CN202049200U - Digital three-phase alternating-current phase-sequence phase lack detecting device - Google Patents
Digital three-phase alternating-current phase-sequence phase lack detecting device Download PDFInfo
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- CN202049200U CN202049200U CN 201020644915 CN201020644915U CN202049200U CN 202049200 U CN202049200 U CN 202049200U CN 201020644915 CN201020644915 CN 201020644915 CN 201020644915 U CN201020644915 U CN 201020644915U CN 202049200 U CN202049200 U CN 202049200U
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Abstract
The utility model discloses a digital three-phase alternating-current phase-sequence phase lack detecting device, comprising a three-phase alternating-current voltage rectifier circuit, a digital signal processor and an output port, wherein the digital signal processor comprise a square wave ascending edge capturing module, a power phase-sequence detecting module and a power phase lock detecting module. In the utility model, three-phase alternating-current digits are converted and a positive and negative phase-sequence digital logic analysis TAB sheet of a three-phase alternating-current power supply is queried, thus directly obtaining the phase sequence direction and judging the phase lack of current three-phase alternating-current electricity.
Description
Technical field
The utility model relates to three-phase alternating-current supply detection and motor phase sequence control field, is specifically related to a kind of digital three-phase alternating current phase sequence phase shortage pick-up unit.
Background technology
Along with the large-scale popularization of frequency converter is used, when using frequency converter to move to 50HZ, the place that the process of using in market is very many switches to power frequency supply, it is anti-phase to allow phase sequence to occur in this case anything but, in case the phase sequence mistake occurs, can cause great dash current, cause electrical fault, even damage, even if can normally switch in the past, can cause traffic direction inconsistent of motor because worker's frequency converter phase sequence is inconsistent, can cause bigger equipment failure, even the personal safety fault, as jack lift, lathe, elevator, staircase etc.So three-phase power supply phase sequence detects and is necessary very much reliably.
2 kinds of methods that the problem of solution three-phase power supply phase sequence detection at present mainly adopts are as follows:
1, hardware mensuration utilizes three-phase alternating current mutual deviation 120 degree principles to adopt comparer and trigger to discern positive negative-phase sequence, and shortcoming is the hardware circuit complexity, anti-interference is poor, be easy to generate erroneous judgement, signal output is single, is the patented claim of " CN1766662A " as publication number.
2, a: gathering the instant value of three-phase alternating voltage in real time, carry out coordinate transform and obtain the sense of rotation of angular frequency and differentiate, is the patented claim of " CN 101329963A " as publication number.B: gather three-phase alternating voltage and electric current in real time, ask voltage/current rotating vector phase angle difference, current phase sequence direction is tried to achieve in logical more a series of mathematical operation and coordinate transform, is the patented claim of " CN 1387048A " as publication number.C: utilize AC Data, interior N point three-phase instantaneous voltage value of civil power cycle of discrete acquisitions is differentiated the phase sequence direction by the processor computational analysis, is the patented claim of " CN 101713799A " as publication number.A as can be seen, b, three kinds of situations of c all need a large amount of discrete analog amount of processor sampling, and utilize the complex mathematical algorithm to obtain three-phase alternating current phase sequence direction indirectly, exist data processing amount greatly, make mistakes easily, to the unusual shortcoming such as complexity of processor requirement height, implementation procedure.
The utility model content
The utility model provides a kind of simple and reliable digital three-phase alternating current phase sequence phase shortage pick-up unit in order to overcome the deficiency that above prior art exists.The utility model is by with the three-phase alternating current digital conversion and inquire about the positive negative-phase sequence Digital Logic of three-phase alternating-current supply and analyze the TAB table, directly can draw current phase order of 3-phase AC direction and phase shortage whether.
The purpose of this utility model realizes by following technical scheme: this digital three-phase alternating current phase sequence phase shortage pick-up unit, it is characterized in that: comprise three-phase alternating current repoussage wave circuit, digital signal processor and output port, digital signal processor comprises square wave rising edge capture module, power phase detection module and power supply open phase detection module;
Three-phase wire connects three-phase alternating current repoussage wave circuit, three-phase alternating current repoussage wave circuit connects square wave rising edge capture module, square wave rising edge capture module connects power phase detection module and power supply open phase detection module, and the power phase detection module is connected output port with the power supply open phase detection module;
Three-phase alternating current repoussage wave circuit is used for three phase AC sine wave is made into square wave, and the square wave rising edge capture module of digital signal processor is delivered in filtering;
Square wave rising edge capture module is used to catch the square wave rising edge and produces respective interrupt and the storage input state;
The power phase detection module is looked into the positive negative-phase sequence Digital Logic analysis of three-phase alternating-current supply TAB table differentiation power phase according to interruption and storage input state, and Digital Logic analysis TAB table is built among the ROM of digital signal processor;
The positive negative-phase sequence Digital Logic of three-phase alternating-current supply analytical table is as follows:
Table 1:
The power supply open phase detection module, whether read three-phase input state variable PULSE condition discrimination has phase shortage;
Output port carries out switching value or communication output to current differentiation phase sequence and non-full-phase state.
Described digital signal processor model is TMS320LF2406A.
Described output port is 485 interfaces or relay.
The detection method of above-mentioned digital three-phase alternating current phase sequence phase shortage pick-up unit may further comprise the steps:
(1), three-phase wire connects three-phase alternating current repoussage wave circuit, three phase AC sine wave is made into square wave, and the square wave rising edge capture module of digital signal processor delivered in filtering;
(2), square wave rising edge capture module, catch the square wave rising edge and also produce respective interrupt and storage input state;
(3), when square wave rising edge capture module has the three-phase square wave input, just can produce first interruption as long as detect square wave rising edge CAP, interrupt producing back power phase detection module, among three-phase wire CAP1, CAP2, the CAP3 which just write down what produce first interruption be, and be the corresponding PULSE variable of the ABC of this CAP relevant position 100;
When determining first square wave rising edge, a civil power that is captured for the second time at first square wave rising edge is in cycle length, produce interruption if detect second CAP, interrupt producing back power phase detection module, among three-phase wire CAP1, CAP2, the CAP3 which just write down what produce second interruption be, and be the corresponding PULSE variable of the ABC of this CAP relevant position 010;
If do not detect the interruption that second CAP produces, then the PULSE variable relevant position of second CAP correspondence is 000;
When determining first square wave rising edge, a civil power that is captured for the second time at first square wave rising edge is in cycle length, produce interruption if detect the 3rd CAP, interrupt producing back power phase detection module, among three-phase wire CAP1, CAP2, the CAP3 which just write down what produce the 3rd interruption be, and be the corresponding PULSE variable of the ABC of this CAP relevant position 001;
If do not detect the interruption that the 3rd CAP produces, then the PULSE variable relevant position of the 3rd CAP correspondence is 000;
When first square wave rising edge that is caught in is captured for the second time then as a sampling period, position PHASE_FLAG puts 1 the phase sequence distinguishing mark, read PULSE variable BIT0-8 position simultaneously, the CAP that judges three interruptions belongs to 1,2,3 in the positive negative-phase sequence Digital Logic of the three-phase alternating-current supply analytical table mutually with ABC, 4,5,6 the row in which, can draw positive negative-phase sequence; And whether the power supply open phase detection module reads three-phase input state variable PULSE condition discrimination phase shortage, (TMS320LF2406A is 16 bit digital signal processors to the PULSE variable, so variable PULSE is 16, the utility model is only used preceding 9 of BIT0-BIT8) in BIT0-BIT2 be that 000 expression CAP3 goes up the wiring phase shortage, BIT3-BIT5 is that 000 expression CAP2 goes up the wiring phase shortage, and BIT6-BIT8 is that 000 expression CAP1 goes up the wiring phase shortage;
(4), output port, current differentiation phase sequence and non-full-phase state are carried out switching value or communication output.
Below the utility model content is described further:
The power phase detection module, this is the core algorithm module of whole device, and the phase sequence testing process is mainly based on the Digital Logic analytic approach, and its analytic process is as follows:
Three-phase alternating current by A, B, C three phase compositions, has 6 kinds of array modes by array mode, according to the three-phase alternating-current supply characteristic as can be known altogether, come branch to have only dual mode by the voltage sense of rotation, the one, the forward phase sequence, the 2nd, reverse phase sequence, forward and reverse phase sequence of 6 kinds of array modes is as follows:
Three kinds of state: the A → B → C B → C → A C → A → B of forward power supply
Three kinds of state: the C → B → A B → A → C A → C → B of reverse electrical source
Because three-phase alternating-current supply mutual deviation 120 degree, so three-phase A, B, C has uniqueness at one time, use A, B, C corresponding respectively three binary number word bit BIT8-BIT6, BIT5-BIT3 or BIT2-BIT0, then constructing above-mentioned positive and negative phase sequence mathematical model with digital model can be expressed as: three kinds of states of forward power supply: three kinds of states of 100 → 010 → 001 010 → 001 → 100 001 → 100 → 010 reverse electrical source: 001 → 010 → 100 010 → 100 → 001 100 → 001 → 010
In the production application journey, the power supply that connects is not being known A, B, and under the situation of C phase, wiring causes CPA1, CAP2, CAP3 and also has only 6 kinds of array modes as follows:
CAP1：CAP2：CAP3＝A：B：C
CAP1：CAP2：CAP3＝B：C：A
CAP1：CAP2：CAP3＝C：A：B
CAP1：CAP2：CAP3＝C：B：A
CAP1：CAP2：CAP3＝B：A：C
CAP1：CAP2：CAP3＝A：C：B
Therefore can make up a positive negative-phase sequence Digital Logic of three-phase alternating-current supply and analyze the TAB table as table 1, and table 1 is made a digital TAB show to be built among the digital signal processor ROM, the recognition methods of then described three-phase alternating-current supply phase sequence is: can interrupt input state according to terminals CAP1, CPA2, CAP3 and look into built-in TAB table, judge the affiliated state of current wiring, if input state is at the 1-3 of table 1 state, it then is the forward phase sequence, if input state at the 4-6 of table 1 state, then is reverse phase sequence.
The utility model has following advantage with respect to prior art:
This digital three-phase alternating current phase sequence phase shortage pick-up unit and detection method, phase sequence detecting method adopts 0 and 1 Digital Logic analytic approach directly to get the phase sequence direction, need not carry out electric current and voltage analog quantity sampling and carry out asking the phase sequence direction more indirectly after the complex mathematical computing, the simple and reliable property of method is higher, and antijamming capability is strong.And the utility model can directly be found out current phase shortage place terminals in input power supply phase shortage.
Description of drawings
Fig. 1 is the connection block diagram of digital three-phase alternating current phase sequence phase shortage pick-up unit of the present utility model.
Fig. 2 is three-phase alternating-current supply A of the present utility model, B, the sinusoidal wave synoptic diagram of the positive negative-phase sequence of C.
Fig. 3 is three-phase alternating-current supply A of the present utility model, B, the positive negative-phase sequence square wave of C synoptic diagram.
Fig. 4 is the testing process figure of three-phase alternating-current supply phase sequence of the present utility model, phase shortage.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
Digital three-phase alternating current phase sequence phase shortage pick-up unit as shown in Figure 1, comprise three-phase alternating current repoussage wave circuit, digital signal processor and output port, digital signal processor comprises square wave rising edge capture module, power phase detection module and power supply open phase detection module;
Three-phase wire connects three-phase alternating current repoussage wave circuit, three-phase alternating current repoussage wave circuit connects square wave rising edge capture module, square wave rising edge capture module connects power phase detection module and power supply open phase detection module, and the power phase detection module is connected output port with the power supply open phase detection module;
By simple diode and reliable three-phase alternating current repoussage wave circuit of voltage stabilizing diode structure, be used for three phase AC sine wave is made into three-phase square wave, and the square wave rising edge capture module of digital signal processor is delivered in filtering;
Square wave rising edge capture module is used to catch the square wave rising edge and produces respective interrupt and the storage input state;
The power phase detection module is looked into the positive negative-phase sequence Digital Logic analysis of three-phase alternating-current supply TAB table differentiation power phase according to interruption and storage input state, and the Digital Logic analytical table is built among the ROM of digital signal processor;
It is as follows that the positive negative-phase sequence Digital Logic of three-phase alternating-current supply is analyzed the TAB table:
Table 1:
The power supply open phase detection module, whether read three-phase input state variable PULSE condition discrimination has phase shortage;
Output port carries out switching value or communication output to current differentiation phase sequence and non-full-phase state.
Described digital signal processor model is TMS320LF2406A.
Described output port is 485 interfaces or relay.
The detection method of above-mentioned digital three-phase alternating current phase sequence phase shortage pick-up unit is characterized in that may further comprise the steps:
(1), three-phase wire connects three-phase alternating current repoussage wave circuit, three phase AC sine wave is made into square wave, and the square wave rising edge capture module of digital signal processor delivered in filtering;
(2), square wave rising edge capture module, catch the square wave rising edge and also produce respective interrupt and storage input state;
(3), when square wave rising edge capture module has the three-phase square wave input, just can produce first interruption as long as detect square wave rising edge CAP, interrupt producing back power phase detection module, among three-phase wire CAP1, CAP2, the CAP3 which just write down what produce first interruption be, and be the corresponding PULSE variable of the ABC of this CAP relevant position 100;
When determining first square wave rising edge, a civil power that is captured for the second time at first square wave rising edge is in cycle length, produce interruption if detect second CAP, interrupt producing back power phase detection module, among three-phase wire CAP1, CAP2, the CAP3 which just write down what produce second interruption be, and be the corresponding PULSE variable of the ABC of this CAP relevant position 010;
If do not detect the interruption that second CAP produces, then the PULSE variable relevant position of second CAP correspondence is 000;
When determining first square wave rising edge, a civil power that is captured for the second time at first square wave rising edge is in cycle length, produce interruption if detect the 3rd CAP, interrupt producing back power phase detection module, among three-phase wire CAP1, CAP2, the CAP3 which just write down what produce the 3rd interruption be, and be the corresponding PULSE variable of the ABC of this CAP relevant position 001;
If do not detect the interruption that the 3rd CAP produces, then the PULSE variable relevant position of the 3rd CAP correspondence is 000;
When first square wave rising edge that is caught in is captured for the second time then as a sampling period, position PHASE_FLAG puts 1 the phase sequence distinguishing mark, read PULSE variable BIT0-8 position simultaneously, the CAP that judges three interruptions belongs to 1,2,3 in the positive negative-phase sequence Digital Logic of the three-phase alternating-current supply analytical table mutually with ABC, 4,5,6 the row in which, can draw positive negative-phase sequence; And whether the power supply open phase detection module reads three-phase input state variable PULSE condition discrimination phase shortage, (TMS320LF2406A is 16 bit digital signal processors to the PULSE variable, so variable PULSE is 16, the utility model is only used preceding 9 of BIT0-BIT8, three-phase supply input state respectively corresponding stored is high-order in 16 bit variable PULSE low) in BIT0-BIT2 be upward wiring phase shortage of 000 expression CAP3, BIT3-BIT5 is that 000 expression CAP2 goes up the wiring phase shortage, and BIT6-BIT8 is that 000 expression CAP1 goes up the wiring phase shortage;
(4), output port, current differentiation phase sequence and non-full-phase state are carried out switching value or communication output.
Detection method is further analyzed:
Three-phase alternating current A, B, C three-phase receive on CAP1, CAP2, the CAP3 terminal, and A, B, the rising edge of C three-phase square wave might become first and be caught in, and we do following analysis at these three kinds of situations so:
When 1, first rising edge was A, interrupt handling routine can be changed to the PULSE variable of CAP1, CAP2, CAP3 correspondence respectively according to break sequence: 100,010,001.
When 2, first rising edge was B, interrupt handling routine can be changed to the PULSE variable of CAP2, CAP3, CAP1 correspondence respectively according to break sequence: 100,010,001.
When 3, first rising edge was C, interrupt handling routine can be changed to the PULSE variable of CAP3, CAP1, CAP2 correspondence respectively according to break sequence: 100,010,001.
That is to say in the top mode of connection that be caught in earlier no matter the square wave of which phase rises, the PULSE variable of three kinds of situation correspondences tables look-up 1, just can judge current input state is the forward phase sequence.
With A, B, C transfer wherein two-phase to receive on CAP1, CAP2, the CAP3 terminal arbitrarily again and are analyzed, i.e. B, A, C receives CAP1, and CAP2 is on the CAP3 terminal, same A, B, the rising edge of C three-phase square wave might become first and be caught in, and we do following analysis at these three kinds of situations so:
When 1, first rising edge was A, interrupt handling routine can be changed to the PULSE variable position of CAP2, CAP1, CAP3 correspondence respectively according to break sequence: 100,010,001;
When 2, first rising edge was B, interrupt handling routine can be changed to the PULSE variable position of CAP1, CAP3, CAP2 correspondence respectively according to break sequence: 100,010,001;
When 3, first rising edge was C, interrupt handling routine can be changed to the PULSE variable position of CAP3, CAP2, CAP1 correspondence respectively according to break sequence: 100,010,001;
With above-mentioned, no matter rising, the square wave of which phase is caught in earlier, and the PULSE variable of three kinds of situation correspondences tables look-up 1, and just can judge current input state is reverse phase sequence.
So just can be by catching the three-phase square wave rising edge, by break sequence and inquire about the positive negative-phase sequence Digital Logic of built-in three-phase alternating-current supply and analyze the TAB table, just can directly draw the positive negative-phase sequence of input and phase shortage whether.For guaranteeing the accuracy of identification, can adopt sample continuously 10 times.
Above-mentioned is the utility model preferred embodiment; not in order to restriction the utility model; should be understood that; for the person of ordinary skill of the art; every any modification of within spirit of the present utility model and principle, being done, be equal to and replace or improvement etc., all should be included within the protection domain of the present utility model.
Claims (3)
1. digital three-phase alternating current phase sequence phase shortage pick-up unit, it is characterized in that: comprise three-phase alternating current repoussage wave circuit, digital signal processor and output port, digital signal processor comprises square wave rising edge capture module, power phase detection module and power supply open phase detection module;
Three-phase wire connects three-phase alternating current repoussage wave circuit, three-phase alternating current repoussage wave circuit connects square wave rising edge capture module, square wave rising edge capture module connects power phase detection module and power supply open phase detection module, and the power phase detection module is connected output port with the power supply open phase detection module;
Three-phase alternating current repoussage wave circuit is used for three phase AC sine wave is made into square wave, and the square wave rising edge capture module of digital signal processor is delivered in filtering;
Square wave rising edge capture module is used to catch the square wave rising edge and produces respective interrupt and the storage input state;
The power phase detection module is looked into the positive negative-phase sequence Digital Logic analysis of three-phase alternating-current supply TAB table differentiation power phase according to interruption and storage input state, and the Digital Logic analytical table is built among the ROM of digital signal processor;
It is as follows that the positive negative-phase sequence Digital Logic of three-phase alternating-current supply is analyzed the TAB table:
The power supply open phase detection module, whether read three-phase input state variable PULSE condition discrimination has phase shortage;
Output port carries out switching value or communication output to current differentiation phase sequence and non-full-phase state.
2. digital three-phase alternating current phase sequence phase shortage pick-up unit according to claim 1, it is characterized in that: described digital signal processor model is TMS320LF2406A.
3. digital three-phase alternating current phase sequence phase shortage pick-up unit according to claim 1, it is characterized in that: described output port is 485 interfaces or relay.
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| CN 201020644915 CN202049200U (en) | 2010-12-07 | 2010-12-07 | Digital three-phase alternating-current phase-sequence phase lack detecting device |
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| CN 201020644915 CN202049200U (en) | 2010-12-07 | 2010-12-07 | Digital three-phase alternating-current phase-sequence phase lack detecting device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095945A (en) * | 2010-12-07 | 2011-06-15 | 广州三晶电气有限公司 | Open-phase detection device for digital three-phase alternating-current phase sequence and detection method thereof |
| CN109490647A (en) * | 2018-12-28 | 2019-03-19 | 常州电站辅机股份有限公司 | The detection device and method of a kind of motor drive mechanism three-phase phase sequence and phase shortage |
-
2010
- 2010-12-07 CN CN 201020644915 patent/CN202049200U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095945A (en) * | 2010-12-07 | 2011-06-15 | 广州三晶电气有限公司 | Open-phase detection device for digital three-phase alternating-current phase sequence and detection method thereof |
| CN102095945B (en) * | 2010-12-07 | 2013-04-10 | 广州三晶电气有限公司 | Open-phase detection device for digital three-phase alternating-current phase sequence and detection method thereof |
| CN109490647A (en) * | 2018-12-28 | 2019-03-19 | 常州电站辅机股份有限公司 | The detection device and method of a kind of motor drive mechanism three-phase phase sequence and phase shortage |
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Granted publication date: 20111123 Effective date of abandoning: 20130410 |
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