CN102385000A - Zero crossing detection circuit of electric meter system - Google Patents
Zero crossing detection circuit of electric meter system Download PDFInfo
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- CN102385000A CN102385000A CN2010102675022A CN201010267502A CN102385000A CN 102385000 A CN102385000 A CN 102385000A CN 2010102675022 A CN2010102675022 A CN 2010102675022A CN 201010267502 A CN201010267502 A CN 201010267502A CN 102385000 A CN102385000 A CN 102385000A
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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 the ammeter system, relate in particular to a kind of zero cross detection circuit in carrier power meter.
Background technology
The electric line carrier communication technology is widely used in the automatic data logging field, and the zero crossing that this communication modes often needs accurately to detect alternating current on the line of electric force is to realize normal communication.Mostly existing zero cross detection circuit is to obtain zero crossing with the mode of electric resistance partial pressure or stabilivolt, though this method realizes easily, cost is lower, relatively poor at aspects such as electrical isolation and antijamming capabilities; The testing circuit that has needs power source special to supply power to it, cost height, complex structure, takies more PCB area, is difficult in the less system of volume, use.And; In carrier power meter; Usually be provided with the light current interface that multiple human body can contact, and ammeter itself hangs on the line of electric force, the inner components and parts of ammeter have the High Level AC Voltage that endangers personal safety probably; If do not carry out effective isolation, can be than being easier to cause electric shock accidents.
Summary of the invention
The technical matters that the present invention will solve is to overcome the deficiency that above-mentioned prior art exists, and proposes a kind of zero cross detection circuit that can accurately detect the zero crossing of high-voltage alternating and realize the high-voltage alternating isolation.
The technical scheme that the present invention is directed to above-mentioned technical matters and propose comprises; The zero cross detection circuit of a kind of ammeter system is proposed; Comprise: the zero passage detection unit; It comprises input end, output terminal, power end and power supply ground, and this input end links to each other with the phase line of high-voltage alternating, and this ground links to each other with the zero line of high-voltage alternating; Power supply unit, its input are connected between the phase line and zero line of high-voltage alternating, and its output connects the power end and the power supply ground of this zero passage detection unit; Isolated location comprises the input side and the outgoing side of mutual isolation, and this input side is serially connected between the power end and output terminal of this zero passage detection unit; This outgoing side provides testing result; Wherein, when the voltage on the phase line of high-voltage alternating was in positive half cycle, this input side maintained cut-off state; By positive half cycle toward negative half period ground zero passage the time, this input side changes conducting state into by cut-off state when the voltage on the phase line of high-voltage alternating; When the voltage on the phase line of high-voltage alternating was in negative half period, this input side maintained conducting state; When the voltage on the phase line of high-voltage alternating by negative half period toward positive half cycle ground zero passage the time, this input side changes cut-off state into by conducting state.
This zero passage detection unit comprises two triodes that detect resistance, input protection diode, input resistance and mutual cascade; This detection resistance string is connected between the phase line and this input resistance of high-voltage alternating; This input resistance is serially connected between the input end of two triodes of this detection resistance and this mutual cascade, and the positive pole of this input protection diode connects power supply ground, negative pole links to each other with the link of input resistance with this detection resistance.
Two triodes of this mutual cascade comprise first triode and second triode; This first triode is the NPN type, and its base stage links to each other with this input resistance, and its collector links to each other with this power end via a resistance, and its emitter links to each other with power supply ground; This second triode is the NPN type, and the collector of its first triode of base stage and this links to each other, and its collector links to each other with the input side of this isolated location, and its emitter links to each other with power supply ground.
This detection resistance comprises the resistance of a plurality of series connection.
This zero passage detection unit also comprises the electric capacity parallelly connected with this input protection diode.
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 in series are arranged between the phase line and zero line of high-voltage alternating each other; The positive pole of this commutation diode links to each other with power taking resistance, and the positive pole of this voltage stabilizing diode links to each other with the zero line of high-voltage alternating, negative pole links to each other with the positive pole of this commutation diode.
This storage capacitor comprises an electric capacity or at least two electric capacity parallel with one another.Described electric capacity can be the electrochemical capacitor that polarity is arranged, and also can be non-polar ceramic condenser.
This power taking resistance comprises the resistance of a plurality of series connection.
This isolated location comprises light lotus root device, and it comprises the light emitting diode that is positioned at input side and the phototriode of outgoing side, and this phototriode connects direct supply; The emitter of this phototriode connects the earth terminal of this direct supply; Collector is via the power end of this direct supply of resistance connection, and this collector can directly provide the output of testing result, perhaps; This collector can connect negative circuit, and the output of testing result is provided by this negative circuit.
Compared with prior art, the zero cross detection circuit of ammeter of the present invention system can accurately detect the zero crossing of high-voltage alternating and realize that high-voltage alternating isolates.
Description of drawings
Fig. 1 is the electrical schematic diagram of the zero cross detection circuit embodiment of ammeter of the present invention system.
Fig. 2 is input and first kind of output waveform figure of the zero cross detection circuit embodiment of ammeter of the present invention system.
Fig. 3 is input and second kind of output waveform figure of the zero cross detection circuit embodiment of ammeter of the present invention system.
Embodiment
Below in conjunction with accompanying drawing, the present invention is given elaboration further.
Fig. 1 is the electrical schematic diagram of the zero cross detection circuit embodiment of ammeter of the present invention system.This zero cross detection circuit comprises: zero passage detection unit, power supply unit and isolated location.
This power supply unit comprises power taking resistance R 1, R2 and R3, voltage stabilizing diode Z1, commutation diode D1 and storage capacitor C1 and C2; This power taking resistance R 1, R2 and R3, commutation diode Z1 and storage capacitor C1 and C2 in series are arranged between the phase line L-Line and zero line N-Line of high-voltage alternating each other; The positive pole of this commutation diode D1 links to each other with power taking resistance R 1, R2 and R3, and the positive pole of this voltage stabilizing diode Z1 links to each other with the zero line N-Line of high-voltage alternating, negative pole links to each other with the positive pole of this commutation diode D1.It is thus clear that this power taking resistance comprises resistance R 1, R2 and the R3 of three series connection, this structure improves the resistance to pressure of circuit; Thereby improve the reliability of entire circuit; This storage capacitor comprises two capacitor C 1 parallel with one another and C2, and each electric capacity can be the electrochemical capacitor that polarity is arranged, and also can be non-polar ceramic condenser; This structure can improve the electric power storage ability on the one hand, can improve the reliability of entire circuit on the other hand.In a side circuit; Power taking resistance R 1, R2 and R3 all select 68K ohm for use; Voltage stabilizing diode Z1 selects the pipe of 10V for use, and commutation diode D1 selects IN4148 for use, and storage capacitor C1 and C2 all select 10 μ F for use; Need to prove that it is that electrochemical capacitor/ceramic condenser C1 or the C2 of 10 μ F realizes also being fine that storage capacitor only adopts an appearance value.
This zero passage detection unit comprises two triode Q1, the Q2 that detects resistance R 6, R7 and R8, input protection diode D2, input resistance R9, capacitor C 3 and cascade each other; This detection resistance R 6, R7 and R8 are serially connected between the phase line L-Line and this input resistance R9 of high-voltage alternating; This input resistance R9 is serially connected between the input end of two triode Q1, Q2 of this detection resistance R 6, R7 and R8 and this mutual cascade; The positive pole of this input protection diode D2 connects power supply ground, negative pole links to each other with the link of input resistance R9 with this detection resistance R 6, R7 and R8, and capacitor C 3 is parallelly connected 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 the NPN type, and its base stage links to each other with this input resistance R9, and its collector links to each other with this power end via a resistance R 4, and its emitter links to each other with power supply ground; This second triode Q2 is the NPN type, and the collector of first triode of its base stage and this Q1 links to each other, and its collector links to each other with the input side of this isolated location, and its emitter links to each other with power supply ground.In a side circuit, detect resistance R 6, R7 and R8 and all select 150K ohm for use, input protection diode D2 selects BAT54S for use, and input resistance R9 selects 510 ohm for use, and capacitor C 3 is all selected 10Nf for use, and two triode Q1, Q2 all select BC847 for use.
This isolated location comprises light lotus root device U1; It comprises the light emitting diode that is positioned at input side and the phototriode of outgoing side; The positive pole of this light emitting diode links to each other through storage capacitor C1 in resistance R 5 and this power supply unit and the positive pole of C2, and the collector of second triode Q2 in the negative pole of this light emitting diode and this zero passage detection unit links to each other; 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 3V3 of this direct supply via resistance R 10; This collector can directly provide the output TP1 of testing result, and zero cross detection circuit at this moment is equivalent in Fig. 1, remove resistance R 11 and NPN type triode Q3, and at this moment input, output waveform are as shown in Figure 3; Wherein, be input as sine wave, be output as square wave; And; This square wave and this sine wave homophase, just: when input was in positive half cycle, output was in high level; When input was in negative half period, output also was in low level; In the sinusoidal wave zero passage of input, the counter-rotating of the square wave of output.In a side circuit, this light lotus root device U1 selects 2501 for use, and resistance R 5 is selected 1K ohm for use, and resistance R 10 is selected 10K ohm for use.
Perhaps, zero cross detection circuit is as shown in Figure 1, and this collector can connect the negative circuit that is made up of resistance R 11 and NPN type triode Q3; This negative circuit provides the output TP2 of testing result, and at this moment input, output waveform are as shown in Figure 2, wherein; Be input as sine wave, be output as square wave, and; This square wave and this sine wave anti-phase, just: when input was in positive half cycle, output was in low level; When input was in negative half period, output also was in high level; In the sinusoidal wave zero passage of input, the counter-rotating of the square wave of output.In a side circuit, resistance R 11 is selected 10K ohm for use, and resistance R 10 is selected 10K ohm for use, and NPN type triode Q3 selects BC847 for use.
Compared with prior art, the zero cross detection circuit of ammeter of the present invention system, the beneficial effect that has comprises:
1. can realize accurately detecting the zero crossing of line of electric force alternating current;
2. realize the isolation of high-voltage power line and weak electricity measuring system, effectively avoid getting an electric shock and take place, guarantee personal safety;
3. need not increases power source special in the high-pressure side, and this circuit can be supplied power voluntarily;
4. antijamming capability is strong;
5. circuit is simple, and cost is lower;
6. receive factor affecting such as environment temperature little, working stability, reliable.
Foregoing; Be merely preferred embodiment of the present invention; Be not to be used to limit embodiment of the present invention; Those of ordinary skills can carry out corresponding flexible or modification, so protection scope of the present invention should be as the criterion with the desired protection domain of claims very easily according to main design of the present invention and spirit.
Claims (10)
1. the zero cross detection circuit of an ammeter system is characterized in that, comprising: the zero passage detection unit, and it comprises input end, output terminal, power end and power supply ground, and this input end links to each other with the phase line of high-voltage alternating, and this ground links to each other with the zero line of high-voltage alternating; Power supply unit, its input are connected between the phase line and zero line of high-voltage alternating, and its output connects the power end and the power supply ground of this zero passage detection unit; Isolated location comprises the input side and the outgoing side of mutual isolation, and this input side is serially connected between the power end and output terminal of this zero passage detection unit; This outgoing side provides testing result; Wherein, when the voltage on the phase line of high-voltage alternating was in positive half cycle, this input side maintained cut-off state; By positive half cycle toward negative half period ground zero passage the time, this input side changes conducting state into by cut-off state when the voltage on the phase line of high-voltage alternating; When the voltage on the phase line of high-voltage alternating was in negative half period, this input side maintained conducting state; When the voltage on the phase line of high-voltage alternating by negative half period toward positive half cycle ground zero passage the time, 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 zero passage detection unit comprises two triodes that detect resistance, input protection diode, input resistance and mutual cascade; This detection resistance string is connected between the phase line and this input resistance of high-voltage alternating; This input resistance is serially connected between the input end of two triodes of this detection resistance and this mutual cascade, and the positive pole of this input protection diode connects power supply ground, negative pole links to each other with the link of input resistance with this detection resistance.
3. zero cross detection circuit as claimed in claim 2 is characterized in that, two triodes of this mutual cascade comprise first triode and second triode; This first triode is the NPN type, and its base stage links to each other with this input resistance, and its collector links to each other with this power end via a resistance, and its emitter links to each other with power supply ground; This second triode is the NPN type, and the collector of its first triode of base stage and this links to each other, and its collector links to each other with the input side of this isolated location, and its emitter links to each other with power supply ground.
4. zero cross detection circuit as claimed in claim 2 is characterized in that this detection resistance comprises the resistance of a plurality of series connection.
5. zero cross detection circuit as claimed in claim 2 is characterized in that, this zero passage detection unit also comprises the electric capacity parallelly connected with this input protection diode.
6. zero cross detection circuit as claimed in claim 1; It is characterized in that; 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 in series are arranged between the phase line and zero line of high-voltage alternating each other, and the positive pole of this commutation diode links to each other with power taking resistance, and the positive pole of this voltage stabilizing diode links to each other with the zero line of high-voltage alternating, negative pole links to each other with the positive pole of this commutation diode.
7. zero cross detection circuit as claimed in claim 6 is characterized in that, this storage capacitor comprises an electric capacity or at least two electric capacity parallel with one another.
8. zero cross detection circuit as claimed in claim 6 is characterized in that this power taking resistance comprises the resistance of a plurality of series connection.
9. like the arbitrary described zero cross detection circuit of claim 1 to 8; It is characterized in that this isolated location comprises light lotus root device, it comprises the light emitting diode that is positioned at 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 is via the power end of this direct supply of resistance connection, and this collector directly provides the output of testing result.
10. like the arbitrary described zero cross detection circuit of claim 1 to 8, it is characterized in that this isolated location comprises light lotus root device; It comprises the light emitting diode that is positioned at 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 |
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| CN102385000A true CN102385000A (en) | 2012-03-21 |
| CN102385000B CN102385000B (en) | 2015-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010267502.2A Active CN102385000B (en) | 2010-08-27 | 2010-08-27 | Zero crossing detection circuit of electric meter system |
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Cited By (3)
| 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 |
| EP4194859A1 (en) * | 2021-12-08 | 2023-06-14 | Hangzhou Lianxintong Semiconductor Co., Ltd. | Zero-crossing detection circuit |
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| 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)
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| 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 |
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Non-Patent Citations (1)
| Title |
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| 张财志 等: "三相电源过零信号检测及相序自适应的研究与实现", 《国外电子元器件》 * |
Cited By (3)
| 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 |
| EP4194859A1 (en) * | 2021-12-08 | 2023-06-14 | Hangzhou Lianxintong Semiconductor Co., Ltd. | Zero-crossing detection circuit |
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| CN102385000B (en) | 2015-07-01 |
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