CN203491679U - Open-phase discriminating and protection circuit of three-phase power supply - Google Patents
Open-phase discriminating and protection circuit of three-phase power supply Download PDFInfo
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- CN203491679U CN203491679U CN201320633088.1U CN201320633088U CN203491679U CN 203491679 U CN203491679 U CN 203491679U CN 201320633088 U CN201320633088 U CN 201320633088U CN 203491679 U CN203491679 U CN 203491679U
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- motor
- protection circuit
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Abstract
The utility model relates to an open-phase discriminating and protection circuit of a three-phase power supply, and belongs to the technical field of discriminating and protection circuit devices. The technical scheme is that the open-phase discriminating and protection circuit comprises an open-phase protection unit (11), a three-phase power supply input device (12) and a motor (13), the three-phase power supply input device (12), the open-phase protection unit (11) and the motor (13) are sequentially connected, and the open-phase protection unit (11) comprises a comparator, a diode and a resistor. The beneficial effects of the open-phase discriminating and protection circuit are that a stabilized voltage supply or temperature detection or a current transformer is not necessary, power supply phase sequence detection is not necessary, the open-phase discriminating and protection circuit determines the input voltage only through the comparator, by means of the change of the output waveform, whether the power supply is in an open-phase state is determined, the output is controlled, and the open-phase discriminating and protection circuit is simple and effective.
Description
Technical field
The utility model relates to a kind of open phases of three-phase power source to be differentiated and protective circuit, belongs to and differentiates and protective circuit device technique field.
Background technology
During threephase asynchronous open-phase running, the stator of motor, the temperature rise of rotor all will increase severely, and will make motor be subject to serious infringement.Not only impact is produced, and even can cause the accident and cause heavy economic losses.
DC speed-regulating motor equally also needs the open-phase protection of power supply; when there is phase shortage in power supply; can make that three-phase current is unbalanced or electric current is excessive; the operation of DC speed-regulating motor underpower or shutdown; although can motor damage and controller; but the phase shortage of three phase mains can cause output power of motor to reduce or motor cannot start, and to production, causes great loss.
Utility model content
The utility model object is to provide a kind of open phases of three-phase power source and differentiates and protective circuit, by comparator, input voltage is judged, controls output, solves the problems referred to above that exist in background technology.
The technical solution of the utility model is: a kind of open phases of three-phase power source is differentiated and protective circuit; comprise phase-lacking protective unit, three phase mains input equipment and motor; described three phase mains input equipment, phase-lacking protective unit are connected successively with motor, and phase-lacking protective unit comprises comparator, diode and resistance.
Also comprise normally closed relay, normally opened relay, start button and stop button; described three phase mains input equipment, stop button, normally closed relay, start button, normally opened relay are connected successively with motor; the input of phase-lacking protective unit and three phase mains input equipment are connected to each other, and output and normally closed relay are connected to each other.
Also comprise normally closed relay, speed-regulating motor controller and buncher driver; described three phase mains input equipment, buncher driver are connected successively with motor; phase-lacking protective unit and speed-regulating motor controller are connected to each other, and by normally closed relay, are arranged between three phase mains input equipment and buncher driver.
The beneficial effects of the utility model are: do not need stabilized voltage power supply and temperature detection or Current Mutual Inductance to answer device, more needn't detect power phase, only need to input voltage, judge by comparator, change output waveform, thereby judge whether phase shortage of power supply, and control output, simple and effective.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is the schematic diagram of the discriminating of the utility model threephase asynchronous machine phase shortage and protective circuit;
Fig. 3 is that the utility model exchanges or DC speed-regulating motor phase shortage is differentiated and the schematic diagram of protective circuit;
In figure: phase-lacking protective unit 11; Three phase mains input equipment 12; Motor 13; Normally closed relay 14; Normally opened relay 15; Start button 16; Stop button 17; Speed-regulating motor controller 18; Buncher driver 19.
Embodiment
Below in conjunction with accompanying drawing, by embodiment, the utility model is described in further detail.
A kind of open phases of three-phase power source is differentiated and protective circuit; comprise phase-lacking protective unit 11, three phase mains input equipment 12 and motor 13; described three phase mains input equipment 12, phase-lacking protective unit 11 and motor 13 are connected successively, and phase-lacking protective unit 11 comprises comparator, diode and resistance.
Also comprise normally closed relay 14, normally opened relay 15, start button 16 and stop button 17; described three phase mains input equipment 12, stop button 17, normally closed relay 14, start button 16, normally opened relay 15 and motor 13 are connected successively; the input of phase-lacking protective unit 11 and three phase mains input equipment 12 are connected to each other, and output and normally closed relay 14 are connected to each other.
Also comprise normally closed relay 14, speed-regulating motor controller 18 and buncher driver 19; described three phase mains input equipment 12, buncher driver 19 and motor 13 are connected successively; phase-lacking protective unit 11 and speed-regulating motor controller 18 are connected to each other, and by normally closed relay 14, are arranged between three phase mains input equipment 12 and buncher driver 19.
The operation principle of phase-lacking protective unit: when power phase shortage, 7 pins of comparator LM258 are output as negative, now optocoupler 4N33 cut-off, output, does not make motor out of service.
Between two comparison modules of above-mentioned comparator LM258, with diode 1N4007, connect.
The input voltage of 3 pins of above-mentioned comparator LM258 by resistance R 3 minutes supply voltage provides
, the input of 2 pins provides 12V voltage by voltage-stabiliser tube on circuit board.
6 pin of above-mentioned comparator LM258 are equally 12V voltage with 2 pin, and the input terminal voltage of 5 pins of comparator LM258 is determined by the 1 pin output voltage of comparator LM258.
When three phase mains is normally worked, 1 pin of comparator LM258 is just output as, diode 1N4007 cut-off, and now the input voltage of 5 pins of comparator LM258 is provided by 24V stabilized voltage power supply, 7 pin output high level, optocoupler 4N33 normally works, and produces output.
When open phases of three-phase power source, 1 pin of comparator LM258 is output as negative, diode 1N4007 conducting, and now the input voltage of 5 pins of comparator LM258 is negative, 7 pin output low levels, optocoupler 4N33 cut-off, not output.
In the application of threephase asynchronous power phase shortage protection; press start button 16 and make normally opened relay 15 closures; now normally closed relay 14 forms complete loops with normally opened relay 15, threephase asynchronous machine is started and move, and when needs motor is out of service, only need press stop button 17.If motor when operation power supply is inputted when normal, phase shortage discriminator circuit is output as high voltage, once power supply, occur that phase shortage power supply discriminator circuit is output as low level, make normally closed relay 14 energising cut-off switch, now normally opened relay 15, normally closed relay 14 can not form loop and make normally opened relay 15 power-off and cut-off switch, motor is out of service, prevents that motor from damaging owing to being operated under the state of phase shortage.
In interchange or DC speed-regulating motor power phase shortage protection application, between speed-regulating motor controller and power supply, add phase shortage discriminator circuit, make the output signal of discriminator circuit input to speed-regulating motor controller.When power supply, input when normal, discriminator circuit is output as direct current ripple; When power supply generation phase shortage, discriminator circuit output becomes PWM(pulse width modulation) waveform.The difference that speed-regulating motor controller is inputted waveform by judgement changes the control to drive circuit, thereby reaches the object of controlling motor.When can turn-off normally closed relay 14 by controller like this when power supply lacuna occurs, drive circuit is turn-offed, make motor out of service, thereby protection motor is avoided the damage bringing due to power phase shortage.
Claims (3)
1. an open phases of three-phase power source is differentiated and protective circuit; it is characterized in that: comprise phase-lacking protective unit (11), three phase mains input equipment (12) and motor (13); described three phase mains input equipment (12), phase-lacking protective unit (11) and motor (13) are connected successively, and phase-lacking protective unit (11) comprises comparator, diode and resistance.
2. a kind of open phases of three-phase power source according to claim 1 is differentiated and protective circuit; it is characterized in that: also comprise normally closed relay (14), normally opened relay (15), start button (16) and stop button (17); described three phase mains input equipment (12), stop button (17), normally closed relay (14), start button (16), normally opened relay (15) and motor (13) are connected successively; the input of phase-lacking protective unit (11) and three phase mains input equipment (12) are connected to each other, and output and normally closed relay (14) are connected to each other.
3. a kind of open phases of three-phase power source according to claim 1 is differentiated and protective circuit; it is characterized in that: also comprise normally closed relay (14), speed-regulating motor controller (18) and buncher driver (19); described three phase mains input equipment (12), buncher driver (19) and motor (13) are connected successively; phase-lacking protective unit (11) and speed-regulating motor controller (18) are connected to each other, and by normally closed relay (14), are arranged between three phase mains input equipment (12) and buncher driver (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320633088.1U CN203491679U (en) | 2013-10-15 | 2013-10-15 | Open-phase discriminating and protection circuit of three-phase power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320633088.1U CN203491679U (en) | 2013-10-15 | 2013-10-15 | Open-phase discriminating and protection circuit of three-phase power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203491679U true CN203491679U (en) | 2014-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320633088.1U Expired - Fee Related CN203491679U (en) | 2013-10-15 | 2013-10-15 | Open-phase discriminating and protection circuit of three-phase power supply |
Country Status (1)
| Country | Link |
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| CN (1) | CN203491679U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111381162A (en) * | 2018-12-27 | 2020-07-07 | 罗伯特·博世有限公司 | Determining an interrupted motor phase of an electric motor |
-
2013
- 2013-10-15 CN CN201320633088.1U patent/CN203491679U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111381162A (en) * | 2018-12-27 | 2020-07-07 | 罗伯特·博世有限公司 | Determining an interrupted motor phase of an electric motor |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140319 Termination date: 20161015 |
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| CF01 | Termination of patent right due to non-payment of annual fee |