocoupler U1. One end of the TVS diode D1 is connected to the second end of the first resistor R1, and the second end of the TVS diode D1 is grounded. The first end of the first capacitor C1 is connected to the second end of the second resistor R2, and the second end of the first capacitor C1 is grounded. The first diode D2 and the third resistor R3 are both connected in parallel to the first capacitor C1. The first end of the pull-up resistor R7 is connected to the operating voltage, and the second end of the pull-up resistor R7 is connected to the output terminal of the optocoupler U1. The first end of the second capacitor C2 is connected to the second end of the pull-up resistor R7, and the second end of the second capacitor C2 is grounded.

[0033] Understandably, resistors R1 and R2 act as current-limiting resistors, forming a voltage divider with resistor R3 to provide the appropriate voltage to the input of optocoupler U1, while TVS diode D1 stabilizes the voltage. Furthermore, capacitor C1 and resistor R3 form an RC parallel circuit to achieve signal transmission and isolation, preventing interference between signals. The reverse connection of diode D2 provides overvoltage protection at the input of optocoupler U1. Capacitor C2 acts as a filter, thus stabilizing the output voltage of optocoupler U1.

[0034] In practical applications, when the first resistor R1 is connected to a high-level switching signal or execution feedback signal, the input terminal of the optocoupler U1 can be connected to a high-level signal. Therefore, the light source (such as a light-emitting diode) on the input side of the optocoupler U1 is in a conducting state (emitting light) so that the light receiver (such as a phototransistor) on the output side of the optocoupler U1 receives the light signal, thereby pulling down the potential of the output terminal of the optocoupler U1, thus providing a low-level signal for the MCU module.

[0035] Figure 3This is a schematic diagram of the circuit structure of a digital output module according to an embodiment of this application. In one embodiment, the digital output module includes a solid-state relay U2 and a fourth resistor R4. The input terminal of the solid-state relay U2 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 serves as the input terminal of the digital output module, connecting to an output interface on the MCU module. Conversely, the output terminal of the solid-state relay U2 serves as the output terminal of the digital output module.

[0036] As can be understood, the solid-state relay U2 is a MOSFET output optocoupler, whose basic structure is equivalent to a light emitter (such as an LED) and a light receiver (usually a MOSFET). When the LED at the input receives an electrical signal, it emits light of a corresponding intensity. This light signal passes through the dielectric layer of the optocoupler and reaches the photosensitive area of ​​the photoreceiver (MOSFET). The photosensitive element in the photosensitive area (usually a photodiode or phototransistor) receives the light signal and generates a corresponding current or voltage change, thereby driving the gate of the MOSFET. When the gate of the MOSFET receives the current or voltage change generated by the light signal, a conductive path is formed between the source and drain of the MOSFET. In this way, the electrical signal at the input is converted into an electrical signal at the output through the optical signal, achieving signal isolation and transmission.

[0037] Therefore, digital output modules can achieve fast response speeds and avoid mechanical wear issues through solid-state relays. Moreover, solid-state relays can quickly and accurately respond to and cut off circuits during equipment control, thereby protecting electrical equipment and preventing equipment damage or malfunction.

[0038] Figure 4 The circuit structure diagram of a switching output module provided in one embodiment of this application is shown in the figure. The switching output module includes a power relay U3, a fifth resistor R5, a sixth resistor R6, an NPN transistor Q1, and a second diode D3. Specifically, the first end of the fifth resistor R5 serves as the input terminal of the switching output module, the second end of the fifth resistor R5 is connected to the base terminal of the NPN transistor Q1, the emitter terminal of the NPN transistor Q1 is grounded, and the two ends of the sixth resistor R6 are respectively connected to the base terminal and the emitter terminal of the NPN transistor Q1. The collector terminal of the NPN transistor Q1 is connected to the control terminal of the power relay U3, the anode terminal of the second diode D3 is connected to the collector terminal of the NPN transistor Q1, and the cathode terminal of the second diode D3 and the power supply terminal of the power relay U3 are both connected to the operating voltage. Both output terminals of the power relay U3 serve as the output terminals of the switching output module.

[0039] Understandably, when the fifth resistor R5 receives a high-level signal, the NPN transistor Q1 meets the conduction condition due to the voltage division effect of the fifth resistor R5 and the sixth resistor R6, and thus becomes conductive. This allows the control terminal of the power relay U3 to receive a low-level signal, thereby turning on the power relay U3. For example, the power controller is connected to the damper actuator and the corresponding power supply at both ends. When the power relay U3 is on, the damper actuator can be powered on and begin controlling the opening and closing of the damper. The reverse-connected second diode D3 prevents the power controller from being turned on by the operating voltage when no signal from the MCU module is received. Therefore, through the switch output module, the damper control circuit can control the controlled device. The circuit structure is simple and reliable, which helps improve the reliability of control and reduces the difficulty of debugging.

[0040] This application also provides a damper controller, which includes the damper control circuit as described in the above embodiments, such as a circuit board or PCB (Printed Circuit Board). The damper controller can then connect to corresponding devices, such as a PLC, a fan, or a damper actuator, to control the opening and closing of the damper. Furthermore, because the damper controller uses integrated circuits, its stability is improved. When installed in an environmental control cabinet, compared to related technologies, it does not require excessive space within the cabinet, and its wiring is simple, facilitating easier debugging.

[0041] In one embodiment, the damper controller adopts a split design, comprising a main body, a display panel, a base, and a fixing clip. The main body houses the aforementioned circuit board (or PCB board, etc.) to house the damper control circuitry. Furthermore, the main body is communicatively connected to the display panel, for example, via a port on the display panel connected to the circuit board to exchange signals. It is conceivable that the circuit board also includes a circuit module for communication with the display panel. Optionally, in one embodiment, the two are connected via a wired connection, where the circuit board can connect to the port on the display panel via an RS485 communication module. Alternatively, in another embodiment, the two are connected wirelessly, where the circuit board can be equipped with a wireless communication module (such as a Bluetooth module) connected to the communication module on the display panel to achieve communication.

[0042] Furthermore, the base and the mounting clips are connected using a snap-fit ​​method. The mounting clips can be fixed in their installation position within the environmental control cabinet. The mounting clips secure the base in place. The base can be detachably connected to the main body of the device, using methods such as bolts and threaded holes or snap-fit ​​connections to secure them. Several ports are provided on the base for connecting to external devices. It's conceivable that the circuitry is located in the main body of the device, while the ports are located on the base. Connections between the ports and the circuit board are achieved via corresponding pins to input or output signals. Moreover, the external ports are less prone to damage. Separating them from the circuitry onto different components helps reduce the complexity of the debugging process, and concentrating the ports on the base also facilitates wiring within the environmental control cabinet.

[0043] In one embodiment, the base 300 and the fixing buckle 200 are detachably connected through a corresponding buckle structure, such as... Figure 5 As shown, Figure 5 The figure shows a schematic diagram of the buckle structure provided in an embodiment of the present application. The buckle 200 has a hollow portion, and elongated protrusions 210 are provided on both sides of the buckle 200. A pair of limiting strips 220 are provided in the hollow portion of the buckle 200, and cylindrical protrusions 221 are provided at the ends of the limiting strips 220.

[0044] Figure 6 The figure shows a schematic diagram of the base structure provided in an embodiment of this application. The base 300 is provided with a limiting block 310 and two guide rails 320 adapted to the elongated protrusion 210. The limiting block 310 is located between the two guide rails 320. The maximum width of the limiting block 310 is greater than the distance between the ends of the two limiting bars 220.

[0045] It is conceivable that during the installation of the air valve controller in the environmental control cabinet, the fixing buckle 200 can be installed in the installation position first, and then the base 300 can be connected to the fixing buckle 200. That is, the guide rail 320 is connected to the elongated protrusion 210 on the fixing buckle 200, so that the elongated protrusion 210 gradually embeds itself along the guide rail 320. During this process, the limiting block 310 gradually falls between the cylindrical protrusions 221 of the two limiting bars 220. Finally, when the elongated protrusion 210 on the fixing buckle 200 is completely embedded in the guide rail 320, the limiting block 310 is locked between the corresponding cylindrical protrusions 221 of the two limiting bars 220. It can be understood that the position of the corresponding cylindrical protrusions 221 of the two limiting bars 220 is beyond the maximum width of the limiting block 310, thereby limiting the relative position of the fixing buckle 200 and the base 300 and preventing the base 300 from falling off the fixing buckle 200.

[0046] It should be noted that, referring to Figure 4 As shown, in some embodiments, the fixing buckle 200 further includes an elastic limiting piece 230. The elastic limiting piece 230 is located in the hollow portion of the fixing buckle 200 and is disposed opposite to the limiting strip 220. The elastic limiting piece 230 and the inner sidewall of the hollow portion of the fixing buckle 200 have a preset angle. It is conceivable that, since the elastic limiting piece 230 is inclined, as the elongated protrusion 210 on the fixing buckle 200 gradually inserts along the guide rail 320 on the base 300, the elastic limiting piece 230 moves past the limiting block 310 as the movement progresses, that is, it moves from one side of the limiting block 310 to the other side and can abut against the limiting block 310, thereby further restricting the relative position of the fixing buckle 200 and the base 300 and preventing the base 300 from falling off the fixing buckle 200.

[0047] This application also provides a damper control system, such as... Figure 7 As shown, Figure 7 This is a schematic diagram of a damper control system provided in an embodiment of this application. The damper control system includes a PLC device 410, a damper actuator 420, a damper 430, a fan 440, and a damper controller 450 as described above. The damper controller 450 is connected to the PLC device 410, the damper actuator 420, the damper 430, and the fan 440. It is understood that the damper controller 450 is connected to the PLC device 410 through a switch input module in its damper control circuit to receive the switch signal issued by the PLC device 410 to operate the damper 430. Additionally, the damper controller 450 is also connected to the damper actuator 420 through another switch input module in its damper control circuit to receive execution feedback signals such as the status signal fed back by the damper actuator 420 after completing its action.

[0048] Furthermore, the damper controller 450 is connected to the PLC device 410 via its digital output module in the damper control circuit to provide feedback to the PLC device 410 on status signals such as the status of the damper 430. Of course, the damper controller 450 is also connected to the damper actuator 420 via its digital output module to control the operation of the damper actuator 420. Moreover, the damper controller 450 is also connected to the fan 440 via another digital output module to control the operation of the fan 440. Therefore, the damper control system of this solution can solve the problem of complex wiring in the control loop of the damper 430 within the environmental control cabinet. It can construct the control loop of the damper 430 through highly integrated circuitry, improving reliability while reducing the space occupied by the environmental control cabinet.

[0049] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0050] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of this application, the scope of which is determined by the scope of the appended claims.

Claims

1. A damper control circuit, characterized by, The MCU module, the switch quantity input module, the switch quantity output module and the digital quantity output module are included. The input end of the switch quantity input module is used for accessing the switch signal provided by the external device and / or executing the feedback signal, and the output end of the switch quantity input module is connected with the switch quantity access end of the MCU module. The input end of the switch quantity output module is connected with the air valve control end of the MCU module, and the output end of the switch quantity output module is used for outputting the control signal to the controlled device. The input end of the digital quantity output module is connected with the feedback output end of the MCU module, and the output end of the digital quantity output module is used for outputting the state signal to the external device.

2. The damper control circuit of claim 1, wherein, The switch quantity input module includes a signal access unit, an optoelectronic coupler and a signal output unit. The input end of the signal access unit is used as the input end of the switch quantity input module, the output end of the signal access unit is connected with the input end of the optoelectronic coupler, the input end of the signal output unit is connected with the output end of the optoelectronic coupler, and the output end of the signal output unit is used as the output end of the switch quantity input module.

3. The damper control circuit of claim 2, wherein, The signal access unit includes a first resistor, a second resistor, a third resistor, a TVS tube, a first capacitor and a first diode. The first end of the first resistor is used as the input end of the signal access unit, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is used as the output end of the signal access unit. One end of the TVS tube is connected with the second end of the first resistor, the second end of the TVS tube is grounded, the first end of the first capacitor is connected with the second end of the second resistor, the second end of the first capacitor is grounded, and the first diode and the third resistor are connected in parallel with the first capacitor.

4. The damper control circuit of claim 1 or 2, wherein, The digital quantity output module includes a solid-state relay and a fourth resistor, the input end of the solid-state relay is connected with the fourth resistor, and the output end of the solid-state relay is used as the output end of the digital quantity output module.

5. The damper control circuit of claim 1 or 2, wherein, The switch quantity output module includes a power relay, a fifth resistor, a sixth resistor, an NPN triode and a second diode. The first end of the fifth resistor is used as the input end of the switch quantity output module, the second end of the fifth resistor is connected with the base end of the NPN triode, the emitter end of the NPN triode is grounded, and the two ends of the sixth resistor are respectively connected with the base end and the emitter end of the NPN triode. The collector end of the NPN triode is connected with the control end of the power relay, the anode end of the second diode is connected with the collector end of the NPN triode, the cathode end of the second diode and the power supply end of the power relay are both connected with the working voltage, and the two output ends of the power relay are both used as the output end of the switch quantity output module.

6. A wind valve controller characterized by, The wind valve control circuit includes the wind valve control circuit according to any one of claims 1-5.

7. The damper controller of claim 6, wherein, The wind valve controller further includes a device body, a display panel, a base and a fixing buckle. The device body is communicatively connected with the display panel, and a circuit board is arranged in the device body. The circuit board is provided with the wind valve control circuit. The base is detachably connected with the device body, the base comprises a plurality of ports connected with external devices, and the fixing buckle is used for clamping and fixing the base.

8. The damper controller of claim 7, wherein, The fixing buckle is provided with long strip-shaped protrusions on both sides, and a pair of limiting strips are arranged in the hollow part of the fixing buckle, and the end of the limiting strip is provided with a cylindrical protrusion; The base is provided with a limiting block and two guide rails adapted to the long strip-shaped protrusions, the limiting block is located between the two guide rails, and the maximum width of the limiting block is greater than the distance between the ends of the two limiting strips, so that the limiting block is clamped between the corresponding cylindrical protrusions of the two limiting strips when the long strip-shaped protrusions on the fixing buckle are completely embedded in the guide rails.

9. The damper controller of claim 8, wherein, The fixing buckle further comprises a elastic limiting sheet, the elastic limiting sheet is located in the hollow part of the fixing buckle and is arranged opposite to the limiting strip, and the elastic limiting sheet and the inner side wall of the hollow part of the fixing buckle have a preset angle of the included angle.

10. A damper control system, characterized by, The air valve control system comprises a PLC device, an air valve execution device, an air valve, a fan and the air valve controller according to any one of claims 6-9, the air valve controller is connected with the PLC device, the air valve controller is connected with the air valve execution device, the air valve execution device is connected with the air valve, and the air valve controller is connected with the fan.

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