CN107508524B - Motor electricity-saving device capable of reducing harmonic wave - Google Patents

Motor electricity-saving device capable of reducing harmonic wave Download PDF

Info

Publication number
CN107508524B
CN107508524B CN201710903590.2A CN201710903590A CN107508524B CN 107508524 B CN107508524 B CN 107508524B CN 201710903590 A CN201710903590 A CN 201710903590A CN 107508524 B CN107508524 B CN 107508524B
Authority
CN
China
Prior art keywords
triode
motor
current
resistor
diode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201710903590.2A
Other languages
Chinese (zh)
Other versions
CN107508524A (en
Inventor
丁毅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201710903590.2A priority Critical patent/CN107508524B/en
Publication of CN107508524A publication Critical patent/CN107508524A/en
Application granted granted Critical
Publication of CN107508524B publication Critical patent/CN107508524B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
    • H02P1/42—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor
    • H02P1/423—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor by using means to limit the current in the main winding
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/26—Power factor control [PFC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/04—Single phase motors, e.g. capacitor motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/24—Variable impedance in stator or rotor circuit
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

Abstract

A motor electricity-saving device achieves the purpose of saving electricity by adjusting the current of a motor. The motor current regulator comprises a phase detection circuit and a current control circuit for regulating the motor current according to the detected phase signal, and the principle is that when the load of the motor is increased in the running process, the current control circuit increases the motor current, and when the load is reduced, the current control circuit decreases the motor current, and the motor current regulator does not adopt a silicon controlled rectifier, but regulates the motor current through a bridge rectifier QL and a triode T3, so that the terminal voltage waveform of the motor is continuous, the higher harmonic wave is greatly weakened, and the pollution to a power grid is small; the electricity-saving device can save electricity by about 20 percent.

Description

Motor electricity-saving device capable of reducing harmonic wave
Technical Field
The invention relates to a motor electricity-saving device, which achieves the purpose of saving electricity by adjusting the current of a motor.
Background
When the motor runs below rated load, the power factor of the motor is reduced, the efficiency of the motor is lower, and the waste of electric energy is caused. In order to achieve the purpose of saving electricity, the terminal voltage of the motor is regulated by a thyristor according to the size of the load, and curve 3 in fig. 2 is a waveform of the terminal voltage of the motor after the thyristor is regulated, so as to improve the power factor by reducing the terminal voltage of the motor. The disadvantage of using a silicon controlled rectifier is that higher harmonics can be generated to pollute the power grid; in order to eliminate the influence of higher harmonic waves, a filter circuit is needed, and the manufacturing cost of the power saver is increased.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a motor electricity saver capable of reducing harmonic waves, the voltage waveform output by the electricity saver is continuous, and the harmonic wave components are greatly reduced.
The technical scheme of the invention is that the motor electricity-saving device capable of reducing harmonic wave comprises a phase detection circuit, a current control circuit for automatically adjusting motor current according to a detected phase signal and a starting circuit of the motor electricity-saving device;
the phase detection circuit comprises a current transformer LH and a step-down transformer B1, wherein a primary coil of the current transformer LH is connected in series in a current loop of the motor MD, one end of a secondary coil of the current transformer LH is connected with a base electrode of a triode T1, the other end of the secondary coil of the current transformer LH is connected with a base electrode of a triode T2, one end of a resistor R1 is connected with a center tap of the secondary coil of the current transformer LH, and the other end of the resistor R1 is connected with an emitter electrode of the triode T1 and an emitter electrode of the triode T2; the primary coil of the step-down transformer B1 is connected with a mains supply in parallel, one end of the secondary coil of the step-down transformer B1 is connected with the collector of the triode T1, the other end of the secondary coil of the step-down transformer B1 is connected with the collector of the triode T2, the center tap of the secondary coil of the step-down transformer B1 is connected with the emitter of the triode T1 and the emitter of the triode T2 through a resistor R2, and the center tap of the secondary coil of the step-down transformer B1 is grounded;
the current control circuit structure is that one end of a resistor R3 is connected with an emitter of a triode T1, the other end of the resistor R3 is grounded through a potentiometer W1, the other end of the resistor R3 is grounded through a capacitor C1, a sliding arm of the potentiometer W1 is connected with a base electrode of the triode T3 through a resistor R4, and the emitter of the triode T3 is grounded; the input end of the bridge rectifier QL is connected in series in a current loop of the motor, the positive electrode of the output end of the bridge rectifier QL is connected with the collector electrode of the triode T3, and the negative electrode of the output end of the bridge rectifier QL is grounded.
Compared with the prior art, the power-saving device does not adopt a controllable silicon, but adjusts the current of the motor through the bridge rectifier QL and the triode T3, so that the terminal voltage waveform of the motor is continuous, higher harmonic waves are greatly weakened, and the pollution to a power grid is small; the electricity-saving device can save electricity by about 20 percent.
Drawings
Fig. 1 is a schematic diagram of the circuit of the present invention.
Fig. 2 is a waveform diagram of a motor terminal voltage.
Detailed Description
Specific embodiments of the present invention will now be described with reference to the accompanying drawings.
A motor electricity-saving device capable of reducing harmonic wave is matched with a single-phase alternating current motor for use, and comprises a phase detection circuit, a current control circuit for automatically adjusting motor current according to detected phase signals and a starting circuit of the motor electricity-saving device.
The phase detection circuit comprises a current transformer LH, a step-down transformer B1, a triode T2, a resistor R1 and a resistor R2, wherein a primary coil of the current transformer LH is connected in series in a current loop of a motor MD, one end of a secondary coil of the current transformer LH is connected with a base electrode of the triode T1, the other end of the secondary coil of the current transformer LH is connected with a base electrode of the triode T2, one end of the resistor R1 is connected with a center tap of the secondary coil of the current transformer LH, and the other end of the resistor R1 is connected with an emitter electrode of the triode T1 and an emitter electrode of the triode T2; the primary coil of the step-down transformer B1 is connected in parallel with a power supply ua of the motor, one end of a secondary coil of the step-down transformer B1 is connected with a collector of the triode T1, the other end of the secondary coil of the step-down transformer B1 is connected with a collector of the triode T2, a center tap of the secondary coil of the step-down transformer B1 is connected with an emitter of the triode T1 and an emitter of the triode T2 through a resistor R2, and the center tap of the secondary coil of the step-down transformer B1 is grounded.
The principle of the phase detection circuit is that the voltage signal of the secondary coil of the current transformer LH is in phase with the current ia in the current loop of the motor MD, and the power supply voltage ua of the secondary coil of the step-down transformer B1 is in phase; when the voltage polarity of one end of the secondary coil of the current transformer LH and the voltage polarity of one end of the secondary coil of the step-down transformer B1 are both positive, the collector of the triode T1 generates current, and similarly when the voltage polarity of the other end of the secondary coil of the current transformer LH and the voltage polarity of the other end of the secondary coil of the step-down transformer B1 are both positive, the collector of the triode T2 generates current; collector current of the triode T1 and collector current of the triode T2 form phase signal voltage on the resistor R2; when the power factor decreases (i.e. the load is small) during operation of the motor, the phase difference between the supply voltage ua and the current ia increases and the phase signal voltage decreases and vice versa.
The current control circuit comprises a bridge rectifier QL, a triode T3, a resistor R3, a potentiometer W1 and a capacitor C1, wherein the emitter of the triode T1 is connected with one end of the resistor R3, the other end of the resistor R3 is grounded through the potentiometer W1, the other end of the resistor R3 is grounded through the capacitor C1, a sliding arm of the potentiometer W1 is connected with the base electrode of the triode T3 through a resistor R4, and the emitter of the triode T3 is grounded; the input end of the bridge rectifier QL is connected in series in a current loop of the motor, the positive electrode of the output end of the bridge rectifier QL is connected with the collector electrode of the triode T3, and the negative electrode of the output end of the bridge rectifier QL is grounded.
The working principle of the current control circuit is that a resistor R3 and a capacitor C1 filter a phase signal, a potentiometer W1 is used for setting a power factor when the motor operates, when the power factor is reduced in the motor operation process, the voltage of the phase signal is correspondingly reduced, the collector current of a triode T3 is reduced, namely, the current of the motor is reduced, and the power factor is increased. The phase signal voltage cannot approach zero regardless of the power factor change, so that the transistor T3 cannot be turned off, and the waveform of the motor terminal voltage is always continuous.
Curve 1 of fig. 2 is a waveform (power factor is maximum) of a motor terminal voltage during rated load operation of the motor, and the transistor T3 is in a saturated conduction state; curve 2 of fig. 2 shows the waveform of the motor terminal voltage when the motor is operated under a small load, and the transistor T3 is in an amplified regulation state; curve 3 in fig. 2 is a waveform of the motor terminal voltage after the motor is regulated by the silicon controlled rectifier during the small load operation, the motor terminal voltage waveform has a gap, and the higher harmonic component is larger; while the voltage waveform of the curve 2 is continuous and is close to the waveform of a sine fundamental wave, and the higher harmonic component is greatly reduced.
The starting circuit of the motor power saver can be composed of a button, one end of the button is connected with the positive electrode of the output end of the bridge rectifier QL, and the other end of the button is connected with the sliding arm of the potentiometer W1; when the power saver of the motor is started, the button is pressed down and then loosened; at the moment that the button is pressed, the positive electrode of the output end of the rectifier QL provides base voltage for the triode T3, so that the triode T3 is conducted, a current transformer passes current, a phase detection circuit generates a phase signal, and the power saver enters a normal working state after the button is loosened.
The starting circuit of the motor power saver can also adopt another structure, namely the starting circuit of the motor power saver comprises a diode D1, a diode D2 and a capacitor C2, wherein the diode D2 is connected between a resistor R4 and a sliding arm of a potentiometer W1 in series, the anode of the diode D2 is connected with the sliding arm of the potentiometer W1, the cathode of the diode D2 is connected with the resistor R4, the anode of the diode D1 is connected with the anode of the output end of a bridge rectifier QL, the cathode of the diode D1 is connected with one end of the capacitor C2, and the other end of the capacitor C2 is connected with the cathode of the diode D2. When the motor current loop is connected with the power supply ua, the triode T3 is in a cut-off state, the positive electrode of the output end of the bridge rectifier QL supplies base current to the triode T3 through the diode D1, the capacitor C2 and the resistor R4, as long as the charging time constant formed by the capacitor C2 and the resistor R4 is more than 20 milliseconds (namely the change period of the alternating current power supply), the current transformer has current to pass through, so that the phase detection circuit generates a phase signal, and almost no charging current enters the base electrode of the triode T3 after the capacitor charging is finished, and the motor electricity saver enters a normal working state.

Claims (1)

1. A motor electricity-saving device capable of reducing harmonic wave comprises a phase detection circuit, a current control circuit for adjusting motor current according to detected phase signals and a starting circuit for starting the motor electricity-saving device to work;
the phase detection circuit comprises a current transformer LH and a step-down transformer B1, wherein a primary coil of the current transformer LH is connected in series in a current loop of the motor MD, one end of a secondary coil of the current transformer LH is connected with a base electrode of a triode T1, the other end of the secondary coil of the current transformer LH is connected with a base electrode of a triode T2, one end of a resistor R1 is connected with a center tap of the secondary coil of the current transformer LH, and the other end of the resistor R1 is connected with an emitter electrode of the triode T1 and an emitter electrode of the triode T2; the primary coil of the step-down transformer B1 is connected with a mains supply in parallel, one end of the secondary coil of the step-down transformer B1 is connected with the collector of the triode T1, the other end of the secondary coil of the step-down transformer B1 is connected with the collector of the triode T2, the center tap of the secondary coil of the step-down transformer B1 is connected with the emitter of the triode T1 and the emitter of the triode T2 through a resistor R2, and the center tap of the secondary coil of the step-down transformer B1 is grounded;
the current control circuit structure is that one end of a resistor R3 is connected with an emitter of a triode T1, the other end of the resistor R3 is grounded through a potentiometer W1, the other end of the resistor R3 is grounded through a capacitor C1, a sliding arm of the potentiometer W1 is connected with a base electrode of the triode T3 through a resistor R4, and the emitter of the triode T3 is grounded; the input end of the bridge rectifier QL is connected in series in a current loop of the motor, the positive electrode of the output end of the bridge rectifier QL is connected with the collector electrode of the triode T3, and the negative electrode of the output end of the bridge rectifier QL is grounded;
the starting circuit of the motor power saver comprises a diode D1, a diode D2 and a capacitor C2, wherein the diode D2 is connected in series between a resistor R4 and a sliding arm of a potentiometer W1, the anode of the diode D2 is connected with the sliding arm of the potentiometer W1, the cathode of the diode D2 is connected with the resistor R4, the anode of the diode D1 is connected with the anode of the output end of a bridge rectifier QL, the cathode of the diode D1 is connected with one end of the capacitor C2, and the other end of the capacitor C2 is connected with the cathode of the diode D2; wherein the charge time constant formed by the capacitor C2 and the resistor R4 is more than 20 milliseconds.
CN201710903590.2A 2017-09-29 2017-09-29 Motor electricity-saving device capable of reducing harmonic wave Active CN107508524B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710903590.2A CN107508524B (en) 2017-09-29 2017-09-29 Motor electricity-saving device capable of reducing harmonic wave

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710903590.2A CN107508524B (en) 2017-09-29 2017-09-29 Motor electricity-saving device capable of reducing harmonic wave

Publications (2)

Publication Number Publication Date
CN107508524A CN107508524A (en) 2017-12-22
CN107508524B true CN107508524B (en) 2023-05-30

Family

ID=60699843

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710903590.2A Active CN107508524B (en) 2017-09-29 2017-09-29 Motor electricity-saving device capable of reducing harmonic wave

Country Status (1)

Country Link
CN (1) CN107508524B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1151347A (en) * 1966-08-24 1969-05-07 Kh Politekhn I Im Apparatus for Converting Electrical Power into Pulse Current
CN86206609U (en) * 1986-12-22 1987-10-03 上海自动化仪表六厂 Two-way scr voltage regulator
US5003242A (en) * 1985-03-01 1991-03-26 Square D Company Reduced voltage starter
CN2614401Y (en) * 2003-04-23 2004-05-05 邝旭兵 Energy saving controller for three-phase motor
CN2711985Y (en) * 2004-06-17 2005-07-20 付廷福 Single phase motor energy saving device for refrigerator, freezer and air conditioner
CN207200608U (en) * 2017-09-29 2018-04-06 丁毅 The electric motor electricity saver of harmonic wave can be reduced

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1151347A (en) * 1966-08-24 1969-05-07 Kh Politekhn I Im Apparatus for Converting Electrical Power into Pulse Current
US5003242A (en) * 1985-03-01 1991-03-26 Square D Company Reduced voltage starter
CN86206609U (en) * 1986-12-22 1987-10-03 上海自动化仪表六厂 Two-way scr voltage regulator
CN2614401Y (en) * 2003-04-23 2004-05-05 邝旭兵 Energy saving controller for three-phase motor
CN2711985Y (en) * 2004-06-17 2005-07-20 付廷福 Single phase motor energy saving device for refrigerator, freezer and air conditioner
CN207200608U (en) * 2017-09-29 2018-04-06 丁毅 The electric motor electricity saver of harmonic wave can be reduced

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
张儒斌.一种新型电焊机节电控制器.电子世界.1995,(第09期),全文. *

Also Published As

Publication number Publication date
CN107508524A (en) 2017-12-22

Similar Documents

Publication Publication Date Title
EP2804287B1 (en) Charger and charging system
CN102163871B (en) Multi-power supply system and method
CN205792229U (en) Large-power occasions high-power factor DC power supply in one
CN203039590U (en) Numerically-controlled voltage-regulating high-voltage direct current power supply
CN102035379A (en) Dc-dc converter
EP2555398A1 (en) Power supply circuit with low-voltage control and producing method thereof
CN102081419B (en) Automatic voltage regulating circuit and method for solar photovoltaic power generation system
CN104184396A (en) Photovoltaic power supply system and control method thereof
CN102554441B (en) Constant-current control device for welding power source of medium-frequency inverter resistance electric welding machine and control method for welding power source
CN203775041U (en) Alternating-current power source based on dual voltage rectifying and BOOST circuits
CN203872061U (en) Small type high-voltage power module capable of rapidly discharging and continuously adjusting voltage
CN107508524B (en) Motor electricity-saving device capable of reducing harmonic wave
CN2847684Y (en) Energy saving type AC voltage stabilizer
CN104484004B (en) The control device of a kind of on line type UPS and on line type UPS
CN107425777B (en) Current-regulating motor electricity-saving device
CN203299563U (en) Low-power-consumption standby circuit and air-conditioner including same
CN102487199B (en) Soft switching grid-connected inverter
CN107437915B (en) Double-inductance type motor power-saving controller
CN107404275B (en) Variable inductance type motor power-saving controller
CN204068742U (en) Low-power power adapter drive circuit
CN207200608U (en) The electric motor electricity saver of harmonic wave can be reduced
CN103427481A (en) Topological circuit for uninterruptible power supply
CN207166392U (en) Become sense formula electricity-saving controller for electric motor
CN105071456A (en) Solar power supply control system
CN2593463Y (en) Power-saving apparatus

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant