CN103499732B - A kind of two-way zero-crossing testing circuit - Google Patents
A kind of two-way zero-crossing testing circuit Download PDFInfo
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- CN103499732B CN103499732B CN201310454596.8A CN201310454596A CN103499732B CN 103499732 B CN103499732 B CN 103499732B CN 201310454596 A CN201310454596 A CN 201310454596A CN 103499732 B CN103499732 B CN 103499732B
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Abstract
The invention discloses a kind of two-way zero-crossing testing circuit and method thereof, including: input signal end, it is provided that a stable sinusoidal signal, its frequency determines the precision of accurate timing；Waveform modular converter, carries out twice conversion by input end signal, first by the square-wave waveform of the amplitudes such as sinusoidal wave form is converted to, then the waveform of sharp pulses by amplitudes such as square-wave waveform are converted to；Waveform separation module, is separated into positively and negatively waveform by waveform of sharp pulses, and forward waveform is directly output as positive going zeror crossing detection waveform；Reverse process device, is processed as reverse zero passage detection waveform by negative sense waveform.
Description
Technical field
The present invention relates to single chip communication and control field, particularly relating to one both can provide
Interrupt zero passage detection, again can accurately the two-way zero-crossing testing circuit of timing and method.
Background technology
At present, many computer control systems, in order to realize the control to high power load, use
Silicon controlled power modulation mode controls bearing power, and wherein accurately triggering of power of controlled silicon device is one
Individual key technology.How to realize triggering signal and the synchronization of power supply signal, it is ensured that control precisely,
The zero passage detection of ac supply signal is key therein.Existing zero passage detection method major part
The mode such as electric resistance partial pressure or stabilivolt pressure of employing carries out waveform conversion and obtains zero crossing, although real
Now easy, but it is not provided that the signal of two-way zero-crossing detection accurately, it is impossible to form Single-chip Controlling
Interrupt signal accurately required for system, and said method is in waveform transformation process, by
In the factor such as jitter, noise, zero crossings generation effect of jitter can be made, easily affect
Shake is mistaken for zero point, so will directly affect control accuracy.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides one and can export two-way
Zero passage detection signal, it is ensured that phase place occurs without deviation, and the two-way zero-crossing detection of energy accurately timing
Circuit.
The present invention solves the technical scheme that the problems referred to above are used:
A kind of two-way zero-crossing testing circuit, including input signal end, it is provided that one stable just
String signal, its frequency determines the precision of accurate timing；Waveform modular converter, by input signal
The sinusoidal signal of end carries out twice conversion, first by the square-wave waveform of the amplitudes such as sinusoidal wave form is converted to,
Again by the waveform of sharp pulses of the amplitudes such as square-wave waveform is converted to；Waveform separation module, by spike
Waveform is separated into forward waveform and negative sense waveform, and forward waveform is directly output as positive going zeror crossing detection
Waveform；Reverse process device, is processed as negative sense zero passage detection waveform, described ripple by negative sense waveform
Shape modular converter, comprises two band filter RC circuit, resistance R113 and electric capacity C43 group
Become first RC circuit；R117 Yu C44 forms second RC circuit；Input ac voltage
Or current sinusoidal signal forward connecting resistance R113, by electric capacity C43 ground connection again；Protective resistance
It is respectively R114 and R110, R114 and connects the positive pole of operational amplifier LM258, R110 one end
Meeting electric capacity C43, one end is connected with the negative pole of operational amplifier LM258；Operational amplifier LM258
Output bifurcation, one meets power supply VCC by protective resistance R109, and another connects second
The electric capacity C44 of filter circuit, divides two-way again after electric capacity C44 filters, leads up to resistance R117
Ground connection, another road connects waveform separation module below.
This waveform modular converter also comprises the electric capacity in parallel with operational amplifier.
The operational amplifier that this zero cross detection circuit is comprised is dual operational amplifier.
The waveform separation module that this zero cross detection circuit is comprised, including two protective resistances R111,
R112 and a bridge circuit, bridge circuit comprises four diodes, respectively D23, D24,
D25, D26, specified forward operating current is 1A；The output of waveform modular converter connects two simultaneously
Diode D23, D24, a positive pole meeting D23, after D23, protection of leading up to is electric
Resistance R111, exports positive going zeror crossing detection waveform, and a road connects the negative pole of D25, and the positive pole of D25 connects
Ground；The output of waveform modular converter connects the negative pole of D24 simultaneously, after D24, then divides two-way, and one
Road connects the positive pole of D26 by protective resistance R122 to reverse process device, a road, and D26's is negative
Pole ground connection.
Reverse process device included by this zero cross detection circuit, including two protective resistances R119,
R116, a backward resistance R108, the output of waveform separation module connects the negative of operational amplifier
Pole, simultaneously also by backward resistance R108, connects the output of operational amplifier, operational amplifier
Positive pole by protective resistance R119 ground connection；The output of operational amplifier connects protective resistance R116,
Output negative sense zero passage detection waveform.
Compared with prior art, the invention has the beneficial effects as follows, provide accurate double for single-chip microcomputer
To zero passage interrupt signal, ensure there is no phase deviation, it is achieved accurately timing simultaneously.
Accompanying drawing explanation
Fig. 1 is two-way zero-crossing testing circuit flow chart；
Fig. 2 is the waveform changing circuit of the two-way zero-crossing testing circuit embodiment of the present invention.
Fig. 3 is the waveform split circuit of the two-way zero-crossing testing circuit embodiment of the present invention.
Fig. 4 is the bridge in the waveform split circuit of the two-way zero-crossing testing circuit embodiment of the present invention
Formula circuit.
Fig. 5 is the reverse process device circuit of the two-way zero-crossing testing circuit embodiment of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
Present invention is mainly applied to the zero passage detection of AC signal, by alternating voltage (or electricity
Stream) sinusoidal wave form carry out zero passage detection, obtain moment or the zero-acrross ing moment of AC signal zero crossing
Pulse signal, this pulse signal is input to high accurate calculagraph, by the time delay meter of timer
Time, the triggering signal arbitrarily requiring the moment of high-power silicon controlled rectifier device can be given.Enumerator
Precision is the highest, controls to trigger pulse the most accurate.Due to developing rapidly and extensively of computer technology
Application, triggers control technology and increasingly develops to digitized direction.Fig. 1 is the inventive method
Process principle figure, first by input signal end input sine wave carry out waveform conversion, conversion
For the square-wave signal with the amplitude such as sinusoidal wave, then by RC circuit, square-wave signal is converted into
The positive and negative spike signal having pulse in zero position excessively of sine wave signal, obtain is positive and negative
After spike signal, carry out waveform separation, positive and negative biphase spike, due to single-chip microcomputer only
Forward waveform can be identified, so the negative sense waveform obtained needs, through reverse process device, to obtain
It is required negative sense zero passage detection waveform.
Fig. 2 is the waveform modular converter circuit theory diagrams in this circuit, comprises two bandpass filterings
Device RC circuit, resistance is R113 and electric capacity is that C43 forms above-mentioned low-pass filtering, is first
Individual RC circuit, this passive low-pass filter circuit, for first-order system, is by high frequency signal attenuation
Circuit.R117 Yu C44 forms second RC circuit, is peaker, and this circuit is defeated
Entering signal is square wave, by the differential to this square wave, original square-wave waveform is converted to point arteries and veins
Punching.Input ac voltage (or electric current) sinusoidal signal forward connects the resistance of this band filter
R113, by electric capacity C43 ground connection again；Protective resistance is respectively R114 and R110, R114 and connects
The positive pole of operational amplifier LM258, R110 mono-termination capacitor 43 ground, one end and operation amplifier
The negative pole of device LM258 is connected；Operational amplifier LM258 exports bifurcation, and one connects protection electricity
Resistance R109, meets power supply VCC simultaneously, and another connects the electric capacity C44 of second filter circuit, warp
Two-way, a road connecting resistance R117, ground connection is divided again, after another road connects after electric capacity C44 filtering
Waveform separation module.
Fig. 3 is the waveform separation module of this circuit, comprises two protective resistances R111, R112
With a bridge circuit (such as Fig. 4), bridge circuit comprises four diodes, respectively D23,
D24, D25, D26, specified forward operating current is 1A.The output of waveform modular converter connects simultaneously
Two diodes D23, D24, a positive pole meeting D23, after D23, lead up to guarantor
Protecting resistance R111, export positive going zeror crossing detection waveform, a road connects the negative pole of D25, then ground connection；
The output of waveform modular converter connects the negative pole of D24 simultaneously, then divides two-way, leads up to protective resistance
R122 is to reverse process device, and a road connects the positive pole of D26, then ground connection.
Fig. 4 is a kind of typical bridge-type single-phase full-wave rectifer circuit, is possible not only to alternating current to turn
Being changed to unidirectional current, and power utilization rate is low, output voltage is steady.The feature of four nodes:
1 point being connected with the opposed polarity end that 3 is two neighboring diode, receives transformator
On secondary windings；2 points being connected with the identical polar end that 4 is two neighboring diode,
Receive in load；2 is the point that the negative pole end of two neighboring diode is adjacent, is just connecing load voltage
Extremely, 4 be neighboring diode positive terminal be connected point, connect load voltage negative pole end.Four
Individual diode is linked to be a feature during loop: ensure each diode and adjacent two poles
Pipe is along string, and another neighboring diode is played a reversed role.
Fig. 5 is the reverse process device of this circuit, including two protective resistances R119, and R116, one
Individual backward resistance R108, the output of waveform separation module connects the negative pole of operational amplifier, simultaneously
Also by backward resistance R108, connecing the output of operational amplifier, the positive pole of operational amplifier connects
Protective resistance R119, then ground connection；The output of operational amplifier connects protective resistance R116, output
Negative sense zero passage detection waveform
Operational amplifier in Fig. 5 is the two-way operational amplifier of a low-power consumption, and inside includes
There is dual operational amplifier that two independent, that high-gain, internal frequency compensate, be suitable for power supply
The single supply use that voltage range is the widest, is also applied for dual power supply mode of operation, in the work recommended
Under the conditions of work, source current is unrelated with supply voltage.Its range includes that sensor amplifies
The field using operational amplifier that device, DC current gain module and other all available single supplies are powered
Close.
Compared with prior art, the zero cross detection circuit of the electric meter system of the present invention, have has
Benefit effect includes:
1, can realize accurately detecting the zero crossing of alternating voltage (or electric current) sinusoidal signal；
2, positively and negatively two zero crossings of each cycle are all for extracting phase information；
3, phase information is extracted from the zero crossing of sinusoidal signal, can be greatly improved phase place and survey
The sensitivity of amount and precision；
4, there is not phase deviation in two-way zero-crossing detection；
5, as run into the two-way zero-crossing such as harmonic wave, direct current biasing, noise detection error just,
It is worth equal, opposite polarity at negative sense zero crossing with it, utilizes the complementarity of error,
Employing two-way zero-crossing detects, and is averaged, and measurement error can be made to reduce to
Little.
6, capacity of resisting disturbance is strong；
7, affected little by factors such as ambient temperatures, working stability, reliable.
Foregoing, only presently preferred embodiments of the present invention, be not intended to limit the reality of the present invention
Executing scheme, those of ordinary skill in the art are according to the central scope of the present invention and spirit, Ke Yishi
Divide and carry out corresponding flexible or amendment easily, therefore protection scope of the present invention should be with claim
Protection domain required by book is as the criterion.
Claims (5)
1. a two-way zero-crossing testing circuit, it is characterised in that including: input signal end, it is provided that
One stable sinusoidal signal, its frequency determines the precision of accurate timing；Waveform modular converter,
The sinusoidal signal of input signal end is carried out twice conversion, first by amplitudes such as sinusoidal wave form are converted to
Square-wave waveform, then the waveform of sharp pulses by amplitudes such as square-wave waveform are converted to；Waveform splitting die
Block, is separated into forward waveform and negative sense waveform by waveform of sharp pulses, and forward waveform is directly output as
Positive going zeror crossing detection waveform；Reverse process device, is processed as negative sense zero passage detection ripple by negative sense waveform
Shape, described waveform modular converter, comprise two band filter RC circuit, resistance R113
First RC circuit is formed with electric capacity C43；R117 Yu C44 forms second RC circuit；
Input ac voltage or current sinusoidal signal forward connecting resistance R113, connect by electric capacity C43 again
Ground；Protective resistance is respectively R114 and R110, R114 and connects the positive pole of operational amplifier LM258,
R110 mono-termination capacitor C43, one end is connected with the negative pole of operational amplifier LM258；Computing is put
Big device LM258 exports bifurcation, and one meets power supply VCC by protective resistance R109, another
Prop up the electric capacity C44 connecing second filter circuit, after electric capacity C44 filters, divide two-way, a road again
By resistance R117 ground connection, another road connects waveform separation module below.
Two-way zero-crossing testing circuit the most according to claim 1, it is characterised in that this waveform
Modular converter also comprises the electric capacity in parallel with operational amplifier.
Two-way zero-crossing testing circuit the most according to claim 1, it is characterised in that this zero passage
The operational amplifier that testing circuit is comprised is dual operational amplifier.
Two-way zero-crossing testing circuit the most according to claim 1, it is characterised in that described ripple
Shape separation module, including two protective resistances R111, R112 and a bridge circuit, bridge-type
Circuit comprises four diodes, respectively D23, D24, D25, D26, and specified forward works
Electric current is 1A；The output of waveform modular converter meets two diodes D23, D24 simultaneously, and one connects
The positive pole of D23, after D23, leads up to protective resistance R111, output positive going zeror crossing detection
Waveform, a road connects the negative pole of D25, the plus earth of D25；The output of waveform modular converter is simultaneously
Connect the negative pole of D24, after D24, then divide two-way, lead up to protective resistance R122 to anti-
To processor, a road connects the positive pole of D26, the minus earth of D26.
Two-way zero-crossing testing circuit the most according to claim 1, it is characterised in that described
Reverse process device, including two protective resistances R119, R116, a backward resistance R108,
The output of waveform separation module connects the negative pole of operational amplifier, simultaneously also by backward resistance
R108, connects the output of operational amplifier, and the positive pole of operational amplifier passes through protective resistance R119
Ground connection；The output of operational amplifier connects protective resistance R116, exports negative sense zero passage detection waveform.
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| CN201310454596.8A CN103499732B (en) | 2013-09-29 | 2013-09-29 | A kind of two-way zero-crossing testing circuit |
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| CN201310454596.8A CN103499732B (en) | 2013-09-29 | 2013-09-29 | A kind of two-way zero-crossing testing circuit |
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| CN103499732B true CN103499732B (en) | 2016-09-14 |
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| CN103825471B (en) * | 2014-03-12 | 2016-10-12 | 河北工业大学 | For driving the variable-frequency power sources of middle-size and small-size magnetostrictive transducer |
| CN107367633B (en) * | 2016-05-11 | 2019-08-27 | 佛山市顺德区美的电热电器制造有限公司 | Zero-cross processing method, device and equipment for voltage zero-crossing detection circuit |
| CN108258885B (en) * | 2016-12-28 | 2020-03-31 | 上海沪工焊接集团股份有限公司 | Inverter welding power supply drive control device |
| CN109799384B (en) * | 2017-11-16 | 2020-11-20 | 佛山市顺德区美的电热电器制造有限公司 | Voltage zero-crossing detection method and device and cooking appliance |
| CN109900954A (en) * | 2017-12-11 | 2019-06-18 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its voltage sampling method, device |
| CN108872695B (en) * | 2018-07-04 | 2020-08-14 | 广东省测试分析研究所（中国广州分析测试中心） | Two-phase zero-crossing signal detection circuit and optical fiber signal transmission system |
| CN110346637A (en) * | 2019-08-23 | 2019-10-18 | 邢台子中电子科技有限公司 | A kind of method and device of sinusoid information Digital Extraction |
| CN110646804B (en) * | 2019-11-05 | 2021-05-18 | 中国电子科技集团公司第四十四研究所 | Pulse time discriminating circuit based on double-pulse laser signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| ZA805412B (en) * | 1979-09-14 | 1981-08-26 | Plessey Overseas | Zero-crossing comparators with threshold validation |
| CN201219251Y (en) * | 2008-07-16 | 2009-04-08 | 上海大学 | Zero crossing detector and edge-pulse transducer and use thereof |
| CN101398447B (en) * | 2008-10-30 | 2011-03-30 | 上海大学 | Zero-crossing detector, edge-impulse transferor and use thereof |
| CN101943714B (en) * | 2009-07-10 | 2012-08-15 | 戴维逊磁疗技术（厦门）有限公司 | Precise detection method of thyristor AC signal zero passage time sequence and device |
| CN202025037U (en) * | 2011-04-14 | 2011-11-02 | 合肥荣事达三洋电器股份有限公司 | Zero crossing detecting circuit |
| JP5684064B2 (en) * | 2011-07-28 | 2015-03-11 | ブラザー工業株式会社 | Zero-cross detection circuit and image forming apparatus having the detection circuit |
| CN202256476U (en) * | 2011-09-30 | 2012-05-30 | 海信科龙电器股份有限公司 | Zero passage signal detection circuit |
| CN202583311U (en) * | 2012-04-13 | 2012-12-05 | Tcl空调器(中山)有限公司 | Alternating current zero-crossing detection circuit |
| CN202886459U (en) * | 2012-09-29 | 2013-04-17 | 广东美的制冷设备有限公司 | Digital zero cross detection circuit and household air-conditioner |
| CN203191441U (en) * | 2013-04-18 | 2013-09-11 | 吴德葆 | Alternating current zero-cross detection circuit |
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| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Huang Huixian Inventor after: Ren Keming Inventor after: Chen Zibin Inventor after: Zhao Weijuan Inventor after: Li Yan Inventor after: Ou Xinlei Inventor after: Zhou Jiewen Inventor after: Zhuang Xuan Inventor after: Li Bin Inventor after: Chen Lisha Inventor after: Hu Chao Inventor before: Huang Huixian Inventor before: Ren Keming Inventor before: Chen Zibin Inventor before: Li Yan Inventor before: Zhao Weijuan Inventor before: Ou Xinlei Inventor before: Zhou Jiewen Inventor before: Zhuang Xuan Inventor before: Li Bin Inventor before: Chen Lisha Inventor before: Hu Chao |
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Free format text: CORRECT: INVENTOR; FROM: HUANG HUIXIAN LI YAN ZHAO WEIJUAN OU XINLEI ZHOU JIEWEN ZHUANG XUAN LI BIN CHEN LISHA HU CHAO REN KEMING CHEN ZIBIN TO: HUANG HUIXIAN ZHAO WEIJUAN LI YAN OU XINLEI ZHOU JIEWEN ZHUANG XUAN LI BIN CHEN LISHA HU CHAO REN KEMING CHEN ZIBIN |
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Granted publication date: 20160914 Termination date: 20190929 |