CN105675968A - High-precision three-phase AC signal positive-negative zero-crossing detecting device and method - Google Patents
High-precision three-phase AC signal positive-negative zero-crossing detecting device and method Download PDFInfo
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Abstract
The invention discloses a high-precision three-phase AC signal positive-negative zero-crossing detecting device which comprises a positive and negative zero-crossing detection circuit. The positive and negative zero-crossing detection circuit comprises a first optical coupler, a second optical coupler, a first NOT gate, a second NOT gate and a NOR gate; an LED in the first optical coupler is in anti-phase parallel connection with an LED in the second optical coupler; the collector electrode of a photosensitive triode in the first optical coupler is connected with the first NOR gate in series and then to a first input port of a signal processing unit; the collector electrode of a photosensitive triode in the second optical coupler is connected with the second NOR gate in series and then to a third input port of the signal processing unit; the input end of the NOR gate is connected with the output of the first NOT gate and the output end of the second NOT gate; and the input end of the NOR gate is also connected with the second input end of the signal processing unit. The invention also discloses a high-precision three-phase AC signal positive-negative zero-crossing detecting method. The signal processing unit determines positive and negative zero-crossing points according to signals output by the positive and negative zero-crossing detection circuit. According to the device and method, the structure is simple, and the anti-interference capability is high.
Description
Technical field
The present invention relates to a kind of high accuracy positive and negative zero crossing detection device of three-phase ac signal, further relate to a kind of high accuracy positive and negative zero passage detection method of three-phase ac signal, belong to signal detection technique field.
Background technology
Existing AC signal zero crossing detection circuit is of a great variety, wherein utilizes the circuit that optocoupler carries out zero passage detection to be widely used.
Existing optocoupler detecting device is to constitute with two optocouplers, and its detection method is to utilize AC signal characteristic of optocoupler cut-off when close to zero crossing to realize the detection of zero crossing. Owing to the cut-off of optocoupler is not the zero crossing of strict corresponding AC signal, therefore there is the problems such as dead band, zero passage inaccuracy, error are big.
Summary of the invention
It is an object of the invention to overcome deficiency of the prior art, a kind of high accuracy positive and negative zero crossing detection device of three-phase ac signal is provided, solve optocoupler zero passage detection in prior art and there is dead band, zero passage inaccuracy, technical problem that error is big, and the positive and negative zero crossing of three-phase ac signal can be detected.
For solving above-mentioned technical problem, the technical scheme that the positive and negative zero crossing detection device of high accuracy three-phase ac signal provided by the invention adopts is:
Including signal processing unit, three groups of positive and negative zero cross detection circuits being connected between three-phase alternating current to be detected and signal processing unit, three groups of positive and negative zero passage detection ends are drawn in wantonly two combinations in three-phase alternating current to be detected, and each group of positive and negative zero passage detection end connects one group of positive and negative zero cross detection circuit;
Described positive and negative zero cross detection circuit includes: the first optocoupler, the second optocoupler, the first not gate, the second not gate and nor gate; After the light emitting diode of the first optocoupler and the light emitting diode reverse parallel connection of the second optocoupler, it is connected between corresponding positive and negative zero passage detection end; The colelctor electrode of the phototriode of the first optocoupler connect first non-behind the door, be connected with the first input port of signal processing unit, the grounded emitter of the phototriode of the first optocoupler; The colelctor electrode of the phototriode of the second optocoupler connect second non-behind the door, be connected with the 3rd input port of signal processing unit, the grounded emitter of the phototriode of the second optocoupler; Two inputs of described nor gate are connected with the outfan of the outfan of the first not gate, the second not gate respectively, and the outfan of nor gate is connected with the second input port of signal processing unit;
The colelctor electrode of the phototriode of the first optocoupler, the second optocoupler the colelctor electrode of phototriode also electrically connect with power supply VCC respectively;
The level signal that described signal processing unit exports according to the first input port, the second input port, the 3rd input port detects positive and negative zero crossing.
Connect with corresponding positive and negative zero cross detection circuit after each described positive and negative zero passage detection end series limiting resistor.
The colelctor electrode of phototriode of described first optocoupler, the second optocoupler the colelctor electrode of phototriode connect respectively and electrically connect with power supply VCC after respective pull-up resistor.
Present invention also offers a kind of high accuracy positive and negative zero passage detection method of three-phase ac signal, be adopt the positive and negative zero passage device of above-mentioned high accuracy three-phase ac signal to realize, specifically include following steps:
Step one: set:
The anode of the light emitting diode of the first optocoupler of first group of positive and negative zero cross detection circuit is connected with the U end of three-phase alternating current to be detected, and negative electrode is connected with the V end of three-phase alternating current to be detected; Corresponding, the signal of telecommunication of the phototriode colelctor electrode output of the first optocoupler is designated as: S1, and the signal of telecommunication of the phototriode colelctor electrode output of the second optocoupler is designated as: S2; The signal that first not gate, nor gate, the second not gate export is designated as respectively: P1, P2, P3;
The anode of the light emitting diode of the first optocoupler of second group of positive and negative zero cross detection circuit is connected with the U end of three-phase alternating current to be detected, and negative electrode is connected with the W end of three-phase alternating current to be detected; Corresponding, the signal of telecommunication of the phototriode colelctor electrode output of the first optocoupler is designated as: S3, and the signal of telecommunication of the phototriode colelctor electrode output of the second optocoupler is designated as: S4; The signal that first not gate, nor gate, the second not gate export is designated as respectively: P4, P5, P6;
The anode of the light emitting diode of the first optocoupler of the 3rd group of positive and negative zero cross detection circuit is connected with the V end of three-phase alternating current to be detected, and negative electrode is connected with the W end of three-phase alternating current to be detected; Corresponding, the signal of telecommunication of the phototriode colelctor electrode output of the first optocoupler is designated as: S5, and the signal of telecommunication of the phototriode colelctor electrode output of the second optocoupler is designated as: S6; The signal that first not gate, nor gate, the second not gate export is designated as respectively: P7, P8, P9;
Step 2: definition indicates flag1, flag2, flag3, flag4, flag5, flag6 as follows, and condition assignment is as follows:
(1), during S1 rising edge, flag1=1, flag2=0 are set;
During S2 rising edge, flag1=0, flag2=1 are set;
(2), during S3 rising edge, flag3=1, flag4=0 are set;
During S4 rising edge, flag3=0, flag4=1 are set;
(3), during S5 rising edge, flag5=1, flag6=0 are set;
During S6 rising edge, flag5=0, flag6=1 are set;
Step 3: the pulse width of square-wave signal P2, P5, P8 is measured by signal processing unit, and count value is N1, N2, N3 respectively;
Step 4: during according to (N1)/2, the value of flag1, flag2, it is judged that the positive and negative zero crossing of UV end, specific as follows:
(1) if flag1=1, flag2=0, then the negative sense zero crossing of burst pulse Q1, Q1 correspondence AC signal U, V is exported by its I/O delivery outlet 1;
(2) if flag1=0, flag2=1, then the positive going zeror crossing point of burst pulse Q2, Q2 correspondence AC signal U, V is exported by its I/O delivery outlet 2;
Step 5: during according to (N2)/2, the value of flag3, flag4, it is judged that the positive and negative zero crossing of UW end, specific as follows:
(1) if flag3=1, flag4=0, then the negative sense zero crossing of burst pulse Q3, Q3 correspondence AC signal U, W is exported by its I/O delivery outlet 3;
(2) if flag3=0, flag4=1, then the positive going zeror crossing point of burst pulse Q4, Q4 correspondence AC signal U, W is exported by its I/O delivery outlet 4;
Step 6: during according to (N2)/2, the value of flag5, flag6, it is judged that the positive and negative zero crossing of VW end, specific as follows:
(1) if flag5=1, flag6=0, then the negative sense zero crossing of burst pulse Q5, Q5 correspondence AC signal V, W is exported by its I/O delivery outlet 5;
(2) if flag5=0, flag6=1, then the positive going zeror crossing point of burst pulse Q6, Q6 correspondence AC signal V, W is exported by its I/O delivery outlet 6.
Compared with prior art, the beneficial effect that the present invention reaches: simple in construction, reliable and stable, easy to use, there is stronger capacity of resisting disturbance.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the positive and negative zero crossing detection device of high accuracy three-phase ac signal provided by the invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described. Following example are only for clearly illustrating technical scheme, and can not limit the scope of the invention with this.
As it is shown in figure 1, the high accuracy positive and negative zero crossing detection device of three-phase ac signal, including signal processing unit and three groups of positive and negative zero cross detection circuits. Preferably, the model of signal processing unit is: EPM240GT100C5. In order to the wantonly two alternate positive and negative zero crossings in three-phase ac signal U, V, W are detected, drawing the positive and negative zero passage detection end of UV, UW, VW tri-respectively, connect one to one with three groups of positive and negative zero cross detection circuits, concrete annexation is as follows:
For first group of positive and negative zero cross detection circuit:
After anode series limiting resistor R1, the R2 of the light emitting diode of the first optocoupler U1, the U end with three-phase ac signal to be detected is connected, and negative electrode is connected with the V end of three-phase ac signal to be detected. It is connected with power supply VCC after the colelctor electrode series connection pull-up resistor R3 of the phototriode of the first optocoupler U1, after the first not gate G1 that connects, accesses the I/O input port 1 of signal processing unit, the grounded emitter of the phototriode of the first optocoupler U1.
The anode of the light emitting diode of the second optocoupler U2 is connected with the V end of three-phase ac signal to be detected, and the anode of the light emitting diode of negative electrode and the first optocoupler U1 connects. It is connected with power supply VCC after the colelctor electrode series connection pull-up resistor R4 of the phototriode of the second optocoupler U2, after the second not gate G2 that connects, accesses the I/O input port 3 of signal processing unit, the grounded emitter of the phototriode of the second optocoupler U2.
The input of nor gate X1 connects the outfan of the outfan of the first not gate G1, the second not gate G2 respectively, and the outfan of nor gate X1 is connected with the I/O input port 2 of signal processing unit.
When the U-V end waveform of three-phase ac signal exports positive half cycle, the LEDs ON of the first optocoupler U1 is also luminous, the phototriode conducting of the first optocoupler U1, and output low level, after the first not gate G1 negates, exports high level; The light emitting diode cut-off of the second optocoupler U2 simultaneously, the phototriode cut-off of the second optocoupler U2, export high level, after the second not gate G2 negates, output low level, now, nor gate X1 output low level. When the U-V end waveform of three-phase ac signal exports negative half period, the LEDs ON of the second optocoupler U2 is also luminous, the phototriode conducting of the second optocoupler U2, and output low level, after the second not gate G2 negates, exports high level;The light emitting diode cut-off of the first optocoupler U1 simultaneously, the phototriode cut-off of the first optocoupler U1, export high level, after the first not gate G1 negates, output low level, now, nor gate X1 output low level.
Second group of positive and negative zero cross detection circuit, the 3rd group of positive and negative zero cross detection circuit circuit structure all identical with first group of positive and negative zero cross detection circuit.
For second group of positive and negative zero cross detection circuit:
After anode series limiting resistor R5, the R6 of the light emitting diode of the first optocoupler U3, the U end with three-phase ac signal to be detected is connected, and negative electrode is connected with the W end of three-phase ac signal to be detected. It is connected with power supply VCC after the colelctor electrode series connection pull-up resistor R7 of the phototriode of the first optocoupler U3, after the first not gate G3 that connects, accesses the I/O input port 4 of signal processing unit, the grounded emitter of the phototriode of the first optocoupler U3.
The anode of the light emitting diode of the second optocoupler U4 is connected with the V end of three-phase ac signal to be detected, and the anode of the light emitting diode of negative electrode and the first optocoupler U3 connects. It is connected with power supply VCC after the colelctor electrode series connection pull-up resistor R8 of the phototriode of the second optocoupler U4, after the second not gate G4 that connects, accesses the I/O input port 6 of signal processing unit, the grounded emitter of the phototriode of the second optocoupler U4.
The input of nor gate X2 connects the outfan of the outfan of the first not gate G3, the second not gate G4 respectively, and the outfan of nor gate X2 is connected with the I/O input port 5 of signal processing unit.
When the U-W end waveform of three-phase ac signal exports positive half cycle, the LEDs ON of the first optocoupler U3 is also luminous, the phototriode conducting of the first optocoupler U3, and output low level, after the first not gate G3 negates, exports high level; The light emitting diode cut-off of the second optocoupler U4 simultaneously, the phototriode cut-off of the second optocoupler U4, export high level, after the second not gate G4 negates, output low level, now, nor gate X2 output low level. When the U-W end waveform of three-phase ac signal exports negative half period, the LEDs ON of the second optocoupler U4 is also luminous, the phototriode conducting of the second optocoupler U4, and output low level, after the second not gate G4 negates, exports high level; The light emitting diode cut-off of the first optocoupler U3 simultaneously, the phototriode cut-off of the first optocoupler U3, export high level, after the first not gate G3 negates, output low level, now, nor gate X2 output low level.
Same, for the 3rd group of positive and negative zero cross detection circuit:
After anode series limiting resistor R9, the R10 of the light emitting diode of the first optocoupler U5, the V end with three-phase ac signal to be detected is connected, and negative electrode is connected with the W end of three-phase ac signal to be detected. It is connected with power supply VCC after the colelctor electrode series connection pull-up resistor R11 of the phototriode of the first optocoupler U5, after the first not gate G5 that connects, accesses the I/O input port 7 of signal processing unit, the grounded emitter of the phototriode of the first optocoupler U5.
The anode of the light emitting diode of the second optocoupler U6 is connected with the V end of three-phase ac signal to be detected, and the anode of the light emitting diode of negative electrode and the first optocoupler U5 connects. It is connected with power supply VCC after the colelctor electrode series connection pull-up resistor R12 of the phototriode of the second optocoupler U6, after the second not gate G6 that connects, accesses the I/O input port 9 of signal processing unit, the grounded emitter of the phototriode of the second optocoupler U6.
The input of nor gate X3 connects the outfan of the outfan of the first not gate G5, the second not gate G6 respectively, and the outfan of nor gate X3 is connected with the I/O input port 8 of signal processing unit.
When the V-W end waveform of three-phase ac signal exports positive half cycle, the LEDs ON of the first optocoupler U5 is also luminous, the phototriode conducting of the first optocoupler U5, and output low level, after the first not gate G5 negates, exports high level; The light emitting diode cut-off of the second optocoupler U6 simultaneously, the phototriode cut-off of the second optocoupler U6, export high level, after the second not gate G6 negates, output low level, now, nor gate X3 output low level. When the V-W end waveform of three-phase ac signal exports negative half period, the LEDs ON of the second optocoupler U6 is also luminous, the phototriode conducting of the second optocoupler U6, and output low level, after the second not gate G6 negates, exports high level; The light emitting diode cut-off of the first optocoupler U5 simultaneously, the phototriode cut-off of the first optocoupler U5, export high level, after the first not gate G5 negates, output low level, now, nor gate X3 output low level.
A kind of high accuracy three-phase ac signal provided by the invention positive and negative zero passage detection method is based on above-mentioned zero crossing detection device and realizes, and comprises the steps:
Step one: the colelctor electrode of the phototriode of optocoupler U1, the colelctor electrode of phototriode of optocoupler U2, the colelctor electrode of phototriode of optocoupler U3, the colelctor electrode of phototriode of optocoupler U4, the colelctor electrode of phototriode of optocoupler U5, optocoupler U6 phototriode colelctor electrode output signal be respectively defined as S1, S2, S3, S4, S5, S6; The input signal of 1 ~ I/O input port, I/O input port 9 is respectively defined as: P1, P2, P3, P4, P5, P6, P7, P8, P9.
Step 2: definition indicates flag1, flag2, flag3, flag4, flag5, flag6 as follows, and condition assignment is as follows:
(1), during S1 rising edge, flag1=1, flag2=0 are set;
During S2 rising edge, flag1=0, flag2=1 are set;
(2), during S3 rising edge, flag3=1, flag4=0 are set;
During S4 rising edge, flag3=0, flag4=1 are set;
(3), during S5 rising edge, flag5=1, flag6=0 are set;
During S6 rising edge, flag5=0, flag6=1 are set;
Step 3: the pulse width of square-wave signal P2, P5, P8 is measured by signal processing unit, and count value is N1, N2, N3 respectively;
Step 4: during according to (N1)/2, the value of flag1, flag2, it is judged that the positive and negative zero crossing of UV end, specific as follows:
(1) if flag1=1, flag2=0, then the negative sense zero crossing of burst pulse Q1, Q1 correspondence AC signal U, V is exported by its I/O delivery outlet 1;
(2) if flag1=0, flag2=1, then the positive going zeror crossing point of burst pulse Q2, Q2 correspondence AC signal U, V is exported by its I/O delivery outlet 2;
Step 5: during according to (N2)/2, the value of flag3, flag4, it is judged that the positive and negative zero crossing of UW end, specific as follows:
(1) if flag3=1, flag4=0, then the negative sense zero crossing of burst pulse Q3, Q3 correspondence AC signal U, W is exported by its I/O delivery outlet 3;
(2) if flag3=0, flag4=1, then the positive going zeror crossing point of burst pulse Q4, Q4 correspondence AC signal U, W is exported by its I/O delivery outlet 4;
Step 6: during according to (N2)/2, the value of flag5, flag6, it is judged that the positive and negative zero crossing of VW end, specific as follows:
(1) if flag5=1, flag6=0, then the negative sense zero crossing of burst pulse Q5, Q5 correspondence AC signal V, W is exported by its I/O delivery outlet 5;
(2) if flag5=0, flag6=1, then the positive going zeror crossing point of burst pulse Q6, Q6 correspondence AC signal V, W is exported by its I/O delivery outlet 6.
High accuracy three-phase ac signal provided by the invention positive and negative zero passage detection method has stronger capacity of resisting disturbance.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the technology of the present invention principle; can also making some improvement and deformation, these improve and deformation also should be regarded as protection scope of the present invention.
Claims (4)
1. the high accuracy positive and negative zero crossing detection device of three-phase ac signal, it is characterized in that, including signal processing unit, three groups of positive and negative zero cross detection circuits being connected between three-phase alternating current to be detected and signal processing unit, three groups of positive and negative zero passage detection ends are drawn in wantonly two combinations in three-phase alternating current to be detected, and each group of positive and negative zero passage detection end connects one group of positive and negative zero cross detection circuit;
Described positive and negative zero cross detection circuit includes: the first optocoupler, the second optocoupler, the first not gate, the second not gate and nor gate; After the light emitting diode of the first optocoupler and the light emitting diode reverse parallel connection of the second optocoupler, it is connected between corresponding positive and negative zero passage detection end; The colelctor electrode of the phototriode of the first optocoupler connect first non-behind the door, be connected with the first input port of signal processing unit, the grounded emitter of the phototriode of the first optocoupler; The colelctor electrode of the phototriode of the second optocoupler connect second non-behind the door, be connected with the 3rd input port of signal processing unit, the grounded emitter of the phototriode of the second optocoupler; Two inputs of described nor gate are connected with the outfan of the outfan of the first not gate, the second not gate respectively, and the outfan of nor gate is connected with the second input port of signal processing unit;
The colelctor electrode of the phototriode of the first optocoupler, the second optocoupler the colelctor electrode of phototriode also electrically connect with power supply VCC respectively;
The level signal that described signal processing unit exports according to the first input port, the second input port, the 3rd input port detects positive and negative zero crossing.
2. the positive and negative zero crossing detection device of high accuracy three-phase ac signal according to claim 1, it is characterised in that connect with corresponding positive and negative zero cross detection circuit after each described positive and negative zero passage detection end series limiting resistor.
3. the positive and negative zero crossing detection device of high accuracy three-phase ac signal according to claim 1, it is characterized in that, the colelctor electrode of phototriode of described first optocoupler, the second optocoupler the colelctor electrode of phototriode connect respectively and electrically connect with power supply VCC after respective pull-up resistor.
4. one kind adopts the method that the positive and negative zero crossing detection device of high accuracy three-phase ac signal according to any one of claim 1 ~ 3 carries out zero passage detection, it is characterised in that comprise the steps:
Step one: set:
The anode of the light emitting diode of the first optocoupler of first group of positive and negative zero cross detection circuit is connected with the U end of three-phase alternating current to be detected, and negative electrode is connected with the V end of three-phase alternating current to be detected; Corresponding, the signal of telecommunication of the phototriode colelctor electrode output of the first optocoupler is designated as: S1, and the signal of telecommunication of the phototriode colelctor electrode output of the second optocoupler is designated as: S2; The signal that first not gate, nor gate, the second not gate export is designated as respectively: P1, P2, P3;
The anode of the light emitting diode of the first optocoupler of second group of positive and negative zero cross detection circuit is connected with the U end of three-phase alternating current to be detected, and negative electrode is connected with the W end of three-phase alternating current to be detected; Corresponding, the signal of telecommunication of the phototriode colelctor electrode output of the first optocoupler is designated as: S3, and the signal of telecommunication of the phototriode colelctor electrode output of the second optocoupler is designated as: S4; The signal that first not gate, nor gate, the second not gate export is designated as respectively: P4, P5, P6;
The anode of the light emitting diode of the first optocoupler of the 3rd group of positive and negative zero cross detection circuit is connected with the V end of three-phase alternating current to be detected, and negative electrode is connected with the W end of three-phase alternating current to be detected; Corresponding, the signal of telecommunication of the phototriode colelctor electrode output of the first optocoupler is designated as: S5, and the signal of telecommunication of the phototriode colelctor electrode output of the second optocoupler is designated as: S6; The signal that first not gate, nor gate, the second not gate export is designated as respectively: P7, P8, P9;
Step 2: definition indicates flag1, flag2, flag3, flag4, flag5, flag6 as follows, and condition assignment is as follows:
(1), during S1 rising edge, flag1=1, flag2=0 are set;
During S2 rising edge, flag1=0, flag2=1 are set;
(2), during S3 rising edge, flag3=1, flag4=0 are set;
During S4 rising edge, flag3=0, flag4=1 are set;
(3), during S5 rising edge, flag5=1, flag6=0 are set;
During S6 rising edge, flag5=0, flag6=1 are set;
Step 3: the pulse width of square-wave signal P2, P5, P8 is measured by signal processing unit, and count value is N1, N2, N3 respectively;
Step 4: during according to (N1)/2, the value of flag1, flag2, it is judged that the positive and negative zero crossing of UV end, specific as follows:
(1) if flag1=1, flag2=0, then the negative sense zero crossing of burst pulse Q1, Q1 correspondence AC signal U, V is exported by its I/O delivery outlet 1;
(2) if flag1=0, flag2=1, then the positive going zeror crossing point of burst pulse Q2, Q2 correspondence AC signal U, V is exported by its I/O delivery outlet 2;
Step 5: during according to (N2)/2, the value of flag3, flag4, it is judged that the positive and negative zero crossing of UW end, specific as follows:
(1) if flag3=1, flag4=0, then the negative sense zero crossing of burst pulse Q3, Q3 correspondence AC signal U, W is exported by its I/O delivery outlet 3;
(2) if flag3=0, flag4=1, then the positive going zeror crossing point of burst pulse Q4, Q4 correspondence AC signal U, W is exported by its I/O delivery outlet 4;
Step 6: during according to (N2)/2, the value of flag5, flag6, it is judged that the positive and negative zero crossing of VW end, specific as follows:
(1) if flag5=1, flag6=0, then the negative sense zero crossing of burst pulse Q5, Q5 correspondence AC signal V, W is exported by its I/O delivery outlet 5;
(2) if flag5=0, flag6=1, then the positive going zeror crossing point of burst pulse Q6, Q6 correspondence AC signal V, W is exported by its I/O delivery outlet 6.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108303582A (en) * | 2018-03-12 | 2018-07-20 | 吉林特纳普节能技术有限公司 | A kind of ultra-low-power high-precision alternating voltage zero-crossing point detection circuit and method |
| CN112615614A (en) * | 2020-11-19 | 2021-04-06 | 北京智芯微电子科技有限公司 | Double-edge zero-crossing signal acquisition and digital filtering circuit, method and device |
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| CN112615614A (en) * | 2020-11-19 | 2021-04-06 | 北京智芯微电子科技有限公司 | Double-edge zero-crossing signal acquisition and digital filtering circuit, method and device |
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