CN203909138U - General three-phase AC signal synchronous sampling device - Google Patents
General three-phase AC signal synchronous sampling device Download PDFInfo
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- CN203909138U CN203909138U CN201420326906.8U CN201420326906U CN203909138U CN 203909138 U CN203909138 U CN 203909138U CN 201420326906 U CN201420326906 U CN 201420326906U CN 203909138 U CN203909138 U CN 203909138U
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Abstract
The utility model discloses a general three-phase AC signal synchronous sampling device, which comprises an AC sensor, an isolating filter, an A/D analog-digital converter, a zero-crossing detection circuit and a phase-locked frequency multiplying circuit, wherein an output end of the AC sensor is connected with an input of the isolating filter, an output end of the isolating filter is divided into six paths, the six paths are connected with an input end of the A/D analog-digital converter, and any path of the six paths is connected with an input end of the A/D analog-digital converter after passing through the zero-crossing detection circuit and the phase-locked frequency multiplying circuit. The general three-phase AC signal synchronous sampling device adopts the high-precision, high-speed and multi-channel A/D analog-digital converter to construct a data acquisition system with excellent performance, improves the acquisition accuracy and reliability of three-phase AC parameters to the maximum extent, represents signal characteristics truly, has the advantages of low cost, simple operation, wide adaptability, efficient and practical entire circuit, high real-time performance, high versatility and good expandability, and can be integrated in various kinds of three-phase AC sampling test equipment for usage in a modular manner.
Description
Technical field
The utility model belongs to computer application field, is specifically related to a kind of general three-phase ac signal synchronized sampling device.
Background technology
In the sampling of three-phase ac signal, if reach more satisfactory sample effect, realize the real-time analysis of signal, not only to measure amplitude and the precision of tested voltage of a certain moment, electric current, the more important thing is when the AC signal cycle changes, all want to realize the synchronized sampling to three-phase ac signal.Because proper synchronized sampling is difficult to realize, so how to reduce the problem that sample-synchronous deviation is an important research always.Consider the instability in three-phase ac signal cycle, and also can there is certain deviation to the measurement in cycle, if sampled with the fixed cycle, tend to occur that sampling interval and signal period are asynchronous, produce spectrum leakage problem, the error that causes result of calculations such as voltage effective value, performance number, sampling precision is lower.
Utility model content
The purpose of this utility model is to provide a kind of general three-phase ac signal synchronized sampling device, has realized the synchronized sampling of three-phase ac signal.
For achieving the above object, the utility model adopts following technical scheme: comprise ac sensor, separation filter, A/D analog to digital converter, zero cross detection circuit and phase-locking frequency multiplication circuit, wherein the output terminal of ac sensor and the input end of separation filter are connected, the output terminal of separation filter is divided into six tunnels, six tunnels are all connected with the input end of A/D analog to digital converter, and any road in six tunnels is connected with the input end of A/D analog to digital converter through zero cross detection circuit, phase-locking frequency multiplication circuit.
Described zero cross detection circuit comprises comparator circuit chip, resistance, the first diode and the second diode, comparator circuit chip comprises first input end and the second input end, first input end is connected with one end of resistance, the other end of resistance is connected with the output terminal of separation filter, the second input end grounding of comparator circuit chip, the first diode and the second diode are set between first input end and the second input end, the plus earth of the first diode, the negative pole of the first diode is connected with the first input end of comparator circuit chip, the positive pole of the second diode is connected with the first input end of comparator circuit chip, the minus earth of the second diode, the output terminal of comparator circuit chip is connected with the input end of phase-locking frequency multiplication circuit.
The model of described comparator circuit chip is LM319.
Described phase-locking frequency multiplication circuit comprises phase-locked loop circuit and frequency multiplier circuit, the input end of frequency multiplier circuit, the output terminal of zero cross detection circuit are connected with two input ends of phase-locked loop circuit respectively, the output terminal of phase-locked loop circuit is divided into two-way, one tunnel is connected with the input end of frequency multiplier circuit, and another road is connected with A/D analog to digital converter.
Described phase-locked loop circuit is CD4046 phase-locked loop circuit.
Described frequency multiplier circuit is counter circuit CD4024.
Described A/D analog to digital converter is analog-to-digital conversion device ADS8556.
Compared with prior art, the beneficial effect the utlity model has: the utility model is by arranging ac sensor, separation filter, A/D analog to digital converter, zero cross detection circuit and phase-locking frequency multiplication circuit, each phase voltage of three-phase alternating current and each phase current signal are through ac sensor, after separation filter, as measured signal, be sent to the sample input end of each passage of hyperchannel A/D analog to digital converter, simultaneously by a road wherein through zero cross detection circuit convert to and measured signal with square-wave signal frequently, this square-wave signal is delivered to the input end of phase-locked loop circuit, utilize hardware phase lock high precision frequency multiplier circuit to produce 2N sampling pulse, this sampling pulse is as the run simultaneously start trigger signal sampling of each channel sample of A/D analog to digital converter of high-speed multiple channel, complete the synchronous accurately real-time sampling to each phase voltage of three-phase alternating current and each phase current signal.The utility model overcomes the pattern of available technology adopting system software algorithm complexity, and improve sampling precision, by zero cross detection circuit combined with hardware frequency multiplication of phase locked loop circuit, realize the generation to the synchronous tracking of AC signal and multiple spot pulse in one-period, adopt multichannel high-speed a/d analog to digital converter to realize the Multipoint synchronous real-time sampling to three-phase alternating voltage current signal in one-period, avoid by sampling interval produced spectrum leakage problem asynchronous with the signal period, variation to signal certain limit frequency has good tracking characteristics, can guarantee the synchronously sampling accurately and reliably in real time to each phase voltage electric current of three-phase alternating current, improved real-time.
The utility model adopts hardware phase lock high precision loop circuit and zero cross detection circuit to realize the synchronized sampling of three-phase ac signal; Adopt the data acquisition system (DAS) of the excellent performance that high-precision high-speed hyperchannel AD analog to digital converter builds, improve to greatest extent collection accuracy and the reliability of three-phase alternating current parameter, true reappearance signal characteristic.
The utility model adopts simple components and parts, realize three-phase alternating current synchronized sampling, possess with low cost, simple to operate, adapt to wide, whole circuit highly effective, real-time is high, highly versatile, also possesses good extensibility, can modularization be integrated in various three-phase AC sampling testing apparatuss and uses.
Further, in the utility model, A/D analog to digital converter is analog-to-digital conversion device ADS8556, and the ADS8556 for parallel 630kSPS sampling rate, can meet accurate sampling request completely.
Accompanying drawing explanation
Fig. 1 is that circuit of the present utility model is realized theory diagram.
Fig. 2 is zero cross detection circuit schematic diagram.
Fig. 3 is the phase-locking frequency multiplication circuit of 12/24 frequency multiplication.
Fig. 4 is in the utility model application example, in each alternating current power frequency period, sample 12/24 point sampling pulse and sample waveform schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, content of the present utility model is described in further details, but actual fabrication structure of the present utility model is not limited in following embodiment.
Referring to Fig. 1, the utility model comprises ac sensor 1, separation filter 2, A/D analog to digital converter 3, zero cross detection circuit 4, phase-locking frequency multiplication circuit 5, wherein the output terminal of ac sensor 1 is connected with the input end of separation filter 2, the output terminal of separation filter 2 is divided into six tunnels, six tunnels are respectively A phase malleation sine wave signal, B phase voltage sine wave signal, C phase voltage sine wave signal, A phase current sine wave signal, B phase current sine wave signal, C phase current sine wave signal, six tunnels are all connected with the input end of A/D analog to digital converter 3, any road in six tunnels is through zero cross detection circuit 4, phase-locking frequency multiplication circuit 5 is connected with the input end of A/D analog to digital converter.Ac sensor 1 is for receiving each phase voltage of three-phase alternating current and each phase current signal, and zero cross detection circuit is used for receiving three-phase alternating current one phase voltage or a phase current signal.
Described phase-locking frequency multiplication circuit comprises phase-locked loop circuit and frequency multiplier circuit, the input end of frequency multiplier circuit, the output terminal of zero cross detection circuit are connected with two input ends of phase-locked loop circuit respectively, the output terminal of phase-locked loop circuit is divided into two-way, one tunnel is connected with the input end of frequency multiplier circuit, and another road is connected with A/D analog to digital converter.
Phase-locking frequency multiplication circuit can guarantee to produce 2N high frequency sampling pulse in one-period, and (N can be configured by counter) utilizes its rising edge or the sampling of negative edge triggering synchronous.Described phase-locked loop circuit is CD4046 phase-locked loop circuit.Described frequency multiplier circuit is counter circuit CD4024.Described A/D analog to digital converter is analog-to-digital conversion device ADS8556.
Referring to Fig. 3, in Fig. 3, the count value COUNT of phase-locking frequency multiplication circuit Counter circuit sends into phase comparator input end-comparison signal input end of phase-locked loop circuit, and count value COUNT is 2N frequency multiplication (setting of adjustment counter can change the numerical value of COUNT).Input signal is exported after the amplification shaping of phase-locked loop circuit inside, phase comparator, voltage controlled oscillator, output signal and input signal homophase, by the negative edge triggering collection of the frequency-doubled signal after locking, so just guaranteed to adopt 2N point in one changes cycle, improved the precision of sampling.
Referring to Fig. 2, described zero cross detection circuit 4 comprises comparator circuit chip, resistance R 1, the first diode T1 and the second diode T2, comparator circuit chip has the first input end of comprising and the second input end, first input end is connected with one end of resistance, the other end of resistance is connected with the output terminal of separation filter 2, the second input end grounding of comparator circuit chip, the first diode T1 and the second diode T2 are set between first input end and the second input end, the plus earth of the first diode T1, the negative pole of the first diode T1 is connected with the first input end of comparator circuit chip, the positive pole of the second diode T2 is connected with the first input end of comparator circuit chip, the minus earth of the second diode T2, the output terminal of comparator circuit chip is connected with the input end of phase-locking frequency multiplication circuit.The model of described comparator circuit chip is LM319.
Zero cross detection circuit 4 is shaped as square-wave signal by filtered input signal, and this signal is sent into phase comparator input end-reference signal input end of phase-locked loop circuit after the dividing potential drop range of decrease.
In the present embodiment, three-phase alternating current synchronized sampling device is mainly built by ac sensor 1, separation filter 2, analog to digital conversion circuit ADS8556, phase-locked loop circuit CD4046 sum counter circuit CD4024.
The key property of ADS8556 is as follows: 6 passage 16-bit successive approximation type a/d C; Every passage maximum data rate: parallel 630kSPS, serial 450kSPS; Can set maximum input voltage scope ± 12V; Be with internal reference able to programme: 0.5V～2.5V, 0.5V～3.0V; Can select parallel or serial mode.
This embodiment can realize the phase-locking frequency multiplication circuit of 12 or 24 frequencys multiplication, can in a cycle, to three-phase alternating voltage current signal, carry out 12 or 24 samplings, can meet accurate sampling request completely.
Referring to Fig. 4, Fig. 4 is that ac analog and the value that collects by the utility model contrast, the utility model has been realized the synchronized sampling of general three-phase ac signal as can be seen from Figure 4, improves to greatest extent collection accuracy and the reliability of three-phase alternating current parameter, true reappearance signal characteristic.
Principle of work of the present utility model and process are: each phase voltage of three-phase alternating current and each phase current signal are through ac sensor, after separation filter, as measured signal, be sent to the sample input end of each passage of hyperchannel A/D analog to digital converter, simultaneously by a road wherein through zero cross detection circuit convert to and measured signal with square-wave signal frequently, this square-wave signal is delivered to the input end of phase-locked loop circuit, utilize hardware phase-locked-loop and frequency multiplier circuit to produce 2N sampling pulse, this sampling pulse is as the run simultaneously start trigger signal sampling of each channel sample of A/D analog to digital converter of high-speed multiple channel, complete the synchronous accurately real-time sampling to each phase voltage of three-phase alternating current and each phase current signal.Wherein sampling pulse number 2N, can configure N according to the actual requirements in real time.
Claims (7)
1. the synchronized sampling device of a general three-phase ac signal, it is characterized in that, comprise ac sensor (1), separation filter (2), A/D analog to digital converter (3), zero cross detection circuit (4) and phase-locking frequency multiplication circuit (5), wherein the output terminal of ac sensor (1) is connected with the input end of separation filter (2), the output terminal of separation filter (2) is divided into six tunnels, six tunnels are all connected with the input end of A/D analog to digital converter (3), and any road in six tunnels is connected with the input end of A/D analog to digital converter through zero cross detection circuit (4), phase-locking frequency multiplication circuit (5).
2. the synchronized sampling device of a kind of general three-phase ac signal according to claim 1, it is characterized in that, described zero cross detection circuit (4) comprises comparator circuit chip, resistance, the first diode (T1) and the second diode (T2), comparator circuit chip comprises first input end and the second input end, first input end is connected with one end of resistance, the other end of resistance is connected with the output terminal of separation filter (2), the second input end grounding of comparator circuit chip, the first diode (T1) and the second diode (T2) are set between first input end and the second input end, the plus earth of the first diode (T1), the negative pole of the first diode (T1) is connected with the first input end of comparator circuit chip, the positive pole of the second diode (T2) is connected with the first input end of comparator circuit chip, the minus earth of the second diode (T2), the output terminal of comparator circuit chip is connected with the input end of phase-locking frequency multiplication circuit.
3. the synchronized sampling device of a kind of general three-phase ac signal according to claim 2, is characterized in that, the model of described comparator circuit chip is LM319.
4. the synchronized sampling device of a kind of general three-phase ac signal according to claim 1, it is characterized in that, described phase-locking frequency multiplication circuit (5) comprises phase-locked loop circuit and frequency multiplier circuit, the input end of frequency multiplier circuit, the output terminal of zero cross detection circuit are connected with two input ends of phase-locked loop circuit respectively, the output terminal of phase-locked loop circuit is divided into two-way, one tunnel is connected with the input end of frequency multiplier circuit, and another road is connected with A/D analog to digital converter.
5. the synchronized sampling device of a kind of general three-phase ac signal according to claim 3, is characterized in that, described phase-locked loop circuit is CD4046 phase-locked loop circuit.
6. the synchronized sampling device of a kind of general three-phase ac signal according to claim 3, is characterized in that, described frequency multiplier circuit is counter circuit CD4024.
7. the synchronized sampling device of a kind of general three-phase ac signal according to claim 1, is characterized in that, described A/D analog to digital converter (3) is analog-to-digital conversion device ADS8556.
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| CN201420326906.8U CN203909138U (en) | 2014-06-18 | 2014-06-18 | General three-phase AC signal synchronous sampling device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738725A (en) * | 2016-01-29 | 2016-07-06 | 山东鲁能智能技术有限公司 | Multipath alternating current split-phase synchronous sampling method and circuit |
| CN105974179A (en) * | 2016-07-01 | 2016-09-28 | 河北箱变电器有限公司 | Secondary equipment for monitoring partial discharge and temperature monitoring device |
| CN106054096A (en) * | 2016-07-01 | 2016-10-26 | 河北箱变电器有限公司 | Secondary equipment for monitoring partial discharging and temperature monitoring device |
| CN108761181A (en) * | 2018-03-07 | 2018-11-06 | 珠海欧比特宇航科技股份有限公司 | A kind of acquisition processing device and method of airborne 36V three-phase ac signals |
| CN109120267A (en) * | 2018-10-25 | 2019-01-01 | 南方电网科学研究院有限责任公司 | A kind of electric power signal synchronous sampling system and method |
| CN111650427A (en) * | 2020-06-11 | 2020-09-11 | 山西潞安环保能源开发股份有限公司五阳煤矿 | Voltage and current sampling device and method for coal mine circuit |
| CN113358937A (en) * | 2021-04-26 | 2021-09-07 | 广西电网有限责任公司电力科学研究院 | Signal synchronous sampling device in capacitor cable-free measurement |
| CN114019224A (en) * | 2021-09-22 | 2022-02-08 | 国营芜湖机械厂 | Aviation alternating current parameter testing method |
| CN115902681A (en) * | 2023-02-22 | 2023-04-04 | 江西省中碳数字能源技术有限公司 | Three-phase variable frequency power supply conversion efficiency test system |
| CN116481599A (en) * | 2023-06-25 | 2023-07-25 | 珠海矽敏科技有限公司 | Multichannel signal acquisition device and sensor system |
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2014
- 2014-06-18 CN CN201420326906.8U patent/CN203909138U/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738725A (en) * | 2016-01-29 | 2016-07-06 | 山东鲁能智能技术有限公司 | Multipath alternating current split-phase synchronous sampling method and circuit |
| CN105738725B (en) * | 2016-01-29 | 2018-11-13 | 山东鲁能智能技术有限公司 | Multichannel AC split-phase synchronous sampling method and circuit |
| CN105974179A (en) * | 2016-07-01 | 2016-09-28 | 河北箱变电器有限公司 | Secondary equipment for monitoring partial discharge and temperature monitoring device |
| CN106054096A (en) * | 2016-07-01 | 2016-10-26 | 河北箱变电器有限公司 | Secondary equipment for monitoring partial discharging and temperature monitoring device |
| CN108761181A (en) * | 2018-03-07 | 2018-11-06 | 珠海欧比特宇航科技股份有限公司 | A kind of acquisition processing device and method of airborne 36V three-phase ac signals |
| CN108761181B (en) * | 2018-03-07 | 2020-12-08 | 珠海欧比特宇航科技股份有限公司 | Airborne 36V three-phase alternating current signal acquisition and processing device and method |
| CN109120267A (en) * | 2018-10-25 | 2019-01-01 | 南方电网科学研究院有限责任公司 | A kind of electric power signal synchronous sampling system and method |
| CN111650427A (en) * | 2020-06-11 | 2020-09-11 | 山西潞安环保能源开发股份有限公司五阳煤矿 | Voltage and current sampling device and method for coal mine circuit |
| CN113358937A (en) * | 2021-04-26 | 2021-09-07 | 广西电网有限责任公司电力科学研究院 | Signal synchronous sampling device in capacitor cable-free measurement |
| CN114019224A (en) * | 2021-09-22 | 2022-02-08 | 国营芜湖机械厂 | Aviation alternating current parameter testing method |
| CN115902681A (en) * | 2023-02-22 | 2023-04-04 | 江西省中碳数字能源技术有限公司 | Three-phase variable frequency power supply conversion efficiency test system |
| CN116481599A (en) * | 2023-06-25 | 2023-07-25 | 珠海矽敏科技有限公司 | Multichannel signal acquisition device and sensor system |
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