Motor driving circuit, motor and water toothbrush

Abstract

The utility model relates to a motor driving circuit, a motor and a water toothbrush, and belongs to the technical field of oral care instruments. The motor driving circuit comprises a voltage stabilizing circuit and a driving circuit; the voltage stabilizing circuit is provided with a first power supply end and a first output end, and the first power supply end is used for being connected with a power supply; the driving circuit is provided with a second power supply end and a load end, the second power supply end is electrically connected with the first output end, and the load end is used for being connected with a motor. By the adoption of the water toothbrush, the motor of the water toothbrush can work under the stable voltage, so that it is ensured that the power of high-pressure water flow output by the water toothbrush is constant, and the product experience of a user is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of oral care appliances, and in particular to a motor drive circuit, a motor and a water toothbrush. Background Art

[0002] As the quality of life improves, people pay more and more attention to oral hygiene, and the use of electric water toothbrushes is becoming more and more popular.

[0003] The working principle of the water toothbrush is mainly to use the battery as the motor function. The motor drives the pump body to rotate to form a high-pressure water flow, which is used to rinse the adjacent gaps between the teeth to achieve the effect of cleaning the oral cavity.

[0004] However, as the water toothbrush is used, the battery voltage will gradually decrease, causing the high-pressure water flow output by the water toothbrush to be insufficient, affecting the user's product experience. Utility Model Content

[0005] The embodiments of the present disclosure provide a motor drive circuit, a motor and a water toothbrush, which can solve the technical problems existing in the related technologies. The technical solutions are as follows:

[0006] In a first aspect, an embodiment of the present disclosure provides a motor drive circuit, the motor drive circuit comprising a voltage stabilizing circuit and a drive circuit;

[0007] The voltage stabilizing circuit has a first power supply terminal and a first output terminal, wherein the first power supply terminal is used to connect to a power supply;

[0008] The driving circuit has a second power supply end and a load end, the second power supply end is electrically connected to the first output end, and the load end is used to connect to the motor.

[0009] In a possible implementation, the voltage stabilizing circuit comprises a first boosting resistor, a second boosting resistor and a boosting unit;

[0010] The first end of the first boost resistor is grounded;

[0011] The first end of the second boost resistor is electrically connected to one end of the second end of the first boost resistor, and the second end of the second boost resistor is electrically connected to the first output end;

[0012] The power input terminal of the boost unit is electrically connected to the first power terminal, and the feedback terminal of the boost unit is electrically connected to the second terminal of the first boost resistor and the first terminal of the second boost resistor respectively.

[0013] In a possible implementation, the feedback voltage of the boost unit is 0.6V, the resistance value of the first boost resistor is 56kΩ, and the resistance value of the second boost resistor is 1MΩ.

[0014] In a possible implementation, the voltage stabilization circuit has a first filter capacitor, a first end of the first filter capacitor is electrically connected to the first power supply end, and a second end of the first filter capacitor is grounded.

[0015] In a possible implementation, the motor drive circuit further includes a current detection circuit, a sampling resistor, a control switch and a controller;

[0016] The current detection circuit has a second input terminal and a second output terminal;

[0017] The first end of the sampling resistor is electrically connected to the ground end of the driving circuit and the second input end respectively, and the second end of the sampling resistor is grounded;

[0018] The control switch has a control end and two connection ends, and the two connection ends are electrically connected to the first power end and the power supply respectively;

[0019] The controller is electrically connected to the second output end and the control end;

[0020] The current detection circuit is used to detect the current flowing through the sampling resistor and send the current to the controller. The controller is used to control the control switch to be disconnected when the current is greater than a current threshold.

[0021] In a possible implementation, the current detection circuit has an operational amplifier;

[0022] The positive input terminal of the operational amplifier is connected to the second input terminal, and the output terminal of the operational amplifier is electrically connected to the controller.

[0023] In a possible implementation, the operational amplifier has a feedback resistor and an input resistor, the feedback resistor has a resistance of 417 kΩ, and the input resistor has a resistance of 100 kΩ;

[0024] The first end of the feedback resistor is electrically connected to the output end, and the second end of the feedback resistor is electrically connected to the reverse input end of the operational amplifier;

[0025] The first end of the input resistor is electrically connected to the reverse input end, and the second end of the feedback resistor is grounded.

[0026] In a possible implementation manner, the resistance of the sampling resistor is 0.02Ω.

[0027] In a second aspect, an embodiment of the present disclosure provides a motor, which includes the motor drive circuit in the first aspect and possible implementations thereof.

[0028] In a third aspect, an embodiment of the present disclosure provides a water toothbrush, which includes the motor in the second aspect and possible implementations thereof.

[0029] The technical solution provided by the embodiments of the present disclosure includes at least the following beneficial effects:

[0030] The disclosed embodiment provides a motor drive circuit, in which a voltage stabilizing circuit has a first power supply terminal and a first output terminal, the first power supply terminal is used to connect to a power supply, and the drive circuit has a second power supply terminal and a load terminal, the second power supply terminal is electrically connected to the first output terminal, and the load terminal is used to connect to a motor. In this way, the power supply is connected to the first power supply terminal of the voltage stabilizing circuit, and after adjustment by the voltage stabilizing circuit, the first output terminal outputs a stable voltage to the second power supply terminal, the motor is connected to the load terminal, and the load terminal outputs a stable voltage to the motor, so that the motor works under the stable voltage, thereby ensuring that the power of the high-pressure water flow output by the water toothbrush is constant, thereby improving the user's product experience.

[0031] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 is a structural schematic diagram of a motor drive circuit shown in an embodiment of the present disclosure;

[0034] Figure 2 is a structural schematic diagram of a motor drive circuit shown in an embodiment of the present disclosure;

[0035] Figure 3 is a structural schematic diagram of a motor drive circuit shown in an embodiment of the present disclosure;

[0036] Figure 4 It is a structural schematic diagram of a motor drive circuit shown in an embodiment of the present disclosure.

[0037] Legend

[0038] 1. Voltage stabilizing circuit;

[0039] 11. First power supply terminal; 12. First output terminal; 13. First boost resistor; 14. Second boost resistor; 15. Boost unit; 16. First filter capacitor;

[0040] 13a, a first end of a first boosting resistor; 13b, a second end of the first boosting resistor;

[0041] 14a, a first end of a second boost resistor; 14b, a second end of a second boost resistor;

[0042] 15a, power input terminal; 15b, feedback terminal;

[0043] 16a, a first end of a first filter capacitor; 16b, a second end of the first filter capacitor;

[0044] 151. Current mode boost DC-DC converter chip; 152. First inductor; 153. First diode; 154. First capacitor; 155. Second capacitor;

[0045] 2. Driving circuit;

[0046] 21. Second power supply terminal; 22. Load terminal; 23. Signal control terminal; 24. Motor drive chip; 25. Second filter capacitor; 26. Freewheeling diode; 27. First resistor; 28. Pull-down resistor; 20. Ground terminal;

[0047] 221, a first load end; 222, a second load end;

[0048] 3. Current detection circuit;

[0049] 31. a second input terminal; 32. a second output terminal; 33. an operational amplifier;

[0050] 33a, positive input terminal; 33b, output terminal; 33c, negative input terminal;

[0051] 331, feedback resistance; 332, input resistance;

[0052] 331a, a first end of a feedback resistor; 331b, a second end of a feedback resistor;

[0053] 332a, a first end of an input resistor; 332b, a second end of an input resistor;

[0054] 4. Sampling resistor;

[0055] 4a, a first end of the sampling resistor; 4b, a second end of the sampling resistor;

[0056] 5. Control switch;

[0057] 51. Control terminal; 52. Connection terminal;

[0058] 6. Controller. DETAILED DESCRIPTION

[0059] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0060] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent disclosure specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0061] The present disclosure provides a motor drive circuit. Figure 1 As shown, the motor driving circuit includes a voltage stabilizing circuit 1 and a driving circuit 2.

[0062] Among them, the voltage stabilizing circuit 1 has a first power supply terminal 11 and a first output terminal 12, the first power supply terminal 11 is used to connect to the power supply, the driving circuit 2 has a second power supply terminal 21 and a load terminal 22, the second power supply terminal 21 is electrically connected to the first output terminal 12, and the load terminal 22 is used to connect to the motor.

[0063] In this way, the power supply is connected to the first power terminal 11 of the voltage stabilizing circuit 1, and after adjustment by the voltage stabilizing circuit 1, the first output terminal 12 outputs a stable voltage to the second power terminal 21, the motor is connected to the load terminal 22, and the load terminal 22 outputs a stable voltage to the motor, so that the motor works under the stable voltage, thereby ensuring that the power of the high-pressure water flow output by the water toothbrush is constant, thereby improving the user's product experience.

[0064] In a possible implementation, the voltage stabilizing circuit 1 and the driving circuit 2 are integrated on a printed circuit board, so as to reduce the difficulty of processing the motor driving circuit and improve the integration of the motor driving circuit.

[0065] Below, each part of the motor drive circuit is introduced separately:

[0066] 1. Voltage stabilizing circuit 1

[0067] The voltage stabilizing circuit 1 is a part of the motor driving circuit for outputting a stable voltage.

[0068] like Figure 2 As shown, the voltage stabilizing circuit 1 has a first power supply terminal 11 and a first output terminal 12, a first boosting resistor 13, a second boosting resistor 14 and a boosting unit 15. The first power supply terminal 11 is used to connect to the positive electrode of the power supply, the first end 13a of the first boosting resistor 13 is grounded, the first end 14a of the second boosting resistor 14 is electrically connected to one end of the second end 13b of the first boosting resistor 13, the second end 14b of the second boosting resistor 14 is electrically connected to the first output terminal 12, the power input terminal 15a of the boosting unit 15 is electrically connected to the first power supply terminal 11, and the feedback terminal 15b of the boosting unit 15 is electrically connected to the second end 13b of the first boosting resistor 13 and the first end 14a of the second boosting resistor 14, respectively.

[0069] In a possible implementation, the boost unit 15 includes a current-mode boost DC-DC converter chip 151 , a first inductor 152 , a first diode 153 , a first capacitor 154 , and a second capacitor 155 .

[0070] like Figure 2 As shown, one end of the first inductor 152 is electrically connected to the first power supply terminal 11, and the other end is electrically connected to the switch output terminal of the current mode boost DC-DC converter chip 151. The anode of the first diode 153 is electrically connected to the other end of the first inductor 152, and the cathode of the first diode 153 is electrically connected to the first output terminal 12. One end of the first capacitor 154 and the second capacitor 155 are electrically connected to the cathode of the first diode 153, respectively, and the other ends of the first capacitor 154 and the second capacitor 155 are grounded, respectively.

[0071] In implementation, the first power supply terminal 11 is electrically connected to the positive pole of the power supply, the negative pole of the power supply is grounded, the power input terminal 15a of the current mode boost DC-DC converter chip 151 is electrically connected to the first power supply terminal 11, and the power input terminal 15a is equal to the positive pole of the power supply. The current mode boost DC-DC converter chip 151 is equivalent to having a switch tube inside, and the current mode boost DC-DC converter chip 151 controls the switch tube to be turned on or off with a certain duty cycle. At the beginning of the working cycle, the switch tube is in the on state, the first inductor 152 stores energy, and the current on the first inductor 152 gradually increases. When the switch tube is turned on, the energy stored in the first inductor 152 increases with the increase of current. At the same time, the first diode 153 is reversely biased relative to the first inductor 152 to prevent the current in the first inductor 152 from flowing in reverse. When the switch tube is turned off, the energy stored in the first inductor 152 cannot continue to increase, and the current on the first inductor 152 cannot disappear immediately, so the first inductor 152 releases energy to the first output terminal 12. At this time, the first diode 153 is turned on to maintain the closed loop of the circuit. By controlling the duty cycle of the current mode boost DC-DC converter chip 151, as well as the parameters of the first inductor 152, the first capacitor 154, the second capacitor 155, the first boost resistor 13 and the second boost resistor 14, the voltage input from the first power supply terminal 11 can be boosted to the required output voltage of the first output terminal 12.

[0072] In one example, the model of the current mode boost DC-DC converter chip 151 is TC6291, and its feedback voltage is 0.6V, the first resistance R1 of the first boost resistor 13 is 56kΩ, the second resistance R2 of the second boost resistor 14 is 1MΩ, the inductance of the first inductor 152 is 4.7μH (microhenry), and the capacitance of the first capacitor 154 and the second capacitor 155 are both 10μF (microfarad). The output voltage of the first output terminal 12 is Vout=0.6V(1+R2 / R1)=11.3V, which is equal to the potential of the second power supply terminal 21 of the drive circuit 2, that is, the motor operates at a stable voltage of 11.3V. In this way, the power of the high-pressure water flow output by the water toothbrush can be ensured to be constant, thereby improving the user's product experience.

[0073] In a possible implementation, the voltage stabilizing circuit 1 has a first filter capacitor 16 .

[0074] like Figure 2 As shown, the voltage stabilizing circuit 1 has a first filter capacitor 16, a first end 16a of the first filter capacitor 16 is electrically connected to the first power supply terminal 11, and a second end 16b of the first filter capacitor 16 is grounded. In this way, when the voltage value of the first power supply terminal 11 changes rapidly, the first filter capacitor 16 can delay the change trend of the voltage value, so that the voltage stabilizing circuit remains relatively stable.

[0075] 2. Driving circuit 2

[0076] The drive circuit 2 is a component in the motor drive circuit used to control whether the motor is connected to the circuit.

[0077] like Figure 1 As shown, the drive circuit 2 has a second power supply terminal 21 and a load terminal 22, the second power supply terminal 21 is electrically connected to the first output terminal 12, and the load terminal 22 is used to connect to the motor. The load terminal 22 includes a first load terminal 221 and a second load terminal 222, and the first load terminal 221 is electrically connected to the second power supply terminal 21.

[0078] In implementation, the first load terminal 221 is used to be electrically connected to the positive pole of the motor, and the second load terminal 222 is used to be electrically connected to the negative pole of the motor, so as to connect the motor to the drive circuit 2. When the second load terminal 222 is grounded, the second power supply terminal 21, the first load terminal 221, the second load terminal 222 to the ground terminal form a closed loop, and the motor is powered on to work. Correspondingly, when the second load terminal 222 is not grounded, the second power supply terminal 21, the first load terminal 221, the second load terminal 222 to the ground terminal cannot form a closed loop, and the motor is powered off and is in a non-working state.

[0079] It can be understood that the input voltage of the second power supply terminal 21 is a stable voltage after being adjusted by the voltage stabilizing circuit 1 , and therefore, the voltage between the first load terminal 221 and the second load terminal 222 is stable.

[0080] In a possible implementation, the drive circuit 2 has a signal control terminal 23, a motor drive chip 24, a second filter capacitor 25 and a freewheeling diode 26. Figure 2 As shown, one end of the second filter capacitor 25 is electrically connected to the second power supply terminal 21, the other end of the second filter capacitor 25 is electrically connected to the second load terminal 222, the cathode of the flyback diode 26 is electrically connected to the second power supply terminal 21, and the anode of the flyback diode 26 is connected to the second load terminal 222. In this way, by setting the second filter capacitor 25, when the voltage value of the second power supply terminal 21 changes rapidly, the second filter capacitor 25 can delay the change trend of the voltage value, so that the drive circuit remains relatively stable. By setting the flyback diode 26, the energy of the coil in the motor can be released when the power is off to prevent the coil from burning out, and at the same time, the unidirectional flow of the current can be ensured.

[0081] In one example, the model of the motor driving chip 24 is FS8205, which is a dual switch tube. Pins 4 and 6 of the motor driving chip 24 are electrically connected to the signal control terminal 23, respectively, pins 2 and 5 of the motor driving chip 24 are electrically connected to the second load terminal 222, respectively, and pins 1 and 3 of the motor driving chip 24 are grounded, respectively.

[0082] In implementation, the signal control terminal 23 sends a high level or a low level to pins 4 and 6 of the motor drive chip 24. When the signal control terminal 23 sends a high level to pins 4 and 6 of the motor drive chip 24, pin 4 controls pin 2 to be connected to pin 1, and pin 6 controls pin 5 to be connected to pin 3, so that the second load terminal 222 is grounded, and the motor is powered on and works. When the signal control terminal 23 sends a low level to pins 4 and 6 of the motor drive chip 24, pin 4 controls pin 2 to be disconnected from pin 1, and pin 6 controls pin 5 to be disconnected from pin 3, so that the second load terminal 222 is not grounded, and the motor is powered off and is in a non-working state.

[0083] In an example, the driving circuit 2 has a first resistor 27 and a pull-down resistor 28 .

[0084] like Figure 2 As shown, the driving circuit 2 has a first resistor 27 and a pull-down resistor 28. The two ends of the first resistor 27 are electrically connected to the signal control terminal 23 and the second load terminal 222 respectively. One end of the pull-down resistor 28 is electrically connected to the second load terminal 222, and the other end is grounded. The resistance of the pull-down resistor 28 is much greater than the resistance of the first resistor.

[0085] Exemplarily, the resistance of the first resistor 27 is 10Ω, and the resistance of the pull-down resistor 28 is 10 kΩ.

[0086] In this way, setting the pull-down resistor 28 can ensure that the level value sent by the signal control terminal 23 to the pins 4 and 6 of the motor driving chip 24 is stable.

[0087] In some possible implementations, the motor drive circuit also has an overload protection function.

[0088] During the use of the water toothbrush, there may be foreign matter blocking the water outlet, causing the motor to stall. On the one hand, when the motor is stalled, the motor will try to continue to rotate, but due to the obstruction, it cannot reach the expected speed. In order to overcome this resistance, the motor will consume more current. This will cause the current load of the motor to increase sharply, which may exceed its rated load, causing the motor and circuit to overload. On the other hand, a continuous stalled state will cause a lot of heat to be generated inside the motor, which may cause damage to the windings or insulation materials. Long-term stalled operation may cause the components inside the motor to overheat, causing the motor to burn out.

[0089] like Figure 3As shown, the motor drive circuit also includes a current detection circuit 3, a sampling resistor 4, a control switch 5 and a controller 6. The current detection circuit 3 has a second input terminal 31 and a second output terminal 32. The first end 4a of the sampling resistor 4 is electrically connected to the ground terminal 20 and the second input terminal 31 of the drive circuit 2, respectively, and the second end 4b of the sampling resistor 4 is grounded. The control switch 5 has a control terminal 51 and two connection terminals 52, and the two connection terminals 52 are electrically connected to the first power supply terminal 11 and the power supply, respectively. The controller 6 is electrically connected to the second output terminal 32 and the control terminal 51.

[0090] The current detection circuit 3 is used to detect the current flowing through the sampling resistor 4 and send the current to the controller 6. The controller 6 is used to control the control switch 5 to be disconnected when the current is greater than the current threshold.

[0091] In this way, when the water toothbrush encounters a situation where the water outlet is blocked by debris, the current in the motor increases, and the current detection circuit 3 can detect the current flowing through the sampling resistor 4 (that is, the current value flowing through the motor). When the current is greater than the current threshold, the controller 6 controls the control switch 5 to disconnect, so that the power supply is disconnected from the first power supply terminal 11, and the motor power supply does not output voltage to the motor drive circuit, thereby preventing the motor from being burned out by excessive current.

[0092] In one example, the control switch 5 is a triode, and the controller 6 is used to receive the current sent by the current detection circuit 3. When the current is less than the current threshold, a high level is sent to the control terminal 51 of the control switch 5, so that the two connection terminals 52 of the control switch 5 are turned on. When the current is greater than or equal to the current threshold, a low level is sent to the control terminal 51 of the control switch 5, so that the two connection terminals 52 of the control switch 5 are disconnected, so that the battery stops supplying power to the motor drive circuit to prevent the motor from burning out.

[0093] In one example, by consulting the motor specification, it is known that the current of the motor in a stalled state is 4A (ampere), and the current of the motor in a normal working state is 1.9A. The above current threshold can be set in the range of [3A, 3.5A].

[0094] Exemplarily, the current threshold is 3.5A.

[0095] In some possible implementations, the current detection circuit 3 has an operational amplifier 33 .

[0096] like Figure 4As shown, the positive input terminal 33a of the operational amplifier 33 is connected to the second input terminal 31, and the output terminal 33b of the operational amplifier 33 is electrically connected to the controller 6. The operational amplifier 33 is arranged in the current detection circuit 3, which can reduce the resistance value of the sampling resistor 4 and reduce the voltage division effect of the sampling resistor 4, so that a larger voltage value exists between the first load terminal 221 and the second load terminal 22.

[0097] By way of example, the operational amplifier 33 is of model LMV321.

[0098] In one example, the operational amplifier 33 has a feedback resistor 331 and an input resistor 332 .

[0099] like Figure 4 As shown, the first end 331a of the feedback resistor 331 is electrically connected to the output end 33b, and the second end 331b of the feedback resistor 331 is electrically connected to the inverting input end 33c of the operational amplifier 33. The first end 332a of the input resistor 332 is electrically connected to the inverting input end 33c, and the second end 332b of the feedback resistor 331 is grounded.

[0100] Exemplarily, the third resistance R3 of the feedback resistor 331 is 417 kΩ, the fourth resistance R4 of the input resistor 332 is 100 kΩ, and the fifth resistance R5 of the sampling resistor 4 is 0.02 Ω. According to the amplification factor calculation formula A=(1+R3 / R4)=5.17, it can be seen that the amplification factor of the operational amplifier 33 is 5.17.

[0101] The disclosed embodiment provides a motor drive circuit, in which a voltage stabilizing circuit 1 has a first power supply terminal 11 and a first output terminal 12, the first power supply terminal 11 is used to connect to a power supply, and a drive circuit 2 has a second power supply terminal 21 and a load terminal 22, the second power supply terminal 21 is electrically connected to the first output terminal 12, and the load terminal 22 is used to connect to a motor. In this way, the power supply is connected to the first power supply terminal 11 of the voltage stabilizing circuit 1, and after adjustment by the voltage stabilizing circuit 1, the first output terminal 12 outputs a stable voltage to the second power supply terminal 21, and the motor is connected to the load terminal 22, and the load terminal 22 outputs a stable voltage to the motor, so that the motor works under the stable voltage, thereby ensuring that the power of the high-pressure water flow output by the water toothbrush is constant, thereby improving the user's product experience.

[0102] Based on the same concept, an embodiment of the present disclosure provides a motor, which includes the above-mentioned motor driving circuit.

[0103] Based on the same concept, an embodiment of the present disclosure provides a water toothbrush comprising the above-mentioned motor.

[0104] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A motor drive circuit, characterized in that: The motor drive circuit comprises a voltage stabilizing circuit (1) and a drive circuit (2); The voltage stabilizing circuit (1) comprises a first power supply terminal (11) and a first output terminal (12), wherein the first power supply terminal (11) is used to connect to a power supply; The drive circuit (2) comprises a second power supply terminal (21) and a load terminal (22); the second power supply terminal (21) is electrically connected to the first output terminal (12); and the load terminal (22) is used to connect to a motor.

2. The motor drive circuit according to claim 1, characterized in that: The voltage stabilizing circuit (1) comprises a first voltage boosting resistor (13), a second voltage boosting resistor (14) and a voltage boosting unit (15); The first end (13a) of the first boosting resistor (13) is grounded; The first end (14a) of the second boost resistor (14) is electrically connected to one end of the second end (13b) of the first boost resistor (13), and the second end (14b) of the second boost resistor (14) is electrically connected to the first output end (12); The power input terminal (15a) of the boost unit (15) is electrically connected to the first power terminal (11), and the feedback terminal (15b) of the boost unit (15) is electrically connected to the second terminal (13b) of the first boost resistor (13) and the first terminal (14a) of the second boost resistor (14), respectively.

3. The motor drive circuit according to claim 2, characterized in that: The feedback voltage of the boost unit (15) is 0.6V, the first resistance R1 of the first boost resistor (13) is 56kΩ, and the second resistance R2 of the second boost resistor (14) is 1MΩ.

4. The motor drive circuit according to claim 1, characterized in that: The voltage stabilizing circuit (1) comprises a first filter capacitor (16), a first end (16a) of the first filter capacitor (16) being electrically connected to the first power supply end (11), and a second end (16b) of the first filter capacitor (16) being grounded.

5. The motor drive circuit according to claim 1, characterized in that: The motor drive circuit also includes a current detection circuit (3), a sampling resistor (4), a control switch (5) and a controller (6); The current detection circuit (3) has a second input terminal (31) and a second output terminal (32); The first end (4a) of the sampling resistor (4) is electrically connected to the ground end (20) of the drive circuit (2) and the second input end (31), respectively, and the second end (4b) of the sampling resistor (4) is grounded; The control switch (5) has a control end (51) and two connection ends (52), and the two connection ends (52) are electrically connected to the first power end (11) and the power supply respectively; The controller (6) is electrically connected to the second output end (32) and the control end (51); The current detection circuit (3) is used to detect the current flowing through the sampling resistor (4) and send the current to the controller (6). The controller (6) is used to control the control switch (5) to be disconnected when the current is greater than a current threshold.

6. The motor drive circuit according to claim 5, characterized in that: The current detection circuit (3) has an operational amplifier (33); The positive input terminal (33a) of the operational amplifier (33) is connected to the second input terminal (31), and the output terminal (33b) of the operational amplifier (33) is electrically connected to the controller (6).

7. The motor drive circuit according to claim 6, characterized in that: The operational amplifier (33) has a feedback resistor (331) and an input resistor (332), a third resistance value R3 of the feedback resistor (331) is 417 kΩ, and a fourth resistance value R4 of the input resistor (332) is 100 kΩ; The first end (331a) of the feedback resistor (331) is electrically connected to the output end (33b), and the second end (331b) of the feedback resistor (331) is electrically connected to the reverse input end (33c) of the operational amplifier (33); The first end (332a) of the input resistor (332) is electrically connected to the reverse input end (33c), and the second end (332b) of the feedback resistor (331) is grounded.

8. The motor drive circuit according to claim 5, characterized in that: The fifth resistance R5 of the sampling resistor (4) is 0.02Ω.

9. A motor, characterized in that: The motor comprises the motor drive circuit according to any one of claims 1 to 8.

10. A water toothbrush, characterized in that: The water toothbrush comprises the motor as claimed in claim 9.

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