CN1071257A - Phase discriminator - Google Patents
Phase discriminator Download PDFInfo
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- CN1071257A CN1071257A CN 91108965 CN91108965A CN1071257A CN 1071257 A CN1071257 A CN 1071257A CN 91108965 CN91108965 CN 91108965 CN 91108965 A CN91108965 A CN 91108965A CN 1071257 A CN1071257 A CN 1071257A
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- phase
- phase detector
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Abstract
The present invention relates to a kind of measuring technique of phase place.It is established benchmark, measures square wave level and pulse switching circuit separately between differentiating circuit and phase detector, and phase detector adopts 555 time base circuits composition R-S trigger to carry out work.Its circuit is simple, reliable operation, can improve antijamming capability greatly, measures the rugosity height, resolution height, good linearity, easily digitizing.
Description
The present invention relates to a kind of measuring technique of phase place.
In the energy, electric system, use pointer phase meter at present in a large number, as D3 ∮ type, the core phase discriminator of this phase meter, mainly form by differentiating circuit and phase detector two large divisions, benchmark and measuring-signal are imported phase detector simultaneously after square-wave signal that passage forms is by differentiating circuit separately, bistable state or R-S or D flip-flop that phase detector adopts discrete device to constitute more, the information of the reflection phase differential of phase detector output carries out obtaining phase differential after ∮-processing such as V conversion.The weak point of this phase discriminator is: the precision that operating frequency phase is measured is low, and poor reliability can not satisfy the requirement of production far away.In recent years occur multiple digital power frequency phase meter in succession, be subjected to the restriction of phase discriminator, mostly exist poor anti jamming capability, the poor stability of work, be embodied in numeral and show rising space, even also there is above-mentioned weak point in the 6500A type phasometer of U.S. K.H company when power frequency is measured.
In addition, along with the development of science and technology and production, the phase-detection technology combines with other new technology, has a wide range of applications.Combine the precision measurement that can realize little thickness, little vibration as the phase-detection technology with laser, optical fiber microcomputer technology; Combine water cut that can the precision measurement material and irrelevant with the density of measured matter with microwave technology, microcomputer technology, or the like.
The objective of the invention is to avoid the weak point of existing phase discriminator, and provide a kind of measuring accuracy height, the phase discriminator technology that antijamming capability is strong.
Can take following technical scheme to realize purpose.Phase detector adopts 555 time base circuits to form the R-S trigger to carry out work, and sets up reference square wave between differentiating circuit and phase detector, measure square wave level and pulse switching circuit separately.
In conjunction with the accompanying drawings, embodiment is described in further detail the content of technical scheme.
Fig. 1 is the block scheme of this phase discriminator;
Fig. 2 is a two-way zero-crossing phase discriminator electrical schematic diagram.
This phase discriminator is made up of differentiating circuit, level and pulse switching circuit and phase detector three parts, promptly between differentiating circuit and phase detector, also has reference square wave, measure square wave level and pulse switching circuit separately, and phase detector is the R-S trigger that adopts 555 time base circuits to form, reference signal u
1(t), measuring-signal u
2(t) form square-wave signal, u through passage
1(t) forward position is corresponding to u
1(t) positive going zeror crossing of sinusoidal signal point, u
2(t) back edge is corresponding to u
2(t) the negative sense zero crossing of sinusoidal signal.Is negative level, positive pulse by differentiating circuit and level and pulse switching circuit with the forward position of reference square wave signal (or back along), its pulse height＞2/3Vcc; The back edge (or forward position) of measuring square-wave signal is positive level, negative pulse, its pulse height＜1/3Vcc, it is added the reset terminal R and the set end S of trigger respectively, and then the trigger forward position (or back along) that is output as corresponding reference signal is high level " 1 "; Edge (or forward position) is low level " 0 " behind the corresponding measuring-signal, and the pulse width of phase detector output is exactly the mistiming of reference signal zero crossing and measuring-signal zero crossing like this, promptly realizes phase demodulation.
Because the R-S trigger that 555 time base circuits are formed has two input ends, the polarity of triggering level requires different with threshold voltage again.To the R end, Vr 〉=2/3Vcc is high level " 1 ", and＜2/3Vcc is low level " 0 "; To S end, be low level " 0 " during V s＜1/3Vcc, during＞1/3Vcc high level " 1 ".Exactly because this phase discriminator has utilized these characteristics of 555 time base circuits, undesired signal can not reach its threshold voltage, can not cause false triggering.Therefore compare as phase detector with other R-S trigger circuit, improved the antijamming capability of circuit greatly.
Adopt this phase discriminator optionally to can be the two-way zero-crossing phase discriminator, also can be unidirectional zero passage phase discriminator.Accompanying drawing 2 illustrated embodiments are two-way zero-crossing phase discriminator electrical schematic diagrams, and it adopts two groups of phase demodulations for realizing to before the signal two-way zero-crossing phase demodulation on back edge.The information of the reflection phase differential of phase detector output is advanced ∮-V conversion process, A/D conversion, numeral again and is shown and promptly get phase difference value.C ', R ' composition differentiating circuit, level and pulse switching circuit are by diode VD, resistance R 1 and Sheffer stroke gate G1(G2) be formed by connecting; Reference square wave is by differentiating circuit, the reset terminal R of level and pulse switching circuit input trigger; Measure square wave by differentiating circuit, the set end S of level and pulse switching circuit input trigger.Should satisfy the flat polarity and the amplitude of R, S generating of trigger, the requirement of trigger current to the selection that related parameter is arranged.C among the figure
2Be coupling capacitance.VD can select 3AP9 type or 2CK type pipe for use, and Sheffer stroke gate can be selected CD4049 type device for use, 555 time base circuits adopt ambipolar or the CMOS type all can, but cmos type power consumption can reduce greatly, can be according to single time base circuit 555 or the dual time base circuit 556 selected for use easy to use.
Power supply adopts accurate positive and negative power supply, CB
555Power range 4.5～the 16V that uses; CB
7555The power range that uses is 3～18V, and is bigger.
The relative prior art of this circuit has following advantage:
1, simple, the reliable operation of circuit, can greatly improve jamproof ability: to power frequency disturb, the interference of highfield high-intensity magnetic field and humorous wave action etc. all have preferably result of use, especially the measurement of operating frequency phase is had anti-power frequency and disturbs strong distinct advantages;
2, certainty of measurement height, resolution ratio height, linear good, easy digitlization are applicable to the measurement of 0.01Hz～100KHz low frequency phase;
3, form two-way phase demodulation and also have and overcome the error effect that temperature drift brings, overcome the error effect that even-order harmonic causes;
4, adopt this phase discriminator to make SUN
4165Type numeral power frequency phase meter produces Lu, and except that above-mentioned feature performance benefit, it is little also to have a volume, the outstanding advantage that cost is low.C ' in the circuit=300P, R '=100K, V
0Adopt 3AP
9, its performance index are as follows after testing during R1=100K:
The phase angular region :-180.0 °～0.0 °～+ 180.0 ° direct readings, stable, not rising space
Input signal frequency range: 45Hz～55Hz
Input voltage and input current scope: 10V～220V effective value; 0.05A～5A also can be imported by jack through mutual inductor greater than the electric current of 5A
Display mode: 3 1/2 LCD show
Reading speed: 3 times/second
Accuracy: ± 0.5 °
Resolution: 0.1 °
Harmonic wave suppresses: the waveform distortion of input signal is not more than at 5% o'clock does not influence measuring accuracy.
Claims (2)
1, a kind of phase discriminator, it is by differentiating circuit, phase detector is formed, reference square wave, measurement square wave are transported to phase detector by differentiating circuit separately, it is characterized in that: phase detector is the R-S trigger that adopts 555 time base circuits to form, between differentiating circuit and phase detector, also have reference square wave, measure square wave level and pulse switching circuit separately.
2, phase discriminator as claimed in claim 1 is characterized in that: level and pulse switching circuit are by diode V
D, resistance R 1 and Sheffer stroke gate G1 be formed by connecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91108965 CN1071257A (en) | 1991-09-21 | 1991-09-21 | Phase discriminator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91108965 CN1071257A (en) | 1991-09-21 | 1991-09-21 | Phase discriminator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1071257A true CN1071257A (en) | 1993-04-21 |
Family
ID=4909566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91108965 Pending CN1071257A (en) | 1991-09-21 | 1991-09-21 | Phase discriminator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1071257A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107612038A (en) * | 2017-10-31 | 2018-01-19 | 福建省广通电控有限公司 | A kind of generator auto-parallel system |
-
1991
- 1991-09-21 CN CN 91108965 patent/CN1071257A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107612038A (en) * | 2017-10-31 | 2018-01-19 | 福建省广通电控有限公司 | A kind of generator auto-parallel system |
| CN107612038B (en) * | 2017-10-31 | 2021-02-09 | 福建省广通电控有限公司 | Automatic grid-connected system of generator |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |