Electric motor driving circuit and driving method, and electronic device, storage medium and range hood

Abstract

An electric motor driving circuit and driving method, and an electronic device, a storage medium and a range hood. The circuit comprises: a protection sub-circuit (110), a driving sub-circuit (120) and a protection capacitor (130), wherein the protection sub-circuit (110) comprises a bridge circuit (111); the protection sub-circuit (110) is electrically connected to an electric motor winding (220) and the driving sub-circuit (120), respectively; the protection sub-circuit (110) and the protection capacitor (130) are electrically connected to the same power supply (V3); the electric motor winding (220) is used for outputting a coupled high voltage (V2) after being coupled to an electric motor housing (210); the electric motor housing (210) is provided with a test high voltage (V1); and the driving sub-circuit (120) is electrically connected to an electric motor (200), and is used for driving the electric motor (200) under the action of a driving control signal.

Description

Motor drive circuit, drive method, electronic equipment, storage medium and smoke machine

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411900977.9, filed on December 20, 2024, entitled "Motor Drive Circuit, Drive Method, Electronic Device, Storage Medium and Smoke Machine", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of electrical technology, and more specifically, to a motor drive circuit, a motor drive method, an electronic device, a storage medium, and a smoke hood. Background Technology

[0004] Currently, in range hoods with small-switch motors, the distance between the internal windings and the motor housing is relatively short due to motor size limitations. The motor housing is connected to the overall sheet metal casing of the range hood. Therefore, during withstand voltage testing, based on the high-voltage coupling principle, high voltage can be coupled into the motor windings through the motor housing. This high voltage may damage the drive chip and other components that power the motor, causing them to fail.

[0005] However, existing motor protection circuits have poor breakdown protection performance and require high-level component design, which can lead to a significant increase in production costs and may not be universally applicable to most products, resulting in poor applicability.

[0006] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Summary of the Invention

[0007] The disclosure section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This disclosure section is not intended to limit the key features and essential technical features of the claimed technical solutions, nor is it intended to determine the scope of protection of the claimed technical solutions.

[0008] In a first aspect, this disclosure proposes a motor drive circuit for driving a motor, the motor including a motor housing and motor windings, and the drive circuit including:

[0009] The protection sub-circuit, the drive sub-circuit, and the protection capacitor are included in the bridge circuit.

[0010] The protection sub-circuit is electrically connected to the motor winding and the drive sub-circuit respectively. The protection sub-circuit and the protection capacitor are electrically connected to the same power supply. The motor winding is used to output coupled high voltage after coupling with the motor housing. The motor housing is equipped with a test high voltage.

[0011] The drive sub-circuit is electrically connected to the motor and is used to drive the motor under the action of the drive control signal.

[0012] In some implementations, the protection sub-circuit includes a first branch and a second branch;

[0013] The first end of the first branch is electrically connected to the first output end of the motor, the second end of the first branch is electrically connected to the first end of the protection capacitor, and the second end of the protection capacitor is electrically connected to the second output end of the motor.

[0014] The first end of the second branch is electrically connected to the second output end of the motor, the second end of the second branch is electrically connected to the first end of the protection capacitor, and the second end of the protection capacitor is electrically connected to the first output end of the motor. The first end of the protection capacitor is also electrically connected to the power supply, and the second end of the protection capacitor is used for grounding.

[0015] In some implementations, both the first branch and the second branch include diodes.

[0016] In some implementations, the first branch includes a first diode and a second diode. The anode of the first diode is electrically connected to the first output terminal of the motor, the cathode of the first diode is electrically connected to the first terminal of the protection capacitor, the anode of the second diode is electrically connected to the second terminal of the protection capacitor, and the cathode of the second diode is electrically connected to the second output terminal of the motor.

[0017] The second branch includes a third diode and a fourth diode. The positive terminal of the third diode is electrically connected to the second output terminal of the motor, and the negative terminal of the third diode is electrically connected to the first terminal of the protection capacitor. The positive terminal of the fourth diode is electrically connected to the second terminal of the protection capacitor, and the negative terminal of the fourth diode is electrically connected to the first output terminal of the motor.

[0018] In some implementations, the first diode, the second diode, the third diode, and the fourth diode include Schottky barrier diodes.

[0019] In some embodiments, a first diode and a third diode are disposed adjacent to each other in a first region of a circuit board, the first region including a power supply, and a second diode and a fourth diode are disposed adjacent to each other in a second region of a circuit board, the second region including a ground point, and the first diode, the third diode, the second diode and the fourth diode are arranged sequentially along the same straight line direction.

[0020] In some implementations, the drive circuit further includes a detection sub-circuit electrically connected between the protection sub-circuit and the drive sub-circuit.

[0021] In some implementations, the detection sub-circuit includes a transistor and a controller, wherein the controller is used to output a first control signal when the electrical signal output by the protection sub-circuit is within a preset range, and the transistor is used to turn on under the action of the first control signal.

[0022] The controller is used to output a second control signal when the electrical signal output by the protection sub-circuit exceeds the preset range, and the transistor is used to cut off under the action of the second control signal.

[0023] In some implementations, the detection subcircuit includes a voltage divider branch, which divides the electrical signal output by the protection subcircuit and then outputs a voltage-divided signal to the drive subcircuit.

[0024] Secondly, a motor driving method is also proposed, applied to the driving circuit described above. The driving method includes:

[0025] The control motor windings input a first electrical signal to the protection sub-circuit, so that the protection sub-circuit and the protection capacitor perform voltage division processing on the first electrical signal to generate a second electrical signal;

[0026] A second electrical signal is input to the driver circuit.

[0027] In some embodiments, the method further includes, before inputting the second electrical signal to the driver sub-circuit:

[0028] Detect whether the second electrical signal exceeds the preset range.

[0029] In some embodiments, the method further includes, before inputting the second electrical signal to the driver sub-circuit:

[0030] The second electrical signal is divided to generate the third electrical signal;

[0031] The method also includes:

[0032] A third electrical signal is input to the driver circuit.

[0033] Thirdly, an electronic device is also proposed, including a processor and a memory, wherein the memory stores computer program instructions, which are executed by the processor to perform the methods described above.

[0034] Fourthly, a storage medium is also proposed, on which program instructions are stored, which are used to execute the methods described above during runtime.

[0035] Fifthly, a range hood is also proposed, including:

[0036] The electronic device as described above; and / or the motor drive circuit as described above.

[0037] According to the above technical solution, before the coupled high voltage is input to the drive sub-circuit, the coupled high voltage can be discharged and reduced by the protection sub-circuit and the protection capacitor connected to the same power supply as the protection sub-circuit. This ensures that the electrical signal input to the drive sub-circuit meets the normal operating parameter range of the drive sub-circuit to a certain extent, reduces the risk of the drive sub-circuit being damaged by the coupled high voltage, effectively protects the drive sub-circuit, and reduces economic losses caused by component damage. Other advantages, objectives, and features of this disclosure will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this disclosure. Attached Figure Description

[0038] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0041] Figure 1 is a schematic structural block diagram of a motor drive circuit provided in an embodiment of this application;

[0042] Figure 2 is a schematic block diagram illustrating the working principle of a protection sub-circuit provided in an embodiment of this application;

[0043] Figure 3 is a schematic circuit diagram illustrating the working principle of a protection sub-circuit provided in an embodiment of this application;

[0044] Figure 4 is a partial schematic diagram of a circuit board schematic provided in an embodiment of this application;

[0045] Figure 5 is a schematic flowchart of a motor driving method provided in an embodiment of this application;

[0046] Figure 6 is a schematic block diagram of an electronic device provided in an embodiment of this application;

[0047] Figure 7 is a schematic structural block diagram of a range hood provided in an embodiment of this application. Detailed Implementation

[0048] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0049] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus. The technical solutions of the embodiments of this application will now be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them.

[0050] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0051] To address the aforementioned technical problems, a motor drive circuit is proposed according to a first aspect of this application. Figure 1 is a schematic structural block diagram of a motor drive circuit provided in an embodiment of this application. Referring to Figure 1, the motor drive circuit 100 may include a protection sub-circuit 110, a drive sub-circuit 120, and a protection capacitor 130. The protection sub-circuit 110 may include a bridge circuit 111. Referring to Figure 1, the motor drive circuit 100 is used to drive a motor 200, wherein the motor 200 may include a motor housing 210 and a motor winding 220. The motor housing 210 carries a test high-voltage current V1, and the motor winding 220 is used to output a coupled high-voltage current V2 after coupling with the motor housing 210. The protection sub-circuit 110 is electrically connected to both the motor winding 220 and the drive sub-circuit 120, and the protection sub-circuit 110 and the protection capacitor 130 are electrically connected to the same power supply V3. The drive sub-circuit 120 is electrically connected to the motor 200, and the drive sub-circuit 120 is used to drive the motor 200 under the action of the drive control signal IN.

[0052] For example, the aforementioned motor can be applied to any mechanical equipment, industrial production equipment, and household appliances that primarily use motor drive. The motor housing can be connected to the sheet metal housing of the equipment. During a withstand voltage test on the entire machine, a high-voltage test voltage can be input to the equipment under test. The withstand voltage test can be used to verify the equipment's and its electrical circuits' ability to withstand overvoltage. The voltage of the test voltage can be one to several times the rated voltage of the equipment under test. Because the motor housing is connected to the equipment's housing, during the withstand voltage test, the motor housing also receives the externally input test voltage V1 as shown in Figure 1.

[0053] Referring to Figure 1, in drive mode, the motor drive circuit 100 drives the motor 200. For example, the drive sub-circuit 120 can generate a corresponding drive signal OUT under the action of the drive control signal IN. The drive sub-circuit 120 can input the drive signal OUT to the motor 200 to drive the motor 200. The drive control signal IN can come from a control device that can generate control instructions, such as a controller. For example, the controller can be constructed using electronic components such as comparators, registers, and digital logic circuits, or implemented using processor chips and their peripheral circuits such as microcontrollers, microprocessors, programmable logic controllers (PLCs), digital signal processors (DSPs), field-programmable gate arrays (FPGAs), programmable logic arrays (PLAs), and application-specific integrated circuits (ASICs). For example, referring to Figure 1, the drive sub-circuit 120 can generate the drive signal OUT under the action of the drive control signal IN. This drive signal OUT can be used to drive the motor 200 to start, adjust speed, brake, and reverse.

[0054] Referring to Figure 1, in test mode, motor 200 can input a test electrical signal to drive sub-circuit 120. As mentioned above, referring to Figure 1, when the motor housing 210 of motor 200 carries a test high voltage, due to the close distance between motor winding 220 and motor housing 210, motor winding 220 can output a coupled high voltage V2 via high-voltage coupling. The coupled high voltage V2 output by motor winding 220 can be the aforementioned test electrical signal input by motor 200 to drive sub-circuit 120. It should be noted that the voltage values ​​of the test high voltage and the coupled high voltage may be equal or unequal. When the test high voltage value is fixed, the coupled high voltage value may be related to the distance between motor winding 220 and motor housing 210, or it may be related to the parameters of motor winding 220 itself. For example, referring to Figure 1, when motor winding 220 outputs the coupled high voltage V2 to motor drive circuit 100, the coupled high voltage V2 is first supplied to protection sub-circuit 110. The protection sub-circuit 110 may include a bridge circuit 111. A first terminal of the protection sub-circuit 110 is electrically connected to power supply V3, and a second terminal is grounded to GND. Referring to Figure 1, one terminal of the protection capacitor 130 is also electrically connected to power supply V3, and the other terminal is grounded to GND. Since the power supply V3 connected to the protection sub-circuit 110 and the protection capacitor 130 is the same power supply, it can be considered that the protection sub-circuit 110 and the protection capacitor 130 are connected at the same potential. When there is an external input to the protection sub-circuit 110, the input electrical signal can first be transmitted to the protection capacitor 130 to charge it. During the charging process of the protection capacitor 130, the coupled high voltage V2 can be de-energized and reduced in voltage, and then the reduced-voltage electrical signal is transmitted to the drive sub-circuit 120. For example, the parameters of the protection capacitor 130 can be reasonably set according to experience or actual needs, and are not limited here. The reduced-voltage electrical signal can ensure the normal operation of the drive sub-circuit 120.

[0055] For example, the protective capacitor can be any capacitor on a circuit board connected to the same power supply as the protective sub-circuit. In some embodiments, the protective capacitor can be the capacitor on the circuit board located before the input port of the drive sub-circuit, closest to the drive sub-circuit. This ensures the shortest possible loop distance, reducing loop impedance. The input port of the drive sub-circuit can be a port used to receive a high test voltage from the motor in test mode. This input port is used to provide a drive signal to the motor in normal mode. Therefore, relative to the motor, this port is an input port in test mode and an output port in normal mode. That is, the motor and the motor drive circuit can transmit signals to each other to achieve different functions.

[0056] According to the above technical solution, before the coupled high voltage is input to the driving sub-circuit, the coupled high voltage can be discharged and reduced by the setting of the protection sub-circuit and the protection capacitor connected to the same power supply as the protection sub-circuit. This can ensure that the electrical signal input to the driving sub-circuit meets the normal operating parameter range of the driving sub-circuit to a certain extent, reduce the risk of the driving sub-circuit being broken down by the coupled high voltage, effectively protect the driving sub-circuit, and reduce the economic losses caused by component damage.

[0057] In some embodiments, the protection subcircuit includes a first branch and a second branch. Figure 2 is a schematic block diagram illustrating the working principle of a protection subcircuit provided in an embodiment of this application. For example, referring to Figure 2, the protection subcircuit 110 may include a first branch 112 and a second branch 113. The first terminal 1 of the first branch 112 is electrically connected to the first output terminal a of the motor 200, the second terminal 2 of the first branch 112 is electrically connected to the first terminal A of the protection capacitor 130, and the second terminal B of the protection capacitor 130 is electrically connected to the second output terminal b of the motor 200. The first terminal A of the protection capacitor 130 is also electrically connected to the power supply V3, and the second terminal B of the protection capacitor is used for grounding (GND).

[0058] For example, referring to Figure 2, the electrical signal transmission relationship between the devices and electronic components connected by the gray lines in Figure 2 can be as follows: The first output terminal a of the motor 200 outputs a coupled high voltage → the first terminal 1 of the first branch 112 of the protection sub-circuit 110 outputs a high voltage signal via the second terminal 2 of the first branch 112 → the first terminal A of the protection capacitor 130 uses the high voltage signal output from the second terminal 2 of the first branch 112 to charge and discharge the protection capacitor 130 → the second terminal B of the protection capacitor 130 outputs a discharged and voltage-reduced electrical signal to the second output terminal b of the motor 200. Therefore, when the coupled high voltage is output from the first output terminal a of the motor 200, the coupled high voltage can be discharged and voltage-reduced through the above path, and then the voltage-reduced electrical signal is input to the drive sub-circuit.

[0059] For example, referring to Figure 2, the first end 3 of the second branch 113 is electrically connected to the second output end b of the motor 200, the second end 4 of the second branch 113 is electrically connected to the first end A of the protection capacitor 130, and the second end B of the protection capacitor 130 is electrically connected to the first output end a of the motor 200.

[0060] Referring to Figure 2, the electrical signal transmission relationship between the devices and electronic components connected by the black lines in Figure 2 can be as follows: The second output terminal b of the motor 200 outputs a coupled high voltage → the first terminal 3 of the second branch 113 of the protection sub-circuit 110 outputs a high-voltage electrical signal via the second terminal 4 of the second branch 113 → the first terminal A of the protection capacitor 130 uses the high-voltage signal output from the second terminal 4 of the first branch 113 to charge and discharge the protection capacitor 130 → the second terminal B of the protection capacitor 130 outputs a discharged and voltage-reduced electrical signal to the first output terminal a of the motor 200. Therefore, when the coupled high voltage is output from the second output terminal b of the motor 200, the coupled high voltage can be discharged and voltage-reduced through the above path, and then the voltage-reduced electrical signal is input to the drive sub-circuit.

[0061] Therefore, when a motor has multiple output ports, different branches in the protection sub-circuit can be used to charge and discharge the protection capacitor, thereby protecting the drive sub-circuit. In practical applications, a protection sub-circuit with a corresponding number of branches can be selected according to the motor model, improving the adaptability of the protection sub-circuit and increasing the effectiveness of protecting the drive sub-circuit.

[0062] In some implementations, both the first and second branches can include diodes. For example, as described above, when different output ports of the motor output high-voltage signals, different branches in the protection sub-circuit can be used to charge and discharge the protection capacitor. For example, diodes can be placed in both the first and second branches. Due to the unidirectional conductivity of diodes, signal interference between branches can be effectively avoided, and the simultaneous charging of the protection capacitor by multiple branches can be prevented, thus avoiding damage to the protection capacitor and economic losses. Furthermore, diodes are low-cost and will not significantly increase production costs.

[0063] Figure 3 is a schematic circuit diagram illustrating the working principle of a protection sub-circuit provided in an embodiment of this application. For example, referring to Figure 3, the first branch 112 may include a first diode D1 and a second diode D2. The anode of the first diode D1 is electrically connected to the first output terminal a of the motor 200, and the cathode of the first diode D1 is electrically connected to the first terminal A of the protection capacitor C1. The anode of the second diode D2 is electrically connected to the second terminal B of the protection capacitor C1, and the cathode of the second diode D2 is electrically connected to the second output terminal b of the motor 200.

[0064] For example, referring to Figure 3, when a coupled high voltage is output from the first output terminal a of the motor 200, due to the unidirectional conductivity of the diode, the high voltage signal can only be input to the protection capacitor C1 through the first diode D1 of the first branch 112. After the protection capacitor C1 is charged and de-energized, the second terminal B of the protection capacitor C1 outputs a de-energized and voltage-reduced electrical signal to the second diode D2 of the first branch 112, and finally returns to the second output terminal b of the motor 200, forming a closed loop. If the second terminal B of the protection capacitor C1 outputs a de-energized and voltage-reduced electrical signal to the fourth diode D4 of the second branch 113, the output electrical signal conflicts with the coupled high voltage output by the motor 200, and a loop cannot be formed. Therefore, when the coupled high voltage is output from the first output terminal a of the motor 200, the coupled high voltage can be de-energized and voltage-reduced through the above closed loop, and then the voltage-reduced electrical signal is input to the drive sub-circuit.

[0065] For example, referring to Figure 3, the second branch 113 includes a third diode D3 and a fourth diode D4. The positive terminal of the third diode D3 is electrically connected to the second output terminal b of the motor 200, and the negative terminal of the third diode D3 is electrically connected to the first terminal A of the protection capacitor C1. The positive terminal of the fourth diode D4 is electrically connected to the second terminal B of the protection capacitor C1, and the negative terminal of the fourth diode D4 is electrically connected to the first output terminal a of the motor 200.

[0066] Referring to Figure 3, when a coupled high voltage is output from the second output terminal b of the motor 200, due to the unidirectional conductivity of the diode, this high voltage signal can only be input to the protection capacitor C1 through the third diode D3 of the second branch 113. After charging and dissipating the energy of the protection capacitor C1, the second terminal B of the protection capacitor C1 outputs a dissipated and voltage-reduced electrical signal to the fourth diode D4 of the second branch 113, and finally returns to the first output terminal a of the motor 200, forming a closed loop. Similarly, if the second terminal B of the protection capacitor C1 outputs a dissipated and voltage-reduced electrical signal to the second diode D2 of the first branch 113, the output electrical signal conflicts with the coupled high voltage output by the motor 200, and a loop cannot be formed. Therefore, when the coupled high voltage is output from the second output terminal b of the motor 200, the coupled high voltage can be dissipated and voltage-reduced through the above closed loop, and then the voltage-reduced electrical signal is input to the drive sub-circuit.

[0067] Therefore, the first and second branches can be formed separately using a circuit structure that includes diodes. The unidirectional conductivity of diodes effectively avoids signal interference between branches and prevents multiple branches from simultaneously charging the protection capacitor, thus avoiding capacitor breakdown and damage, and minimizing economic losses. Furthermore, diodes are low-cost and do not significantly increase production costs.

[0068] In some embodiments, the first diode, second diode, third diode, and fourth diode include Schottky barrier diodes. For example, a Schottky barrier diode is a diode made using the Schottky barrier effect, which has advantages such as low forward voltage drop, fast switching speed, and low power consumption. Using Schottky barrier diodes to construct the circuit structure of the first and second branches ensures that the first and second branches can quickly respond to coupled high voltages, thereby improving the protection efficiency of the entire protection subcircuit for the drive subcircuit.

[0069] Figure 4 is a partial schematic diagram of a circuit board schematic provided in an embodiment of this application. For example, referring to Figure 4, a first diode D1 and a third diode D3 are arranged adjacently in a first region 410 of the circuit board, which includes a +12V power supply. A second diode D2 and a fourth diode D4 are arranged adjacently in a second region 420 of the circuit board, which includes a ground point GND. For example, referring to Figure 3, the cathodes of both the first diode D1 and the third diode D3 are electrically connected to the +12V power supply. It should be noted that 12V is merely exemplary and does not imply a limitation on the power supply voltage. When the cathodes of both the first diode D1 and the third diode D3 are connected to the same power supply, they are arranged adjacently in the first region including the power supply on the circuit board. Similarly, referring to Figure 3, the anodes of both the second diode D2 and the fourth diode D4 are grounded to GND, and they can be arranged adjacently in the second region including the ground point on the circuit board. This ensures shorter wiring, cleaner routing, and reduced loop impedance with shorter wiring. For example, diodes D1, D3, D2, and D4 are arranged sequentially along the same straight line. Referring to Figure 4, diodes D1, D3, D2, and D4 are arranged sequentially from left to right along the same straight line. Alternatively, diodes D1, D3, D2, and D4 can also be arranged sequentially from right to left along the same straight line, in which case the positions of the power supply and ground point are interchanged.

[0070] In some embodiments, the driving circuit further includes a detection sub-circuit, which can be electrically connected between the protection sub-circuit and the driving sub-circuit. For example, the detection sub-circuit can be used to detect whether the voltage-divided electrical signal output by the protection sub-circuit meets the requirements of the relevant electrical signals under normal operating conditions of the driving sub-circuit. If the requirements are met, an electrical signal can be output normally to the driving sub-circuit; otherwise, no electrical signal is output to the driving sub-circuit. For example, if a failure to meet the requirements is detected, any existing or future electronic circuits, devices, or modules capable of voltage division can be used to further divide the detected electrical signal to obtain a new voltage-divided electrical signal. This new signal is then input to the driving sub-circuit, ensuring the normal operation of the driving sub-circuit and providing further protection for it.

[0071] In some embodiments, the detection subcircuit may include a transistor and a controller. The controller is used to output a first control signal when the electrical signal output by the protection subcircuit is within a preset range, and the transistor is used to turn on under the action of the first control signal. The controller is also used to output a second control signal when the electrical signal output by the protection subcircuit exceeds the preset range, and the transistor is used to turn off under the action of the second control signal.

[0072] For example, the protection subcircuit can input an electrical signal to the controller, which can determine whether the input electrical signal is within a preset range. For example, the controller can be constructed using electronic components such as comparators, registers, and digital logic circuits, or implemented using processor chips such as microcontrollers, microprocessors, programmable logic controllers (PLCs), digital signal processors (DSPs), field-programmable gate arrays (FPGAs), programmable logic arrays (PLAs), and application-specific integrated circuits (ASICs) and their peripheral circuits. This controller can be the same as or different from the aforementioned controller used to output drive control signals. When the electrical signal output by the protection subcircuit is within the preset range, the controller can output a first control signal to the gate of the transistor, causing the transistor to conduct. When the transistor is conducting, the electrical signal output by the protection subcircuit can be input to the drive subcircuit through the source and drain of the transistor. When the electrical signal output by the protection subcircuit is outside the preset range, the controller can output a second control signal to the gate of the transistor. Under the action of the second control signal, the transistor is in a cutoff state. When the transistor is cut off, the electrical signal output by the protection subcircuit cannot be input to the drive subcircuit. The preset range can be reasonably set based on experience or actual needs, and is not limited here.

[0073] Therefore, the controller can judge the electrical signal output by the protection sub-circuit and output a control signal representing the corresponding judgment result to control the conduction and cutoff of the transistor. Furthermore, by controlling the conduction and cutoff of the transistor, it is determined whether the electrical signal output by the protection sub-circuit can be input to the drive sub-circuit, thus achieving further protection for the drive sub-circuit.

[0074] In some implementations, the detection subcircuit includes a voltage divider branch, which divides the electrical signal output by the protection subcircuit and then outputs a voltage-divided signal to the drive subcircuit.

[0075] For example, the protection sub-circuit can input an electrical signal to a voltage divider branch. The voltage divider branch can include components such as capacitors or resistors that can divide the input electrical signal. No specific limitations are placed on the circuit structure of the voltage divider branch; any circuit structure capable of achieving voltage division is within the scope of protection of this application. Thus, a second voltage division is achieved on the electrical signal output from the protection sub-circuit, and a further divided signal is output to the drive sub-circuit, thereby achieving further protection for the drive sub-circuit.

[0076] A second aspect of this application also provides a motor driving method applied to the driving circuit described above. Figure 5 is a schematic flowchart of a motor driving method provided in an embodiment of this application. For example, referring to Figure 5, the driving method may include:

[0077] Step S510: Control the motor winding to input a first electrical signal to the protection sub-circuit, so that the protection sub-circuit and the protection capacitor perform voltage division processing on the first electrical signal to generate a second electrical signal.

[0078] For example, the first electrical signal can be the coupled high voltage mentioned above. After the motor windings input the coupled high voltage to the protection sub-circuit, the protection sub-circuit and the protection capacitor can perform voltage division processing on the coupled high voltage to generate the second electrical signal, that is, the electrical signal after voltage division by the protection capacitor.

[0079] Step S520: Input a second electrical signal to the driver sub-circuit.

[0080] For example, after charging the protective capacitor using the protection sub-circuit, a second electrical signal can be obtained. The voltage value of the second electrical signal is less than the voltage value of the first electrical signal. The second electrical signal obtained after voltage division can be input to the driver sub-circuit to complete the withstand voltage test.

[0081] In some implementations, before inputting the second electrical signal to the driver sub-circuit, the method may further include: detecting whether the second electrical signal exceeds a preset range.

[0082] For example, before inputting the second electrical signal to the driver sub-circuit, it can be detected whether the second electrical signal exceeds a preset range, which can represent the parameter range of relevant electrical signals for the driver sub-circuit to function normally.

[0083] In some implementations, before inputting the second electrical signal to the driver sub-circuit, the method may further include: performing a voltage divider process on the second electrical signal to generate a third electrical signal. For example, a voltage divider circuit can be used to perform the voltage divider process on the second electrical signal to generate the third electrical signal, which is an electrical signal obtained after two voltage dividers. The third electrical signal can then be input to the driver sub-circuit.

[0084] A third aspect of this application also provides an electronic device. FIG6 is a schematic block diagram of an electronic device provided in an embodiment of this application. Referring to FIG6, for example, the electronic device 600 may include a processor 610 and a memory 620, wherein the memory 620 stores computer program instructions, which are executed by the processor 610 to perform the method described above.

[0085] A fourth aspect of this application also provides a storage medium storing program instructions that, when executed, perform the method described above. The storage medium may include, for example, a storage component of a tablet computer, a hard disk of a computer, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disc read-only memory (CD-ROM), a USB memory, or any combination of the above storage media. The computer-readable storage medium may be any combination of one or more computer-readable storage media.

[0086] A fifth aspect of this application also provides a range hood. Figure 7 is a schematic structural block diagram of a range hood provided in an embodiment of this application. Referring to Figure 7, the range hood 70 may simultaneously include the electronic device 600 as described above and the motor drive circuit 100 as described above. Alternatively, the range hood 70 may further include either the electronic device 600 or the motor drive circuit 100.

[0087] Those skilled in the art can understand the specific details and beneficial effects of the motor drive method, electronic equipment, storage medium, and smoke hood by reading the above description of the motor drive circuit, and will not be repeated here for the sake of brevity.

[0088] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and / or device can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0089] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0090] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0091] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0092] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A motor drive circuit, the drive circuit being used to drive a motor, the motor including a motor housing and motor windings, the drive circuit comprising: The protection sub-circuit, the drive sub-circuit, and the protection capacitor, wherein the protection sub-circuit includes a bridge circuit; The protection sub-circuit is electrically connected to the motor winding and the drive sub-circuit respectively. The protection sub-circuit and the protection capacitor are electrically connected to the same power supply. The motor winding is used to output coupled high voltage after coupling with the motor housing. The motor housing is equipped with a test high voltage. The drive sub-circuit is electrically connected to the motor, and the drive sub-circuit is used to drive the motor under the action of the drive control signal.

2. The motor drive circuit according to claim 1, wherein, The protection sub-circuit includes a first branch and a second branch; The first end of the first branch is electrically connected to the first output end of the motor, the second end of the first branch is electrically connected to the first end of the protection capacitor, and the second end of the protection capacitor is electrically connected to the second output end of the motor. The first end of the second branch is electrically connected to the second output terminal of the motor, the second end of the second branch is electrically connected to the first end of the protection capacitor, the second end of the protection capacitor is electrically connected to the first output terminal of the motor, wherein the first end of the protection capacitor is also electrically connected to the power supply, and the second end of the protection capacitor is used for grounding.

3. The motor drive circuit according to claim 2, wherein, Both the first branch and the second branch include diodes.

4. The motor drive circuit according to claim 3, wherein, The first branch includes a first diode and a second diode. The anode of the first diode is electrically connected to the first output terminal of the motor, the cathode of the first diode is electrically connected to the first terminal of the protection capacitor, the anode of the second diode is electrically connected to the second terminal of the protection capacitor, and the cathode of the second diode is electrically connected to the second output terminal of the motor. The second branch includes a third diode and a fourth diode. The positive terminal of the third diode is electrically connected to the second output terminal of the motor, and the negative terminal of the third diode is electrically connected to the first terminal of the protection capacitor. The positive terminal of the fourth diode is electrically connected to the second terminal of the protection capacitor, and the negative terminal of the fourth diode is electrically connected to the first output terminal of the motor.

5. The motor drive circuit according to claim 4, wherein, The first diode, the second diode, the third diode, and the fourth diode include Schottky barrier diodes.

6. The motor drive circuit according to claim 4, wherein, The first diode and the third diode are disposed adjacent to each other in a first region of the circuit board, the first region including the power supply. The second diode and the fourth diode are disposed adjacent to each other in a second region of the circuit board, the second region including a ground point. The first diode, the third diode, the second diode and the fourth diode are arranged sequentially along the same straight line direction.

7. The motor drive circuit according to any one of claims 1 to 6, wherein, The driving circuit further includes a detection sub-circuit, which is electrically connected between the protection sub-circuit and the driving sub-circuit.

8. The motor drive circuit according to claim 7, wherein, The detection sub-circuit includes a transistor and a controller. The controller is used to output a first control signal when the electrical signal output by the protection sub-circuit is within a preset range. The transistor is used to turn on under the action of the first control signal. The controller is used to output a second control signal when the electrical signal output by the protection sub-circuit exceeds the preset range, and the transistor is used to cut off under the action of the second control signal.

9. The motor drive circuit according to claim 7, wherein, The detection sub-circuit includes a voltage divider branch, which is used to divide the electrical signal output by the protection sub-circuit and then output a voltage-divided signal to the drive sub-circuit.

10. A motor driving method, applied to a driving circuit as described in any one of claims 1 to 9, the driving method comprising: The motor windings are controlled to input a first electrical signal to the protection sub-circuit, so that the protection sub-circuit and the protection capacitor perform voltage division processing on the first electrical signal to generate a second electrical signal; The second electrical signal is input to the driving sub-circuit.

11. The motor driving method according to claim 10, wherein, Before inputting the second electrical signal to the driving sub-circuit, the method further includes: Detect whether the second electrical signal exceeds the preset range.

12. The motor driving method according to claim 10, wherein, Before inputting the second electrical signal to the driving sub-circuit, the method further includes: The second electrical signal is divided to generate the third electrical signal; The method further includes: The third electrical signal is input to the driving sub-circuit.

13. An electronic device comprising a processor and a memory, wherein, The memory stores computer program instructions, which, when executed by the processor, are used to perform the motor drive method as described in any one of claims 10 to 12.

14. A storage medium storing program instructions that, when executed, perform the motor drive method as described in any one of claims 10 to 12.

15. A range hood, comprising: The electronic device as claimed in claim 13; and / or The motor drive circuit as described in any one of claims 1 to 9.

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