CN102385000B - Zero crossing detection circuit of electric meter system - Google Patents
Zero crossing detection circuit of electric meter system Download PDFInfo
- Publication number
- CN102385000B CN102385000B CN201010267502.2A CN201010267502A CN102385000B CN 102385000 B CN102385000 B CN 102385000B CN 201010267502 A CN201010267502 A CN 201010267502A CN 102385000 B CN102385000 B CN 102385000B
- Authority
- CN
- China
- Prior art keywords
- resistance
- input
- zero
- power supply
- voltage alternating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 61
- 239000003990 capacitor Substances 0.000 claims description 17
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims description 5
- 240000002853 Nelumbo nucifera Species 0.000 claims description 5
- 238000002955 isolation Methods 0.000 abstract description 7
- 239000000919 ceramic Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Abstract
The invention relates to a zero crossing detection circuit of an electric meter system, which comprises a zero crossing detection unit, a power supply unit and an isolation unit, wherein the zero crossing detection unit comprises an input end, an output end, a power supply end and a power supply ground, the input end is connected with a phase line of high-voltage alternating current, the ground is connected with a zero line of the high-voltage alternating current, the input of the power supply unit is connected between the phase line and the zero line of the high-voltage alternating current, the output of the power supply unit is connected with the power supply end and the power supply ground of the zero crossing detection unit, the isolation unit comprises an input side and an output side which are mutually isolated, the input side is connected in series between the power supply end and the output end of the zero crossing detection unit, the output side provides detection results, and the zero crossing point of the high-voltage alternating current can be precisely detected, and in addition, the high-voltage alternating current isolation can be realized.
Description
Technical field
The present invention relates to electric meter system, particularly relate to a kind of zero cross detection circuit in carrier power meter.
Background technology
Electric line carrier communication technology is widely used in automatic data logging field, and this communication modes often needs the zero crossing accurately detecting alternating current on line of electric force to realize normal communication.Mostly existing zero cross detection circuit is to obtain zero crossing by the mode of electric resistance partial pressure or stabilivolt, although this method easily realizes, cost is lower, poor in electrical isolation and antijamming capability etc.; Some testing circuits need power source special to power to it, and cost is high, complex structure, take more PCB surface and amass, and are difficult to use in the system of small volume.And, in carrier power meter, usually the light current interface that multiple human body can contact is provided with, and ammeter itself hangs on line of electric force, the components and parts of ammeter inside are probably with the High Level AC Voltage of harm personal safety, if effectively do not isolated, electric shock accidents can be caused than being easier to.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiency that above-mentioned prior art exists, and propose a kind of accurately can detect high-voltage alternating zero crossing and realize the zero cross detection circuit of high-voltage alternating isolation.
The present invention is directed to above-mentioned technical matters and the technical scheme proposed comprises, a kind of zero cross detection circuit of electric meter system is proposed, comprise: zero passage detection unit, it comprises input end, output terminal, power end and power supply ground, this input end is connected with the phase line of high-voltage alternating, and this power supply ground is connected with the zero line of high-voltage alternating, power supply unit, its input is connected between the phase line of high-voltage alternating and zero line, and it exports the power end and power supply ground that connect this zero passage detection unit, isolated location, comprises mutually isolated input side and outgoing side, and between the power end that this input side is serially connected in this zero passage detection unit and output terminal, this outgoing side provides testing result, this zero passage detection unit comprises detection resistance, input protection diode, two triodes of input resistance and mutual cascade, two triodes of this mutual cascade comprise first triode and second triode, this detection resistance is serially connected between the phase line of high-voltage alternating and this input resistance, this input resistance is serially connected between the input end of two triodes of this detection resistance and this mutual cascade, the positive pole of this input protection diode connects power supply ground, negative pole is connected with the link of input resistance with this detection resistance, this output terminal is connected with the output terminal of this second triode, between the output terminal that this power end is connected to this first triode and the input side of this isolated location, this power supply unit comprises power taking resistance, voltage stabilizing diode, commutation diode and storage capacitor, this power taking resistance, commutation diode and storage capacitor are in series arranged between the phase line of high-voltage alternating and zero line mutually, the positive pole of this commutation diode is connected with power taking resistance, the positive pole of this voltage stabilizing diode is connected with the zero line of high-voltage alternating, negative pole is connected with the positive pole of this commutation diode, and the output of this power supply unit is connected between the negative pole of this commutation diode and storage capacitor, wherein, time the voltage in the phase line of high-voltage alternating is in positive half cycle, this input side maintains cut-off state, voltage in the phase line of high-voltage alternating is from positive half cycle toward negative half period when ground zero passage, and this input side changes conducting state into by cut-off state, time voltage in the phase line of high-voltage alternating is in negative half period, this input side maintains conducting state, time voltage in the phase line of high-voltage alternating is from negative half period toward positive half cycle ground zero passage, this input side changes cut-off state into by conducting state.
This first triode is NPN type, and its base stage is connected with this input resistance, and its collector is connected via the power end of a resistance with this zero passage detection unit, is connected its emitter and power supply; This second triode is NPN type, and its base stage is connected with the collector of this first triode, and its collector is connected with the input side of this isolated location, is connected its emitter and power supply.
This detection resistance comprises the resistance of multiple series connection.
This zero passage detection unit also comprises the electric capacity with this input protection diodes in parallel.
This storage capacitor comprises an electric capacity or parallel with one another at least two electric capacity.Described electric capacity can be the electrochemical capacitor having polarity, also can be non-polar ceramic condenser.
This power taking resistance comprises the resistance of multiple series connection.
This isolated location comprises light lotus root device, it comprises and is positioned at the light emitting diode of input side and the phototriode of outgoing side, this phototriode connects direct supply, the emitter of this phototriode connects the earth terminal of this direct supply, collector connects the power end of this direct supply via resistance, and this collector directly can provide the output of testing result, or, this collector can connect negative circuit, is provided the output of testing result by this negative circuit.
Compared with prior art, the zero cross detection circuit of electric meter system of the present invention, accurately can detect the zero crossing of high-voltage alternating and realize high-voltage alternating isolation.
Accompanying drawing explanation
Fig. 1 is the electrical schematic diagram of the zero cross detection circuit embodiment of electric meter system of the present invention.
Fig. 2 is input and the first output waveform figure of the zero cross detection circuit embodiment of electric meter system of the present invention.
Fig. 3 is input and the second output waveform figure of the zero cross detection circuit embodiment of electric meter system of the present invention.
Embodiment
Below in conjunction with accompanying drawing, elaboration is further given to the present invention.
Fig. 1 is the electrical schematic diagram of the zero cross detection circuit embodiment of electric meter system of the present invention.This zero cross detection circuit comprises: zero passage detection unit, power supply unit and isolated location.
This power supply unit comprises power taking resistance R1, R2 and R3, voltage stabilizing diode Z1, commutation diode D1 and storage capacitor C1 and C2, this power taking resistance R1, R2 and R3, commutation diode Z1 and storage capacitor C1 and C2 are in series arranged between the phase line L-Line of high-voltage alternating and zero line N-Line mutually, the positive pole of this commutation diode D1 is connected with R3 with power taking resistance R1, R2, and the positive pole of this voltage stabilizing diode Z1 is connected with the zero line N-Line of high-voltage alternating, negative pole is connected with the positive pole of this commutation diode D1.Visible, this power taking resistance comprises resistance R1, R2 and R3 of three series connection, this structure improves the resistance to pressure of circuit, thus improve the reliability of whole circuit, this storage capacitor comprises two electric capacity C1 and C2 parallel with one another, and each electric capacity can be the electrochemical capacitor having polarity, also can be non-polar ceramic condenser, this structure can improve power reservoir capacity on the one hand, can improve the reliability of whole circuit on the other hand.In a side circuit, power taking resistance R1, R2 and R3 all select 68K ohm, voltage stabilizing diode Z1 selects the pipe of 10V, commutation diode D1 selects IN4148, storage capacitor C1 and C2 all selects 10 μ F, it should be noted that, storage capacitor only adopts a capacitance to be that electrochemical capacitor/ceramic condenser C1 or C2 of 10 μ F realizes also being fine.
This zero passage detection unit comprises detection resistance R6, R7 and R8, input protection diode D2, input resistance R9, two triode Q1 of electric capacity C3 and mutual cascade, Q2, this detection resistance R6, R7 and R8 is serially connected between the phase line L-Line of high-voltage alternating and this input resistance R9, this input resistance R9 is serially connected in this detection resistance R6, two triode Q1 of R7 and R8 and this mutual cascade, between the input end of Q2, the positive pole of this input protection diode D2 connects power supply ground, negative pole and this detection resistance R6, R7 with R8 is connected with the link of input resistance R9, electric capacity C3 is in parallel with this input protection diode D2.Two triodes of this mutual cascade comprise first triode Q1 and second triode Q2; This first triode Q1 is NPN type, and its base stage is connected with this input resistance R9, and its collector is connected with the power end of this zero passage detection unit via a resistance R4, is connected its emitter and power supply; This second triode Q2 is NPN type, and its base stage is connected with the collector of this first triode Q1, and its collector is connected with the input side of this isolated location, is connected its emitter and power supply.In a side circuit, detect resistance R6, R7 and R8 and all select 150K ohm, input protection diode D2 selects BAT54S, and input resistance R9 selects 510 ohm, and electric capacity C3 all selects 10Nf, and two triodes Q1, Q2 all select BC847.
This isolated location comprises light lotus root device U1, it comprises and is positioned at the light emitting diode of input side and the phototriode of outgoing side, the positive pole of this light emitting diode is connected with the positive pole of storage capacitor C1 with C2 in this power supply unit by resistance R5, and the negative pole of this light emitting diode is connected with the collector of second triode Q2 in this zero passage detection unit; This phototriode connects direct supply, the emitter of this phototriode connects the earth terminal of this direct supply, collector connects the power end 3V3 of this direct supply via resistance R10, this collector directly can provide the output TP1 of testing result, at this moment zero cross detection circuit is equivalent to remove resistance R11 and NPN type triode Q3 in FIG, at this moment input, output waveform are as shown in Figure 3, wherein, be input as sine wave, export as square wave, and, this square wave and this sinusoidal wave homophase, namely: when input is in positive half cycle, export and be in high level; When input is in negative half period, exports and be also in low level; When the sinusoidal wave zero passage of input, the square wave reversion of output.In a side circuit, this light lotus root device U1 selects 2501, and resistance R5 selects 1K ohm, and resistance R10 selects 10K ohm.
Or, as shown in Figure 1, this collector can connect the negative circuit be made up of resistance R11 and NPN type triode Q3 to zero cross detection circuit, and this negative circuit provides the output TP2 of testing result, at this moment input, output waveform are as shown in Figure 2, wherein, be input as sine wave, export as square wave, and, this square wave and this sine wave anti-phase, namely: input be in positive half cycle in, export be in low level; When input is in negative half period, exports and be also in high level; When the sinusoidal wave zero passage of input, the square wave reversion of output.In a side circuit, resistance R11 selects 10K ohm, and resistance R10 selects 10K ohm, and NPN type triode Q3 selects BC847.
Compared with prior art, the zero cross detection circuit of electric meter system of the present invention, the beneficial effect had comprises:
1. can realize the zero crossing accurately detecting line of electric force alternating current;
2. realize the isolation of high-voltage power line and weak electricity measuring system, effectively avoiding getting an electric shock occurs, and guarantees personal safety;
3., without the need to increasing power source special in high-pressure side, this circuit can self-powered;
4. antijamming capability is strong;
5. circuit is simple, and cost is lower;
6. affect little by factors such as environment temperatures, working stability, reliable.
Foregoing; be only preferred embodiment of the present invention; not for limiting embodiment of the present invention; those of ordinary skill in the art are according to central scope of the present invention and spirit; can carry out corresponding flexible or amendment very easily, therefore protection scope of the present invention should be as the criterion with the protection domain required by claims.
Claims (8)
1. a zero cross detection circuit for electric meter system, is characterized in that, comprising: zero passage detection unit, and it comprises input end, output terminal, power end and power supply ground, and this input end is connected with the phase line of high-voltage alternating, and this power supply ground is connected with the zero line of high-voltage alternating, power supply unit, its input is connected between the phase line of high-voltage alternating and zero line, and it exports the power end and power supply ground that connect this zero passage detection unit, isolated location, comprises mutually isolated input side and outgoing side, and between the power end that this input side is serially connected in this zero passage detection unit and output terminal, this outgoing side provides testing result, this zero passage detection unit comprises detection resistance, input protection diode, two triodes of input resistance and mutual cascade, two triodes of this mutual cascade comprise first triode and second triode, this detection resistance is serially connected between the phase line of high-voltage alternating and this input resistance, this input resistance is serially connected between the input end of two triodes of this detection resistance and this mutual cascade, the positive pole of this input protection diode connects power supply ground, negative pole is connected with the link of input resistance with this detection resistance, the output terminal of this zero passage detection unit is connected with the output terminal of this second triode, between the output terminal that the power end of this zero passage detection unit is connected to this first triode and the input side of this isolated location, this power supply unit comprises power taking resistance, voltage stabilizing diode, commutation diode and storage capacitor, this power taking resistance, commutation diode and storage capacitor are in series arranged between the phase line of high-voltage alternating and zero line mutually, the positive pole of this commutation diode is connected with power taking resistance, the positive pole of this voltage stabilizing diode is connected with the zero line of high-voltage alternating, negative pole is connected with the positive pole of this commutation diode, and the output of this power supply unit is connected between the negative pole of this commutation diode and storage capacitor, wherein, time the voltage in the phase line of high-voltage alternating is in positive half cycle, this input side maintains cut-off state, voltage in the phase line of high-voltage alternating is from positive half cycle toward negative half period when ground zero passage, and this input side changes conducting state into by cut-off state, time voltage in the phase line of high-voltage alternating is in negative half period, this input side maintains conducting state, time voltage in the phase line of high-voltage alternating is from negative half period toward positive half cycle ground zero passage, this input side changes cut-off state into by conducting state.
2. zero cross detection circuit as claimed in claim 1, it is characterized in that, this first triode is NPN type, and its base stage is connected with this input resistance, and its collector is connected via the power end of a resistance with this zero passage detection unit, is connected its emitter and power supply; This second triode is NPN type, and its base stage is connected with the collector of this first triode, and its collector is connected with the input side of this isolated location, is connected its emitter and power supply.
3. zero cross detection circuit as claimed in claim 1, it is characterized in that, this detection resistance comprises the resistance of multiple series connection.
4. zero cross detection circuit as claimed in claim 1, it is characterized in that, this zero passage detection unit also comprises the electric capacity with this input protection diodes in parallel.
5. zero cross detection circuit as claimed in claim 1, it is characterized in that, this storage capacitor comprises an electric capacity or parallel with one another at least two electric capacity.
6. zero cross detection circuit as claimed in claim 1, it is characterized in that, this power taking resistance comprises the resistance of multiple series connection.
7. the zero cross detection circuit as described in as arbitrary in claim 1 to 6, it is characterized in that, this isolated location comprises light lotus root device, it comprises and is positioned at the light emitting diode of input side and the phototriode of outgoing side, this phototriode connects direct supply, the emitter of this phototriode connects the earth terminal of this direct supply, and collector connects the power end of this direct supply via resistance, and this collector directly provides the output of testing result.
8. the zero cross detection circuit as described in as arbitrary in claim 1 to 6, it is characterized in that, this isolated location comprises light lotus root device, it comprises and is positioned at the light emitting diode of input side and the phototriode of outgoing side, this phototriode connects direct supply, and the emitter of this phototriode connects the earth terminal of this direct supply, and collector connects the power end of this direct supply via a resistance, this collector also connects negative circuit, and this negative circuit provides the output of testing result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010267502.2A CN102385000B (en) | 2010-08-27 | 2010-08-27 | Zero crossing detection circuit of electric meter system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010267502.2A CN102385000B (en) | 2010-08-27 | 2010-08-27 | Zero crossing detection circuit of electric meter system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102385000A CN102385000A (en) | 2012-03-21 |
| CN102385000B true CN102385000B (en) | 2015-07-01 |
Family
ID=45824622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010267502.2A Active CN102385000B (en) | 2010-08-27 | 2010-08-27 | Zero crossing detection circuit of electric meter system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102385000B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4194859A1 (en) * | 2021-12-08 | 2023-06-14 | Hangzhou Lianxintong Semiconductor Co., Ltd. | Zero-crossing detection circuit |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887998A (en) * | 2012-12-20 | 2014-06-25 | 深圳市力生美半导体器件有限公司 | Switch power source and switch power source integration circuit |
| CN106501587A (en) * | 2016-11-04 | 2017-03-15 | 青岛新芯智能电子科技有限公司 | Isolated accurate zero cross detection circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04109817A (en) * | 1990-08-27 | 1992-04-10 | Mitsubishi Electric Corp | Instantaneous power interruption and instantaneous voltage drop detecting circuit |
| CN201063054Y (en) * | 2007-06-27 | 2008-05-21 | 临安科星电子有限公司 | Isolated circuit for detecting power supply phase |
| CN201203647Y (en) * | 2008-05-29 | 2009-03-04 | 青岛海信宽带多媒体技术股份有限公司 | AC zero-cross detection circuit and electric force carrier adapter with the same |
| CN201514441U (en) * | 2009-08-06 | 2010-06-23 | 广东科能通用电气有限公司 | Current zero-crossing detection current circuit |
-
2010
- 2010-08-27 CN CN201010267502.2A patent/CN102385000B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04109817A (en) * | 1990-08-27 | 1992-04-10 | Mitsubishi Electric Corp | Instantaneous power interruption and instantaneous voltage drop detecting circuit |
| CN201063054Y (en) * | 2007-06-27 | 2008-05-21 | 临安科星电子有限公司 | Isolated circuit for detecting power supply phase |
| CN201203647Y (en) * | 2008-05-29 | 2009-03-04 | 青岛海信宽带多媒体技术股份有限公司 | AC zero-cross detection circuit and electric force carrier adapter with the same |
| CN201514441U (en) * | 2009-08-06 | 2010-06-23 | 广东科能通用电气有限公司 | Current zero-crossing detection current circuit |
Non-Patent Citations (1)
| Title |
|---|
| 三相电源过零信号检测及相序自适应的研究与实现;张财志 等;《国外电子元器件》;20080930;第16卷(第9期);第57-61页 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4194859A1 (en) * | 2021-12-08 | 2023-06-14 | Hangzhou Lianxintong Semiconductor Co., Ltd. | Zero-crossing detection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102385000A (en) | 2012-03-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103424606B (en) | A kind of low voltage electric power carrier communication zero cross detection circuit of frequency self-adaption | |
| CN103063979A (en) | Load open-circuit detection circuit | |
| CN201203647Y (en) | AC zero-cross detection circuit and electric force carrier adapter with the same | |
| CN102385000B (en) | Zero crossing detection circuit of electric meter system | |
| CN103390878A (en) | Lamp power output overvoltage protection circuit and lamp | |
| CN104111397A (en) | Power interruption detection circuit and lamp | |
| CN201765270U (en) | Zero-crossing detection circuit of electric meter system | |
| CN202548267U (en) | Circuit for detecting live wire and zero wire | |
| CN202929127U (en) | Circuit for detecting three-phase electricity phase sequence and open phase | |
| CN203551744U (en) | Electric energy meter load switch state detection circuit | |
| CN204794018U (en) | Microcomputer protection, measurement, and control device | |
| CN206481041U (en) | A kind of communication truck residual current protection detects circuit structure | |
| CN204559106U (en) | A kind of convertible frequency air-conditioner and electrolytic capacitor overvoltage crowbar thereof | |
| CN103116075B (en) | Intelligent phase-checking device for P-type power distribution station | |
| CN104181370A (en) | Load current detection circuit and detection device | |
| CN203745548U (en) | Railway signal detection circuit and railway signal detector | |
| CN203130575U (en) | Alternating-current fan fault detecting circuit | |
| CN102081147A (en) | Testing pen capable of displaying direct current and alternating current | |
| CN207832988U (en) | A kind of Three phase power phase shortage reverse phase detection circuit | |
| CN207007980U (en) | A kind of AC dump detects circuit | |
| CN202948081U (en) | Electronic detection device for building fire-fighting equipments | |
| CN207832987U (en) | A kind of open phases of three-phase power source reverse phase detection circuit | |
| CN205049720U (en) | General type detection circuitry of alternating current -direct current lamps and lanterns | |
| CN104280091A (en) | Water level detection circuit | |
| CN105116200A (en) | Detection circuit compatible with switching value and level amount |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210414 Address after: 611731 no.1218, Hezuo Road, high tech Zone (West District), Chengdu, Sichuan Province Patentee after: CHENGDU GREAT WALL DEVELOPMENT TECHNOLOGY Co.,Ltd. Address before: Futian District Shenzhen City, Guangdong province 518000 CaiTian Road No. 7006 Patentee before: SHENZHEN KAIFA TECHNOLOGY Co.,Ltd. |
|
| CP03 | Change of name, title or address |
Address after: 611731 No. 99, Tianquan Road, high tech Zone, Chengdu, Sichuan Patentee after: Chengdu Great Wall Development Technology Co.,Ltd. Address before: 611731 no.1218, Hezuo Road, high tech Zone (West District), Chengdu, Sichuan Province Patentee before: CHENGDU GREAT WALL DEVELOPMENT TECHNOLOGY Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220824 Address after: Futian District Shenzhen City, Guangdong province 518000 CaiTian Road No. 7006 Patentee after: SHENZHEN KAIFA TECHNOLOGY Co.,Ltd. Address before: 611731 No. 99, Tianquan Road, high tech Zone, Chengdu, Sichuan Patentee before: Chengdu Great Wall Development Technology Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221215 Address after: 611731 No. 99, Tianquan Road, high tech Zone, Chengdu, Sichuan Patentee after: Chengdu Great Wall Development Technology Co.,Ltd. Address before: Futian District Shenzhen City, Guangdong province 518000 CaiTian Road No. 7006 Patentee before: SHENZHEN KAIFA TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right |