CN102005728A - Power protector for three-phase asynchronous motor - Google Patents
Power protector for three-phase asynchronous motorDownload PDFInfo
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- CN102005728A CN102005728ACN2010105614904ACN201010561490ACN102005728ACN 102005728 ACN102005728 ACN 102005728ACN 2010105614904 ACN2010105614904 ACN 2010105614904ACN 201010561490 ACN201010561490 ACN 201010561490ACN 102005728 ACN102005728 ACN 102005728A
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Abstract
Translated fromChineseDescription
Technical field
The present invention relates to a kind of power supply protector, be specifically related to a kind of threephase asynchronous power supply protector, belong to the power detector field.
Background technology
The out of order reason of threephase asynchronous is diversified, but the fault that is caused by power supply is main, according to statistics, in the fault that the asynchronous motor winding burns, cause by the power supply open-phase running more than 70%, the motor that some special occasions uses does not allow the motor counter-rotating, does not promptly allow power supply to connect instead; In addition, the three phase mains imbalance also has a strong impact on the trouble free service of threephase asynchronous, also cannot.For guaranteeing threephase asynchronous safety, working reliably, be necessary to develop a kind of effective power protecting circuit, when problems such as appearance such as three-phase power supply phase sequence connects instead, the phase failure, three-phase mains voltage imbalance, can cut off the electricity supply, play a protective role.At present, power protecting circuit generally adopts current transformer to collect current signal, judge, and these circuit exists complex structure, problem that volume is bigger again, therefore, is necessary to develop a kind of simple in structure, power protecting circuit that volume is little.
Summary of the invention
The object of the present invention is to provide a kind of simple in structure, threephase asynchronous power supply protector that volume is little.
In order to achieve the above object; technical scheme of the present invention is: a kind of threephase asynchronous power supply protector; comprise phase-shift circuit, current rectifying and wave filtering circuit, voltage comparator circuit and block signal output circuit; the output of described phase-shift circuit is electrically connected with the input of current rectifying and wave filtering circuit; the output of current rectifying and wave filtering circuit is electrically connected with the input of voltage comparator circuit, and the output of voltage comparator circuit is electrically connected with the block signal output circuit.
In technique scheme, described phase-shift circuit comprises A phase phase-shift circuit, B phase phase-shift circuit and C phase-shift circuit mutually, and A phase phase-shift circuit is by capacitor C1Constitute, B phase phase-shift circuit is by three resistance R1, R2, R3Series connection constitutes, and C phase phase-shift circuit is by three resistance R4, R5, R6Series connection constitutes, and
, wherein,
Be the angular frequency of three-phase alternating-current supply,
Be capacitor C1Capacitance,
Be capacitor C1Capacitive reactance.
In technique scheme, described current rectifying and wave filtering circuit comprises B commutating phase filter circuit and C commutating phase filter circuit; B commutating phase filter circuit is by diode D1, capacitor C2, capacitor C3And resistance R7, resistance R8Constitute diode D1Negative pole simultaneously and capacitor C2An end, capacitor C3An end and resistance R7An end, resistance R8An end be electrically connected capacitor C2The other end, capacitor C3The other end and resistance R7The equal ground connection of the other end, resistance R8The other end be electrically connected diode D with the input of voltage comparator circuit1Positive pole be electrically connected with the output of phase-shift circuit; C commutating phase filter circuit is by diode D2, capacitor C4, capacitor C5And resistance R9, resistance R10Constitute diode D2Negative pole simultaneously and capacitor C4An end, capacitor C5An end and resistance R9An end, resistance R10An end be electrically connected capacitor C4The other end, capacitor C5The other end and resistance R9The equal ground connection of the other end, resistance R10The other end be electrically connected diode D with the input of voltage comparator circuit2Positive pole be electrically connected with the output of phase-shift circuit.
In technique scheme, the voltage comparator in the described voltage comparator circuit is the LM339 integrated chip,input 4 pin and the resistance R of voltage comparator16An end be electrically connected input 5,6 pin and resistance R15An end be electrically connected input 7 pin and resistance R14An end be electrically connected input 8 pin and resistance R13An end be electrically connected, input 9,10 pin respectively with resistance R12An end be electrically connected input 11 pin and resistance R11An end be electrically connected.
In technique scheme, described block signal output circuit is by four diode D3, D4, D5, D6, two resistance R17, R18, a triode T and a relay J constitute diode D3Positive pole, diode D4Positive pole, diode D5Positive pole, diode D6Positive pole and resistance R17An end all and resistance R18An end be electrically connected diode D3Negative pole, diode D4Negative pole, diode D5Negative pole, diode D6Negative pole be electrically connected resistance R with the corresponding output of voltage comparator circuit respectively17Another termination power, resistance R18The other end be electrically connected with the base stage of triode T, the collector electrode of triode T is electrically connected with an end of relay J, the grounded emitter of triode T, another termination power of relay J.
The invention has the beneficial effects as follows: after adopting said structure; owing to the present invention includes phase-shift circuit; current rectifying and wave filtering circuit; voltage comparator circuit and block signal output circuit; the output of described phase-shift circuit is electrically connected with the input of current rectifying and wave filtering circuit; the output of current rectifying and wave filtering circuit is electrically connected with the input of voltage comparator circuit; the output of voltage comparator circuit is electrically connected with the block signal output circuit; during use; the output of three phase mains is electrically connected with the input of phase-shift circuit; the output of block signal output circuit is electrically connected with the power input of asynchronous motor; three phase mains is behind phase-shift circuit; A; B; change has all taken place in the phase place of C three-phase voltage and size; again through rectifying and wave-filtering; send into voltage comparator circuit; last adhesive or off-state according to the output of relay node; can judge the generation of all phenomena of the failure; when the electrical network normal fluctuation; relay node in the block signal output circuit is in attracting state always; if any power supply breaks down in the three phase mains; power phase is opposite; perhaps phenomenon such as phase failure; all will cause the node of relay to discharge; make relay be in off-state; be that asynchronous motor is in off-position; thereby guarantee that asynchronous motor can safety; work reliably; and the circuit of follow-up asynchronous motor does not need to contact three-phase forceful electric power signal; guarantee the work safety of asynchronous motor and reduce interference other circuit; the present invention not only can be directly as the protector of threephase asynchronous; also can be used as the control assembly of relay contactor; has higher utility; and it is simple in structure; volume is little, is convenient to be installed in the power detector.
Description of drawings
The present invention is further detailed explanation below in conjunction with embodiment that accompanying drawing provides.
Fig. 1 is the block diagram of threephase asynchronous power supply protector of the present invention;
Fig. 2 is the circuit theory diagrams of threephase asynchronous power supply protector of the present invention.
Embodiment
As shown in Figure 1, 2; a kind of threephase asynchronous power supply protector; comprise phase-shift circuit 1, current rectifying andwave filtering circuit 2,voltage comparator circuit 3 and blocksignal output circuit 4; the output of described phase-shift circuit 1 is electrically connected with the input of current rectifying andwave filtering circuit 2; the output of current rectifying andwave filtering circuit 2 is electrically connected with the input ofvoltage comparator circuit 3, and the output ofvoltage comparator circuit 3 is electrically connected with blocksignal output circuit 4.
In technique scheme, as shown in Figure 2, described phase-shift circuit 1 comprises A phase phase-shift circuit 1-1, B phase phase-shift circuit 1-2 and C phase-shift circuit 1-3 mutually, and A phase phase-shift circuit 1-1 is by capacitor C1Constitute, B phase phase-shift circuit 1-2 is by three resistance R1, R2, R3Series connection constitutes, and C phase phase-shift circuit 1-3 is by three resistance R4, R5, R6Series connection constitutes, and
, wherein,
Be the angular frequency of three-phase alternating-current supply,Be capacitor C1Capacitance,
Be capacitor C1Capacitive reactance.
In technique scheme, as shown in Figure 2, described current rectifying andwave filtering circuit 2 comprises B commutating phase filter circuit 2-1 and C commutating phase filter circuit 2-2; B commutating phase filter circuit 2-1 is by diode D1, capacitor C2, capacitor C3And resistance R7, resistance R8Constitute diode D1Negative pole simultaneously and capacitor C2An end, capacitor C3An end and resistance R7An end, resistance R8An end be electrically connected capacitor C2The other end, capacitor C3The other end and resistance R7The equal ground connection of the other end, resistance R8The other end be electrically connected diode D with the input ofvoltage comparator circuit 31Positive pole be electrically connected with the output of phase-shift circuit 1; C commutating phase filter circuit 2-2 is by diode D2, capacitor C4, capacitor C5And resistance R9, resistance R10Constitute diode D2Negative pole simultaneously and capacitor C4An end, capacitor C5An end and resistance R9An end, resistance R10An end be electrically connected capacitor C4The other end, capacitor C5The other end and resistance R9The equal ground connection of the other end, resistance R10The other end be electrically connected diode D with the input ofvoltage comparator circuit 32Positive pole be electrically connected the output of B commutating phase filter circuit 2-1 and the resistance R ofvoltage comparator circuit 4 with the output of phase-shift circuit 112Be electrically connected the output of C commutating phase filter circuit 2-2 and the resistance R ofvoltage comparator circuit 415Be electrically connected.
In technique scheme, as shown in Figure 2, the voltage comparator 3-1 in the describedvoltage comparator circuit 3 is the LM339 integrated chip,input 4 pin and the resistance R of voltage comparator 3-116An end be electrically connected input 5,6 pin and resistance R15An end be electrically connected input 7 pin and resistance R14An end be electrically connected input 8 pin and resistance R13An end be electrically connected, input 9,10 pin respectively with resistance R12An end be electrically connected input 11 pin and resistance R11An end be electrically connected.
In technique scheme, as shown in Figure 2, described blocksignal output circuit 4 is by four diode D3, D4, D5, D6, two resistance R17, R18, a triode T and a relay J constitute diode D3Positive pole, diode D4Positive pole, diode D5Positive pole, diode D6Positive pole and resistance R17An end all and resistance R18An end be electrically connected diode D3Negative pole, diode D4Negative pole, diode D5Negative pole, diode D6Negative pole be electrically connected resistance R withvoltage comparator circuit 3 corresponding outputs respectively17Another termination power, resistance R18The other end be electrically connected with the base stage of triode T, the collector electrode of triode T is electrically connected with an end of relay J, the grounded emitter of triode T, another termination power of relay J,output 1 pin of voltage comparator LM339 integrated chip and the D of blocksignal output circuit 45Be electrically connected the D ofoutput 2 pin and blocksignal output circuit 46Be electrically connected the D of output 13 pin and blocksignal output circuit 44Be electrically connected the D of output 14 pin and blocksignal output circuit 43Be electrically connected.
The present invention gets the resistance R of the B phase phase-shift circuit 1-2 in the phase-shift circuit 1 respectively3With the C resistance R of phase-shift circuit 1-3 mutually6These two ohmically voltages are as three phase mains B phase and C two sampled voltages mutually, the output of two sampled voltages is electrically connected the output U of current rectifying andwave filtering circuit 2 with the input of the B commutating phase filter circuit 2-1 of current rectifying andwave filtering circuit 2 and the input of C commutating phase filter circuit 2-2 respectivelyBIN, UCINRespectively withvoltage comparator circuit 3 in resistance R12, resistance R15Be electrically connected; The power supply ofvoltage comparator circuit 3 and blocksignal output circuit 4 provides the voltage of about 24 V by a direct current power supply, and the voltage comparator in thevoltage comparator circuit 3 is the LM339 integrated chip, and 1 LM339 chip contains 4 voltage comparators.The upper voltage limit of B phase voltage fluctuation is UBH, lower voltage limit is UBLC phase voltage fluctuation upper voltage limit is UCH, lower voltage limit is UCLResistance R in thevoltage comparator circuit 311The upper voltage limit U of another termination B phase voltage fluctuationBH, resistance R13The lower voltage limit U of another termination B phase voltage fluctuationBL, resistance R14The upper voltage limit U of another termination C phase voltage fluctuationCH, resistance R16The lower voltage limit U of another termination C phase voltage fluctuationCLThe voltage U of B phase and C rectification filter circuit output end output mutuallyBINAnd UCINInsert voltage comparator, U through a resistance respectivelyBHSeries resistance R11The in-phase input end of 4# comparator is electrically connected U in back and the LM339 integrated chipBINSeries resistance R12The inverting input of 4# comparator and the in-phase input end of 3# comparator all are electrically connected U in back and the LM339 integrated chipBLSeries resistance R13The inverting input of 3# comparator is electrically connected U in back and the LM339 integrated chipCHSeries resistance R14The in-phase input end of 2# comparator is electrically connected U in back and the LM339 integrated chipCINSeries resistance R15The inverting input of 2# comparator and the in-phase input end of 1# comparator all are electrically connected U in back and the LM339 integrated chipCLSeries resistance R16The back is electrically connected with the inverting input of 1# comparator.When the electrical network normal fluctuation, i.e. UBL＜UBIN＜UBH, and UCL＜UCIN＜UCHThe time, 4 logic levels of LM339 integrated chip output are 1111 here, and have only three-phase mains voltage just often, 4 logic levels of the output ofvoltage comparator circuit 3 output just can be 1111, if when three-phase mains voltage has any fault, exporting 4 logic levels can not be 1111; The output of four voltage comparators of LM339 integrated chip all is electrically connected with the input of blocksignal output circuit 4, promptly output OUTPUT1, the OUTPUT2 of four voltage comparators, OUTPUT3, OUTPUT4 respectively with corresponding diode D6, D5, D3, D4Connect the equal and resistance R in back17Be electrically connected, wherein, four diode D6, D5, D3, D4Anode and resistance R17One end is electrically connected, resistance R17The other end is electrically connected with DC power supply, four diode D6, D5, D3, D4Anode simultaneously also by a resistance R18Be electrically connected with the ground level of a triode T, the emitting stage ground connection of triode T, collector electrode connects an end of a relay J, another termination DC power supply of relay J.When the three phase mains normal fluctuation, promptly during 4 logic levels 1111 of LM339 integrated chip output, the relay node adhesive always of blocksignal output circuit 4, the opposite or phase failure of any power failure or power phase etc., all will make B mutually this moment voltage UBINNot at UBLAnd UBHBetween, perhaps C mutually this moment voltage UCINNot at UCLAnd UCHBetween, thereby cause relay J to discharge, relay J is in off-state, and promptly asynchronous motor is in off-position, thereby guarantees that asynchronous motor can safe and reliable work.
Claims (5)
1. threephase asynchronous power supply protector; it is characterized in that: comprise phase-shift circuit (1), current rectifying and wave filtering circuit (2), voltage comparator circuit (3) and block signal output circuit (4); the output of described phase-shift circuit (1) is electrically connected with the input of current rectifying and wave filtering circuit (2); the output of current rectifying and wave filtering circuit (2) is electrically connected with the input of voltage comparator circuit (3), and the output of voltage comparator circuit (3) is electrically connected with block signal output circuit (4).
2. threephase asynchronous power supply protector according to claim 1; it is characterized in that: described phase-shift circuit (1) comprises A phase phase-shift circuit (1-1), B phase phase-shift circuit (1-2) and C phase-shift circuit (1-3) mutually, and A phase phase-shift circuit (1-1) is by capacitor C1Constitute, B phase phase-shift circuit (1-2) is by three resistance R1, R2, R3Series connection constitutes, and C phase phase-shift circuit (1-3) is by three resistance R4, R5, R6Series connection constitutes, and, wherein,
Be the angular frequency of three-phase alternating-current supply,
Be capacitor C1Capacitance,
Be capacitor C1Capacitive reactance.
3. threephase asynchronous power supply protector according to claim 1 is characterized in that: described current rectifying and wave filtering circuit (2) comprises B commutating phase filter circuit (2-1) and C commutating phase filter circuit (2-2); B commutating phase filter circuit (2-1) is by diode D1, capacitor C2, capacitor C3And resistance R7, resistance R8Constitute diode D1Negative pole simultaneously and capacitor C2An end, capacitor C3An end and resistance R7An end, resistance R8An end be electrically connected capacitor C2The other end, capacitor C3The other end and resistance R7The equal ground connection of the other end, resistance R8The other end be electrically connected diode D with the input of voltage comparator circuit (3)1Positive pole be electrically connected with the output of phase-shift circuit (1); C commutating phase filter circuit (2-2) is by diode D2, capacitor C4, capacitor C5And resistance R9, resistance R10Constitute diode D2Negative pole simultaneously and capacitor C4An end, capacitor C5An end and resistance R9An end, resistance R10An end be electrically connected capacitor C4The other end, capacitor C5The other end and resistance R9The equal ground connection of the other end, resistance R10The other end be electrically connected diode D with the input of voltage comparator circuit (3)2Positive pole be electrically connected with the output of phase-shift circuit (1).
4. threephase asynchronous power supply protector according to claim 1 is characterized in that: the voltage comparator (3-1) in the described voltage comparator circuit (3) is the LM339 integrated chip, input 4 pin and the resistance R of voltage comparator (3-1)16An end be electrically connected input 5,6 pin and resistance R15An end be electrically connected input 7 pin and resistance R14An end be electrically connected input 8 pin and resistance R13An end be electrically connected, input 9,10 pin respectively with resistance R12An end be electrically connected input 11 pin and resistance R11An end be electrically connected.
5. threephase asynchronous power supply protector according to claim 1 is characterized in that: described block signal output circuit (4) is by four diode D3, D4, D5, D6, two resistance R17, R18, a triode T and a relay J constitute diode D3Positive pole, diode D4Positive pole, diode D5Positive pole, diode D6Positive pole and resistance R17An end all and resistance R18An end be electrically connected diode D3Negative pole, diode D4Negative pole, diode D5Negative pole, diode D6Negative pole be electrically connected resistance R with the corresponding output of voltage comparator circuit (3) respectively17Another termination power, resistance R18The other end be electrically connected with the base stage of triode T, the collector electrode of triode T is electrically connected with an end of relay J, the grounded emitter of triode T, another termination power of relay J.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105614904ACN102005728A (en) | 2010-11-28 | 2010-11-28 | Power protector for three-phase asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105614904ACN102005728A (en) | 2010-11-28 | 2010-11-28 | Power protector for three-phase asynchronous motor |
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| Publication Number | Publication Date |
|---|---|
| CN102005728Atrue CN102005728A (en) | 2011-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010105614904APendingCN102005728A (en) | 2010-11-28 | 2010-11-28 | Power protector for three-phase asynchronous motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103631177A (en)* | 2013-09-16 | 2014-03-12 | 华南理工大学 | Direct-current power supply asynchronous parallel digital control system and control method thereof |
| CN106058813A (en)* | 2016-07-08 | 2016-10-26 | 国家电网公司 | Three-phase asynchronous motor power supply protection apparatus |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2062914U (en)* | 1989-12-28 | 1990-09-26 | 上海低压电器五厂 | Protector for error/open-phase of motor |
| CN101435838A (en)* | 2007-11-15 | 2009-05-20 | 鸿富锦精密工业（深圳）有限公司 | Apparatus for measuring capacitance capacity |
| CN201388044Y (en)* | 2009-04-07 | 2010-01-20 | 丹东国通电子元件有限公司 | Motor phase sequence protector |
- 2010
- 2010-11-28CNCN2010105614904Apatent/CN102005728A/enactivePending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2062914U (en)* | 1989-12-28 | 1990-09-26 | 上海低压电器五厂 | Protector for error/open-phase of motor |
| CN101435838A (en)* | 2007-11-15 | 2009-05-20 | 鸿富锦精密工业（深圳）有限公司 | Apparatus for measuring capacitance capacity |
| CN201388044Y (en)* | 2009-04-07 | 2010-01-20 | 丹东国通电子元件有限公司 | Motor phase sequence protector |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103631177A (en)* | 2013-09-16 | 2014-03-12 | 华南理工大学 | Direct-current power supply asynchronous parallel digital control system and control method thereof |
| CN106058813A (en)* | 2016-07-08 | 2016-10-26 | 国家电网公司 | Three-phase asynchronous motor power supply protection apparatus |
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