CN204945235U - A kind of AC voltage sampling circuit - Google Patents
A kind of AC voltage sampling circuit Download PDFInfo
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- CN204945235U CN204945235U CN201520669022.7U CN201520669022U CN204945235U CN 204945235 U CN204945235 U CN 204945235U CN 201520669022 U CN201520669022 U CN 201520669022U CN 204945235 U CN204945235 U CN 204945235U
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Abstract
The utility model relates to a kind of AC voltage sampling circuit.Circuit is made up of power transformer T, safety electric capacity XC, voltage dependent resistor (VDR) RV, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, electric capacity C1, electric capacity C2, and wherein power transformer T pin 1 is connected with one end of safety electric capacity XC, voltage dependent resistor (VDR) RV after being connected with one end of resistance R1 again; Be to connect with safety electric capacity XC, voltage dependent resistor (VDR) RV after the pin 2 of power transformer T is connected with one end of resistance R2; The pin 3 of power transformer T is connected with resistance R3, resistance R4, resistance R6; Power transformer T pin 4 is connected with one end of resistance R3, the resistance R4 other end and resistance R5; The other end of resistance R5, the other end of resistance R6 are connected with one end of electric capacity C1, electric capacity C2 respectively.The utility model has double protection functions accuracy original text, circuit signal stabilized communication.
Description
Technical field
The utility model relates to sensing data acquisition technique field, specifically refers to a kind of AC voltage sampling circuit.
Background technology
At present, varied to the Acquisition Circuit of line voltage on the market, but basic skills is all similar.First be all AC signal alternating voltage being transferred to low pressure by high-voltage signal, then through the conversion of modulate circuit signal, the voltage signal required for gathering finally by AD.Existing Part Methods adopts transformer that high pressure is reduced to low pressure, then through calculation process, in this, the advantage of method serves insulation blocking effect, but have that error is large, cost is high, circuit board fabrication high in cost of production not enough; Also have plenty of the method adopting electric resistance partial pressure in addition, directly high-voltage signal is converted to low-voltage signal, then nurses one's health through multiple element circuit, as AD Acquisition Circuit etc.But AD gathers and also will consider to isolate ability secure communication with CPU, and solve bulky deficiency although do like this, cost is still higher, and circuit is easily breakdown, and design of integer electro-circuit is also comparatively loaded down with trivial details.
Utility model content
To be solved in the utility model is that, volume large for the error existing for existing mains voltage acquisition greatly, easily punctures the technical matters high with cost and provide a kind of AC voltage sampling circuit, and its principal feature is that circuit design is simple, precision is high and good stability.
Technical problem to be solved in the utility model can realize with crossing following technical scheme:
A kind of mains voltage collection circuit; first by the ac voltage signal of input by after filtering duplicate protection again through electric resistance partial pressure; then seal in resistor voltage divider circuit with the current mode voltage transformer (VT) that precision is high and gather its current signal; the current signal collected is exported by 1: 1; then the output signal of voltage transformer (VT) is converted to voltage signal by resistance; after being nursed one's health by this voltage signal integration again, finally A/D processor is exported in this voltage signal filtering.
In order to realize technique scheme, circuit described in the utility model is made up of power transformer T, safety electric capacity XC, voltage dependent resistor (VDR) RV, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, electric capacity C1, electric capacity C2, wherein power transformer T has 4 pins, pin 1 is connected with one end of resistance R1, and the other end of resistance R1 is connected with one end of safety electric capacity XC, voltage dependent resistor (VDR) RV and connects with voltage signal W afterwards; The pin 2 of power transformer T is connected with one end of resistance R2, and the other end of resistance R2 is connected with the other end of safety electric capacity XC, voltage dependent resistor (VDR) RV and connects with voltage signal N afterwards; The pin 3 of power transformer T is connected with one end of resistance R3, resistance R4, resistance R6, and connected node meets GND; The pin 4 of power transformer T is connected with one end of resistance R3, the resistance R4 other end and resistance R5; The other end of resistance R5, the other end of resistance R6 are connected with one end of electric capacity C1, electric capacity C2 respectively, and correspondence draws the line voltage ac signal acquisition end of line voltage AC signal V+ and line voltage AC signal V-respectively simultaneously; Another termination GND of electric capacity C1, electric capacity C2.
Have employed safety electric capacity and voltage dependent resistor (VDR) and just carried out duplicate protection before ac voltage signal input, then with the resistance of high-accuracy (Low Drift Temperature error per mille), alternating voltage dividing potential drop is gathered its electric current again, ensure that data just meet accuracy when passing through collection, the signal that collected electric current obtains after voltage transformer (VT) uses the resistance of precision (Low Drift Temperature error per mille) to convert voltage signal to again, ensure again that the accuracy of the signal that will gather, the voltage transformer (VT) used is with isolated high-voltage 3000V, so the signal after this processing of circuit can carry out safety with A/D processor, stabilized communication.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the utility model one road AC voltage sampling circuit.
Fig. 2 is that the utility model is applied in three-phase and four-line alternating current and gathers a kind of method.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, every road mains voltage collection circuit comprises power transformer T, safety electric capacity XC, voltage dependent resistor (VDR) RV, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, electric capacity C1, electric capacity C2.Safety electric capacity XC and voltage dependent resistor (VDR) RV is in parallel, a termination voltage signal W after in parallel, another termination is voltage signal N; Resistance R1 mono-terminal voltage signal W, the 1st pin of another termination voltage transformer (VT) T; Resistance R2 mono-termination voltage signal N, the 2nd pin of another termination voltage transformer (VT) T; Resistance R3 is in parallel with resistance R4, the 4th pin of the termination voltage transformer (VT) T after parallel connection, the 3rd pin of another termination voltage transformer (VT); 4th pin of resistance R5 mono-termination voltage transformer (VT) T; 3rd pin of resistance R6 mono-termination voltage transformer (VT) T; The other end of the one terminating resistor R5 of electric capacity C1, the other end ground connection of electric capacity C1; The other end of electric capacity C2 mono-terminating resistor R6, the other end ground connection of electric capacity C2; Finally between resistance R5 and electric capacity C1, there is signal V+, between resistance R6 and electric capacity C2, have signal V-; V+ and V-is exactly the line voltage AC signal that the utility model will gather.
Claims (1)
1. an AC voltage sampling circuit, it is characterized in that described circuit is made up of power transformer T, safety electric capacity XC, voltage dependent resistor (VDR) RV, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, electric capacity C1, electric capacity C2, wherein power transformer T has 4 pins, pin 1 is connected with one end of resistance R1, and the other end of resistance R1 is connected with one end of safety electric capacity XC, voltage dependent resistor (VDR) RV and connects with voltage signal W afterwards; The pin 2 of power transformer T is connected with one end of resistance R2, and the other end of resistance R2 is connected with the other end of safety electric capacity XC, voltage dependent resistor (VDR) RV and connects with voltage signal N afterwards; The pin 3 of power transformer T is connected with one end of resistance R3, resistance R4, resistance R6, and connected node meets GND; The pin 4 of power transformer T is connected with one end of resistance R3, the resistance R4 other end and resistance R5; The other end of resistance R5, the other end of resistance R6 are connected with one end of electric capacity C1, electric capacity C2 respectively, and correspondence draws the line voltage ac signal acquisition end of line voltage AC signal V+ and line voltage AC signal V-respectively simultaneously; Another termination GND of electric capacity C1, electric capacity C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520669022.7U CN204945235U (en) | 2015-09-01 | 2015-09-01 | A kind of AC voltage sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520669022.7U CN204945235U (en) | 2015-09-01 | 2015-09-01 | A kind of AC voltage sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204945235U true CN204945235U (en) | 2016-01-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520669022.7U Expired - Fee Related CN204945235U (en) | 2015-09-01 | 2015-09-01 | A kind of AC voltage sampling circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN204945235U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324326A (en) * | 2016-11-01 | 2017-01-11 | 广东京安交通科技有限公司 | Alternating voltage detection circuit and device |
| CN107422164A (en) * | 2017-09-01 | 2017-12-01 | 东莞市罗克韦新能源科技有限公司 | A kind of novel three-phase alternating-current is galvanically isolated sampling apparatus |
-
2015
- 2015-09-01 CN CN201520669022.7U patent/CN204945235U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324326A (en) * | 2016-11-01 | 2017-01-11 | 广东京安交通科技有限公司 | Alternating voltage detection circuit and device |
| CN107422164A (en) * | 2017-09-01 | 2017-12-01 | 东莞市罗克韦新能源科技有限公司 | A kind of novel three-phase alternating-current is galvanically isolated sampling apparatus |
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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 |
Granted publication date: 20160106 Termination date: 20180901 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |