CN204116466U - For phase sequence and the lack detection circuit of three-phase electricity - Google Patents
For phase sequence and the lack detection circuit of three-phase electricity Download PDFInfo
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- CN204116466U CN204116466U CN201420594151.XU CN201420594151U CN204116466U CN 204116466 U CN204116466 U CN 204116466U CN 201420594151 U CN201420594151 U CN 201420594151U CN 204116466 U CN204116466 U CN 204116466U
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Abstract
The utility model discloses a kind of phase sequence for three-phase electricity and lack detection circuit, comprise three tunnel detection branch, every road detection branch includes: current-limiting resistance, photoelectrical coupler, the power supply signal that current-limiting resistance is used for detecting carries out dividing potential drop current limliting, and the power supply signal after dividing potential drop current limliting is passed to the input end of photoelectrical coupler; The output terminal of photoelectrical coupler generates square-wave signal and is connected to carry out the processor of phase sequence and phase shortage judgement; Testing circuit is also provided with common neutral, and the input end of No. three photoelectrical couplers shares common neutral.The change in voltage that the utility model achieves three-phase input power in electric operator operational process detects, and then the square-wave signal of treated device detection photoelectrical coupler generation carries out the judgement of phase shortage and phase sequence, achieve the static pile defection to electric operator and dynamic pile defection, and this testing circuit does not need the center line of zero-power line or electric operator, has versatility.
Description
Technical field
The utility model relates to testing circuit field, especially, relates to a kind of phase sequence for three-phase electricity and lack detection circuit.
Background technology
Being applied in commercial production and daily life in occupation of indispensable status of electric power, equipment relies on during three phase supply work and often requires to detect the phase sequence correctness of the access of three-phase supply and integrality, existing phase sequence and pile defection are mainly realized by " synchronised device ", its circuit theory as shown in Figure 1, comprise three groups of branch roads, often organize branch road and be connected respectively three-phase supply U, V, one of W phase line, each branch road is equipped with current-limiting resistance, diode, photoelectrical coupler, square-wave signal is produced at the output terminal of photoelectrical coupler, Fig. 2 shows square wave PHASEA in Fig. 1, PHASEB, the waveform schematic diagram of PHASEC, when open circuit appears in U, V, W three-phase mutually, this three roads square wave will lack a road, and Dui Zhe tri-road square wave detects it to be had, nothing, and when just can know that three phase electric machine is static, whether electric operator outside three-phase supply phase shortage occurs.Meanwhile, Dui Zhe tri-road square wave detects, and also can know the phase sequence of three-phase supply, thus provides foundation for " phase sequence automatic calibration " function of electric operator.
But synchronised device of the prior art carries out the pile defection of three-phase supply, situation when can only accomplish static to three phase electric machine carries out pile defection, and when three phase electric machine brings into operation opening of receiving that main control unit sends or out code, if the three-phase supply of electric operator outside, in operational process, phase shortage occurs, then can not detected out by such phase synchronous circuit.Reason is, three phase electric machine at this moment forms induction electromotive force by internal stator winding, so time three-phase square wave still exist, so only whether there is by detecting this three roads square wave the judgement obtaining whether phase shortage, easily cause error in judgement.
Utility model content
The utility model object is to provide a kind of phase sequence for three-phase electricity and lack detection circuit, to solve existing synchronised device cannot carry out accurately judgement technical matters to the phase shortage of operating electric operator.
For achieving the above object, the technical solution adopted in the utility model is as follows:
For phase sequence and the lack detection circuit of three-phase electricity, comprise three tunnel detection branch of each phase power supply detecting three-phase input power for correspondence, every road detection branch includes: current-limiting resistance, photoelectrical coupler,
The power supply signal that current-limiting resistance is used for detecting carries out dividing potential drop current limliting, and the power supply signal after dividing potential drop current limliting is passed to the input end of photoelectrical coupler;
The output terminal of photoelectrical coupler generates square-wave signal and is connected to carry out the processor of phase sequence and phase shortage judgement;
Testing circuit is also provided with common neutral, and the input end of No. three photoelectrical couplers shares common neutral.
Further, current-limiting resistance comprises the first current-limiting resistance be located in corresponding detection branch, and every road first current-limiting resistance is connected to common neutral through the second current-limiting resistance respectively.
Further, the input end of photoelectrical coupler is provided with counnter attack diode and/or protection electric capacity.
Further, electric capacity is protected to be metallized polypropylene film electric capacity.
Further, the output terminal of every road photoelectrical coupler is connected to processor through phase inverter.
Further, phase inverter is 74HC14 schmidt trigger phase inverter.
Further, photoelectrical coupler is 6N137 photoelectrical coupler.
Further, processor is single-chip microcomputer.
The utility model has following beneficial effect:
The utility model is used for phase sequence and the lack detection circuit of three-phase electricity, by arranging the common neutral of simulation three-phase neutral point, and the input end of each photoelectrical coupler all shares this common neutral, the change in voltage achieving three-phase input power in electric operator operational process detects, and then the square-wave signal of treated device detection photoelectrical coupler generation carries out the judgement of phase shortage and phase sequence, achieve the static pile defection to electric operator and dynamic pile defection, and this testing circuit does not need the center line of zero-power line or electric operator, there is versatility, phase shortage and the Phase sequence detection of dissimilar electric operator can be widely used in, improve the safety in operation of electric operator.
Except object described above, feature and advantage, the utility model also has other object, feature and advantage.Below with reference to figure, the utility model is described in further detail.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the electrical block diagram of synchronised device in prior art;
Fig. 2 is the square wave schematic diagram that in Fig. 1, photoelectrical coupler generates;
Fig. 3 is the phase sequence of the utility model embodiment for three-phase electricity and the electrical block diagram of lack detection circuit;
Fig. 4 is the view of Tu3Zhong tri-road square wave.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.Term as used herein "and/or" comprises any and all combinations of one or more relevant Listed Items.
With reference to Fig. 3, preferred embodiment of the present utility model provides a kind of phase sequence for three-phase electricity and lack detection circuit, this testing circuit comprises three tunnel detection branch of each phase power supply detecting three-phase input power for correspondence, every road detection branch includes: current-limiting resistance, photoelectrical coupler, wherein, the power supply signal that current-limiting resistance is used for detecting carries out dividing potential drop current limliting, and the power supply signal after dividing potential drop current limliting is passed to the input end of photoelectrical coupler; The output terminal of photoelectrical coupler generates square-wave signal and is connected to carry out the processor of phase sequence and phase shortage judgement.The present embodiment testing circuit is also provided with common neutral, and the input end of No. three photoelectrical couplers shares common neutral.The present embodiment testing circuit, by arranging the common neutral of simulation three-phase central point, the change in voltage achieving three-phase input power in electric operator operational process detects, and then the square-wave signal of treated device detection photoelectrical coupler generation carries out the judgement of phase shortage and phase sequence, achieve the static pile defection to electric operator and dynamic pile defection, and this testing circuit does not need the center line of zero-power line or electric operator, there is versatility, phase shortage and the Phase sequence detection of dissimilar electric operator can be widely used in, improve the safety in operation of electric operator.
With reference to Fig. 3, in the present embodiment, preferably, the U of three-phase input power should have photoelectrical coupler U2, V that photoelectrical coupler U3, W relatively should be had relatively should to have photoelectrical coupler U4 relatively, each photoelectrical coupler is all connected to uniline through current-limiting resistance, the output terminal of each photoelectrical coupler generates square-wave signal, carries out detecting and judging for processor.In the present embodiment, 6N137 photoelectrical coupler selected by photoelectrical coupler, and 6N137 photoelectrical coupler is single pass high speed photo coupling, can obtain the mistake zero condition of each phase of three-phase supply rapidly and accurately.
Preferably, current-limiting resistance comprises the first current-limiting resistance be located in corresponding detection branch, and every road first current-limiting resistance is connected to common neutral through the second current-limiting resistance respectively.In the present embodiment, with reference in Fig. 3, U phase circuit, resistance R2 is connected to common neutral O through resistance R3; In V phase circuit, resistance R4 is connected to common neutral O through resistance R5; In W phase circuit, resistance R6 is connected to common neutral O through resistance R7.Preferably, resistance R2-R7 selects the metalfilmresistor of good stability, to meet the demand of the dividing potential drop current limliting of each detection branch.
Preferably, in the present embodiment, in order to protect the input stage of 6N137 photoelectrical coupler, the input end of each road photoelectrical coupler is equipped with counnter attack diode and protection electric capacity.For U phase circuit, this circuit is arranged in parallel electric capacity C23 between the end and public centerline O of resistance R2, the end of resistance R2 is connected to the anode input terminal of photoelectrical coupler U2 again through divider resistance, the negative electrode input terminal of photoelectrical coupler U2 is connected to common neutral O, and common neutral O is connected through counnter attack diode with between divider resistance.Arranging of V phase circuit and W phase circuit is similar, does not repeat them here.Preferably, protection electric capacity is metallized polypropylene film electric capacity, i.e. MKP electric capacity.
Preferably, in order to the output terminal at photoelectrical coupler generates more regular square wave, the output terminal of every road photoelectrical coupler is connected to processor through phase inverter.In the present embodiment, phase inverter is 74HC14 schmidt trigger phase inverter, processor is single-chip microcomputer, the square wave that No. three photoelectrical couplers export is after the shaping of 74HC14 phase inverter, obtain three road square-wave signal XU1, XU2, XU3, three road square-wave signal XU1, XU2, XU3 input single-chip microcomputer band CCP (Capture, Compare, PWM) three pins of capture function, to compare judgement to the phase sequence of three-phase electricity and phase shortage.
Below the detection of phase sequence and phase shortage is described:
One, Phase sequence detection:
In the present embodiment, the three road square-wave signals of XU1, XU2, XU3 of Fig. 3, directly enter three pins RG0, RG3, RG4 of single-chip microcomputer band CCP capture function, then detect phase sequence by the state of any two RG mouths.The state of three road square waves is as shown in Figure 4:
Such as first via square wave enters RG0 pin, and the second road square wave enters RG3 pin.When the rising edge of the square wave on RG0 pin arrives, judge the state of RG3, should be " low level " state at once as shown in Figure 4, and time the negative edge of the square wave of RG0 arrives, RG3 should be " high level " state, thus show that phase sequence is now " positive sequence ".And when the phase sequence of outside three-phase supply changes time, when the rising edge of the square wave on RG0 pin arrives, judge the state of RG3 at once, then now RG3 reads be " high level " state, and the square wave of RG0 negative edge arrive time, it be " low level " state that RG3 reads, thus show that phase sequence is now " negative phase-sequence ".So just, the phase sequence of three-phase supply can be known, thus provide the function of " phase sequence automatic straightening " for the three phase electric machine of topworks runs.
Two, pile defection:
1, static phase shortage: refer to that the three phase electric machine of electric operator is not also energized and run the front phase shortage just occurred.U phase in such as Fig. 3 is unsettled, then XU1 place is just " low level " state always, does not have square wave and exports.When U phase connecting to neutral, U will change relative to the voltage of " common neutral O ", and the square width of such XU1 will change, and for other V and W phase, also there will be similar phenomenon, thus can judge " the static phase shortage " that occur.
2, dynamic phase shortage: refer to the phase shortage occurred in the process that the three phase electric machine energising of electric operator runs.During dynamic phase shortage, for connecting to neutral phase shortage, similar with the detection method of static phase shortage, no longer repeat specification.And for dynamic unsettled phase shortage, due to the structural factor of three phase electric machine, XU1, XU2, XU3 still have three road square waves and export, but its high level width can change, and this provides possibility for detecting dynamic phase shortage.In operational process, such feature is there is, so general " synchronised device " circuit examines the unsettled phase shortage that occurs in operational process of motor not measuring electric operator just because of three phase electric machine.The present embodiment is the CCP function by single-chip microcomputer, detects the width of the square wave of three ports, and under normal circumstances, width should be 6.7ms, and in time there is phase shortage, width can increase, greatly between 7.6 ~ 10ms.By the seizure of the inner CCP unit of single-chip microcomputer, thus detect whether phase shortage.Such as U phase is unsettled suddenly, then will broaden at the high level of the square wave of XU1 output, and V phase and W phase also have similar sight.Single-chip microcomputer CCP capture function belongs to hardware detection, and Billy changes with pin level and adopts the software detecting method of interrupt timing better.
When detection, in order to avoid the impact due to other factorses such as interference, if there is " phase shortage ", meeting duplicate detection repeatedly, then motor just can be stopped to run and get the warning message of " power phase shortage " on the lcd screen, simultaneous faults relay is understood action and the information of phase shortage is uploaded to central control room by field bus system.
Through facts have proved, the present embodiment testing circuit reliably protects the motor of electric operator.The program has versatility, is also applicable to other industry to the protection of three phase electric machine, solves the problem that phase shortage that three phase electric machine occurs in static and operational process is burnt reliably, promptly, easily.
From above description, the utility model embodiment has following beneficial effect:
The utility model is used for phase sequence and the lack detection circuit of three-phase electricity, by arranging the common neutral of simulation three-phase neutral point, and the input end of each photoelectrical coupler all shares this common neutral, the change in voltage achieving three-phase input power in electric operator operational process detects, and then the square-wave signal of treated device detection photoelectrical coupler generation carries out the judgement of phase shortage and phase sequence, achieve the static pile defection to electric operator and dynamic pile defection, and this testing circuit does not need the center line of zero-power line or electric operator, there is versatility, phase shortage and the Phase sequence detection of dissimilar electric operator can be widely used in, improve the safety in operation of electric operator.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (8)
1. for phase sequence and the lack detection circuit of three-phase electricity, it is characterized in that, comprise three tunnel detection branch of each phase power supply detecting three-phase input power for correspondence, described in every road, detection branch includes: current-limiting resistance, photoelectrical coupler,
The power supply signal that described current-limiting resistance is used for detecting carries out dividing potential drop current limliting, and the power supply signal after dividing potential drop current limliting is passed to the input end of described photoelectrical coupler;
The output terminal of described photoelectrical coupler generates square-wave signal and is connected to carry out the processor of phase sequence and phase shortage judgement;
Described testing circuit is also provided with common neutral, and described in three tunnels, the input end of photoelectrical coupler shares described common neutral.
2. the phase sequence for three-phase electricity according to claim 1 and lack detection circuit, is characterized in that,
Described current-limiting resistance comprises the first current-limiting resistance be located in corresponding described detection branch, and described in every road, the first current-limiting resistance is connected to described common neutral through the second current-limiting resistance respectively.
3. the phase sequence for three-phase electricity according to claim 1 and lack detection circuit, is characterized in that,
The input end of described photoelectrical coupler is provided with counnter attack diode and/or protection electric capacity.
4. the phase sequence for three-phase electricity according to claim 3 and lack detection circuit, is characterized in that,
Described protection electric capacity is metallized polypropylene film electric capacity.
5. the phase sequence for three-phase electricity according to claim 1 and lack detection circuit, is characterized in that,
Described in every road, the output terminal of photoelectrical coupler is connected to described processor through phase inverter.
6. the phase sequence for three-phase electricity according to claim 5 and lack detection circuit, is characterized in that,
Described phase inverter is 74H C 14 schmidt trigger phase inverter.
7., according to the arbitrary described phase sequence for three-phase electricity of claim 1 to 6 and lack detection circuit, it is characterized in that,
Described photoelectrical coupler is 6N 137 photoelectrical coupler.
8. the phase sequence for three-phase electricity according to claim 7 and lack detection circuit, is characterized in that,
Described processor is single-chip microcomputer.
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| CN201420594151.XU CN204116466U (en) | 2014-10-14 | 2014-10-14 | For phase sequence and the lack detection circuit of three-phase electricity |
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| CN106093607A (en) * | 2016-06-14 | 2016-11-09 | 江苏科技大学 | The circuit of testing the phase sequence of a kind of brshless DC motor and detection method |
| CN106125027A (en) * | 2016-06-14 | 2016-11-16 | 江苏科技大学 | The testing circuit of a kind of brshless DC motor Hall element and detection method |
| CN106124873A (en) * | 2016-06-14 | 2016-11-16 | 江苏科技大学 | A kind of brshless DC motor three-phase windings circuit of testing the phase sequence and detection method |
| CN106645951A (en) * | 2017-02-24 | 2017-05-10 | 珠海格力电器股份有限公司 | Three-phase circuit detection apparatus and method |
| CN108037377A (en) * | 2017-12-28 | 2018-05-15 | 北京动力源科技股份有限公司 | A kind of method and circuit for detecting three-phase alternating-current supply phase shortage |
| CN108196137A (en) * | 2018-01-24 | 2018-06-22 | 广东志高暖通设备股份有限公司 | A kind of three-phase power detection circuit and method |
| CN109839547A (en) * | 2017-11-24 | 2019-06-04 | 深圳市蓝海华腾技术股份有限公司 | A kind of three-phase power supply phase sequence detection circuit |
| CN113514711A (en) * | 2020-04-09 | 2021-10-19 | 浙江海利普电子科技有限公司 | Phase sequence detection device and phase sequence detection method |
| CN113533869A (en) * | 2021-09-02 | 2021-10-22 | 广东海悟科技有限公司 | Three-phase alternating current phase loss and reverse phase sequence detection method and detection device |
| CN113740768A (en) * | 2021-07-22 | 2021-12-03 | 南方电网深圳数字电网研究院有限公司 | Zero line fault detection device, method, electronic equipment and storage medium |
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| CN106125027A (en) * | 2016-06-14 | 2016-11-16 | 江苏科技大学 | The testing circuit of a kind of brshless DC motor Hall element and detection method |
| CN106124873A (en) * | 2016-06-14 | 2016-11-16 | 江苏科技大学 | A kind of brshless DC motor three-phase windings circuit of testing the phase sequence and detection method |
| CN106093607A (en) * | 2016-06-14 | 2016-11-09 | 江苏科技大学 | The circuit of testing the phase sequence of a kind of brshless DC motor and detection method |
| CN106124873B (en) * | 2016-06-14 | 2018-12-14 | 江苏科技大学 | A kind of brshless DC motor three-phase windings circuit of testing the phase sequence and detection method |
| CN106093607B (en) * | 2016-06-14 | 2019-01-18 | 江苏科技大学 | A kind of circuit of testing the phase sequence and detection method of brshless DC motor |
| CN106125027B (en) * | 2016-06-14 | 2019-01-18 | 江苏科技大学 | A kind of detection circuit and detection method of brshless DC motor Hall sensor |
| CN106645951A (en) * | 2017-02-24 | 2017-05-10 | 珠海格力电器股份有限公司 | Three-phase circuit detection apparatus and method |
| CN109839547A (en) * | 2017-11-24 | 2019-06-04 | 深圳市蓝海华腾技术股份有限公司 | A kind of three-phase power supply phase sequence detection circuit |
| CN109839547B (en) * | 2017-11-24 | 2024-01-30 | 深圳市蓝海华腾技术股份有限公司 | Three-phase power phase sequence detection circuit |
| CN108037377A (en) * | 2017-12-28 | 2018-05-15 | 北京动力源科技股份有限公司 | A kind of method and circuit for detecting three-phase alternating-current supply phase shortage |
| CN108196137B (en) * | 2018-01-24 | 2019-12-31 | 广东志高暖通设备股份有限公司 | Three-phase electricity detection circuit and method |
| CN108196137A (en) * | 2018-01-24 | 2018-06-22 | 广东志高暖通设备股份有限公司 | A kind of three-phase power detection circuit and method |
| CN113514711A (en) * | 2020-04-09 | 2021-10-19 | 浙江海利普电子科技有限公司 | Phase sequence detection device and phase sequence detection method |
| CN113740768A (en) * | 2021-07-22 | 2021-12-03 | 南方电网深圳数字电网研究院有限公司 | Zero line fault detection device, method, electronic equipment and storage medium |
| CN113740768B (en) * | 2021-07-22 | 2024-05-14 | 南方电网数字平台科技(广东)有限公司 | Zero line fault detection device and method, electronic equipment and storage medium |
| CN113533869A (en) * | 2021-09-02 | 2021-10-22 | 广东海悟科技有限公司 | Three-phase alternating current phase loss and reverse phase sequence detection method and detection device |
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Address after: 412007 "no.212-215 office" of South valve single storey joint span workshop and auxiliary (workshop of original power station valve workshop warehouse) and office building (room) of Tiantai Industrial Park, Tianyuan District, Zhuzhou City, Hunan Province Patentee after: Zhuzhou South General Electric Co., Ltd. Address before: Baoan District Fuyong Zhen Fu Garden in Shenzhen city Guangdong province 518103 Road, Tin Shui Dong A5 Industrial Park Patentee before: SHENZHEN SOUTHERN GENERAL ELECTRIC COMPANY LIMITED |