Motor control circuit, control method, motor and electric appliance

Abstract

The invention discloses a motor control circuit, a control method, a motor and an electric appliance. The motor control circuit comprises a power supply module, the input end of which is connected with a first voltage source, the output end of which is connected with an adjustable resistor module, and the control end of which is connected with a main control chip; the output end of the adjustable resistance module is connected with the positive terminal of the motor interface, and the negative terminal of the motor interface is connected with the reference ground; the motor interface is used for connecting a motor; and the main control chip is connected with the positive terminal of the motor interface and is used for acquiring the input voltage of the motor and adjusting the resistance value of the adjustable resistance module according to the input voltage of the motor, so that the input voltage of the motor is within a preset voltage interval. According to the invention, it can be ensured that the input voltage and the input current of the motor meet the requirement of normal operation, so that continuous normal operation of the motor is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to a motor control circuit, a control method, a motor and an electrical appliance. Background Art

[0002] Motors are widely used in various electrical appliances. Motors must meet two conditions to operate normally. First, the input voltage of the motor must be within the rated voltage range U1~U2; second, the input current of the motor must be greater than the minimum rated current Imin. The existing non-feedback motor control circuit cannot directly detect motor undervoltage, overvoltage and other abnormalities. If the voltage divider resistor connected in series with the motor is damaged or has an abnormal resistance, the input voltage and input current of the motor and the device current and voltage will exceed the normal range, causing damage to the motor or malfunction.

[0003] There is currently no effective solution to the problem that the voltage divider resistor connected in series with the motor in the prior art is damaged or has an abnormal resistance, causing the motor's input voltage and input current to exceed the normal range as well as the motor's voltage and current, resulting in motor damage or malfunction. Summary of the invention

[0004] The embodiments of the present invention provide a motor control circuit, a control method, a motor and an electrical appliance to solve the problem in the prior art that the voltage-dividing resistor connected in series with the motor is damaged or has an abnormal resistance value, causing the input voltage and input current of the motor and the voltage and current of the motor to exceed the normal range, resulting in damage to the motor or failure to operate normally.

[0005] In order to solve the above technical problems, the present invention provides a motor control circuit, the circuit comprising:

[0006] A power supply module, whose input end is connected to the first voltage source, whose output end is connected to the adjustable resistance module, and whose control end is connected to the main control chip;

[0007] The adjustable resistance module has an output end connected to the positive terminal of the motor interface, and the negative terminal of the motor interface is connected to the reference ground; the motor interface is used to connect the motor;

[0008] The main control chip is connected to the positive terminal of the motor interface, and is used to obtain the input voltage of the motor and adjust the resistance value of the adjustable resistance module according to the input voltage of the motor so that the input voltage of the motor is within a preset voltage range.

[0009] Furthermore, the adjustable resistance module includes:

[0010] at least two resistor units arranged in parallel,

[0011] The main control chip is used to switch the input resistance unit according to the input voltage of the motor, so as to adjust the resistance value of the adjustable resistance module.

[0012] Furthermore, the resistance unit comprises:

[0013] At least two resistors, the at least two resistors are arranged in series, and the positive terminal of the motor interface is connected between any two resistors of each resistor unit;

[0014] A second controllable switch is arranged in series with the at least two resistors, a control end of the second controllable switch is connected to the main control chip, and the second controllable switch is used to be turned on or off under the control of the main control chip, thereby controlling the switching of the resistance unit.

[0015] Furthermore, the power module comprises:

[0016] A first controllable switch, a first end of which is connected to the first voltage source, a second end of which is connected to a first terminal on the input side of the photoelectric coupler, and a control end of which is connected to the main control chip;

[0017] The photoelectric coupler has a second terminal on its input side connected to a reference ground, a first terminal on its output side connected to a second voltage source, and a second terminal on its output side connected to the adjustable resistance module.

[0018] Furthermore, the circuit further comprises:

[0019] The voltage-dividing resistor is arranged between the second terminal at the output side of the photoelectric coupler and the adjustable resistance module.

[0020] Furthermore, the circuit further comprises:

[0021] A current limiting resistor, a first end of which is connected between the second terminal on the output side of the photocoupler and the voltage dividing resistor, and a second end of which is connected to a reference ground.

[0022] Furthermore, the circuit further comprises:

[0023] a first diode, a first end of which is connected to a first terminal at an output side of the photocoupler, and a second end of which is connected between the current limiting resistor and a reference ground;

[0024] A second diode has a first end connected between the adjustable resistance module and the positive terminal of the motor interface, and a second end connected between the current limiting resistor and a reference ground.

[0025] The present invention also provides a motor, comprising the above motor control circuit.

[0026] The present invention also provides an electrical appliance, comprising the above motor.

[0027] Furthermore, the electrical appliance is an air conditioner.

[0028] The present invention also provides a control method, which is applied to the above motor control circuit, and the control method includes:

[0029] Get the input voltage of the motor;

[0030] The resistance value of the adjustable resistance module is adjusted according to the input voltage of the motor so that the input voltage of the motor is within a preset voltage range.

[0031] Further, adjusting the resistance value of the adjustable resistance module according to the input voltage of the motor so that the input voltage of the motor is within a preset voltage range includes:

[0032] Determining the interval in which the input voltage of the motor is located;

[0033] If the input voltage of the motor is greater than the upper limit of the preset voltage interval, the resistance of the adjustable resistance module is controlled to increase until the input voltage of the motor is less than or equal to the upper limit of the preset voltage interval;

[0034] If the input voltage of the motor is less than the lower limit of the preset voltage range, the resistance of the adjustable resistance module is controlled to decrease until the input voltage of the motor is greater than or equal to the lower limit of the preset voltage range.

[0035] The present invention also provides a computer-readable storage medium on which a computer program is stored, and the program implements the above control method when executed by a processor.

[0036] The present invention also provides an electronic device, comprising:

[0037] one or more processors;

[0038] The storage device is used to store one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the above-mentioned control method.

[0039] By applying the technical solution of the present invention, an adjustable resistance module is set at the voltage input end of the motor, the input voltage of the motor is obtained through the main control chip, and the resistance of the adjustable resistance module is adjusted according to the input voltage, so that the input voltage of the motor is within a preset voltage range. Since the internal resistance of the motor is determined, after the input voltage of the motor is within the preset voltage range, the current of the motor will also be within the preset current range, that is, it is ensured that the input voltage and input current of the motor both meet the normal operation requirements, thereby ensuring the continuous normal operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1is a structural diagram of a motor control circuit according to an embodiment of the present invention;

[0041] Figure 2 is a structural diagram of an adjustable resistance module according to an embodiment of the present invention;

[0042] Figure 3 is a flow chart of a control method according to an embodiment of the present invention;

[0043] Figure 4 is a flow chart of a control method according to another embodiment of the present invention;

[0044] Figure 5 FIG. 4 is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0047] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0048] It should be understood that although the terms first, second, third, etc. may be used to describe the resistor units in the embodiments of the present invention, the resistor units should not be limited to these terms. These terms are only used to distinguish different resistor units. For example, without departing from the scope of the embodiments of the present invention, the first resistor unit may also be referred to as the second resistor unit, and similarly, the second resistor unit may also be referred to as the first resistor unit.

[0049] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0050] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0051] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0052] Example 1

[0053] The motor must meet two conditions to operate normally. First, the input voltage of the motor must be within the rated voltage range U1~U2; second, the input current of the motor must be greater than the minimum rated current Imin. The existing feedback-free motor control circuit cannot directly detect abnormalities such as motor undervoltage and overvoltage. If the voltage divider resistor in series with the motor is damaged or has an abnormal resistance, the input voltage and input current of the motor will exceed the normal range, causing damage to the motor or failure to operate normally.

[0054] In view of the problem in the prior art that the voltage-dividing resistor connected in series with the motor is damaged or has an abnormal resistance value, causing the input voltage and input current of the motor and the voltage and current of the motor to exceed the normal range, resulting in damage to the motor or failure to operate normally, this embodiment provides a motor control circuit. Figure 1 is a structural diagram of a motor control circuit according to an embodiment of the present invention, Figure 1 As shown, the motor control circuit includes: a power supply module 10, whose input end is connected to a first voltage source, whose output end is connected to an adjustable resistance module, and whose control end is connected to a main control chip. An adjustable resistance module 20, whose output end is connected to the positive terminal of the motor interface CN1, and whose negative terminal of the motor interface CN1 is connected to a reference ground. The main control chip 30 is connected to the positive terminal of the motor interface CN1, and is used to obtain the input voltage of the motor, and adjust the resistance value of the adjustable resistance module 20 according to the input voltage, so that the input voltage of the motor is within a preset voltage range. Since the internal resistance of the motor is determined, after the input voltage of the motor is within the preset voltage range, the current of the motor will also be within the preset current range.

[0055] The motor control circuit of this embodiment is provided with an adjustable resistance module 20 at the voltage input end of the motor, the input voltage of the motor is obtained through the main control chip 30, and the resistance value of the adjustable resistance module 20 is adjusted according to the input voltage, so that the input voltage of the motor is within a preset voltage range. Since the internal resistance of the motor is determined, after the input voltage of the motor is within the preset voltage range, the current of the motor will also be within the preset current range, that is, it is ensured that the input voltage and input current of the motor both meet the normal operation requirements, thereby ensuring the continuous normal operation of the motor.

[0056] Figure 2 The structure diagram of the adjustable resistance module according to the embodiment of the present invention is as follows. In order to realize the adjustable resistance value of the adjustable resistance module, Figure 2 As shown, the adjustable resistance module 20 includes: at least two resistance units 201 arranged in parallel, and the main control chip 30 is used to switch the resistance unit according to the input voltage of the motor, so as to adjust the resistance value of the adjustable resistance module.

[0057] In order to facilitate the adjustment of the resistance value of the adjustable resistor module, the above-mentioned resistor unit 201 includes: at least two resistors, the at least two resistors are arranged in series, and the positive terminal of the motor interface CN1 is connected between any two resistors of each resistor unit; a second controllable switch is arranged in series with the at least two resistors, and the control end of the second controllable switch is connected to the main control chip 30, and the second controllable switch is used to turn on or off under the control of the main control chip, thereby controlling the switching of the corresponding resistor unit.

[0058] In this embodiment, the number of the resistor units 201 is three as an example, the first resistor unit includes a first resistor R1, a first switch tube Q1, and a second resistor R2 arranged in series, the second resistor unit includes a third resistor R3, a second switch tube Q2, and a fourth resistor R4 arranged in series, the third resistor unit includes a fifth resistor R5, a third switch tube Q3, and a sixth resistor R6 arranged in series, the control end of the first switch tube Q1 is connected to the control signal output terminal PWM of the main control chip 30 through the first bias resistor R01, the second switch tube Q2 is connected to the control signal output terminal PWM of the main control chip 30 through the second bias resistor R02, and the third switch tube Q3 is connected to the control signal output terminal PWM of the main control chip 30 through the third bias resistor R03. The resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 are all different.

[0059] When the input voltage Ux of the positive terminal of the motor interface is less than U1, the main control chip 30 controls the first switch tube Q1 to turn on, so that the positive terminal of the motor interface CN1 inputs the first voltage AD_U1; when U1≤Ux≤U2, the main control chip 30 controls the second switch tube Q2 to turn on, so that the positive terminal of the motor interface CN1 inputs the second voltage AD_U2; when Ux>U2, the main control chip 30 controls the third switch tube Q3 to turn on, so that the positive terminal of the motor interface CN1 inputs the third voltage AD_U3.

[0060] In order to power the motor, as mentioned above Figure 1 As described in, the power supply module includes: a first controllable switch Q4, a first end of which is connected to the first voltage source VCC1 through a seventh resistor R7, a second end of which is connected to the first terminal of the input side of the photoelectric coupler OC, and a control end of which is connected to the main control chip 30 through an eighth resistor R8; a photoelectric coupler OC, a second terminal of which is connected to the reference ground on the input side, a first terminal of which is connected to the second voltage source VCC2 on the output side, and a second terminal of which is connected to the adjustable resistance module 20 on the output side.

[0061] In order to divide the voltage across the adjustable resistance module, the motor control circuit further includes: a voltage dividing resistor R9, which is arranged between the second terminal on the output side of the photoelectric coupler OC and the adjustable resistance module.

[0062] In order to limit the magnitude of the current flowing through the adjustable resistance module 20, the above-mentioned motor control circuit also includes: a current limiting resistor 10, a first end of which is connected between the second terminal on the output side of the above-mentioned photoelectric coupler OC and the voltage divider resistor R9, and a second end of which is connected to the reference ground. The current output by the power supply module 10 is shunted by the current limiting resistor 10 to reduce the magnitude of the current flowing through the adjustable resistance module 20.

[0063] In order to control the current or voltage of the current limiting resistor R10 and thus protect the current limiting resistor R10, the motor control circuit further includes: a first diode D1, a first end of which is connected to a first terminal of the output side of the photocoupler OC, and a second end of which is connected between the current limiting resistor R10 and the reference ground.

[0064] Similarly, in order to protect the voltage divider resistor R9 and the resistor in the adjustable resistor module 20, the above-mentioned motor control circuit also includes: a second diode D2, whose first end is connected between the adjustable resistor module 20 and the positive terminal of the motor interface CN1, and whose second end is connected between the current limiting resistor R10 and the reference ground.

[0065] Example 2

[0066] This embodiment provides a motor, including the motor control circuit of the above embodiment, which is used to ensure that the input voltage and input current of the motor meet the normal operation requirements, thereby ensuring the continuous normal operation of the motor.

[0067] Example 3

[0068] This embodiment provides an electrical appliance, including the above-mentioned motor, which is used to ensure the continuous normal operation of the motor, thereby ensuring the normal operation of the electrical appliance.

[0069] In one embodiment of the present invention, the electrical appliance is an air conditioner.

[0070] Example 4

[0071] This embodiment provides a control method, which is applied to the motor control circuit of the above embodiment. Figure 3 is a flow chart of a control method according to an embodiment of the present invention, as shown in Figure 3 As shown, the control method includes:

[0072] S101, obtaining the input voltage of the motor.

[0073] S102, adjusting the resistance of the adjustable resistance module according to the input voltage of the motor so that the input voltage of the motor is within a preset voltage range.

[0074] In order to achieve adjustable resistance value of adjustable resistor module, Figure 2 As shown, the adjustable resistance module 20 includes: at least two resistance units 201 arranged in parallel, and the main control chip 30 is used to switch the resistance unit according to the input voltage of the motor, so as to adjust the resistance value of the adjustable resistance module.

[0075] In order to facilitate the adjustment of the resistance value of the adjustable resistor module, the above-mentioned resistor unit 201 includes: at least two resistors, the at least two resistors are arranged in series, and the positive terminal of the motor interface CN1 is connected between any two resistors of each resistor unit; a second controllable switch is arranged in series with the at least two resistors, and the control end of the second controllable switch is connected to the main control chip. The second controllable switch is used to turn on or off under the control of the main control chip, thereby controlling the switching of the resistor unit, thereby changing the resistance value of the adjustable resistor module.

[0076] The control method of this embodiment adjusts the resistance of the adjustable resistor module according to the input voltage of the motor, so that the input voltage of the motor is within a preset voltage range. Since the internal resistance of the motor is determined, after the input voltage of the motor is within the preset voltage range, the current of the motor will also be within the preset current range, that is, it is ensured that the input voltage and input current of the motor both meet the normal operation requirements, thereby ensuring the continuous normal operation of the motor.

[0077] Specifically, the resistance of the adjustable resistor module is adjusted according to the input voltage of the motor so that the input voltage of the motor is within a preset voltage range, including: judging the range where the input voltage of the motor is located; if the input voltage of the motor is greater than the upper limit value U2 of the preset voltage range, the resistance of the adjustable resistor module is controlled to increase until the input voltage of the motor is less than or equal to the upper limit value U2 of the preset voltage range; if the input voltage of the motor is less than the lower limit value U1 of the preset voltage range, the resistance of the adjustable resistor module is controlled to decrease until the input voltage of the motor is greater than or equal to the lower limit value U1 of the preset voltage range.

[0078] U1~U2 is the voltage range when the motor is in normal operation, Umin is the voltage when the motor is at the minimum rated current, Umin<U1, Umax is the voltage when the motor is overvoltage, Umax>U2, and a voltage of Umax continuously will cause irreversible damage to the motor. If the input voltage of the motor is less than or equal to Umin, the motor will be undervoltage. When the input voltage of the motor is less than U1, it is considered that the input voltage of the motor has the risk of continuing to drop to Umin. At this time, the resistance of the adjustable resistance module should be reduced to increase the input voltage of the motor; when the input voltage of the motor is greater than U2, it is considered that the input voltage of the motor has the risk of continuing to rise to Umax. At this time, the resistance of the adjustable resistance module should be increased to reduce the input voltage of the motor.

[0079] In this embodiment, the number of the resistor units 201 is three as an example, the first resistor unit includes a first resistor R1, a first switch tube Q1, and a second resistor R2 arranged in series, the second resistor unit includes a third resistor R3, a second switch tube Q2, and a fourth resistor R4 arranged in series, the third resistor unit includes a fifth resistor R5, a third switch tube Q3, and a sixth resistor R6 arranged in series, the control end of the first switch tube Q1 is connected to the control signal output terminal PWM of the main control chip 30 through the first bias resistor R01, the second switch tube Q2 is connected to the control signal output terminal PWM of the main control chip 30 through the second bias resistor R02, and the third switch tube Q3 is connected to the control signal output terminal PWM of the main control chip 30 through the third bias resistor R03. The resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 are all different.

[0080] Example 5

[0081] This embodiment provides another control method. Figure 4 is a flow chart of a control method according to another embodiment of the present invention, Figure 4 As shown, the method includes:

[0082] S1, the main control chip obtains the input voltage Ux of the positive terminal of the motor interface.

[0083] S2, determine the interval of the input voltage Ux of the positive terminal of the motor interface; if Ux<first threshold value U1, execute step S3; if the first threshold value U1≤Ux≤second threshold value U2, execute step S4; if Ux>second threshold value U2, execute step S5.

[0084] S3, controlling the resistance value of the adjustable resistance module to decrease by N ohms.

[0085] S4, controls the resistance value of the adjustable resistance module to remain unchanged.

[0086] S5, controlling the resistance value of the adjustable resistance module to increase by N ohms.

[0087] When Ux<U1, the input voltage of the motor is detected to be too small, and the resistance of the adjustable resistor module is controlled to decrease by N ohms (this value is adjustable) until AD_U is detected to be in the range of U1~U2, and the detection is continued at intervals of T1. When Ux>U2, the input voltage of the motor is detected to be too large, and the resistance of the adjustable resistor module is controlled to increase by N ohms (this value is adjustable) until AD_U is detected to be in the range of U1~U2, and the detection is continued at intervals of T1. When U1≤Ux≤U2, the output voltage and output current meet the working requirements of the motor, and the motor can work normally. The RK resistance remains unchanged and is continuously detected at intervals of T1 to determine whether the motor voltage is within the range of U1~U2.

[0088] Using the above solution, the input current and voltage detection of the feedback-free DC motor can be realized to determine whether the motor can operate normally, and automatically restore normal operation after detecting an abnormality.

[0089] Example 6

[0090] This embodiment provides a computer-readable storage medium having a computer program stored thereon, wherein the program implements the control method of the above embodiment when executed by a processor.

[0091] Example 7

[0092] This embodiment provides an electronic device, including:

[0093] one or more processors;

[0094] A storage device is used to store one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the method of the above-mentioned embodiment h.

[0095] Figure 5 FIG. 1 is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Figure 5 As shown, the device includes:

[0096] One or more processors 510 and memory 520, Figure 5 A processor 510 is taken as an example.

[0097] The electronic device may further include: an input device 530 and an output device 540 .

[0098] The processor 510, the memory 520, the input device 530 and the output device 540 may be connected via a bus or other means. Figure 5 The example of connecting through bus is taken in the following.

[0099] The memory 520 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to the control method in the embodiment of the present invention. The processor 510 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions and modules stored in the memory 520, that is, implementing the above method embodiment.

[0100] The memory 520 may include a program storage area and a data storage area, wherein the program storage area may store an application required for operating the device and at least one function; the data storage area may store data created according to the use of the control method, etc. In addition, the memory 520 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0101] The input device 530 can receive input digital or character information and generate key signal input related to user settings and function control of the electronic device. The output device 540 can include a display device such as a display screen.

[0102] The one or more modules are stored in the memory 520, and when executed by the one or more processors 510, perform the control method in any of the above method embodiments.

[0103] The electronic device can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the method provided by the embodiment of the present invention.

[0104] The electronic device of the embodiment of the present invention exists in various forms, including but not limited to:

[0105] (1) Mobile communication devices: These devices are characterized by their mobile communication functions and their main purpose is to provide voice and data communications. These terminals include: smart phones (such as iPhone), multimedia phones, functional phones, and low-end phones.

[0106] (2) Ultra-mobile personal computer devices: These devices fall into the category of personal computers, have computing and processing functions, and generally also have mobile Internet access features. These terminals include: PDA, MID and UMPC devices, such as iPad.

[0107] (3) Portable entertainment devices: These devices can display and play multimedia content. They include audio and video players (such as iPods), handheld game consoles, e-books, smart toys, and portable car navigation devices.

[0108] (4) Server: A device that provides computing services. The server consists of a processor, hard disk, memory, device bus, etc. The server is similar to the general computer architecture, but because it needs to provide highly reliable services, it has higher requirements in terms of processing power, stability, reliability, security, scalability, manageability, etc.

[0109] (5) Other electronic devices with data interaction functions, such as televisions, large-screen cars, etc.

[0110] The circuit embodiments described above are merely illustrative, wherein the modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, i.e., they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0111] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 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 invention.

Claims

1. A motor control circuit, characterized in that: The circuit comprises: A power supply module, whose input end is connected to the first voltage source, whose output end is connected to the adjustable resistance module, and whose control end is connected to the main control chip; The adjustable resistance module has an output end connected to the positive terminal of the motor interface, and the negative terminal of the motor interface is connected to the reference ground; the motor interface is used to connect the motor; The main control chip is connected to the positive terminal of the motor interface, and is used to obtain the input voltage of the motor, and adjust the resistance value of the adjustable resistance module according to the input voltage of the motor, so that the input voltage of the motor is within a preset voltage range; The power supply module includes: a first controllable switch, a first end of which is connected to the first voltage source, a second end of which is connected to the first terminal on the input side of the photoelectric coupler, and a control end of which is connected to the main control chip; the photoelectric coupler, a second terminal on the input side of which is connected to the reference ground, a first terminal on the output side of which is connected to the second voltage source, and a second terminal on the output side of which is connected to the adjustable resistance module.

2. The circuit according to claim 1, characterized in that The adjustable resistance module comprises: at least two resistor units arranged in parallel, The main control chip is used to switch the input resistance unit according to the input voltage of the motor, so as to adjust the resistance value of the adjustable resistance module.

3. The circuit according to claim 2, characterized in that The resistance unit comprises: At least two resistors, the at least two resistors are arranged in series, and the positive terminal of the motor interface is connected between any two resistors of each resistor unit; A second controllable switch is arranged in series with the at least two resistors, a control end of the second controllable switch is connected to the main control chip, and the second controllable switch is used to be turned on or off under the control of the main control chip, thereby controlling the switching of the resistance unit.

4. The circuit according to claim 1, characterized in that The circuit further comprises: The voltage-dividing resistor is arranged between the second terminal at the output side of the photoelectric coupler and the adjustable resistance module.

5. The circuit according to claim 1, characterized in that The circuit further comprises: A current limiting resistor, a first end of which is connected between the second terminal on the output side of the photocoupler and the voltage dividing resistor, and a second end of which is connected to a reference ground.

6. The circuit according to claim 5, characterized in that The circuit further comprises: a first diode, a first end of which is connected to a first terminal at an output side of the photocoupler, and a second end of which is connected between the current limiting resistor and a reference ground; A second diode has a first end connected between the adjustable resistance module and the positive terminal of the motor interface, and a second end connected between the current limiting resistor and a reference ground.

7. A motor, characterized in that: A motor control circuit comprising the motor control circuit according to any one of claims 1 to 6.

8. An electrical appliance, characterized in that: Includes the motor as claimed in claim 7.

9. The electrical appliance according to claim 8, characterized in that: The electrical appliance is an air conditioner.

10. A control method, applied to the motor control circuit according to any one of claims 1 to 6, characterized in that: The control method comprises: Get the input voltage of the motor; The resistance value of the adjustable resistance module is adjusted according to the input voltage of the motor so that the input voltage of the motor is within a preset voltage range.

11. The control method according to claim 10, characterized in that: Adjusting the resistance value of the adjustable resistance module according to the input voltage of the motor so that the input voltage of the motor is within a preset voltage range includes: Determining the interval in which the input voltage of the motor is located; If the input voltage of the motor is greater than the upper limit of the preset voltage interval, the resistance of the adjustable resistance module is controlled to increase until the input voltage of the motor is less than or equal to the upper limit of the preset voltage interval; If the input voltage of the motor is less than the lower limit of the preset voltage range, the resistance of the adjustable resistance module is controlled to decrease until the input voltage of the motor is greater than or equal to the lower limit of the preset voltage range.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to claim 10 or 11 is implemented.

13. An electronic device, characterized in that: include: one or more processors; A storage device for storing one or more programs, which, when executed by the one or more processors, enables the one or more processors to implement the method according to claim 10 or 11.

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