阅读说明：本技术 电机驱动电路、电机和电器设备 (Motor drive circuit, motor and electrical equipment ) 是由 王琰 曹姣容 漆凌君 陈东锁 吴泽滨 赵盼瑶 陈焕严 于 2019-08-28 设计创作，主要内容包括：本申请公开了一种电机驱动电路、电机和电器设备。电机驱动电路,包括：驱动模块、脉冲抑制模块、与所述驱动模块连接的自举升压模块、开关模块；其中,所述驱动模块、所述开关模块、脉冲抑制模块分别连接电机相线连接端；所述自举升压模块,用于为所述驱动模块提升电压；所述驱动模块,用于基于所述提升的电压,控制所述开关模块的截止和导通,以便为所述电机相线连接端提供驱动信号；所述脉冲抑制模块,用于在所述开关模块导通和截止时,抑制所述电机相线连接端产生的尖峰脉冲。如此,避免了脉冲幅值过大将电机驱动电路中自举升压模块的自举升压二极管等过压击穿,提高了安全可靠性,减少了电磁干扰,改善了电磁兼容性。(The application discloses motor drive circuit, motor and electrical equipment. A motor drive circuit comprising: the pulse suppression circuit comprises a driving module, a pulse suppression module, a bootstrap boosting module and a switch module, wherein the bootstrap boosting module is connected with the driving module; the driving module, the switch module and the pulse suppression module are respectively connected with a motor phase line connecting end; the bootstrap boosting module is used for boosting voltage for the driving module; the driving module is used for controlling the cut-off and the conduction of the switch module based on the boosted voltage so as to provide a driving signal for the phase line connecting end of the motor; and the pulse suppression module is used for suppressing spike pulse generated by the phase line connecting end of the motor when the switch module is switched on and switched off. Therefore, overvoltage breakdown of a bootstrap boost diode of a bootstrap boost module in the motor driving circuit and the like due to overlarge pulse amplitude is avoided, safety and reliability are improved, electromagnetic interference is reduced, and electromagnetic compatibility is improved.)

1. A motor drive circuit, comprising: the pulse suppression circuit comprises a driving module, a pulse suppression module, a bootstrap boosting module and a switch module, wherein the bootstrap boosting module is connected with the driving module; wherein the content of the first and second substances,

The driving module, the switch module and the pulse suppression module are respectively connected with a motor phase line connecting end;

The bootstrap boosting module is used for boosting voltage for the driving module;

The driving module is used for controlling the cut-off and the conduction of the switch module based on the boosted voltage so as to provide a driving signal for the phase line connecting end of the motor;

And the pulse suppression module is used for suppressing spike pulse generated by the phase line connecting end of the motor when the switch module is switched on and switched off.

2. The motor drive circuit of claim 1, wherein the pulse suppression module comprises: an integrating circuit;

The integrating circuit is connected with the motor phase line connecting end and used for integrating the spike pulse generated by the motor phase line connecting end when the switch module is switched on and switched off so as to buffer the spike pulse.

3. The motor drive circuit of claim 2, wherein the integration circuit comprises a first resistor and a first capacitor;

the first end of the first resistor is connected with the motor phase line connecting end, and the second end of the first resistor is connected with the first end of the first capacitor;

and the second end of the first capacitor is connected with a first power supply end.

4. the motor drive circuit of claim 3, wherein the pulse suppression module further comprises: a discharge circuit and a first diode; the first diode is a Zener voltage stabilizing diode;

The cathode of the first diode is connected with the first end of the first capacitor, and the anode of the first diode is connected with the second end of the first capacitor;

The first end of the discharge circuit is connected with the first end of the first capacitor, and the second end of the discharge circuit is connected with the second end of the first capacitor;

The first diode is used for being broken down reversely when the spike pulse reaches a preset amplitude value so as to improve the voltage difference between two ends of the discharge circuit and enable the integration circuit to discharge through the discharge circuit.

5. the motor drive circuit of claim 4, wherein the discharge circuit comprises a second resistor;

And the first end of the second resistor is connected with the first end of the first capacitor, and the second end of the second resistor is connected with the second end of the first capacitor.

6. the motor drive circuit according to claim 3, wherein the switching module includes a first switching transistor, a second switching transistor, a third resistor, and a fourth resistor;

the grid electrode of the first switching transistor is connected with the high-side grid electrode driving output end of the driving module through a third resistor, the source electrode of the first switching transistor is connected with the first power supply end, and the drain electrode of the first switching transistor is connected with the motor phase line connecting end;

and the grid electrode of the second switching transistor is connected with the low-side grid electrode driving output end of the driving module through a fourth resistor, the drain electrode of the second switching transistor is grounded through the second filtering module, and the source electrode of the second switching transistor is connected with the phase line connecting end of the motor.

7. The motor drive circuit of claim 1, wherein the bootstrap boost module comprises a second diode and a second capacitor;

The anode of the second diode is connected with a second power supply end, and the cathode of the second diode is connected with the first end of the second capacitor and the high-end floating supply end of the driving module;

The second end of the second capacitor is connected with the feedback floating supply end of the driving module;

and the feedback floating supply end of the driving module is connected with the phase line connecting end of the motor.

8. An electric motor comprising a motor drive circuit according to any one of claims 1 to 7.

9. The motor of claim 8, wherein the motor is a brushless motor.

10. An electrical apparatus, characterized in that it comprises an electric machine according to claim 8 or 9.

Technical Field

The application relates to the technical field of motors, in particular to a motor driving circuit, a motor and electrical equipment.

Background

Brushless dc motors have been widely used in electrical equipment such as air conditioners because of their advantages such as operating efficiency, low-speed torque, and rotational speed accuracy.

Disclosure of Invention

The application aims to provide a motor driving circuit, a motor and electrical equipment so as to solve the problem that spike pulses can be generated in the motor driving circuit in the related art.

The purpose of the application is realized by the following technical scheme:

a motor drive circuit comprising: the pulse suppression circuit comprises a driving module, a pulse suppression module, a bootstrap boosting module and a switch module, wherein the bootstrap boosting module is connected with the driving module; wherein the content of the first and second substances,

The driving module, the switch module and the pulse suppression module are respectively connected with a motor phase line connecting end;

The bootstrap boosting module is used for boosting voltage for the driving module;

The driving module is used for controlling the cut-off and the conduction of the switch module based on the boosted voltage so as to provide a driving signal for the phase line connecting end of the motor;

And the pulse suppression module is used for suppressing spike pulse generated by the phase line connecting end of the motor when the switch module is switched on and switched off.

optionally, the pulse suppression module includes: an integrating circuit;

The integrating circuit is connected with the motor phase line connecting end and used for integrating the spike pulse generated by the motor phase line connecting end when the switch module is switched on and switched off so as to buffer the spike pulse.

optionally, the integrating circuit includes a first resistor and a first capacitor;

The first end of the first resistor is connected with the motor phase line connecting end, and the second end of the first resistor is connected with the first end of the first capacitor;

The second end of the first capacitor is connected with a first power supply end; the first power supply end is grounded through the first filtering module.

Optionally, the pulse suppression module further includes: a discharge circuit and a first diode; the first diode is a Zener voltage stabilizing diode;

The cathode of the first diode is connected with the first end of the first capacitor, and the anode of the first diode is connected with the second end of the first capacitor;

the first end of the discharge circuit is connected with the first end of the first capacitor, and the second end of the discharge circuit is connected with the second end of the first capacitor;

the first diode is used for being broken down reversely when the spike pulse reaches a preset amplitude value so as to improve the voltage difference between two ends of the discharge circuit and enable the integration circuit to discharge through the discharge circuit.

optionally, the discharge circuit includes a second resistor;

And the first end of the second resistor is connected with the first end of the first capacitor, and the second end of the second resistor is connected with the second end of the first capacitor.

Optionally, the switch module includes a first switch transistor, a second switch transistor, a third resistor, and a fourth resistor;

the grid electrode of the first switching transistor is connected with the high-side grid electrode driving output end of the driving module through a third resistor, the source electrode of the first switching transistor is connected with the first power supply end, and the drain electrode of the first switching transistor is connected with the motor phase line connecting end;

And the grid electrode of the second switching transistor is connected with the low-side grid electrode driving output end of the driving module through a fourth resistor, the drain electrode of the second switching transistor is grounded through the second filtering module, and the source electrode of the second switching transistor is connected with the phase line connecting end of the motor.

Optionally, the bootstrap boost module includes a second diode and a second capacitor;

The anode of the second diode is connected with a second power supply end, and the cathode of the second diode is connected with the first end of the second capacitor and the high-end floating supply end of the driving module;

The second end of the second capacitor is connected with the feedback floating supply end of the driving module;

And the feedback floating supply end of the driving module is connected with the phase line connecting end of the motor.

An electric motor comprising a motor drive circuit as claimed in any preceding claim.

Optionally, the motor is a brushless motor.

An electrical appliance comprising an electrical machine as claimed in any preceding claim.

this application adopts above technical scheme, has following beneficial effect:

In the scheme of this application, the pulse suppression module has been add in motor drive circuit, this pulse suppression module links to each other with motor phase line link, drive module is based on the voltage that the bootstrap boost module promoted, control switch module's cutting off and switching on, for the in-process that motor phase line link provided drive signal, if cut off and when switching on at switch module, because motor leakage inductance and switching device parasitic capacitance's existence, motor phase line link produces spike pulse, can restrain the increase of spike pulse with the pulse suppression module, avoid pulse amplitude too big with motor drive circuit in the overvoltage breakdown such as bootstrap boost diode of bootstrap boost module, safety and reliability have been improved, electromagnetic interference has been reduced, electromagnetic compatibility has been improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

fig. 1 is a schematic structural diagram of a motor driving circuit according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a motor driving circuit according to another embodiment of the present application.

Fig. 3 is a waveform diagram of a spike pulse according to another embodiment of the present application.

fig. 4 is a waveform diagram of a spike pulse according to another embodiment of the present application.

Detailed Description

in order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.