CN205506920U - Alternating voltage collection system - Google Patents
Alternating voltage collection system Download PDFInfo
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- CN205506920U CN205506920U CN201521110827.4U CN201521110827U CN205506920U CN 205506920 U CN205506920 U CN 205506920U CN 201521110827 U CN201521110827 U CN 201521110827U CN 205506920 U CN205506920 U CN 205506920U
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Abstract
The utility model discloses an alternating voltage collection system, its characterized in that collection system includes that the current -limiting branch road, the alternating voltage that connect gradually change branch road, dc bias branch road, impedance conversion and follow the branch road and the processing branch road, wherein, the current -limiting is propped up to have connect on the road and is surveyed the alternating voltage input. The utility model has the advantages that, can reduce the influence that the device is floated to main temperature at the uniform temperature within range, improve measurement accuracy and reduced measuring error, the processing method is simple, and the cost is lower, is fit for using widely on a large scale.
Description
Technical field
This utility model belongs to voltage measurement technologies field, is specifically related to a kind of AC voltage sampling device.
Background technology
At present, the collection of alternating voltage mainly uses halfwave rectifier filtering technique: use diode to carry out rectification and electric capacity is filtered.The shortcoming of the method is that the drift of diode temperature is big, filters fractional harmonic component and by increase measurement error and reduce certainty of measurement after capacitor filtering.
Summary of the invention
The purpose of this utility model be according to above-mentioned the deficiencies in the prior art in place of, it is provided that a kind of AC voltage sampling device, this AC voltage sampling device, can precise acquisition alternating voltage by using program filtering method will not impact output waveform.
This utility model purpose realizes being completed by techniques below scheme:
A kind of AC voltage sampling device, it is characterized in that current limliting branch road, alternating voltage converting branch, Dc bias branch road, impedance transformation that described harvester includes being sequentially connected with and follow branch road and software processes branch road, wherein, described current limliting branch road is connected to tested ac voltage input.
Described current limliting branch road includes resistance R1 and the current transformer T1 primary coil being sequentially connected in series, and wherein, described resistance R1 is connected with described tested ac voltage input.
Described alternating voltage converting branch includes current transformer T1 secondary coil, resistance R2 and electric capacity C1 successively, and wherein, described resistance R2 and described current transformer T1 parallel connection of secondary windings, described electric capacity C1 connects with described current transformer T1 secondary coil.
Described Dc bias branch road is at described alternating voltage converting branch and described impedance transformation and follows between branch road, including the supply voltage VCC1 being sequentially connected with, resistance R3, resistance R4 and GND1.
Described impedance transformation includes resistance R5 and operational amplifier with following branch road, and described operational amplifier in-phase input end connects described Dc bias branch road, and described resistance R5 connects described operational amplifier out-phase input and the outfan of described operational amplifier.
The utility model has the advantages that, can reduce the impact of main temperature drift device in certain temperature range, improve certainty of measurement and reduce measurement error, processing method is simple, and cost is relatively low, is suitable for large-scale promotion and uses.
Accompanying drawing explanation
Fig. 1 is AC voltage sampling principle of device schematic diagram in this utility model.
Detailed description of the invention
Feature of the present utility model and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, in order to the understanding of technical staff of the same trade:
Embodiment: as shown in Figure 1, the present embodiment is specifically related to a kind of AC voltage sampling device and method of work thereof, can measure civil power or other alternating voltage in real time, this AC voltage sampling device includes the current limliting branch road being sequentially connected with, alternating voltage converting branch, Dc bias branch road, impedance transformation and follows branch road and software processes branch road.
Current limliting branch road is used for current limliting so that alternating voltage to be tested is transformed into small area analysis, including the resistance R1 being sequentially connected in series and current transformer T1 primary coil, the one tested ac voltage input of termination of resistance R1, the foot 1 of another termination current transformer T1 primary coil, the foot 4 of current transformer T1 primary coil then meets PGND, and wherein, resistance R1 is current-limiting resistance, resistance is between 100-900K Ω, the no-load voltage ratio of current transformer T1 is 1:1, and its resistance is hundred ohm level, is negligible.
Alternating voltage converting branch is for being converted into low AC voltage the small area analysis in current limliting branch road and cutting off direct current therein, including current transformer T1 secondary coil, resistance R2 and electric capacity C1, the foot 2,3 that resistance R2 two ends connect current transformer T1 secondary coil respectively is in parallel for small area analysis is converted into low AC voltage to constitute, and electric capacity C1 then connects the foot 2 of current transformer T1 secondary coil and cuts off direct current to constitute series connection；Wherein, R2 is load resistance, and resistance is hundred ohm level.
Dc bias branch road is at alternating voltage converting branch and described impedance transformation and follows between branch road, and including the supply voltage VCC1 being sequentially connected with, resistance R3 and resistance R4, wherein R3 and R4 is direct current biasing resistance；By adding a DC offset voltage in electric capacity C1 rear end, it is superimposed upon on DC offset voltage with the low AC voltage negative loop input thus becomes on the occasion of alternating voltage.
Impedance transformation and follow branch road for improving on the occasion of the input impedance of alternating voltage, including resistance R5 and operational amplifier, operational amplifier in-phase input end 3 connects Dc bias branch road, resistance R5 concatenation operation amplifier out-phase input 2 and the outfan 1 of operational amplifier, form follower, improve input impedance on the occasion of alternating voltage through this follower.
Software processes branch road includes ADC and MCU, and follower output voltage enters ADC and is acquired, and is carried out program filtering and calculating process by MCU.
It should be noted that V1, VCC1, VCC2, V_out GND1 altogether.
As it is shown in figure 1, the method for work of AC voltage sampling device comprises the steps: in the present embodiment
A, in () tested alternating voltage V_test input current limliting branch road, current transformer T1 primary coil series resistance R1 carries out current limliting, and tested alternating voltage V_test is transformed into small area analysis I1, and the computing formula of small area analysis I1 is:
I1=V_test/R1；
In formula, the resistance of R1 is it is known that can be between 100-900K Ω；
B () small area analysis I1 enters alternating voltage converting branch, small area analysis I1 is converted to small area analysis I2 by the current transformer T1 secondary coil of 1:1 no-load voltage ratio, because the no-load voltage ratio of current transformer T1 is 1:1, therefore I1=I2；
Small area analysis I2 is converted into low AC voltage V1, wherein, V1=I2*R2 by resistance R2, and in formula, R2 is load resistance, and resistance is it is known that be typically selected to hundred ohm level；
Low-voltage V1 is cut off wherein direct current after electric capacity C1 and is become output voltage V2, wherein, V2=V1, and wherein, C1 is chosen as the electric capacity of nf level, and therefore V2 is approximately equal to V1；
C () alternating voltage converting branch output voltage V2 enters in Dc bias branch road, and be superimposed upon on DC offset voltage and be changed into output voltage V3, and the computing formula of output voltage V3 is as follows:
V3=V2+VCC1*R4/(R3+R4)；
In formula, VCC1 is known supply voltage；R3 and R4 is direct current biasing resistance known to resistance；
D () Dc bias branch road output voltage V3 connects impedance transformation and follows operational amplifier in-phase input end in branch road and carry out impedance transformation output voltage V_out, wherein, V_out=V3；
E () output voltage V_out enters in software processes branch road, ADC is acquired, and is carried out program filtering and calculating process by MCU, calculates output voltage V_out, and computational methods are:
Use 2 circulations (circulation and outer circulation in i.e.) to carry out ADC and gather calculating, interior circulation is ADC continuous acquisition 30 times, it is array counting with AD [30], array AD [30] is carried out bubbling method sort from small to large, remove the i.e. maximum AD of spike burr [29], select the meansigma methods of AD [28]-AD [19], it may be assumed that
V_out = V_erf*( AD[19]+AD[20] + AD[21] + AD[22] +
AD[23] + AD[24] + AD[25] + AD[26] + AD[27] + AD[28] )/10/ 4095
In formula, V_erf is the reference voltage of ADC；4095 be the ADC total step number of 12, i.e. acquisition resolution be V_erf/4095；
Outer circulation is that certain interval of time enters ADC sampling, it is spaced 20 times, each sampled result is compared and takes maximum, it is ensured that outer circulation interval can gather a complete cycle for 20 times, and the test value V_test that the reading value V_out of such ADC calculates is exactly the crest voltage of alternating current；
F () calculates tested alternating voltage V_test according to the V_out calculated, computing formula is:
V_test=(V_out-VCC1*R4/(R3+R4)) * R1/R2
In formula, each value is given value or has calculated that corresponding value, therefore can calculate the value of V_test, and the civil power said due to us refers to virtual value, so V_test/1.414 is only the final measurement that we are required.
Claims (5)
1. an AC voltage sampling device, it is characterized in that current limliting branch road, alternating voltage converting branch, Dc bias branch road, impedance transformation that described harvester includes being sequentially connected with and follow branch road and software processes branch road, wherein, described current limliting branch road is connected to tested ac voltage input.
A kind of AC voltage sampling device the most according to claim 1, it is characterised in that described current limliting branch road includes resistance R1 and the current transformer T1 primary coil being sequentially connected in series, and wherein, described resistance R1 is connected with described tested ac voltage input.
A kind of AC voltage sampling device the most according to claim 1, it is characterized in that described alternating voltage converting branch includes current transformer T1 secondary coil, resistance R2 and electric capacity C1 successively, wherein, described resistance R2 and described current transformer T1 parallel connection of secondary windings, described electric capacity C1 connects with described current transformer T1 secondary coil.
A kind of AC voltage sampling device the most according to claim 1, it is characterized in that described Dc bias branch road at described alternating voltage converting branch and described impedance transformation and is followed between branch road, including the supply voltage VCC1 being sequentially connected with, resistance R3, resistance R4 and GND1.
A kind of AC voltage sampling device the most according to claim 1, it is characterized in that described impedance transformation and follow branch road and include resistance R5 and operational amplifier, described operational amplifier in-phase input end connects described Dc bias branch road, and described resistance R5 connects described operational amplifier out-phase input and the outfan of described operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521110827.4U CN205506920U (en) | 2015-12-29 | 2015-12-29 | Alternating voltage collection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521110827.4U CN205506920U (en) | 2015-12-29 | 2015-12-29 | Alternating voltage collection system |
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| CN205506920U true CN205506920U (en) | 2016-08-24 |
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| CN201521110827.4U Active CN205506920U (en) | 2015-12-29 | 2015-12-29 | Alternating voltage collection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445536A (en) * | 2015-12-29 | 2016-03-30 | 上海贝电实业（集团）股份有限公司 | Alternating current voltage acquisition device and working method thereof |
| CN107942126A (en) * | 2018-01-15 | 2018-04-20 | 广东美的暖通设备有限公司 | Current detection circuit, method, readable storage medium storing program for executing and power electronic equipment |
-
2015
- 2015-12-29 CN CN201521110827.4U patent/CN205506920U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445536A (en) * | 2015-12-29 | 2016-03-30 | 上海贝电实业（集团）股份有限公司 | Alternating current voltage acquisition device and working method thereof |
| CN107942126A (en) * | 2018-01-15 | 2018-04-20 | 广东美的暖通设备有限公司 | Current detection circuit, method, readable storage medium storing program for executing and power electronic equipment |
| CN107942126B (en) * | 2018-01-15 | 2020-03-06 | 广东美的暖通设备有限公司 | Current detection circuit, method, readable storage medium and power electronic device |
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