CN102230945B - High-voltage isolation direct-current voltage acquisition circuit - Google Patents
High-voltage isolation direct-current voltage acquisition circuit Download PDFInfo
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- CN102230945B CN102230945B CN201110098669.5A CN201110098669A CN102230945B CN 102230945 B CN102230945 B CN 102230945B CN 201110098669 A CN201110098669 A CN 201110098669A CN 102230945 B CN102230945 B CN 102230945B
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- 238000002955 isolation Methods 0.000 title claims abstract description 63
- 230000010354 integration Effects 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 238000012545 processing Methods 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims description 23
- 230000001681 protective effect Effects 0.000 claims description 9
- 230000001052 transient effect Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims 6
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- AWSBQWZZLBPUQH-UHFFFAOYSA-N mdat Chemical compound C1=C2CC(N)CCC2=CC2=C1OCO2 AWSBQWZZLBPUQH-UHFFFAOYSA-N 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000013519 translation Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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Abstract
The invention provides a high-voltage isolation direct-current voltage acquisition circuit. The high-voltage isolation direct-current voltage acquisition circuit comprises an input voltage division module which is connected in parallel with an anode and a cathode of high voltage to be tested and used for converting the high voltage to be tested into a low-voltage signal, an analog-to-digital isolation and conversion module for converting the low-voltage signal converted by the input voltage division module into a digital voltage signal, and a signal integration module for processing the digital signal converted by the analog-to-digital isolation and conversion module to acquire an analog voltage signal. The high-voltage isolation direct-current voltage acquisition circuit realizes physical isolation of high-voltage acquisition with low cost and has high anti-jamming capability, high reliability and an adjustable voltage acquisition measuring range.
Description
Technical field
The present invention relates to voltage acquisition technical field, relate in particular to a kind of high-voltage isolation direct-current voltage acquisition circuit.
Background technology
In many systems, all need to gather high-voltage dc voltage, but current high-voltage dc voltage Acquisition Circuit major part all exists reliability and precision is low or cost is high problem.
For example, describe as an example of the high-voltage dc voltage collection on motor controller of hybrid electric vehicle and controller for motor of pure electric vehicle example.The drive motor that hybrid vehicle and pure electric automobile adopt more than 80% be permagnetic synchronous motor, and DC bus-bar voltage collection technology on electric machine controller is one of necessary condition realizing magnetic control algolithm a little less than permagnetic synchronous motor low speed vector controlled and high speed.DC bus-bar voltage collection traditionally generally adopts the measures such as electric resistance partial pressure, capacitance partial pressure and the collection of voltage Hall.The feature of electric resistance partial pressure and capacitance partial pressure is simple in structure, cheap, shortcoming be directly by noble potential without introducing isolator acquisition system, poor safety performance and can cause Conduction Interference to motor driven systems; The advantage of voltage Hall collection is that collection response is fast, precision is high, high pressure isolation, but cost is high and also need additionally to provide dual power supply.
Summary of the invention
In order to address the above problem, the invention provides a kind of good reliability, precision is high, cost is low high-voltage isolation direct-current voltage acquisition circuit.
In order to realize above object, high-voltage isolation direct-current voltage acquisition circuit provided by the invention comprises: input division module, and it is connected in parallel between the positive pole and negative pole of tested high pressure, for described tested high pressure is converted to low voltage signal; Modulus isolation modular converter, it is for being converted to digital quantity voltage signal by the low voltage signal of input division module conversion; With signal integration module, it is for being treated to analog quantity voltage signal by the digital quantity signal of isolating modular converter conversion by modulus.
Preferably, described input division module is the resistor voltage divider circuit being made up of multiple resistance.
Preferably, described modulus isolation modular converter comprises magnetic isolation operational amplifier or the even isolation of light operational amplifier.
Preferably, described signal integration module is the integrating circuit being made up of resistance and electric capacity.
Preferably, described circuit also comprises: filtering current limliting module, and it is for carrying out filtering current limliting to the low voltage signal of changing by input division module; And overvoltage protective module, it is for preventing that the voltage that is input to modulus isolation modular converter is higher than predetermined value.
Preferably, described filtering current limliting module is the π type filtering circuit being made up of resistance and electric capacity.
Preferably, described overvoltage protective module is transient voltage suppressor diode.
Preferably, described circuit also comprises: export ratio adjustment module, it does voltage follow, scale operation and filtering processing for the analog quantity voltage signal to by signal integration resume module.
Preferably, described export ratio adjustment module comprises the subtraction and the scale operation circuit that are made up of operational amplifier, resistance and electric capacity.
High-voltage dc voltage Acquisition Circuit of the present invention realizes high pressure with low cost and gathers physical isolation, and antijamming capability is strong, reliability is high, it is adjustable to gather voltage range scope.
Brief description of the drawings
Fig. 1 is the structural representation of high-voltage isolation direct-current voltage acquisition circuit of the present invention;
Fig. 2 is the preferred structure schematic diagram of high-voltage isolation direct-current voltage acquisition circuit of the present invention;
Fig. 3 is the partial circuit figure of the high-voltage isolation direct-current voltage acquisition circuit of one embodiment of the present of invention;
Fig. 4 is another part circuit diagram of high-voltage isolation direct-current voltage acquisition circuit shown in Fig. 3.
Embodiment
Below, present invention is described with embodiment with reference to the accompanying drawings.
Fig. 1 is the structural representation of high-voltage isolation direct-current voltage acquisition circuit of the present invention.As shown in Figure 1, this high-voltage isolation direct-current voltage acquisition circuit comprises input division module 10, modulus isolation modular converter 20 and signal integration module 30.Wherein, input division module 10 is connected in parallel between the positive pole and negative pole of tested high pressure (POWER_VCC), for tested high pressure is converted to low voltage signal.Input division module 10 can be the resistor voltage divider circuit being for example made up of multiple resistance.Modulus isolation modular converter 20 is for being converted to digital quantity voltage signal by the low voltage signal of changing by input division module 10.Modulus isolation modular converter 20 can comprise for example magnetic isolation operational amplifier or the even isolation of light operational amplifier.Signal integration module 30 is for being treated to analog quantity voltage signal by isolate the digital quantity voltage signal that modular converter 20 changes by modulus.Signal integration module 30 can be the integrating circuit being for example made up of resistance and electric capacity.By sort circuit structure, can realize high pressure and gather physical isolation, and these modules all can adopt general components and parts (resistance and electric capacity) to realize, therefore, cheap.
In addition, in order to realize the high reliability of high pressure Acquisition Circuit, as shown in Figure 2, high-voltage isolation direct-current voltage acquisition circuit of the present invention also can comprise the filtering current limliting module 40 and the overvoltage protective module 50 that are connected between input division module 10 and modulus isolation modular converter 20, wherein, filtering current limliting module 40, for the low voltage signal of changing by input division module 10 is carried out to filtering current limliting, can be the π type filtering circuit being for example made up of resistance and electric capacity; Overvoltage protective module 50 is for preventing that the voltage that is input to modulus isolation modular converter 20 from, higher than predetermined value, can be that for example transient voltage suppresses (TVS) diode.
In addition, in order to realize the adjustable function of output voltage range, as shown in Figure 2, high-voltage isolation direct-current voltage acquisition circuit of the present invention also can comprise the export ratio adjustment module 60 being connected with signal integration module 30, does voltage follow, scale operation and filtering processing for the analog quantity voltage signal to processing by signal integration module 30.Export ratio adjustment module 60 can comprise the subtraction and the scale operation circuit that are made up of operational amplifier, resistance and electric capacity.
Fig. 3 is the partial circuit figure of the high-voltage isolation direct-current voltage acquisition circuit of one embodiment of the present of invention, and Fig. 4 is another part circuit diagram of high-voltage isolation direct-current voltage acquisition circuit shown in Fig. 3.
As shown in Figure 3, the resistor voltage divider circuit of input division module 10 for being made up of precision resistance R1, R2, R3, R4, R5, R6, R7, R8, for being converted to low voltage signal by tested high pressure P OWER VCC.
The π type filtering circuit of filtering current limliting module 40 for being made up of R9, R10, R11, C1, C2, for carrying out filtering and current limliting to the low voltage signal of changing by input division module 10.
Overvoltage protective module 50 is a TVS diode D1, for example, for preventing that the voltage that is input to modulus isolation modular converter 20 is higher than predetermined value, 5V.
Modulus isolation modular converter 20 comprises U1, and (be AD7400, chip DATASHEET details are visible
www.analog.com), C3, C4, wherein, U1 is AD7400, there is the modulus isolation translation function of magnetic isolation method, specifically, it is on high-tension side voltage signal is converted to the digital quantity voltage signal output of one 16 by the magnetic isolation method of its chip internal, thereby reaches the object of high pressure isolation detection.
As shown in Figure 4, signal integration module 30 integrating circuit for being made up of R12, C5, for isolating digital quantity voltage signal that modular converter 20 changes and be treated to the analog quantity voltage signal of a linearity by modulus.Here point out 11 pins (MDAT) of the U1 in right-hand end sub-connection Fig. 3 of R12.
Export ratio adjustment module 60 comprises R13, R14, R15, R16, R17, R18, C6, C7, C8, U2, and (be AD8552, chip DATASHEET details are visible
www.analog.com), wherein, R13, R16, R17, R18, U2 proportion of composing computing circuit, be adjusted to output signal to need scope; R14, R15, U2 form voltage follower circuit, determine the voltage reference of output signal; C6 and C7 are as signal filtering, and C8 is as chip power supply power decoupling.
The output range of adjustment of export ratio adjustment module 60 be 0 to
wherein, V
2for the output of signal integration module 30.Once digital-to-analogue isolation modular converter 20 and signal integration module 30 are determined, V
2value just can be determined.
Shown in Fig. 3 and Fig. 4, the principle of work of circuit is as follows: tested high pressure P OWER VCC is converted to a low voltage signal by input division module 10, this voltage signal after filtering current limliting module 40 and overvoltage protective module 50 is input to VIN+ and the VIN-pin of U1, modulus isolation translation function by this chip is exported the digital quantity signal of one 16 by MDAT pin, this digital quantity signal is treated to the analog signals of a linearity by signal integration module 30, then by export ratio adjustment module 60, this signal is made to voltage follow, scale operation and filtering processing, finally obtain VDO output.This circuit has just completed the linear isolation of high input voltage (POWER VCC) with low pressure output (VDO) like this.
In this circuit, can be by changing the resistance of R1, R2, R3, R4, R5, R6, R7, R8, do any change in the one-piece construction to circuit not, make it be applicable to different high-tension measurement grades, that is, and adjustable collection voltage range scope.
Specifically, input division module 10 voltage range scope be 0 to
wherein, V
1for the input full scale value of digital-to-analogue isolation modular converter 20.Once digital-to-analogue isolation modular converter 20 is determined, V
1value is just determined.
Can find out from circuit shown in Fig. 3 and Fig. 4; all modules in high-voltage isolation direct-current voltage acquisition circuit of the present invention all can adopt general components and parts to realize; thereby can realize with low cost the linear isolation of high input voltage and low pressure output; antijamming capability is strong, reliability is high, but also has the advantage such as self-protection function and the adjusting of output signal ratio.
Here point out, as mentioned above, filtering current limliting module 40, overvoltage protective module 50 and export ratio adjustment module 60 are optional modules, and in the situation that there is no these modules, DC voltage Acquisition Circuit of the present invention can realize high pressure and gather physical isolation function.
Below with reference to drawings and Examples, the present invention be have been described in detail; but; should be appreciated that; high-voltage isolation direct-current voltage acquisition circuit of the present invention is not limited to above disclosed specific embodiment, and any modification based on the disclosed technical scheme of this instructions all should be included in protection scope of the present invention.
Claims (7)
1. a high-voltage isolation direct-current voltage acquisition circuit, comprising:
Input division module, it is connected in parallel between the positive pole and negative pole of tested high pressure, for described tested high pressure is converted to low voltage signal;
Modulus isolation modular converter, it is for being converted to digital quantity voltage signal by the low voltage signal of input division module conversion;
Signal integration module, it is for being treated to analog quantity voltage signal by the digital quantity voltage signal of isolating modular converter conversion by modulus; With
Export ratio adjustment module, it does voltage follow, scale operation and filtering processing for the analog quantity voltage signal to by signal integration resume module;
Described export ratio adjustment module comprises resistance R 13, resistance R 14, resistance R 15, resistance R 16, resistance R 17, resistance R 18, capacitor C 6, capacitor C 7, capacitor C 8, operational amplifier U2, wherein, resistance R 13, resistance R 16, resistance R 17, resistance R 18, operational amplifier U2 proportion of composing computing circuit, output signal is adjusted to and needs scope, the pin 3 of described resistance R 13 concatenation operation amplifier U2, the two ends of described resistance R 16 are pin 3 and the ground of concatenation operation amplifier U2 respectively, the two ends of described resistance R 17 are pin 1 and the pin 2 of concatenation operation amplifier U2 respectively, the two ends of described resistance R 18 are pin 7 and the pin 2 of concatenation operation amplifier U2 respectively, described operational amplifier U2 adopts AD8552, resistance R 14, resistance R 15, described operational amplifier U2 form voltage follower circuit, determine the voltage reference of output signal, described resistance R 14 and resistance R 15 are connected, and the pin 5 of its series connection node concatenation operation amplifier U2, non-series connection node one end of described resistance R 14 connects 5V voltage, non-series connection node one end ground connection of described resistance R 15, capacitor C 6 and capacitor C 7 are as signal filtering, and capacitor C 8 is as chip power supply power decoupling,
The output signal range of adjustment of described export ratio adjustment module be 0 to
wherein, V
2for the output voltage of signal integration module, 5 is the 5V voltage of non-series connection node one end connection of described resistance R 14.
2. high-voltage isolation direct-current voltage acquisition circuit according to claim 1, is characterized in that, described input division module is the resistor voltage divider circuit being made up of multiple resistance.
3. high-voltage isolation direct-current voltage acquisition circuit according to claim 1, is characterized in that, described modulus isolation modular converter comprises magnetic isolation operational amplifier or the even isolation of light operational amplifier.
4. high-voltage isolation direct-current voltage acquisition circuit according to claim 1, is characterized in that, described signal integration module is the integrating circuit being made up of resistance and electric capacity.
5. high-voltage isolation direct-current voltage acquisition circuit according to claim 1, is characterized in that, described circuit also comprises:
Filtering current limliting module, it is for carrying out filtering current limliting to the low voltage signal of changing by input division module; With
Overvoltage protective module, it is for preventing that the voltage that is input to modulus isolation modular converter is higher than predetermined value.
6. high-voltage isolation direct-current voltage acquisition circuit according to claim 5, is characterized in that, described filtering current limliting module is the π type filtering circuit being made up of resistance and electric capacity.
7. high-voltage isolation direct-current voltage acquisition circuit according to claim 5, is characterized in that, described overvoltage protective module is transient voltage suppressor diode.
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| CN201110098669.5A CN102230945B (en) | 2011-04-15 | 2011-04-15 | High-voltage isolation direct-current voltage acquisition circuit |
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| CN201110098669.5A CN102230945B (en) | 2011-04-15 | 2011-04-15 | High-voltage isolation direct-current voltage acquisition circuit |
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| CN102230945B true CN102230945B (en) | 2014-06-11 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102650894B (en) * | 2012-04-24 | 2016-01-20 | 杭州临安博达电源有限公司 | A kind of voltage collection circuit for battery management system |
| CN102710248A (en) * | 2012-05-21 | 2012-10-03 | 奇瑞汽车股份有限公司 | Isolated voltage acquisition circuit |
| 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 |
| CN104635175A (en) * | 2013-11-13 | 2015-05-20 | 中国科学院沈阳计算技术研究所有限公司 | High-voltage direct current monitoring system and monitoring method thereof |
| CN105759675A (en) * | 2014-12-19 | 2016-07-13 | 中车大连电力牵引研发中心有限公司 | Analog quantity input board card and analog quantity acquisition method |
| CN105044422A (en) * | 2015-07-10 | 2015-11-11 | 深圳市航盛电子股份有限公司 | Liner signal high precision isolation circuit and linear signal high precision isolation circuit collection method |
| 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 |
| CN108664439B (en) * | 2018-05-15 | 2021-10-15 | 北京机械设备研究所 | Analog quantity output circuit device with digital isolation |
| CN110726868B (en) * | 2019-11-08 | 2024-06-11 | 中国船舶重工集团公司第七一九研究所 | Isolated direct-current electric quantity acquisition and switching value control circuit |
| CN114545297A (en) * | 2022-02-25 | 2022-05-27 | 山东浪潮科学研究院有限公司 | Quantum measurement and control equipment connection monitoring device |
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| CN201335857Y (en) * | 2008-12-26 | 2009-10-28 | 中国西电电气股份有限公司 | Voltage sensor for high-voltage DC transmission |
| CN101873075A (en) * | 2010-07-02 | 2010-10-27 | 深圳市四方电气技术有限公司 | Collecting circuit for direct current bus |
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| CN2600819Y (en) * | 2002-09-22 | 2004-01-21 | 西安高压电器研究所 | Device for measuring voltage and current of high-tension switch equipment |
| CN201589806U (en) * | 2009-12-10 | 2010-09-22 | 厦门科华恒盛股份有限公司 | Direct current isolation sampling device |
| CN201656952U (en) * | 2010-02-10 | 2010-11-24 | 中国轻工业广州设计工程有限公司 | Sampling isolation circuit for analog signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201335857Y (en) * | 2008-12-26 | 2009-10-28 | 中国西电电气股份有限公司 | Voltage sensor for high-voltage DC transmission |
| CN101873075A (en) * | 2010-07-02 | 2010-10-27 | 深圳市四方电气技术有限公司 | Collecting circuit for direct current bus |
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Owner name: CHERY NEW ENERGY AUTOMOBILE TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SAIC CHERY AUTOMOBILE CO., LTD. Effective date: 20150722 |
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Effective date of registration: 20150722 Address after: 241000 Yijiang, Anhui Province, Jin Hua Road, No. 226, South Road, No. Patentee after: New-energy automobile Technology Co., Ltd. of Cherry Address before: 241006 Wuhu economic and Technological Development Zone, Anhui, No. 8 Changchun Road Patentee before: Saic Chery Automobile Co., Ltd. Effective date of registration: 20150722 Address after: 241000 Yijiang, Anhui Province, Jin Hua Road, No. 226, South Road, No. Patentee after: New-energy automobile Technology Co., Ltd. of Cherry Address before: 241006 Wuhu economic and Technological Development Zone, Anhui, No. 8 Changchun Road Patentee before: Saic Chery Automobile Co., Ltd. |
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Address after: 241000 No. 226 Jin Hua Nan Road, Yijiang hi tech Industrial Development Zone, Anhui, Wuhu Patentee after: Chery New Energy Automobile Co.,Ltd. Address before: 241000 No. 226 Hua Jin South Road, Yijiang District, Anhui, Wuhu Patentee before: CHERY NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. |
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