CN102081116B - Adaptive digital method for detecting zero crossing point of alternating voltage - Google Patents
Adaptive digital method for detecting zero crossing point of alternating voltage Download PDFInfo
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- CN102081116B CN102081116B CN 200910199782 CN200910199782A CN102081116B CN 102081116 B CN102081116 B CN 102081116B CN 200910199782 CN200910199782 CN 200910199782 CN 200910199782 A CN200910199782 A CN 200910199782A CN 102081116 B CN102081116 B CN 102081116B
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Abstract
The invention discloses an adaptive digital method for detecting the zero crossing point of alternating voltage. The method adopts a comparer and comprises the following steps: changing a sampled output voltage signal passing the comparer into a signal the duty cycle of which is less than 50%; calculating the specific times of a first time and a second time by a clock; then calculating a third time according to the first time and the second time; at the zero crossing point when alternating current becomes negative current from positive current, delaying the sum of the first time and the third time for the raising edge of the output voltage signal; and at the zero crossing point when the alternating current becomes positive current from negative current, delaying the difference between the second time and the third time for the falling edge of the output voltage signal, thus the zero crossing point obtained through calculation is early to ensure that a trigger pulse covers the zero crossing point. The method disclosed by the invention can automatically adapt to multiple voltages and frequencies without manual adjustment.
Description
Technical field
The present invention relates to a kind of alternating voltage zero-crossing point detecting method, particularly relate to a kind of self adapting digital alternating voltage zero-crossing point detecting method.
Background technology
It is by a topic of extensive concern on the switching device zero crossing triggers that the zero crossing of alternating voltage detects.Switching device triggers at zero crossing following these advantages: the dash current in the time of, can reducing circuit turn-on, prolong life-span of switching device, and reduce the power attenuation of switching device; Two, can reduce the clutter of load voltage, if load is responsive to voltage disturbance, can proof load more stably work; Three, little to the electrical network impact, can make product more easily pass through emc testing.So a good zero-crossing detection circuit should guarantee that switching device effectively is triggered, and guarantees again accurately to catch the zero crossing of alternating voltage.
As shown in Figure 1, wherein L and N are respectively the two ends of alternating current, and the dividing potential drop by the first resistance R 1 and the second resistance R 2 produces one and add the linearly proportional input voltage signal Vin of ac signal.As can be seen from Figure 2, for can zero cross fired, the trigger pulse that produces covers zero crossing, express formula u=A*sin (ω t) according to alternating current, setting the trigger pulse that produces is t=T4 along shifting to an earlier date the zero crossing time, can obtain the voltage U 1 that this moment Vin is ordered, i.e. the voltage Vref of comparer.When alternating current from negative during to positive zero passage, the voltage Vref=-U1 of comparer; When alternating current from just to negative zero passage the time, the voltage Vref=U1 of comparer.Trigger pulse (TRIG PULSE) effectively triggers at time-delay a period of time to switching device from the variation bead of output voltage signal Vout, just can finish.
The shortcoming of existing zero crossing detection method is: one, this comparer need to detect a very little voltage, negative voltage particularly, be subjected to the impact of the factors such as technique, deviation and consistance are not fine, and because what detect is definitely planting of voltage, so the result of this impact directly acts on zero crossing; Two, some the time, when interference ratio is larger in the electrical network, can produce distortion at the position voltage waveform near zero crossing, trigger pip is just inaccurate like this, easily causes situation about not triggering to occur; Three, in a lot of applied environments, multivoltage and multifrequency application are more and more, and for comparer, if reference voltage is not specially set, comparison point cannot change thereupon, can't automatically adapt to for multivoltage and multifrequency application.
Summary of the invention
Technical matters to be solved by this invention provides a kind of self adapting digital alternating voltage zero-crossing point detecting method, and it can adapt to automatically for multivoltage and multi-frequency, does not need artificial adjustment.
The present invention solves above-mentioned technical matters by following technical proposals: a kind of self adapting digital alternating voltage zero-crossing point detecting method, it is characterized in that, it adopts a comparer, through the comparer post-sampling to output voltage signal become a dutycycle less than 50 percent signal, utilize a clock calculation to go out the concrete time of the very first time and the second time, calculated for the 3rd time according to the very first time and the second time again, alternating current is from just to negative zero crossing the time, the output voltage signal rising edge delay time again the very first time and the 3rd time and value, and from negative during to positive zero crossing, delay time the again difference of the second time and the 3rd time of the negative edge of output voltage signal, the zero crossing that calculates is in advance to guarantee that trigger pulse covers zero crossing.
Preferably, described the 3rd time is to deduct the very first time the second time to draw 1/4th of difference.
Positive progressive effect of the present invention is: one, comparer does not need to detect negative voltage, even and comparer compensation (offset) more also it doesn't matter because just relative value of its measurement, the compensation meeting is disappeared in the calculating of back; Two, when interference ratio is larger in the electrical network, can produce distortion at the position voltage waveform near zero crossing, but because the voltage that this comparer is measured is higher, distant from zero point, so can avoid former problem; Three, can automatically adapt to for multivoltage and multi-frequency, not need artificial adjustment.
Description of drawings
Fig. 1 is the circuit diagram of existing ac signal sample circuit.
Fig. 2 is the oscillogram of existing zero crossing detection method.
Fig. 3 is the oscillogram of self adapting digital alternating voltage zero-crossing point detecting method of the present invention.
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.
The present invention adopts digital circuit to calculate zero crossing.Under the general state, mains frequency and dutycycle are all more stable, mains frequency refers to a kind of operational factor that electric system is unified, " power system frequency permissible variation " regulation of standard GB/T/T15945-1995 is with the standard frequency (power frequency) of 50Hz sine wave as China's electric system, and the normal frequency standard net capacity of regulation electric system is with 50Hz ± 0.2Hz actual motion at 3000MW and above person, net capacity is with 50Hz ± 0.5Hz actual motion the following person of 3000MW, China each transprovincially the permissible variation of power system frequency all remain on+0.1～-scope of 0.1Hz in.Therefore, electric voltage frequency is the most secure in the quality of power supply at present, utilizes this characteristic, and we just can calculate its zero crossing.Because its frequency is stable secure, we can utilize the zero crossing of the measurement data estimation back waveform of front waveform.The sample circuit of AC signal is still identical with Fig. 1, and its difference is, the voltage Vref of comparer no longer needs a very little voltage, but a larger voltage that relatively is fit to comparer.Through behind the comparer, as shown in Figure 3, the output voltage signal Vout that samples becomes a dutycycle less than 50% signal, suppose that the high time is very first time T1, the low time is the second time T 2, the concrete time of utilizing the clock calculation of a high frequency to go out very first time T1 and the second time T 2, just can calculate the 3rd time T 3=1/4 (T2-T1), alternating current is from just to negative zero crossing the time, the output voltage signal Vout rising edge T1+T3 that delays time again, and from negative be exactly the negative edge of the output voltage signal Vout T2-T3 that delays time again during to positive zero crossing, so just suitably in advance just can guarantee that trigger pulse covers zero crossing to the zero crossing that calculates, the certain width of trigger pulse maintenance causes effective triggering of switching device just can be finished.In the present invention, rise all relevant with the value of the 3rd time T 3 with two zero crossings that descend, and the 3rd time T 3 is proportional with the difference of T2-T1, so the 3rd time T 3 is differential signals, it doesn't matter with the absolute value of very first time T1 and the second time T 2, so just and the absolute value of the voltage Vref of comparer it doesn't matter, the voltage Vref of comparer is so long as the value of a suitable comparer is just passable, and is just lower to the accuracy requirement of comparer like this.And because the present invention calculates the zero crossing of back by the data before the sampling, so and the voltage of alternating current itself and frequency all it doesn't matter, it is just passable that the frequency that needs only alternating current is held constant at a scope.
The present invention has the following advantages: one, comparer does not need to detect negative voltage, even and comparer offset larger, also it doesn't matter because just relative value of its measurement, offset can be disappeared in the calculating of back; Two, when interference ratio is larger in the electrical network, can produce distortion at the position voltage waveform near zero crossing, but because the voltage that this comparer is measured is higher, distant from zero point, so can avoid former problem; Three, can automatically adapt to for multivoltage and multi-frequency, not need artificial adjustment.
Although more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, under the prerequisite that does not deviate from principle of the present invention and essence, can make various changes or modifications to these embodiments.Therefore, protection scope of the present invention is limited by appended claims.
Claims (1)
1. self adapting digital alternating voltage zero-crossing point detecting method, it is characterized in that, it adopts a comparer, through the comparer post-sampling to output voltage signal become a dutycycle less than 50 percent signal, utilize a clock calculation to go out the concrete time of the very first time and the second time, calculated for the 3rd time according to the very first time and the second time again; Described the 3rd time is to deduct the very first time the second time to draw 1/4th of difference; Alternating current is from just to negative zero crossing the time, the output voltage signal rising edge delay time again the very first time and the 3rd time and value, and from negative during to positive zero crossing, delay time the again difference of the second time and the 3rd time of the negative edge of output voltage signal, the zero crossing that calculates is in advance to guarantee that trigger pulse covers zero crossing.
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102121950A (en) * | 2010-12-21 | 2011-07-13 | 厦门拓能信息科技有限公司 | Method for zero crossing detection of adaptive alternating-current voltage |
| US9250274B2 (en) | 2011-08-25 | 2016-02-02 | Asco Power Technologies, L.P. | Power analysis module for monitoring an electrical power source |
| CN103595387A (en) * | 2013-11-20 | 2014-02-19 | 厦门市芯阳科技有限公司 | Silicon controlled rectifier triggering control method |
| CN103995176B (en) * | 2014-05-16 | 2017-05-03 | 南京能瑞自动化设备股份有限公司 | Zero-crossing signal generation method based on coupling coil signals |
| CN105656332B (en) * | 2016-04-06 | 2018-08-21 | 上海联矽智能科技有限公司 | A method of using rectification dead zone be low-voltage power supply |
| CN106199160B (en) * | 2016-08-31 | 2019-02-26 | 杭州康奋威科技股份有限公司 | Voltage zero-crossing point of power grid detection method and detection device |
| CN107490720A (en) * | 2017-09-21 | 2017-12-19 | 源初（广州）科技有限公司 | Digital detection device and detection method for zero crossing point of power grid voltage |
| CN107656132B (en) * | 2017-09-30 | 2021-07-13 | 漳州科能电器有限公司 | Correction method for alternating voltage zero crossing point detection of power carrier module |
| CN109085414B (en) * | 2018-08-10 | 2021-06-11 | 深圳和而泰智能控制股份有限公司 | Voltage detection method and device |
| CN109633236B (en) * | 2018-12-13 | 2021-06-22 | 成都精位科技有限公司 | Radio signal identification method and device |
| CN112129993B (en) * | 2019-06-24 | 2023-09-12 | 天地融科技股份有限公司 | Zero crossing signal output and power line data transmission method and device |
| CN114371642A (en) * | 2019-12-24 | 2022-04-19 | 追觅科技(上海)有限公司 | Equipment control method, device and storage medium |
| CN111289943B (en) * | 2020-02-28 | 2024-07-19 | 深圳市科陆精密仪器有限公司 | Verification method and system for electric energy meter |
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Address after: 200030, room 1, building 33, No. 305, Leshan Road, Shanghai Patentee after: Core electronic technology (Shanghai) Limited by Share Ltd Address before: 200030, room 1, building 33, No. 305, Leshan Road, Shanghai Patentee before: Broadchip Technology Group Ltd. |