Motor driving circuit, driving method, electronic equipment, storage medium and range hood

Abstract

The invention provides a motor driving circuit, a driving method, electronic equipment, a storage medium and a range hood. Relates to the technical field of appliances. The circuit comprises a protection sub-circuit, a driving sub-circuit and a protection capacitor, wherein the protection sub-circuit comprises a bridge circuit; the protection sub-circuit is electrically connected with the motor winding and the driving sub-circuit, the protection sub-circuit and the protection capacitor are electrically connected to the same power supply, the motor winding is used for outputting coupled high-voltage electricity after being coupled with a motor shell, and the motor shell is provided with test high-voltage electricity; and the driving sub-circuit is electrically connected with the motor and is used for driving the motor under the action of the driving control signal. Therefore, it can be ensured that the electric signal input to the driving sub-circuit meets the normal working parameter range of the driving sub-circuit to a certain extent, the risk that the driving sub-circuit is broken down by coupling high voltage is reduced, the driving sub-circuit is effectively protected, and economic losses caused by damage of components are reduced.

Description

Technical Field

[0001] The present invention 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 range hood. Background Art

[0002] At present, due to the size limitation of the motor, the distance between the winding inside the motor and the motor housing body of the range hood with a small opening and closing motor is relatively close, and the motor housing body is connected to the sheet metal housing of the range hood. Therefore, when the whole machine is subjected to a withstand voltage test, according to the high-voltage coupling principle, the winding inside the motor is coupled with a high voltage through the motor housing body. This high voltage may cause the driver chip inside the range hood to be broken down, thereby causing the driver device to be damaged and fail.

[0003] However, the existing motor protection circuit has poor anti-breakdown performance and high requirements for component design, which can easily lead to a significant increase in production costs and may not be universally applicable to most products, resulting in poor applicability.

[0004] Therefore, a new technical solution is urgently needed to solve the above technical problems. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] In a first aspect, the present invention provides a motor drive circuit, the drive circuit is used to drive a motor, the motor includes a motor housing and a motor winding, and the drive circuit includes: A protection subcircuit, a driving subcircuit and a protection capacitor, wherein the protection subcircuit includes a bridge circuit; The protection subcircuit is electrically connected to the motor winding and the driving subcircuit respectively, wherein the protection subcircuit 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, and the motor housing carries the test high voltage; The driving subcircuit is electrically connected to the motor, and is used to drive the motor under the action of a driving control signal.

[0007] In some embodiments, the protection subcircuit 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, and 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.

[0008] In some embodiments, the first branch and the second branch each include a diode.

[0009] In some embodiments, 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 end of the protection capacitor, the anode of the second diode is electrically connected to the second end 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 anode of the third diode is electrically connected to the second output terminal of the motor, the cathode of the third diode is electrically connected to the first end of the protection capacitor, the anode of the fourth diode is electrically connected to the second end of the protection capacitor, and the cathode of the fourth diode is electrically connected to the first output terminal of the motor.

[0010] In some embodiments, the first diode, the second diode, the third diode, and the fourth diode include Schottky barrier diodes.

[0011] In some embodiments, the first diode and the third diode are adjacently arranged in a first area of ​​the circuit board, the first area includes a power supply, the second diode and the fourth diode are adjacently arranged in a second area of ​​the circuit board, the second area includes a grounding point, and the first diode, the third diode, the second diode and the fourth diode are arranged in sequence along the same straight line direction.

[0012] In some embodiments, the driving circuit further includes a detection subcircuit electrically connected between the protection subcircuit and the driving subcircuit.

[0013] In some embodiments, the detection subcircuit includes 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 be turned 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 subcircuit exceeds a preset range, and the transistor is used to be cut off under the action of the second control signal.

[0014] In some embodiments, the detection subcircuit includes a voltage dividing branch, and the voltage dividing branch is used to divide the voltage of the electrical signal output by the protection subcircuit and then output the divided voltage signal to the driving subcircuit.

[0015] In a second aspect, a motor driving method is also proposed, which is applied to the driving circuit as described above, and the driving method includes: Controlling the motor winding to input a first electrical signal to the protection subcircuit, so that the protection subcircuit and the protection capacitor perform voltage division processing on the first electrical signal to generate a second electrical signal; A second electrical signal is input to the driving sub-circuit.

[0016] In some implementations, before inputting the second electrical signal to the driving sub-circuit, the method further includes: Detect whether the second electrical signal exceeds a preset range.

[0017] In some implementations, before inputting the second electrical signal to the driving sub-circuit, the method further includes: Performing voltage division processing on the second electrical signal to generate a third electrical signal; The method also includes: A third electrical signal is input to the driving sub-circuit.

[0018] In a third aspect, an electronic device is also proposed, including a processor and a memory, wherein the memory stores computer program instructions, and the computer program instructions are used by the processor to execute the above method when executed.

[0019] In a fourth aspect, a storage medium is also proposed, on which program instructions are stored, and the program instructions are used to execute the method as described above when running.

[0020] In a fifth aspect, a range hood is also provided, comprising: The electronic device as described above; and / or the motor drive circuit as described above.

[0021] According to the above technical solution, before the coupled high voltage is input to the driving subcircuit, the coupled high voltage can be discharged and reduced in voltage by the provided protection subcircuit and the protection capacitor connected to the same power supply as the protection subcircuit, thereby ensuring that the electrical signal input to the driving subcircuit meets the normal working parameter range of the driving subcircuit to a certain extent, reducing the risk of the driving subcircuit being broken down by the coupled high voltage, effectively protecting the driving subcircuit, and reducing the economic losses caused by damage to components. The motor driving circuit of the present invention, other advantages, objectives and features of the present invention will be partially reflected in the following description, and partly will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the exemplary embodiments below. The accompanying drawings are only for the purpose of illustrating exemplary embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 A schematic structural block diagram of a motor drive circuit provided in an embodiment of the present application; Figure 2 A schematic block diagram of the working principle of a protection sub-circuit provided in an embodiment of the present application; Figure 3 A schematic circuit diagram of the working principle of a protection sub-circuit provided in an embodiment of the present application; Figure 4 A partial schematic diagram of a circuit board schematic provided in an embodiment of the present application; Figure 5 A schematic flow chart of a motor driving method provided in an embodiment of the present application; Figure 6 A schematic block diagram of an electronic device provided in an embodiment of the present application; Figure 7 A schematic structural block diagram of a range hood provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0026] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0028] In order to solve the above technical problem, according to a first aspect of the present application, a motor drive circuit is proposed. Figure 1 This is a schematic structural block diagram of a motor drive circuit provided in an embodiment of the present application. For example, see Figure 1 The motor drive circuit 100 may include: a protection subcircuit 110, a drive subcircuit 120 and a protection capacitor 130. The protection subcircuit 110 may include a bridge circuit 111. For example, see Figure 1 , the motor driving circuit 100 is used to drive the 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 V1, and the motor winding 220 is used to output the coupled high voltage V2 after coupling with the motor housing 210. The protection subcircuit 110 is electrically connected to the motor winding 220 and the driving subcircuit 120 respectively, wherein the protection subcircuit 110 and the protection capacitor 130 are electrically connected to the same power supply V3. The driving subcircuit 120 is electrically connected to the motor 200, and the driving subcircuit 120 is used to drive the motor 200 under the action of the driving control signal IN.

[0029] Exemplarily, the above-mentioned motor can be applied to any mechanical equipment, industrial production equipment and household electrical appliances that are mainly driven by motors. The motor housing can be connected to the sheet metal housing of the entire equipment. When the whole machine is subjected to a withstand voltage test, the test high voltage can be input into the tested equipment. Among them, the withstand voltage test can be used to verify the ability of the equipment and its electrical circuits to withstand overvoltage. The voltage of the test high voltage can be one to several times the rated voltage of the tested equipment. Since the motor housing is connected to the housing of the entire equipment, the motor housing also carries the above-mentioned external input when the withstand voltage test is performed. Figure 1 The test high voltage V1 is shown.

[0030] refer to Figure 1 , in the driving mode, the motor driving circuit 100 is used to drive the motor 200. For example, the driving sub-circuit 120 can generate a corresponding driving signal OUT under the action of the driving control signal IN. The driving sub-circuit 120 can input the driving signal OUT to the motor 200 to drive the motor 200 using the driving signal OUT. Among them, the driving control signal IN can come from a control device such as a controller that can generate control instructions. Exemplarily, the controller can be built with electronic components such as comparators, registers, and digital logic circuits, or it can be implemented using processor chips such as single-chip microcomputers, microprocessors, programmable logic controllers (PLCs), digital signal processors (DSPs), field programmable gate arrays (FPGAs), programmable logic arrays (PLAs), application-specific integrated circuits (ASICs), and their peripheral circuits. Exemplarily, see Figure 1 The driving sub-circuit 120 can generate a driving signal OUT under the action of the driving control signal IN. The driving signal OUT can be used to drive the motor 200 to start, adjust the speed, brake and reverse.

[0031] See also Figure 1 In the test mode, the motor 200 can input a test electrical signal to the drive sub-circuit 120. Figure 1 , when the motor housing 210 of the motor 200 carries a test high voltage, since the distance between the motor winding 220 and the motor housing 210 is relatively close, the motor winding 220 can output a coupled high voltage V2 by means of high-voltage coupling, wherein the coupled high voltage V2 output by the motor winding 220 can be the test electrical signal input by the aforementioned motor 200 to the driving 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 may not be equal. When the voltage value of the test high voltage is fixed, the voltage value of the coupled high voltage may be related to the distance between the motor winding 220 and the motor housing 210, and may also be related to the parameters of the motor winding 220 itself. For example, see Figure 1When the motor winding 220 outputs the coupled high voltage V2 to the motor driving circuit 100, the coupled high voltage V2 is firstly given to the protection sub-circuit 110. The protection sub-circuit 110 may include a bridge circuit 111. The first end of the protection sub-circuit 110 is used to be electrically connected to the power source V3, and the second end of the protection sub-circuit 110 is used to be grounded GND. Figure 1 , one end of the protection capacitor 130 is also electrically connected to the power supply V3, and the other end is grounded GND. Among them, the power supply V3 connected to the protection subcircuit 110 and the protection capacitor 130 is the same power supply, so it can be considered that the protection subcircuit 110 and the protection capacitor 130 are connected at the same potential. When there is an external input to the protection subcircuit 110, the input electrical signal can be first transmitted to the protection capacitor 130 to charge the protection capacitor 130. In the process of charging the protection capacitor 130, the coupled high voltage V2 can be discharged and reduced in voltage, and then the reduced voltage electrical signal is transmitted to the driving subcircuit 120. Exemplarily, 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 driving subcircuit 120.

[0032] Exemplarily, the protection capacitor can be any capacitor on a circuit board connected to the same power supply as the protection subcircuit. In some embodiments, the protection capacitor can be a capacitor on the circuit board that is arranged before the input port of the driving subcircuit and is closest to the driving subcircuit. This can ensure that the loop distance is the shortest to reduce the loop impedance. Among them, the input port of the driving subcircuit can be a port for receiving a test high voltage from the motor in the test mode. The input port is used to provide a drive signal to the motor in the normal mode. Therefore, relative to the motor, in the test mode, the port is an input port; in the normal mode, the port is an output port. That is, the motor and the motor drive circuit can transmit signals to each other to achieve different functions.

[0033] 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 in voltage through the set protection sub-circuit and the protection capacitor connected to the same power supply as the protection sub-circuit, thereby ensuring that the electrical signal input to the driving sub-circuit meets the normal working parameter range of the driving sub-circuit to a certain extent, reducing the risk of the driving sub-circuit being broken down by the coupled high voltage, effectively protecting the driving sub-circuit, and reducing the economic losses caused by damage to components.

[0034] In some embodiments, the protection subcircuit includes a first branch and a second branch. Figure 2 A schematic block diagram of the working principle of a protection subcircuit provided in an embodiment of the present application. For example, see Figure 2The protection subcircuit 110 may include a first branch 112 and a second branch 113. The first end 1 of the first branch 112 is electrically connected to the first output end a of the motor 200, the second end 2 of the first branch 112 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 second output end b of the motor 200. The first end A of the protection capacitor 130 is also electrically connected to the power supply V3, and the second end B of the protection capacitor is used for grounding GND.

[0035] Exemplary, reference Figure 2 , Figure 2 The electrical signal transmission relationship between the devices and electronic components connected by the gray lines in the figure can be: 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 subcircuit 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, the high voltage signal output by the second terminal 2 of the first branch 112 is used to charge and discharge the protection capacitor 130 → the second terminal B of the protection capacitor 130 outputs an electrical signal after energy discharge and voltage reduction 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-mentioned path, and then the voltage-reduced electrical signal is input to the driving subcircuit.

[0036] For example, see Figure 2 The first end 3 of the second branch 113 is electrically connected to the second output terminal 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 terminal a of the motor 200 .

[0037] See also Figure 2 , Figure 2 The electrical signal transmission relationship between the devices and electronic components connected by the black lines can be: 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 subcircuit 110, and 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, and uses the high-voltage signal output by 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 the electrical signal after energy discharge and voltage reduction 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-mentioned path, and then the voltage-reduced electrical signal is input to the driving subcircuit.

[0038] Therefore, when the motor has multiple output ports, different branches in the protection subcircuit can be used to charge and discharge the protection capacitor to protect the drive subcircuit. In actual application, a protection subcircuit with a corresponding number of branches can be selected according to the model of the motor, which improves the adaptability of the protection subcircuit and increases the effectiveness of the protection of the drive subcircuit.

[0039] In some embodiments, both the first branch and the second branch may include a diode. Exemplarily, in combination with the foregoing, in the case where different output ports of the motor output high-voltage electrical signals, different branches in the protection subcircuit can be used to charge and discharge the protection capacitor. Exemplarily, diodes can be set in both the first branch and the second branch. According to the unidirectional conductivity of the diode, signal interference between the branches can be effectively avoided, and the situation where multiple branches charge the protection capacitor at the same time, causing the protection capacitor to be damaged by breakdown, can be avoided, and economic losses can be effectively avoided. In addition, the cost of diodes is relatively low and will not increase excessive production costs.

[0040] Figure 3 A schematic circuit diagram of the working principle of a protection subcircuit provided in an embodiment of the present application. For example, see 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.

[0041] Exemplary, reference Figure 3 , when the first output terminal a of the motor 200 outputs a coupled high voltage, 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 discharged, the second terminal B of the protection capacitor C1 outputs the electrical signal after energy discharge and voltage reduction 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 the electrical signal after energy discharge and voltage reduction 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 by the first output terminal a of the motor 200, the coupled high voltage can be discharged and voltage reduced through the above-mentioned closed loop, and then the voltage-reduced electrical signal is input to the drive sub-circuit.

[0042] For example, see Figure 3The second branch 113 includes a third diode D3 and a fourth diode D4, the anode of the third diode D3 is electrically connected to the second output terminal b of the motor 200, the cathode of the third diode D3 is electrically connected to the first terminal A of the protection capacitor C1, the anode of the fourth diode D4 is electrically connected to the second terminal B of the protection capacitor C1, and the cathode of the fourth diode D4 is electrically connected to the first output terminal a of the motor 200.

[0043] refer to Figure 3 , when the second output terminal b of the motor 200 outputs a coupled high voltage, due to the unidirectional conductivity of the diode, the high voltage signal can only be input to the protection capacitor C1 through the third diode D3 of the second branch 113. After the protection capacitor C1 is charged and discharged, the second end B of the protection capacitor C1 outputs an electrical signal after energy discharge and voltage reduction 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 end B of the protection capacitor C1 outputs an electrical signal after energy discharge and voltage reduction 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 by the second output terminal b of the motor 200, the coupled high voltage can be discharged and voltage reduced through the above-mentioned closed loop, and then the voltage-reduced electrical signal is input to the drive sub-circuit.

[0044] Thus, the first branch and the second branch can be formed respectively by a circuit structure including a diode, and the unidirectional conductivity of the diode can effectively avoid signal interference between the branches, and can also avoid the situation where multiple branches charge the protection capacitor at the same time, causing the protection capacitor to be broken down and damaged, thereby effectively avoiding economic losses. In addition, the cost of the diode is low and will not increase excessive production costs.

[0045] In some embodiments, the first diode, the second diode, the third diode, and the fourth diode include Schottky barrier diodes. Exemplarily, the Schottky barrier diode is a diode made using the Schottky barrier effect, and has the advantages of low forward voltage drop, fast switching speed, and low power consumption. The circuit structure of the first branch and the second branch formed using Schottky barrier diodes can ensure that the first branch and the second branch can quickly respond to the coupled high voltage, thereby improving the protection efficiency of the entire protection subcircuit on the driving subcircuit.

[0046] Figure 4 A partial schematic diagram of a circuit board schematic diagram provided in an embodiment of the present application. For example, see Figure 4, the first diode D1 and the third diode D3 are adjacently arranged in the first area 410 of the circuit board, and the first area 410 includes the power supply +12V. The second diode D2 and the fourth diode D4 are adjacently arranged in the second area 420 of the circuit board, and the second area 420 includes the ground point GND. For example, see Figure 3 , the cathodes of the first diode D1 and the third diode D3 are both electrically connected to the power supply +12V. It should be noted that 12V is only exemplary and does not mean a limitation on the power supply voltage. In the case where the cathodes of the first diode D1 and the third diode D3 are both connected to the same power supply, the first diode D1 and the third diode D3 are arranged adjacent to each other in the first area including the power supply on the circuit board. Similarly, see Figure 3 , the anodes of the second diode D2 and the fourth diode D4 are both grounded GND, and the second diode D2 and the fourth diode D4 can be arranged adjacent to each other in the second area including the grounding point on the circuit board. This can ensure that the wiring is shorter and the wiring is cleaner and tidier. In the case of shorter wiring, the loop impedance can be reduced. Exemplarily, the first diode D1, the third diode D3, the second diode D2 and the fourth diode D4 are arranged in sequence along the same straight line direction. See Figure 4 , the first diode D1, the third diode D3, the second diode D2 and the fourth diode D4 are arranged in sequence from left to right along the same straight line direction. Exemplarily, the first diode D1, the third diode D3, the second diode D2 and the fourth diode D4 can also be arranged in sequence from right to left along the same straight line direction. In this arrangement, the positions of the power supply and the grounding point are also exchanged.

[0047] In some embodiments, the driving circuit further includes a detection subcircuit, and the detection subcircuit can be electrically connected between the protection subcircuit and the driving subcircuit. Exemplarily, the detection subcircuit can be used to detect whether the divided electrical signal output by the protection subcircuit meets the requirements of the relevant electrical signal under the normal working state of the driving subcircuit. If the requirements are met, the electrical signal can be normally output to the driving subcircuit, and if the requirements are not met, no electrical signal is output to the driving subcircuit. Exemplarily, when it is detected that the requirements are not met, any existing or future electronic circuit, device or module that can realize the voltage division function can be used to further divide the detected electrical signal to obtain a new divided electrical signal, and the electrical signal is input to the driving subcircuit, which can ensure the normal operation of the driving subcircuit and achieve further protection of the driving subcircuit.

[0048] In some embodiments, the detection subcircuit may include a transistor and a controller, wherein 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 be turned 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 subcircuit exceeds a preset range, and the transistor is used to be cut off under the action of the second control signal.

[0049] Exemplarily, the protection subcircuit can input an electrical signal to the controller, and the controller can determine whether the input electrical signal is within a preset range. Exemplarily, the controller can be constructed using electronic components such as comparators, registers, and digital logic circuits, or can be implemented using processor chips such as single-chip microcomputers, microprocessors, programmable logic controllers (PLCs), digital signal processors (DSPs), field programmable gate arrays (FPGAs), programmable logic arrays (PLA), and application-specific integrated circuits (ASICs) and their peripheral circuits. The controller can be the same as or different from the controller for outputting the drive control signal described above. When the electrical signal output by the protection subcircuit is within a preset range, the controller can output a first control signal to the gate of the transistor, and under the action of the first control signal, the transistor can be turned on. When the transistor is turned on, the electrical signal output by the protection subcircuit can input the electrical signal to the drive subcircuit through the source and drain of the transistor. When the electrical signal output by the protection subcircuit is not within 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 cut-off 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.

[0050] Thus, the controller can judge the electrical signal output by the protection subcircuit, and output a control signal indicating the corresponding judgment result to control the on and off of the transistor. The on and off of the transistor can then be used to determine whether the electrical signal output by the protection subcircuit can be input to the drive subcircuit, thereby achieving further protection of the drive subcircuit.

[0051] In some embodiments, the detection subcircuit includes a voltage dividing branch, and the voltage dividing branch is used to divide the voltage of the electrical signal output by the protection subcircuit and then output the divided voltage signal to the driving subcircuit.

[0052] Exemplarily, the protection subcircuit can input an electrical signal into a voltage-dividing branch, and the voltage-dividing branch can include components such as capacitors or resistors that can divide the input electrical signal. No specific restrictions are imposed on the circuit structure of the voltage-dividing branch, and any circuit structure that can achieve the voltage-dividing function is within the protection scope of this application. Thus, the secondary voltage division of the primary voltage-divided electrical signal output by the protection subcircuit is achieved, and then the voltage-divided signal is output to the driving subcircuit, thereby achieving further protection of the driving subcircuit.

[0053] According to a second aspect of the embodiments of the present application, a motor driving method is also proposed, which is applied to the driving circuit as described above. Figure 5 A schematic flow chart of a motor driving method provided in an embodiment of the present application. For example, see Figure 5 , the driving method may include: Step S510: Control the motor winding to input a first electrical signal to the protection subcircuit, so that the protection subcircuit and the protection capacitor perform voltage division processing on the first electrical signal to generate a second electrical signal.

[0054] Exemplarily, the first electrical signal may be the coupled high voltage mentioned above. After controlling the motor winding to input the coupled high voltage to the protection subcircuit, the protection subcircuit and the protection capacitor may divide the coupled high voltage to generate a second electrical signal, i.e., the electrical signal after the protection capacitor divides the voltage.

[0055] Step S520: input a second electrical signal to the driving sub-circuit.

[0056] Exemplarily, after charging the protection capacitor using the protection subcircuit, a second electrical signal can be obtained, and 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 into the driving subcircuit to complete the withstand voltage test.

[0057] In some implementations, before inputting the second electrical signal to the driving sub-circuit, the method may further include: detecting whether the second electrical signal exceeds a preset range.

[0058] Exemplarily, before inputting the second electrical signal to the driving sub-circuit, it may be detected whether the second electrical signal exceeds a preset range, and the preset range may represent a parameter range of the relevant electrical signal within which the driving sub-circuit can work normally.

[0059] In some embodiments, before inputting the second electrical signal to the driving sub-circuit, the method may further include: performing voltage division processing on the second electrical signal to generate a third electrical signal. Exemplarily, the second electrical signal may be subjected to voltage division processing by a voltage division circuit to generate a third electrical signal, the third electrical signal being an electrical signal obtained after two voltage divisions. The third electrical signal may then be input to the driving sub-circuit.

[0060] According to a third aspect of the embodiments of the present application, an electronic device is also proposed. Figure 6 A schematic block diagram of an electronic device provided in an embodiment of the present application. For example, see Figure 6 The electronic device 600 may include a processor 610 and a memory 620, wherein the memory 620 stores computer program instructions, and the computer program instructions are used to execute the above method when the processor 610 is running.

[0061] In a fourth aspect of the embodiment of the present application, a storage medium is further proposed, on which program instructions are stored, and the program instructions are used to execute the above method when running. 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 disk 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.

[0062] In a fifth aspect of the embodiments of the present application, a range hood is also proposed. Figure 7 This is a schematic structural block diagram of a range hood provided in an embodiment of the present application. Figure 7 The range hood 70 may include both the electronic device 600 and the motor drive circuit 100 as described above. For example, the range hood 70 may also include one of the electronic device 600 and the motor drive circuit 100.

[0063] A person of ordinary skill in the art may understand the specific details and beneficial effects of the motor driving method, electronic device, storage medium and range hood by reading the above description of the motor driving circuit, which will not be elaborated here for the sake of brevity.

[0064] In the several embodiments provided in the present application, it should be understood that the disclosed devices and / or equipment can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0065] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0066] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0067] If the integrated unit is implemented in the form of 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 the present application is essentially 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. The computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program codes.

[0068] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A motor drive circuit, characterized in that: The drive circuit is used to drive a motor, the motor includes a motor housing and a motor winding, and the drive circuit includes: A protection subcircuit, a driving subcircuit and a protection capacitor, wherein the protection subcircuit includes a bridge circuit; The protection subcircuit is electrically connected to the motor winding and the driving subcircuit respectively, wherein the protection subcircuit and the protection capacitor are electrically connected to the same power supply, the motor winding is used to output coupled high voltage electricity after coupling with the motor housing, and the motor housing carries a test high voltage electricity; The driving subcircuit is electrically connected to the motor, and the driving subcircuit is used to drive the motor under the action of a driving control signal.

2. The motor drive circuit according to claim 1, characterized in that: The protection subcircuit 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 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, 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, characterized in that: The first branch and the second branch each include a diode.

4. The motor drive circuit according to claim 3, characterized in that: 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 end of the protection capacitor, the anode of the second diode is electrically connected to the second end 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 anode of the third diode is electrically connected to the second output end of the motor, the cathode of the third diode is electrically connected to the first end of the protection capacitor, the anode of the fourth diode is electrically connected to the second end of the protection capacitor, and the cathode of the fourth diode is electrically connected to the first output end of the motor.

5. The motor drive circuit according to claim 4, characterized in that: 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, characterized in that: The first diode and the third diode are adjacently arranged in a first area of ​​a circuit board, the first area includes the power supply, the second diode and the fourth diode are adjacently arranged in a second area of ​​the circuit board, the second area includes a grounding point, and the first diode, the third diode, the second diode and the fourth diode are arranged in sequence along the same straight line direction.

7. The motor drive circuit according to any one of claims 1 to 6, characterized in that: The driving circuit further includes a detection subcircuit electrically connected between the protection subcircuit and the driving subcircuit.

8. The motor drive circuit according to claim 7, characterized in that: The detection subcircuit includes 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 be turned on under the action of the first control signal; The controller is used for outputting a second control signal when the electrical signal output by the protection subcircuit exceeds the preset range, and the transistor is used for being cut off under the action of the second control signal.

9. The motor drive circuit according to claim 7, characterized in that: The detection subcircuit comprises a voltage dividing branch, and the voltage dividing branch is used to divide the voltage of the electrical signal output by the protection subcircuit and then output a voltage dividing signal to the driving subcircuit.

10. A motor driving method, characterized in that: Applied to the driving circuit according to any one of claims 1 to 9, the driving method comprises: Controlling the motor winding to input a first electrical signal to the protection subcircuit, so that the protection subcircuit 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, characterized in that: Before inputting the second electrical signal to the driving sub-circuit, the method further includes: Detect whether the second electrical signal exceeds a preset range.

12. The motor driving method according to claim 10, characterized in that: Before inputting the second electrical signal to the driving sub-circuit, the method further includes: performing voltage division processing on the second electrical signal to generate a third electrical signal; The method further comprises: The third electrical signal is input to the driving sub-circuit.

13. An electronic device, characterized in that: The invention comprises a processor and a memory, wherein the memory stores computer program instructions, and the computer program instructions are used to execute the motor driving method according to any one of claims 10 to 12 when the processor is running. 14 . A storage medium having program instructions stored thereon, wherein the program instructions are used to execute the motor driving method according to claim 10 when running.

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

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