DC motor drive devices and electrical equipment

Abstract

This application relates to the field of motor drives and discloses a drive device and electrical equipment for a DC motor. The drive device for the DC motor includes a signal processing module, a Class D power amplifier module, and an anti-interference module. The signal processing module includes a signal coupling unit and a DC bias unit. The DC bias unit is used to connect to the supply voltage and output a reference signal by voltage division. The signal coupling unit is used to couple the drive signal with the reference signal output by the DC bias unit to output a reference signal. The Class D power amplifier module amplifies the reference signal to obtain a pulse signal, and the pulse signal is filtered by the anti-interference module before being output to the DC motor. This application's embodiment utilizes the low power consumption of the Class D power amplifier module to reduce drive power consumption, and through the synergistic effect of the signal processing module, the Class D power amplifier module, and the anti-interference module, improves the drive efficiency of the DC motor and suppresses high-frequency noise.

Description

Technical Field

[0001] This application relates to the field of DC motor drives, and more particularly to a DC motor drive device and electrical equipment. Background Technology

[0002] like Figure 1 As shown, the existing motor drive circuit is an H-bridge drive circuit, which typically operates at a frequency of around 20kHz. H-bridge drive circuits are currently widely used, primarily controlling the forward and reverse rotation of the motor by controlling the on / off state of four MOSFETs (Q1, Q2, Q3, Q4). However, when applied to high-speed DC motors, the H-bridge drive circuit exhibits relatively high power consumption, resulting in low drive efficiency for the DC motor. Summary of the Invention

[0003] In view of this, in order to overcome the shortcomings of the prior art, this application provides a drive device and electrical equipment for a DC motor.

[0004] In a first aspect, this application provides a DC motor drive device, including a signal processing module, a Class D power amplifier module, and an anti-interference module;

[0005] The signal processing module includes a signal coupling unit and a DC bias unit; the DC bias unit is used to connect to the power supply voltage and output a reference signal by voltage division; the signal coupling unit is used to couple the drive signal with the reference signal output by the DC bias unit to output a reference signal.

[0006] The Class D power amplifier module is used to amplify the reference signal to obtain a pulse signal, and then outputs the pulse signal to the DC motor after filtering by the anti-interference module.

[0007] In an optional implementation, the anti-interference module includes a common-mode noise suppression unit and an absorption unit;

[0008] The common-mode noise suppression unit includes a common-mode filter inductor and first to fourth capacitors;

[0009] The absorption unit includes a fifth capacitor, a sixth capacitor, a first resistor, and a second resistor;

[0010] The first and second pins of the common-mode filter inductor are grounded through the first and second capacitors, respectively, and are both connected to the output terminal of the Class D power amplifier module.

[0011] The third and fourth pins of the common-mode filter inductor are grounded through the third and fourth capacitors, respectively. The third pin of the common-mode filter inductor is also grounded through the first resistor and the fifth capacitor connected in series. The fourth pin of the common-mode filter inductor is also grounded through the second resistor and the sixth capacitor connected in series.

[0012] In an optional implementation, the signal coupling unit includes a proportional operational amplifier and third to sixth resistors;

[0013] The inverting input terminal of the proportional operational amplifier is grounded through a third resistor;

[0014] The non-inverting input terminal of the proportional operational amplifier is connected to the reference signal through a fourth resistor and grounded through a fifth resistor;

[0015] The sixth resistor is connected in parallel between the inverting input and the output of the proportional operational amplifier.

[0016] In an optional implementation, the signal processing module further includes a filtering unit;

[0017] The filtering unit includes a seventh resistor, a seventh capacitor, and an eighth capacitor;

[0018] One end of the seventh resistor is connected to the seventh capacitor and the fifth resistor respectively, and the other end of the seventh resistor is used to input the driving signal;

[0019] One end of the eighth capacitor is connected to the fourth resistor and the non-inverting input of the proportional operational amplifier, and the other end of the eighth capacitor is grounded.

[0020] In an optional implementation, the signal processing module further includes a protection unit for limiting the potential difference of the input signal of the Class D power amplifier module;

[0021] The protection unit includes an eighth resistor, a ninth resistor, a first diode, and a second diode;

[0022] The first parallel terminal of the first diode and the second diode is connected to the output terminal of the signal coupling unit through the eighth resistor, and is also connected to the input terminal of the Class D power amplifier module;

[0023] The second parallel terminal of the first diode and the second diode is grounded through the ninth resistor and connected to the input terminal of the Class D power amplifier module.

[0024] In an optional implementation, the DC bias unit includes a connected voltage divider subunit, a voltage follower subunit, and a filter subunit;

[0025] The voltage divider subunit is used to divide the input power supply voltage to obtain a voltage divider signal. The target value of the voltage divider corresponds to the DC bias value of the Class D power amplifier module.

[0026] The voltage follower subunit is used to amplify the voltage divider signal to obtain a follower signal, and the follower signal is filtered by the filter subunit to obtain a reference signal.

[0027] In an optional implementation, the voltage follower subunit is a voltage follower;

[0028] The positive terminal of the voltage follower is grounded through the ninth capacitor.

[0029] In an optional implementation, the voltage divider subunit includes a tenth resistor and an eleventh resistor connected in series; the tenth resistor is used to connect to the supply voltage, and the eleventh resistor is used to ground; the intermediate node of the tenth resistor and the eleventh resistor is connected to the input terminal of the voltage follower subunit.

[0030] The filter subunit includes a tenth capacitor and an eleventh capacitor connected in parallel; the first parallel terminal of the tenth capacitor and the eleventh capacitor is connected to the output terminal of the voltage follower subunit, and the second parallel terminal of the tenth capacitor and the eleventh capacitor is grounded.

[0031] In an optional implementation, the Class D power amplifier module includes a signal gain submodule, a Class D modulator, and a bootstrap circuit.

[0032] The signal gain submodule is used to increase the signal gain of the reference signal and output it to the Class D modulator;

[0033] The Class D modulator is used to pulse modulate the reference signal after the signal gain has been increased to obtain a pulse signal, which is then output to the bootstrap circuit.

[0034] The bootstrap circuit is used to increase the voltage of the pulse signal and output it to the anti-interference module.

[0035] Secondly, this application provides an electrical device including a DC motor and a drive device for the DC motor as described above.

[0036] The embodiments of this application have the following beneficial effects:

[0037] This application provides a DC motor drive device, which includes a signal processing module, a Class D power amplifier module, and an anti-interference module. The signal processing module includes a signal coupling unit and a DC bias unit. The DC bias unit is used to receive the supply voltage and output a reference signal by voltage division. The signal coupling unit is used to input the drive signal and couple the drive signal with the reference signal output by the DC bias unit to output a reference signal. The Class D power amplifier module is used to convert the reference signal into a pulse signal, and the pulse signal is filtered by the anti-interference module before being output to the DC motor. This application reduces drive power consumption by utilizing the low power consumption of the integrated Class D power amplifier module, and improves the drive efficiency of the DC motor and suppresses high-frequency noise during high-speed operation of the DC motor through the synergistic effect of the signal processing module, the Class D power amplifier module, and the anti-interference module. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be considered as a limitation on the scope of protection of this application. In the various drawings, similar components are numbered similarly.

[0039] Figure 1 A schematic diagram of the structure of the H-bridge-based motor drive device in an embodiment of this application is shown;

[0040] Figure 2 A schematic diagram of a speaker driver based on a Class D amplifier is shown.

[0041] Figure 3 A schematic diagram of a first structure of a DC motor drive device according to an embodiment of this application is shown;

[0042] Figure 4 A schematic diagram of a second structure of a DC motor drive device is shown in an embodiment of this application;

[0043] Figure 5 A schematic diagram of the DC bias unit in an embodiment of this application is shown;

[0044] Figure 6 A schematic diagram of a third structure of a DC motor drive device is shown in an embodiment of this application.

[0045] Key component symbols: 100 - Signal processing module; 110 - Signal coupling unit; 120 - DC bias unit; 121 - Voltage divider subunit; 122 - Voltage follower subunit; 123 - Filtering subunit; 130 - Filtering unit; 140 - Noise suppression unit; 150 - Protection unit; 200 - Class D power amplifier module; 300 - Anti-interference module; 310 - Common-mode noise suppression unit; 320 - Absorption unit. Detailed Implementation

[0046] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0047] The components of the embodiments of this application described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0048] In the following, the terms “comprising,” “having,” and their cognates, which may be used in various embodiments of this application, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as excluding, firstly, the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more features, numbers, steps, operations, elements, components, or combinations thereof.

[0049] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0050] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be construed as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0051] Currently, power amplifiers are developing rapidly and come in a wide variety of types. These include Class A, Class B, Class AB, Class C, and Class D amplifiers. These amplifiers are mainly used in audio systems, such as car stereos and speakers in electronic devices. Among them, Class D amplifiers are widely used in electronic devices that incorporate audio systems due to their high efficiency.

[0052] Specifically, a Class D (digital audio power) amplifier is an audio power amplifier that converts the input analog audio signal or PCM digital information into a PWM (pulse width modulation) or PDM (pulse density modulation) pulse signal, and then uses the PWM or PDM pulse signal to control the on / off state of high-power switching devices; therefore, in the prior art, audio signals are mainly output through Class D amplifier circuits or Class D amplifiers.

[0053] For example, please refer to Figure 2In existing speaker driver devices based on Class D amplifiers, the RIN right audio channel outputs an AC audio signal to the Class D amplifier via capacitors C13 (13th) and C14 (14th). Upon receiving the audio signal, the Class D amplifier outputs it to the right channel speaker through an LC filter circuit (inductor L2 and capacitor C15, inductor L3 and capacitor C16) to control the speaker's sound output. Similarly, the LIN left audio channel outputs an AC audio signal to the Class D amplifier via capacitors C17 and C18 (17th) and C18 (18th). The Class D amplifier also outputs the signal to the right channel speaker through an LC filter circuit (inductor L4 and capacitor C19, inductor L5 and capacitor C20) to control the speaker's sound output.

[0054] It is understood that Class D amplifiers used in speaker drivers of audio systems have the characteristics of low power consumption and low noise. In this embodiment, the Class D amplifier is combined with a DC motor to suppress the large noise generated when the DC motor is running at high speed. Specifically, this embodiment uses a Class D amplifier as a power amplifier module to drive the DC motor. By leveraging the low power consumption and low noise characteristics of the Class D amplifier, the driving efficiency of the DC motor is improved, the driving power consumption is reduced, and high-frequency noise is suppressed.

[0055] Example 1

[0056] Please refer to Figures 3 to 6 This application provides a DC motor drive device for driving a DC motor. The device includes a signal processing module 100, a Class D power amplifier module 200, and an anti-interference module 300. The signal processing module 100 receives a drive signal and a supply voltage (VCC) respectively, divides the supply voltage to obtain a reference signal, and couples the drive signal and the reference signal to output a reference signal. The Class D power amplifier module 200 amplifies the reference signal to obtain a pulse signal, and the anti-interference module 300 filters the pulse signal before outputting it to the DC motor, thereby driving the DC motor to operate.

[0057] In this embodiment, driving the DC motor with a Class D power amplifier module 200 can improve the problem of loud noise from a high-speed motor. Optionally, the Class D power amplifier module 200 can be a Class D amplifier or a Class D amplifier circuit.

[0058] As an example, the Class D power amplifier module 200 includes a signal gain submodule (not shown), a Class D modulator (not shown), and a bootstrap circuit (not shown).

[0059] Furthermore, the signal gain submodule is used to increase the signal gain of the reference signal and output it to the Class D modulator; the Class D modulator is used to pulse modulate the reference signal after the signal gain is increased to obtain a pulse signal and output it to the bootstrap circuit; the bootstrap circuit is used to increase the voltage of the pulse signal and output it to the anti-interference module 300.

[0060] The Class D amplifier module 200 has a built-in MUTE function. When abnormal conditions such as overcurrent or overheating occur, the Class D amplifier module 200 will actively shut down the output through this MUTE function, thus providing abnormal protection for the DC motor. The MUTE key is a commonly used control electrical component; its function is used to control certain functions of machinery or programs, or to turn control circuits on and off, thereby controlling the operation of the DC motor or other electrical equipment.

[0061] The Class D power amplifier module 200 controls the switching of its internal transistors by receiving a reference signal, and the switching frequency can reach 1.2MHz or higher. It also has high operating efficiency. Therefore, when the Class D power amplifier module 200 is used in the DC motor drive device, power consumption can be reduced, which has certain practicality.

[0062] In one embodiment, the anti-interference module 300 includes a common-mode noise suppression unit 310 and an absorption unit 320. The common-mode noise suppression unit 310 includes a common-mode filter inductor L1 and first to fourth capacitors. The absorption unit 320 includes a fifth capacitor C11, a sixth capacitor C12, a first resistor R10, and a second resistor R11. The first and second pins of the common-mode filter inductor L1 are grounded through the first capacitor C7 and the second capacitor C8, respectively, and are both connected to the output terminal of the Class D power amplifier module 200. The third and fourth pins of the common-mode filter inductor L1 are grounded through the third capacitor C9 and the fourth capacitor C10, respectively. The third pin of the common-mode filter inductor L1 is also grounded through the first resistor R10 and the fifth capacitor C11 connected in series, and the fourth pin of the common-mode filter inductor L1 is also grounded through the second resistor R11 and the sixth capacitor C12 connected in series.

[0063] In this embodiment, considering that the DC motor is composed of inductors, a common-mode filter inductor L1 is connected to the output of the Class D power amplifier module 200, and capacitors (C7, C8, C9, C10) are used to form a common-mode noise suppression unit 310 (i.e., a common-mode filter) to eliminate electromagnetic (i.e., EMI) interference in the circuit. The absorption unit 320 is used to absorb excess energy interference. Therefore, this embodiment, through the anti-interference module 300, can achieve anti-interference of electromagnetic and other signals during the DC motor driving process, thereby improving the driving efficiency of the DC motor.

[0064] Exemplarily, the signal processing module 100 includes a signal coupling unit 110, a DC bias unit 120, a filtering unit 130, a noise suppression unit 140, and a protection unit 150. The DC bias unit 120 is used to input the supply voltage (VCC) and output a reference signal (VREF) by voltage division; the signal coupling unit 110 is used to input a drive signal and couple the drive signal with the reference signal output by the DC bias unit 120 to output a reference signal; the filtering unit 130 is used to filter the reference signal; and the protection unit 150 is used to control the voltage difference between the two input terminals of the Class D power amplifier module 200, thereby providing overvoltage protection for the components within the Class D power amplifier module 200.

[0065] In one embodiment, the DC bias unit 120 includes a voltage divider subunit 121, a voltage follower subunit 122, and a filter subunit 123 connected together. The voltage divider subunit 121 is used to divide the input supply voltage to obtain a voltage divider signal, wherein the target value of the voltage divider corresponds to the DC bias value of the Class D power amplifier module 200. The voltage follower subunit 122 is used to amplify the voltage divider signal to obtain a follower signal, and the follower signal is filtered by the filter subunit 123 to obtain a reference signal.

[0066] Exemplarily, the voltage follower subunit 122 can be a voltage follower U1; the non-inverting input of the voltage follower U1 is connected to the voltage divider subunit 121, and the inverting input of the voltage follower U1 is connected to its output; the positive terminal of the voltage follower U1 is used to connect to the supply voltage and is grounded through the ninth capacitor C4; the negative terminal of the voltage follower U1 is grounded. Optionally, the voltage follower U1 can be a non-inverting voltage follower U1. The voltage follower U1 is a common-collector circuit, with the electrical signal input from the base and output from the emitter, hence it is also called an emitter follower. The base voltage and collector voltage are in phase, that is, the input voltage and output voltage are in phase. Furthermore, this voltage follower U1 has the characteristics of high input resistance, low output resistance, and a voltage gain of approximately 1.

[0067] Voltage divider subunit 121 includes a tenth resistor R6 and an eleventh resistor R7 connected in series. The tenth resistor R6 is used to connect to the supply voltage, and the eleventh resistor R7 is used to ground. The intermediate node of the tenth resistor R6 and the eleventh resistor R7 is connected to the input terminal of the voltage follower subunit 122, and further, the intermediate node of the tenth resistor R6 and the eleventh resistor R7 is connected to the inverting input terminal of the voltage follower U1. When the voltage divider subunit 121 divides the voltage, the target amplitude of the divided voltage signal obtained after voltage division needs to be consistent with the DC bias value in the Class D power amplifier module to prevent the excessively large coupled reference signal from directly damaging the power device in the Class D power amplifier module after being connected. The purpose of voltage division is to adjust the amplitude of the output supply voltage to protect the components in the Class D power amplifier module.

[0068] The filtering subunit 123 includes a tenth capacitor C5 and an eleventh capacitor C6 connected in parallel. The first parallel connection of the tenth capacitor C5 and the eleventh capacitor C6 is connected to the output of the voltage follower subunit 122, and further, the first parallel connection of the tenth capacitor C5 and the eleventh capacitor C6 is connected to the output of the voltage follower U1. The second parallel connection of the tenth capacitor C5 and the eleventh capacitor C6 is grounded. In this embodiment, the output of the voltage follower U1 outputs a reference signal, and the output reference signal is filtered by the tenth capacitor C5 and the eleventh capacitor C6. The tenth capacitor C5 and the eleventh capacitor C6 serve as energy storage and filtering capacitors to reduce fluctuations in the output reference signal.

[0069] In one embodiment, the signal coupling unit 110 includes a proportional operational amplifier U2 and third to sixth resistors; the inverting input terminal of the proportional operational amplifier U2 is grounded through the third resistor R1; the non-inverting input terminal of the proportional operational amplifier U2 is connected to a reference signal through the fourth resistor R2 and grounded through the fifth resistor R3; the sixth resistor R4 is connected in parallel between the inverting input terminal and the output terminal of the proportional operational amplifier U2.

[0070] Specifically, the non-inverting input of the proportional operational amplifier U2 is connected to the reference signal through the fourth resistor R2 and grounded through the fifth resistor R3; the inverting input of the proportional operational amplifier U2 is grounded through the third resistor R1, and the sixth resistor R4 is connected in parallel between the inverting input and the output of the proportional operational amplifier U2. The reference signal output from the output of the voltage follower U1 is filtered by the tenth capacitor C5 and the eleventh capacitor C6, and then input to the signal coupling unit 110 through the fourth resistor R2.

[0071] It is understood that the signal coupling unit 110 controls the output amplitude of the reference signal by controlling the resistance value of each resistor in the control unit, so as to control the amplitude of the reference signal input to the Class D power amplifier module 200 to about 1V, to prevent the reference signal amplitude from being too large and damaging the internal components, so as to protect the components in the circuit.

[0072] In one embodiment, the filter unit 130 includes a seventh resistor R5, a seventh capacitor C1, and an eighth capacitor C2; one end of the seventh resistor R5 is connected to the seventh capacitor C1 and the fifth resistor R3, and the other end of the seventh resistor R5 is used to input a drive signal; one end of the eighth capacitor C2 is connected to the fourth resistor R2 and the non-inverting input terminal of the proportional operational amplifier U2, and the other end of the eighth capacitor C2 is grounded. The filter unit 130 is used to perform active filtering on various signals in the circuit.

[0073] In one embodiment, the noise suppression unit 140 includes a twelfth capacitor C3; the twelfth capacitor C3 is connected in parallel between the inverting input terminal and the output terminal of the proportional operational amplifier U2, that is, the twelfth capacitor C3 is connected in parallel across the six resistor R4, for suppressing high-frequency noise and oscillation in the circuit.

[0074] As an optional implementation, the protection unit 150 includes an eighth resistor R8, a ninth resistor R9, a first diode D1, and a second diode D2. The first parallel terminal of the first diode D1 and the second diode D2 is connected to the output terminal of the signal coupling unit 110 through the eighth resistor R8, and is also connected to the input terminal of the Class D power amplifier module 200. The second parallel terminal of the first diode D1 and the second diode D2 is grounded through the ninth resistor R9, and is also connected to the input terminal of the Class D power amplifier module 200. Therefore, the protection unit 150 can be used to limit the potential difference of the input signal of the Class D power amplifier module 200.

[0075] This embodiment of the application reduces drive power consumption by leveraging the low power consumption characteristic of the integrated Class D power amplifier module. Through the synergistic action of the signal processing module, the Class D power amplifier module, and the anti-interference module, the signal processing module 100 processes the reference signal input to the Class D power amplifier module 200 to protect the components in the Class D power amplifier module 200 from damage. The anti-interference module 300 filters out electromagnetic interference and other energy interference in the circuit, thereby improving the drive efficiency of the DC motor and suppressing high-frequency noise during high-speed operation of the DC motor, demonstrating good practicality.

[0076] Example 2

[0077] Please refer to Figures 3 to 6 This application provides an electrical device, which includes a DC motor and a drive device for the DC motor in the above embodiments, wherein the drive device for the DC motor is connected to the DC motor.

[0078] It is understood that the DC motor drive device and DC motor in this embodiment correspond to the DC motor drive device and DC motor described in the above embodiments. The options in the above embodiments are also applicable to this embodiment, so they will not be described in detail here.

[0079] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A drive device for a DC motor, characterized in that, Used to drive DC motors, including signal processing module, Class D power amplifier module, and anti-interference module; The signal processing module includes a signal coupling unit and a DC bias unit; wherein, the signal coupling unit includes a proportional operational amplifier and third to sixth resistors; the inverting input terminal of the proportional operational amplifier is grounded through the third resistor; the non-inverting input terminal of the proportional operational amplifier is connected to a reference signal through a fourth resistor and grounded through a fifth resistor; the sixth resistor is connected in parallel between the inverting input terminal and the output terminal of the proportional operational amplifier; The DC bias unit is used to connect to the power supply voltage and output a reference signal by voltage division. The signal coupling unit is used to couple the drive signal with the reference signal output by the DC bias unit to output a reference signal. The Class D power amplifier module is used to amplify the reference signal to obtain a pulse signal, and then outputs the pulse signal to the DC motor after filtering by the anti-interference module.

2. The DC motor drive device according to claim 1, characterized in that, The anti-interference module includes a common-mode noise suppression unit and an absorption unit; The common-mode noise suppression unit includes a common-mode filter inductor and first to fourth capacitors; The absorption unit includes a fifth capacitor, a sixth capacitor, a first resistor, and a second resistor; The first and second pins of the common-mode filter inductor are grounded through the first and second capacitors, respectively, and are both connected to the output terminal of the Class D power amplifier module. The third and fourth pins of the common-mode filter inductor are grounded through the third and fourth capacitors, respectively. The third pin of the common-mode filter inductor is also grounded through the first resistor and the fifth capacitor connected in series. The fourth pin of the common-mode filter inductor is also grounded through the second resistor and the sixth capacitor connected in series.

3. The DC motor drive device according to claim 1, characterized in that, The signal processing module also includes a filtering unit; The filtering unit includes a seventh resistor, a seventh capacitor, and an eighth capacitor; One end of the seventh resistor is connected to the seventh capacitor and the fifth resistor respectively, and the other end of the seventh resistor is used to input the driving signal; One end of the eighth capacitor is connected to the fourth resistor and the non-inverting input of the proportional operational amplifier, and the other end of the eighth capacitor is grounded.

4. The DC motor drive device according to claim 1, characterized in that, The signal processing module also includes a protection unit, which is used to limit the potential difference of the input signal of the Class D power amplifier module; The protection unit includes an eighth resistor, a ninth resistor, a first diode, and a second diode; The first parallel terminal of the first diode and the second diode is connected to the output terminal of the signal coupling unit through the eighth resistor, and is also connected to the input terminal of the Class D power amplifier module; The second parallel terminal of the first diode and the second diode is grounded through the ninth resistor and connected to the input terminal of the Class D power amplifier module.

5. The drive device for a DC motor according to claim 1, 2, 3 or 4, characterized in that, The DC bias unit includes a connected voltage divider subunit, a voltage follower subunit, and a filter subunit; The voltage divider subunit is used to divide the input power supply voltage to obtain a voltage divider signal. The target value of the voltage divider corresponds to the DC bias value of the Class D power amplifier module. The voltage follower subunit is used to amplify the voltage divider signal to obtain a follower signal, and the follower signal is filtered by the filter subunit to obtain a reference signal.

6. The DC motor drive device according to claim 5, characterized in that, The voltage follower subunit is a voltage follower; The positive terminal of the voltage follower is grounded through the ninth capacitor.

7. The DC motor drive device according to claim 5, characterized in that, The voltage divider subunit includes a tenth resistor and an eleventh resistor connected in series; the tenth resistor is used to connect to the power supply voltage, and the eleventh resistor is used to ground; the intermediate node of the tenth resistor and the eleventh resistor is connected to the input terminal of the voltage follower subunit. The filter subunit includes a tenth capacitor and an eleventh capacitor connected in parallel; the first parallel terminal of the tenth capacitor and the eleventh capacitor is connected to the output terminal of the voltage follower subunit, and the second parallel terminal of the tenth capacitor and the eleventh capacitor is grounded.

8. The drive device for a DC motor according to claim 1, 2, 3, 4, 6 or 7, characterized in that, The Class D power amplifier module includes a signal gain submodule, a Class D modulator, and a bootstrap circuit. The signal gain submodule is used to increase the signal gain of the reference signal and output it to the Class D modulator; The Class D modulator is used to pulse modulate the reference signal after the signal gain has been increased to obtain a pulse signal, which is then output to the bootstrap circuit. The bootstrap circuit is used to increase the voltage of the pulse signal and output it to the anti-interference module.

9. An electrical device, characterized in that, Includes a DC motor and a drive device for the DC motor as described in any one of claims 1-8.

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