CN112600363A - Brushless direct current motor control circuit, brushless direct current motor and miniature water pump - Google Patents

Brushless direct current motor control circuit, brushless direct current motor and miniature water pump Download PDF

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Publication number
CN112600363A
CN112600363A CN202011433170.0A CN202011433170A CN112600363A CN 112600363 A CN112600363 A CN 112600363A CN 202011433170 A CN202011433170 A CN 202011433170A CN 112600363 A CN112600363 A CN 112600363A
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CN
China
Prior art keywords
switching device
brushless
coil
power supply
control circuit
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Pending
Application number
CN202011433170.0A
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Chinese (zh)
Inventor
陈金贵
姚钟红
温金福
陈昊
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Thermo Xiamen Intelligent Technology Co ltd
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Thermo Xiamen Intelligent Technology Co ltd
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Priority to CN202011433170.0A priority Critical patent/CN112600363A/en
Publication of CN112600363A publication Critical patent/CN112600363A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors

Abstract

Brushless DC motor control circuit, brushless DC motor and miniature pump. The brushless DC motor control circuit includes: the first end of the first coil is connected with a power supply; the first end of the second coil is connected with a power supply; the power supply end of the Hall sensor is connected with a power supply, and the power supply ground end of the Hall sensor is connected with a common ground; the input end of the first switching device is connected with the second end of the first coil, the output end of the first switching device is connected with a common ground, and the control end of the first switching device is connected with the signal output end of the Hall sensor; the input end of the second switching device is connected with the second end of the second coil, the output end of the second switching device is connected with the common ground, and the control end of the second switching device is connected with the input end of the first switching device. The brushless direct current motor control circuit has a simplified structure and reduces the cost.

Description

Brushless direct current motor control circuit, brushless direct current motor and miniature water pump
Technical Field
The invention relates to the field of brushless motors, in particular to a brushless direct current motor control circuit, a brushless direct current motor and a miniature water pump.
Background
The brushless direct current motor is a typical electromechanical integration product, has the performance of fast response, larger starting torque and capability of providing rated torque from zero rotating speed to rated rotating speed, and the motor performance is improved in the development of the prior art. The brushless direct current motor can be applied to miniature water pumps, automobiles, tools, industrial control, automation, aerospace and the like.
Most of the mainstream brushless direct current motor control schemes in the market at present are three-phase brushless direct current motor control schemes, namely three-phase belt program control, and the problems of complex control and high control cost exist.
For more pertinent content, reference may be made to chinese patent documents CN107769631A, CN103973047A and CN 203607945U.
Disclosure of Invention
The invention aims to provide a brushless direct current motor control circuit, a brushless direct current motor and a micro water pump so as to simplify the brushless direct current motor control circuit and the brushless direct current motor.
In order to solve the above problems, the present invention provides a brushless dc motor control circuit, comprising: the first end of the first coil is connected with a power supply; the first end of the second coil is connected with a power supply; the power supply end of the Hall sensor is connected with a power supply, and the power supply ground end of the Hall sensor is connected with a common ground; the input end of the first switching device is connected with the second end of the first coil, the output end of the first switching device is connected with a common ground, and the control end of the first switching device is connected with the signal output end of the Hall sensor; the input end of the second switching device is connected with the second end of the second coil, the output end of the second switching device is connected with the common ground, and the control end of the second switching device is connected with the input end of the first switching device.
Optionally, a capacitor is arranged between the power supply end and the output end of the hall sensor.
Optionally, a first resistor is arranged between the control terminal of the first switching device and the signal output terminal of the hall sensor, and a second resistor is arranged between the control terminal of the first switching device and a common ground; and a third resistor is arranged between the control terminal of the second switching device and the input terminal of the first switching device, and a fourth resistor is arranged between the control terminal of the second switching device and the common ground.
Optionally, the first switching device and the second switching device are both NMOS transistors.
Optionally, a transient voltage suppression diode is connected between the input end and the output end of the first switching device; a transient voltage suppression diode is connected between the input end and the output end of the second switching device; and a transient voltage suppression diode is connected between the power supply end and the power supply ground end of the Hall sensor.
Optionally, an anti-reverse-connection protection circuit is further provided between the power supply and the power supply end of the hall sensor, and between the first end of the first coil and the second end of the second coil.
Optionally, the reverse connection protection circuit includes a first voltage-dividing resistor, a second voltage-dividing resistor, and a third switching device, a control end of the third switching device is connected between the first voltage-dividing resistor and the second voltage-dividing resistor, an input end of the third switching device is connected to a power supply, and an output end of the third switching device is connected to a power supply end of the hall sensor, a first end of the first coil, and a second end of the second coil.
Optionally, the circuit further includes a dc-dc conversion circuit.
In order to solve the above problems, the present invention further provides a brushless dc motor, which includes a stator and a rotor, and further includes the above brushless dc motor control circuit.
Optionally, the hall sensor in the brushless dc motor control circuit is connected and fixed to the stator, and the hall sensor is located between the stator and the rotor.
In order to solve the problems, the invention also provides a miniature water pump which comprises the brushless direct current motor.
The brushless direct current motor control circuit has the beneficial effects that:
1. the brushless direct current motor control circuit is controlled by pure hardware, a microprocessing unit (MCU) such as a singlechip and the like is not needed to be controlled, a program is not needed to be developed, the research and development cost is low, and the brushless direct current motor control circuit is simplified;
2. the circuit is simple and easy to realize, and the material cost and the production cost are low;
3. the design of the corresponding motor is simple, the material is less, the cost is low, and the production efficiency is high;
4. the development period is short, and the production efficiency is high.
Drawings
FIG. 1 is a schematic diagram of a brushless DC motor control circuit in an embodiment;
FIG. 2 is a schematic diagram of a brushless DC motor control circuit in another embodiment;
FIG. 3 is a schematic diagram of a brushless DC motor control circuit in another embodiment;
FIG. 4 is a schematic diagram of a brushless DC motor control circuit in another embodiment;
FIG. 5 is a schematic structural diagram of a brushless DC motor according to an embodiment;
FIG. 6 is a perspective view of the micro-pump in this embodiment;
fig. 7 is a schematic bottom view of the micro-pump shown in fig. 6.
Detailed Description
The existing brushless direct current motor control circuit mainly has the following problems:
1. the control is complex, the MCU is required to be controlled by a program, and the research and development cost is high; if the program is not well designed, the startup and even the burn-in of the computer can be possibly caused;
2. the circuit matched with the MCU is relatively complex, the material cost is high, the production is complex, and therefore the production cost is high;
3. the motor is relatively complex in design, more in material, high in cost and low in production efficiency;
4. the development cycle is long and the efficiency is low.
Therefore, the invention provides a novel brushless direct current motor control circuit, a brushless direct current motor and a micro water pump, so as to solve the defects.
For a more clear presentation, the invention is described in detail below with reference to the accompanying drawings.
An embodiment of the present invention provides a control circuit of a brushless dc motor, please refer to fig. 1.
The brushless DC motor control circuit includes:
a first coil L1, a first end of the first coil L1 being connected to a power supply VCC;
a first end of the second coil L2, and a first end of the second coil L2 is connected with a power supply VCC;
the Hall sensor HALL1 is characterized in that a power supply end (end 1) of the Hall sensor HALL1 is connected with a power supply VCC, and a power supply ground end (end 2) of the Hall sensor HALL1 is connected with a common ground GND;
an input end (2 end) of the first switching device Q1 is connected with a second end of the first coil L1, an output end (3 end) of the first switching device Q1 is connected with a common ground GND, and a control end (1 end) of the first switching device Q1 is connected with a signal output end (3 end) of the Hall sensor HALL 1;
an input end (2 end) of the second switching device Q2, an output end (3 end) of the second switching device Q2 is connected with the second end of the second coil L2, an output end (3 end) of the second switching device Q2 is connected with the common ground GND, and a control end (1 end) of the second switching device Q2 is connected with the input end (2 end) of the first switching device Q1.
Referring to fig. 1, a capacitor C1 is provided between a power supply terminal (terminal 1) and a power ground terminal (terminal 2) of the HALL sensor HALL1, and a capacitor C1 is provided between the two terminals to perform voltage stabilization and anti-interference functions.
In the embodiment, a first resistor R2 is arranged between the control terminal of the first switching device Q1 and the signal output terminal of the Hall sensor HALL1, and a second resistor R3 is arranged between the control terminal of the first switching device Q1 and the common ground GND; a third resistor R4 is provided between the control terminal of the second switching device Q2 and the input terminal of the first switching device Q1, and a fourth resistor R5 is provided between the control terminal of the second switching device Q2 and the common ground GND.
In the present embodiment, the first switching device Q1 and the second switching device Q2 are both NMOS transistors, and in one case, a device of model NCE6020AK may be selected. In this case, the first switching device Q1 and the second switching device Q2 both have the gate of the NMOS transistor as the control terminal, the drain of the NMOS transistor as the input terminal, and the source of the NMOS transistor as the output terminal.
In this embodiment, the first coil L1, the second coil L2 and the HALL sensor HALL1 (the HALL sensor should be in the PCBA assembly, and since the HALL sensor needs to be placed nearby the rotor and the stator and the rotor need to be placed nearby, the HALL sensor is placed in the small cut of the silicon steel sheet in the stator assembly, which is referred to the corresponding content of the following embodiments) are all arranged in the motor assembly of the corresponding motor. The first coil L1 and the second coil L2 are respectively disposed at opposite positions of the rotor, and they are used to form an N pole and an S pole when a current flows, and the HALL sensor HALL1 is used to control when the first coil L1 and the second coil L2 are energized, that is, when the respective N pole and S pole are formed. The first coil L1 and the second coil L2 are arranged in opposite directions, and form N poles and S poles, wherein only one pole faces the rotor of the motor at a certain moment so as to drive the rotor to rotate.
The embodiment of the invention provides a two-phase pure hardware complementary type brushless direct current motor control circuit, which is simple, stable and reliable and has the working principle as follows:
when the HALL sensor HALL1 detects an N pole of a rotor of a corresponding motor (corresponding to fig. 5 corresponding to the following embodiment) (that is, the N pole is close to the HALL sensor HALL1), a signal output end (end 3) of the HALL sensor HALL1 outputs a high level (HALL signal), at this time, the first switching device Q1 is turned on, the power source VCC is loaded on the first coil L1, an S pole is formed at 90 degrees in the clockwise direction of the N pole of the rotor (the first coil L1 forms the S pole), and the rotor is pulled to rotate according to the opposite attraction force of the magnetic field;
when the HALL sensor HALL1 detects the S pole of the rotor of the corresponding motor (refer to corresponding content in fig. 5 corresponding to the following embodiment), the signal output end of the HALL sensor HALL1 outputs a low level, at this time, the second switching device Q2 is turned on, the power source VCC is loaded on the second coil L2, an N pole is formed at 90 degrees in the clockwise direction of the S pole of the rotor (the second coil L2 forms an N pole), and the rotor is pulled to rotate according to the attraction force of opposite magnetic fields;
the control circuit repeats the steps circularly and alternately, so that the rotor of the motor can be in a 360-degree rotation state all the time, and related loads can be driven.
That is, with the above structure, when the first switching device Q1 is turned on, the second switching device Q3 is turned off, and when the first switching device Q1 is turned off, the second switching device Q2 is turned on, and without software program control, complementation can be formed, and magnetic field cyclic switching is completed, so as to pull the rotor (refer to the corresponding content of the subsequent embodiments) to rotate 360 degrees.
The brushless direct current motor control circuit provided by the embodiment has the following advantages:
1. the brushless direct current motor control circuit is controlled by pure hardware, a microprocessing unit (MCU) such as a singlechip and the like is not needed to be controlled, a program is not needed to be developed, the research and development cost is low, and the brushless direct current motor control circuit is simplified;
2. the circuit is simple and easy to realize, and the material cost and the production cost are low;
3. the design of the corresponding motor is simple, the material is less, the cost is low, and the production efficiency is high;
4. the development period is short, and the production efficiency is high.
An embodiment of the invention provides another brushless dc motor control circuit, please refer to fig. 2.
The brushless dc motor control circuit provided in this embodiment is mostly the same as the circuit shown in fig. 1, except that in this embodiment, a transient voltage suppression diode TVS2 is connected between the input terminal and the output terminal of the first switching device Q1; a transient voltage suppression diode TVS3 is connected between the input end and the output end of the second switching device Q2; a transient voltage suppression diode TVS1 is connected between the power supply terminal and the power supply ground terminal of the HALL sensor HALL 1. Each transient voltage suppression diode has a cathode connected to the higher potential terminal and an anode connected to the common ground GND.
By adding a voltage stabilizing protection diode (transient voltage suppression diode) and by corresponding connection, the reliability of the product can be effectively improved, and the service life is longer.
For further details of the structure, nature and advantages of the present embodiment, reference may be made to the foregoing description of the embodiments.
An embodiment of the invention provides another brushless dc motor control circuit, please refer to fig. 3.
The brushless dc motor control circuit provided in this embodiment has the same structure as that of the circuit shown in fig. 2, but in this embodiment, an anti-reverse protection circuit (not labeled) is further provided between the power supply VCC and the power supply terminal of the HALL sensor HALL1, and between the first end of the first coil L1 and the second end of the second coil L2.
The reverse connection prevention protection circuit comprises a first voltage-dividing resistor R6, a second voltage-dividing resistor R7 and a third switching device Q3, wherein a control end (end 1) of the third switching device Q3 is connected between the first voltage-dividing resistor R6 and the second voltage-dividing resistor R7, an input end (end 3) of the third switching device Q3 is connected with a power supply VCC, and an output end (end 2) of the third switching device Q3 is connected with a power supply end of a Hall sensor HALL1, a first end of a first coil L1 and a second end of a second coil L2.
The third switching device Q3 may also be a device of NCE6020AK with a gate as a corresponding control terminal. In other embodiments, other types of switching devices may be used as the switching device of the reverse-connection protection circuit.
By adding the following third switching device Q3 at the input end of the power supply VCC, the first voltage-dividing resistor R6 and the second voltage-dividing resistor R7 are used for realizing reverse-connection prevention protection, so that the product cannot be burned out when a user carelessly connects the power supply VCC reversely.
For further details of the structure, nature and advantages of the present embodiment, reference may be made to the foregoing description of the embodiments.
An embodiment of the invention provides another brushless dc motor control circuit, please refer to fig. 4.
The brushless dc motor control circuit provided in this embodiment has the same structure as that of the circuit shown in fig. 3, but in this embodiment, the brushless dc motor control circuit further includes a dc-dc conversion circuit. The DC-DC conversion circuit comprises a power management single chip U1 and a corresponding resistor and capacitor C2, wherein the capacitor C2 is connected between a power input pin (1 pin) and a switch pin (5 pin) of the power management single chip U1. The resistor includes: a resistor R8 connected between an output pin (pin 2) and a feedback pin (pin 4) of the power management single chip U1; and a resistor R9 connected between the feedback pin (4 pins) and the common pin (3 pins) of the power management single chip U1. In this embodiment, the power management single chip U1 may be a chip of the type LM2596, a voltage drop type power management chip.
In the embodiment, the direct current-direct current conversion circuit is added, so that inventory control of the motor can be better realized, the motor does not need to be redesigned, wide voltage range input can be compatible due to the addition of the direct current-direct current conversion circuit, and the performance is not affected.
In other embodiments, power management chips of other types can be arranged to realize voltage conversion and circuit stabilization, and expand the application range of the circuit.
For further details of the structure, nature and advantages of the present embodiment, reference may be made to the foregoing description of the embodiments.
An embodiment of the present invention further provides a brushless dc motor, and as shown in fig. 5, a motor 100 includes a stator 102 and a rotor 101, and further includes a brushless dc motor control circuit provided in the foregoing embodiment.
The HALL sensor 103 (refer to HALL sensor HALL1 of the foregoing embodiment) in the control circuit of the brushless dc motor is connected and fixed on the stator 102, and the stator 102 is a fixed coil with the first coil L1 and the second coil L2 of the foregoing embodiment, that is, the first coil L1 and the second coil L2 constitute the main part of the stator 102, the first coil L1 and the second coil L2 are alternately arranged, the HALL sensor 103 is located on the stator 102, and the HALL sensor 103 is further connected to the corresponding PCB board 104(PCBA), and the PCB board 104 is arranged on the top of the brushless dc motor, as shown in fig. 5.
It should be noted that, as mentioned above, the hall sensor 103 should be part of the PCBA assembly (the PCB board 104 is also part of the PCBA assembly), the hall sensor 103 needs to be placed nearby next to the rotor 101, and the stator 102 needs to be placed nearby next to the rotor 101, so that a small opening (not labeled) is cut in the silicon steel sheet in the stator 102 assembly to place the hall sensor 103, as shown in fig. 5.
With the brushless dc motor control circuit of the foregoing embodiment, the brushless dc motor 100 provided in this embodiment has various advantages of the circuit of the foregoing embodiment, and has the advantages of simple motor design, less material, low cost, high production efficiency, short development period, and high production efficiency.
An embodiment of the invention provides another micro water pump, please refer to fig. 6 and fig. 7.
A part of the micro-water pump 10 is the brushless dc motor 100 of the foregoing embodiment, and therefore, reference may be made to fig. 5 in combination.
Fig. 6 shows that the micro water pump 10 includes a pump body 11 and a pump cover 12, and the pump body 11 and the pump cover 12 have corresponding connection structures (not labeled), which may have a quadrilateral pattern.
Pump body 11 is a cylindrical structure, and brushless dc motor 100 is located at this portion of pump body 11. The pump cover 12 is a circular cover-shaped structure and is connected with a corresponding water inlet and outlet.
Fig. 7 shows the micro water pump 10 in a bottom view, the pump cover 12 is circular in shape in the bottom view, the connection structure is rectangular in shape with a chamfer angle in the top view, and the chamfer angle is a straight chamfer angle.
The pump cover 12 has a water chamber (not labeled, as shown in fig. 7) therein, an impeller (not labeled, as shown in fig. 7) connected to the lower end of the rotor 101 shown in fig. 5, and the pump cover 12 further has a water inlet 13 axially communicating with the water chamber and a water outlet 14 circumferentially communicating with the water chamber.
As previously mentioned, the water inlet 13 is shown in fig. 7 as directly exposing the respective water chamber and impeller, while the water outlet 14 extends tangentially from the pump cap 12.
The pump cover 12 further has an anti-evacuation water inlet 12a, and the anti-evacuation water inlet 12a penetrates through the pump cover 12 and communicates with the water chamber, is a through hole with a uniform diameter, and vertically penetrates through the side wall of the pump cover 12.
The water outlet 14 of the pump cover 12, which is circumferentially communicated with the water chamber, is generally communicated with the water chamber in a tangential communication manner so as to facilitate the drainage of the micro water pump 10.
In this embodiment, the evacuation prevention water inlet hole 12a provided with the micro water pump 10 is provided in the circumferential side surface of the pump cover 12. In other embodiments, the evacuation-proof water inlet hole may be disposed at the inclined bottom of the pump cover, as long as it is easier to fill the water cavity in the pump cover 12 with water (i.e., to fill the impeller with water) than the water inlet 13.
The aperture range of the anti-pumping water inlet 12a of the micro water pump 10 is 1.5 mm-4 mm, and 2mm is selected in the embodiment. In other embodiments, other dimensions may be selected.
The aperture direct influence of the evacuation-proof inlet opening 12a prevents the realization of the function of the evacuation-proof inlet opening 12a itself and the realization of the flushing function of the miniature pump 10: on one hand, if the anti-pumping water inlet hole 12a is too small, a good auxiliary water inlet function cannot be achieved, and the anti-pumping function of the micro water pump 10 cannot be ensured; on the other hand, if the evacuation-proof water inlet 12a is too large, too much water may be flushed out of the evacuation-proof water inlet 12a during flushing of the micro water pump 10, which affects the flushing water pressure of the micro water pump 10, and affects the flushing effect of the micro water pump 10 in the subsequent corresponding flushing application scenario, for example, after the micro water pump 10 is installed in a toilet, the flushing effect of the micro water pump 10 on washing the toilet is affected.
In this embodiment, the evacuation-preventing water inlet hole 12a is also disposed at a higher position of the pump cover 12 close to the pump body as much as possible, where the higher position is a higher position when the micro water pump 10 is inverted. Because the micro-water pump 10 is usually installed upside down when being installed (for example, the micro-water pump 10 is installed upside down in the water tank of the toilet, and the micro-water pump 10 is used for functions of washing and flushing the toilet at this time), the anti-pumping water inlet hole 12a is arranged at a higher position of the pump cover 12, so that the water chamber can be filled with water as long as water does not pass through the anti-pumping water inlet hole 12 a.
That is, the anti-pumping water inlet 12a is designed such that the micro water pump 10 can conveniently and quickly evacuate air in the water chamber of the pump cover 12 by using the anti-pumping water inlet 12a no matter during the installation process or during the process of making the water level sink over the pump cover 12 again after the water level is lowered.
In summary, the micro water pump 10 provided in this embodiment has the anti-pumping water inlet 12a, so that when the micro water pump is installed in corresponding water and the water level is higher than the water cavity, the water cavity inside the micro water pump 10 can be conveniently filled with water during the installation process; and also can guarantee constantly that water is over preventing when taking out air inlet 12a and the water level is higher than the water cavity in the use, fill water in the water cavity to prevent that miniature pump 10 from taking place to find time the phenomenon when the bath, prevent to appear because of managing to find time and wash the not good phenomenon of effect, prevent to find time the sound of managing to find time because of the ear that appears of managing to find time.
Meanwhile, the micro-water pump 10 provided by the present embodiment has the structure of the brushless dc motor 100, and therefore, has the advantages of the foregoing embodiments.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A brushless dc motor control circuit, comprising:
the first end of the first coil is connected with a power supply;
the first end of the second coil is connected with a power supply;
the power supply end of the Hall sensor is connected with a power supply, and the power supply ground end of the Hall sensor is connected with a common ground;
the input end of the first switching device is connected with the second end of the first coil, the output end of the first switching device is connected with a common ground, and the control end of the first switching device is connected with the signal output end of the Hall sensor;
the input end of the second switching device is connected with the second end of the second coil, the output end of the second switching device is connected with the common ground, and the control end of the second switching device is connected with the input end of the first switching device.
2. The brushless dc motor control circuit of claim 1, wherein the hall sensor has a capacitance between a power supply terminal and a power ground terminal.
3. The brushless dc motor control circuit of claim 1, wherein a first resistor is provided between the control terminal of the first switching device and the signal output terminal of the hall sensor, and a second resistor is provided between the control terminal of the first switching device and a common ground; and a third resistor is arranged between the control terminal of the second switching device and the input terminal of the first switching device, and a fourth resistor is arranged between the control terminal of the second switching device and the common ground.
4. The brushless dc motor control circuit of claim 1, wherein the first switching device and the second switching device are both NMOS transistors.
5. The brushless dc motor control circuit of claim 1, wherein a transient voltage suppression diode is connected between the input terminal and the output terminal of the first switching device; a transient voltage suppression diode is connected between the input end and the output end of the second switching device; and a transient voltage suppression diode is connected between the power supply end and the power supply ground end of the Hall sensor.
6. The brushless dc motor control circuit of claim 1, further comprising an anti-reverse protection circuit between a power supply and the power supply terminal of the hall sensor, the first end of the first coil, and the second end of the second coil.
7. The brushless dc motor control circuit according to claim 6, wherein the reverse-connection prevention protection circuit includes a first voltage-dividing resistor, a second voltage-dividing resistor, and a third switching device, a control terminal of the third switching device is connected between the first voltage-dividing resistor and the second voltage-dividing resistor, an input terminal of the third switching device is connected to a power supply, and an output terminal of the third switching device is connected to the power supply terminal of the hall sensor, the first terminal of the first coil, and the second terminal of the second coil.
8. The brushless dc motor control circuit of claim 6, further comprising a dc-dc conversion circuit.
9. A brushless dc motor comprising a stator and a rotor, further comprising the brushless dc motor control circuit according to any one of claims 1 to 8, wherein the hall sensor is fixedly connected to the stator, and the stator has the first coil and the second coil as fixed coils.
10. A micro-water pump comprising the brushless dc motor according to claim 9.
CN202011433170.0A 2020-12-09 2020-12-09 Brushless direct current motor control circuit, brushless direct current motor and miniature water pump Pending CN112600363A (en)

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CN202011433170.0A CN112600363A (en) 2020-12-09 2020-12-09 Brushless direct current motor control circuit, brushless direct current motor and miniature water pump

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Application Number Priority Date Filing Date Title
CN202011433170.0A CN112600363A (en) 2020-12-09 2020-12-09 Brushless direct current motor control circuit, brushless direct current motor and miniature water pump

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CN112600363A true CN112600363A (en) 2021-04-02

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CN202011433170.0A Pending CN112600363A (en) 2020-12-09 2020-12-09 Brushless direct current motor control circuit, brushless direct current motor and miniature water pump

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