CN202583361U - Power quality data acquisition circuit - Google Patents
Power quality data acquisition circuit Download PDFInfo
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- CN202583361U CN202583361U CN 201220220221 CN201220220221U CN202583361U CN 202583361 U CN202583361 U CN 202583361U CN 201220220221 CN201220220221 CN 201220220221 CN 201220220221 U CN201220220221 U CN 201220220221U CN 202583361 U CN202583361 U CN 202583361U
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- data acquisition
- acquisition circuit
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- digital converter
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Abstract
The utility model discloses a power quality data acquisition circuit. The power quality data acquisition circuit comprises an analog-digital converter adopting a chip of a ADS1278 model; the data acquisition circuit further comprises a sampling resistor, a differential amplifier and a reference voltage source module, wherein an analog signal which passes through the sampling resistor and the differential amplifier sequentially is transmitted to the analog-digital converter, the reference voltage source module used for providing reference voltage is in communication connection with the analog-digital converter. By selecting the high-performance analog-digital converter adopting the chip of the ADS1278 model, the data acquisition circuit is advantageous in structural superiority, multiple channels, high precision, low temperature drift and low noise. With the high-performance peripheral devices selected, the data acquisition circuit which is constructed by the peripheral devices is advantageous in simple structure as well as stable and reliable performance. The data acquisition circuit is particularly suitable for power data acquisition in the power industry, and the data acquisition circuit has achieved good effect. Compared with similar systems constructed by other technologies, the data acquisition circuit is obviously advantageous in simple structure, reliability, high precision and low cost.
Description
Technical field
The utility model relates to a kind of data acquisition circuit, relates in particular to the simple power quality data Acquisition Circuit of a kind of circuit structure.
Background technology
Power quality analysis belongs to high-end three-phase power line supervision/measuring system, and this type commercial Application need accurately be carried out hyperchannel image data simultaneously with high dynamic range, particular sample speed.In order to obtain the highest system accuracy, must correct handling from the signal of sensor (CT, PT), satisfying the requirement of ADC input range, thereby guarantee that the performance index of DAS satisfy the requirement of country variant relevant criterion.
The general AD converter that Acquisition Circuit adopted will be realized adopting simultaneously must have the employing retainer at each passage, goes the rounds sampling, and just there is phase error in this.Simultaneously, in order to reduce the also necessary preposition complicated filter device of noise with unwanted noise filtering.In addition, for the precision of the defined that is up to state standards, also must adopt the AD converter more than at least 12.This just makes that circuit structure is complicated, cost is higher.
The utility model content
The purpose of the utility model is to overcome deficiency of the prior art, provides a kind of circuit structure simple power quality data Acquisition Circuit.
For realizing above-mentioned purpose, said power quality data Acquisition Circuit is characterized in that said data acquisition circuit comprises analog to digital converter, and it is the chip of ADS1278 that said analog to digital converter adopts model; And; Said data acquisition circuit also comprises sampling resistor, differential amplifier and reference voltage source module; Wherein, Simulating signal ground warp sampling resistor and differential amplifier in order transfers to said analog to digital converter, is used to provide the reference voltage source module of reference voltage source to be connected with said analog to digital converter communication.
Preferably, said data acquisition circuit also comprises wave filter, and simulating signal ground warp sampling resistor, wave filter and differential amplifier in order transfers to said analog to digital converter.
Preferably, said wave filter is passive low-pass first order filter.
Preferably, said reference voltage source module employing model is the chip of MAX6133.
The beneficial effect of the utility model is, said power quality data Acquisition Circuit is through selecting this high performance AD converter of ADS1278; Give full play to framework advantage and hyperchannel, high precision, low temperature drift, the low noise speciality of this device; Select high performance peripheral components simultaneously, made up a data acquisition system (DAS) simple in structure, stable and reliable for performance, especially be fit to this occasion of power industry electrical energy data acquiring; Obtained good effect; Compare the homogeneous system that other technologies make up, maximum characteristics are simple in structure, reliable, and precision is high, cost is low relatively.
Description of drawings
Fig. 1 shows the functional-block diagram of an embodiment of the utility model.
Fig. 2 shows the functional-block diagram of another embodiment of the utility model.
Fig. 3 shows the circuit diagram of the reference voltage source module shown in Fig. 1 or Fig. 2.
Fig. 4 shows the circuit diagram of the sampling resistor, wave filter and the differential amplifier that connect in order shown in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is done further detailed explanation:
In an embodiment of the utility model, as shown in Figure 1, said power quality data Acquisition Circuit comprises analog to digital converter 1, sampling resistor 2, wave filter 3, differential amplifier 4 and reference voltage source module 5.Wherein, Simulating signal ground warp sampling resistor 2, wave filter 3 and differential amplifier 4 in order transfers to said analog to digital converter 1; Convert digital signal into by this analog to digital converter 1, in the process, the reference voltage source module 5 that is connected with said analog to digital converter 1 communication is used to provide reference voltage source.
It is the chip of ADS1278 that said analog to digital converter 1 adopts model, and this chip is 8 passages, 24 sigma-delta framework industry analog to digital converters that TI is produced; This built-in chip type a plurality of independently high-order chopped wave stabilizing modulators and FIR data filter, can support 8 passages to sample simultaneously, support high speed, high precision, low speed, 4 kinds of patterns of low-power consumption, sampling rate is up to 118ksps.Owing to can sample simultaneously, the phase error in the time of can eliminating sampling, this point is particularly suitable for the occasion of the multinomial collection of electric energy.In addition, interface between this chip and the processor uses universal serial bus, makes to be connected easily between this chip and the processor, has good compatibility.
The course of work of this power quality data Acquisition Circuit is: simulating signal transfers to differential amplifier 4 after the processing of ground warp sample circuit and wave filter 3 in order; Nurse one's health, this differential amplifier 4 is amplified to signal the size that is complementary with analog to digital converter 1 range.Model is that the built-in modulator of the analog to digital converter 1 of ADS1278 detects signal that differential amplifier 4 is transmitted and itself and reference voltage source are done comparison, obtains a low noise digital output stream.
What the ADS1278 chip was exported is two's complement, most significant digit is-symbol position.During negative value, most significant digit is 1, otherwise is 0 when output voltage.The scope of the digital quantity of ADS1278 chip output is:
ADS1278 chip can be selected mode of operation through pin MODE [1:0], realizes the optimum balance between sample rate, precision, the power consumption.See the following form:
| MODE[1:0] | Model selection | Sampling rate |
| 00 | At a high speed | 128，000 |
| 01 | High resolving power | 52，734 |
| 10 | Low-power consumption | 52，734 |
| 11 | Low rate | 10,547 |
The data serial communication port output after the conversion of ADS1278 chip can be adopted SPI agreement or frame synchronization mode.Data output protocol and form can be selected in following several modes as required.Data output protocol and form are selected and can be set through pin FOMAT [2:0], see the following form:
| FOMAT[2:0] | Interface protocol | Output mode | Data stream format |
| 000 | SPI | TDM | Dynamically |
| 001 | SPI | TDM | Fixing |
| 010 | SPI | Discrete | -- |
| 011 | Frame synchronization | TDM | Dynamically |
| 100 | Frame synchronization | TDM | Fixing |
| 101 | Frame synchronization | Discrete | -- |
| 110 | Modulating mode | -- | -- |
Further; Output formula by the ADS1278 chip:
can know; The performance of reference voltage source can produce very big influence to the output of analog to digital converter 1, and is most important.In this circuit, adopting model is the chip core devices of voltage source module 5 as a reference of MAX6133.This device can reach 16 μ VP-P low noises under the situation of output 2.5V (0.1Hz to 10Hz), can satisfy the demand of electric energy sampling.Simultaneously, it also has extremely low temperature coefficient 3ppm/ ° C (maximal value), can well adapt to the rugged surroundings of industry spot.The design of said reference voltage source module 5 is as shown in Figure 3.
Fig. 4 shows the circuit diagram of the sampling resistor 2, wave filter 3 and the differential amplifier 4 that connect in order shown in Fig. 1, and the sampling resistor 2, wave filter 3 and the differential amplifier 4 that connect in order are called the amplifier modulate circuit again.As shown in Figure 4, the AC signal of 0 ~ 690v that said amplifier modulate circuit will be imported from the outside is sent in the differential amplifier 4 through a wave filter 3 then and amplifies through the dividing potential drop of sampling resistor 2, is amplified to the amplitude that is fit to the input of ADS1278 chip.This wave filter 3 can be a passive low-pass first order filter.
In another embodiment of the utility model, as shown in Figure 2, said power quality data Acquisition Circuit analog to digital converter 1, sampling resistor 2, differential amplifier 4 and reference voltage source module 5.Wherein, Simulating signal ground warp sampling resistor 2 in order transfers to said analog to digital converter 1 with differential amplifier 4; Convert digital signal into by this analog to digital converter 1, in the process, the reference voltage source module 5 that is connected with institute analog to digital converter 1 communication is used to provide reference voltage source.
Can find out; It is that core realizes in the power quality analysis requirement to Acquisition Circuit that this circuit adopts based on 24 of the sigma-delta framework, 8 passage ADS1278, because the superiority of the framework of ADS1278 chip own, can realize under the situation of preposition simple (even needing) wave filter 3 that hyperchannel sample simultaneously; Can also reach 16 above precision at least; Exceed the national standard requirement, simplified circuit structure greatly, reduced cost.
Being merely the utility model preferred embodiment in sum, is not the practical range that is used for limiting the utility model.Be that all equivalences of doing according to the content of the utility model claim change and modification, all should belong to the technological category of the utility model.
Claims (4)
1. power quality data Acquisition Circuit, it is characterized in that: said data acquisition circuit comprises analog to digital converter, it is the chip of ADS1278 that said analog to digital converter adopts model; And; Said data acquisition circuit also comprises sampling resistor, differential amplifier and reference voltage source module; Wherein, Simulating signal ground warp sampling resistor and differential amplifier in order transfers to said analog to digital converter, is used to provide the reference voltage source module of reference voltage source to be connected with said analog to digital converter communication.
2. power quality data Acquisition Circuit according to claim 1 is characterized in that: said data acquisition circuit also comprises wave filter, and simulating signal ground warp sampling resistor, wave filter and differential amplifier in order transfers to said analog to digital converter.
3. power quality data Acquisition Circuit according to claim 2 is characterized in that: said wave filter is passive low-pass first order filter.
4. according to any described power quality data Acquisition Circuit in the claim 1 to 3, it is characterized in that: it is the chip of MAX6133 that said reference voltage source module adopts model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220220221 CN202583361U (en) | 2012-05-16 | 2012-05-16 | Power quality data acquisition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220220221 CN202583361U (en) | 2012-05-16 | 2012-05-16 | Power quality data acquisition circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202583361U true CN202583361U (en) | 2012-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220220221 Expired - Fee Related CN202583361U (en) | 2012-05-16 | 2012-05-16 | Power quality data acquisition circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107797595A (en) * | 2016-09-05 | 2018-03-13 | 瑞昱半导体股份有限公司 | With the voltage stabilizing circuit for eliminating noise |
| CN110696671A (en) * | 2019-09-06 | 2020-01-17 | 恒大智慧充电科技有限公司 | Signal detection method, computer equipment and computer readable storage medium |
| CN112290948A (en) * | 2020-10-30 | 2021-01-29 | 中国兵器工业集团第二一四研究所苏州研发中心 | High-precision analog-to-digital conversion circuit based on ADS1278 |
-
2012
- 2012-05-16 CN CN 201220220221 patent/CN202583361U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107797595A (en) * | 2016-09-05 | 2018-03-13 | 瑞昱半导体股份有限公司 | With the voltage stabilizing circuit for eliminating noise |
| CN107797595B (en) * | 2016-09-05 | 2020-03-31 | 瑞昱半导体股份有限公司 | Voltage stabilizing circuit with noise elimination function |
| CN110696671A (en) * | 2019-09-06 | 2020-01-17 | 恒大智慧充电科技有限公司 | Signal detection method, computer equipment and computer readable storage medium |
| CN112290948A (en) * | 2020-10-30 | 2021-01-29 | 中国兵器工业集团第二一四研究所苏州研发中心 | High-precision analog-to-digital conversion circuit based on ADS1278 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20160516 |