Motor drive circuit, drive method, electronic device, storage medium and range hood

Abstract

The present invention provides a motor drive circuit, a drive method, an electronic device, a storage medium, and a range hood. The invention relates to the field of electrical appliance technology. The circuit includes: a protection subcircuit, a drive 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 drive 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 drive subcircuit is electrically connected to the motor, and the drive subcircuit is used to drive the motor under the action of a drive control signal. This ensures that the electrical signal input to the drive subcircuit meets the normal operating parameter range of the drive subcircuit to a certain extent, reduces the risk of the drive subcircuit being broken down by the coupled high voltage, effectively protects the drive subcircuit, and reduces the economic losses caused by component damage.

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] Currently, due to motor size limitations, range hoods with small opening and closing motors have a relatively close distance between the motor's internal windings and the motor housing. The motor housing, in turn, is connected to the range hood's sheet metal housing. Therefore, during the withstand voltage test, due to the principle of high-voltage coupling, the motor's internal windings are coupled to the motor housing, inducing high voltage. This high voltage can cause breakdown of the motor's internal driver chips and other components that drive the motor, leading to damage and failure of the driver.

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

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

[0005] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended 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 being used to drive a motor, the motor including a motor housing and a motor winding, the drive circuit including:

[0007] a protection subcircuit, a driving subcircuit and a protection capacitor, wherein the protection subcircuit includes a bridge circuit;

[0008] The protection subcircuit is electrically connected to the motor winding and the drive 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 a test high voltage;

[0009] The driving sub-circuit is electrically connected to the motor, and is used to drive the motor under the action of a driving control signal.

[0010] In some embodiments, the protection subcircuit includes a first branch and a second branch;

[0011] The first end of the first branch is electrically connected to the first output terminal 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 terminal of the motor;

[0012] 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.

[0013] In some embodiments, the first branch and the second branch each include a diode.

[0014] 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;

[0015] 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.

[0016] In some embodiments, the first diode, the second diode, the third diode, and the fourth diode include Schottky barrier diodes.

[0017] 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.

[0018] In some embodiments, the driving circuit further includes a detection sub-circuit electrically connected between the protection sub-circuit and the driving sub-circuit.

[0019] In some embodiments, the detection subcircuit includes a transistor and a controller, the controller being configured to output a first control signal when the electrical signal output by the protection subcircuit is within a preset range, and the transistor being configured to be turned on under the action of the first control signal;

[0020] 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.

[0021] In some embodiments, the detection subcircuit includes a voltage dividing branch, which 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.

[0022] In a second aspect, a motor driving method is also proposed, which is applied to the driving circuit described above. The driving method includes:

[0023] 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;

[0024] A second electrical signal is input to the driving sub-circuit.

[0025] In some embodiments, before inputting the second electrical signal to the driving sub-circuit, the method further includes:

[0026] Detecting whether the second electrical signal exceeds a preset range.

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

[0028] performing voltage division processing on the second electrical signal to generate a third electrical signal;

[0029] The method also includes:

[0030] A third electrical signal is input to the driving sub-circuit.

[0031] In a third aspect, an electronic device is proposed, comprising 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-mentioned method when the processor is running.

[0032] 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 above method when running.

[0033] In a fifth aspect, a range hood is also proposed, comprising:

[0034] The electronic device as described above; and / or the motor drive circuit as described above.

[0035] According to the above technical solution, before the coupled high voltage is input to the driver subcircuit, the coupled high voltage can be discharged and reduced by the provided protection subcircuit and the protection capacitor connected to the same power supply as the protection subcircuit. This ensures that the electrical signal input to the driver subcircuit meets the normal operating parameter range of the driver subcircuit to a certain extent, reduces the risk of the driver subcircuit being broken down by the coupled high voltage, effectively protects the driver subcircuit, and reduces economic losses caused by component damage. The motor drive circuit of the present invention, as well as other advantages, objectives, and features of the present invention, will be partially reflected in the following description and will also be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 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.

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0038] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the exemplary embodiments below. The accompanying drawings are for illustration purposes only and are not to be considered limiting of the present application. Throughout the accompanying drawings, the same reference symbols denote the same components. In the accompanying drawings:

[0039] Figure 1 A schematic structural block diagram of a motor drive circuit provided in an embodiment of the present application;

[0040] Figure 2 A schematic block diagram illustrating the working principle of a protection sub-circuit provided in an embodiment of the present application;

[0041] Figure 3 A schematic circuit diagram illustrating the working principle of a protection sub-circuit provided in an embodiment of the present application;

[0042] Figure 4 A partial schematic diagram of a circuit board schematic provided in an embodiment of the present application;

[0043] Figure 5 A schematic flow chart of a motor driving method provided in an embodiment of the present application;

[0044] Figure 6 A schematic block diagram of an electronic device provided in an embodiment of the present application;

[0045] Figure 7 A schematic structural block diagram of a range hood provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0047] 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 numbers used in this way can be interchanged 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 variations thereof 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 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 embodiments described are only some embodiments of the present application, not all embodiments.

[0048] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present application, not all of the embodiments.

[0049] In order to solve the above technical problems, 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 1The motor drive 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 a coupled high voltage V2 after coupling with the motor housing 210. The protection sub-circuit 110 is electrically connected to the motor winding 220 and the drive sub-circuit 120, respectively, wherein 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 is used to drive the motor 200 under the action of the drive control signal IN.

[0050] Exemplarily, the above-mentioned motor can be applied to any mechanical equipment, industrial production equipment and household electrical appliances that use motor drive as the main driving mode. The motor housing can be connected to the sheet metal housing of the entire device. When the withstand voltage test is performed on the entire device, the test high voltage can be input to the device under test. Among them, the withstand voltage test can be used to test the ability of the device 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 device under test, and since the motor housing is connected to the housing of the entire device, the motor housing also has the above-mentioned external input when the withstand voltage test is performed. Figure 1 The test high voltage V1 is shown.

[0051] 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. For example, 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. For example, 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.

[0052] 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 through 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 1 When the motor winding 220 outputs the coupled high voltage V2 to the motor drive circuit 100, the coupled high voltage V2 is first given to the protection sub-circuit 110. The protection sub-circuit 110 may include a bridge circuit 111. The first terminal of the protection sub-circuit 110 is used to be electrically connected to the power supply V3, and the second terminal 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 to which the protection sub-circuit 110 and the protection capacitor 130 are connected is the same power supply, so 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 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 can be transmitted to the driving 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 driving sub-circuit 120.

[0053] Exemplarily, the protection capacitor can be any capacitor on a circuit board connected to the same power supply as the protection sub-circuit. In some embodiments, the protection capacitor can be a capacitor on the circuit board that is arranged before the input port of the driving sub-circuit and is closest to the driving sub-circuit. This ensures that the loop distance is shortest to reduce the loop impedance. Among them, the input port of the driving sub-circuit 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, with respect 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.

[0054] According to the above technical solution, before the coupled high voltage is input into the driving sub-circuit, the coupled high voltage can be discharged and reduced in voltage through the provided 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 into the driving sub-circuit meets the normal operating parameter range of the driving sub-circuit to a certain extent, reduces the risk of the driving sub-circuit being broken down by the coupled high voltage, effectively protects the driving sub-circuit, and reduces the economic losses caused by damage to components.

[0055] In some embodiments, the protection subcircuit includes a first branch and a second branch. Figure 2 This is a schematic block diagram of the working principle of a protection sub-circuit provided in an embodiment of the present application. For example, see Figure 2 The protection subcircuit 110 may include a first branch 112 and a second branch 113. A first end 1 of the first branch 112 is electrically connected to the first output terminal a of the motor 200, a second end 2 of the first branch 112 is electrically connected to the first end A of the protection capacitor 130, and a second end B of the protection capacitor 130 is electrically connected to the second output terminal 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 connected to the ground GND.

[0056] 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 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 reduced voltage 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 reduced in voltage through the above-mentioned pathway, and then the reduced voltage electrical signal is input to the drive sub-circuit.

[0057] For example, see 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.

[0058] See also Figure 2 , Figure 2The electrical signal transmission relationship between the devices and electronic components connected by the black lines 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 the discharged and reduced-voltage 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 reduced in voltage through the above-mentioned pathway, and then the reduced-voltage electrical signal is input to the drive sub-circuit.

[0059] Therefore, if a motor has multiple output ports, different branches within the protection subcircuit can be used to charge and discharge the protection capacitor, thereby protecting the drive subcircuit. In actual applications, a protection subcircuit with a corresponding number of branches can be selected based on the motor model, improving the adaptability of the protection subcircuit and increasing the effectiveness of protecting the drive subcircuit.

[0060] In some embodiments, both the first branch and the second branch may include diodes. 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. It can also avoid the situation where multiple branches charge the protection capacitor at the same time, causing breakdown and damage to the protection capacitor, and effectively avoid economic losses. In addition, the cost of diodes is low and will not increase excessive production costs.

[0061] Figure 3 A schematic circuit diagram of the working principle of a protection sub-circuit 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.

[0062] Exemplary, reference Figure 3When 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 discharged and reduced voltage 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 the discharged and reduced voltage 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 by the first output terminal a of the motor 200, the coupled high voltage can be discharged and reduced in voltage through the above-mentioned closed loop, and then the reduced voltage electrical signal is input to the drive sub-circuit.

[0063] For example, see Figure 3 The 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 end A of the protection capacitor C1, the anode of the fourth diode D4 is electrically connected to the second end 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.

[0064] 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 terminal B of the protection capacitor C1 outputs the discharged and reduced voltage 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 the discharged and reduced voltage 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 by the second output terminal b of the motor 200, the coupled high voltage can be discharged and reduced in voltage through the above-mentioned closed loop, and then the reduced voltage electrical signal is input to the drive sub-circuit.

[0065] Thus, a circuit structure including diodes can be used to form the first and second branches, respectively. The unidirectional conductivity of the diodes effectively prevents signal interference between the branches and prevents multiple branches from simultaneously charging the protection capacitor, which could cause breakdown and damage, effectively avoiding economic losses. Furthermore, the diodes are relatively low-cost and do not increase production costs excessively.

[0066] In some embodiments, the first diode, the second diode, the third diode, and the fourth diode include Schottky barrier diodes. Exemplarily, Schottky barrier diodes are diodes fabricated using the Schottky barrier effect and have advantages such as low forward voltage drop, fast switching speed, and low power consumption. Using Schottky barrier diodes to form the circuit structure of the first branch and the second branch ensures that the first branch and the second branch can quickly respond to coupled high voltages, thereby improving the protection efficiency of the entire protection sub-circuit for the driver sub-circuit.

[0067] Figure 4 This is a partial schematic diagram of a circuit board schematic 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 to GND. On the circuit board, the second diode D2 and the fourth diode D4 can be arranged adjacent to each other in the second area including the ground point. This ensures shorter wiring and cleaner routing. With shorter wiring, loop impedance can be reduced. For example, 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. Figure 4 The first diode D1, the third diode D3, the second diode D2, and the fourth diode D4 are arranged sequentially from left to right along the same straight line. For example, the first diode D1, the third diode D3, the second diode D2, and the fourth diode D4 can also be arranged sequentially from right to left along the same straight line. In this arrangement, the positions of the power supply and the grounding point are also swapped.

[0068] In some embodiments, the driving circuit further includes a detection subcircuit, which 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.

[0069] In some embodiments, the detection subcircuit may include a transistor and a controller, the controller being configured to output a first control signal when the electrical signal output by the protection subcircuit is within a preset range, and the transistor being configured to be turned on under the action of the first control signal; the controller being configured to output a second control signal when the electrical signal output by the protection subcircuit exceeds a preset range, and the transistor being configured to be turned off under the action of the second control signal.

[0070] Exemplarily, the protection subcircuit can input an electrical signal into a controller, which can then 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 implemented using a processor chip such as a single-chip microcomputer, microprocessor, programmable logic controller (PLC), digital signal processor (DSP), field-programmable gate array (FPGA), programmable logic array (PLA), or application-specific integrated circuit (ASIC), along with its peripheral circuits. This controller can be the same as or different from the controller previously described for outputting the drive control signal. 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 a transistor. 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 be input into the drive subcircuit via 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 turned off. When the transistor is turned off, the electrical signal output by the protection subcircuit cannot be input into the drive subcircuit. The preset range can be reasonably set based on experience or actual needs and is not limited here.

[0071] Thus, the controller can judge the electrical signal output by the protection subcircuit and output a control signal representing the corresponding judgment result to control the conduction and cutoff of the transistor. Furthermore, the conduction and cutoff of the transistor determine whether the electrical signal output by the protection subcircuit can be input to the driver subcircuit, thus achieving further protection for the driver subcircuit.

[0072] In some embodiments, the detection subcircuit includes a voltage dividing branch, which 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.

[0073] For example, the protection subcircuit can input an electrical signal into a voltage-dividing branch. The voltage-dividing branch can include components such as capacitors or resistors that can divide the input electrical signal. The circuit structure of the voltage-dividing branch is not specifically limited herein; any circuit structure capable of implementing a voltage-dividing function is within the scope of protection of this application. This achieves a secondary voltage division of the primary voltage-divided electrical signal output by the protection subcircuit, and further outputs the further voltage-divided signal to the driver subcircuit, thereby further protecting the driver subcircuit.

[0074] 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 This is 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:

[0075] 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.

[0076] Exemplarily, the first electrical signal can be the coupled high voltage mentioned above. After controlling the motor winding to input the coupled high voltage to the protection sub-circuit, the protection sub-circuit and the protection capacitor can divide the coupled high voltage to generate a second electrical signal, that is, the electrical signal after the protection capacitor divides the voltage.

[0077] Step S520: input a second electrical signal to the driving sub-circuit.

[0078] For example, after charging the protection capacitor using the protection subcircuit, 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 into the driving subcircuit to complete the voltage withstand test.

[0079] In some embodiments, 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.

[0080] Illustratively, before inputting the second electrical signal to the driving sub-circuit, it may be detected whether the second electrical signal exceeds a preset range. The preset range may represent a parameter range of the relevant electrical signal within which the driving sub-circuit can operate normally.

[0081] In some embodiments, before inputting the second electrical signal to the driver sub-circuit, the method may further include: performing voltage division processing on the second electrical signal to generate a third electrical signal. For example, a voltage divider circuit may be used to perform voltage division processing on the second electrical signal to generate the third electrical signal, where the third electrical signal is the result of two voltage divisions. This third electrical signal may then be input to the driver sub-circuit.

[0082] According to a third aspect of the embodiments of the present application, an electronic device is also proposed. Figure 6 This is 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 runs.

[0083] In a fourth aspect of the embodiments of the present application, a storage medium is further provided, 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.

[0084] 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 further include one of the electronic device 600 and the motor drive circuit 100.

[0085] A person skilled in the art can 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 repeated here for the sake of brevity.

[0086] In the several embodiments provided in this 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 merely schematic. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, 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.

[0087] Units described as separate components may or may not be physically separate, and 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 these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0088] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0089] 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, 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 and includes a number of instructions for enabling 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 code.

[0090] 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 above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. 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 including 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 drive 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 being coupled to the motor housing, and the motor housing carries a test high voltage; The driving sub-circuit is electrically connected to the motor, and the driving sub-circuit is used to drive the motor under the action of a driving control signal; The protection capacitor is a capacitor disposed on the circuit board before the input port of the driver subcircuit and closest to the driver subcircuit; the input port of the driver subcircuit is a port for receiving a test high voltage from the motor in a test mode, and the input port of the driver subcircuit is used to provide a drive signal to the motor in a normal mode; The driving circuit further includes a detection sub-circuit electrically connected between the protection sub-circuit and the driving sub-circuit.

2. The motor drive circuit according to claim 1, wherein: 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, wherein: 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 claim 1, wherein: The detection subcircuit includes a transistor and a controller, wherein the controller is configured to output a first control signal when the electrical signal output by the protection subcircuit is within a preset range, and the transistor is configured to be turned on under the action of the first control signal; The controller is configured to output a second control signal when the electrical signal output by the protection subcircuit exceeds the preset range, and the transistor is configured to be cut off under the action of the second control signal.

8. The motor drive circuit according to claim 1, wherein: The detection subcircuit includes a voltage dividing branch, which is used to divide the voltage of the electrical signal output by the protection subcircuit and then output a divided voltage signal to the driving subcircuit.

9. A motor driving method, characterized in that: Applied to the driving circuit according to any one of claims 1 to 8, 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.

10. The motor driving method according to claim 9, wherein: Before inputting the second electrical signal to the driving sub-circuit, the method further includes: Detecting whether the second electrical signal exceeds a preset range.

11. The motor driving method according to claim 9, wherein: 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.

12. An electronic device, characterized in that: The method comprises 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 motor driving method according to any one of claims 9 to 11 when the processor is running the computer program instructions. 13 . A storage medium having program instructions stored thereon, wherein the program instructions are used to execute the motor driving method according to claim 9 when running.

14. A range hood, characterized in that: include: The electronic device according to claim 12; and / or The motor drive circuit according to any one of claims 1 to 8.

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