CN201203647Y - AC zero-cross detection circuit and electric force carrier adapter with the same - Google Patents
AC zero-cross detection circuit and electric force carrier adapter with the same Download PDFInfo
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- CN201203647Y CN201203647Y CNU2008200231839U CN200820023183U CN201203647Y CN 201203647 Y CN201203647 Y CN 201203647Y CN U2008200231839 U CNU2008200231839 U CN U2008200231839U CN 200820023183 U CN200820023183 U CN 200820023183U CN 201203647 Y CN201203647 Y CN 201203647Y
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- optocoupler
- detection circuit
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- fire line
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Abstract
The utility model discloses an AC zero-crossing detecting circuit and a power carrier adapter. An optical coupler is serially connected to an AC circuit, a single optical coupler forms a detecting circuit, the AC zero-crossing detection is realized according to the output of the optical couple circuit, the reliability is high, and the design cost of the circuit is lowered. The AC zero-crossing detecting circuit comprises a front line terminal and a zero line terminal, which are respectively connected to the anode and cathode of an optical coupler, the collector electrode of the optical coupler is connected to high level via a pull-up resistor, the emitter of the optical coupler is earthed.
Description
Technical field
The utility model relates to a kind of zero cross detection circuit, specifically, relates to a kind of to exchanging the circuit that single-phase voltage carries out zero passage detection.
Background technology
In the power line carrier, PLC technical field, the zero passage detection of alternating current used in carrier wave device such as the power carrier adapter is required relatively stricter, to the requirement of the precision of zero passage detection and pulsewidth all than higher.In order to detect the zero crossing of alternating current, need to use composition combinational circuits such as comparer, amplifier to detect in the prior art, circuit structure is comparatively complicated, and cost is higher.
Summary of the invention
The utility model is at ac zero-crossing detection circuit complex structure, cost technical problems of high in the prior art, a kind of ac zero-crossing detection circuit is provided, adopt the monochromatic light coupling to form testing circuit, can realize detection easily according to the output of photoelectric coupled circuit to ac zero-crossing point, the reliability height, cost is lower.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of ac zero-crossing detection circuit comprises fire line terminal and zero terminal, and described fire line terminal is connected with negative pole with the positive pole of an optocoupler respectively with zero terminal; And the collector of described optocoupler connects high level by pull-up resistor, its grounded emitter.
Further, between the positive pole of described fire line terminal and described optocoupler, be in series with diode; The preferred breakdown reverse voltage of described diode is greater than the kenotron of 400V, thereby the optocoupler in the holding circuit is not reversed voltage breakdown.
Again further, between the positive pole of described fire line terminal and described optocoupler, also be in series with current-limiting resistance, play the effect of electric current in the restricting circuits, prevent the excessive damage optocoupler of electric current.
The invention also discloses a kind of power carrier adapter, include ac zero-crossing detection circuit in the described power carrier adapter, the fire line terminal in the described ac zero-crossing detection circuit is connected with negative pole with the positive pole of an optocoupler respectively with zero terminal; The collector of described optocoupler connects high level by pull-up resistor, the grounded emitter of described optocoupler.
Further, between the positive pole of described fire line terminal and described optocoupler, be in series with diode; The preferred breakdown reverse voltage of described diode is greater than the kenotron of 400V, thereby the optocoupler in the holding circuit is not reversed voltage breakdown.
Again further, between the positive pole of described fire line terminal and described optocoupler, also be in series with current-limiting resistance, play the effect of electric current in the restricting circuits, prevent the excessive damage optocoupler of electric current.
Compared with prior art, advantage of the present utility model and good effect are: adopt the monochromatic light coupling to form ac zero-crossing detection circuit, realize detection according to the output voltage waveforms of optocoupler to ac zero-crossing point, circuit structure is simple, higher to the reliability that zero crossing detects, simplify circuit, reduced circuit cost.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model ac zero-crossing detection circuit;
Fig. 2 is the waveform synoptic diagram that zero cross detection circuit shown in Figure 1 detects zero crossing.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
Figure 1 shows that the ac zero-crossing detection circuit in the power carrier adapter, among the figure, terminal L is for exchanging fire line terminal, and N is for exchanging zero terminal.Between L terminal and N terminal, be in series with photoelectric coupled circuit U1, wherein, the anodal pin 1 of optocoupler links to each other with the L terminal, and the negative pole pin 2 of optocoupler is connected with the N terminal, emitter pin 3 ground connection of optocoupler, and the collector pin 4 of optocoupler links to each other with the high level VCC of a 3.3V by pull-up resistor R2.In addition, between the positive pole 1 of fire line terminal L and U1, also be in series with kenotron D2 and current-limiting protection resistance R 1.
The concrete course of work of above-mentioned ac zero-crossing detection circuit is as follows: when alternating current is in positive half period, the voltage that is added in D2 and U1 two ends is forward voltage, commutation diode D2 and U1 conducting simultaneously, under the effect of pull-up resistor R2, the pin 4 of optocoupler U1 is output as low level.When alternating current during near the zero crossing of positive half period, because forward voltage is low excessively, commutation diode D2 and all not conductings of U1, under the effect of pull-up resistor R2, the pin 4 output high level of optocoupler U1.When alternating current was in negative half-cycle, D2 and U1 all bore negative voltage, all were in cut-off state, and because the breakdown reverse voltage of commutation diode D2 greater than 400V, can effectively protect optocoupler U1 can not punctured by negative voltage.Because D2 and all not conductings of U1, under the effect of pull-up resistor R2, the pin 4 of optocoupler U1 is still exported high level.And when alternating current was crossed the negative half-cycle zero crossing, forward voltage can raise gradually, thereby made D2 and U1 conducting again, and under the effect of pull-up resistor R2, the pin 4 of optocoupler U1 is output as low level.Referring to the waveform of Fig. 2 as can be known, when zero-crossing of alternating current, saltus step from the high level to the low level or from the low level to the high level can take place in the output voltage of the pin 4 of optocoupler U1, thereby, the rising edge or the negative edge pulse signal of the voltage waveform of the pin 4 by reading U1, can realize accurate detection, and utilize testing result that other devices are controlled zero-crossing of alternating current.
The voltage of pin 4 outputs of U1 when utilizing above-mentioned testing circuit to detect zero-crossing of alternating current, needs certain forward voltage during owing to commutation diode D2 and optocoupler U1 conducting, so can exist a spot of deviation when saltus step takes place.But because the stability of the alternating voltage between L terminal and the N terminal, this small deviation all is changeless in each ac cycle, can totally not have influence on subsequent cycle.Therefore, utilize above-mentioned testing circuit can detect the zero crossing of alternating current reliably, and simplified the circuit structure of complexity in the prior art greatly, thereby reduced the design cost of circuit.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection domain of the present utility model.
Claims (10)
1, a kind of ac zero-crossing detection circuit comprises fire line terminal and zero terminal, it is characterized in that, described fire line terminal is connected with negative pole with the positive pole of an optocoupler respectively with zero terminal; The collector of described optocoupler connects high level by pull-up resistor, the grounded emitter of described optocoupler.
2, ac zero-crossing detection circuit according to claim 1 is characterized in that, is in series with diode between the positive pole of described fire line terminal and described optocoupler.
3, ac zero-crossing detection circuit according to claim 2 is characterized in that, described diode is a kenotron.
4, ac zero-crossing detection circuit according to claim 3 is characterized in that, the breakdown reverse voltage of described kenotron is greater than 400V.
5, according to each described ac zero-crossing detection circuit in the claim 1 to 4, it is characterized in that, between the positive pole of described fire line terminal and described optocoupler, also be in series with current-limiting resistance.
6, a kind of power carrier adapter with the described ac zero-crossing detection circuit of claim 1 comprises fire line terminal and zero terminal, it is characterized in that, described fire line terminal is connected with negative pole with the positive pole of an optocoupler respectively with zero terminal; The collector of described optocoupler connects high level by pull-up resistor, the grounded emitter of described optocoupler.
7, power carrier adapter according to claim 6 is characterized in that, is in series with diode between the positive pole of described fire line terminal and described optocoupler.
8, power carrier adapter according to claim 7 is characterized in that, described diode is a kenotron.
9, power carrier adapter according to claim 8 is characterized in that, the breakdown reverse voltage of described kenotron is greater than 400V.
10, according to each described power carrier adapter in the claim 6 to 9, it is characterized in that, between the positive pole of described fire line terminal and described optocoupler, also be in series with current-limiting resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200231839U CN201203647Y (en) | 2008-05-29 | 2008-05-29 | AC zero-cross detection circuit and electric force carrier adapter with the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200231839U CN201203647Y (en) | 2008-05-29 | 2008-05-29 | AC zero-cross detection circuit and electric force carrier adapter with the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201203647Y true CN201203647Y (en) | 2009-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200231839U Expired - Lifetime CN201203647Y (en) | 2008-05-29 | 2008-05-29 | AC zero-cross detection circuit and electric force carrier adapter with the same |
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| CN (1) | CN201203647Y (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102385000A (en) * | 2010-08-27 | 2012-03-21 | 深圳长城开发科技股份有限公司 | Zero crossing detection circuit of electric meter system |
| CN102650656A (en) * | 2011-02-28 | 2012-08-29 | 浙江源创电子科技有限公司 | AC zero crossing signal collecting circuit |
| CN103033680A (en) * | 2011-09-30 | 2013-04-10 | 三星电机株式会社 | Power measuring system |
| CN103389401A (en) * | 2013-07-15 | 2013-11-13 | 汕头市超声仪器研究所有限公司 | Power grid voltage detection device |
| CN103944607A (en) * | 2014-04-14 | 2014-07-23 | 江苏益邦电力科技有限公司 | Low voltage power line carrier communication signal detection device |
| CN106124908A (en) * | 2016-08-30 | 2016-11-16 | 浙江图维科技股份有限公司 | A kind of Intelligent platform zone identifies device and method |
| CN106324326A (en) * | 2016-11-01 | 2017-01-11 | 广东京安交通科技有限公司 | Alternating voltage detection circuit and device |
| CN113676221A (en) * | 2021-08-23 | 2021-11-19 | 深圳市几度创想科技有限公司 | Decoding method of power line carrier |
-
2008
- 2008-05-29 CN CNU2008200231839U patent/CN201203647Y/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102385000A (en) * | 2010-08-27 | 2012-03-21 | 深圳长城开发科技股份有限公司 | Zero crossing detection circuit of electric meter system |
| CN102385000B (en) * | 2010-08-27 | 2015-07-01 | 深圳长城开发科技股份有限公司 | Zero crossing detection circuit of electric meter system |
| CN102650656A (en) * | 2011-02-28 | 2012-08-29 | 浙江源创电子科技有限公司 | AC zero crossing signal collecting circuit |
| CN103033680A (en) * | 2011-09-30 | 2013-04-10 | 三星电机株式会社 | Power measuring system |
| CN103389401A (en) * | 2013-07-15 | 2013-11-13 | 汕头市超声仪器研究所有限公司 | Power grid voltage detection device |
| CN103389401B (en) * | 2013-07-15 | 2015-11-25 | 汕头市超声仪器研究所有限公司 | A kind of electric network voltage detection device |
| CN103944607A (en) * | 2014-04-14 | 2014-07-23 | 江苏益邦电力科技有限公司 | Low voltage power line carrier communication signal detection device |
| CN106124908A (en) * | 2016-08-30 | 2016-11-16 | 浙江图维科技股份有限公司 | A kind of Intelligent platform zone identifies device and method |
| CN106324326A (en) * | 2016-11-01 | 2017-01-11 | 广东京安交通科技有限公司 | Alternating voltage detection circuit and device |
| CN113676221A (en) * | 2021-08-23 | 2021-11-19 | 深圳市几度创想科技有限公司 | Decoding method of power line carrier |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090304 |
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| CX01 | Expiry of patent term |