CN220234506U - PWM driving circuit and permanent magnet synchronous motor using same - Google Patents
PWM driving circuit and permanent magnet synchronous motor using same Download PDFInfo
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- CN220234506U CN220234506U CN202321290733.4U CN202321290733U CN220234506U CN 220234506 U CN220234506 U CN 220234506U CN 202321290733 U CN202321290733 U CN 202321290733U CN 220234506 U CN220234506 U CN 220234506U
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Abstract
The utility model discloses a PWM driving circuit which comprises a hysteresis comparator, a first diode, a second diode, a first load element, a second load element, a first capacitor, a second capacitor, a microprocessor, a third load element, a first triode, a second triode, a third triode, a fourth load element, a fifth load element, a fourth triode, a fifth triode, a sixth load element, a seventh load element and an eighth load element. The utility model also discloses a permanent magnet synchronous motor applying the PWM driving circuit. Compared with the prior art, the utility model has the advantage of good stability.
Description
Technical Field
The utility model relates to the field of synchronous motor circuits, in particular to a PWM driving circuit and a permanent magnet synchronous motor using the same.
Background
The driving circuit is a circuit for amplifying a control signal between the main circuit and the design circuit, and determines the performance of the synchronous motor to a large extent. The driving circuit in the prior art is often complex in design, but is relatively poor in stability. In view of this, a PWM driving circuit and a permanent magnet synchronous motor using the same are provided.
Disclosure of Invention
The utility model aims to provide a PWM driving circuit and a permanent magnet synchronous motor using the same, which have the advantage of good stability.
The technical aim of the utility model is realized by the following technical scheme:
a PWM driving circuit comprises a hysteresis comparator, a first diode, a second diode, a first load element, a second load element, a first capacitor, a second capacitor, a microprocessor, a third load element, a first triode, a second triode, a third triode, a fourth load element, a fifth load element, a fourth triode, a fifth triode, a sixth load element, a seventh load element and an eighth load element, wherein the hysteresis comparator, the first diode, the first capacitor, the second capacitor and the second load element are in annular connection, two ends of the first load element are respectively connected with two ends of the first diode, two ends of the second diode are respectively connected with two ends of the second load element, one of pins of the microprocessor is connected between the first diode and the first capacitor, one of pins of the microprocessor is connected between the second load element and the second diode, one of pins of the microprocessor is connected between the third load element and the third diode, one of the third load element is connected between the third triode, one of the other ends of the third load element is connected between the third triode and the third triode, one of the third triode is connected between the third triode and the other ends of the third load element is connected between the third triode, one end of the sixth load element is connected with one of the pins of the microprocessor, the other end of the sixth load element is connected with the base electrode of the fourth triode, the emitter electrode of the fourth triode is connected with the collector electrode of the fifth triode, the emitter electrode of the fifth triode is connected with the emitter electrode of the sixth triode, the eighth load element is connected between the emitter electrode of the fifth triode and the emitter electrode of the sixth triode, two ends of the seventh load element are respectively connected with the collector electrode of the sixth triode and the base electrode of the fifth triode, the collector electrode of the fourth triode is connected between the seventh load element and the base electrode of the fifth triode, and the base electrode of the sixth triode is connected between the seventh load element and the collector electrode of the fourth triode.
In a preferred embodiment, the first, second, third, fourth, fifth, sixth, seventh and eighth load elements are provided as resistors.
In a preferred embodiment, the resistances of the first and second load elements are set to 2.8-3kΩ, the resistance of the third load element is set to 1-1.5kΩ, the resistance of the fourth load element is set to 2.8-3kΩ, the resistance of the fifth load element is set to 5.5-6kΩ, the resistance of the sixth load element is set to 9-10kΩ, the resistance of the seventh load element is set to 5.5-6kΩ, and the resistance of the eighth load element is set to 2.5-3kΩ.
In a preferred embodiment, the resistances of the first and second load elements are set to 3kΩ, the resistance of the third load element is set to 1kΩ, the resistance of the fourth load element is set to 3kΩ, the resistance of the fifth load element is set to 6kΩ, the resistance of the sixth load element is set to 10kΩ, the resistance of the seventh load element is set to 6kΩ, and the resistance of the eighth load element is set to 3kΩ.
In a preferred embodiment, the microprocessor is model number 74HC132.
A permanent magnet synchronous motor applies the PWM driving circuit.
Compared with the prior art, the utility model provides a PWM driving circuit and a permanent magnet synchronous motor applying the same, which generate two paths of PWM waves from an initial path of signal. And the two PWM signal waves have the characteristic of dead zone, and the generated PWM waves are finally transmitted to the two power tubes G7 and G8 for driving, so that the stability is better.
Drawings
Fig. 1 is a schematic diagram of a PWM driving circuit according to the present utility model.
In the figure
A hysteresis comparator 1; a first diode 2; a second diode 3; a first load element 4; a second load element 5; a first capacitor 6; a second capacitor 7; a microprocessor 8; a third load element 9; a first transistor 10; a second triode 11; a third transistor 12; a fourth load element 13; a fifth load element 14; a fourth transistor 15; a fifth transistor 16; a sixth transistor 17; a sixth load element 18; a seventh load element 19; and an eighth load element 20.
Detailed Description
The present utility model will be described in further detail with reference to the accompanying drawings.
The present embodiment is only for explanation of the present utility model and is not to be construed as limiting the present utility model, and modifications to the present embodiment, which may not creatively contribute to the present utility model as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present utility model.
Example 1
As shown in fig. 1, a PWM driving circuit includes a hysteresis comparator 1, a first diode 2, a second diode 3, a first load element 4, a second load element 5, a first capacitor 6, a second capacitor 7, a microprocessor 8, a third load element 9, a first triode 10, a second triode 11, a third triode 12, a fourth load element 13, a fifth load element 14, a fourth triode 15, a fifth triode 16, a sixth triode 17, a sixth load element 18, a seventh load element 19, and an eighth load element 20, wherein the hysteresis comparator 1, the first diode 2, the first capacitor 6, the second capacitor 7, and the second load element 5 are annularly connected, two ends of the first load element 4 are respectively connected with two ends of the first diode 2, two ends of the second diode 3 are respectively connected with two ends of the second load element 5, one of the pins of the microprocessor 8 is connected between the first diode 2 and the first capacitor 6, one of the pins of the microprocessor 8 is connected between the first capacitor 6 and the second capacitor 7, one of the pins of the microprocessor 8 is connected between the second load element 5 and the second diode 3, one end of the third load element 9 is connected with one of the pins of the microprocessor 8, the other end is connected with the emitter of the first triode 10, the collector of the first triode 10 is connected with the base of the third triode 12, the base of the second triode 11 is connected between the collector of the first triode 10 and the base of the third triode 12, the emitter of the second triode 11 is connected with the emitter of the third triode 12, the fourth load element 13 is connected between the emitter of the second triode 11 and the emitter of the third triode 12, one end of the fifth load element 14 is connected with the collector of the third triode 12, the other end of the fifth load element is connected with the base of the third triode 12, one end of the sixth load element 18 is connected with one of the pins of the microprocessor 8, the other end of the sixth load element 18 is connected with the base of the fourth triode 15, the emitter of the fourth triode 15 is connected with the collector of the fifth triode 16, the emitter of the fifth triode 16 is connected with the emitter of the sixth triode 17, the eighth load element 20 is connected between the emitter of the fifth triode 16 and the emitter of the sixth triode 17, the two ends of the seventh load element 19 are respectively connected with the collector of the sixth triode 17 and the base of the fifth triode 16, the collector of the fourth triode 15 is connected between the seventh load element 19 and the base of the fifth triode 16, and the base of the sixth triode 17 is connected between the seventh load element 19 and the collector of the fourth triode 15.
Further, the first load element 4, the second load element 5, the third load element 9, the fourth load element 13, the fifth load element 14, the sixth load element 18, the seventh load element 19 and the eighth load element 20 are provided as resistors.
Specifically, the resistances of the first load element 4 and the second load element 5 are set to 2.8-3kΩ, the resistance of the third load element 9 is set to 1-1.5kΩ, the resistance of the fourth load element 13 is set to 2.8-3kΩ, the resistance of the fifth load element 14 is set to 5.5-6kΩ, the resistance of the sixth load element 18 is set to 9-10kΩ, the resistance of the seventh load element 19 is set to 5.5-6kΩ, and the resistance of the eighth load element 20 is set to 2.5-3kΩ
Specifically, the resistance values of the first load element 4 and the second load element 5 are set to 3kΩ, the resistance value of the third load element 9 is set to 1kΩ, the resistance value of the fourth load element 13 is set to 3kΩ, the resistance value of the fifth load element 14 is set to 6kΩ, the resistance value of the sixth load element 18 is set to 10kΩ, the resistance value of the seventh load element 19 is set to 6kΩ, and the resistance value of the eighth load element 20 is set to 3kΩ.
Specifically, the model number of the microprocessor 8 is 74HC132.
A PWM driving circuit of the present embodiment generates two PWM waves from an initial signal. And the two PWM signal waves have the characteristic of dead zone, and the generated PWM waves are finally transmitted to two power tubes G7 and G8 for driving.
The specific working principle is that in order to enable hardware to generate a delay signal, the signal is amplified by utilizing a triode, wherein the acquisition of the delay signal is completed by an RC circuit, and the time length T of the delay is determined by parameters in the RC circuit. The value is calculated as:
wherein V is 1 =24v, power supply size; voltage magnitude V at initial time 0 =0v; the voltage value of the capacitor at the moment is the voltage value of the two ends of the capacitor at any moment T, and the time delay time T is calculated by firstly assuming that the voltage value at the moment T is increased to 12V. Load element r=3kΩ, capacitance c=200pf; the delay time T can be calculated by the following equation.
The above formula shows that the dead time is about 600ns, and when one bridge arm in the inverter is closed simultaneously, that is, both PWM4 and PWM5 obtain high level signals, the time of switching off the upper bridge arm and the lower bridge arm, that is, the dead time, can be measured by an oscilloscope. Dead time, a general special chip gives a calculation formula, but is complex to use; in practice, engineers may be given experience or similar circuits. Looking up the related data, it can be determined that the circuit is relatively reasonable when the dead time calculated value of the MOSFET in the circuit is 400ns-1200 ns.
Example two
A permanent magnet synchronous motor is provided, which employs a PWM driving circuit in one embodiment.
The embodiments described above are intended to facilitate a person of ordinary skill in the art in order to make and use the present utility model, it will be apparent to those skilled in the art that various modifications may be made to the embodiments and that the general principles described herein may be applied to other embodiments without the need for inventive faculty. Therefore, the present utility model is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present utility model.
Claims (6)
1. A PWM driving circuit is characterized by comprising a hysteresis comparator, a first diode, a second diode, a first load element, a second load element, a first capacitor, a second capacitor, a microprocessor, a third load element, a first triode, a second triode, a third triode, a fourth load element, a fifth load element, a fourth triode, a fifth triode, a sixth load element, a seventh load element and an eighth load element, wherein the hysteresis comparator, the first diode, the first capacitor, the second capacitor and the second load element are annularly connected, two ends of the first load element are respectively connected with two ends of the first diode, two ends of the second diode are respectively connected with two ends of the second load element, one of pins of the microprocessor is connected between the first diode and the first capacitor, one of pins of the microprocessor is connected between the first capacitor and the second capacitor, one of the third load element is connected between the second load element and the third diode, one of the pins of the microprocessor is connected between the third diode and the third load element, one of the third triode is connected between the third diode and the third diode, one of the third triode is connected between the third triode is connected with one of the third load element, the other end of the third triode is connected with one of the third triode, the other end is connected with the base electrode of the third triode, one end of the sixth load element is connected with one of pins of the microprocessor, the other end is connected with the base electrode of the fourth triode, the emitter electrode of the fourth triode is connected with the collector electrode of the fifth triode, the emitter electrode of the fifth triode is connected with the emitter electrode of the sixth triode, the eighth load element is connected between the emitter electrode of the fifth triode and the emitter electrode of the sixth triode, two ends of the seventh load element are respectively connected with the collector electrode of the sixth triode and the base electrode of the fifth triode, the collector electrode of the fourth triode is connected between the seventh load element and the base electrode of the fifth triode, and the base electrode of the sixth triode is connected between the seventh load element and the collector electrode of the fourth triode.
2. The PWM driving circuit according to claim 1, wherein the first load element, the second load element, the third load element, the fourth load element, the fifth load element, the sixth load element, the seventh load element, and the eighth load element are provided as resistors.
3. A PWM driving circuit according to claim 2, wherein the resistance of the first load element and the second load element is set to 2.8-3kΩ, the resistance of the third load element is set to 1-1.5kΩ, the resistance of the fourth load element is set to 2.8-3kΩ, the resistance of the fifth load element is set to 5.5-6kΩ, the resistance of the sixth load element is set to 9-10kΩ, the resistance of the seventh load element is set to 5.5-6kΩ, and the resistance of the eighth load element is set to 2.5-3kΩ.
4. A PWM driving circuit according to claim 3, wherein the resistance of the first load element and the second load element is set to 3kΩ, the resistance of the third load element is set to 1kΩ, the resistance of the fourth load element is set to 3kΩ, the resistance of the fifth load element is set to 6kΩ, the resistance of the sixth load element is set to 10kΩ, the resistance of the seventh load element is set to 6kΩ, and the resistance of the eighth load element is set to 3kΩ.
5. A PWM driving circuit according to claim 1, wherein the microprocessor is model 74HC132.
6. A permanent magnet synchronous motor, characterized in that it employs the PWM driving circuit according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321290733.4U CN220234506U (en) | 2023-05-25 | 2023-05-25 | PWM driving circuit and permanent magnet synchronous motor using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321290733.4U CN220234506U (en) | 2023-05-25 | 2023-05-25 | PWM driving circuit and permanent magnet synchronous motor using same |
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| Publication Number | Publication Date |
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| CN220234506U true CN220234506U (en) | 2023-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321290733.4U Active CN220234506U (en) | 2023-05-25 | 2023-05-25 | PWM driving circuit and permanent magnet synchronous motor using same |
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| Country | Link |
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| CN (1) | CN220234506U (en) |
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2023
- 2023-05-25 CN CN202321290733.4U patent/CN220234506U/en active Active
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