Motor driving circuit, motor driving system and electronic equipment

Abstract

The utility model relates to the field of BLDC motor control, which comprises a PWM signal input end and a PWM signal output end, and the PWM signal output end is connected with a PWM control pin and is used for outputting a PWM signal through the PWM control pin. And the EN driving module is used for outputting an EN signal and comprises a rectification unit, the input end of the rectification unit is connected with the PWM signal output end, the output end of the rectification unit is connected with the EN pin, and the rectification unit is used for rectifying the PWM signal into the EN signal and outputting the EN signal through the EN pin. The beneficial effects of the utility model are that the requirement for MCU pins can be reduced, the MCU is simplified, a PWM signal and an EN signal can be output through one PWM signal input end, and the system cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of BLDC motor control, and specifically relates to a motor drive circuit, system and electronic equipment. Background Art

[0002] BLDC is a brushless DC motor, which consists of a motor body and a driver. A brushless motor is a motor without brushes and commutators (or collector rings), also known as a commutatorless motor. This motor overcomes the inherent defects of brushed DC motors and replaces the mechanical commutator with an electronic commutator. The BLDC control drive port is usually three drive ports, namely: EN (enable) pin, PWM (duty cycle) control pin and FG (speed feedback) pin.

[0003] At present, the existing BLDC motor control drive circuit uses EN and PWM control pins, which occupy multiple pins of the MCU (microcontroller), increase the number of MCU pins, increase the complexity of the circuit, increase the difficulty of design, and lead to unnecessary waste of resources. Utility Model Content

[0004] In order to solve the deficiencies of the prior art, the utility model provides a motor drive circuit, system and electronic equipment.

[0005] The technical effects to be achieved by the utility model are achieved through the following technical aspects:

[0006] In a first aspect, the utility model provides a motor drive circuit for driving a motor module, wherein the motor module includes a PWM control pin and an EN pin, and the motor drive circuit includes:

[0007] A PWM driving module, comprising a PWM signal input terminal and a PWM signal output terminal, wherein the PWM signal output terminal is connected to a PWM control pin and is used to output a PWM signal to the PWM control pin; and

[0008] The EN driving module is used to output an EN signal, comprising a rectifier unit, an input end of the rectifier unit is connected to the PWM signal output end, and an output end of the rectifier unit is connected to the EN pin, for rectifying the PWM signal into an EN signal and outputting the EN signal to the EN pin.

[0009] In some embodiments of the present application, the rectifying unit includes a first capacitor, one end of the first capacitor is connected to the PWM signal output end, and the other end of the first capacitor is grounded, for rectifying the PWM signal and outputting a high level.

[0010] In some embodiments of the present application, the rectifying unit further includes a first resistor, and the first resistor is connected in parallel with the first capacitor.

[0011] In some embodiments of the present application, the EN driving module further includes a first diode, an anode of the first diode is connected to the PWM signal output end, and a cathode of the first diode is connected to the input end of the rectifier unit.

[0012] In some embodiments of the present application, the EN driving module further includes a second resistor, and the second resistor is connected in series between the rectifying unit and the first diode.

[0013] In some embodiments of the present application, the PWM driving module includes a third resistor and a second capacitor, one end of the second capacitor is connected to the PWM signal input end, the other end of the second capacitor is grounded, and the third resistor is arranged in parallel with the second capacitor.

[0014] In some embodiments of the present application, the PWM driving module further includes a second diode, an anode of the second diode is connected to the PWM signal input terminal, and a cathode of the second diode is connected to the third resistor.

[0015] In some embodiments of the present application, a speed feedback module is further included, wherein the speed feedback module includes a feedback input terminal and a feedback output terminal, and the feedback output terminal is connected to the feedback control pin for performing speed feedback through the feedback control pin.

[0016] In a second aspect, the utility model provides a motor drive system, the motor drive system comprising a motor drive circuit, a BMS main control module and a motor module, the output end of the BMS main control module is connected to the input end of the motor drive circuit; the output end of the motor drive circuit is connected to the input end of the motor module;

[0017] Wherein, the motor driving circuit is any one of the motor driving circuits described above.

[0018] In a third aspect, the utility model further provides an electronic device, comprising the motor drive circuit described in any one of the above technical solutions.

[0019] In summary, the utility model has the following benefits:

[0020] The motor drive circuit of the utility model can reduce the demand for MCU pins by converting PWM signals into EN signals, simplify the MCU, and output PWM signals and EN signals through one PWM signal input terminal, thereby reducing system costs. At the same time, the saved MCU pins can also realize other functions, thereby improving the flexibility and scalability of the system. Reducing the demand for pins can also further simplify wiring, which helps to reduce the overall area of ​​the system, make the system more compact, and improve the integration of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the motor drive circuit in the embodiment of the present application.

[0022] Figure 2 is a circuit diagram of a motor drive circuit in an embodiment of the present application.

[0023] Figure 3 Schematic diagram of a motor control system in an embodiment of the present application.

[0024] Figure 4 It is a schematic diagram of the structure of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. The described implementation is a part of the implementation of the utility model, not all of the implementations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. 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.

[0027] Example 1

[0028] Please see attached Figure 1-2 The motor drive circuit of the utility model includes: a PWM drive module for transmitting a PWM signal. The PWM signal is a pulse width modulation, which is an analog control method. The bias of the transistor base or the MOS tube gate is modulated according to the change of the corresponding load to achieve the change of the transistor or MOS tube conduction time, thereby achieving the change of the output of the switching regulated power supply. The PWM drive module includes a PWM signal input end and a PWM signal output end, and the PWM signal input end is connected to an external control module.

[0029] The EN driving module is used to output an EN signal, which is an enable signal. The EN driving module includes a rectifier unit, wherein the input end of the rectifier unit is connected to the PWM signal output end, and the output end of the rectifier unit is connected to the EN pin. The rectifier unit is used to rectify the PWM signal into an EN signal and output it through the EN pin. The rectifier unit can convert the PWM signal into a high-level EN signal. At this time, one of the PWM signal output ends outputs the PWM signal through the PWM control pin, and the other PWM signal output end is converted into an EN signal through the rectifier unit for output.

[0030] By connecting the EN driver module with the PWM driver module, the demand for MCU pins can be reduced, the MCU can be simplified, and the PWM signal and EN signal can be output through one PWM signal input terminal, thereby reducing system costs. At the same time, the saved MCU (microcontroller) pins can also realize other functions, thereby improving the flexibility and scalability of the system. Reducing the demand for pins can also further simplify wiring, which helps to reduce the overall area of ​​the system, make the system more compact, and improve the integration of the circuit board.

[0031] In some embodiments, the rectifier unit includes a first capacitor C14, one end of the first capacitor C14 is connected to the PWM signal output end, and the other end of the first capacitor C14 is grounded, for rectifying the PWM signal and outputting a high level. The conversion of the EN signal is achieved by charging and discharging the first capacitor C14, PWM charges the first capacitor C14 during the duration of the high level, the first capacitor C14 accumulates charge, and the first capacitor C14 discharges and releases the charge during the duration of the low level. Among them, the amount of charge accumulated by the first capacitor C14 is greater than the amount of charge released, so that the direct wave voltage at both ends of the first capacitor C14 continues to climb, and when the accumulated charge and the released charge of the first capacitor C14 reach stability, the first capacitor C14 will output a stable high-level EN signal to complete the signal conversion.

[0032] It can be understood that the capacitance value of the first capacitor C14 can be selected according to the characteristics of the PWM signal to perform stable signal conversion on the PWM signal, and the present application does not make any specific limitation on its capacitance value.

[0033] In some embodiments, the rectifier unit further includes a first resistor R20, and the first resistor R20 is connected in parallel with the first capacitor C14. While rectifying, the signal is filtered so that the output signal is stable and reliable. In a specific design, the parameters of the first battery C14 and the first resistor R20 should be adapted in combination with the response speed of the PWM signal, the output voltage, etc., so that the PWM signal can be converted into an EN signal.

[0034] Further, the EN driving module also includes a first diode D15, the positive electrode of the first diode D15 is connected to the PWM signal output end, and the negative electrode of the first diode D15 is connected to the input end of the rectifier unit. The negative electrode of D15 is connected to the first resistor R20 to rectify the PWM signal output from the PWM signal output end. The EN driving module also includes a second resistor R18, which is connected in series between the rectifier unit and the first diode D15. The above-mentioned first diode D15 and the second resistor R18 can improve the stability of the circuit. Of course, their specific values ​​and settings can be determined according to actual conditions.

[0035] In some embodiments, the PWM driving module includes a third resistor R100 and a second capacitor C56, one end of the second capacitor C56 is connected to the PWM signal input end, the other end of the second capacitor C56 is grounded, and the third resistor R100 and the second capacitor C56 are arranged in parallel. The PWM signal is filtered by the third resistor R100 and the second capacitor C56, and the filtered PWM signal is output to the PWM control pin. Through the filtering effect of the third resistor R100 and the second capacitor C56, the driving effect of the output PWM signal can be made more reliable.

[0036] In some embodiments, the PWM driving module further includes a second diode D13, an anode of the second diode D13 is connected to the PWM signal input terminal, and a cathode of the second diode D13 is connected to the third resistor.

[0037] Example 2

[0038] The difference between this embodiment and embodiment 1 is that this embodiment further optimizes the motor drive circuit. Figure 2. It also includes a speed feedback module to provide feedback on the speed of the motor. The speed feedback module includes a feedback input terminal and a feedback output terminal. The feedback output terminal is connected to the feedback control pin 2 and is used to provide speed feedback through the feedback control pin 2. Exemplarily, one end of the speed feedback module is connected to the feedback control pin 2, and one end is connected in parallel with a resistor R103 and a resistor R101, wherein the first end of the resistor R103 is externally connected to a 5v voltage, and the first end of R101 is used to output feedback data. The resistor R103 is connected in parallel with the second end of the resistor R101, and a rectifier diode D14 is arranged between the second end of R103 and R101 and the feedback control pin 2, the positive pole of D14 is connected to the second end of the resistor R103 and the resistor R101, the negative pole of D14 is connected to the collector of the transistor, the emitter of the transistor is grounded, and the base of the transistor is connected to a filter circuit. Exemplarily, the filter circuit is an RC filter circuit, and the resistor and the capacitor are connected in parallel for filtering. The output end of the filter circuit is connected to the feedback control pin 2, and a resistor is connected between the filter circuit and the feedback control pin 2. During use, the feedback control pin 2 outputs a feedback signal. At this time, the feedback signal turns on the base of the transistor through the resistor and the filter circuit, the transistor is turned on, and the resistor R103 and the resistor R101 divide the voltage for feedback.

[0039] Example 3

[0040] This embodiment provides a motor drive system, which is applied to a motor and used to control the motor. Figure 3 , including a motor drive circuit, a BMS main control module and a BLDC module. The BLDC module includes an EN pin and a PWM control pin, and the PWM signal input terminal is connected to the BMS main control module. The motor drive system is externally connected to a power supply. During use, the BMS main control module inputs the corresponding PWM signal, and the motor drive circuit converts the input PWM signal into a stable EN signal and PWM signal, and outputs it to the BLDC module. This control module can output PWM signals and EN signals by using one PWM signal input terminal, which can reduce the number of pins and reduce costs. At the same time, the saved MCU pins can also realize other functions, improving the flexibility and scalability of the system; reducing the demand for pins can also further simplify wiring, which helps to reduce the overall area of ​​the system, make the system more compact, and improve the integration of the circuit board.

[0041] Example 4

[0042] This embodiment provides an electronic device, such as Figure 4 As shown, the electronic device may be a vacuum cleaner, a sweeping robot, a refrigerator, or an electronic device with a motor, and the electronic device may include Figure 1-2The motor drive circuit in any embodiment includes a motor drive circuit and a motor body. The motor body includes a stator, a rotor, a bearing, a housing, etc. The motor drive circuit control is arranged in the motor. The motor drive circuit is used to transmit a PWM signal and an EN signal to control the motor. Since the motor drive power can output a PWM signal and an EN signal using a PWM signal input terminal, the electronic device of this embodiment can save costs. At the same time, the saved pins can be added with other functions to improve the performance of the electronic device.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0045] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0046] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A motor drive circuit for driving a motor module, wherein the motor module comprises a PWM control pin and an EN pin, wherein: include: A PWM driving module, comprising a PWM signal input terminal and a PWM signal output terminal, wherein the PWM signal output terminal is connected to a PWM control pin and is used to output a PWM signal to the PWM control pin; as well as The EN driving module is used to output an EN signal, comprising a rectifier unit, an input end of the rectifier unit is connected to the PWM signal output end, and an output end of the rectifier unit is connected to the EN pin, for rectifying the PWM signal into an EN signal and outputting the EN signal to the EN pin.

2. The motor drive circuit according to claim 1, characterized in that: The rectifying unit comprises a first capacitor, one end of which is connected to the PWM signal output end, and the other end of which is grounded, and is used for rectifying the PWM signal and outputting a high level.

3. The motor drive circuit according to claim 2, characterized in that: The rectifying unit further includes a first resistor, and the first resistor is connected in parallel with the first capacitor.

4. The motor drive circuit according to claim 1, characterized in that: The EN driving module further includes a first diode, wherein an anode of the first diode is connected to the PWM signal output end, and a cathode of the first diode is connected to an input end of the rectifying unit.

5. The motor drive circuit according to claim 4, characterized in that: The EN driving module further includes a second resistor, which is connected in series between the rectifying unit and the first diode.

6. The motor drive circuit according to claim 1, characterized in that: The PWM driving module includes a third resistor and a second capacitor, one end of the second capacitor is connected to the PWM signal input end, the other end of the second capacitor is grounded, and the third resistor is arranged in parallel with the second capacitor.

7. The motor drive circuit according to claim 6, characterized in that: The PWM driving module further includes a second diode, an anode of the second diode is connected to the PWM signal input terminal, and a cathode of the second diode is connected to the third resistor.

8. The motor drive circuit according to claim 1, characterized in that: It also includes a speed feedback module, which includes a feedback input terminal and a feedback output terminal. The feedback output terminal is connected to a feedback control pin and is used for performing speed feedback through the feedback control pin.

9. A motor drive system, characterized in that: The motor drive system includes a motor drive circuit, a BMS main control module and a motor module, wherein the output end of the BMS main control module is connected to the input end of the motor drive circuit; the output end of the motor drive circuit is connected to the input end of the motor module; Wherein, the motor drive circuit is the motor drive circuit described in any one of claims 1-8.

10. An electronic device, characterized in that: The motor drive circuit comprises any one of claims 1 to 8.

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