CN211239731U - Drive circuit of single-phase alternating current motor - Google Patents
Drive circuit of single-phase alternating current motor Download PDFInfo
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- CN211239731U CN211239731U CN201922387047.9U CN201922387047U CN211239731U CN 211239731 U CN211239731 U CN 211239731U CN 201922387047 U CN201922387047 U CN 201922387047U CN 211239731 U CN211239731 U CN 211239731U
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Abstract
The utility model discloses a can adjust single phase alternating current motor's of single phase alternating current motor rotational speed drive circuit, include: working power supply, bidirectional thyristor, trigger circuit for controlling bidirectional thyristor and timing synchronization circuit for synchronizing trigger circuit, the trigger circuit include: the two output pins of the photoelectric isolation circuit for triggering are respectively connected with the two main electrodes of the bidirectional controllable silicon in a one-to-one correspondence way through output side current limiting resistors, and the gate pole of the bidirectional controllable silicon is connected with the corresponding output pin of the photoelectric isolation circuit for triggering; the output pin of the pulse width modulation circuit is connected with the control end of the photoelectric isolation circuit for triggering, and an anti-interference circuit is arranged between the power pin of the photoelectric isolation circuit for triggering and the working power supply. The drive circuit of the single-phase alternating current motor can be widely applied to various single-phase alternating current motors.
Description
Technical Field
The present invention relates to a drive circuit, and more particularly to a drive circuit for a single-phase ac motor.
Background
At present, the alternating current motor in traditional hand-held mantle fiber machine all adopts fixed rotational speed, promptly: the rotational speed thereof cannot be adjusted. In the actual use process, on one hand, the starting current is larger, so that the temperature rise of the alternating current motor is larger, and the service life of the alternating current motor is shortened; on the other hand, because the ac motor reaches a faster rated rotational speed instantaneously, there is a serious safety hazard to the operator and the surrounding related personnel.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: a drive circuit for a single-phase AC motor is provided, which can adjust the rotational speed of the single-phase AC motor.
In order to solve the technical problem, the utility model discloses a technical scheme is: a drive circuit of a single-phase alternating current motor, comprising: working power supply, bidirectional thyristor, and be used for controlling bidirectional thyristor's trigger circuit and be used for synchronous trigger circuit's chronogenesis synchronization circuit, trigger circuit's concrete structure includes: the two output pins of the photoelectric isolation circuit for triggering are respectively connected with the two main electrodes of the bidirectional controllable silicon in a one-to-one correspondence way through output side current limiting resistors, and the gate pole of the bidirectional controllable silicon is connected with the corresponding output pin of the photoelectric isolation circuit for triggering; the output pin of the pulse width modulation circuit is connected with the control end of the photoelectric isolation circuit for triggering, an anti-interference circuit is arranged between the power pin of the photoelectric isolation circuit for triggering and the working power supply, and the specific structure of the anti-interference circuit comprises: PNP type's second grade triode, NPN type's first grade triode, diode, input side current limiting resistor and a pair of divider resistance, this pair of divider resistance includes: the power supply side voltage-dividing resistor and the grounding side voltage-dividing resistor are connected, the resistance value of the power supply side voltage-dividing resistor is more than twice of that of the grounding side voltage-dividing resistor, one end of the power supply side voltage-dividing resistor is connected with one end of the grounding side voltage-dividing resistor and then connected with the anode of the diode, the other end of the power supply side voltage-dividing resistor is connected with the anode of the working power supply, the other end of the grounding side voltage-dividing resistor is connected with the cathode of the working power supply, the cathode of the diode is connected with the base electrode of the first-stage triode, the collector electrode of the first-stage triode is connected with the base electrode of the second-stage triode through the input side current-limiting resistor, the emitter electrode of the first-stage triode is connected with the cathode of the working power supply, and the collector electrode of the second.
As a preferable mode, in the drive circuit of a single-phase ac motor, the timing synchronization circuit includes: the two input ends of the synchronous photoelectric isolation circuit are connected in series into an alternating current power supply loop through an alternating current limiting resistor, a power supply pin at the receiving side of the photoelectric isolation circuit is connected with a working power supply through a pull-up resistor, and an output pin at the receiving side of the photoelectric isolation circuit is connected with a resistor in series to form an output end to output a synchronous timing signal.
Preferably, in the driving circuit of a single-phase ac motor, the timing synchronization circuit further includes: the anode of the power side diode and the cathode of the grounding side diode are connected with the output end of the receiving side of the photoelectric isolation circuit, the cathode of the power side diode is connected with the anode of the working power supply, and the anode of the grounding side diode is connected with the cathode of the working power supply.
Preferably, in the drive circuit of the single-phase ac motor, a resistor-capacitor snubber circuit is provided between two main electrodes of the triac.
As a preferable mode, in the drive circuit of the single-phase ac motor, the resistance-capacitance absorption circuit includes: and the absorption resistor and the absorption capacitor are connected in series.
Preferably, in the drive circuit of the single-phase ac motor, an anti-interference filter capacitor is provided between one end of the pair of voltage-dividing resistors connected to the positive electrode of the diode and the negative electrode of the operating power supply.
Preferably, in the driving circuit of the single-phase ac motor, the resistance of the power supply side voltage-dividing resistor is three times larger than that of the ground side voltage-dividing resistor.
The utility model has the advantages that: drive circuit simple and practical, the cost is lower, can realize stepless speed regulation to AC motor, because the condition that the electric current is too big and generate heat when having avoided AC motor to start has prolonged AC motor's life, moreover, owing to can start with less rotational speed, then heighten the rotational speed again according to actual conditions for operating personnel and peripheral personnel's personal safety has obtained comparatively reliable guarantee.
Drawings
Fig. 1 is an electrical schematic structure diagram of a driving circuit of a single-phase ac motor according to the present invention.
Detailed Description
The following describes in detail a specific embodiment of a drive circuit of a single-phase ac motor according to the present invention with reference to the accompanying drawings:
as shown in fig. 1, the present invention provides a driving circuit for a single-phase ac motor, including: the operating power VCC5, the bidirectional thyristor Q3 of model BAT41, and the trigger circuit used for controlling the bidirectional thyristor Q3 and the timing synchronization circuit used for synchronizing the trigger circuit, the timing synchronization circuit includes: an optical coupler U2 as a photoelectric isolation circuit for synchronization, a power side diode D7 and a grounding side diode D8, two input pins of the optical coupler U2 are connected in series in an alternating current power supply loop through an alternating current limiting resistor, resistors R11, R12 and R13 are connected in parallel to form a first parallel resistor group, resistors R14, R15 and R16 are connected in parallel to form a second parallel group, the first parallel group and the second parallel group are connected in series to form an alternating current limiting resistor, a power pin on a receiving side of an optical coupler U2 is connected with a working power supply VCC5 through a pull-up resistor R17, an output pin on a receiving side of an optical coupler U2 is connected with a resistor R18 in series to form an output end to output a synchronous timing signal, an output end on a receiving side of the optical coupler U2 is connected with an anode of a power supply side diode D7 and a cathode of a grounding side diode D8, a cathode of the power supply side diode D7 is connected with an anode of the working power supply VCC5, and an anode of the grounding side diode D8 is connected with a cathode of the working power supply VCC 5; the specific structure of the trigger circuit comprises: a pulse width modulation circuit (which belongs to the conventional technology in the field and is not shown in the figure, and can be generated by microprocessing simulation of course) and an optical coupler U1 with the model of MOC3163 as a trigger photoelectric isolation circuit, wherein one output pin of the optical coupler U1 is connected with one main electrode of the bidirectional thyristor Q3 through an output side current limiting resistor R4, the other output pin of the optical coupler U1 is connected with the other main electrode of the bidirectional thyristor Q3 through an output side current limiting resistor R5, and the other output pin of the optical coupler U1 is connected with a gate electrode of the bidirectional thyristor Q3; pulse width modulation circuit's output pin links to each other with opto-coupler U1's control foot, is provided with anti jamming circuit between opto-coupler U1's power foot and working power VCC5, and this anti jamming circuit includes: PNP type secondary triode Q2, NPN type primary triode Q1, diode D1, input side current limiting resistor R3 and a pair of divider resistors, the pair of divider resistors includes: a power supply side divider resistor R1 and a ground side divider resistor R2, wherein the resistance of the power supply side divider resistor R1 is greater than twice the resistance of the ground side divider resistor R2, preferably the resistance of the power supply side divider resistor R1 is greater than three times the resistance of the ground side divider resistor R2 (here, a resistor of 36K Ω is selected as the power supply side divider resistors R1 and R8K Ω is selected as the ground side divider resistor R2), one end of the power supply side divider resistor R1 is connected with one end of the ground side divider resistor R2 and then connected with the anode of the diode D1, the other end of the power supply side divider resistor R1 is connected with the anode of the operating power supply VCC5, the other end of the ground side divider resistor R2 is connected with the cathode of the operating power supply VCC, the cathode of the diode D1 is connected with the base of the first-stage triode Q1, the collector of the first-stage triode Q1 is connected with the base of the second-stage triode Q2 through the input side current-limiting resistor R3, an emitting electrode of the first-stage triode Q1 is connected with a negative electrode of a working power supply VCC5 (commonly called grounding), an emitting electrode of the second-stage triode Q2 is connected with a positive electrode of the working power supply VCC5, and a collecting electrode of the second-stage triode Q2 is connected with a power supply pin of the optocoupler U1. In this embodiment, a resistor-capacitor snubber circuit is disposed between two main electrodes of the triac Q3, and the resistor-capacitor snubber circuit includes: the absorption resistor R6 and the absorption capacitor C2 that are connected together in series, power supply side divider resistor R1 and ground side divider resistor R2 be provided with anti-jamming filter electric capacity C1 between the one end that the positive pole of diode D1 is connected and the negative pole of working power supply VCC 5.
In summary, the present invention is only a preferred embodiment, and is not intended to limit the scope of the present invention, and all equivalent changes and modifications made by the shapes, structures, features and spirit of the claims of the present invention should be included in the scope of the claims of the present invention.
Claims (7)
1. A drive circuit of a single-phase alternating current motor, comprising: working power supply, bidirectional thyristor and be used for controlling bidirectional thyristor's trigger circuit and be used for synchronous trigger circuit's chronogenesis synchronization circuit, its characterized in that, trigger circuit's concrete structure includes: the two output pins of the photoelectric isolation circuit for triggering are respectively connected with the two main electrodes of the bidirectional controllable silicon in a one-to-one correspondence way through output side current limiting resistors, and the gate pole of the bidirectional controllable silicon is connected with the corresponding output pin of the photoelectric isolation circuit for triggering; the output pin of pulse width modulation circuit links to each other with triggering photoelectric isolation circuit's control end, triggers to be provided with anti jamming circuit between photoelectric isolation circuit's power foot and the working power supply, and this anti jamming circuit includes: PNP type's second grade triode, NPN type's first grade triode, diode, input side current limiting resistor and a pair of divider resistance, this pair of divider resistance includes: the power supply side voltage-dividing resistor and the grounding side voltage-dividing resistor are connected, the resistance value of the power supply side voltage-dividing resistor is more than twice of that of the grounding side voltage-dividing resistor, one end of the power supply side voltage-dividing resistor is connected with one end of the grounding side voltage-dividing resistor and then connected with the anode of the diode, the other end of the power supply side voltage-dividing resistor is connected with the anode of the working power supply, the other end of the grounding side voltage-dividing resistor is connected with the cathode of the working power supply, the cathode of the diode is connected with the base electrode of the first-stage triode, the collector electrode of the first-stage triode is connected with the base electrode of the second-stage triode through the input side current-limiting resistor, the emitter electrode of the first-stage triode is connected with the cathode of the working power supply, and the collector electrode of the second.
2. The driving circuit of a single-phase alternating current motor according to claim 1, wherein the timing synchronization circuit comprises: the two input ends of the synchronous photoelectric isolation circuit are connected in series into an alternating current power supply loop through an alternating current limiting resistor, a power supply pin at the receiving side of the photoelectric isolation circuit is connected with a working power supply through a pull-up resistor, and an output pin at the receiving side of the photoelectric isolation circuit is connected with a resistor in series to form an output end to output a synchronous timing signal.
3. The driving circuit of a single-phase ac motor according to claim 1, wherein said timing synchronization circuit further comprises: the anode of the power side diode and the cathode of the grounding side diode are connected with the output end of the receiving side of the photoelectric isolation circuit, the cathode of the power side diode is connected with the anode of the working power supply, and the anode of the grounding side diode is connected with the cathode of the working power supply.
4. A driving circuit of a single-phase ac motor according to claim 1, wherein a resistor-capacitor snubber circuit is provided between two main electrodes of said triac.
5. The driving circuit of a single-phase ac motor according to claim 4, wherein the rc snubber circuit comprises: and the absorption resistor and the absorption capacitor are connected in series.
6. The drive circuit of a single-phase alternating current motor according to claim 1, wherein an anti-interference filter capacitor is provided between one end of the pair of voltage dividing resistors connected to the anode of the diode and the cathode of the operating power supply.
7. A drive circuit of a single-phase alternating current motor according to any one of claims 1 to 6, wherein a resistance value of the power supply side voltage-dividing resistor is more than three times that of the ground side voltage-dividing resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922387047.9U CN211239731U (en) | 2019-12-26 | 2019-12-26 | Drive circuit of single-phase alternating current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922387047.9U CN211239731U (en) | 2019-12-26 | 2019-12-26 | Drive circuit of single-phase alternating current motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211239731U true CN211239731U (en) | 2020-08-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922387047.9U Active CN211239731U (en) | 2019-12-26 | 2019-12-26 | Drive circuit of single-phase alternating current motor |
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| Country | Link |
|---|---|
| CN (1) | CN211239731U (en) |
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2019
- 2019-12-26 CN CN201922387047.9U patent/CN211239731U/en active Active
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