Magnetic suspension motor control circuit, control method and electric shaver

Abstract

The invention relates to a magnetic suspension motor control circuit and method and an electric shaver, and the circuit comprises a motor driving module which is connected with a magnetic suspension motor and is used for driving the magnetic suspension motor to switch between a first operation mode and a second operation mode based on a control signal; the voltage acquisition module is connected with the magnetic suspension motor and is used for acquiring voltage signals at two ends of the magnetic suspension motor; the control module is connected with the motor driving module and the voltage acquisition module and is used for generating a control signal based on the voltage signal; wherein in the first operation mode and the second operation mode, the rotation directions of the magnetic suspension motor are opposite. The magnetic suspension motor control circuit can flexibly and automatically adjust the swing amplitude of the shaver head.

Description

Technical Field

[0001] The present invention relates to the technical field of electric shavers, and particularly to a magnetic levitation motor control circuit, a control method, and an electric shaver. Background Art

[0002] At present, magnetic levitation motors are gradually applied to electric shavers due to their advantages such as no mechanical contact, high efficiency, energy saving, and low noise. The magnetic levitation motor drives the cutter head to vibrate at a high speed through electromagnetic force, and has the characteristics of being more stable and durable compared with traditional motors.

[0003] In the prior art, an electric shaver using a magnetic levitation motor controls the vibration of the cutter head of the shaver by a fixed voltage or open-loop PWM (Pulse Width Modulation).

[0004] However, the magnetic levitation motor control method in the prior art has the problem of unstable swing amplitude, and it is difficult to automatically adjust the swing amplitude according to shaving environments such as the density of beards and skin sensitivity, resulting in a poor shaving experience. Summary of the Invention

[0005] Based on this, in view of the above technical problems, it is necessary to provide a magnetic levitation motor control circuit, a control method, and an electric shaver that can automatically adjust the swing amplitude.

[0006] In a first aspect, the present application provides a magnetic levitation motor control circuit, including:

[0007] A motor driving module, connected to the magnetic levitation motor, for driving the magnetic levitation motor to switch between a first operating mode and a second operating mode based on a control signal;

[0008] A voltage acquisition module, connected to the magnetic levitation motor, for acquiring a voltage signal across the magnetic levitation motor;

[0009] A control module, connected to the motor driving module and the voltage acquisition module, for generating a control signal based on the voltage signal;

[0010] Wherein, in the first operating mode and the second operating mode, the rotation direction of the magnetic levitation motor is opposite.

[0011] In one embodiment, the motor driving module includes: a switching element Q1, a switching element Q2, a switching element Q3, and a switching element Q4;

[0012] A first end of the switching element Q1 is connected to the control module through a port H1, a second end is connected to a first power supply, and a third end is connected to a first end of the magnetic levitation motor;

[0013] The first end of the switching element Q2 is connected to the control module through the port L1, the second end is grounded, and the third end is connected to the first end of the magnetic levitation motor;

[0014] The first end of the switching element Q3 is connected to the control module through the port H2, the second end is connected to the first power supply, and the third end is connected to the second end of the magnetic levitation motor;

[0015] The first end of the switching element Q4 is connected to the control module through the port L2, the second end is grounded, and the third end is connected to the second end of the magnetic levitation motor.

[0016] In one embodiment, a resistor R1 is connected between the first end of the switching element Q1 and the first power supply; the first end of the switching element Q2 is grounded through the resistor R2; a resistor R3 is connected between the first end of the switching element Q3 and the first power supply; the first end of the switching element Q4 is grounded through the resistor R4.

[0017] In one embodiment, the voltage acquisition module includes: a phase acquisition unit, and the phase acquisition unit includes:

[0018] A resistor R5, the first end of the resistor R5 is connected to the first end of the magnetic levitation motor and is connected to the control module through the port P1; the second end of the resistor R5 is connected to the second end of the magnetic levitation motor and is connected to the control module through the port P2.

[0019] In one embodiment, the voltage acquisition module further includes: an amplitude acquisition unit, and the amplitude acquisition unit includes:

[0020] A resistor R6, the first end of the resistor R6 is connected to the first end of the magnetic levitation motor, the second end of the resistor R6 is connected to the control module through the port P3 and is grounded through the capacitor C1;

[0021] A resistor R7, the first end of the resistor R7 is connected to the second end of the magnetic levitation motor, the second end of the resistor R7 is connected to the control module through the port P4 and is grounded through the capacitor C2.

[0022] In one embodiment, it further includes: a power switch module, and the power switch module includes:

[0023] A switch S1, the first end of the switch S1 is connected to the second power supply and is connected to the control module through the port KEY1; the second end of the switch S1 is grounded.

[0024] In one embodiment, the power switch module further includes:

[0025] A thermistor RT1, the first end of the thermistor RT1 is connected to the second power supply, the second end of the thermistor RT1 is connected to the first end of the resistor R8; the second end of the resistor R8 is connected to the first end of the switch S1;

[0026] Capacitor C3, the first end of capacitor C3 is connected to the second end of thermistor RT1, and the second end of capacitor C3 is grounded.

[0027] In one embodiment, the motor drive module further includes: an overcurrent protection unit, the first end of the overcurrent protection unit is respectively connected to the second end of switch element Q2 and the second end of switch element Q4, and the second end of the overcurrent protection unit is connected to the control module through port L1.

[0028] In a second aspect, a control method is provided, which is applied to the magnetic levitation motor control circuit in the first aspect. The method includes:

[0029] Obtain a first voltage signal and a second voltage signal across the magnetic levitation motor by using a voltage acquisition module;

[0030] Use the control module to compare and process the first voltage signal and the second voltage signal to obtain a control signal;

[0031] Use the motor drive module and the control signal to drive the magnetic levitation motor to switch between a first operating mode and a second operating mode;

[0032] Wherein, in the first operating mode and the second operating mode, the rotation direction of the magnetic levitation motor is opposite.

[0033] In a third aspect, an electric shaver is provided, which includes the magnetic levitation motor control circuit in the first aspect and a magnetic levitation motor.

[0034] The above magnetic levitation motor control circuit, control method and electric shaver. The magnetic levitation motor control circuit in one aspect generates a control signal based on the voltage signals across the magnetic levitation motor, and controls the magnetic levitation motor to switch between a first operating mode and a second operating mode, thereby realizing automatic adjustment of the swing amplitude of the shaver cutter head. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 It is a schematic structural diagram of a magnetic levitation motor control circuit according to an embodiment;

[0037] Figure 2 It is a circuit diagram of a motor drive module in an embodiment;

[0038] Figure 3 The circuit diagram of the voltage acquisition module in an embodiment;

[0039] Figure 4 The circuit diagram of the power switch module in an embodiment;

[0040] Description of the reference numerals in the drawings:

[0041] 100, motor drive module; 110, overcurrent protection unit; 200, maglev motor; 300, voltage acquisition module; 310, phase acquisition unit; 320, amplitude acquisition unit; 400, control module; 500, power switch module. Detailed implementation manners

[0042] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0044] It can be understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, the first resistor may be referred to as the second resistor, and similarly, the second resistor may be referred to as the first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0045] It can be understood that the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is an electrical signal or data transfer between the connected circuits, modules, units, etc.

[0046] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "comprise / include" or "have" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0047] Figure 1Schematic diagram of the control circuit of the magnetic levitation motor 200 according to an embodiment. As Figure 1 shown, the control circuit of the magnetic levitation motor 200 according to an embodiment includes: a motor driving module 100, connected to the magnetic levitation motor 200, for driving the magnetic levitation motor 200 to switch between a first operating mode and a second operating mode based on a control signal; a voltage acquisition module 300, connected to the magnetic levitation motor 200, for acquiring the voltage signal across the magnetic levitation motor 200; a control module 400, connected to the motor driving module 100 and the voltage acquisition module 300, for generating a control signal based on the voltage signal; wherein, in the first operating mode and the second operating mode, the rotation direction of the magnetic levitation motor 200 is opposite.

[0048] Wherein, the first end of the voltage acquisition module 300 is connected to the first end of the magnetic levitation motor 200 to acquire the first voltage V1 at the first end of the magnetic levitation motor 200, and the second end is connected to the second end of the magnetic levitation motor 200 to acquire the second voltage V2 at the second end of the magnetic levitation motor 200. The control module 400 determines the voltage difference between the first voltage V1 and the second voltage V2 based on the first voltage V1 and the second voltage V2, and then obtains a control signal according to the voltage difference, and sends the control signal to the motor driving module 100. The motor driving module 100 determines the operating mode of the magnetic levitation motor 200 according to the control signal.

[0049] Wherein, in the first operating mode, the magnetic levitation motor 200 can be in a forward rotation state, that is, the motor rotates from left to right, and in the second operating mode, the magnetic levitation motor 200 can be in a reverse rotation state, that is, the motor rotates from right to left. It can be understood that if the time interval between forward rotation and reverse rotation is small, the stroke of the reciprocating movement of the razor blade head connected to the magnetic levitation motor 200 is short and the swing amplitude is small; if the time interval between forward rotation and reverse rotation is large, the swing stroke of the blade head is lengthened and the swing amplitude is increased.

[0050] Exemplarily, for thick and relatively hard beards, the resistance of the blade head increases, and the load of the magnetic levitation motor 200 rises, causing the phase and amplitude of the voltage signal across the magnetic levitation motor 200 to change during operation. The electric shaver requires stronger power to ensure that the blade can fully cut the hair. In this case, the control signal generated according to the voltage signals across both ends can increase the voltage across the coil of the magnetic levitation motor 200 by increasing the duty cycle or increasing the phase difference across the magnetic levitation motor 200, thereby increasing the current, making the magnetic levitation motor 200 generate a stronger driving force, increasing the swing amplitude of the magnetic levitation motor 200, enabling the blade to cover a larger shaving area, and at the same time increasing the impact force on the beard to improve the shaving effect.

[0051] Exemplarily, for fewer, softer, or shorter beards, an overly large swing amplitude may instead cause unnecessary irritation, resulting in discomfort during shaving and even potentially causing skin redness or sensitivity. In such a case, the control signal can reduce the motor current and the swing amplitude of the magnetic levitation motor 200 by reducing the duty cycle or the phase difference across the magnetic levitation motor 200, so as to reduce the impact force of the blade and provide a more gentle shaving experience.

[0052] The control circuit for the magnetic levitation motor 200 provided in this embodiment generates a control signal based on the voltage signal across the magnetic levitation motor 200, and controls the magnetic levitation motor 200 to switch between a first operating mode and a second operating mode, thereby automatically adjusting the swing amplitude of the razor blade head.

[0053] Figure 2 Shows the circuit diagram of the motor drive module 100 in an embodiment of the present application. Refer to Figure 2 , the motor drive module 100 in the control circuit for the magnetic levitation motor 200 provided in an embodiment of the present application includes: a switching element Q1, a switching element Q2, a switching element Q3, and a switching element Q4; the first end of the switching element Q1 is connected to the control module 400 through the port H1, the second end is connected to the first power supply, and the third end is connected to the first end of the magnetic levitation motor 200; the first end of the switching element Q2 is connected to the control module 400 through the port L1, the second end is grounded, and the third end is connected to the first end of the magnetic levitation motor 200; the first end of the switching element Q3 is connected to the control module 400 through the port H2, the second end is connected to the first power supply, and the third end is connected to the second end of the magnetic levitation motor 200; the first end of the switching element Q4 is connected to the control module 400 through the port L2, the second end is grounded, and the third end is connected to the second end of the magnetic levitation motor 200.

[0054] Optionally, the switching element Q1, the switching element Q2, the switching element Q3, and the switching element Q4 can be MOSFETs (Metal-Oxide-Semiconductor), IGBTs (Insulated-Gate Bipolar Transistors), or BJTs (Bipolar Junction Transistors).

[0055] Exemplarily, the switching element Q1, the switching element Q2, the switching element Q3, and the switching element Q4 are all MOSFETs. The first ends of the switching element Q1, the switching element Q2, the switching element Q3, and the switching element Q4 are all gates, the second ends are all sources, and the third ends are all drains.

[0056] Among them, the control signals include a first control signal for port H1, a second control signal for port L1, a third control signal for port H2, and a fourth control signal for port L2. In the first operating mode, the first control signal is at a low voltage, the fourth control signal is at a high voltage, the switching elements Q1 and Q4 are turned on, the first end of the magnetic levitation motor 200 is connected to the first power supply, the second end is grounded, and the magnetic levitation motor 200 rotates from left to right. In the second operating mode, the first control signal and the second control signal are at a high voltage, the third control signal and the fourth control signal are at a low voltage, the switching elements Q1 and Q4 are turned off, the switching elements Q2 and Q3 are turned on, the second end of the magnetic levitation motor 200 is connected to the first power supply, the first end is grounded, and the magnetic levitation motor 200 rotates from right to left.

[0057] In a possible implementation, a resistor R1 is connected between the first end of the switching element Q1 and the first power supply; the first end of the switching element Q2 is grounded through a resistor R2; a resistor R3 is connected between the first end of the switching element Q3 and the first power supply; the first end of the switching element Q4 is grounded through a resistor R4.

[0058] Among them, the resistors R1-R4 are used to ensure that the switching elements Q1-Q4 are in a determined state without control signals to prevent floating. Specifically, when the control signal is not activated, the resistor R1 pulls up the first end of the switching element Q1, that is, the gate, to a high potential, the resistor R3 pulls up the gate of the switching element Q3 to a high potential, while the resistors R2 and R4 pull down the switching elements Q2 and Q4 to a low potential respectively, preventing the motor drive module 100 from being accidentally turned on, thereby avoiding misoperation of the magnetic levitation motor 200.

[0059] In a possible implementation, the resistance values of the resistors R1, R2, R3, and R4 are all 10 kΩ.

[0060] In this embodiment, the motor drive module 100 controls the operating mode of the magnetic levitation motor 200 by using the switching elements and the control signals generated by the control module 400, and can simply and flexibly adjust the vibration direction of the magnetic levitation motor 200, enabling the cutter head to swing bidirectionally and enhancing the shaving effect.

[0061] Figure 3 The circuit diagram of the voltage acquisition module 300 in an embodiment of the present application is shown. Refer to Figure 3 , in an embodiment, the provided voltage acquisition module 300 includes: a phase acquisition unit 310, and the phase acquisition unit 310 includes: a resistor R5, the first end of the resistor R5 is connected to the first end of the magnetic levitation motor 200 and is connected to the control module 400 through port P1; the second end of the resistor R5 is connected to the second end of the magnetic levitation motor 200 and is connected to the control module 400 through port P2.

[0062] Among them, the first voltage V1 of the magnetic levitation motor 200 passes through the phase acquisition unit 310 to obtain the first phase detection voltage V1'; the second voltage V2 passes through the phase acquisition unit 310 to obtain the second phase detection voltage V2'; the control module 400 monitors the first phase detection voltage V1' from the port P1 and monitors the second phase detection voltage V2' from the port P2, so as to determine the voltage phase difference across the magnetic levitation motor 200.

[0063] Optionally, the first end of the magnetic levitation motor 200 is connected to the first end of the resistor R5 through the resistor R9; the second end of the magnetic levitation motor 200 is connected to the second end of the resistor R5 through the resistor R10.

[0064] Optionally, the resistance values of the resistor R5, the resistor R9, and the resistor R10 are all 10 kΩ.

[0065] Continue to refer to Figure 3 In an embodiment of the present application, the voltage acquisition module 300 further includes: an amplitude acquisition unit 320, and the amplitude acquisition unit 320 includes: a resistor R6, the first end of the resistor R6 is connected to the first end of the magnetic levitation motor 200, the second end of the resistor R6 is connected to the control module 400 through the port P3, and is grounded through the capacitor C1; a resistor R7, the first end of the resistor R7 is connected to the second end of the magnetic levitation motor 200, the second end of the resistor R7 is connected to the control module 400 through the port P4, and is grounded through the capacitor C2.

[0066] Among them, the first voltage V1 of the magnetic levitation motor 200 passes through the amplitude acquisition unit 320 to obtain the first amplitude detection voltage V1''; the second voltage V2 passes through the amplitude acquisition unit 320 to obtain the second amplitude detection voltage V2''; the control module 400 monitors the first amplitude detection voltage V1'' from the port P3 and monitors the second amplitude detection voltage V2'' from the port P4, so as to determine the voltage amplitude difference across the magnetic levitation motor 200.

[0067] Optionally, the resistance values of the resistor R6 and the resistor R7 can be 4.7 kΩ, and the capacitance values of the capacitor C1 and the capacitor C2 can be 0.1 μF. The resistor R6, the resistor R7, the capacitor C1, and the capacitor C2 in the amplitude acquisition unit 320 form an RC filter, which can effectively filter out high-frequency noise and make the acquired amplitude detection voltage stable and reliable.

[0068] In this embodiment, the phase acquisition unit 310 and the amplitude acquisition unit 320 are used to monitor the operating state of the magnetic levitation motor 200 in real time, reduce the complexity of the circuit, improve the accuracy of the detection voltage, and can effectively improve the control precision and control efficiency of the control circuit of the magnetic levitation motor 200.

[0069] Figure 4The circuit diagram of the power switch module 500 in an embodiment of the present application is shown. Refer to Figure 4 In a control circuit of the magnetic levitation motor 200 provided in an embodiment of the present application, a power switch module 500 is further included. The power switch module 500 includes: a switch S1, a first end of the switch S1 is connected to a second power supply and is connected to the control module 400 through a port KEY1; a second end of the switch S1 is grounded.

[0070] Wherein, the power switch module 500 is used to provide a key status signal to the control module 400 for responding to user operations. When the switch S1 is turned off, the port KEY1 is connected to the second power supply and is at a high level; when the switch S1 is closed, the port KEY1 is grounded. It can be understood that the control module 400 can determine user operations according to the detected level of the port KEY1, and then execute corresponding control logics, such as starting to generate control signals or stopping generating control signals.

[0071] In a possible implementation manner, the power switch module 500 further includes: a thermistor RT1, a first end of the thermistor RT1 is connected to the second power supply, and a second end of the thermistor RT1 is connected to a first end of a resistor R8; a second end of the resistor R8 is connected to the first end of the switch S1; a capacitor C3, a first end of the capacitor C3 is connected to the second end of the thermistor RT1, and a second end of the capacitor C3 is grounded.

[0072] Wherein, the second end of the thermistor RT1 is connected to the control module 400 through a port TEMP. The thermistor RT1 is a negative temperature coefficient thermistor. When the temperature rises, the resistance value of the thermistor RT1 will decrease, and the voltage of the interface TEMP also changes accordingly. The control module 400 can calculate the temperature value according to the voltage sent by the port TEMP to realize the function of measuring temperature.

[0073] The power switch module 500 in this embodiment realizes user operation response through the switch S1 and realizes real-time temperature monitoring through the thermistor RT1. In this way, the control module 400 can generate corresponding control signals when the temperature of the control circuit of the magnetic levitation motor 200 exceeds a preset safety threshold, control the magnetic levitation motor 200 to stop running, or control the control circuit of the magnetic levitation motor 200 to be open-circuited, so as to avoid damage to the components in the control circuit of the magnetic levitation motor 200 caused by excessive temperature.

[0074] Continue to refer to Figure 2 In a possible implementation manner, the motor drive module 100 further includes: an overcurrent protection unit 110, a first end of the overcurrent protection unit 110 is respectively connected to a second end of a switching element Q2 and a second end of a switching element Q4, and a second end of the overcurrent protection unit 110 is connected to the control module 400 through a port L1.

[0075] Among them, the overcurrent protection unit 110 includes: resistor R11, resistor R12, resistor R13 and capacitor C4. The first end of resistor R11 is connected to the source electrodes of switching element Q2 and switching element Q4, and the second end is grounded; resistor R12 is connected in parallel with resistor R11. The first end of resistor R13 is connected to the first end of resistor R11, and the second end is connected to the first end of capacitor C4. The second end of capacitor C4 is grounded; the second end of resistor R13 is also connected to the control module 400 through port I_LODE.

[0076] The resistance values of resistor R11, resistor R12 and resistor R13 in the overcurrent protection unit 110 are relatively small, which can be 0.1Ω to 1Ω, so as to minimize the impact on the entire circuit while maintaining a sufficient signal level for detection. Capacitor C4 is used to perform low-pass filtering on the detection signal to remove high-frequency noise and ensure that the signal transmitted to the control module 400 is more stable. The control module 400 reads the voltage signal at the second end of resistor R13 through port I_LODE and calculates the actual current flowing through the magnetic levitation motor 200 according to the preset shunt resistance value. If the current is too large, for example, exceeding the safety threshold, the control module 400 can take corresponding protection measures, such as adjusting the control signal or controlling the magnetic levitation motor 200 control circuit to open.

[0077] Optionally, the control module 400 can generate circuit protection measures based on the signals transmitted back through port I_LODE and port TEMP, thereby ensuring the safety of the magnetic levitation motor 200 control circuit.

[0078] Refer to Figures 1 to 4 , in an exemplary embodiment, a control circuit for a magnetic levitation motor 200 is provided, including: a motor drive module 100, connected to the magnetic levitation motor 200, for driving the magnetic levitation motor 200 to switch between a first operating mode and a second operating mode based on a control signal; a voltage acquisition module 300, connected to the magnetic levitation motor 200, for acquiring the voltage signal across the magnetic levitation motor 200; a control module 400, connected to the motor drive module 100 and the voltage acquisition module 300, for generating a control signal based on the voltage signal; a power switch module 500. Among them, in the first operating mode and the second operating mode, the rotation direction of the magnetic levitation motor 200 is opposite.

[0079] Among them, the motor drive module 100 includes: a switching element Q1, a switching element Q2, a switching element Q3, and a switching element Q4; the first end of the switching element Q1 is connected to the control module 400 through the port H1, the second end is connected to the first power supply, and the third end is connected to the first end of the magnetic levitation motor 200; the first end of the switching element Q2 is connected to the control module 400 through the port L1, the second end is grounded, and the third end is connected to the first end of the magnetic levitation motor 200; the first end of the switching element Q3 is connected to the control module 400 through the port H2, the second end is connected to the first power supply, and the third end is connected to the second end of the magnetic levitation motor 200; the first end of the switching element Q4 is connected to the control module 400 through the port L2, the second end is grounded, and the third end is connected to the second end of the magnetic levitation motor 200. A resistor R1 is connected between the first end of the switching element Q1 and the first power supply; the first end of the switching element Q2 is grounded through a resistor R2; a resistor R3 is connected between the first end of the switching element Q3 and the first power supply; the first end of the switching element Q4 is grounded through a resistor R4. An overcurrent protection unit 110, the first end of the overcurrent protection unit 110 is respectively connected to the second ends of the switching element Q2 and the switching element Q4, and the second end of the overcurrent protection unit 110 is connected to the control module 400 through the port L1.

[0080] The voltage acquisition module 300 includes: a phase acquisition unit 310, and the phase acquisition unit 310 includes: a resistor R5, the first end of the resistor R5 is connected to the first end of the magnetic levitation motor 200 and is connected to the control module 400 through the port P1; the second end of the resistor R5 is connected to the second end of the magnetic levitation motor 200 and is connected to the control module 400 through the port P2. The voltage acquisition module 300 further includes: an amplitude acquisition unit 320, and the amplitude acquisition unit 320 includes: a resistor R6, the first end of the resistor R6 is connected to the first end of the magnetic levitation motor 200, the second end of the resistor R6 is connected to the control module 400 through the port P3 and is grounded through a capacitor C1; a resistor R7, the first end of the resistor R7 is connected to the second end of the magnetic levitation motor 200, the second end of the resistor R7 is connected to the control module 400 through the port P4 and is grounded through a capacitor C2.

[0081] The power switch module 500 includes: a switch S1, the first end of the switch S1 is connected to the second power supply and is connected to the control module 400 through the port KEY1; the second end of the switch S1 is grounded. A thermistor RT1, the first end of the thermistor RT1 is connected to the second power supply, the second end of the thermistor RT1 is connected to the first end of a resistor R8; the second end of the resistor R8 is connected to the first end of the switch S1; a capacitor C3, the first end of the capacitor C3 is connected to the second end of the thermistor RT1, and the second end of the capacitor C3 is grounded.

[0082] In an exemplary embodiment, a control method is provided, which is applied to the control circuit of the magnetic levitation motor 200 provided in the foregoing embodiment. The method includes:

[0083] S1. Use the voltage acquisition module 300 to obtain a first voltage signal and a second voltage signal across the magnetic levitation motor 200;

[0084] S2. Use the control module 400 to compare and process the first voltage signal and the second voltage signal to obtain a control signal;

[0085] S3. Use the motor drive module 100 and the control signal to drive the magnetic levitation motor 200 to switch between a first operating mode and a second operating mode; wherein, in the first operating mode and the second operating mode, the rotation direction of the magnetic levitation motor 200 is opposite.

[0086] In an exemplary embodiment, an electric shaver is provided, which includes the magnetic levitation motor control circuit provided in the foregoing embodiment and a magnetic levitation motor.

[0087] In the description of this specification, the descriptions with reference to terms such as "some embodiments", "other embodiments", "ideal embodiments", etc. mean that the specific features, structures, materials or features described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0088] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0089] The above embodiments only represent several implementation manners of the present invention. The descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A magnetic levitation motor control circuit, characterized in that: include: A motor driving module, connected to the magnetic levitation motor, and configured to drive the magnetic levitation motor to switch between a first operation mode and a second operation mode based on a control signal; A voltage acquisition module, connected to the magnetic levitation motor, for acquiring voltage signals at both ends of the magnetic levitation motor; A control module, connected to the motor drive module and the voltage acquisition module, and configured to generate the control signal based on the voltage signal; Wherein, in the first operating mode and the second operating mode, the rotation direction of the magnetic levitation motor is opposite.

2. The magnetic levitation motor control circuit according to claim 1, characterized in that: The motor driving module includes: a switching element Q1, a switching element Q2, a switching element Q3 and a switching element Q4; The first end of the switch element Q1 is connected to the control module through the port H1, the second end is connected to the first power supply, and the third end is connected to the first end of the magnetic suspension motor; The first end of the switch element Q2 is connected to the control module through the port L1, the second end is grounded, and the third end is connected to the first end of the magnetic suspension motor; The first end of the switch element Q3 is connected to the control module through the port H2, the second end is connected to the first power supply, and the third end is connected to the second end of the magnetic suspension motor; The first end of the switch element Q4 is connected to the control module through the port L2, the second end is grounded, and the third end is connected to the second end of the magnetic levitation motor.

3. The magnetic levitation motor control circuit according to claim 2, characterized in that: A resistor R1 is connected between the first end of the switch element Q1 and the first power supply; a first end of the switch element Q2 is grounded through the resistor R2; a resistor R3 is connected between the first end of the switch element Q3 and the first power supply; and a first end of the switch element Q4 is grounded through the resistor R4.

4. The magnetic levitation motor control circuit according to claim 1, characterized in that: The voltage acquisition module includes: a phase acquisition unit, and the phase acquisition unit includes: Resistor R5, a first end of the resistor R5 is connected to a first end of the magnetic levitation motor, and is connected to the control module through port P1; a second end of the resistor R5 is connected to a second end of the magnetic levitation motor, and is connected to the control module through port P2.

5. The magnetic levitation motor control circuit according to claim 4, characterized in that: The voltage acquisition module further includes: an amplitude acquisition unit, and the amplitude acquisition unit includes: A resistor R6, wherein a first end of the resistor R6 is connected to a first end of the magnetic levitation motor, a second end of the resistor R6 is connected to the control module through a port P3, and is grounded through a capacitor C1; A resistor R7, wherein a first end of the resistor R7 is connected to a second end of the magnetic levitation motor, and a second end of the resistor R7 is connected to the control module through a port P4 and is grounded through a capacitor C2.

6. The magnetic levitation motor control circuit according to claim 1, characterized in that: Also includes: A power switch module, the power switch module comprising: A switch S1, a first end of the switch S1 is connected to a second power source, and is connected to the control module through a port KEY1; A second terminal of the switch S1 is grounded.

7. The magnetic levitation motor control circuit according to claim 6, characterized in that: The power switch module also includes: a thermistor RT1, wherein a first end of the thermistor RT1 is connected to the second power supply, a second end of the thermistor RT1 is connected to a first end of a resistor R8; and a second end of the resistor R8 is connected to a first end of the switch S1; A capacitor C3, wherein a first end of the capacitor C3 is connected to a second end of the thermistor RT1, and a second end of the capacitor C3 is grounded.

8. The magnetic levitation motor control circuit according to claim 2, characterized in that: The motor driving module further includes: an overcurrent protection unit, a first end of which is connected to the second end of the switch element Q2 and the second end of the switch element Q4 respectively, and a second end of the overcurrent protection unit is connected to the control module through a port L1.

9. A control method, characterized in that: The magnetic levitation motor control circuit applied to any one of claims 1 to 8, the method comprising: Using a voltage acquisition module to acquire a first voltage signal and a second voltage signal at both ends of the magnetic levitation motor; Using a control module to compare and process the first voltage signal and the second voltage signal to obtain a control signal; Using the motor drive module and the control signal, driving the magnetic suspension motor to switch between a first operating mode and a second operating mode; Wherein, in the first operating mode and the second operating mode, the rotation direction of the magnetic levitation motor is opposite.

10. An electric shaver, characterized in that: The invention comprises a magnetic levitation motor control circuit as described in any one of claims 1 to 8, and a magnetic levitation motor.

Images