CN216216605U - Motor drive circuit and electrical equipment - Google Patents

Abstract

The application discloses motor drive circuit and electrical equipment, motor drive circuit include the control unit, step up module, first switch module, second switch module and third switch module. The boost module is used for boosting the voltage output by the control unit and outputting a first voltage, the first switch module is used for being switched on or switched off according to a first control signal output by the control unit so as to establish or switch off the connection between the second end of the boost module and the first end of the second switch module, the second switch module is used for being switched on or switched off according to the first voltage so as to establish or switch off the connection between the first power supply and the first input end of the motor, and the third switch module is used for being switched on or switched off according to a second control signal output by the control unit so as to establish or switch off the connection between the second input end of the motor and the ground. By the mode, the motor driving circuit has the advantages of high applicability and low cost.

Description

Motor drive circuit and electrical equipment

Technical Field

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

Background

With the development of battery technology, electrical equipment used in life is more and more portable, for example, a household handheld blender is cordless, and the required functions can be realized by adopting a lithium battery for power supply and controlling a motor to operate. Wherein, in order to make control comparatively simple, the motor adopts brush direct current motor usually.

Currently, in the prior art, a mechanical switch is generally used to drive the motor, i.e., to control the operation of the motor. However, the rated current that can flow through a general mechanical switch is small, and the applicable scenarios are few, and if a mechanical switch that can flow a large current is used, the cost is high.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application aims at providing the motor driving circuit and the electrical equipment, so that the motor driving circuit is high in applicability and low in cost.

To achieve the above object, in a first aspect, the present application provides a motor drive circuit comprising:

the boost control circuit comprises a control unit, a boost module, a first switch module, a second switch module and a third switch module;

the first end of the boosting module is connected with the control unit, and the boosting module is used for boosting the voltage output by the control unit and outputting a first voltage;

the first end of the first switch module is connected with the second end of the boosting module, the second end of the first switch module is connected with the first end of the second switch module, the third end of the first switch module is connected with the control unit, and the first switch module is used for being switched on or off according to a first control signal output by the control unit so as to establish or disconnect the connection between the second end of the boosting module and the first end of the second switch module;

the second end of the second switch module is connected with a first power supply, the third end of the second switch module is respectively connected with the third end of the boosting module and the first input end of the motor, and the second switch module is used for being switched on or off according to the first voltage so as to establish or disconnect the connection between the first power supply and the first input end of the motor;

the first end of the third switch module is connected with the control unit, the second end of the third switch module is grounded, the third end of the third switch module is connected with the second input end of the motor, and the third switch module is used for being switched on or switched off according to a second control signal output by the control unit so as to establish or disconnect the connection between the second input end of the motor and the ground.

In an optional manner, the boost module includes a first inductor, a first diode, a first capacitor, a first resistor, a second resistor, a first switching tube, and a first zener diode;

the first end of the first inductor is connected with the control unit, the second end of the first inductor is connected with the third end of the first switch tube and the anode of the first diode, the cathode of the first diode is connected with the first end of the first capacitor, the cathode of the first voltage stabilizing diode and the first end of the first switch module, the second end of the first capacitor is connected with the anode of the first voltage stabilizing diode and the third end of the second switch module, the first end of the first switch tube is connected with the first end of the first resistor and the first end of the second resistor, the second end of the first resistor is connected with the control unit, and the second end of the first switch tube and the second end of the second resistor are both grounded.

In an optional manner, the first switch module includes a first switch unit and a second switch unit;

the first end of the first switch unit is connected with the control unit, the second end of the first switch unit is connected with the first end of the second switch unit, the second end of the second switch unit is connected with the second end of the boosting module, and the third end of the second switch unit is connected with the first end of the second switch module;

the first switch unit is used for switching on or off according to the first control signal;

the second switch unit is used for being switched on or off according to the switching on or off of the first switch unit so as to establish or disconnect the connection between the second end of the boosting module and the first end of the second switch module;

the first end of the first switch unit is the third end of the first switch module, the second end of the second switch unit is the first end of the first switch module, and the third end of the second switch unit is the second end of the first switch module.

In an optional mode, the first switching unit includes a second switching tube, a third resistor, a fourth resistor, and a second capacitor;

the first end of the second switch tube is connected with the first end of the third resistor, the second end of the third resistor is connected with the second power supply and the first end of the second capacitor, the second end of the second capacitor is grounded, the second end of the second switch tube is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the control unit, and the third end of the second switch tube is connected with the second switch unit.

In an optional mode, the second switch unit comprises a third switch tube and a fifth resistor;

the first end of the third switching tube is connected with the second end of the first switching unit and the first end of the fifth resistor, the second end of the third switching tube is connected with the second end of the fifth resistor and the second end of the boosting module, and the third end of the third switching tube is connected with the first end of the second switching module.

In an optional manner, the second switch module includes a fourth switch tube, a second diode, a sixth resistor, and a seventh resistor;

the first end of fourth switch tube with the sixth resistance and the first end of seventh resistance is connected, the second end of sixth resistance with the negative pole of second diode is connected, the positive pole of second diode with the second end of first switch module is connected, the second end of seventh resistance with the second end of fourth switch tube and the first input of motor is connected, the third end of fourth switch tube with first power is connected.

In an optional manner, the third switching module includes a fifth switching tube, an eighth resistor, and a ninth resistor;

the first end of the fifth switching tube is connected with the first end of the eighth resistor and the first end of the ninth resistor, the second end of the eighth resistor is connected with the control unit, the second end of the fifth switching tube is grounded with the second end of the ninth resistor, and the third end of the fifth switching tube is connected with the second input end of the motor.

In an optional mode, the motor driving circuit further comprises a tenth resistor and an eleventh resistor which are connected in series;

the first end of a resistor branch circuit formed by connecting a tenth resistor and an eleventh resistor in series is connected with the second end of the boosting module, the second end of the resistor branch circuit is grounded, and the midpoint of the resistor branch circuit is connected with the control unit.

In an optional mode, the motor driving circuit further includes a sixth switching tube and a twelfth resistor;

the first end of the sixth switching tube is connected with the first end of the twelfth resistor and the second end of the first switching module, the second end of the sixth switching tube is connected with the fourth end of the second switching module, and the third end of the sixth switching tube is connected with the second end of the twelfth resistor and the third end of the second switching module.

In a second aspect, the present application provides an electrical appliance comprising a motor and a motor drive circuit as described above.

The beneficial effects of the embodiment of the application are that: the application provides a motor drive circuit includes the control unit, steps up module, first switch module, second switch module and third switch module. The boost module is used for boosting the voltage output by the control unit and outputting a first voltage, the first switch module is used for being switched on or switched off according to a first control signal output by the control unit so as to establish or switch off the connection between the second end of the boost module and the first end of the second switch module, the second switch module is used for being switched on or switched off according to the first voltage so as to establish or switch off the connection between the first power supply and the first input end of the motor, and the third switch module is used for being switched on or switched off according to a second control signal output by the control unit so as to establish or switch off the connection between the second input end of the motor and the ground. The second switch module and the third switch module are switch modules controlled by electric signals, and compared with the technical scheme of adopting a mechanical switch in the prior art, the current which can flow through the second switch module and the third switch module is larger, so that the switch module is suitable for more application scenes, and the applicability is stronger. And, because of adopting electronic switch, the cost is also lower than mechanical switch.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

Fig. 1 is a schematic structural diagram of a motor driving circuit according to an embodiment of the present disclosure;

fig. 2 is a schematic circuit structure diagram of a motor driving circuit according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a motor driving circuit according to an embodiment of the present disclosure. As shown in fig. 1, the motor driving circuit includes a boosting module 10, a first switching module 20, a second switching module 30, a third switching module 40, and a control unit 50. Wherein, the first end of the boosting module 10 is connected with the control unit 50; a first end of the first switch module 20 is connected with a second end of the boost module 10, a second end of the first switch module 20 is connected with a first end of the second switch module 30, and a third end of the first switch module 20 is connected with the control unit 50; a second end of the second switch module 30 is connected with the first power supply V1, and a third end of the second switch module 30 is connected with a third end of the boost module 10 and a first input end of the motor M1, respectively; a first end of the third switching module 40 is connected to the control unit 50, a second end of the third switching module 40 is grounded GND, and a third end of the third switching module 40 is connected to a second input end of the motor M1.

Specifically, the control unit 50 may output a voltage to a first terminal of the voltage boosting module 10, and the voltage boosting module 10 may output a first voltage from a second terminal thereof after boosting the voltage.

The first switch module 20 is controlled by the control unit 50, and the first switch module 20 is turned on or off according to a first control signal output by the control unit 50 to establish or break a connection between the second terminal of the boost module 10 and the first terminal of the second switch module 30. In one embodiment, if the first switch module 20 is turned on, the connection between the second end of the boost module 10 and the first end of the second switch module 30 is established; conversely, if the first switch module 20 is disconnected, the connection between the second end of the boost module 10 and the first end of the second switch module 30 is also disconnected.

Then, when the connection is established between the second terminal of the boost module 10 and the first terminal of the second switch module 30, the first voltage is input to the second switch module 30. The second switching module 30 may be turned on or off according to the first voltage to establish or break the connection between the first power source V1 and the first input terminal of the motor M1. In one embodiment, if the first voltage is at a high level, the second switch module 30 is turned on, and the first power source V1 is connected to the first input terminal of the motor M1; on the contrary, if the first voltage is low, the second switch module 30 is turned off, and the connection between the first power source V1 and the first input terminal of the motor M1 is also turned off.

The third switching module 40 may be turned on or off according to the second control signal output by the control unit 50 to establish or break the connection between the second input terminal of the motor M1 and the ground GND. In one embodiment, if the third switching module 40 is turned on, the connection between the second input terminal of the motor M1 and the ground GND is established; on the contrary, if the third switching module 40 is turned off, the connection between the second input terminal of the motor M1 and the ground GND is turned off.

It can be understood that, in this embodiment, the second switch module 30 and the third switch module 40 are switch modules controlled by electrical signals, and compared with a technical scheme that a mechanical switch is adopted in the prior art, the current that can flow is larger, so that the switch module can be applied to more application scenarios, and the applicability is stronger. And, the cost is also low relative to mechanical switches.

Meanwhile, the motor M1 is driven and operated only when the first terminal of the motor M1 is connected to the first power source V1 and the second terminal of the motor M2 is connected to the ground GND. Thus, when it is necessary to stop the motor operation, it is possible to stop the motor operation by disconnecting the first terminal of the motor M1 from the first power source V1 and/or disconnecting the second terminal of the motor M2 from the ground GND. Therefore, when any one of the second switch module 30 or the third switch module 40 is abnormal, for example, when a short circuit is abnormal, the motor can be stopped in time by the module without the abnormality, so that the risk of the abnormality of the motor driving circuit can be reduced, and the stability of the operation can be improved.

In an embodiment, referring to fig. 2 in combination with fig. 1, the boost module 10 includes a first inductor L1, a first diode D1, a first capacitor C1, a first resistor R1, a second resistor R2, a first switch tube Q1, and a first voltage regulator DW 1. A first end of the first inductor L1 is connected to the control unit 50 through the interface S1, a second end of the first inductor L2 is connected to a third end of the first switch tube Q1 and an anode of the first diode D1, a cathode of the first diode D1 is connected to a first end of the first capacitor C1, a cathode of the first zener diode DW1, and a first end of the first switch module 20, a second end of the first capacitor C1 is connected to an anode of the first zener diode DW1 and a third end of the second switch module 30, a first end of the first switch tube Q1 is connected to a first end of the first resistor R1 and a first end of the second resistor R2, a second end of the first resistor R1 is connected to the control unit 50 through the interface S2, and a second end of the first switch tube Q1 and a second end of the second resistor R2 are both grounded GND. In this embodiment, the first switch Q1 is an NMOS transistor, for example.

Specifically, when the control signal output by the control unit 50 controls the first switch Q1 to be turned on through the interface S2, the voltage output by the control unit 50 flows through the first inductor L1 through the interface S1. Since the voltage output by the control unit 50 is a dc voltage, the current in the first inductor L1 increases linearly at a ratio related to the inductance of the first inductor L1. As the current of the first inductor L1 increases, energy is stored on the first inductor L1.

When the control signal output by the control unit 50 controls the first switching tube Q1 to be turned off through the interface S2, the current flowing through the first inductor L1 does not immediately become 0 but slowly becomes 0 from the stored energy due to the current maintaining characteristic of the first inductor L1. When the original loop for storing energy of the first inductor L1 is disconnected, the first inductor L1 needs to discharge through a new loop, and the first inductor L1 starts to charge the first capacitor C1, so that the voltage across the first capacitor C1 (i.e., the first voltage) is higher than the input voltage, thereby completing the boosting process. It can be seen that in this embodiment, the control signal output by the control unit 50 may be a PWM signal.

In summary, the boost module 10 implements a boost process through the energy transfer process of the first inductor L1, wherein the first inductor L1 absorbs energy during charging and the first inductor L1 discharges energy during discharging. By adopting the boosting module 10, the motor driving circuit can be applicable to different input power supplies, and the practicability is improved. Secondly, first zener diode DW1 can play the clamping effect to first voltage to prevent that first voltage is too big and damage subsequent electrical components, be favorable to motor drive circuit's steady operation.

In this embodiment, the input voltage of the booster module 10 is taken as the voltage output by the control unit 50 as an example. In other embodiments, the input voltage of the boost module 10 may also be derived from other power sources, for example, the first power source provided in the embodiment of the present application, and the embodiment of the present application is not limited thereto.

Meanwhile, in the embodiment of the application, any switching tube can be selected from switching devices such as a triode, an MOS tube or an IGBT switching tube, and the switching tubes can be the same or different. Specifically, the first switching tube Q1 is taken as an example.

If the first switch tube Q1 is a triode, the base of the triode is the first end of the first switch tube Q1, the emitter of the triode is the second end of the first switch tube Q1, and the collector of the triode is the third end of the first switch tube Q1.

If the first switch transistor Q1 is an MOS transistor, the gate of the MOS transistor is the first end of the first switch transistor Q1, the source of the MOS transistor is the second end of the first switch transistor Q1, and the drain of the MOS transistor is the third end of the first switch transistor Q1.

If the first switch tube Q1 is an IGBT switch tube, the gate of the IGBT switch tube is the first end of the first switch tube Q1, the emitter of the IGBT switch tube is the second end of the first switch tube Q1, and the collector of the IGBT switch tube is the third end of the first switch tube Q1.

Further, in an embodiment, the motor driving circuit further includes a tenth resistor R10 and an eleventh resistor R11. The first end of the resistor branch formed by the tenth resistor R10 and the eleventh resistor R11 connected in series is connected to the second end of the boost module 10, the second end of the resistor branch is grounded GND, and the midpoint of the resistor branch is connected to the control unit 50 through the interface S5.

The resistor branch is used for collecting a voltage (i.e., a first voltage) on the first capacitor C1, dividing the voltage, and transmitting the divided voltage to the control unit 50, so that the control unit 50 obtains the first voltage. Then, when the control unit 50 can adjust the duty ratio of the PWM signal output by the control unit 50 according to the first voltage detected in real time, so that the first voltage is maintained within the preset voltage range, which is helpful for the stable operation of the motor driving circuit. For example, if the control unit 50 detects that the first voltage is greater than the maximum value of the preset voltage range, the duty ratio of the PWM signal may be decreased to adjust the first voltage to be within the preset voltage range.

In one embodiment, the first switch module 20 includes a first switch unit 21 and a second switch unit 22. A first end of the first switch unit 21 is connected to the control unit 50 through the interface S3, a second end of the first switch unit 21 is connected to a first end of the second switch unit 22, a second end of the second switch unit 22 is connected to a second end of the boost module 10, and a third end of the second switch unit 22 is connected to a first end of the second switch module 30. The first end of the first switch unit 21 is a third end of the first switch module 20, the second end of the second switch unit 22 is a first end of the first switch module 20, and the third end of the second switch unit 22 is a second end of the first switch module 20.

Specifically, the first control signal output by the control unit 50 is input to the first switch unit 21 through the interface S3, and the first switch unit 21 can be controlled to be turned on or off. The second switching unit 22 is turned on or off according to the turning on or off of the first switching unit 21 to establish or break the connection between the boosting module 10 and the second switching module 30.

In one embodiment, the first switch unit 21 includes a second switch transistor Q2, a third resistor R3, a fourth resistor R4, and a second capacitor C2. A first end of the second switch tube Q2 is connected to a first end of the third resistor R3, a second end of the third resistor R3 is connected to the second power source V2 and a first end of the second capacitor C2, a second end of the second capacitor C2 is grounded to GND, a second end of the second switch tube Q2 is connected to a first end of the fourth resistor R4, a second end of the fourth resistor R4 is connected to the control unit 50, and a third end of the second switch tube Q2 is connected to the second switch unit 22. The second switching tube Q2 is exemplified by a P-type transistor.

In one embodiment, the second switch unit 22 includes a third switch transistor Q3 and a fifth resistor R5. A first end of the third switching tube Q3 is connected to the second end of the first switching unit 21 and the first end of the fifth resistor R5, a second end of the third switching tube Q3 is connected to the second end of the fifth resistor R5 and the second end of the boost module 10, and a third end of the third switching tube Q3 is connected to the first end of the second switching module 30. The third switching tube Q3 is an N-type transistor, for example.

Specifically, when the first control signal is a low signal, the second terminal of the second switch Q2 is at a low level. The first terminal of the second switch Q2 is connected to the second power source V2 through the R3, and the first terminal of the second switch Q2 is at a high level. The second switch Q2 is turned on by a potential difference between the first terminal and the second terminal of the second switch Q2. Then, the first terminal of the third switch Q3 is grounded through the third terminal and the second terminal of the second switch Q2, and the first terminal of the third switch Q3 is forced to be pulled low. The second terminal of the third switching tube Q3 is inputted with the first voltage. A voltage difference exists between the first terminal and the second terminal of the third switching tube Q3, so that the third switching tube Q3 is turned on. In this case, a connection is established between the second terminal of the boost module 10 and the first terminal of the second switch module 20. In one embodiment, the power of the control unit 50 may be the second power V2, and the second power V2 may be 3.3V or 5V.

On the contrary, when the first control signal is a high level signal, the potential difference between the first end and the second end of the second switch Q2 is small and smaller than the on-state voltage of the second switch Q2, and the second switch Q2 is turned off. Then, the third switching tube Q3 is also turned off. In this case, the connection of the second terminal of the boosting module 10 and the first terminal of the second switching module 20 is disconnected.

In one embodiment, the second switch module 30 includes a fourth switch Q4, a second diode D2, a sixth resistor R6, and a seventh resistor R7. A first end of the fourth switching tube Q4 is connected to first ends of a sixth resistor R6 and a seventh resistor R7, a second end of the sixth resistor R6 is connected to a cathode of a second diode D2, an anode of the second diode D2 is connected to a second end of the first switching module 20, a second end of the seventh resistor R7 is connected to a second end of the fourth switching tube Q4 and a first input end of the motor M1, and a third end of the fourth switching tube Q4 is connected to the first power source V1. In this embodiment, the fourth switching transistor Q4 is an NMOS transistor, for example.

Optionally, the motor driving circuit further includes a sixth switching tube Q6 and a twelfth resistor R12. A first end of the sixth switching tube Q6 is connected to the first end of the twelfth resistor R12 and the second end of the first switching module 20, a second end of the sixth switching tube Q6 is connected to the fourth end of the second switching module 30 (i.e., the first end of the fourth switching tube Q4), and a third end of the sixth switching tube Q6 is connected to the second end of the twelfth resistor R12 and the third end of the second switching module 30 (i.e., the second end of the fourth switching tube Q4). In this embodiment, the sixth switching tube Q6 is an N-type switching tube, for example.

Specifically, when the third transistor Q3 is turned on and the first voltage is at a high level, the fourth transistor Q4 is turned on. The first power V1 is transmitted from the third terminal of the fourth switch Q4 to the second terminal and the first input terminal of the motor M1. The first power source V1 serves as a driving power source of the motor M1. When the third switching tube Q3 is turned off, the fourth switching tube Q4 is turned off, and the sixth switching tube Q6 is turned on. The connection between the first power source V1 and the motor M1 is disconnected. In one embodiment, the voltage of the first power V1 may be a power supply provided by a lithium battery, and the first power V1 may be 18VDC, 36VDC, 42VDC, or the like.

It can be understood that after the fourth switch Q4 is turned on, if the tube voltage drop of the fourth switch Q4 is neglected, the voltage at the second end of the fourth switch Q4 is raised to the voltage of the first power source V1. In order to maintain the conduction of the fourth switching transistor Q4, the first voltage needs to be set to be greater than the voltage of the first power source V1.

Meanwhile, when the fourth switching tube Q4 is turned off, because the junction capacitor is arranged inside the fourth switching tube Q4, and the voltage at the two ends of the fourth switching tube Q4 cannot suddenly change, by arranging the sixth switching tube Q6 and turning on the sixth switching tube Q6, the voltage of the junction capacitor can be consumed as soon as possible by using the sixth switching tube Q6, so that the fourth switching tube Q4 is turned off quickly.

In one embodiment, the third switching module 40 includes a fifth switch Q5, an eighth resistor R8, and a ninth resistor R9. A first end of the fifth switching tube Q5 is connected to a first end of the eighth resistor R8 and a first end of the ninth resistor R9, a second end of the eighth resistor R8 is connected to the control unit 50 through the interface S4, a second end of the fifth switching tube Q5 and a second end of the ninth resistor R9 are both grounded to GND, and a third end of the fifth switching tube Q5 is connected to a second input terminal of the motor M1. In this embodiment, the fifth switch Q5 is an NMOS transistor, for example.

The fifth switch Q5 is controlled by the control unit 50, and a second control signal output by the control unit 50 is transmitted to the fifth switch Q5 through the interface S4 to control the on/off of the fifth switch Q5. When the second control signal is at a high level, the fifth switch Q5 is turned on, and the second input terminal of the motor M1 is connected to the ground GND. When the second control signal is at a low level, the fifth switching tube Q5 is turned off, and the connection between the second input terminal of the motor M1 and the ground GND is broken.

In the embodiment of the present application, to drive the motor M1 to operate, the control unit 50 controls the second switching tube Q2 to be turned on by the first control signal, and then the third switching tube Q3 is turned on. Then, the first voltage is input to the fourth switching tube Q4 through the third switching tube Q3, so that the fourth switching tube Q4 is turned on. A connection is established between a first power source V1 and a first input of motor M1. At the same time, the control unit 50 should also control the fifth switching tube Q5 to be turned on by the second control signal to establish the connection between the second input terminal of the motor M1 and the ground GND. Thus, a loop is formed from the first power source V1 to the motor M1 to the ground GND, and the motor M1 operates.

On the contrary, if the motor M1 is to be stopped, the control unit 50 may control the second switching tube Q2 to be disconnected by the first control signal, and then the third switching tube Q3 is disconnected from the fourth switching tube Q4. Meanwhile, the control unit 50 also controls the fifth switching tube Q5 to be opened by the second control signal to disconnect the second input terminal of the motor M1 from the ground GND. Thus, the motor M1 loses the input operating power, and the motor M1 stops operating.

In this embodiment, the driving motor operation or the stopping motor operation can be realized by using two NMOS transistors. Compared with the mode of adopting a mechanical switch in the prior art, on one hand, the NMOS tube allows the flowing current to be relatively large, the applicable application scenes are more, the applicability is strong, on the other hand, the price of the NMOS tube is low, and the cost can be reduced. In addition, for the NMOS tube and the PMOS tube which can flow the same current, the price of the PMOS tube is more expensive than that of the NMOS tube, and the practicability of the motor driving circuit can be improved by adopting the common and cheaper NMOS tube. Meanwhile, two NMOS tubes are adopted to drive the motor, when the motor needs to be stopped to operate, when one NMOS tube is abnormal, the other NMOS tube can also normally disconnect a loop of the motor which is electrified, so that the motor is stopped to operate, and the stable and normal operation of a motor driving circuit is facilitated.

The embodiment of the application also provides electric equipment which comprises a motor and the motor driving circuit in any embodiment. The motor driving circuit is used for driving a motor.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the context of the present application, where technical features in the above embodiments or in different embodiments can also be combined, the steps can be implemented in any order and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A motor drive circuit, comprising:

the boost control circuit comprises a control unit, a boost module, a first switch module, a second switch module and a third switch module;

the first end of the boosting module is connected with the control unit, and the boosting module is used for boosting the voltage output by the control unit and outputting a first voltage;

the first end of the first switch module is connected with the second end of the boosting module, the second end of the first switch module is connected with the first end of the second switch module, the third end of the first switch module is connected with the control unit, and the first switch module is used for being switched on or off according to a first control signal output by the control unit so as to establish or disconnect the connection between the second end of the boosting module and the first end of the second switch module;

the second end of the second switch module is connected with a first power supply, the third end of the second switch module is respectively connected with the third end of the boosting module and the first input end of the motor, and the second switch module is used for being switched on or off according to the first voltage so as to establish or disconnect the connection between the first power supply and the first input end of the motor;

the first end of the third switch module is connected with the control unit, the second end of the third switch module is grounded, the third end of the third switch module is connected with the second input end of the motor, and the third switch module is used for being switched on or switched off according to a second control signal output by the control unit so as to establish or disconnect the connection between the second input end of the motor and the ground.

2. The motor drive circuit according to claim 1,

the boosting module comprises a first inductor, a first diode, a first capacitor, a first resistor, a second resistor, a first switching tube and a first voltage stabilizing diode;

the first end of the first inductor is connected with the control unit, the second end of the first inductor is connected with the third end of the first switch tube and the anode of the first diode, the cathode of the first diode is connected with the first end of the first capacitor, the cathode of the first voltage stabilizing diode and the first end of the first switch module, the second end of the first capacitor is connected with the anode of the first voltage stabilizing diode and the third end of the second switch module, the first end of the first switch tube is connected with the first end of the first resistor and the first end of the second resistor, the second end of the first resistor is connected with the control unit, and the second end of the first switch tube and the second end of the second resistor are both grounded.

3. The motor drive circuit according to claim 1,

the first switch module comprises a first switch unit and a second switch unit;

the first end of the first switch unit is connected with the control unit, the second end of the first switch unit is connected with the first end of the second switch unit, the second end of the second switch unit is connected with the second end of the boosting module, and the third end of the second switch unit is connected with the first end of the second switch module;

the first switch unit is used for switching on or off according to the first control signal;

the second switch unit is used for being switched on or off according to the switching on or off of the first switch unit so as to establish or disconnect the connection between the second end of the boosting module and the first end of the second switch module;

the first end of the first switch unit is the third end of the first switch module, the second end of the second switch unit is the first end of the first switch module, and the third end of the second switch unit is the second end of the first switch module.

4. The motor drive circuit according to claim 3,

the first switch unit comprises a second switch tube, a third resistor, a fourth resistor and a second capacitor;

the first end of the second switch tube is connected with the first end of the third resistor, the second end of the third resistor is connected with the second power supply and the first end of the second capacitor, the second end of the second capacitor is grounded, the second end of the second switch tube is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the control unit, and the third end of the second switch tube is connected with the second switch unit.

5. The motor drive circuit according to claim 3,

the second switch unit comprises a third switch tube and a fifth resistor;

the first end of the third switching tube is connected with the second end of the first switching unit and the first end of the fifth resistor, the second end of the third switching tube is connected with the second end of the fifth resistor and the second end of the boosting module, and the third end of the third switching tube is connected with the first end of the second switching module.

6. The motor drive circuit according to claim 1,

the second switch module comprises a fourth switch tube, a second diode, a sixth resistor and a seventh resistor;

the first end of fourth switch tube with the sixth resistance and the first end of seventh resistance is connected, the second end of sixth resistance with the negative pole of second diode is connected, the positive pole of second diode with the second end of first switch module is connected, the second end of seventh resistance with the second end of fourth switch tube and the first input of motor is connected, the third end of fourth switch tube with first power is connected.

7. The motor drive circuit according to claim 1,

the third switch module comprises a fifth switch tube, an eighth resistor and a ninth resistor;

the first end of the fifth switching tube is connected with the first end of the eighth resistor and the first end of the ninth resistor, the second end of the eighth resistor is connected with the control unit, the second end of the fifth switching tube is grounded with the second end of the ninth resistor, and the third end of the fifth switching tube is connected with the second input end of the motor.

8. The motor drive circuit according to claim 1,

the motor driving circuit further comprises a tenth resistor and an eleventh resistor which are connected in series;

the first end of a resistor branch circuit formed by connecting a tenth resistor and an eleventh resistor in series is connected with the second end of the boosting module, the second end of the resistor branch circuit is grounded, and the midpoint of the resistor branch circuit is connected with the control unit.

9. The motor drive circuit according to claim 1,

the motor driving circuit also comprises a sixth switching tube and a twelfth resistor;

the first end of the sixth switching tube is connected with the first end of the twelfth resistor and the second end of the first switching module, the second end of the sixth switching tube is connected with the fourth end of the second switching module, and the third end of the sixth switching tube is connected with the second end of the twelfth resistor and the third end of the second switching module.

10. An electric appliance comprising a motor and a motor drive circuit according to any one of claims 1 to 9;

the motor driving circuit is used for driving the motor.

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