CN217486411U - potentiometer-PWM speed regulation circuit and DC brushless motor - Google Patents
potentiometer-PWM speed regulation circuit and DC brushless motor Download PDFInfo
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- CN217486411U CN217486411U CN202123443552.4U CN202123443552U CN217486411U CN 217486411 U CN217486411 U CN 217486411U CN 202123443552 U CN202123443552 U CN 202123443552U CN 217486411 U CN217486411 U CN 217486411U
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Abstract
The utility model belongs to the technical field of electronic circuits, in particular to a potentiometer-to-PWM speed regulation circuit and a DC brushless motor, wherein the potentiometer-to-PWM speed regulation circuit comprises a PWM controller and a potentiometer; at least one pin of the PWM controller is connected with the potentiometer, and the PWM controller is used for acquiring the input voltage of the potentiometer to output a PWM signal with a duty ratio corresponding to the input voltage; the PWM controller is also connected with a peripheral circuit. The utility model discloses be connected PWM controller and potentiometre, the PWM signal duty cycle of PWM controller output is adjusted through the output voltage who adjusts the potentiometre to the realization is from the potentiometre to the conversion of PWM control, simple structure, convenient and practical has utilized the functional characteristic of hardware itself, need not to write specific procedure, and is with low costs.
Description
Technical Field
The utility model belongs to the technical field of electronic circuit, especially, relate to a potentiometre changes PWM speed governing circuit and DC brushless motor.
Background
The brushless DC motor consists of permanent magnet rotor, multi-pole winding stator, position sensor, etc. The position sensor commutates the current of the stator winding along a certain sequence according to the change of the rotor position, namely, the position of the rotor magnetic pole relative to the stator winding is detected, a position sensor signal is generated at the determined position, the position sensor signal is processed by the signal conversion circuit to control the power switch circuit, and the winding current is switched according to a certain logic relation. The operating voltage of the stator winding is provided by an electronic switching circuit controlled by the output signal of the position sensor.
There are generally two speed-adjusting modes for a dc brushless motor: 1. and (5) simulating voltage speed regulation. And 2, PWM speed regulation. The two speed regulation modes do not exist at the same time generally, but the potentiometer is required to regulate the speed of the direct current brushless motor in many occasions. The analog voltage speed regulation interface can realize the change of analog voltage only by one potentiometer, and the direct current brushless motor can be regulated by directly adjusting the potentiometer, so that the speed regulation is simple and convenient. The PWM speed regulation needs a PWM signal, and the speed regulation of the direct current brushless motor is realized by changing the duty ratio of the PWM.
In the direct current brushless motor only with PWM speed regulation, the speed regulation can not be simply realized through an external potentiometer, the speed regulation can be realized only by converting analog direct current voltage of the potentiometer into PWM signals, and the conversion can be completed through a single chip microcomputer. Generally, a single chip with an AD acquisition function is adopted to sample analog direct current voltage of a potentiometer, and then the analog direct current voltage is converted into a PWM signal through the single chip. However, the single chip microcomputer is adopted to complete the function, the cost is high, software needs to be written, and the development process is relatively complex.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a potentiometre changes PWM speed governing circuit aims at solving and adopts the singlechip to accomplish simulation direct current voltage and convert PWM signal to, and the cost is higher to need write software, the relatively complicated problem of development process.
The embodiment of the utility model is realized in such a way that a potentiometer changes PWM speed regulation circuit, which comprises a PWM controller and a potentiometer;
at least one pin of the PWM controller is connected with the potentiometer, and the PWM controller is used for acquiring the input voltage of the potentiometer to output a PWM signal with a duty ratio corresponding to the input voltage;
the PWM controller is also connected with a peripheral circuit.
Preferably, the peripheral circuit includes an oscillation circuit.
Preferably, the oscillation circuit is further connected to a signal acquisition terminal of the PWM controller, and the signal acquisition terminal is configured to acquire an oscillation signal of the oscillation circuit.
Preferably, the oscillation circuit is a triangular wave oscillation circuit.
Preferably, the triangular wave oscillating circuit comprises a resistor R1 connected in series between two pins of the PWM controller, and capacitors C1 and C2 connected to two ends of the resistor R1, respectively, and the other ends of the capacitors C1 and C2 are grounded;
wherein, one pin connected with the triangular wave oscillating circuit is a power output pin.
Preferably, an inverting proportional amplifying circuit is arranged between the PWM controller and the potentiometer.
Preferably, the inverting proportional amplifying circuit is composed of an error amplifier and a peripheral resistor inside the PWM controller;
a resistor R3 is connected in series between the voltage feedback port and the output comparison port of the error amplifier, and a resistor R4 is connected in series between the voltage feedback port and the output end of the potentiometer.
Preferably, one fixed end of the potentiometer is connected with a power supply, the other fixed end of the potentiometer is connected with the ground, and the output end of the potentiometer is connected with a voltage feedback port of an error amplifier in the PWM controller.
Preferably, the PWM controller is a UC3843 chip.
Another object of the embodiments of the present invention is to provide a dc brushless motor, which includes:
a DC brushless motor body; and
the embodiment of the utility model provides a potentiometre changes PWM speed governing circuit.
The utility model discloses be connected PWM controller and potentiometre, the PWM signal duty cycle of PWM controller output is adjusted through the output voltage who adjusts the potentiometre to the realization is from the potentiometre to the conversion of PWM control, simple structure, convenient and practical has utilized the functional characteristic of hardware itself, need not to compile specific program, and is with low costs.
Drawings
Fig. 1 is a structural diagram of a potentiometer-to-PWM speed regulation circuit according to an embodiment of the present invention;
fig. 2 is an internal schematic diagram of the UC3843PWM controller.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description is provided for the specific embodiments of the present invention.
As shown in fig. 1, for the structure diagram of the potentiometer-to-PWM speed regulation circuit provided in the embodiment of the present invention, the potentiometer-to-PWM speed regulation circuit includes a PWM controller and a potentiometer;
at least one pin of the PWM controller is connected with the potentiometer, and the PWM controller is used for acquiring the input voltage of the potentiometer to output a PWM signal with a duty ratio corresponding to the input voltage;
the PWM controller is also connected with a peripheral circuit.
In this embodiment, the peripheral circuit includes an oscillation circuit, and optionally, the oscillation circuit may employ a triangular wave oscillation circuit. As a specific optional implementation manner, the triangular wave oscillating circuit includes a resistor R1 connected in series between two pins of the PWM controller, and capacitors C1 and C2 connected to two ends of the resistor R1, respectively, and the other ends of the capacitors C1 and C2 are grounded; wherein, one pin connected with the triangular wave oscillating circuit is a power output pin. For the UC3843 chip, the triangular wave oscillation circuit is connected between the 4 th pin and the 8 th pin, wherein the 8 th pin outputs a stable 5V power supply; fig. 2 shows an internal schematic diagram of the UC3843 chip.
In this embodiment, the oscillation circuit is further connected to a signal acquisition terminal of the PWM controller, and the signal acquisition terminal is configured to acquire an oscillation signal of the oscillation circuit. For the UC3843 chip, one end of the resistor R2 is connected to the 4 th pin, the other end is connected to the 3 rd pin, and the 3 rd pin is a current signal collecting end.
In an embodiment of the present invention, an inverting proportional amplifying circuit is disposed between the PWM controller and the potentiometer. The inverse proportion amplifying circuit consists of an error amplifier and a peripheral resistor inside the PWM controller; a resistor R3 is connected in series between the voltage feedback port and the output comparison port of the error amplifier, and a resistor R4 is connected in series between the voltage feedback port and the output end of the potentiometer. It can be understood that this is based on the specific arrangement of the UC3843 chip.
In an embodiment of the present invention, one fixed end of the potentiometer is connected to the power supply, the other fixed end is connected to the ground, and the output end is connected to the voltage feedback port of the error amplifier inside the PWM controller. It is understood that the fixed end refers to the power input end and the power ground of the potentiometer, and the output end refers to the adjusting end of the potentiometer. When the UC3843 chip is used, the adjustment terminal is specifically connected to the 2 nd pin of UC 3843. The resistors R3 and R4 and the internal operational amplifier of the PWM controller form an inverting proportional amplifier. The divided voltage of the potentiometer is compared with a triangular wave entering through a 3 rd pin of the PWM controller through an inverting proportional amplifier, and then a PWM signal output from a 6 th pin is output.
The utility model discloses a theory of operation:
when the voltage of the No. 3 pin of the potentiometer is adjusted to be high, the voltage entering the No. 2 pin of the PWM controller is also increased, the resistors R3 and R4 and the internal operational amplifier of the PWM controller form an inverting proportional amplifier, the output voltage is reduced, and the duty ratio of the PWM signal of the No. 6 pin of the PWM controller is reduced after the output voltage is compared with the triangular wave entering the No. 3 pin of the PWM controller.
When the voltage of the 3 rd pin of the potentiometer is adjusted to be low, the voltage entering the 2 nd pin of the PWM controller is also reduced, the resistors R3 and R4 and the internal operational amplifier of the PWM controller form an inverting proportional amplifier, the output voltage is increased, and the duty ratio of the PWM signal of the 6 th pin of the PWM controller is increased after the output voltage is compared with the triangular wave entering the 3 rd pin of the PWM controller.
The duty ratio of a PWM signal output by the 6 th pin of the PWM controller can be adjusted by adjusting the potentiometer, so that the aim of adjusting the speed of the direct current brushless motor through the PWM signal is fulfilled.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A potentiometer-to-PWM speed regulation circuit is characterized in that the potentiometer-to-PWM speed regulation circuit comprises a PWM controller and a potentiometer;
at least one pin of the PWM controller is connected with the potentiometer, and the PWM controller is used for acquiring the input voltage of the potentiometer to output a PWM signal with a duty ratio corresponding to the input voltage;
the PWM controller is also connected with a peripheral circuit.
2. A potentiometer-to-PWM speed regulation circuit according to claim 1, wherein the peripheral circuit comprises an oscillator circuit.
3. The potentiometer-to-PWM speed regulation circuit according to claim 2, wherein the oscillation circuit is further connected with a signal acquisition end of the PWM controller, and the signal acquisition end is used for acquiring oscillation signals of the oscillation circuit.
4. The potentiometer-to-PWM speed regulation circuit according to claim 2, wherein the oscillation circuit is a triangular wave oscillation circuit.
5. The potentiometer-to-PWM speed regulation circuit according to claim 4, wherein the triangular wave oscillation circuit comprises a resistor R1 connected in series between two pins of the PWM controller, and capacitors C1 and C2 respectively connected to two ends of the resistor R1, and the other ends of the capacitors C1 and C2 are grounded;
wherein, one pin connected with the triangular wave oscillating circuit is a power output pin.
6. The potentiometer-to-PWM speed regulation circuit according to claim 1, wherein an inverting proportional amplifying circuit is arranged between the PWM controller and the potentiometer.
7. The potentiometer-to-PWM speed regulation circuit according to claim 6, wherein the inverse proportion amplification circuit is composed of an error amplifier and a peripheral resistor inside a PWM controller;
a resistor R3 is connected in series between the voltage feedback port and the output comparison port of the error amplifier, and a resistor R4 is connected in series between the voltage feedback port and the output end of the potentiometer.
8. The potentiometer-to-PWM speed regulation circuit according to claim 1, wherein one fixed end of the potentiometer is connected with a power supply, the other fixed end of the potentiometer is connected with the ground, and the output end of the potentiometer is connected with a voltage feedback port of an error amplifier inside the PWM controller.
9. The potentiometer-to-PWM speed regulation circuit according to any one of claims 1 to 8, wherein the PWM controller is a UC3843 chip.
10. A dc brushless motor, comprising:
a DC brushless motor body; and
a potentiometer to PWM governor circuit according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123443552.4U CN217486411U (en) | 2021-12-31 | 2021-12-31 | potentiometer-PWM speed regulation circuit and DC brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123443552.4U CN217486411U (en) | 2021-12-31 | 2021-12-31 | potentiometer-PWM speed regulation circuit and DC brushless motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217486411U true CN217486411U (en) | 2022-09-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123443552.4U Active CN217486411U (en) | 2021-12-31 | 2021-12-31 | potentiometer-PWM speed regulation circuit and DC brushless motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217486411U (en) |
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2021
- 2021-12-31 CN CN202123443552.4U patent/CN217486411U/en active Active
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