CN211183393U - Control circuit of single-phase alternating current motor - Google Patents
Control circuit of single-phase alternating current motor Download PDFInfo
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- CN211183393U CN211183393U CN201922387131.0U CN201922387131U CN211183393U CN 211183393 U CN211183393 U CN 211183393U CN 201922387131 U CN201922387131 U CN 201922387131U CN 211183393 U CN211183393 U CN 211183393U
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Abstract
The utility model discloses an adjustable single phase alternating current motor rotational speed and can carry out the single phase alternating current motor's of all-round protection control circuit to single phase alternating current motor, include: working power supply, bidirectional thyristor, trigger circuit, chronogenesis synchronous circuit and cross undervoltage sampling circuit, overheated sampling circuit and overcurrent sampling circuit for controlling bidirectional thyristor, this trigger circuit 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, and an anti-interference circuit is arranged between the power pin of the photoelectric isolation circuit for triggering and the working power supply. But control circuit wide application in various single phase alternating current motor.
Description
Technical Field
The utility model relates to an alternating current motor's control circuit especially involves a single phase alternating current motor's control circuit.
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. Therefore, the control circuit is relatively simple, and normally, a fuse (fuse) is provided in series only in the power supply circuit of the ac motor. 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 alternating current motor reaches a faster rated rotating speed instantly, serious potential safety hazards exist for operators and peripheral related personnel; in addition, the control circuit can only protect the overcurrent of the alternating current motor and cannot sense the overvoltage, undervoltage and overheat of the alternating current motor, so that the alternating current motor cannot be protected in an all-around manner, and the service life of the alternating current motor is shortened.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: provided is a control circuit for a single-phase AC motor, which can adjust the rotation speed of the single-phase AC motor and can protect the single-phase AC motor in all directions.
In order to solve the technical problem, the utility model discloses a technical scheme is: a control circuit of a single-phase alternating current motor, the structure of which comprises: working power supply, bidirectional thyristor, be used for controlling bidirectional thyristor's trigger circuit, be used for synchronous trigger circuit's chronogenesis synchronous circuit and cross undervoltage sampling circuit, overheated sampling circuit and overflow sampling circuit, trigger circuit's concrete structure includes: the two output pins of the photoelectric isolation circuit for triggering are respectively connected with 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 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-; the specific structure of the over-voltage and under-voltage sampling circuit comprises: the transformer, a half-wave rectifier diode, a charging capacitor, an over-voltage and under-voltage output resistor, a pull-down resistor, a filter capacitor of an over-voltage and under-voltage output end, a power side diode, a grounding side diode, an upper limiting voltage divider resistor and a lower limiting voltage divider resistor, wherein alternating current is connected to a primary coil of the transformer, the same name end of a phase line of a secondary coil of the transformer is connected with the anode of the half-wave rectifier diode, the cathode of the half-wave rectifier diode is connected with one end of the upper limiting voltage divider resistor, the other end of the upper limiting voltage divider resistor is connected with one end of the lower limiting voltage divider resistor and the corresponding end of the charging capacitor, the other end of the charging capacitor and the other end of the lower limiting voltage divider resistor are grounded, the connected ends of the upper limiting voltage divider resistor and the lower limiting voltage divider resistor are used as over-voltage and under-voltage output ends, one end of the pull-down resistor, the, the other end of the pull-down resistor, the other end of the filter capacitor of the overvoltage and undervoltage output end, the cathode of the power supply side diode and the anode of the grounding side diode are grounded.
As a preferable mode, in the control circuit of the 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.
As a preferable mode, in the control circuit of the single-phase ac motor, the timing synchronization circuit further includes: the photoelectric isolation circuit comprises a power supply side diode and a grounding side diode, wherein the anode of the power supply 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 supply side diode is connected with the anode of a working power supply, and the anode of the grounding side diode is connected with the cathode of the working power supply.
Preferably, in the control circuit of the single-phase ac motor, a resistor-capacitor snubber circuit is provided between two main electrodes of the triac, and the resistor-capacitor snubber circuit includes a snubber resistor and a snubber capacitor connected in series.
Preferably, in the control 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.
As a preferable scheme, in the control circuit of the single-phase ac motor, a specific structure of the overcurrent sampling circuit includes: and a ninth filter capacitor and a nineteenth resistor are connected in parallel between the two output ends of the current transformer, a ground capacitor is arranged at the corresponding end of the current transformer, an overcurrent output resistor is connected in series to serve as an overcurrent output end, and the other end of the current transformer is grounded.
Preferably, in the control circuit of the single-phase ac motor, the control circuit further includes a ninth transient diode, a negative electrode of the ninth transient diode is connected to a corresponding end of the current transformer, and a positive electrode of the ninth transient diode is grounded.
As a preferable mode, in the control circuit of the single-phase ac motor, a specific configuration of the overheat sampling circuit includes: and the corresponding end of the temperature sensor is used as an overheating output end, the other end of the temperature sensor is grounded, and the overheating output end is provided with a twenty-first resistor and an eleventh filter capacitor in a grounded mode.
Preferably, in the control circuit of the single-phase ac motor, the control circuit further includes a tenth transient diode, a cathode of the tenth transient diode is connected to the overheat output terminal, and an anode of the tenth transient diode is grounded.
Preferably, in the control circuit of the single-phase ac motor, a charging filter capacitor is further connected in parallel to both ends of the charging capacitor.
The utility model has the advantages that: the control circuit of the utility model is simple and practical, has lower cost, can realize stepless speed regulation for the alternating current motor, avoids the condition that the alternating current motor generates heat due to overlarge current when being started, prolongs the service life of the alternating current motor, and can start at a lower rotating speed and then increase the rotating speed according to the actual condition, so that the personal safety of operators and peripheral personnel is reliably ensured; furthermore, the utility model discloses a set up, under-voltage sampling circuit, overheated sampling circuit and overflow sampling circuit, right alternating current motor carry out all-round protection for alternating current motor can not damage because of proruption is unusual, has prolonged alternating current motor's life greatly. Additionally, the utility model discloses the simple structure practicality of crossing, under-voltage sampling circuit, overheated sampling circuit and overflowing sampling circuit that adopts has reduced the cost by a wide margin, has increased market competition.
Drawings
Fig. 1 is an electrical schematic structure diagram of a control circuit of a single-phase ac motor according to the present invention.
Detailed Description
The following describes a specific embodiment of a control circuit of a single-phase ac motor according to the present invention in detail with reference to the accompanying drawings.
The control circuit of the single-phase alternating current motor comprises a working power supply VCC, a bidirectional thyristor Q with a BAT type, a trigger circuit for controlling the bidirectional thyristor Q, a time sequence synchronous circuit for a synchronous trigger circuit, an over-under-voltage sampling circuit, an over-temperature sampling circuit, an over-current sampling circuit, an over-voltage sampling circuit, an over-current sampling circuit, a time sequence synchronous circuit, a power supply side diode, a power supply side, a collector, a resistor, a diode, a resistor, a diode, a resistor, a diode, a resistor, a diode, a resistor, a diode, a resistor, a diode, a resistor, a diode, a resistor, a diode, a resistor, a diode, a resistor, a diode, a resistor, a diode, a.
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 (10)
1. A control circuit for a single-phase ac motor, comprising: working power supply, bidirectional thyristor, be used for controlling bidirectional thyristor's trigger circuit, be used for synchronous trigger circuit's chronogenesis synchronous circuit and cross undervoltage sampling circuit, overheated sampling circuit and overflow sampling 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 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 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-; the specific structure of the over-voltage and under-voltage sampling circuit comprises: the transformer, a half-wave rectifier diode, a charging capacitor, an over-voltage and under-voltage output resistor, a pull-down resistor, a filter capacitor of an over-voltage and under-voltage output end, a power side diode, a grounding side diode, an upper limiting voltage divider resistor and a lower limiting voltage divider resistor, wherein alternating current is connected to a primary coil of the transformer, the same name end of a phase line of a secondary coil of the transformer is connected with the anode of the half-wave rectifier diode, the cathode of the half-wave rectifier diode is connected with one end of the upper limiting voltage divider resistor, the other end of the upper limiting voltage divider resistor is connected with one end of the lower limiting voltage divider resistor and the corresponding end of the charging capacitor, the other end of the charging capacitor and the other end of the lower limiting voltage divider resistor are grounded, the connected ends of the upper limiting voltage divider resistor and the lower limiting voltage divider resistor are used as over-voltage and under-voltage output ends, one end of the pull-down resistor, the, the other end of the pull-down resistor, the other end of the filter capacitor of the overvoltage and undervoltage output end, the cathode of the power supply side diode and the anode of the grounding side diode are grounded.
2. The control circuit of a single-phase ac motor according to claim 1, wherein said 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 control circuit of a single-phase ac motor according to claim 1, wherein said timing synchronization circuit further comprises: the photoelectric isolation circuit comprises a power supply side diode and a grounding side diode, wherein the anode of the power supply 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 supply side diode is connected with the anode of a working power supply, and the anode of the grounding side diode is connected with the cathode of the working power supply.
4. The control circuit of a single-phase alternating-current motor according to claim 1, wherein a resistor-capacitor absorption circuit is provided between two main electrodes of the triac, and the resistor-capacitor absorption circuit includes an absorption resistor and an absorption capacitor connected in series.
5. The control 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.
6. The control circuit of the single-phase alternating current motor according to any one of claims 1 to 5, wherein the overcurrent sampling circuit has a specific structure including: and a ninth filter capacitor and a nineteenth resistor are connected in parallel between the two output ends of the current transformer, a ground capacitor is arranged at the corresponding end of the current transformer, an overcurrent output resistor is connected in series to serve as an overcurrent output end, and the other end of the current transformer is grounded.
7. The control circuit of a single-phase alternating current motor according to claim 6, wherein the control circuit further comprises a ninth transient diode, a cathode of the ninth transient diode is connected to a corresponding end of the current transformer, and an anode of the ninth transient diode is grounded.
8. The control circuit of the single-phase alternating current motor according to any one of claims 1 to 5, wherein the specific structure of the overheat sampling circuit includes: and the corresponding end of the temperature sensor is used as an overheating output end, the other end of the temperature sensor is grounded, and the overheating output end is provided with a twenty-first resistor and an eleventh filter capacitor in a grounded mode.
9. The control circuit of a single-phase ac motor of claim 8, further comprising a tenth transient diode, wherein a cathode of the tenth transient diode is connected to said overheat output terminal, and an anode of the tenth transient diode is connected to ground.
10. The control circuit of a single-phase alternating current motor according to any one of claims 1 to 5, wherein a charge filter capacitor is further connected in parallel to both ends of the charge capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922387131.0U CN211183393U (en) | 2019-12-26 | 2019-12-26 | Control circuit of single-phase alternating current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922387131.0U CN211183393U (en) | 2019-12-26 | 2019-12-26 | Control circuit of single-phase alternating current motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211183393U true CN211183393U (en) | 2020-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922387131.0U Active CN211183393U (en) | 2019-12-26 | 2019-12-26 | Control circuit of single-phase alternating current motor |
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| Country | Link |
|---|---|
| CN (1) | CN211183393U (en) |
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2019
- 2019-12-26 CN CN201922387131.0U patent/CN211183393U/en active Active
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