Multi-motor air duct control circuit and air duct

Abstract

The utility model discloses a multi-motor air duct control circuit and an air duct, the air duct comprises a plurality of motors, and the multi-motor air duct control circuit comprises a plurality of motor fault detection circuits used for detecting the operation states of the plurality of motors in a one-to-one manner and outputting motor detection signals; the plurality of main control circuits are in one-to-one connection with the plurality of motor fault detection circuits, and the main control circuits are used for outputting stop control signals when motor faults are determined according to the motor detection signals; and the multiple motor driving circuits are connected with the multiple main control circuits in a one-to-one mode, the driving ends of the multiple motor driving circuits are used for being connected with the multiple motors in a one-to-one mode, and the motor driving circuits are used for controlling the motors to stop working when receiving the stop control signals. According to the utility model, the problem that the flexibility and durability of the air ducts are limited when the air ducts of a plurality of motors are simultaneously closed or opened is solved.

Description

Technical Field

[0001] This utility model relates to the field of ventilation ducts, and in particular to a multi-motor ventilation duct control circuit and a ventilation duct. Background Technology

[0002] Hair dryers have long been an indispensable appliance in people's lives. Now, hair dryers have developed into various types and functions. In order to increase the air volume of the hair dryer, the number of motors in the hair dryer will be increased.

[0003] The multiple motors in the ventilation duct are turned off or on simultaneously. If one motor fails, the ventilation duct will not work. Furthermore, individual motor control cannot be set, which limits the flexibility and durability of multi-motor ventilation ducts. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a multi-motor duct control circuit and duct to solve the problem that the simultaneous closing or opening of multiple motor ducts limits the flexibility and durability of the duct.

[0005] The technical solution of this utility model is as follows:

[0006] A multi-motor ventilation duct control circuit, wherein the ventilation duct includes multiple motors, and the multi-motor ventilation duct control circuit includes:

[0007] Multiple motor fault detection circuits are used to detect the operating status of multiple motors one-to-one and output motor detection signals;

[0008] Multiple main control circuits are connected one-to-one with multiple motor fault detection circuits. The main control circuits are used to output a stop control signal when a motor fault is determined based on the motor detection signal.

[0009] Multiple motor drive circuits are connected one-to-one with multiple main control circuits. The drive terminals of the multiple motor drive circuits are used to connect one-to-one with multiple motors. The motor drive circuits are used to drive the motors to stop working when they receive the stop control signal.

[0010] Optionally, the multi-motor duct control circuit further includes:

[0011] A bus voltage detection circuit is provided, wherein the detection terminal of the bus voltage detection circuit is used to connect to the voltage bus, and the output terminal of the bus voltage detection circuit is connected to multiple main control circuits. The bus voltage detection circuit is used to detect the bus voltage and output the bus voltage detection signal to multiple main control circuits.

[0012] Optionally, the bus voltage detection circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first capacitor. The first end of the first resistor is the detection terminal of the bus voltage detection circuit. The second end of the first resistor is connected to the first end of the second resistor. The second end of the second resistor, the first end of the third resistor, and the first end of the fourth resistor are interconnected. The second end of the fourth resistor is connected to the first end of the first capacitor and is the output terminal of the bus voltage detection circuit. The second end of the third resistor and the second end of the first capacitor are grounded.

[0013] Optionally, the air duct includes multiple heating wires, and the multi-motor air duct control circuit includes:

[0014] Multiple heating wire drive circuits are connected one-to-one with multiple main control circuits. The heating wire drive circuit is used to drive the heating wire to work when it receives the heating wire working signal output by the main control circuit.

[0015] Optionally, the multi-motor duct control circuit further includes:

[0016] The selection button is connected to multiple main control circuits. When the selection button is triggered, it outputs a selection trigger signal to one or more of the main control circuits. When the main control circuit receives the selection trigger signal, it outputs a working signal to the motor drive circuit.

[0017] Optionally, the multi-motor duct control circuit further includes:

[0018] A wireless communication circuit is used to connect to an external terminal. The output terminal of the wireless communication circuit is connected to the input terminals of multiple main control circuits. The wireless communication circuit is used to output the wireless control signal output by the external terminal to the multiple main control circuits.

[0019] The main control circuit is used to output motor control signals to the motor drive circuit according to the wireless control signals.

[0020] Optionally, the multi-motor duct control circuit further includes:

[0021] The display circuit has its input terminal connected to the output terminals of the multiple main control circuits. The main control circuits are used to control the display circuit to operate when outputting motor control signals to the motor drive circuit.

[0022] Optionally, the multi-motor duct control circuit further includes:

[0023] An alarm circuit is provided, the input of which is connected to the output of multiple main control circuits; the main control circuits are used to control the alarm circuit to operate when a motor fault is determined based on the motor detection signal.

[0024] Optionally, the multi-motor duct control circuit further includes:

[0025] The power supply circuit has its output terminal connected to the power supply terminals of the plurality of motor fault detection circuits, the plurality of main control circuits, and the plurality of motor drive circuits. The power supply circuit is used to provide operating voltage to the plurality of motor fault detection circuits, the plurality of main control circuits, and the plurality of motor drive circuits.

[0026] This utility model also proposes a ventilation duct, including multiple motors and a multi-motor ventilation duct control circuit as described above, wherein the multiple motors are connected one-to-one with multiple motor drive circuits in the multi-motor ventilation duct control circuit.

[0027] This utility model's technical solution comprises a multi-motor ventilation duct control circuit consisting of multiple motor fault detection circuits, multiple main control circuits, and multiple motor drive circuits. The multiple motor fault detection circuits detect the operating status of multiple motors one-to-one and output motor detection signals to multiple main control circuits, which are connected one-to-one with each of the motor fault detection circuits. When a motor fault is determined based on the motor detection signals, the main control circuits output stop control signals to the multiple motor drive circuits, which are also connected one-to-one with each of the main control circuits. The drive terminals of the multiple motor drive circuits are also used to connect to multiple motors one-to-one. Upon receiving the stop control signal, the motor drive circuits control the motors to stop operating. Thus, this solution can detect multiple motors through multiple motor fault detection circuits. When a motor fault is detected, the main control circuits can output stop control signals to the multiple motor drive circuits to stop the faulty motor. The design of multiple main control circuits allows each motor to be controlled independently, preventing a situation where a fault in one motor causes the others to malfunction, increasing the service life of the ventilation duct and thus enhancing its flexibility and durability. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1This is a functional module schematic diagram of an embodiment of the multi-motor fan duct control circuit of this utility model.

[0030] Figure 2 This is a schematic diagram of the circuit structure of the main control circuit in the multi-motor fan duct control circuit of this utility model.

[0031] Figure 3 This is a schematic diagram of the circuit structure of the motor drive circuit in the multi-motor fan duct control circuit of this utility model.

[0032] Figure 4 This is a schematic diagram of the bus voltage detection circuit in an embodiment of the multi-motor fan duct control circuit of this utility model.

[0033] Figure 5 This is a schematic diagram of the heating wire drive circuit in an embodiment of the multi-motor fan duct control circuit of this utility model.

[0034] Figure 6 This is a functional module schematic diagram of another embodiment of the multi-motor fan duct control circuit of this utility model.

[0035] Figure 7 This is a schematic diagram of the circuit structure of the display circuit in the multi-motor fan duct control circuit of this utility model.

[0036] Explanation of reference numerals in the attached diagram: 10, Motor fault detection circuit; 20, Main control circuit; 30, Motor drive circuit; 40, Selection button; 50, Wireless communication circuit; 60, Display circuit; 70, Alarm circuit; R1, First resistor; R2, Second resistor; R3, Third resistor; R4, Fourth resistor; C1, First capacitor. Detailed Implementation

[0037] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the present utility model 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 present utility model and are not intended to limit the present utility model.

[0038] In the implementation methods and claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of this utility model involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0039] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when an element is referred to as "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements present. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0040] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0041] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0042] Hair dryers have long been an indispensable appliance in people's lives. Now, hair dryers have developed into various types and functions. In order to increase the air volume of the hair dryer, the number of motors in the hair dryer will be increased.

[0043] The multiple motors in the ventilation duct are turned off or on simultaneously. If one motor fails, the ventilation duct will not work. Furthermore, individual motor control cannot be set, which limits the flexibility and durability of multi-motor ventilation ducts.

[0044] To solve the above problems, this utility model proposes a multi-motor ventilation duct control circuit, wherein the ventilation duct includes multiple motors.

[0045] Reference Figure 1 In one embodiment, the multi-motor duct control circuit includes:

[0046] Multiple motor fault detection circuit 10 is used to detect the operating status of multiple motors one-to-one and output motor detection signals;

[0047] Multiple main control circuits 20 are connected one-to-one with multiple motor fault detection circuits 10. The main control circuit 20 is used to output a stop control signal when a motor fault is determined based on the motor detection signal.

[0048] Multiple motor drive circuits 30 are connected one-to-one with multiple main control circuits 20. The drive ends of the multiple motor drive circuits 30 are used to connect multiple motors one-to-one. The motor drive circuits 30 are used to drive the motors to stop working when they receive the stop control signal.

[0049] In this embodiment, the motor fault detection circuit 10 may include circuits for detecting motor operating parameters and components. For example, a vibration sensor may be used to monitor the motor's vibration. A normally operating motor should vibrate within a certain range; if the vibration exceeds this range, it may indicate a fault, such as imbalance, misalignment, or bearing wear. A temperature sensor may be used to monitor the motor's temperature; a current sensor may be used to monitor the motor's operating current; and the motor's speed may be monitored to ensure it remains within the normal range. Other detection circuits can be added based on actual conditions and user requirements for motor fault detection; this embodiment does not impose any limitations on these. The main control circuit 20 may consist of a controller and electronic components such as resistors and capacitors. The controller may be a digital signal processor (DSP), a programmable logic device (PLD), a field-programmable gate array (FPGA), a microprocessor, an MCU, or other electronic components. The specific circuit structure of the main control circuit 20 can be referenced. Figure 2 Configure settings. Figure 2 The driving motor is a three-phase motor. Figure 2 The drive circuit in the diagram is for driving one phase of a three-phase motor, where V represents one phase. The drive circuits for the other two phases have the same structure. The motor drive circuit 30 can be composed of a motor drive chip and electronic components such as capacitors and resistors. The specific circuit structure of the motor drive circuit 30 can be found in [reference needed]. Figure 3 Configure settings. Figure 3 The KEY can be a control signal or input used to receive user input or commands to control the motor's operating status; and Figure 3This is a motor drive circuit 30 for one motor. Thus, when the main control circuit 20 determines a motor fault based on the motor detection signal, it outputs a stop control signal to the corresponding motor drive circuit 30, thereby driving the corresponding motor to stop working. In this embodiment, the design of multiple main control circuits 20 allows each circuit to independently control multiple motors, preventing a single motor failure from causing the others to malfunction. This increases the lifespan of the ventilation duct, thereby enhancing its flexibility and durability.

[0050] This utility model's technical solution comprises a multi-motor ventilation duct control circuit consisting of multiple motor fault detection circuits 10, multiple main control circuits 20, and multiple motor drive circuits 30. The multiple motor fault detection circuits 10 are used to detect the operating status of multiple motors one-to-one and output motor detection signals to the multiple main control circuits 20. The multiple main control circuits 20 are connected one-to-one with the multiple motor fault detection circuits 10. When a motor fault is determined based on the motor detection signals, the main control circuits 20 output stop control signals to the multiple motor drive circuits 30. The multiple motor drive circuits 30 are connected one-to-one with the multiple main control circuits 20. The drive terminals of the multiple motor drive circuits 30 are also used to connect one-to-one with multiple motors. When a motor drive circuit 30 receives a stop control signal, it controls the motor to stop working. Thus, this solution can detect multiple motors through multiple motor fault detection circuits 10. When a motor fault is detected, the main control circuit 20 can output a stop control signal to multiple motor drive circuits 30 to control the faulty motor to stop working. The design of multiple main control circuits 20 can control multiple motors independently, and there will be no situation where the failure of one motor will cause the other motors to also fail to work, which increases the service life of the air duct, thereby increasing the flexibility and durability of the air duct.

[0051] In one embodiment, the multi-motor duct control circuit further includes:

[0052] A bus voltage detection circuit is provided, wherein the detection terminal of the bus voltage detection circuit is used to connect to the voltage bus, and the output terminal of the bus voltage detection circuit is connected to multiple main control circuits 20. The bus voltage detection circuit is used to detect the bus voltage and output the bus voltage detection signal to multiple main control circuits 20.

[0053] In this embodiment, the bus voltage detection circuit can be composed of multiple electronic components such as resistors and capacitors. The bus voltage detection circuit can detect the voltage of the bus connected to the duct and output the bus voltage detection signal to multiple main control circuits 20. The main control circuits 20 can perform voltage compensation on the duct according to the bus voltage, so that the motor can operate more stably. For example, when the bus voltage is higher than the working voltage of the duct, the main control circuit 20 can control the internal voltage conversion circuit to reduce the bus voltage and output it to the motor. Or when the bus voltage is lower than the working voltage of the duct, the main control circuit 20 can control the internal voltage conversion circuit to increase the bus voltage and output it to the motor.

[0054] Furthermore, referring to Figure 4 In one embodiment, the bus voltage detection circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first capacitor C1. The first end of the first resistor R1 is the detection terminal of the bus voltage detection circuit. The second end of the first resistor R1 is connected to the first end of the second resistor R2. The second end of the second resistor R2, the first end of the third resistor R3, and the first end of the fourth resistor R4 are interconnected. The second end of the fourth resistor R4 is connected to the first end of the first capacitor C1 and is the output terminal of the bus voltage detection circuit. The second end of the third resistor R3 and the second end of the first capacitor C1 are grounded.

[0055] In this embodiment, Figure 4 In this circuit, HV+ represents the bus voltage. The first resistor R1 acts as a current-limiting resistor, the second resistor R2 acts as a voltage divider, and the third resistor R3 further adjusts the voltage divider characteristics and can provide a reference voltage or stabilize the output voltage. The fourth resistor R4, together with the first capacitor C1, forms a low-pass filter to smooth the output voltage and reduce the impact of high-frequency noise. The second terminal of the second resistor R2 and the first terminal of the third resistor R3 can output an electrical signal to the main control circuit 20, and the second terminal of the fourth resistor R4 can also output an electrical signal to the main control circuit 20. The main control circuit 20 can determine the bus voltage value based on one of these electrical signals, and the signal can be output to... Figure 3 HV-AD1 in.

[0056] In one embodiment, the air duct includes multiple heating wires, and the multi-motor air duct control circuit includes:

[0057] Multiple heating wire driving circuits are connected one-to-one with multiple main control circuits 20. The heating wire driving circuit is used to drive the heating wire to work when it receives the heating wire working signal output by the main control circuit 20.

[0058] In this embodiment, the heating wire driving circuit can be composed of a thyristor, an optocoupler, and multiple resistors. The specific circuit interface of the heating wire driving circuit can be found in [reference needed]. Figure 5 Configure the system. For solutions with multiple motors, this embodiment can use a multi-heating wire approach, where each main control circuit 20 controls one heating wire. When the motor is working normally, the main control circuit 20 can output a heating wire working signal to the heating wire drive circuit, thereby driving the corresponding heating wire to work. When the motor stops working abnormally, the corresponding heating wire can also be controlled to stop working, thus increasing the safety of the duct. Figure 5 This is a circuit diagram showing two heating wires, where HE2 and HE3 represent the heating wires. This diagram can be used as a reference when setting multiple heating wires. Figure 5 Expand the circuit.

[0059] Reference Figure 6 In one embodiment, the multi-motor duct control circuit further includes:

[0060] The selection button 40 is connected to multiple main control circuits 20. When the selection button 40 is triggered, it outputs a selection trigger signal to one or more main control circuits 20. When the main control circuit 20 receives the selection trigger signal, it outputs a working signal to the motor drive circuit 30.

[0061] In this embodiment, the selection button 40 allows the user to select a motor to operate by triggering the selection button 40. For example, multiple buttons can be set up to correspond to multiple motors. When the user triggers a button, a selection trigger signal is output to the corresponding main control circuit 20. The main control circuit 20 can then output a working signal to the motor drive circuit 30 to drive the corresponding motor to work. The selection button 40 can be a physical button or a virtual button.

[0062] Reference Figure 6 In one embodiment, the multi-motor duct control circuit further includes:

[0063] The wireless communication circuit 50 is used to connect to an external terminal. The output terminal of the wireless communication circuit 50 is connected to the input terminals of the multiple main control circuits 20. The wireless communication circuit 50 is used to output the wireless control signal output by the external terminal to the multiple main control circuits 20.

[0064] The main control circuit 20 is used to output motor control signals to the motor drive circuit 30 according to the wireless control signals.

[0065] In this embodiment, the wireless communication circuit 50 can be composed of a wireless communication chip and electronic components such as resistors and capacitors. The wireless communication circuit 50 can receive wireless control signals output by external terminals, such as mobile phones or Bluetooth devices, and convert them into signals that the main control circuit 20 can recognize. The main control circuit 20 can then output motor control signals to the motor drive circuit 30 according to the wireless control signals, so that the motor drive circuit 30 drives the motor to work. In addition, the main control circuit 20 can also output heating wire control signals to the heating wire drive circuit according to the wireless control signals, thereby driving the heating wire to work.

[0066] Reference Figure 6 In one embodiment, the multi-motor duct control circuit further includes:

[0067] The display circuit 60 has its input terminal connected to the output terminals of the multiple main control circuits 20. The main control circuits 20 are used to control the display circuit 60 to work when outputting motor control signals to the motor drive circuit 30.

[0068] In this embodiment, the display circuit 60 can be composed of multiple light-emitting diodes and resistors. The specific circuit structure of the display circuit 60 can be referred to... Figure 7 Configure the settings. The LEDs in display circuit 60 can be used to display the corresponding speed and temperature settings of the air duct, and also to display the power status of multiple motors. See details... Figure 7 The LEDs in the display are arranged in three groups: LED1 displays the fan speed setting, fan temperature setting, and motor power status; LED4, LED5, and LED6 illuminate when the motor malfunctions. The specific LED display status and colors can be customized according to user requirements.

[0069] Reference Figure 6 In one embodiment, the multi-motor duct control circuit further includes:

[0070] An alarm circuit 70 is provided, the input of which is connected to the output of a plurality of main control circuits 20. The main control circuits 20 are used to control the alarm circuit 70 to operate when a motor fault is determined based on the motor detection signal.

[0071] In this embodiment, the alarm circuit 70 can be composed of a buzzer or other devices. When the main control circuit 20 determines that the motor is faulty based on the motor detection signal, it controls the buzzer to sound, which can serve as a warning to the user. In this way, even if the user is not paying attention to the display circuit 60 of the air duct, he or she can know that the motor in the air duct has malfunctioned.

[0072] In one embodiment, the multi-motor duct control circuit further includes:

[0073] The power supply circuit has its output terminal connected to the power supply terminals of the plurality of motor fault detection circuits 10, the plurality of main control circuits 20, and the plurality of motor drive circuits 30. The power supply circuit is used to provide operating voltage to the plurality of motor fault detection circuits 10, the plurality of main control circuits 20, and the plurality of motor drive circuits 30.

[0074] In this embodiment, the power supply circuit can be implemented using a DC-DC circuit or a power chip. The power supply circuit can convert the external power supply voltage into a suitable operating voltage for the multiple motor fault detection circuits 10, multiple main control circuits 20, and multiple motor drive circuits 30, so as to prevent the multiple motor fault detection circuits 10, multiple main control circuits 20, and multiple motor drive circuits 30 from receiving too high an operating voltage and causing damage to the devices, or receiving too low an operating voltage and causing the devices to malfunction. The power supply circuit can also have a built-in battery pack to provide operating voltage to the multiple motor fault detection circuits 10, multiple main control circuits 20, and multiple motor drive circuits 30.

[0075] This utility model also proposes a ventilation duct.

[0076] In one embodiment, the ventilation duct includes multiple motors and a multi-motor ventilation duct control circuit as described above, with each of the multiple motors connected one-to-one to a multiple motor drive circuit 30 in the multi-motor ventilation duct control circuit. It is understood that since the above-described multi-motor ventilation duct control circuit is used in the ventilation duct of this utility model, the embodiments of the ventilation duct of this utility model include all the technical solutions of all embodiments of the above-described multi-motor ventilation duct control circuit, and the achieved technical effects are completely the same, and will not be repeated here.

[0077] It should be understood that the application of this utility model is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A multi-motor ventilation duct control circuit, characterized in that, The ventilation duct includes multiple motors, and the multi-motor ventilation duct control circuit includes: Multiple motor fault detection circuits are used to detect the operating status of multiple motors one-to-one and output motor detection signals; Multiple main control circuits are connected one-to-one with multiple motor fault detection circuits. The main control circuits are used to output a stop control signal when a motor fault is determined based on the motor detection signal. Multiple motor drive circuits are connected one-to-one with multiple main control circuits. The drive terminals of the multiple motor drive circuits are used to connect one-to-one with multiple motors. The motor drive circuits are used to drive the motors to stop working when they receive the stop control signal.

2. The multi-motor duct control circuit as described in claim 1, characterized in that, The multi-motor air duct control circuit also includes: A bus voltage detection circuit is provided, wherein the detection terminal of the bus voltage detection circuit is used to connect to the voltage bus, and the output terminal of the bus voltage detection circuit is connected to multiple main control circuits. The bus voltage detection circuit is used to detect the bus voltage and output the bus voltage detection signal to multiple main control circuits.

3. The multi-motor duct control circuit as described in claim 2, characterized in that, The bus voltage detection circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first capacitor. The first end of the first resistor is the detection terminal of the bus voltage detection circuit. The second end of the first resistor is connected to the first end of the second resistor. The second end of the second resistor, the first end of the third resistor, and the first end of the fourth resistor are interconnected. The second end of the fourth resistor is connected to the first end of the first capacitor and is the output terminal of the bus voltage detection circuit. The second end of the third resistor and the second end of the first capacitor are grounded.

4. The multi-motor ventilation duct control circuit as described in claim 1, characterized in that, The air duct includes multiple heating wires, and the multi-motor air duct control circuit includes: Multiple heating wire drive circuits are connected one-to-one with multiple main control circuits. The heating wire drive circuit is used to drive the heating wire to work when it receives the heating wire working signal output by the main control circuit.

5. The multi-motor duct control circuit as described in claim 1, characterized in that, The multi-motor air duct control circuit also includes: The selection button is connected to multiple main control circuits. When the selection button is triggered, it outputs a selection trigger signal to one or more of the main control circuits. When the main control circuit receives the selection trigger signal, it outputs a working signal to the motor drive circuit.

6. The multi-motor ventilation duct control circuit as described in claim 1, characterized in that, The multi-motor air duct control circuit also includes: A wireless communication circuit is used to connect to an external terminal. The output terminal of the wireless communication circuit is connected to the input terminals of multiple main control circuits. The wireless communication circuit is used to output the wireless control signal output by the external terminal to the multiple main control circuits. The main control circuit is used to output motor control signals to the motor drive circuit according to the wireless control signals.

7. The multi-motor duct control circuit as described in claim 1, characterized in that, The multi-motor air duct control circuit also includes: The display circuit has its input terminal connected to the output terminals of the multiple main control circuits. The main control circuits are used to control the display circuit to operate when outputting motor control signals to the motor drive circuit.

8. The multi-motor duct control circuit as described in claim 1, characterized in that, The multi-motor air duct control circuit also includes: An alarm circuit is provided, the input of which is connected to the output of multiple main control circuits; the main control circuits are used to control the alarm circuit to operate when a motor fault is determined based on the motor detection signal.

9. The multi-motor ventilation duct control circuit as described in claim 1, characterized in that, The multi-motor air duct control circuit also includes: The power supply circuit has its output terminal connected to the power supply terminals of the plurality of motor fault detection circuits, the plurality of main control circuits, and the plurality of motor drive circuits. The power supply circuit is used to provide operating voltage to the plurality of motor fault detection circuits, the plurality of main control circuits, and the plurality of motor drive circuits.

10. A ventilation duct, characterized in that, It includes multiple motors and a multi-motor ventilation duct control circuit as described in any one of claims 1-9, wherein the multiple motors are connected one-to-one with multiple motor drive circuits in the multi-motor ventilation duct control circuit.

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