CN201331553Y - DC (direct current) voltage measuring circuit with isolation - Google Patents
DC (direct current) voltage measuring circuit with isolation Download PDFInfo
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- CN201331553Y CN201331553Y CNU200820170814XU CN200820170814U CN201331553Y CN 201331553 Y CN201331553 Y CN 201331553Y CN U200820170814X U CNU200820170814X U CN U200820170814XU CN 200820170814 U CN200820170814 U CN 200820170814U CN 201331553 Y CN201331553 Y CN 201331553Y
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Abstract
The utility model relates to a DC voltage measuring circuit with isolation. The DC voltage measuring circuit comprises a voltage division circuit, a voltage-to-frequency conversion circuit and an optical coupler U2. The DC voltage sampling signals are connected with the voltage division circuit; the voltage division circuit is connected with the input terminal of the voltage-to-frequency conversion circuit; the output terminal of the voltage-to-frequency conversion circuit is connected with the input terminal of the optical coupler U2; and the output terminal of the optical coupler U2 is connected with a DSP digital signal processing circuit. After the DC voltage sampling signals are transmitted to the voltage-to-frequency conversion circuit; the voltage-to-frequency conversion circuit outputs frequency signals to the optical coupler; after being isolated, the frequency signals are transmitted to a DSP (digital signal processor) digital signal processing circuit; and the coupler achieves the function of isolating the DC circuit and the control circuit, and ensures the good measurement linearity and the strong anti-interference ability, so that the stability and the reliability of the circuit are greatly improved.
Description
Technical field
The utility model relates to a kind of dc voltage measurement circuit, relates in particular to the dc voltage measurement circuit that a kind of band simple in structure, that antijamming capability strong, the measure linear degree is good is isolated.
Background technology
Traditional direct current measurement circuit generally is that the magnitude of voltage that the DC voltage sample circuit obtains is converted to frequency signal by the voltage-frequency change-over circuit, directly flows to digital signal processing circuit then.Sort circuit is not owing to isolate between control circuit and DC circuit, and two circuit can influence each other, the phase mutual interference, cause circuit stability to reduce, and reliability is not high.
Summary of the invention
The utility model mainly solves traditional direct current measurement circuit buffer circuit is not set between control circuit and DC circuit, and two circuit can influence each other, the phase mutual interference, causes circuit stability to reduce the technical matters that reliability is not high; Provide that a kind of simple in structure, antijamming capability is strong, the measure linear degree is good, the dc voltage measurement circuit that the band that circuit stability and reliability all improve is greatly isolated.
Above-mentioned technical matters of the present utility model is mainly solved by following technical proposals: the utility model comprises the voltage-frequency change-over circuit that links to each other with the DC voltage sampled signal, described DC voltage sampled signal connects bleeder circuit, bleeder circuit links to each other with the input end of described voltage-frequency change-over circuit again, the input end of the output termination optocoupler U2 of voltage-frequency change-over circuit, the output termination DSP digital signal processing circuit of optocoupler U2.The DC voltage sampled signal reduces voltage through the bleeder circuit dividing potential drop, flows to the voltage-frequency change-over circuit, and voltage-frequency change-over circuit output frequency signal is given optocoupler, and after light-coupled isolation, the frequency signal after will isolating again flows to the DSP digital signal processing circuit.Optocoupler plays the effect of isolated DC circuit and control circuit, guarantees that the measure linear degree is good, and antijamming capability is strong, and circuit stability and reliability improve greatly.
As preferably, described bleeder circuit comprises continuous resistance R 1 and R8, be parallel with stabilivolt Z1 on the resistance R 8, capacitor C 1, described voltage-frequency change-over circuit comprises voltage-frequency converter U1, the end that resistance R 1 links to each other with R8 links to each other with 7 pin of voltage-frequency converter U1, another termination DC voltage sampled signal of resistance R 1, the other end of resistance R 8 links to each other with 4 pin of voltage-frequency converter U1,4 pin of voltage-frequency converter U1 are through the parallel circuit of resistance R 3 connecting resistance R2 and electric capacity E1,1 pin of the other end of this parallel circuit and voltage-frequency converter U1,6 pin link to each other, the 4 pin ground connection of voltage-frequency converter U1; 3 pin of voltage-frequency converter U1 connect 2 pin of optocoupler U2, the 3 foot meridian capacitor C3 ground connection of while voltage-frequency converter U1,1 pin of optocoupler U2 meets voltage VDD through resistance R 6,8 pin of voltage-frequency converter U1 are through resistance R 5, capacitor C 2 ground connection, 8 pin of voltage-frequency converter U1 meet voltage VDD simultaneously, the tie point of resistance R 5 and capacitor C 2 links to each other with 5 pin of voltage-frequency converter U1, and 2 pin of voltage-frequency converter U1 are through resistance R 4 ground connection; The 3 pin ground connection of optocoupler U2,4 pin of optocoupler U2 meet voltage VCC through resistance R 7, and 4 pin of optocoupler U2 connect described DSP digital signal processing circuit simultaneously.Resistance R 1 and R8 play the dividing potential drop effect, and the DC voltage sampled signal dividing potential drop of input is flowed to 7 pin of voltage-frequency converter again, and the voltage that stabilivolt Z1 stablizes 7 pin makes it to be unlikely to go beyond the scope, and capacitor C 1 can filter the clutter of input.Resistance R 5 and capacitor C 2 are the RC time constant, set the size of output frequency.1 pin of U1 is a current output terminal, and electric current output is provided in the voltage-frequency transfer process, and electric current provides comparative voltage for 6 pin by resistance R 2.2 pin of U1 are the reference current output terminal, and the frequency after the 3 pin output conversion is given optocoupler U2.
The beneficial effects of the utility model are: by optocoupler DC circuit and control circuit are isolated, make and can not produce interference mutually between above-mentioned two circuit, make the antijamming capability of entire circuit strong, the measure linear degree is good, circuit stability and reliability all improve greatly.
Description of drawings
Fig. 1 is a kind of schematic block circuit diagram of the present utility model.
Fig. 2 is a kind of circuit theory diagrams of the present utility model.
1. DC voltage sampled signals among the figure, 2. voltage-frequency change-over circuit, 3. bleeder circuit, 4.DSP digital signal processing circuit.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment 1: a kind of dc voltage measurement circuit with isolation of present embodiment as shown in Figure 1 and Figure 2, comprises bleeder circuit 3, voltage-frequency change-over circuit 2, optocoupler U2, DSP digital signal processing circuit 4.Bleeder circuit 3 comprises continuous resistance R 1 and R8, and voltage-frequency change-over circuit 2 comprises voltage-frequency converter U1.Be parallel with stabilivolt Z1, capacitor C 1 on the resistance R 8, the end that resistance R 1 links to each other with R8 links to each other with 7 pin of voltage-frequency converter U1, another termination DC voltage sampled signal 1 of resistance R 1, the other end of resistance R 8 links to each other with 4 pin of voltage-frequency converter U1,4 pin of voltage-frequency converter U1 are through the parallel circuit of resistance R 3 connecting resistance R2 and electric capacity E1, the other end of this parallel circuit links to each other with 1 pin, 6 pin of voltage-frequency converter U1, the 4 pin ground connection of voltage-frequency converter U1; 3 pin of voltage-frequency converter U1 connect 2 pin of optocoupler U2, the 3 foot meridian capacitor C3 ground connection of while voltage-frequency converter U1,1 pin of optocoupler U2 meets voltage VDD through resistance R 6,8 pin of voltage-frequency converter U1 are through resistance R 5, capacitor C 2 ground connection, 8 pin of voltage-frequency converter U1 meet voltage VDD simultaneously, the tie point of resistance R 5 and capacitor C 2 links to each other with 5 pin of voltage-frequency converter U1, and 2 pin of voltage-frequency converter U1 are through resistance R 4 ground connection; The 3 pin ground connection of optocoupler U2,4 pin of optocoupler U2 meet voltage VCC through resistance R 7, and 4 pin of optocoupler U2 connect DSP digital signal processing circuit 4 simultaneously.
The course of work: the DC voltage sampled signal inputs to resistance R 1, after resistance R 1, R8 dividing potential drop, the voltage of dividing potential drop flows to 7 pin of voltage-frequency converter U1, frequency signal after the 3 pin output conversion of voltage-frequency converter U1 is given optocoupler U2, isolate through optocoupler U2, at last frequency signal is flowed to the DSP digital signal processing circuit.
The utility model is simple in structure, antijamming capability is strong, and the measure linear degree is good, and circuit stability and reliability all improve greatly.
Claims (2)
1. dc voltage measurement circuit with isolation, comprise the voltage-frequency change-over circuit (2) that links to each other with DC voltage sampled signal (1), it is characterized in that described DC voltage sampled signal (1) connects bleeder circuit (3), bleeder circuit (3) links to each other with the input end of described voltage-frequency change-over circuit (2) again, the input end of the output termination optocoupler U2 of voltage-frequency change-over circuit (2), the output termination DSP digital signal processing circuit (4) of optocoupler U2.
2. the dc voltage measurement circuit that band according to claim 1 is isolated, it is characterized in that described bleeder circuit (3) comprises continuous resistance R 1 and R8, be parallel with stabilivolt Z1 on the resistance R 8, capacitor C 1, described voltage-frequency change-over circuit (2) comprises voltage-frequency converter U1, the end that resistance R 1 links to each other with R8 links to each other with 7 pin of voltage-frequency converter U1, another termination DC voltage sampled signal (1) of resistance R 1, the other end of resistance R 8 links to each other with 4 pin of voltage-frequency converter U1,4 pin of voltage-frequency converter U1 are through the parallel circuit of resistance R 3 connecting resistance R2 and electric capacity E1,1 pin of the other end of this parallel circuit and voltage-frequency converter U1,6 pin link to each other, the 4 pin ground connection of voltage-frequency converter U1; 3 pin of voltage-frequency converter U1 connect 2 pin of optocoupler U2, the 3 foot meridian capacitor C3 ground connection of while voltage-frequency converter U1,1 pin of optocoupler U2 meets voltage VDD through resistance R 6,8 pin of voltage-frequency converter U1 are through resistance R 5, capacitor C 2 ground connection, 8 pin of voltage-frequency converter U1 meet voltage VDD simultaneously, the tie point of resistance R 5 and capacitor C 2 links to each other with 5 pin of voltage-frequency converter U1, and 2 pin of voltage-frequency converter U1 are through resistance R 4 ground connection; The 3 pin ground connection of optocoupler U2,4 pin of optocoupler U2 meet voltage VCC through resistance R 7, and 4 pin of optocoupler U2 connect described DSP digital signal processing circuit (4) simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820170814XU CN201331553Y (en) | 2008-12-22 | 2008-12-22 | DC (direct current) voltage measuring circuit with isolation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820170814XU CN201331553Y (en) | 2008-12-22 | 2008-12-22 | DC (direct current) voltage measuring circuit with isolation |
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| CN201331553Y true CN201331553Y (en) | 2009-10-21 |
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| CNU200820170814XU Expired - Fee Related CN201331553Y (en) | 2008-12-22 | 2008-12-22 | DC (direct current) voltage measuring circuit with isolation |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411083A (en) * | 2011-07-11 | 2012-04-11 | 泰州市海陵区双宇电子有限公司 | Direct current voltage sensor for automobile |
| CN102820881A (en) * | 2012-08-06 | 2012-12-12 | 深圳市汇川技术股份有限公司 | Analog voltage input circuit and method |
| CN102866278A (en) * | 2012-06-28 | 2013-01-09 | 深圳市汇川技术股份有限公司 | Output voltage detecting circuit for frequency changer and frequency changer |
| CN103424590A (en) * | 2012-05-15 | 2013-12-04 | 苏州工业园区新宏博通讯科技有限公司 | Voltage sampling circuit for automatic reclosing lock |
| CN103439556A (en) * | 2013-08-28 | 2013-12-11 | 深圳威迈斯电源有限公司 | Optical coupling isolation linear detection circuit and implementation method thereof |
| CN103884892A (en) * | 2012-12-20 | 2014-06-25 | 苏州工业园区新宏博通讯科技有限公司 | Direct current voltage isolation sampling circuit |
| CN105092933A (en) * | 2015-06-03 | 2015-11-25 | 大连市旅顺电力电子设备有限公司 | Direct switch type online voltage monitoring apparatus for storage battery and method thereof |
| CN105092954A (en) * | 2015-06-03 | 2015-11-25 | 大连市旅顺电力电子设备有限公司 | Novel online voltage monitoring apparatus for storage battery and method thereof |
| CN105158553A (en) * | 2015-08-28 | 2015-12-16 | 中国电子科技集团公司第十八研究所 | Voltage sampling circuit based on digital chip logic control AD574 |
| CN105486916A (en) * | 2015-11-16 | 2016-04-13 | 国家电网公司 | Direct current signal acquisition circuit facing intelligent transformer station |
| CN106018941A (en) * | 2016-05-23 | 2016-10-12 | 华中科技大学 | Pulse high-voltage measuring platform based on voltage-to-frequency conversion technology |
| CN107144728A (en) * | 2017-05-22 | 2017-09-08 | 合肥联信电源有限公司 | One kind concentrates battery-type emergency power supply inverter direct-current voltage sample circuit |
| CN108075730A (en) * | 2018-01-03 | 2018-05-25 | 深圳市华杰电气技术有限公司 | A kind of tension measuring circuit |
| CN108181494A (en) * | 2017-12-29 | 2018-06-19 | 浙江航都电子科技有限公司 | A kind of integrated infrared voltage P/T module |
| PL424028A1 (en) * | 2017-12-22 | 2019-07-01 | Instytut Tele- I Radiotechniczny | Method for supply voltage measurements |
| CN113193738A (en) * | 2021-05-08 | 2021-07-30 | 安徽佑赛科技股份有限公司 | High-voltage SVG power unit drive circuit |
-
2008
- 2008-12-22 CN CNU200820170814XU patent/CN201331553Y/en not_active Expired - Fee Related
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411083A (en) * | 2011-07-11 | 2012-04-11 | 泰州市海陵区双宇电子有限公司 | Direct current voltage sensor for automobile |
| CN103424590A (en) * | 2012-05-15 | 2013-12-04 | 苏州工业园区新宏博通讯科技有限公司 | Voltage sampling circuit for automatic reclosing lock |
| CN102866278A (en) * | 2012-06-28 | 2013-01-09 | 深圳市汇川技术股份有限公司 | Output voltage detecting circuit for frequency changer and frequency changer |
| CN102820881A (en) * | 2012-08-06 | 2012-12-12 | 深圳市汇川技术股份有限公司 | Analog voltage input circuit and method |
| CN103884892A (en) * | 2012-12-20 | 2014-06-25 | 苏州工业园区新宏博通讯科技有限公司 | Direct current voltage isolation sampling circuit |
| CN103439556A (en) * | 2013-08-28 | 2013-12-11 | 深圳威迈斯电源有限公司 | Optical coupling isolation linear detection circuit and implementation method thereof |
| CN105092933A (en) * | 2015-06-03 | 2015-11-25 | 大连市旅顺电力电子设备有限公司 | Direct switch type online voltage monitoring apparatus for storage battery and method thereof |
| CN105092954A (en) * | 2015-06-03 | 2015-11-25 | 大连市旅顺电力电子设备有限公司 | Novel online voltage monitoring apparatus for storage battery and method thereof |
| CN105092954B (en) * | 2015-06-03 | 2017-12-08 | 大连市旅顺电力电子设备有限公司 | New on-Line Voltage monitoring device and its method for batteries |
| CN105092933B (en) * | 2015-06-03 | 2017-12-12 | 大连市旅顺电力电子设备有限公司 | Direct transform on-Line Voltage monitoring device and its method for batteries |
| CN105158553A (en) * | 2015-08-28 | 2015-12-16 | 中国电子科技集团公司第十八研究所 | Voltage sampling circuit based on digital chip logic control AD574 |
| CN105158553B (en) * | 2015-08-28 | 2018-04-17 | 中国电子科技集团公司第十八研究所 | Voltage sampling circuit based on digit chip logic control AD574 |
| CN105486916A (en) * | 2015-11-16 | 2016-04-13 | 国家电网公司 | Direct current signal acquisition circuit facing intelligent transformer station |
| CN105486916B (en) * | 2015-11-16 | 2018-06-01 | 国家电网公司 | A kind of direct-current signal acquisition circuit towards intelligent substation |
| CN106018941A (en) * | 2016-05-23 | 2016-10-12 | 华中科技大学 | Pulse high-voltage measuring platform based on voltage-to-frequency conversion technology |
| CN106018941B (en) * | 2016-05-23 | 2019-01-29 | 华中科技大学 | A kind of high voltage pulse measuring table based on voltage-frequency switch technology |
| CN107144728A (en) * | 2017-05-22 | 2017-09-08 | 合肥联信电源有限公司 | One kind concentrates battery-type emergency power supply inverter direct-current voltage sample circuit |
| PL424028A1 (en) * | 2017-12-22 | 2019-07-01 | Instytut Tele- I Radiotechniczny | Method for supply voltage measurements |
| CN108181494A (en) * | 2017-12-29 | 2018-06-19 | 浙江航都电子科技有限公司 | A kind of integrated infrared voltage P/T module |
| CN108075730A (en) * | 2018-01-03 | 2018-05-25 | 深圳市华杰电气技术有限公司 | A kind of tension measuring circuit |
| CN113193738A (en) * | 2021-05-08 | 2021-07-30 | 安徽佑赛科技股份有限公司 | High-voltage SVG power unit drive circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Zhongchao Inventor after: Wang Zhengshi Inventor after: Li Yuling Inventor after: Li Xiaojun Inventor after: Wang Junjiang Inventor before: Zhang Zhongchao Inventor before: Wang Zhengren Inventor before: Li Yuling Inventor before: Li Xiaojun Inventor before: Wang Junjiang |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: ZHANG ZHONGCHAO; WANG ZHENGREN; LI YULING; LI XIAOJUN; WANG JUNJIANG TO: ZHANG ZHONGCHAO; WANG ZHENGSHI; LI YULING; LI XIAOJUN; WANG JUNJIANG |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091021 Termination date: 20101222 |