CN103995176A - Zero-crossing signal generating method based on signal of coupling coil - Google Patents
Zero-crossing signal generating method based on signal of coupling coil Download PDFInfo
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- CN103995176A CN103995176A CN201410209499.7A CN201410209499A CN103995176A CN 103995176 A CN103995176 A CN 103995176A CN 201410209499 A CN201410209499 A CN 201410209499A CN 103995176 A CN103995176 A CN 103995176A
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Abstract
The invention discloses a zero-crossing signal generating method based on a signal of a coupling coil. The zero-crossing signal generating method includes the following steps: (1) feature pulse signal generating, (2) signal preprocessing, (3) signal sampling, (4) feature matching, and (5) zero-crossing calculating. By means of the zero-crossing signal generating method, a zero-crossing signal is generated through the characteristic that the coupling coil in carrier communication generates the feature pulse signal during the peak of the voltage of commercial power, the method that the zero-crossing signal is generated by an optical coupler needed to be generally adopted in power line carrier application is replaced, and power consumption of a carrier communication module is reduced.
Description
Technical field
The present invention relates to electric system power-line carrier communication field, specifically, relate to a kind of zero cross signal production method based on power carrier pickup coil signal, in power line carrier communication, play an important role.
Background technology
Electric line carrier communication technology is widely used in automatic data logging field, and this communication modes often needs the zero crossing that accurately detects alternating current on line of electric force to realize normal communication.
In existing most of power-line carrier communication system, be to adopt photoelectric coupled circuit to detect and produce zero cross signal, and play the effect of high-low pressure isolation, but this method need to be used the circuit of the combination such as optocoupler and resistance, electric capacity, diode and triode, system bulk greatly also cannot be integrated, also increased power consumption.Patent CN201120373379.2 discloses a kind of zero passage signal detection circuit, and what it adopted is that photoelectric coupled circuit detects; Patent CN201110047473.3 discloses a kind of alternating current zero cross signal Acquisition Circuit, and what it adopted is that photoelectric coupled circuit detects.
In power line carrier communication application, the reception of carrier signal and transmission all complete by pickup coil; Meanwhile, pickup coil can be realized high-low pressure isolation, and the power frequency component of can decaying reaches safe object.
Summary of the invention
1, the technical matters that invention will solve
The object of this invention is to provide a kind of zero cross signal production method of the signal based on pickup coil.Compared with the method that this method produces zero passage with photoelectric coupled circuit, by utilizing the characteristic of existing pickup coil in power line carrier communication, on line voltage, do not produce extra power consumption, can be described as a kind of method of zero-power.
2, technical scheme
Inventive principle: pickup coil is to be formed on magnet ring by transmitting-receiving winding technique, in the time that power-frequency voltage arrives peaking, because changing, magnet ring internal magnetic field direction makes to receive the characteristic pulse signal that produces an about 200us of width on winding, further, carry out low-pass filtering by the characteristic pulse signal receiving at reception winding, it carries out digitized sampling after filter away high frequency noise, to carry out analog-to-digital conversion, the data of sampling are carried out characteristic matching detection, detect the time to peak of line voltage, and then calculate zero crossing.Therefore, thinking of the present invention is by the method for digital sample and characteristic matching, and the characteristic information of detected carrier coupled signal is confirmed the peak point of city's electric signal, thereby calculated zero cross signal.
For achieving the above object, the present invention has adopted following technical scheme:
A zero passage production method based on pickup coil signal, comprises the following steps:
(1) produce characteristic pulse signal, line voltage has been produced to characteristic pulse signal by the pickup coil in carrier communication;
(2) Signal Pretreatment, carries out filtering by characteristic pulse signal by simulation low-pass filter, the high frequency noise in filtered signal;
(3) signal sampling, carries out digitized sampling to filtered signal by analog to digital converter;
(4) characteristic matching, the data of sampling are carried out the signal characteristic value matching detection of pulse by digital processing unit, and the specific implementation process of matching detection is: the signal after sampling carries out related operation with the desired characteristics pulse signal of local storage;
(5) zero passage is calculated, and to the result search maximal value of related operation, confirms the time of occurrence (peak point) of characteristic pulse signal, and then calculates generation zero-signal.
Described desired characteristics pulse signal is: (τ is sin (2 π ft) t), and τ is the decay factor of characteristic pulse signal, and τ > 0, and f is the oscillation frequency of characteristic pulse signal for S (t)=exp.
Described related operation is
wherein: u (n-k) is the digitized signal of analog-to-digital conversion device, and S (k) is desired characteristics pulse signal, and conj () represents conjugate operation, and M is the length of desired characteristics pulse signal.The principle of related operation is, the signal after sampling and the desired characteristics pulse signal degree of approximation are larger, and correlativity is stronger.In the time comprising the characteristic pulse signal of pickup coil generation in the signal of sampling, carry out related operation with the desired characteristics pulse signal of this locality storage, the result of related operation will obtain a peak value, and the time that this peak value is corresponding is exactly the time of the characteristic pulse signal appearance of pickup coil generation.For this feature, the result of related operation is searched for to maximal value, and then obtain the time of occurrence of pulse signal.If detect first time to peak T of line voltage
0, second time to peak T
1, the 3rd time to peak T
2, n-1 time to peak T
n, n time to peak T
n+1, the position in the middle of two adjacent peak values is zero crossing, and the corresponding zero crossing position of line voltage is respectively (T
0+ T
1)/2, (T
1+ T
2)/2 ... (T
n+ T
n+1)/2.
3, beneficial effect
Adopt technical scheme provided by the invention, compared with existing known technology, there is following remarkable result: the present invention utilizes the pickup coil in carrier communication to produce has the characteristic of characteristic pulse signal to produce the method for zero cross signal in the time of line voltage peak value, having substituted in power line carrier application generally needs the optocoupler adopting to produce the method for zero cross signal, the components and parts of optocoupler zero cross detection circuit mesohigh side and low-pressure side are saved, because of pickup coil produce signal in low-pressure side, the processing of signal and detection can be integrated in the inside of chip easily, to reduce the area occupied of circuit board.And because the pickup coil in the present invention itself does not need to increase extra power consumption, thereby reduce the power consumption of carrier communication module.
Brief description of the drawings
Fig. 1 is the principle schematic of zero passage production method of the present invention;
Fig. 2 is that in the present invention, pickup coil receives signal waveform schematic diagram;
Fig. 3 is the schematic diagram of the zero passage production method in the embodiment of the present invention;
In figure: 1, line voltage; 2, safety electric capacity; 3, pickup coil; 4, simulation low-pass filter; 5; Analog to digital converter; 6, digital processing unit.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further detailed explanation.
Embodiment
As shown in figures 1 and 3, a kind of zero passage production method based on pickup coil signal, the safety electric capacity 2 that line voltage 1 is 0.1uF through capacitance is received the high-pressure side winding of pickup coil 3, the output signal of the low-pressure side winding of pickup coil 3 produces the about 200us pulse signal of width at the peak value place of line voltage, as shown in Figure 2;
The signal that pickup coil 3 is exported filters out high frequency noise through simulation low-pass filter 4 and disturbs, send into again analog to digital converter 5 and carry out digitized sampling, sampling condition is: 10bit precision, sampling rate is 50KS/s, the laggard line number word processor 6 of sampling is carried out the signal characteristic value matching detection of pulse, draws the time that peak value occurs.The specific implementation process of signal characteristic value matching detection is: the signal after sampling carries out related operation with the desired characteristics pulse signal of local storage, this desired characteristics pulse signal is that (τ is sin (2 π ft) t) for S (t)=exp, τ is the decay factor of characteristic pulse signal, and τ > 0, f is the oscillation frequency of characteristic pulse signal.Described related operation is
wherein: u (n-k) is the digitized signal of analog-to-digital conversion device, and S (k) is desired characteristics pulse signal, and conj () represents conjugate operation, and M is the length of desired characteristics pulse signal.The principle of related operation is, the signal after sampling and the desired characteristics pulse signal degree of approximation are larger, and correlativity is stronger.In the time comprising the characteristic pulse signal of pickup coil generation in the signal of sampling, carry out related operation with the desired characteristics pulse signal of this locality storage, the result of related operation will obtain a peak value, and the time that this peak value is corresponding is exactly the time of the characteristic pulse signal appearance of pickup coil generation.Based on this, the result of related operation is searched for to maximal value, and then obtain the time of occurrence of pulse signal.
Suppose to detect first time to peak T of line voltage 1
0, second time to peak T
1, the 3rd time to peak T
2, n-1 time to peak T
n, n time to peak T
n+1.Position in the middle of two adjacent peak values is zero crossing, and the corresponding zero crossing position of line voltage is respectively (T
0+ T
1)/2, (T
1+ T
2)/2 ... (T
n+ T
n+1)/2, the cycle that also can calculate line voltage is T
2-T
0.
Above-described embodiment is only preferably scheme of the present invention; not for limiting embodiment of the present invention; those of ordinary skill in the art are according to main design of the present invention and spirit; can carry out very easily corresponding flexible or amendment, therefore protection scope of the present invention should be as the criterion with the desired protection domain of claims.
Claims (8)
1. the zero passage production method based on pickup coil signal, is characterized in that: comprise the following steps: 1) produce characteristic pulse signal; 2) Signal Pretreatment; 3) signal sampling; 4) characteristic matching; 5) zero passage is calculated.
2. a kind of zero passage production method based on pickup coil signal as claimed in claim 1, is characterized in that: described generation characteristic pulse signal refers to that line voltage has produced characteristic pulse signal by the pickup coil in carrier communication.
3. a kind of zero passage production method based on pickup coil signal as claimed in claim 1, is characterized in that: described Signal Pretreatment refers to that the high frequency noise coming in filtered signal by simulation low-pass filter before sampling disturbs.
4. a kind of zero passage production method based on pickup coil signal as claimed in claim 1, is characterized in that: described signal sampling refers to filtered signal is sampled into digital signal by analog to digital converter.
5. a kind of zero passage production method based on pickup coil signal as claimed in claim 1, is characterized in that: described signal characteristic value coupling is, by digital processing unit, the signal after sampling and the desired characteristics pulse signal of local storage are carried out to related operation.
6. a kind of zero passage production method based on pickup coil signal as claimed in claim 1, it is characterized in that: described zero passage is calculated the result search maximal value referring to related operation, confirm the time of occurrence (peak point) of characteristic pulse signal, and then calculate generation zero-signal.
7. a kind of zero passage production method based on pickup coil signal as claimed in claim 5, it is characterized in that: described desired characteristics pulse signal can be characterized by S (t)=exp, and (τ is sin (2 π ft) t), wherein: τ is the decay factor of characteristic pulse signal, and τ > 0, f is the oscillation frequency of characteristic pulse signal.
8. a kind of zero passage production method based on pickup coil signal as claimed in claim 5, is characterized in that: described related operation can be characterized by
wherein: u (n-k) is the digitized signal of analog-to-digital conversion device, and S (k) is desired characteristics pulse signal, and conj () represents conjugate operation, and M is the length of desired characteristics pulse signal.
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|---|---|---|---|
| CN201410209499.7A CN103995176B (en) | 2014-05-16 | 2014-05-16 | Zero-crossing signal generating method based on signal of coupling coil |
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| CN201410209499.7A CN103995176B (en) | 2014-05-16 | 2014-05-16 | Zero-crossing signal generating method based on signal of coupling coil |
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| CN103995176B CN103995176B (en) | 2017-05-03 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01235055A (en) * | 1988-03-15 | 1989-09-20 | Toshiba Corp | Signal level detecting circuit |
| CN102081116A (en) * | 2009-12-01 | 2011-06-01 | 广芯电子技术(上海)有限公司 | Adaptive digital method for detecting zero crossing point of alternating voltage |
| CN102901861A (en) * | 2011-07-28 | 2013-01-30 | 兄弟工业株式会社 | Zero-crossing detector circuit and image forming apparatus having the same |
| CN103063904A (en) * | 2012-12-30 | 2013-04-24 | 青岛东软载波科技股份有限公司 | Zero cross detection circuit |
| US20140035541A1 (en) * | 2012-08-06 | 2014-02-06 | Delta Electronics, Inc. | Control circuit, control method used in pfc circuit and power source system thereof |
-
2014
- 2014-05-16 CN CN201410209499.7A patent/CN103995176B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01235055A (en) * | 1988-03-15 | 1989-09-20 | Toshiba Corp | Signal level detecting circuit |
| CN102081116A (en) * | 2009-12-01 | 2011-06-01 | 广芯电子技术(上海)有限公司 | Adaptive digital method for detecting zero crossing point of alternating voltage |
| CN102901861A (en) * | 2011-07-28 | 2013-01-30 | 兄弟工业株式会社 | Zero-crossing detector circuit and image forming apparatus having the same |
| US20140035541A1 (en) * | 2012-08-06 | 2014-02-06 | Delta Electronics, Inc. | Control circuit, control method used in pfc circuit and power source system thereof |
| CN103063904A (en) * | 2012-12-30 | 2013-04-24 | 青岛东软载波科技股份有限公司 | Zero cross detection circuit |
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| CN103995176B (en) | 2017-05-03 |
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