CN2864697Y - Voltage isolation sampling device - Google Patents
Voltage isolation sampling device Download PDFInfo
- Publication number
- CN2864697Y CN2864697Y CN 200520135499 CN200520135499U CN2864697Y CN 2864697 Y CN2864697 Y CN 2864697Y CN 200520135499 CN200520135499 CN 200520135499 CN 200520135499 U CN200520135499 U CN 200520135499U CN 2864697 Y CN2864697 Y CN 2864697Y
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- resistance
- circuit
- voltage
- voltage follower
- transformer
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Abstract
A voltage insulated sampling device provides a voltage sampling circuit with accurate sampling, safe operation and low cost. The invention is formed by a transformer T, a dividing circuit and a voltage follower, wherein, the original coil of transformer T is connected with the electric system, while its output is connected with the dividing circuit, the output of dividing circuit is connected with the input of voltage follower, the output of voltage follower is connected with the circuit of next step, the dividing circuit is formed by resistances R1 and R2, the voltage follower is formed by an operation amplifier F and a resistance R4. The utility model has accurate sampling, non phase shift, better insulation, safe operation and low cost.
Description
Technical field
The utility model relates to a kind of voltage sampling apparatus, belongs to the detection technique field.
Background technology
The voltage sample mode that is used for devices such as reactive-load compensation, various trigger, control circuit in the known electric system mainly contains two kinds: one is to use voltage transformer (VT), and two are to use resitstance voltage divider.Preceding a kind of method cost is higher, can make us and can't bear in some device.Though a kind of method cost in back is low, pick-up unit is not isolated with electric system, and the high voltage of electric system is easy to enter testing circuit, and this not only can cause components and parts to damage the life security that also might jeopardize the operator.
Summary of the invention
The utility model is used to overcome the deficiencies in the prior art and a kind of voltage isolation sampling apparatus of sampling accurate, safe in utilization, with low cost is provided.
The alleged problem of the utility model realizes with following technical proposals:
A kind of voltage isolation sampling apparatus, it is made up of transformer T, bleeder circuit and voltage follower, and wherein, the primary coil of transformer T connects electric system, and secondary coil connects bleeder circuit; Described bleeder circuit is made up of resistance R 1, R2, and resistance R 1, R2 are connected into series circuit, the secondary coil of two termination transformer T of series circuit, the input end of the output termination voltage follower of its serial connection point; Described voltage follower is made up of operational amplifier F, resistance R 4, and resistance R 4 is connected between the reverse input end and output terminal of operational amplifier F, the connecting resistance of the input end in the same way R1 of operational amplifier F, the serial connection point of R2, and its output terminal is the signal output part of device.
Above-mentioned voltage isolation sampling apparatus, increase a RC phase-shift circuit between described bleeder circuit and the voltage follower, described RC phase-shift circuit is made up of resistance R 3, capacitor C, they are connected into series circuit, the serial connection point of other end connecting resistance R1, the R2 of resistance R 3, the other end ground connection of capacitor C, the output signal of their serial connections point connects the input end in the same way of operational amplifier F.
The utility model adopts transformer T that the voltage of electric system is carried out isolated buck, voltage signal after the step-down is adjusted by bleeder circuit earlier, compensated by the phase deviation of RC phase-shift circuit to transformer T then, the signal after the compensation uses for the next stage circuit after voltage follower reduces internal resistance.The utility model is not only sampled accurately, no phase deviation, and isolation performance is good, and is safe in utilization, and reduced cost.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further specified.
Fig. 1 is the utility model electricity theory diagram;
Fig. 2 is the utility model electrical schematic diagram.
Embodiment
Among Fig. 2, system voltage is added on the primary coil of transformer T, just obtains the low voltage signal of isolating with electric system on the secondary coil of transformer T.This signal is added on the RC phase-shift circuit of being made up of resistance R 3, capacitor C after the bleeder circuit dividing potential drop that resistance R 1, R2 form; Because transformer has reactance, there are certain deviation in the phase place of gained low voltage signal and system voltage, this phase differential is after the compensation of RC phase-shift circuit, obtain the low tension signal identical with the voltage-phase of electric system, export behind the voltage follower of this signal via operational amplifier F, resistance R 4 compositions, use for the next stage circuit.The effect of voltage follower is under the situation that guarantees sampled signal amplitude and phase invariant, and the internal resistance of output signal is reduced, and increases the carrying load ability of signal.The parameter value of choose reasonable resistance R 3, capacitor C and other elements can obtain desirable sampled signal.
Claims (2)
1, a kind of voltage isolation sampling apparatus is characterized in that, it is made up of transformer T, bleeder circuit and voltage follower, and wherein, the primary coil of transformer T connects electric system, and secondary coil connects bleeder circuit; Described bleeder circuit is made up of resistance R 1, R2, and resistance R 1, R2 are connected into series circuit, the secondary coil of two termination transformer T of series circuit, the input end of the output termination voltage follower of its serial connection point; Described voltage follower is made up of operational amplifier F, resistance R 4, and resistance R 4 is connected between the reverse input end and output terminal of operational amplifier F, the connecting resistance of the input end in the same way R1 of operational amplifier F, the serial connection point of R2, and its output terminal is the signal output part of device.
2, according to the described voltage isolation sampling apparatus of claim 1, it is characterized in that, increase a RC phase-shift circuit between described bleeder circuit and the voltage follower, described RC phase-shift circuit is made up of resistance R 3, capacitor C, they are connected into series circuit, the serial connection point of other end connecting resistance R1, the R2 of resistance R 3, the other end ground connection of capacitor C, the output signal of their serial connections point connects the input end in the same way of operational amplifier F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520135499 CN2864697Y (en) | 2005-12-30 | 2005-12-30 | Voltage isolation sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520135499 CN2864697Y (en) | 2005-12-30 | 2005-12-30 | Voltage isolation sampling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2864697Y true CN2864697Y (en) | 2007-01-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520135499 Expired - Fee Related CN2864697Y (en) | 2005-12-30 | 2005-12-30 | Voltage isolation sampling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2864697Y (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101483427B (en) * | 2008-01-08 | 2011-08-31 | 弥亚微电子（上海）有限公司 | Isolative transmission circuit |
| CN102445583A (en) * | 2010-10-13 | 2012-05-09 | 深圳市领步科技有限公司 | Detection method for voltage signals of power energy quality monitoring device and circuit as well as application thereof |
| CN102539891A (en) * | 2012-02-22 | 2012-07-04 | 华为技术有限公司 | Method and device for acquiring primary voltage of transformer |
| CN103368525A (en) * | 2013-06-17 | 2013-10-23 | 成都荣耀科技有限公司 | Signal conditioning module of distribution transformer remote monitoring system |
| CN103368524A (en) * | 2013-06-17 | 2013-10-23 | 成都荣耀科技有限公司 | Signal conditioning circuit for remote monitoring system of distribution transformer |
| CN102103157B (en) * | 2009-12-21 | 2013-11-06 | 艾默生网络能源***北美公司 | Direct voltage isolated sampling device |
| CN103698579A (en) * | 2013-12-30 | 2014-04-02 | 长沙奥托自动化技术有限公司 | Direct-current voltage sampling device of low-voltage frequency converter |
| CN105372476A (en) * | 2015-12-04 | 2016-03-02 | 重庆臻远电气有限公司 | Circuit suitable for performing DC voltage sampling on two ends of capacitor |
| CN107202914A (en) * | 2017-05-05 | 2017-09-26 | 中国电力科学研究院 | A kind of high accuracy wide band high pressure signal condition system and method |
| CN109030909A (en) * | 2018-07-13 | 2018-12-18 | 北京和信瑞通电力技术股份有限公司 | A kind of distribution one or two times fusions three-phase resistance reactance divided voltage sensor |
| CN117740182A (en) * | 2024-02-19 | 2024-03-22 | 成都市易冲半导体有限公司 | Thermistor detection circuit and terminal equipment |
-
2005
- 2005-12-30 CN CN 200520135499 patent/CN2864697Y/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101483427B (en) * | 2008-01-08 | 2011-08-31 | 弥亚微电子（上海）有限公司 | Isolative transmission circuit |
| CN102103157B (en) * | 2009-12-21 | 2013-11-06 | 艾默生网络能源***北美公司 | Direct voltage isolated sampling device |
| CN102445583A (en) * | 2010-10-13 | 2012-05-09 | 深圳市领步科技有限公司 | Detection method for voltage signals of power energy quality monitoring device and circuit as well as application thereof |
| CN102539891A (en) * | 2012-02-22 | 2012-07-04 | 华为技术有限公司 | Method and device for acquiring primary voltage of transformer |
| CN103368525A (en) * | 2013-06-17 | 2013-10-23 | 成都荣耀科技有限公司 | Signal conditioning module of distribution transformer remote monitoring system |
| CN103368524A (en) * | 2013-06-17 | 2013-10-23 | 成都荣耀科技有限公司 | Signal conditioning circuit for remote monitoring system of distribution transformer |
| CN103698579A (en) * | 2013-12-30 | 2014-04-02 | 长沙奥托自动化技术有限公司 | Direct-current voltage sampling device of low-voltage frequency converter |
| CN105372476A (en) * | 2015-12-04 | 2016-03-02 | 重庆臻远电气有限公司 | Circuit suitable for performing DC voltage sampling on two ends of capacitor |
| CN107202914A (en) * | 2017-05-05 | 2017-09-26 | 中国电力科学研究院 | A kind of high accuracy wide band high pressure signal condition system and method |
| CN109030909A (en) * | 2018-07-13 | 2018-12-18 | 北京和信瑞通电力技术股份有限公司 | A kind of distribution one or two times fusions three-phase resistance reactance divided voltage sensor |
| CN117740182A (en) * | 2024-02-19 | 2024-03-22 | 成都市易冲半导体有限公司 | Thermistor detection circuit and terminal equipment |
| CN117740182B (en) * | 2024-02-19 | 2024-05-03 | 成都市易冲半导体有限公司 | Thermistor detection circuit and terminal equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: BAODING TIANWEI BAOBIAN ELECTRICAL CO.LTD. Free format text: FORMER OWNER: TIANWEI GROUP CO., LTD., BAODING Effective date: 20081114 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20081114 Address after: No 2399, West Print-Rite Road, Baoding, Hebei: 071056 Patentee after: Baoding Tianwei Baobian Electric Co., Ltd. Address before: Baoding, Hebei Province, high street, chemical fiber North Road, 128 Jin Di garden complex building, zip code: 071051 Patentee before: Baoding Tianwei Group Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070131 Termination date: 20131230 |