CN1243249C - Circuit load property and its voltage-current phase difference measuring method and apparatus - Google Patents
Circuit load property and its voltage-current phase difference measuring method and apparatus Download PDFInfo
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- CN1243249C CN1243249C CN 03153148 CN03153148A CN1243249C CN 1243249 C CN1243249 C CN 1243249C CN 03153148 CN03153148 CN 03153148 CN 03153148 A CN03153148 A CN 03153148A CN 1243249 C CN1243249 C CN 1243249C
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Abstract
The present invention relates to a circuit load property and its voltage-current phase difference measuring method and apparatus. The present invention has the technical scheme that based on the displacement comparison principle of a dual frequency superposition signal, the resistance performance, the capacitance performance and the inductance performance of a definite circuit load are measured under the condition of only obtaining a current signal, and the phase difference of the voltage and the current of the definite circuit load is obtained and is indicated by an indicating device.
Description
The present invention relates to Electric Measurement Technology, specifically, it relates to the measuring method and the equipment of load characteristic in the circuit and voltage and current and phase difference.
Circuit load is divided into that three kinds of character is promptly resistive, capacitive, perception.Because the difference of load characteristic, voltage is also different with the phase differential of electric current in the circuit: the phase place of voltage and electric current is identical when resistive; Voltage-phase lags behind current phase during capacitive; Voltage-phase is ahead of current phase during perception.Capacitive or perception are strong more, and phase differential is big more, and its scope is: greater than 0 ° less than 90 °.In real work, we need learn the character and the electric current and voltage phase differential thereof of load sometimes.
Known measuring method is that AC signal is added in the tested load, the electric current of the voltage at sensing lead two ends and the load of flowing through is obtained the zero crossing of both waveforms, and then its gap is a phase differential, available digital counting mode or analog integration mode draw respective phase difference value.According to the front and back of electric current and voltage zero crossing, judge leading and lagged relationship, can determine load characteristic.Just can compare measurement but this method must obtain the voltage and current signal simultaneously, as be subjected to condition restriction can only obtain current signal, and can not obtain voltage signal the time, then can't measure.
The objective of the invention is to propose a kind of need and obtain the method and apparatus that current signal can record load characteristic and electric current and voltage phase differential thereof.So just can use sensing device, as coil or hall device or magnetoresistance device electric current is isolated the induction sampling after, record load characteristic and electric current and voltage phase differential thereof.
The present invention measures according to double frequency superposed signal displacement comparison principle.The objective of the invention is to realize by following method and apparatus.
A kind of circuit load character and electric current and voltage Measurement of Phase difference thereof, it comprises the following steps:
1. establish signal generation apparatus, can produce the voltage signal of high and low two kinds of different frequencies;
2. this high and low frequency voltage signal is superposeed, form double frequency superimposed voltage signal;
3. this double frequency superimposed voltage signal is sent in the load, produces the double frequency superimposed current;
4. use electromagnetic inductor spare, induction receives the double frequency superimposed current signal of this load of flowing through;
5. obtain the position of the stack of double frequency in the received signal, make comparisons with superposed positions in the known former transmission signal, its side-play amount is phase differential, and load characteristic has been represented in the offset direction;
6. low frequency signal is considered as current signal, high-frequency signal is considered as voltage signal, then relatively both leading and hysteresis can be judged load characteristic;
7. by indicating device indication load characteristic and phase differential.
The measuring equipment of realizing said method comprises:
1. the high and low frequency signal generation apparatus is located in the transmitter, is produced the double frequency superposed signal;
2. use the pincerlike dop that has electromagnetic induction coil as receiving head, induction receives the double frequency superposed signal on the lines;
3. receive head induced signal is delivered to receiver, the offset direction of being calculated the double frequency superposed positions by circuit analysis wherein is that load characteristic and side-play amount are phase differential, and is indicated by indicating device.
The present invention can judge load characteristic and electric current and voltage phase differential under the situation that only obtains loop current signals.Thereby receiving unit can adopt sensing device that current signal is isolated sampling, and sampling isolation height is measured with measured system and do not disturbed mutually, and is easy to use.
Fig. 1 is an electrical block diagram of the present invention;
Fig. 2 is a transmitter output waveform analysis chart;
Receiver wave form analysis figure when Fig. 3 is resistive load;
Receiver wave form analysis figure when Fig. 4 is capacitive load;
Describe optimum implementation of the present invention in detail below in conjunction with each accompanying drawing.
Fig. 1 is the inventive circuit structural representation.
Be provided with low frequency signal generating means 2 and high-frequency signal generating means 3 in the transmitter 1, the high and low frequency voltage signal superposeed serve circuit 7 after forming double frequency superimposed voltage signal, constitute loops, then in the circuit 7 double frequency superimposed current signal will be arranged through load 8.The pincer that will have a solenoid receives 4 and is stuck on the circuit 7, after induction receives double frequency superimposed current signal, this induced signal is sent into receiver 5, carry out analytical calculation by wherein circuit, draw double frequency offset direction and side-play amount, can learn load characteristic and phase differential, and it be indicated by indicating device 6.
Fig. 2 is a transmitter output waveform analysis chart.
The voltage waveform that waveform 9 is produced for low frequency signal generating means 2, the voltage waveform that waveform 10 is produced for high-frequency signal generating means 3, every section high frequency waves are begun stack at each positive going zeror crossing point place of low frequency wave, become and send voltage waveform 11, it is added on the circuit 7, then form electric current through overload 8.
Receiver wave form analysis figure when Fig. 3 is resistive load.
Receiver wave form analysis figure when Fig. 4 is capacitive load.
For ease of explanation, we are that pure electric capacity is that example is analyzed with load 8, and waveform 17 is for receiving 4 current signal that receive.Because load 8 be pure capacitive, so all leading 90 ° in the interior high and low frequency electric current of circuit 7 with respect to voltage.Because two wave frequency differences, the wavelength difference is so though leading angle is identical, the distance that waveform moves on transverse axis is different.Though find out that by waveform 17 two ripples have all moved distance that 90 ° but low frequency wave move greater than high frequency waves on transverse axis, it is identical that the multiple that differs and frequency differ multiple.Circuit in the receiver 5 from forming low frequency waveform 18 and high frequency waveforms 19, is pressed two wavelength-divisions preceding method with both and is handled back formation voltage square wave waveform 20 and electric current rectangle wave-wave shape 21.The forward position of comparing both, find that then electric current is ahead of voltage and is capacitive, leading angle is that reference period value and side-play amount compare with complete electric current square-wave waveform 20 then, side-play amount accounts for 1/4 of 20 cycles of low-frequency square-wave waveform as can be seen, promptly 360 ° 1/4, be 90 °, 90 ° of indicating device 6 indication capacitives.If load 8 is not pure electric capacity, but resistance capacitance and depositing, then phase differential will be greater than 0 ° of angle less than 90 °.Can find out that by above-mentioned analysis it is big more that the high and low frequency frequency differs, be convenient to more measure, be tending towards accurate more.Certainly, the error amount because of the high-frequency signal skew is produced can be compensated by compensating circuit.So, we obtain the position of the stack of double frequency in the received signal by waveform 20 and waveform 21, make comparisons with superposed positions in the known former transmission voltage waveform 11, and its side-play amount is a phase differential, and load characteristic is represented in the offset direction.And this moment waveform 20 90 ° in the forward position of the leading waveform 21 in forward position, expression is compared with waveform 11, low frequency signal 9 leading 90 °, this leading angle side-play amount is phase differential, the offset direction be leading, think capacitive load.
As a same reason, when load 8 is inductive load, the forward position of electric current square wave will lag behind the forward position of voltage square wave, and promptly current phase lags behind voltage-phase, and numerical value is also determined by side-play amount.Indicating device 6 will be indicated perception and phase differential angle.
Indicating device 6 can be indicated by electronic pointer-type or lumination of light emitting diode bar formula or liquid crystal display method, both can indicate offset direction, just load characteristic; Can indicate side-play amount again, just phase differential angle value.We can mark out an end and be capacitive C end, and the other end is perceptual L end, and resistive R is placed in the middle, and the mark scale is convenient to recognize and is read.
By analyzing, we it can also be seen that: if receive 4 reverse directions, it is the receiving head coil direction of having reversed, the low-and high-frequency sinusoidal signal that then receives also will be reversed 180 °, the electric current square wave is by the low frequency signal shaping, so also overturn 180 °, and the voltage square-wave signal is through the detection shaping, so also nonreversible by high-frequency signal.Like this, relatively the forward position of two waveform signals then decidable receive 4 directions of having reversed.Conversely speaking, if receive 4 a not counter-rotating, and counter-rotating has taken place in current square-wave signal, illustrates that then counter-rotating has taken place the two-frequency signal current direction in the circuit 7.Utilize this principle, we can judge the flow direction of double frequency electric current, and can be indicated.
Claims (2)
1. circuit load character and electric current and voltage Measurement of Phase difference thereof, it comprises the following steps:
(1). establish signal generation apparatus, can produce the voltage signal of high and low two kinds of different frequencies;
(2). this high and low frequency voltage signal is superposeed, form double frequency superimposed voltage signal;
(3). this double frequency superimposed voltage signal is sent in the load, produces the double frequency superimposed current;
(4). receive the double frequency superimposed current signal of this load of flowing through with the induction of electromagnetic inductor spare;
(5). obtain the position of the stack of double frequency in the received signal, make comparisons with superposed positions in the known former transmission signal, its side-play amount is a phase differential, and load characteristic has been represented in the offset direction;
(6). low frequency signal is considered as current signal, high-frequency signal is considered as voltage signal, relatively both leading and hysteresis can be judged load characteristic;
(7). by indicating device indication load characteristic and phase differential.
2. one kind is used the described method of claim 1 and custom-designed measuring equipment, and it comprises:
(1). the high and low frequency signal generation apparatus is located in the transmitter, is produced the double frequency superposed signal;
(2). as receiving head, induction receives the double frequency superposed signal on the lines with the pincerlike dop that has electromagnetic induction coil;
(3). receive head induced signal is delivered to receiver, the offset direction of being calculated the double frequency superposed positions by circuit analysis wherein is that load characteristic and side-play amount are phase differential, and is indicated by indicating device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03153148 CN1243249C (en) | 2003-08-08 | 2003-08-08 | Circuit load property and its voltage-current phase difference measuring method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03153148 CN1243249C (en) | 2003-08-08 | 2003-08-08 | Circuit load property and its voltage-current phase difference measuring method and apparatus |
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| Publication Number | Publication Date |
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| CN1488948A CN1488948A (en) | 2004-04-14 |
| CN1243249C true CN1243249C (en) | 2006-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 03153148 Expired - Fee Related CN1243249C (en) | 2003-08-08 | 2003-08-08 | Circuit load property and its voltage-current phase difference measuring method and apparatus |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808060B (en) * | 2014-01-26 | 2017-12-15 | 南京邮电大学 | A kind of digital measuring method of electrical signal phase difference |
| US11114947B2 (en) * | 2016-10-28 | 2021-09-07 | Intelesol, Llc | Load identifying AC power supply with control and methods |
| CN108196122B (en) * | 2018-02-24 | 2023-05-02 | 深圳世格赛思医疗科技有限公司 | Waveform phase identification method, device, system, computer and storage medium |
| CN111044784A (en) * | 2020-01-03 | 2020-04-21 | 云南电网有限责任公司电力科学研究院 | Load impedance angle obtaining method and device |
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