CN212115193U - Constant speed circuit of motor - Google Patents
Constant speed circuit of motor Download PDFInfo
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- CN212115193U CN212115193U CN202020729464.7U CN202020729464U CN212115193U CN 212115193 U CN212115193 U CN 212115193U CN 202020729464 U CN202020729464 U CN 202020729464U CN 212115193 U CN212115193 U CN 212115193U
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Abstract
The utility model discloses a motor constant speed circuit, it includes the battery cell, motor power supply unit and motor voltage detection unit and motor that are connected with the battery cell, motor power supply unit is including connecting between the VCC end of battery cell and motor and being used for controlling the MOS pipe that motor power supply unit is the motor power supply and being used for controlling the triode that the MOS pipe switched on and being used for controlling the switch that the triode switches on, the VCC end of battery cell is connected to the S utmost point of MOS pipe, the D utmost point of MOS pipe connects the motor, the C utmost point of triode is connected to the G utmost point of MOS pipe, the E utmost point of triode is connected ground, the B utmost point of triode is connected first, connect switch behind the second resistance, VCC end is connected to the switch; the motor voltage detection unit comprises a first resistor, a fourth resistor and a voltage reference chip, wherein the first resistor and the fourth resistor are connected to two ends of the motor in parallel, the voltage reference chip is connected with the first resistor and the fourth resistor, and the voltage reference chip is also connected with the first resistor. The utility model discloses the circuit is simple, and is with low costs, can realize that the motor rotational speed is invariable.
Description
The technical field is as follows:
the utility model relates to a motor control technical field refers in particular to a motor constant speed circuit.
Background art:
at present, a motor driving circuit of an electric tool (such as a dust collector and the like) powered by a lithium battery often requires a constant-speed output mode of a motor, and the motor can keep constant rotating speed output under the condition of very high or very low cell voltage. The designer usually uses MCU for control, and because the MCU in the method is used as a main control unit, special software control needs to be written, and the MCU needs to detect and adjust the duty ratio, the control method is complex, and the cost is high.
In view of the above, the present inventors propose the following.
The utility model has the following contents:
an object of the utility model is to overcome prior art's not enough, provide a motor constant speed circuit.
In order to solve the technical problem, the utility model discloses a following technical scheme: the motor constant-speed circuit comprises a battery unit, a motor power supply unit and a motor voltage detection unit which are connected with the battery unit, and a motor which is connected with the motor power supply unit and the motor voltage detection unit, wherein the motor power supply unit comprises an MOS (metal oxide semiconductor) tube which is connected between a VCC (voltage to current) end of the battery unit and the motor and is used for controlling the motor power supply unit to supply power to the motor, a triode which is used for controlling the conduction of the MOS tube, and a switch which is used for controlling the conduction of the triode; the motor voltage detection unit comprises a third resistor, a fourth resistor and a voltage reference chip, wherein the third resistor and the fourth resistor are connected to two ends of the motor in parallel, the voltage reference chip is connected with the third resistor and the fourth resistor, and the voltage reference chip is also connected with the first resistor.
Further, in the above technical solution, the model of the voltage reference chip is AZ 431.
Further, in the foregoing technical solution, the end a of the voltage reference chip is connected to the fourth resistor and the negative electrode of the motor, the end K of the voltage reference chip is connected to the first resistor, and the end R of the voltage reference chip is connected between the third resistor and the fourth resistor.
Further, in the above technical solution, a diode D2 and a capacitor C1 are connected in parallel to two ends of the motor.
Further, in the above technical solution, a zener diode ZD1 is connected between the S pole and the G pole of the MOS transistor, and two ends of the zener diode ZD1 are further connected in parallel with a resistor R1.
Further, in the above technical solution, the motor power supply unit includes a VCC terminal, a fuse F1, a battery, a circuit breaker, and a ground, which are connected in sequence, and the VCC terminal and the ground are respectively connected to the positive and negative electrodes of the motor.
After the technical scheme is adopted, compared with the prior art, the utility model has following beneficial effect: the utility model discloses a theory of operation does: when the switch is closed, the triode is conducted, the MOS tube is further driven to be conducted, and the battery unit supplies power to the motor. When the voltage on the motor exceeds 3V, the voltage reference chip can pull down the voltage on the first resistor and the second resistor connecting line, so that the voltage of the base electrode of the triode is pulled down, the conduction resistance of the triode is increased, the bias voltage of the MOS tube is reduced, the conduction resistance of the MOS tube is increased, the voltage on the motor is reduced, and the constant speed function of the motor is realized. The utility model discloses the circuit is simple, need not to use the MCU chip, need not the programming to it is with low costs, also can realize the motor rotational speed invariant, the order the utility model discloses extremely strong market competition has.
Description of the drawings:
fig. 1 is a circuit diagram of the present invention.
The specific implementation mode is as follows:
the present invention will be further described with reference to the following specific embodiments and accompanying drawings.
Referring to fig. 1, there is shown a motor constant speed circuit including a battery unit 1, a motor power supply unit 2 and a motor voltage detection unit 3 connected to the battery unit 1, and a motor 4 connected to the motor power supply unit 2 and the motor voltage detection unit 3, the motor power supply unit 2 comprises an MOS transistor 21 connected between the VCC terminal 11 of the battery unit 1 and the motor 4 for controlling the motor power supply unit 2 to supply power to the motor 4, a transistor 22 for controlling the conduction of the MOS transistor 21 and a switch 23 for controlling the conduction of the transistor 22, the S pole of the MOS transistor 21 is connected to the VCC end 11 of the battery unit 1, the D pole of the MOS transistor 21 is connected to the motor 4, the G pole of the MOS transistor 21 is connected to the C pole of the transistor 22, the E pole of the transistor 22 is connected to ground, the B pole of the triode 22 is connected with the switch 23 after being connected with the first resistor 24 and the second resistor 25, and the switch 23 is connected with the VCC end; the motor voltage detecting unit 3 includes a third resistor 31 and a fourth resistor 32 connected in parallel to both ends of the motor 4, and a voltage reference chip 33 connected to the third resistor 31 and the fourth resistor 32, and the voltage reference chip 33 is further connected to the first resistor 24. The utility model discloses a theory of operation does: when the switch 23 is closed, the transistor 22 is turned on, and the MOS transistor 21 is driven to be turned on, so that the battery unit 1 supplies power to the motor 4. When the voltage of the motor 4 exceeds 3V, the voltage reference chip 33 pulls down the voltage on the connection line between the first resistor 24 and the second resistor 25, thereby pulling down the voltage at the base of the triode 22, increasing the on-resistance of the triode 22, reducing the bias voltage of the MOS transistor 21, increasing the on-resistance of the MOS transistor 21, reducing the voltage of the motor 4, and realizing the constant speed function of the motor 4. The utility model discloses the circuit is simple, need not to use the MCU chip, need not the programming to it is with low costs, also can realize the motor rotational speed invariant, the order the utility model discloses extremely strong market competition has.
The model of the voltage reference chip 33 is AZ 431. The terminal a of the voltage reference chip 33 is connected to the fourth resistor 32 and the negative electrode of the motor 4, the terminal K of the voltage reference chip 33 is connected to the first resistor 24, and the terminal R of the voltage reference chip 33 is connected between the third resistor 31 and the fourth resistor 32.
A diode D2 and a capacitor C1 are connected in parallel to both ends of the motor 4.
A voltage stabilizing diode ZD1 is connected between the S pole and the G pole of the MOS transistor 21, and a resistor R1 is connected in parallel at two ends of the voltage stabilizing diode ZD 1.
The motor power supply unit 2 comprises a VCC end 11, a fuse F1, a battery 12, a circuit breaker 13 and a ground which are connected in sequence, wherein the VCC end 11 and the ground are respectively connected with the positive pole and the negative pole of the motor 4. The motor power supply unit 2 is safe and reliable to use.
To sum up, the utility model discloses a theory of operation does: when the switch 23 is closed, the transistor 22 is turned on, and the MOS transistor 21 is driven to be turned on, so that the battery unit 1 supplies power to the motor 4. When the voltage of the motor 4 exceeds 3V, the voltage reference chip 33 pulls down the voltage on the connection line between the first resistor 24 and the second resistor 25, thereby pulling down the voltage at the base of the triode 22, increasing the on-resistance of the triode 22, reducing the bias voltage of the MOS transistor 21, increasing the on-resistance of the MOS transistor 21, reducing the voltage of the motor 4, and realizing the constant speed function of the motor 4. The utility model discloses the circuit is simple, need not to use the MCU chip, need not the programming to it is with low costs, also can realize the motor rotational speed invariant, the order the utility model discloses extremely strong market competition has.
Of course, the above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes and modifications made by the constructions, features, and principles of the present invention in accordance with the claims of the present invention are intended to be included in the scope of the present invention.
Claims (6)
1. Motor constant speed circuit, it includes battery unit (1), motor power supply unit (2) and motor voltage detection unit (3) and motor (4) with this motor power supply unit (2) and motor voltage detection unit (3) connection that are connected with battery unit (1), its characterized in that:
the motor power supply unit (2) comprises an MOS (metal oxide semiconductor) tube (21) which is connected between a VCC (voltage converter) end (11) of the battery unit (1) and the motor (4) and used for controlling the motor power supply unit (2) to supply power to the motor (4), a triode (22) used for controlling the conduction of the MOS tube (21) and a switch (23) used for controlling the conduction of the triode (22), wherein the S pole of the MOS tube (21) is connected with the VCC end (11) of the battery unit (1), the D pole of the MOS tube (21) is connected with the motor (4), the G pole of the MOS tube (21) is connected with the C pole of the triode (22), the E pole of the triode (22) is connected with the ground, the B pole of the triode (22) is connected with the switch (23) after being connected with a first resistor (24) and a second resistor (25), and the switch (23) is connected with the VCC end; the motor voltage detection unit (3) comprises a third resistor (31) and a fourth resistor (32) which are connected to two ends of a motor (4) in parallel and a voltage reference chip (33) connected with the third resistor (31) and the fourth resistor (32), wherein the voltage reference chip (33) is also connected with the first resistor (24).
2. The motor constant speed circuit of claim 1, wherein: the model of the voltage reference chip (33) is AZ 431.
3. The motor constant speed circuit of claim 1, wherein: the A end of the voltage reference chip (33) is connected with the fourth resistor (32) and the negative electrode of the motor (4), the K end of the voltage reference chip (33) is connected with the first resistor (24), and the R end of the voltage reference chip (33) is connected between the third resistor (31) and the fourth resistor (32).
4. The motor constant speed circuit of claim 3, wherein: and a diode D2 and a capacitor C1 are connected in parallel at two ends of the motor (4).
5. The motor constant speed circuit according to any one of claims 1 to 4, characterized in that: and a voltage stabilizing diode ZD1 is connected between the S pole and the G pole of the MOS transistor (21), and two ends of the voltage stabilizing diode ZD1 are also connected with a resistor R1 in parallel.
6. The motor constant speed circuit according to any one of claims 1 to 4, characterized in that: the motor power supply unit (2) comprises a VCC end (11), a fuse F1, a battery (12), a circuit breaker (13) and a ground which are connected in sequence, wherein the VCC end (11) and the ground are respectively connected with the positive electrode and the negative electrode of the motor (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020729464.7U CN212115193U (en) | 2020-05-05 | 2020-05-05 | Constant speed circuit of motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020729464.7U CN212115193U (en) | 2020-05-05 | 2020-05-05 | Constant speed circuit of motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212115193U true CN212115193U (en) | 2020-12-08 |
Family
ID=73616744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020729464.7U Active CN212115193U (en) | 2020-05-05 | 2020-05-05 | Constant speed circuit of motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212115193U (en) |
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2020
- 2020-05-05 CN CN202020729464.7U patent/CN212115193U/en active Active
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