CN101943718A - Phase sequence detection method and device of three-phase alternating current - Google Patents
Phase sequence detection method and device of three-phase alternating current Download PDFInfo
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- CN101943718A CN101943718A CN2010102643303A CN201010264330A CN101943718A CN 101943718 A CN101943718 A CN 101943718A CN 2010102643303 A CN2010102643303 A CN 2010102643303A CN 201010264330 A CN201010264330 A CN 201010264330A CN 101943718 A CN101943718 A CN 101943718A
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Abstract
The invention discloses a phase sequence detection method and device of the three-phase alternating current and relates to the detection technical field. The setting of the device is as follows: a three-phase alternating-current transformer is firstly connected with a current-limiting resistor and secondly connected with the positive input end of a comparator, the output end of the comparator is connected with the IO port of a single chip microcomputer, and the IO port is also connected with a light-emitting diode used for indicating the phase-sequence information of the current. When a detection is performed, the three-phase alternating-current transformer reduces the voltage of each phase of the input three-phase alternating current and then performs the square wave shaping treatment, the rising edge of one phase of the three-phase alternating current is identified and then used as the reference datum; the condition that one of two other phases in the three-phase alternating current first has a rising edge is checked; and the phase sequence of the three-phase alternating current can be judged according to the phase used as the reference datum and the phase which first has a rising edge. The method and device of the invention can adapt to different frequencies of the ordinary electricity and judge the phase sequence of the three-phase alternating current fast and accurately.
Description
Technical field
The invention belongs to the detection technique field, be specifically related to a kind of phase sequence detecting method and device of three-phase alternating current.
Background technology
The normal operation of three phase supply equipment and the phase sequence of three-phase electricity are closely bound up, so the correct detection of three-phase electricity phase sequence is the basic demand of a lot of three-phase equipments.
Utilize the feature of three-phase alternating current instantaneous voltage waveform in the existing phase sequence measuring technique, in each phase place of preset time interval alternate sweep; Calculate measured value by a kind of suitable predetermined method of determining and calculating, or the symbol of only calculating the measured value in two moment determines phase sequence, but this method is based on waveform character in essence, the quality of waveform is influential to the accuracy of measurement result.
Summary of the invention
Technical matters to be solved by this invention provides a kind of different frequency that can adapt to common electricity consumption, carries out the phase sequence detecting method and the device of the three-phase alternating current that the phase sequence of three-phase alternating current judges fast and accurately.
For achieving the above object, the present invention adopts technical scheme as described below:
A), carry out the square wave shaping after three-phase ac transformer each phase step-down of three-phase alternating current and handle input, the wherein rising edge of a phase in the identification three-phase alternating current is a reference data with the rising edge of this phase;
B), which occurs rising edge mutually at first in the other two-phase in the wait three-phase alternating current;
C), according to occurring the phase sequence that one of rising edge can be judged three-phase alternating current mutually after reaching mutually as one of reference benchmark at first.
Wherein, technical solution of the present invention is by implementing with lower device: the three-phase ac transformer that receives the three-phase alternating-current supply input connects current-limiting resistance, receive the positive input terminal of comparer again, the output terminal of comparer connects the IO port of single-chip microcomputer, and the IO port of single-chip microcomputer also is connected to the light emitting diode of the phase sequence information of indication electricity.
When technical scheme of the present invention is implemented, three-phase alternating-current supply is input to a three-phase ac transformer, three-phase ac transformer all drops to the three-phase alternating current that peak value is no more than 5V to the voltage of each phase of three-phase alternating current, each of three-phase ac transformer connects a resistance mutually more then, and this resistance plays current limliting; Receive the input end in the same way of a comparer afterwards, the reverse input end ground wire of comparer, the output terminal of comparer connect the IO port of single-chip microcomputer; Because the frequency of AC network is 50Hz or 60Hz mostly, this speed is very low frequency to common monolithic, so single-chip microcomputer can be judged the phase sequence of three-phase electricity according to the input condition of comparer, after single-chip microcomputer is finished judgement to phase sequence, single-chip microcomputer is lighted the light emitting diode that is connected with the IO port by the IO port of self again, indicates the phase sequence information of three-phase alternating current.
Owing to adopted aforesaid technical scheme, the present invention has following beneficial effect:
Because the present invention carries out the square wave shaping after to the three-phase alternating current step-down, the square wave antijamming capability is better than the sine wave of three-phase alternating current, and therefore the accuracy rate of judging according to square wave improves.
Because the present invention adopts the action method that continues sampling, promptly discern a wherein phase in the three-phase alternating current
Rising edge and be reference data with the rising edge of this phase after, continue the square-wave signal of input is sampled; From
And the misjudgment phenomenon of effectively avoiding the instantaneous sampling mode to occur because of undesired signal.
Description of drawings
Fig. 1 is the circuit block diagram of apparatus of the present invention;
Fig. 2 is the circuit theory diagrams of apparatus of the present invention;
Fig. 3 is the invention process process flow diagram flow chart;
Embodiment
Below in conjunction with accompanying drawing and preferred implementation the present invention is explained further, it should be noted that the present invention is not limited to following embodiment.
In conjunction with Fig. 1, Fig. 2, apparatus of the present invention are set to: three-phase alternating-current supply is received the input end of three-phase alternating current step-down transformer, after the step-down through the three-phase alternating current step-down transformer, the three-phase alternating current U of output low pressure, V, W, the not super 5V of the voltage-to-ground peak value of this three-phase alternating current, U then, V, the W three-phase respectively with three resistance R 1, R2, R3 connects, resistance R 1, R2, R3 connects the input end in the same way of three comparing units of voltage comparator LM339 again, the reverse input end of these three comparing units all is connected with ground wire, voltage comparator LM339 adopts the single supply mode to power, + VCC end is connected with the positive terminal of 5V direct supply, and-VCC end is connected with the negative pole end of 5V direct supply; Three output terminals of voltage comparator LM339 are connected with three IO port P0.0, P0.1, the P0.2 of single chip computer AT 89C81, and these three IO terminals are connected with the positive terminal of 5V direct supply through three resistance respectively, form pull-up circuit; The P1.0 of single chip computer AT 89C81, P1.1, P1.2 connect redness, yellow, green LED light emitting diode respectively, are used for indicating the position of IO port P0.0 inverse correspondence in phase sequence; The P1.3 of single chip computer AT 89C81, P1.4, P1.5 connect redness, yellow, green LED light emitting diode respectively, are used for indicating the position of IO port P0.1 inverse correspondence in phase sequence; The P1.5 of single chip computer AT 89C81, P1.6, P3.0 connect redness, yellow, green LED light emitting diode respectively, are used for indicating the position of IO port P0.2 inverse correspondence in phase sequence.
In conjunction with Fig. 3, the program of single chip computer AT 89C81 operation to the phase sequence determination methods of three-phase alternating-current supply is: single chip computer AT 89C51 is after startup is finished, three IO port P0.0 that continual scanning is connected with voltage comparator LM339, P0.1, the state of P0.2, when scanning one of them port when from low to high saltus step occurring after the situation, what remember the corresponding connection of this IO port is the R phase of three-phase alternating-current supply, judge the state of two other IO ports then, when from low to high saltus step also appears in one of them in scanning these remaining two IO ports after the situation, what remember the corresponding connection of this IO port is the S phase of three-phase alternating-current supply, is the corresponding connection of the IO port that saltus step from low to high also do not occur the T phase of three-phase alternating-current supply, arrive this, the judgement of phase sequence just becomes, the sequencing of phase sequence is R, S, the three-phase in the three-phase alternating-current supply of T correspondence; Last single chip computer AT 89C81 lights the red LED light emitting diode in the corresponding three kinds of LED light emitting diodes of R, light the yellow led light emitting diode in the corresponding three kinds of LED light emitting diodes of S, light the green LED light emitting diode in the corresponding three kinds of LED light emitting diodes of T.
Claims (2)
1. the phase sequence detecting method of a three-phase alternating current is characterized in that:
A), carry out the square wave shaping after three-phase ac transformer each phase step-down of three-phase alternating current and handle input, the wherein rising edge of a phase in the identification three-phase alternating current is a reference data with the rising edge of this phase;
B), which occurs rising edge mutually at first in the other two-phase in the wait three-phase alternating current;
C), according to occurring the phase sequence that one of rising edge can be judged three-phase alternating current mutually after reaching mutually as one of reference benchmark at first.
2. implement the device of the phase sequence detecting method of the described three-phase alternating current of claim 1, it is characterized in that: the three-phase ac transformer that receives the three-phase alternating-current supply input connects current-limiting resistance, receive the positive input terminal of comparer again, the output terminal of comparer connects the IO port of single-chip microcomputer, and the IO port of single-chip microcomputer also is connected to the light emitting diode of the phase sequence information of indication electricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102643303A CN101943718A (en) | 2010-08-27 | 2010-08-27 | Phase sequence detection method and device of three-phase alternating current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102643303A CN101943718A (en) | 2010-08-27 | 2010-08-27 | Phase sequence detection method and device of three-phase alternating current |
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| CN101943718A true CN101943718A (en) | 2011-01-12 |
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| CN2010102643303A Pending CN101943718A (en) | 2010-08-27 | 2010-08-27 | Phase sequence detection method and device of three-phase alternating current |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944760A (en) * | 2012-10-17 | 2013-02-27 | 中色科技股份有限公司 | Simple and easy phase sequence test method of three-phase alternating current |
| CN104076209A (en) * | 2014-06-12 | 2014-10-01 | 珠海格力电器股份有限公司 | Motor detection device |
| CN106546831A (en) * | 2015-09-18 | 2017-03-29 | 承永资讯科技股份有限公司 | The judging phase order devices and methods therefor of three phase mains |
-
2010
- 2010-08-27 CN CN2010102643303A patent/CN101943718A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944760A (en) * | 2012-10-17 | 2013-02-27 | 中色科技股份有限公司 | Simple and easy phase sequence test method of three-phase alternating current |
| CN104076209A (en) * | 2014-06-12 | 2014-10-01 | 珠海格力电器股份有限公司 | Motor detection device |
| CN104076209B (en) * | 2014-06-12 | 2016-08-17 | 珠海格力电器股份有限公司 | Motor detection device |
| CN106546831A (en) * | 2015-09-18 | 2017-03-29 | 承永资讯科技股份有限公司 | The judging phase order devices and methods therefor of three phase mains |
| CN106546831B (en) * | 2015-09-18 | 2019-09-10 | 承永资讯科技股份有限公司 | The judging phase order devices and methods therefor of three phase mains |
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Application publication date: 20110112 |