CN203658440U - High-precision high voltage isolation operational amplifier detection circuit - Google Patents
High-precision high voltage isolation operational amplifier detection circuit Download PDFInfo
- Publication number
- CN203658440U CN203658440U CN201320759056.6U CN201320759056U CN203658440U CN 203658440 U CN203658440 U CN 203658440U CN 201320759056 U CN201320759056 U CN 201320759056U CN 203658440 U CN203658440 U CN 203658440U
- Authority
- CN
- China
- Prior art keywords
- module
- voltage
- electrically connected
- resistance
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000002955 isolation Methods 0.000 title claims abstract description 48
- 238000001514 detection method Methods 0.000 title abstract description 13
- 230000003139 buffering effect Effects 0.000 claims abstract description 24
- 238000005070 sampling Methods 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims description 28
- 238000012545 processing Methods 0.000 claims description 18
- 230000003321 amplification Effects 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 15
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 15
- 238000004886 process control Methods 0.000 abstract 4
- 239000003990 capacitor Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses a high-precision high voltage isolation operational amplifier detection circuit. The detection circuit comprises a series connection step-down module, a voltage limiting protection module, a differential amplifier module, a buffer isolation module, a filter voltage limiting module and a process control module; the voltage limiting protection module and the differential amplifier module are sequentially electrically connected between the series connection step-down module and the buffer isolation module; a sampling signal on the buffer isolation module through the filter voltage limiting module is transmitted to the process control module; and the process control module is provided with an AD sampler. In the utility model, P and N input high voltage signal source voltages of the frequency inverter are reduced by the series connection step-down module, are operated with the high resistance isolation by the voltage limiting protection module, are reduced with the operational amplifier by the differential amplifier module, and then are connected with the buffer isolation module for buffering and isolating; the sampling signal on the buffer isolation module is processed and sent to the process control module so as to carry out the AD sampling, and various kinds of under / overvoltage protection are realized; and the circuit is high in detection precision, good in linearity and timely in protection.
Description
Technical field
The utility model relates to field of power electronics, relates in particular to a kind of high-precision high voltage isolation amplifier testing circuit.
Background technology
At present, the detection of most of frequency converter PN DC bus-bar voltage is to adopt switch transformer Secondary Winding voltage detecting scheme, adopts the transformer of this scheme to detect to exist the defects such as time delay, poor linearity, reliability be low.In the time that input voltage alters a great deal, actually detect that voltage exists larger deviation, cannot reliably realize in time protection, cause frequency converter to occur the phenomenon such as burning because of under-voltage out of service or superpotential.
Utility model content
For the weak point existing in above-mentioned technology, the utility model provides that a kind of accuracy of detection is high, the linearity good, the response time is fast and circuit protection high-precision high voltage isolation amplifier testing circuit timely.
For achieving the above object, the utility model provides a kind of high-precision high voltage isolation amplifier testing circuit, comprises series connection voltage reduction module, voltage-limiting protection module, differential amplification module, buffering isolation module, filtering pressure limiting module and processing and control module for connecting PN input high-voltage signal source; Between described series connection voltage reduction module and buffering isolation module, be electrically connected with successively voltage-limiting protection module and differential amplification module, the sampled signal on described buffering isolation module transfers to processing and control module by filtering pressure limiting module; Described processing and control module is provided with AD sampling thief.
Wherein, described testing circuit also comprises first integral feedback module and second integral feedback module; Described first integral feedback module and second integral feedback module are electrically connected with differential amplification module respectively.
Wherein, described series connection voltage reduction module comprises the first resistance and second resistance of series connection, and one end of described the first resistance is electrically connected with N input high-voltage signal source, and one end of described the second resistance is electrically connected with P input high-voltage signal source.
Wherein, described voltage-limiting protection module comprises the first diode, the second diode, the 3rd diode and the 4th diode; The common port of described the first diode and the second diode is electrically connected with the other end of the first resistance, and the common port of described the 3rd diode and the 4th diode is electrically connected with the other end of the second resistance.
Wherein, described differential amplification module is differential amplifier; The other end of described the first resistance is also electrically connected with the inverting input of differential amplifier, and the other end of described the second resistance is also electrically connected with the in-phase input end of differential amplifier, and the output terminal of described differential amplifier is electrically connected with buffering isolation module.
Wherein, described buffering isolation module is voltage-tracing device, the in-phase input end of described voltage-tracing device is electrically connected with the output terminal of differential amplifier by the 3rd resistance, and the common port forming after the inverting input of described voltage-tracing device is electrically connected with the output terminal of voltage-tracing device is electrically connected with filtering pressure limiting module.
Wherein, described filtering pressure limiting module comprises the first electric capacity, the 4th resistance, the 5th diode and the 6th diode; The common port forming after the inverting input of described voltage-tracing device is electrically connected with the output terminal of voltage-tracing device is electrically connected with one end of the 4th resistance, one end ground connection of described the first electric capacity, ground connection after the 5th diode that described the 6th diode passes through to connect, is electrically connected to processing and control module after the common port of the common port of described the first electric capacity and the 3rd resistance by the 5th diode and the 6th diode.
Wherein, described first integral feedback module comprises the second electric capacity and the 5th resistance; After described the second electric capacity and the 5th resistance parallel connection, be electrically connected with the in-phase input end of differential amplifier.
Wherein, described second integral feedback module comprises the 3rd electric capacity and the 6th resistance, after described the 3rd electric capacity and the 6th resistance parallel connection, is connected electrically between the inverting input of differential amplifier and the output terminal of differential amplifier.
Wherein, described processing and control module is dsp chip.
The beneficial effects of the utility model are: compared with prior art; the high-precision high voltage isolation amplifier testing circuit that the utility model provides; frequency converter PN input high-voltage signal source voltage is after the step-down of series connection voltage reduction module; by voltage-limiting protection module carry out high-barrier from; recycling differential amplification module amplifier isolated buck; connect afterwards buffering isolation module and play buffering and buffer action, finally buffering, the sampled signal on isolation module is delivered to after treatment and in processing and control module, is carried out AD sampling and realize the work of various owing/overvoltage protection.In the time that input voltage alters a great deal, this testing circuit detection error realize in time reliably protection in time, and this testing circuit has that accuracy of detection is high, the linearity good, the response time is fast, highly sensitive and protect the features such as timely.
Brief description of the drawings
Fig. 1 is the working envelope figure of high-precision high voltage isolation amplifier testing circuit of the present utility model;
Fig. 2 is the fundamental diagram of high-precision high voltage isolation amplifier testing circuit of the present utility model;
Fig. 3 is the oscillogram of the first experimental group PN DC bus-bar voltage in the utility model;
Fig. 4 is the oscillogram of the first experimental group DSP chip detection voltage wave in the utility model;
Fig. 5 is the oscillogram of the second experimental group PN DC bus-bar voltage overvoltage in the utility model;
Fig. 6 is that in the utility model, the second experimental group dsp chip detects reaction time oscillogram;
Fig. 7 is the under-voltage oscillogram of the second experimental group PN DC bus-bar voltage in the utility model;
Fig. 8 is that in the utility model, the second experimental group dsp chip detects reaction time oscillogram.
Main element symbol description is as follows:
10, series connection voltage reduction module 11, voltage-limiting protection module
12, differential amplification module 13, buffering isolation module
14, filtering pressure limiting module 15, processing and control module
16, first integral feedback module 17, second integral feedback module
Embodiment
In order more clearly to explain the utility model, below in conjunction with accompanying drawing, the utility model is further described.
Refer to Fig. 1-2, high-precision high voltage isolation amplifier testing circuit of the present utility model, comprises series connection voltage reduction module 10, voltage-limiting protection module 11, differential amplification module 12, buffering isolation module 13, filtering pressure limiting module 14 and processing and control module 15 for connecting PN input high-voltage signal source; Between series connection voltage reduction module 10 and buffering isolation module 13, be electrically connected with successively voltage-limiting protection module 11 and differential amplification module 12, the sampled signal on buffering isolation module 13 transfers to processing and control module 15 by filtering pressure limiting module 14; Processing and control module 15 is provided with AD sampling thief.By AD sampling thief, sampled signal is carried out to AD sampling.
Compared to the situation of prior art; the high-precision high voltage isolation amplifier testing circuit that the utility model provides; frequency converter PN input high-voltage signal source voltage is after 10 step-downs of series connection voltage reduction module; by voltage-limiting protection module 11 carry out high-barrier from; recycling differential amplification module 12 amplifier isolated bucks; connect afterwards 13 of isolation modules of buffering buffering and buffer action, finally the sampled signal on buffering isolation module 13 is delivered to after treatment and in processing and control module 15, carried out AD sampling and realize the work of various owing/overvoltage protection.In the time that input voltage alters a great deal, this testing circuit detection error realize in time reliably protection in time, and this testing circuit has that accuracy of detection is high, the linearity good, the response time is fast, highly sensitive and protect the features such as timely.
In the present embodiment, series connection voltage reduction module 10 comprises that the first resistance R 1 of series connection and one end of the second resistance R 2, the first resistance R 1 are electrically connected with N input high-voltage signal source, and one end of the second resistance R 2 is electrically connected with P input high-voltage signal source.Voltage-limiting protection module 11 comprises the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4; The common port of the first diode D1 and the second diode D2 is electrically connected with the other end of the first resistance R 1, and the common port of the 3rd diode D3 and the 4th diode D4 is electrically connected with the other end of the second resistance R 2.Differential amplification module 12 is differential amplifier U1; The other end of the first resistance R 1 is also electrically connected with the inverting input of differential amplifier U1, and the other end of the second resistance R 2 is also electrically connected with the in-phase input end of differential amplifier U1, and the output terminal of differential amplifier U1 is electrically connected with buffering isolation module 13.Buffering isolation module 13 is voltage-tracing device U2, the in-phase input end of voltage-tracing device U2 is electrically connected with the output terminal of differential amplifier U1 by the 3rd resistance R 3, and the common port forming after the inverting input of voltage-tracing device U2 is electrically connected with the output terminal of voltage-tracing device U2 is electrically connected with filtering pressure limiting module 14.Filtering pressure limiting module 14 comprises the first capacitor C 1, the 4th resistance R 4, the 5th diode D5 and the 6th diode D6; The common port forming after the inverting input of voltage-tracing device U2 is electrically connected with the output terminal of voltage-tracing device U2 is electrically connected with one end of the 4th resistance R 4, one end ground connection of the first capacitor C 1, ground connection after the 5th diode D5 that the 6th diode D6 passes through to connect, is electrically connected to processing and control module 15 after the common port of the common port of the first capacitor C 1 and the 3rd resistance R 3 by the 5th diode D5 and the 6th diode D6.Processing and control module 15 is dsp chip; the sampled signal that buffering isolation module 13 is exported is sent into dsp chip and is carried out AD sampling by AD sampling thief AC-DC after the first capacitor C 1 and the 4th resistance R 4 first-order filterings and the 5th diode D5 and the 6th diode D6 clamper, and realizes various protective effects.
In the present embodiment, testing circuit also comprises first integral feedback module 16 and second integral feedback module 17; First integral feedback module 16 and second integral feedback module 17 are electrically connected with differential amplification module 12 respectively, and first integral feedback module 16 and second integral feedback module 17 are ensureing under the prerequisite of enlargement factor, can filtering interfering increase high frequency response.First integral feedback module 16 comprises the second capacitor C 2 and the 5th resistance R 5; After the second capacitor C 2 and the 5th resistance R 5 are in parallel, be electrically connected with the in-phase input end of differential amplifier U1.Second integral feedback module 17 is connected electrically between the inverting input of differential amplifier U1 and the output terminal of differential amplifier U1 after comprising the 3rd capacitor C 3 and the 6th resistance R 6, the three capacitor C 3 and the 6th resistance R 6 parallel connections.
Frequency converter, in the process of work, adopts testing circuit of the present utility model, and experiment records PN DC bus-bar voltage and DSP AD detection voltage is as follows:
| PN DC bus-bar voltage | DC340V | DC440V | DC540V | DC640V | DC740V |
| DSP AD detects voltage | DC1.13V | DC1.47V | DC1.81V | DC2.13V | DC2.47V |
As shown in Figure 3, the variation oscillogram of DSP AD detection voltage as shown in Figure 4 for the variation oscillogram of PN DC bus-bar voltage.Here DSP AD refers to the AD sampling thief AC-DC of dsp chip, is simply written as DSP AD, as follows.
Can obtain as drawn a conclusion by above-mentioned form and oscillogram: 1) this electric circuit inspection precision is high, and the linearity is good, and the response time is fast; 2) circuit protection is timely, avoids fault extension.
Please further consult Fig. 5-8, the utility model is applied in AC70 series main power board, and test performance is good, uses reliable in actual job site.Figure below 5-8 is owe/overvoltage protection of this Series P N DC bus-bar voltage waveform, from four oscillograms, can learn, in the time that PN DC bus-bar voltage reaches the threshold voltage of owe/overvoltage, signal is delivered to and in DSP, is carried out A/D sampling and realize the work of owe/overvoltage protection.
Disclosed is above only several specific embodiment of the present utility model, but the utility model is not limited thereto, and the changes that any person skilled in the art can think of all should fall into protection domain of the present utility model.
Claims (10)
1. a high-precision high voltage isolation amplifier testing circuit, is characterized in that, comprises series connection voltage reduction module, voltage-limiting protection module, differential amplification module, buffering isolation module, filtering pressure limiting module and processing and control module for connecting PN input high-voltage signal source; Between described series connection voltage reduction module and buffering isolation module, be electrically connected with successively voltage-limiting protection module and differential amplification module, the sampled signal on described buffering isolation module transfers to processing and control module by filtering pressure limiting module; Described processing and control module is provided with AD sampling thief.
2. high-precision high voltage isolation amplifier testing circuit according to claim 1, is characterized in that, described testing circuit also comprises first integral feedback module and second integral feedback module; Described first integral feedback module and second integral feedback module are electrically connected with differential amplification module respectively.
3. high-precision high voltage isolation amplifier testing circuit according to claim 2, it is characterized in that, described series connection voltage reduction module comprises the first resistance and second resistance of series connection, one end of described the first resistance is electrically connected with N input high-voltage signal source, and one end of described the second resistance is electrically connected with P input high-voltage signal source.
4. high-precision high voltage isolation amplifier testing circuit according to claim 3, is characterized in that, described voltage-limiting protection module comprises the first diode, the second diode, the 3rd diode and the 4th diode; The common port of described the first diode and the second diode is electrically connected with the other end of the first resistance, and the common port of described the 3rd diode and the 4th diode is electrically connected with the other end of the second resistance.
5. high-precision high voltage isolation amplifier testing circuit according to claim 4, is characterized in that, described differential amplification module is differential amplifier; The other end of described the first resistance is also electrically connected with the inverting input of differential amplifier, and the other end of described the second resistance is also electrically connected with the in-phase input end of differential amplifier, and the output terminal of described differential amplifier is electrically connected with buffering isolation module.
6. high-precision high voltage isolation amplifier testing circuit according to claim 5, it is characterized in that, described buffering isolation module is voltage-tracing device, the in-phase input end of described voltage-tracing device is electrically connected with the output terminal of differential amplifier by the 3rd resistance, and the common port forming after the inverting input of described voltage-tracing device is electrically connected with the output terminal of voltage-tracing device is electrically connected with filtering pressure limiting module.
7. high-precision high voltage isolation amplifier testing circuit according to claim 6, is characterized in that, described filtering pressure limiting module comprises the first electric capacity, the 4th resistance, the 5th diode and the 6th diode; The common port forming after the inverting input of described voltage-tracing device is electrically connected with the output terminal of voltage-tracing device is electrically connected with one end of the 4th resistance, one end ground connection of described the first electric capacity, ground connection after the 5th diode that described the 6th diode passes through to connect, is electrically connected to processing and control module after the common port of the common port of described the first electric capacity and the 3rd resistance by the 5th diode and the 6th diode.
8. high-precision high voltage isolation amplifier testing circuit according to claim 7, is characterized in that, described first integral feedback module comprises the second electric capacity and the 5th resistance; After described the second electric capacity and the 5th resistance parallel connection, be electrically connected with the in-phase input end of differential amplifier.
9. high-precision high voltage isolation amplifier testing circuit according to claim 7, it is characterized in that, described second integral feedback module comprises the 3rd electric capacity and the 6th resistance, after described the 3rd electric capacity and the 6th resistance parallel connection, is connected electrically between the inverting input of differential amplifier and the output terminal of differential amplifier.
10. according to the high-precision high voltage isolation amplifier testing circuit described in claim 1 or 7, it is characterized in that, described processing and control module is dsp chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320759056.6U CN203658440U (en) | 2013-11-27 | 2013-11-27 | High-precision high voltage isolation operational amplifier detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320759056.6U CN203658440U (en) | 2013-11-27 | 2013-11-27 | High-precision high voltage isolation operational amplifier detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203658440U true CN203658440U (en) | 2014-06-18 |
Family
ID=50924815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320759056.6U Expired - Lifetime CN203658440U (en) | 2013-11-27 | 2013-11-27 | High-precision high voltage isolation operational amplifier detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203658440U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108288870A (en) * | 2018-02-24 | 2018-07-17 | 数源科技股份有限公司 | A kind of linear electrical isolation circuit system |
| CN108540133A (en) * | 2018-03-09 | 2018-09-14 | 徐晨旭 | A kind of implementation method and device of multi-functional amplifier sampling front-end circuit |
| CN109324218A (en) * | 2017-07-31 | 2019-02-12 | 株洲变流技术国家工程研究中心有限公司 | A kind of capacitance partial pressure DC bus partial pressure state detection circuit |
| CN113189468A (en) * | 2021-05-13 | 2021-07-30 | 中国工程物理研究院电子工程研究所 | Health state on-line monitoring circuit and system of power device |
-
2013
- 2013-11-27 CN CN201320759056.6U patent/CN203658440U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109324218A (en) * | 2017-07-31 | 2019-02-12 | 株洲变流技术国家工程研究中心有限公司 | A kind of capacitance partial pressure DC bus partial pressure state detection circuit |
| CN109324218B (en) * | 2017-07-31 | 2021-05-07 | 株洲变流技术国家工程研究中心有限公司 | Capacitance voltage division direct current bus voltage division state detection circuit |
| CN108288870A (en) * | 2018-02-24 | 2018-07-17 | 数源科技股份有限公司 | A kind of linear electrical isolation circuit system |
| CN108540133A (en) * | 2018-03-09 | 2018-09-14 | 徐晨旭 | A kind of implementation method and device of multi-functional amplifier sampling front-end circuit |
| CN113189468A (en) * | 2021-05-13 | 2021-07-30 | 中国工程物理研究院电子工程研究所 | Health state on-line monitoring circuit and system of power device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203658440U (en) | High-precision high voltage isolation operational amplifier detection circuit | |
| CN105137292B (en) | Direct current signal intelligent acquisition device for high-tension cable fault location | |
| CN105939148B (en) | Photovoltaic cell monitoring device | |
| CN103795054A (en) | Lightning protection system and method of direct-current remote supply power equipment | |
| CN103884900A (en) | Device and method for detecting voltages of direct current bus of variable frequency speed regulator | |
| CN105048428A (en) | Protective circuit for analog input ports | |
| CN204794059U (en) | Protection circuit of analog input port | |
| CN203759094U (en) | Direct-current bus voltage detection circuit of variable-frequency speed governor | |
| CN203759091U (en) | Input voltage detection circuit | |
| CN201860313U (en) | Signal isolation interface | |
| CN203965527U (en) | A kind of electrostatic admeasuring apparatus | |
| CN103149408B (en) | Microcomputer protection device and current sampling circuit thereof | |
| CN202586732U (en) | Open-phase protection circuit of frequency converter | |
| CN202794285U (en) | Isolation processing circuit for small analog alternating current (AC) or direct current (DC) signals | |
| CN205450080U (en) | High voltage DC check out test set of high impedance input | |
| CN101651084B (en) | Electrostatic chuck supply current sampling device, method and plasma device | |
| CN205792213U (en) | Turbine flow converter capable of resisting transient high voltage | |
| CN204290260U (en) | Anti-harmonic wave interference type aftercurrent action protecting equipment | |
| CN102590595B (en) | High-voltage current detection method and detection device | |
| CN101699303A (en) | Circuit for detecting insulation fault of solar battery | |
| CN201199628Y (en) | Protecting equipment for electric force power distribution PLC control detection line | |
| CN104267280A (en) | Multichannel surge protection device detecting device and method | |
| CN203504144U (en) | Electric leakage sampling circuit | |
| CN203561861U (en) | Breakdown protective circuit of insulated gate bipolar transistor module | |
| CN203909133U (en) | Large power high frequency power supply output overvoltage detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181113 Address after: 215000 No. 1000 Songhua Road, Guo Xiang street, Wuzhong Economic and Technological Development Zone, Suzhou, Jiangsu Patentee after: SUZHOU WEICHUANG ELECTRICAL EQUIPMENT TECHNOLOGY Co.,Ltd. Address before: 518000 Baoan District Shiyan street, Shenzhen, Guangdong Province, the third phase of the two phase Industrial Zone, C Patentee before: SHENZHEN VEICHI ELECTRIC CO.,LTD. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 215000 No. 1000 Songhua Road, Guo Xiang street, Wuzhong Economic and Technological Development Zone, Suzhou, Jiangsu Patentee after: Suzhou Weichuang Electrical Technology Co.,Ltd. Address before: 215000 No. 1000 Songhua Road, Guo Xiang street, Wuzhong Economic and Technological Development Zone, Suzhou, Jiangsu Patentee before: SUZHOU WEICHUANG ELECTRICAL EQUIPMENT TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140618 |