CN204256026U - A kind of voltage sampling circuit - Google Patents
A kind of voltage sampling circuit Download PDFInfo
- Publication number
- CN204256026U CN204256026U CN201420763992.9U CN201420763992U CN204256026U CN 204256026 U CN204256026 U CN 204256026U CN 201420763992 U CN201420763992 U CN 201420763992U CN 204256026 U CN204256026 U CN 204256026U
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- China
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- pin
- electric capacity
- output terminal
- photoelectrical coupler
- silicon rectifier
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Abstract
The utility model provides a kind of voltage sampling circuit, and this sample circuit comprises silicon rectifier, the first resistance, the first electric capacity, photoelectrical coupler, the second electric capacity and the 3rd electric capacity, a pin of the input end of silicon rectifier is connected with power firestreak, another pin is connected with zero-power line, one end of first resistance is connected with a pin of the output terminal of silicon rectifier, the other end is connected with a pin of the input end of photoelectrical coupler, the positive pole of the first electric capacity is connected with a pin of the input end of photoelectrical coupler, the other end is connected with a pin of the output terminal of silicon rectifier, the emitter pin ground connection of the output terminal of photoelectrical coupler, the collector pin of output terminal is connected with the positive pole of the second electric capacity and one end of the 3rd electric capacity respectively, the other end of the second electric capacity is connected with voltage sample end respectively with the other end of the 3rd electric capacity.This sample circuit is not owing to adopting coil transformation, therefore it is little to have volume, the advantage that integrated level is high.
Description
Technical field
The utility model relates to a kind of circuit, particularly relates to a kind of voltage sampling circuit.
Background technology
Traditional electric and electronic technology is sampled mainly through two kinds of means to AC220V:
1, AC mutual induction module, by coil mutual inductance, reduced by voltage, through overcommutation, filtering obtains stable simulating signal.
2, by transformer pressure-reducing, more stable simulating signal is waited until through rectifying and wave-filtering.
Both is all by coil decompression principle, safe analog voltage 220V voltage being dropped to can gather.Current and current main-stream D.C. regulated power supply has not adopted voltage mode, and adopt Switching Power Supply pattern, therefore these 2 have individual shortcoming clearly: need coil transformation, and coil module volume is relatively all larger, adopts volume of transformer will be larger if extra.
In view of above-mentioned defect, the utility model creator, through research and test for a long time, finally obtains the utility model.
Summary of the invention
The purpose of this utility model is to provide a kind of voltage sampling circuit, in order to overcome above-mentioned technological deficiency.
For achieving the above object, the technical solution adopted in the utility model is: provide a kind of voltage sampling circuit, and this sample circuit comprises silicon rectifier, the first resistance, the first electric capacity, photoelectrical coupler, the second electric capacity and the 3rd electric capacity, a pin of the input end of described silicon rectifier is connected with power firestreak, another pin is connected with zero-power line, one end of described first resistance is connected with a pin of the output terminal of described silicon rectifier, the other end is connected with a pin of the input end of described photoelectrical coupler, the positive pole of described first electric capacity is connected with a pin of the input end of described photoelectrical coupler, the other end is connected with a pin of the output terminal of described silicon rectifier, the emitter pin ground connection of the output terminal of described photoelectrical coupler, the collector pin of output terminal is connected with the positive pole of described second electric capacity and one end of described 3rd electric capacity respectively, the other end of described second electric capacity is connected with voltage sample end respectively with the other end of the 3rd electric capacity.
Further, this sample circuit also comprises the second resistance and power supply, and one end of described second resistance is connected with the collector pin of the output terminal of described photoelectrical coupler, and the other end is connected with described power supply.
The beneficial effects of the utility model are compared with the prior art: provide a kind of voltage sampling circuit, and this sample circuit is not owing to adopting coil transformation, therefore it is little to have volume, the advantage that integrated level is high.
Accompanying drawing explanation
Fig. 1 is voltage sampling circuit circuit diagram of the present utility model.
Embodiment
As shown in Figure 1, a kind of voltage sampling circuit that the utility model provides comprises silicon rectifier U1, the first resistance R1, the first electric capacity C1, photoelectrical coupler U2, the second electric capacity C2, the 3rd electric capacity C3, the second resistance R2 and power supply VCC.The pin 1 of the input end of described silicon rectifier U1 is connected with power firestreak L, pin 2 is connected with zero-power line N, one end of described first resistance R1 is connected with the pin 3 of the output terminal of described silicon rectifier U1, the other end is connected with the input end pin 1 of described photoelectrical coupler U2, and described first resistance R1 is used for step-down.The positive pole of described first electric capacity C1 is connected with the input end pin 1 of described photoelectrical coupler U2, and the other end is connected with the output terminal pin 4 of described silicon rectifier U1, is also connected with the input end pin 2 of described photoelectrical coupler U2, and described first electric capacity C1 is used for filtering.Emitter pin 4 ground connection of the output terminal of described photoelectrical coupler U2, the collector pin 5 of output terminal is connected with one end of the positive pole of the second electric capacity C2, one end of the 3rd electric capacity C3 and the second resistance R2 respectively, and the other end of described second electric capacity C2 is connected with voltage sample end MCU_AD respectively with the other end of the 3rd electric capacity C3.The other end of described second resistance R2 is connected with described power supply VCC.Described second electric capacity C2 and the 3rd electric capacity C3 is used for filtering and voltage stabilizing.The model that silicon rectifier U1 in the present embodiment adopts is DB107S, and maximum by 1000V voltage, even if there is 1000V surge also can not have impact to this chip, be also only about 1mA at 1000V voltage, current, therefore power consumption is very low.The model that photoelectrical coupler U2 adopts is 4N35, when inputting civil power and changing, electric current also changes thereupon, then the input light intensity of photoelectrical coupler U2 can change, thus the on-state rate between output collector and emitter also can change, namely uprise when civil power becomes large then collector and emitter on-state rate, output voltage diminishes, when civil power diminishes, then output voltage becomes large.This sample circuit is not owing to adopting coil transformation, therefore it is little to have volume, the advantage that integrated level is high.
The foregoing is only preferred embodiment of the present utility model, is only illustrative for the utility model, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes in the spirit and scope that the utility model claim limits to it, amendment, even equivalence, but all will fall in protection domain of the present utility model.
Claims (2)
1. a voltage sampling circuit, is characterized in that, this sample circuit comprises silicon rectifier, the first resistance, the first electric capacity, photoelectrical coupler, the second electric capacity and the 3rd electric capacity, a pin of the input end of described silicon rectifier is connected with power firestreak, another pin is connected with zero-power line, one end of described first resistance is connected with a pin of the output terminal of described silicon rectifier, the other end is connected with a pin of the input end of described photoelectrical coupler, the positive pole of described first electric capacity is connected with a pin of the input end of described photoelectrical coupler, the other end is connected with a pin of the output terminal of described silicon rectifier, the emitter pin ground connection of the output terminal of described photoelectrical coupler, the collector pin of output terminal is connected with the positive pole of described second electric capacity and one end of described 3rd electric capacity respectively, the other end of described second electric capacity is connected with voltage sample end respectively with the other end of the 3rd electric capacity.
2. voltage sampling circuit as claimed in claim 1, it is characterized in that, this sample circuit also comprises the second resistance and power supply, and one end of described second resistance is connected with the collector pin of the output terminal of described photoelectrical coupler, and the other end is connected with described power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420763992.9U CN204256026U (en) | 2014-12-08 | 2014-12-08 | A kind of voltage sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420763992.9U CN204256026U (en) | 2014-12-08 | 2014-12-08 | A kind of voltage sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204256026U true CN204256026U (en) | 2015-04-08 |
Family
ID=52960319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420763992.9U Expired - Fee Related CN204256026U (en) | 2014-12-08 | 2014-12-08 | A kind of voltage sampling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204256026U (en) |
-
2014
- 2014-12-08 CN CN201420763992.9U patent/CN204256026U/en not_active Expired - Fee Related
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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: 20150408 Termination date: 20161208 |