Dust removal control circuit for electrical engineering and automation thereof

Abstract

The utility model discloses a dust removal control circuit for electrical engineering and automation thereof, which relates to the technical field of fire alarm, and comprises a power supply module used for power supply processing and power supply; the dust collection plate weight detection module is used for detecting the weight of a dust collection plate on the electric dust remover and judging the weight; the overweight detection module is used for overweight detection; the dust removal control module is used for performing electric dust removal; the power supply control module is used for electric energy transmission control; and the fan speed regulation module is used for ventilation control, and the ventilation rate is controlled by a dust collection plate weight detection circuit. According to the dust removal control circuit for electrical engineering and automation thereof, the dust removal control module carries out dust removal treatment on electrical engineering equipment, the fan speed regulation module controls air flow, and the dust collection plate weight detection module detects that the dust removal process of the dust removal control module is carried out when the weight of sucked dust reaches a set weight threshold value. The ventilation rate of the fan speed regulation module is reduced, and when the dust weight reaches an overweight threshold value, the fan speed regulation module stops working.

Description

Technical Field

[0001] The utility model relates to the technical field of dust removal, in particular to a dust removal control circuit for electrical engineering and its automation. Background Technique

[0002] Electrical engineering and its automation involve many fields such as power electronics technology, computer technology, motor and electrical appliance technology, information and network technology, and mechatronics. The equipment of electrical engineering is generally installed centrally at a designated location. These equipment generally have relatively high requirements for the dust content in the room during operation. Therefore, special dust removal devices will be used. The dust removal devices in the prior art generally consist of an electrostatic dust removal circuit and a fan circuit. The fan circuit conducts air circulation treatment, and the electrostatic dust removal circuit attracts the dust in the flowing air. However, when the thickness of the absorbed dust reaches a certain amount, the dust removal efficiency will be reduced. At this time, due to the ventilation of the fan circuit, the unabsorbed dust will enter the equipment. Therefore, it needs to be improved. Content of the Utility Model

[0003] The embodiment of the utility model provides a dust removal control circuit for electrical engineering and its automation to solve the problems put forward in the above background technique.

[0004] To achieve the above object, the utility model provides the following technical solutions:

[0005] A dust removal control circuit for electrical engineering and its automation, comprising: a power supply module, a dust collecting plate weight detection module, an overweight detection module, a dust removal control module, a power supply control module, and a fan speed regulation module;

[0006] The power supply module is used to access AC electric energy and perform step-down, rectification filtering, and voltage stabilization filtering on the AC electric energy;

[0007] The dust collecting plate weight detection module is connected to the power supply module, and is used to receive the electric energy output by the power supply module, detect the weight of the dust collecting plate on the electrostatic precipitator and output a first detection signal, and output a first control signal when the first detection signal is lower than the set weight threshold;

[0008] The overweight detection module is connected to the dust collecting plate weight detection module and the power supply module, and is used to receive the electric energy output by the power supply module, and output a second control signal when the first detection signal is lower than the set overweight threshold;

[0009] The dust removal control module is connected to the power supply module and the overweight detection module, and is used to receive the AC electric energy accessed by the power supply module and perform electrostatic dust removal work, and stop the electrostatic dust removal work when receiving the second control signal;

[0010] The power control module, connected to the power module and the overweight detection module, is used to transmit the electric energy output by the power module to the fan speed regulation module and stop the electric energy transmission work when receiving the second control signal;

[0011] The fan speed regulation module, connected to the power module, the power control module and the dust collection plate weight detection module, is used to receive the electric energy transmitted by the power control module and control the fan to perform ventilation work, and automatically reduce the wind speed when receiving the first control signal.

[0012] As a further solution of the present utility model: The power module includes a power interface, a first transformer, a first rectifier, a first capacitor, a first voltage regulator and a second capacitor; The dust removal control module includes a first relay switch, an electrostatic precipitator, a first relay and a first switching tube;

[0013] Preferably, the first end of the power interface is connected to the first end of the primary side of the first transformer and the first moving end of the first relay switch, the second end of the power interface is connected to the second end of the primary side of the first transformer and the second moving end of the first relay switch, the first static end and the second static end of the first relay switch are respectively connected to the first end and the second end of the electrostatic precipitator, the first end and the second end of the secondary side of the first transformer are respectively connected to the first end and the second end of the first rectifier, the third end of the first rectifier is connected to the third end of the first voltage regulator and is connected to the fourth end of the first rectifier, the first end of the first voltage regulator, the emitter of the first switching tube, one end of the second capacitor and the ground terminal through the first capacitor, the second end of the first voltage regulator is connected to the other end of the second capacitor and one end of the first relay, the other end of the first relay is connected to the collector of the first switching tube, and the base of the first switching tube is connected to the overweight detection module.

[0014] As a further solution of the present utility model: The dust collection plate weight detection module includes a pressure detection device, a first resistor, a second resistor and a first comparator;

[0015] Preferably, the power supply of the pressure detection device is connected to the second end of the first voltage regulator and is connected to the inverting terminal of the first comparator and one end of the second resistor through the first resistor, the non-inverting terminal of the first comparator is connected to the output terminal of the pressure detection device, the grounding terminal of the pressure detection device and the other end of the second resistor are both grounded, and the output terminal of the first comparator is connected to the fan speed regulation module.

[0016] As a further solution of the present utility model: The power control module includes a third resistor, a first power tube and a second switching tube;

[0017] Preferably, the gate of the first power tube is connected to the collector of the second switching tube and is connected to the drain of the first power tube and the second end of the first voltage regulator through the third resistor, the gate of the first power tube is connected to the fan speed regulation module, the emitter of the second switching tube is grounded, and the base of the second switching tube is connected to the overweight detection module.

[0018] As a further solution of the present utility model: The fan speed regulation module includes a fourth resistor, a third switching tube, a fourth switching tube, a fifth switching tube, a third capacitor, a first diode, a sixth resistor, a second diode, a seventh resistor, a fifth resistor, a fourth capacitor, a second power tube, a first driver, and a first motor;

[0019] Preferably, the seventh terminal of the first driver is connected to the cathode of the second diode, the anode of the first diode, the emitter of the third switching tube, and the emitter of the fifth switching tube. The base of the fifth switching tube is connected to the collector of the fourth switching tube and is connected to one end of the fourth resistor, the source of the first power tube, the fourth terminal and the eighth terminal of the first driver through the sixth resistor. The other end of the fourth resistor is connected to the collector of the third switching tube and is connected to the collector of the fifth switching tube through the fifth resistor. The bases of the third switching tube and the fourth switching tube are both connected to the output terminal of the first comparator. The anode of the second diode is connected to one end of the third capacitor, the cathode of the first diode, the second terminal and the sixth terminal of the first driver through the seventh resistor. The emitter of the fourth switching tube, the other end of the third capacitor, the first terminal of the first driver, and the source of the second power tube are all grounded. The fifth terminal of the first driver is grounded through the fourth capacitor. The third terminal of the first driver is connected to the gate of the second power tube. The drain of the second power tube is connected to one end of the first motor. The other end of the first motor is connected to the third terminal of the first rectifier.

[0020] As a further solution of the present utility model: The overweight detection module includes an eighth resistor, a ninth resistor, and a second comparator;

[0021] Preferably, the inverting terminal of the second comparator is connected to one end of the ninth resistor and is connected to the second terminal of the first voltage regulator through the eighth resistor. The other end of the ninth resistor is grounded. The non-inverting terminal of the second comparator is connected to the output terminal of the pressure detection device. The output terminal of the second comparator is connected to the bases of the first switching tube and the second switching tube.

[0022] Compared with the prior art, the beneficial effects of the present utility model are as follows: The dust removal control circuit for electrical engineering and its automation in the present utility model performs dust removal treatment on electrical engineering equipment by the dust removal control module, controls the air flow by the fan speed regulation module, detects the weight of the dust attracted by the dust removal control module during the dust removal process by the dust collection plate weight detection module, and when the dust weight reaches the set weight threshold, reduces the ventilation rate of the fan speed regulation module, and then reduces the air flow rate when the dust removal efficiency is low, avoiding excessive dust in the air from entering the electrical engineering equipment, ensuring the dust removal efficiency, and at the same time, when the dust weight reaches the overweight threshold, it indicates that the dust collection plate needs to be cleaned, and at this time, the operation of the fan speed regulation module and the dust removal control module will be stopped. Description of the Drawings

[0023] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments of the present utility model. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 It is a schematic block diagram of the principle of a dust removal control circuit for electrical engineering and its automation provided by an example of the present utility model.

[0025] Figure 2 It is a circuit diagram of a dust removal control circuit for electrical engineering and its automation provided by an example of the present utility model.

[0026] Figure 3 It is a connection circuit diagram of an overweight detection module provided by an example of the present utility model. Specific embodiments

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0028] In one embodiment, please refer to Figure 1 , a dust removal control circuit for electrical engineering and its automation, including: a power supply module 1, a dust collecting plate weight detection module 2, an overweight detection module 3, a dust removal control module 4, a power supply control module 5, and a fan speed regulation module 6;

[0029] Specifically, the power supply module 1 is used to access AC electrical energy and perform step-down, rectification filtering, and voltage stabilization filtering on the AC electrical energy;

[0030] The dust collecting plate weight detection module 2 is connected to the power supply module 1, and is used to receive the electrical energy output by the power supply module 1, detect the weight of the dust collecting plate on the electrostatic precipitator and output a first detection signal, and output a first control signal when the first detection signal is lower than the set weight threshold;

[0031] The overweight detection module 3 is connected to the dust collecting plate weight detection module 2 and the power supply module 1, and is used to receive the electrical energy output by the power supply module 1, and output a second control signal when the first detection signal is lower than the set overweight threshold;

[0032] The dust removal control module 4, connected to the power supply module 1 and the overweight detection module 3, is used to receive the AC power accessed by the power supply module 1 and perform electrostatic dust removal work, and stop the electrostatic dust removal work when receiving the second control signal;

[0033] The power control module 5, connected to the power supply module 1 and the overweight detection module 3, is used to transmit the electric energy output by the power supply module 1 to the fan speed regulation module 6, and stop the electric energy transmission work when receiving the second control signal;

[0034] The fan speed regulation module 6, connected to the power supply module 1, the power control module 5 and the dust collecting plate weight detection module 2, is used to receive the electric energy transmitted by the power control module 5 and control the fan to perform ventilation work, and automatically reduce the wind speed when receiving the first control signal.

[0035] In a specific embodiment, the above-mentioned power supply module 1 can adopt a power supply circuit composed of a power supply interface, a transformer, a rectifier, a voltage regulator, etc., which can access AC power and perform step-down, rectification filtering and voltage stabilization filtering on the AC power; the above-mentioned dust collecting plate weight detection module 2 can adopt a dust collecting plate weight detection circuit composed of a pressure detection device, a comparator and a resistor, which can detect the weight of the dust collecting plate on the electrostatic precipitator and the set weight threshold, and judge whether it is necessary to reduce the wind speed of the fan speed regulation module 6 by judging the magnitude relationship between the weight of the dust collecting plate and the weight threshold; the above-mentioned overweight detection module 3 can adopt an overweight detection circuit composed of a comparator and a resistor, set an overweight threshold, judge the magnitude relationship between the weight of the dust collecting plate and the overweight threshold, and when the weight of the dust collecting plate is greater than the overweight threshold, the dust collecting plate will not be able to attract dust normally; the above-mentioned dust removal control module 4 can adopt a dust removal control circuit composed of an electrostatic precipitator, a relay, a triode, etc., to control the electrostatic dust removal work; the above-mentioned power control module 5 can adopt a power control circuit composed of a field effect transistor, a triode and a resistor to control the transmission of electric energy; the above-mentioned fan speed regulation module 6 can adopt a fan speed regulation circuit composed of a resistor, a triode, a driver, a motor, etc., which can control the air flow and can control the air flow rate by adjusting the fan speed.

[0036] In another embodiment, please refer to Figure 1 、 Figure 2 and Figure 3 , the power supply module 1 includes a power supply interface, a first transformer B1, a first rectifier T1, a first capacitor C1, a first voltage regulator IC1 and a second capacitor C2; the dust removal control module 4 includes a first relay switch K1-1, an electrostatic precipitator, a first relay K1 and a first switch tube V1;

[0037] Specifically, the first end of the power interface is connected to the first end of the primary side of the first transformer B1 and the first moving end of the first relay switch K1-1, and the second end of the power interface is connected to the second end of the primary side of the first transformer B1 and the second moving end of the first relay switch K1-1. The first static end and the second static end of the first relay switch K1-1 are respectively connected to the first end and the second end of the electrostatic precipitator. The first end and the second end of the secondary side of the first transformer B1 are respectively connected to the first end and the second end of the first rectifier T1. The third end of the first rectifier T1 is connected to the third end of the first voltage regulator IC1 and is connected to the fourth end of the first rectifier T1, the first end of the first voltage regulator IC1, the emitter of the first switching transistor V1, one end of the second capacitor C2, and the ground terminal through the first capacitor C1. The second end of the first voltage regulator IC1 is connected to the other end of the second capacitor C2 and one end of the first relay K1. The other end of the first relay K1 is connected to the collector of the first switching transistor V1. The base of the first switching transistor V1 is connected to the overweight detection module 3.

[0038] In a specific embodiment, the above-mentioned first voltage regulator IC1 can be a 7812 voltage regulator; the above-mentioned first relay switch K1-1 can be a normally closed double-pole double-throw switch, and the first relay K1 controls the disconnection of the first relay switch K1-1 by magnetic attraction; the above-mentioned first switching transistor V1 can be an NPN-type triode; the above-mentioned electrostatic precipitator can be composed of a transformer, a rectifier, an inverter, a dust collecting plate, and a discharge electrode. The transformer, the rectifier, and the inverter provide a high-voltage power supply, the discharge electrode discharges, and the dust collecting plate attracts and adsorbs dust.

[0039] Further, the dust collecting plate weight detection module 2 includes a pressure detection device, a first resistor R1, a second resistor R2, and a first comparator A1;

[0040] Specifically, the power supply of the pressure detection device is connected to the second end of the first voltage regulator IC1 and is connected to the inverting end of the first comparator A1 and one end of the second resistor R2 through the first resistor R1. The non-inverting end of the first comparator A1 is connected to the output end of the pressure detection device. The grounding end of the pressure detection device and the other end of the second resistor R2 are both grounded. The output end of the first comparator A1 is connected to the fan speed regulation module 6.

[0041] In a specific embodiment, the above-mentioned pressure detection device can be composed of an LM2904 pressure sensor and an AD521 operational amplifier, which detects the weight of the dust collecting plate and amplifies and converts the detected signal; the above-mentioned first resistor R1 and second resistor R2 set a weight threshold; the above-mentioned first comparator A1 can be an LM358 comparator.

[0042] Further, the power control module 5 includes a third resistor R3, a first power transistor Q1, and a second switching transistor V2;

[0043] Specifically, the gate of the first power transistor Q1 is connected to the collector of the second switching transistor V2 and is connected to the drain of the first power transistor Q1 and the second terminal of the first voltage regulator IC1 through the third resistor R3. The gate of the first power transistor Q1 is connected to the fan speed regulation module 6. The emitter of the second switching transistor V2 is grounded, and the base of the second switching transistor V2 is connected to the overweight detection module 3.

[0044] In a specific embodiment, the above-mentioned first power transistor Q1 can be selected as an N-channel field effect transistor; the above-mentioned second switching transistor V2 can be selected as an NPN type triode.

[0045] Further, the fan speed regulation module 6 includes a fourth resistor R4, a third switching transistor V3, a fourth switching transistor V4, a fifth switching transistor V5, a third capacitor C3, a first diode D1, a sixth resistor R6, a second diode D2, a seventh resistor R7, a fifth resistor R5, a fourth capacitor C4, a second power transistor Q2, a first driver Q2, and a first motor M1;

[0046] Specifically, the seventh terminal of the first driver Q2 is connected to the cathode of the second diode D2, the anode of the first diode D1, the emitter of the third switching transistor V3, and the emitter of the fifth switching transistor V5. The base of the fifth switching transistor V5 is connected to the collector of the fourth switching transistor V4 and is connected to one end of the fourth resistor R4, the source of the first power transistor Q1, the fourth terminal and the eighth terminal of the first driver Q2 through the sixth resistor R6. The other end of the fourth resistor R4 is connected to the collector of the third switching transistor V3 and is connected to the collector of the fifth switching transistor V5 through the fifth resistor R5. The bases of the third switching transistor V3 and the fourth switching transistor V4 are both connected to the output terminal of the first comparator A1. The anode of the second diode D2 is connected to one end of the third capacitor C3, the cathode of the first diode D1, the second terminal and the sixth terminal of the first driver Q2 through the seventh resistor R7. The emitter of the fourth switching transistor V4, the other end of the third capacitor C3, the first terminal of the first driver Q2, and the source of the second power transistor Q2 are all grounded. The fifth terminal of the first driver Q2 is grounded through the fourth capacitor C4. The third terminal of the first driver Q2 is connected to the gate of the second power transistor Q2. The drain of the second power transistor Q2 is connected to one end of the first motor M1. The other end of the first motor M1 is connected to the third terminal of the first rectifier T1.

[0047] In a specific embodiment, the above-mentioned third switching transistor V3, fourth switching transistor V4, and fifth switching transistor V5 can all be selected as N-channel field effect transistors; the above-mentioned first driver Q2 can be selected as an NE555 integrated chip. The duty cycle of the output signal of the first driver Q2 can be adjusted by the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the third switching transistor V3, the fifth switching transistor V5, the fourth switching transistor V4, the first diode D1, and the third capacitor C3; the above-mentioned second power transistor Q2 can be selected as an N-channel field effect transistor; the above-mentioned first motor M1 can be selected as a DC motor.

[0048] Further, the overweight detection module 3 includes an eighth resistor R8, a ninth resistor R9, and a second comparator A2;

[0049] Specifically, the inverting terminal of the second comparator A2 is connected to one end of the ninth resistor R9 and is connected to the second terminal of the first voltage regulator IC1 through the eighth resistor R8. The other end of the ninth resistor R9 is grounded. The non-inverting terminal of the second comparator A2 is connected to the output terminal of the pressure detection device. The output terminal of the second comparator A2 is connected to the bases of the first switching transistor V1 and the second switching transistor V2.

[0050] In a specific embodiment, the above-mentioned eighth resistor R8 and ninth resistor R9 set the overweight threshold; the above-mentioned second comparator A2 can select an LM358 comparator.

[0051] In the dust removal control circuit for electrical engineering and its automation in this embodiment, AC power is accessed through the power interface, and the first transformer B1, the first capacitor C1, the first rectifier T1, and the second capacitor C2 perform step-down, rectification filtering, and voltage stabilization filtering. The first power transistor Q1 performs power transmission. The electric energy triggers the fifth switching transistor V5 to conduct through the fourth resistor R4, controls the sixth resistor R6 to be connected, and the first driver Q2 cooperates with the fourth resistor R4, the fifth resistor R5, the third switching transistor V3, the fourth switching transistor V4, the fifth switching transistor V5, the sixth resistor R6, the first diode D1, the second diode D2, the seventh resistor R7, the third capacitor C3, and the fourth capacitor C4 to oscillate, and controls the conduction state of the second power transistor Q2, and then controls the first motor M1 to rotate for ventilation. At the same time, the first relay switch K1-1 supplies power to the electrostatic precipitator, and the electrostatic precipitator adsorbs the dust in the flowing air. The pressure detection device detects the weight of the dust collection plate adsorbed with dust. When the weight of the dust collection plate adsorbed with dust exceeds the weight threshold set by the first resistor R1 and the second resistor R2, the first comparator A1 outputs a high level and controls the third switching transistor V3 and the fourth switching transistor V4 to conduct, and the fifth switching transistor V5 cuts off, so that the fourth resistor R4 and the fifth resistor R5 are disconnected, and then reduces the duty cycle of the output signal of the first driver Q2, the rotation speed of the first motor M1 decreases, the wind speed decreases, the air volume passing through decreases, and then the rate of dust entering the equipment decreases. When the weight of the dust collection plate exceeds the overweight threshold set by the eighth resistor R8 and the ninth resistor R9, the second comparator A2 outputs a high level and controls the first switching transistor V1 and the second switching transistor V2 to conduct. The first relay K1 is energized and controls the first relay switch K1-1 to disconnect, and the first power transistor Q1 cuts off, and then stops the electrostatic dust removal work and the fan ventilation work.

[0052] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0053] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A dust removal control circuit for electrical engineering and automation, characterized in that: The dust removal control circuit for electrical engineering and automation thereof comprises: a power supply module, a dust collecting plate weight detection module, an overweight detection module, a dust removal control module, a power supply control module and a fan speed control module; The power supply module is used to receive AC power and perform voltage reduction, rectification and filtering and voltage stabilization and filtering processing on the AC power; The dust collecting plate weight detection module is connected to the power module, and is used to receive the electric energy output by the power module, detect the weight of the dust collecting plate on the electrostatic precipitator and output a first detection signal, and output a first control signal when the first detection signal is lower than a set weight threshold; The overweight detection module is connected to the dust collecting plate weight detection module and the power module, and is used to receive the electric energy output by the power module, and output a second control signal when the first detection signal is lower than a set overweight threshold; The dust removal control module is connected to the power supply module and the overweight detection module, and is used to receive the AC power input by the power supply module and perform the electric dust removal work, and stop the electric dust removal work when receiving the second control signal; The power control module is connected to the power module and the overweight detection module, and is used to transmit the power output of the power module to the fan speed control module, and stop the power transmission work when receiving the second control signal; The fan speed regulation module is connected to the power module, the power control module and the dust collecting plate weight detection module, and is used to receive the electric energy transmitted by the power control module and control the fan to perform ventilation work, and automatically reduce the wind speed when receiving the first control signal.

2. A dust removal control circuit for electrical engineering and automation according to claim 1, characterized in that: The power supply module includes a power supply interface, a first transformer, a first rectifier, a first capacitor, a first voltage stabilizer and a second capacitor; the dust removal control module includes a first relay switch, an electrostatic precipitator, a first relay and a first switch tube; The first end of the power interface is connected to the first end of the primary side of the first transformer and the first moving end of the first relay switch, the second end of the power interface is connected to the second end of the primary side of the first transformer and the second moving end of the first relay switch, the first static end and the second static end of the first relay switch are respectively connected to the first end and the second end of the electrostatic precipitator, the first end and the second end of the secondary side of the first transformer are respectively connected to the first end and the second end of the first rectifier, the third end of the first rectifier is connected to the third end of the first voltage regulator and is connected to the fourth end of the first rectifier, the first end of the first voltage regulator, the emitter of the first switch tube, one end of the second capacitor and the ground through the first capacitor, the second end of the first voltage regulator is connected to the other end of the second capacitor and one end of the first relay, the other end of the first relay is connected to the collector of the first switch tube, and the base of the first switch tube is connected to the overweight detection module.

3. A dust removal control circuit for electrical engineering and automation according to claim 2, characterized in that: The dust collecting plate weight detection module includes a pressure detection device, a first resistor, a second resistor and a first comparator; The power supply of the pressure detection device is connected to the second end of the first voltage regulator and is connected to the inverting end of the first comparator and one end of the second resistor through the first resistor. The non-inverting end of the first comparator is connected to the output end of the pressure detection device. The ground end of the pressure detection device and the other end of the second resistor are both grounded. The output end of the first comparator is connected to the fan speed control module.

4. A dust removal control circuit for electrical engineering and automation according to claim 3, characterized in that: The power control module includes a third resistor, a first power tube and a second switch tube; The gate of the first power tube is connected to the collector of the second switch tube and is connected to the drain of the first power tube and the second end of the first regulator through a third resistor. The gate of the first power tube is connected to the fan speed control module, the emitter of the second switch tube is grounded, and the base of the second switch tube is connected to the overweight detection module.

5. A dust removal control circuit for electrical engineering and automation according to claim 4, characterized in that: The fan speed control module includes a fourth resistor, a third switch tube, a fourth switch tube, a fifth switch tube, a third capacitor, a first diode, a sixth resistor, a second diode, a seventh resistor, a fifth resistor, a fourth capacitor, a second power tube, a first driver and a first motor; The seventh end of the first driver is connected to the cathode of the second diode, the anode of the first diode, the emitter of the third switch tube and the emitter of the fifth switch tube. The base of the fifth switch tube is connected to the collector of the fourth switch tube and is connected to one end of the fourth resistor, the source of the first power tube, the fourth end and the eighth end of the first driver through the sixth resistor. The other end of the fourth resistor is connected to the collector of the third switch tube and is connected to the collector of the fifth switch tube through the fifth resistor. The base of the third switch tube and the base of the fourth switch tube are both connected to the output end of the first comparator. The anode of the second diode is connected to one end of the third capacitor, the cathode of the first diode, the second end and the sixth end of the first driver through the seventh resistor. The emitter of the fourth switch tube, the other end of the third capacitor, the first end of the first driver and the source of the second power tube are all grounded. The fifth end of the first driver is grounded through the fourth capacitor. The third end of the first driver is connected to the gate of the second power tube. The drain of the second power tube is connected to one end of the first motor, and the other end of the first motor is connected to the third end of the first rectifier.

6. A dust removal control circuit for electrical engineering and automation according to claim 5, characterized in that: The overweight detection module includes an eighth resistor, a ninth resistor and a second comparator; The inverting end of the second comparator is connected to one end of the ninth resistor and to the second end of the first voltage regulator through the eighth resistor. The other end of the ninth resistor is grounded. The non-inverting end of the second comparator is connected to the output end of the pressure detection device. The output end of the second comparator is connected to the base of the first switch tube and the base of the second switch tube.

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