CN111049105A - Control circuit of single-phase alternating current motor - Google Patents

Control circuit of single-phase alternating current motor Download PDF

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Publication number
CN111049105A
CN111049105A CN201911369461.5A CN201911369461A CN111049105A CN 111049105 A CN111049105 A CN 111049105A CN 201911369461 A CN201911369461 A CN 201911369461A CN 111049105 A CN111049105 A CN 111049105A
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CN
China
Prior art keywords
circuit
resistor
power supply
diode
voltage
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Pending
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CN201911369461.5A
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Chinese (zh)
Inventor
宋高军
王建东
周健
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Zhangjiagang Uchen New Energy Co ltd
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Zhangjiagang Uchen New Energy Co ltd
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Priority to CN201911369461.5A priority Critical patent/CN111049105A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/0822—Integrated protection, motor control centres
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H02H7/0852—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load directly responsive to abnormal temperature by using a temperature sensor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption

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  • Control Of Ac Motors In General (AREA)

Abstract

The invention discloses a control circuit of a single-phase alternating current motor, which can adjust the rotating speed of the single-phase alternating current motor and carry out omnibearing protection on the single-phase alternating current motor, and comprises the following components: 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. The control circuit can be widely applied to various single-phase alternating current motors.

Description

Control circuit of single-phase alternating current motor
Technical Field
The present invention relates to a control circuit for an ac motor, and more particularly, to a control 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. 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.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: 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 problems, the invention adopts the technical scheme that: 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 invention has the beneficial effects that: the control circuit is simple and practical, has lower cost, can realize stepless speed regulation on 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 ensures that the personal safety of operators and peripheral personnel is reliably ensured because the alternating current motor can be started at a lower rotating speed and then the rotating speed is increased according to the actual condition; in addition, the over-voltage sampling circuit, the under-voltage sampling circuit, the over-temperature sampling circuit and the over-current sampling circuit are arranged to protect the alternating current motor in all directions, so that the alternating current motor cannot be damaged due to sudden abnormity, and the service life of the alternating current motor is greatly prolonged. In addition, the over-voltage sampling circuit, the under-voltage sampling circuit, the over-temperature sampling circuit and the over-current sampling circuit are simple and practical in structure, the cost is greatly reduced, and the market competitiveness is improved.
Drawings
Fig. 1 is an electrical schematic 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.
As shown in fig. 1, a control circuit for a single-phase ac motor according to the present invention includes: working power VCC5, the type is bidirectional thyristor Q3 of BAT41, be used for controlling bidirectional thyristor Q3's trigger circuit, be used for synchronous trigger circuit's chronogenesis synchronous circuit and cross undervoltage sampling circuit, overheat sampling circuit, overflow sampling circuit, chronogenesis synchronous circuit include: 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 are connected in series, and an anti-interference filter capacitor C1 is arranged between one end of the power supply side voltage-dividing resistor R1, the end of the grounding side voltage-dividing resistor R2, which is connected with the anode of the diode D1, and the cathode of the working power supply VCC 5; the over-voltage and under-voltage sampling circuit comprises: a transformer T1 (which is multiplexed with a power supply circuit), a half-wave rectifier diode D3, a charging capacitor C6, an over-voltage and under-voltage output resistor R9, a pull-down resistor R10, an over-voltage and under-voltage output end filter capacitor C8, a power supply side diode D5, a grounding side diode D6, an upper limit voltage-dividing resistor R7 and a lower limit voltage-dividing resistor R8, wherein two ends of a primary coil of the transformer T1 are respectively connected with LIN and NIN of alternating current, a phase Line (LIN) dotted end of a secondary coil of the transformer T1 is connected with an anode of the half-wave rectifier diode D3, a cathode of the half-wave rectifier diode D3 is connected with one end of the upper limit voltage-dividing resistor R7, the other end of the upper limit voltage-dividing resistor R7 is connected with one end of the lower limit voltage-dividing resistor R8 and a corresponding end of the charging capacitor C6, two ends of the charging capacitor C6 are also connected with a charging filter capacitor C7, the other end of the charging, the connecting end of the upper limiting voltage-dividing resistor R7 and the lower limiting voltage-dividing resistor R8 is used as an overvoltage and undervoltage output end and is connected with one end of a pull-down resistor R10, the corresponding end of a filter capacitor C8 of the overvoltage and undervoltage output end, the anode of a power supply side diode D5 and the cathode of a grounding side diode D6, and the other end of the pull-down resistor R10, the other end of the filter capacitor C8 of the overvoltage and undervoltage output end, the cathode of the power supply side diode D5 and the anode of a grounding side diode D6 are grounded; the specific structure of the over-current sampling circuit comprises: a current transformer (not shown in the figure) and a ninth transient diode D9, wherein a ninth filter capacitor C9 and a nineteenth resistor R19 are connected in parallel between two output terminals of the current transformer through a plug CT and a corresponding socket (not shown in the figure), a ground capacitor C10 is arranged at a corresponding end of the current transformer, and is connected in series with an overcurrent output resistor R20 to serve as an overcurrent output terminal, the other end of the current transformer is grounded through a plug TEMP, a cathode of the ninth transient diode D9 is connected with the corresponding end of the current transformer, and an anode of the ninth transient diode D9 is grounded; the specific structure of the overheating sampling circuit comprises: a temperature sensor (not shown in the figures, belonging to the conventional technology in the field) and a tenth transient diode D10, wherein the temperature sensor uses its corresponding end as an overheat output end through a plug TEMP and a corresponding socket (not shown in the figures, belonging to the conventional technology in the field), and connects its other end to ground, the overheat output end D10 is provided with a twenty-first resistor R21 and an eleventh filter capacitor C11 with respect to ground, the cathode of the tenth transient diode D10 is connected with the overheat output end, and the anode of the tenth transient diode D10 is connected to ground.
In summary, the present invention is only a preferred embodiment, and not intended to limit the scope of the invention, and all equivalent changes and modifications made in the shape, structure, characteristics and spirit of the present invention described in the claims should be included in the scope 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.
CN201911369461.5A 2019-12-26 2019-12-26 Control circuit of single-phase alternating current motor Pending CN111049105A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911369461.5A CN111049105A (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
CN201911369461.5A CN111049105A (en) 2019-12-26 2019-12-26 Control circuit of single-phase alternating current motor

Publications (1)

Publication Number Publication Date
CN111049105A true CN111049105A (en) 2020-04-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911369461.5A Pending CN111049105A (en) 2019-12-26 2019-12-26 Control circuit of single-phase alternating current motor

Country Status (1)

Country Link
CN (1) CN111049105A (en)

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