CN202710653U - Digital isolation sampling circuit of high common mode voltage analog signals - Google Patents
Digital isolation sampling circuit of high common mode voltage analog signals Download PDFInfo
- Publication number
- CN202710653U CN202710653U CN 201220366471 CN201220366471U CN202710653U CN 202710653 U CN202710653 U CN 202710653U CN 201220366471 CN201220366471 CN 201220366471 CN 201220366471 U CN201220366471 U CN 201220366471U CN 202710653 U CN202710653 U CN 202710653U
- Authority
- CN
- China
- Prior art keywords
- isolation
- digital
- common mode
- analog
- mode voltage
- 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
Images
Landscapes
- Amplifiers (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
The utility model discloses a digital isolation sampling circuit of high common mode voltage analog signals. An operational amplifier and an analog-to-digital converter are adopted by an analog signal side for performing conditioning and conversion of signals, and converted digital signals are transmitted to a processor in a control unit after being isolated by optical couplers or magnetic elements with high isolation voltage. According to the digital isolation sampling circuit, electrical isolation between a power unit sampling side and the processor side of the control unit is realized; the digital isolation sampling circuit is high in isolation voltage, high in tolerance of common mode voltage, high in anti-interference, high in flexibility and wide in selection of specific devices for electrical isolation. The digital isolation sampling circuit is simple in structure and high in reliability, can be well popularized, and can be used in other similar application occasions.
Description
Technical field
The utility model relates to the analog quantity sampling isolation applications such as the voltage, electric current of high common mode voltage in the power electronics and power drives control module, and technical field belongs to industrial control field.
Background technology
The control module of power electronics and power drives is monitoring, control, communication maincenters of power electronics and power drives plant capacity element loop, it is by detecting, sample the voltage of power cell, the magnitude of current, quantity of state etc., calculate according to certain control algolithm, according to the certain driving pulse of result of calculation output, the switch behavior of power device in the power ratio control element loop.As seen, reliable, the accurately sampling of various electric parameters seem particularly important for the computing of control module.
When control module is sampled to the analog quantitys such as electric current and voltage of power cell, need to carry out electrical isolation, otherwise the undesired signal of power cell is easy to enter control module, affect on the one hand the Stability and veracity of measurement data, on the other hand the reliability of control module exerted an influence.For example, when loop of power circuit bore surge impact, surging signal can enter control module, may damage the components and parts of control module.
After the input analog amount isolation of control module and power cell, very high common mode voltage may occur between the two, if isolation strength is inadequate, affect equally the reliability of control module.At present, adopt the mode of simulation isolation to have the devices such as Hall element isolation, isolation amplifier, linear optical coupling to isolate, but the limitation such as that they exist is saturated, precision, bandwidth, temperature are floated, intermediate link error.The mode that adopts the numeral isolation is also arranged, for example, voltage-frequency converter (VFC), its good in anti-interference performance be fit to long-distance transmissions, but transmission speed is slow, is not suitable for fast-changing signal.
The utility model content
The purpose of this utility model is the isolation Sampling that solves analog quantity in the power electronics and power drives control module.
In order to realize above-mentioned functions, the utility model provides following technical scheme:
A kind of numeral isolation sample circuit of high common mode voltage simulating signal is characterized in that, comprising:
Operational amplifier amplifies the simulating signal of simulating signal input side,
Analog-digital converter, will amplify the analog signal conversion of exporting through described operational amplifier is digital signal,
After isolating by the digital signal isolating device, the output of analog-digital converter delivers to the processor interface of control module.
Described digital signal isolating device is optocoupler, magnetic isolation device or radio frequency isolation device.
Provide power supply by the insulating power supply modular converter for operational amplifier or the analog-digital converter of simulating signal input side.
The input of described insulating power supply modular converter is from the power supply access of described processor side.
The technical program is directly on the analog quantity sampling loop of power cell simulating signal to be carried out operation amplifier, then sending into analog-digital converter (ADC) changes, the digital signal of output is through the isolating device of high-isolating after the conversion, deliver to the processor interface of control module, carry out computing by processor.The power supply of amplifier amplifier (OP) and analog-digital converter (ADC) is provided by the power transfer module of high-isolating.Saturated, non-linear, the limit bandwidth that before isolation analog quantity is carried out that analog to digital conversion can solve effectively that isolating device exists, temperature such as float at the problem, improve the precision of sampling.
Principle of work of the present utility model is as follows:
The analog signal flows such as the electric current and voltage of loop of power circuit are resistance after testing, and detecting ohmically voltage signal namely is the electric parameters that need to sample.This electric parameters zooms in or out through operational amplifier (OP), and its final amplitude is relevant with analog-digital converter (ADC) figure place and range.Simulating signal after operational amplifier (OP) conditioning, send into the input interface of analog-digital converter (ADC), after the analog digital conversion process of inside, export some column of figure signals corresponding with simulating signal, these signals can adopt different coded systems.These digital signals after level conversion, are directly sent into the corresponding interface of the CPU of processor side after isolating by isolating device.The OP of simulating signal side and the power supply of ADC are provided by the power transfer module of a high-isolating.
Processor side and simulating signal input side have very high isolation voltage, can improve the common mode voltage ability that circuit bears, and have very high interference free performance.
The beneficial effect that the utility model reaches:
1) realized the electrical isolation of the processor side of power cell sampling side and control module;
2) isolation voltage is high, and tolerance common mode voltage ability is strong, strong anti-interference performance;
3) dirigibility is high, and the device range of choice of specific implementation is wide;
4) the technical program is simple in structure, and reliability is high;
5) generalization is good, can be used for other similar application occasions.
Description of drawings
Fig. 1 is the schematic diagram of the numeral isolation sampling of high common mode voltage simulating signal.
Embodiment
Below in conjunction with accompanying drawing the utility model is further specified, Fig. 1 is a kind of theory diagram of the numeral isolation method of sampling of high common mode voltage simulating signal, mainly comprise three contents, be respectively signal condition and conversion, digital signal isolating device and the insulating power supply modular converter of simulating signal side.
The signal condition of simulating signal side (power cell side) mainly is comprised of operational amplifier (OP) and analog-digital converter (ADC) with conversion.The characteristics of the selective basis simulating signal of operational amplifier (OP) are selected, and can be single power supplies, can be dual power supplies, bandwidth can height can be low, also can be special amplifier, for example instrument amplifier; The selection of analog-digital converter (ADC) is also very extensive, and slewing rate, figure place etc. are not limited.
The digital signal isolating device is the key of signal isolation, mainly adopts light-coupled isolation and magnetic isolation dual mode.Isolation voltage will be selected according to application demand.For example, the isolation voltage of a lot of optical coupling isolators can both reach more than the 5000VAC.
The insulating power supply modular converter is that the device for the simulating signal side provides power supply, and in like manner, what its isolation voltage technical indicator also will be with digital isolator spare is identical, could satisfy application demand.At present, existing chip producer can realize the module product of 5000VAC isolation voltage grade.The processing such as the output of insulating power supply can be carried out step-down as required, boosts, counter-rotating.
The above only is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvement and distortion, these improvement and distortion also should be considered as protection domain of the present utility model.
Claims (4)
1. the numeral of high common mode voltage simulating signal isolation sample circuit is characterized in that, comprising:
Operational amplifier amplifies the simulating signal of simulating signal input side,
Analog-digital converter, will amplify the analog signal conversion of exporting through described operational amplifier is digital signal,
After isolating by the digital signal isolating device, the output of analog-digital converter delivers to the processor interface of control module.
2. the numeral of a kind of high common mode voltage simulating signal according to claim 1 isolation sample circuit is characterized in that, described digital signal isolating device is optocoupler, magnetic isolation device or radio frequency isolation device.
3. the numeral of a kind of high common mode voltage simulating signal according to claim 1 isolation sample circuit is characterized in that, provides power supply by the insulating power supply modular converter for operational amplifier or the analog-digital converter of simulating signal input side.
4. the numeral of a kind of high common mode voltage simulating signal according to claim 3 isolation sample circuit is characterized in that, the input of described insulating power supply modular converter is from the power supply access of described processor side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220366471 CN202710653U (en) | 2012-07-27 | 2012-07-27 | Digital isolation sampling circuit of high common mode voltage analog signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220366471 CN202710653U (en) | 2012-07-27 | 2012-07-27 | Digital isolation sampling circuit of high common mode voltage analog signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202710653U true CN202710653U (en) | 2013-01-30 |
Family
ID=47590941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220366471 Expired - Lifetime CN202710653U (en) | 2012-07-27 | 2012-07-27 | Digital isolation sampling circuit of high common mode voltage analog signals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202710653U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467864A (en) * | 2014-11-18 | 2015-03-25 | 东莞市毫克检测仪器有限公司 | High-speed and anti-interference bridge signal collecting card |
| CN104502687A (en) * | 2014-12-19 | 2015-04-08 | 上海发电设备成套设计研究院 | High-withstand-voltage generator excitation current collector based on magnetic isolation |
| CN107907736A (en) * | 2017-12-27 | 2018-04-13 | 广东东方电讯科技有限公司 | Digitize non-linear simulation front end measuring circuit |
| CN107991529A (en) * | 2017-12-27 | 2018-05-04 | 广东东方电讯科技有限公司 | Non-linear power measures analysis recorder |
| CN109343412A (en) * | 2018-11-05 | 2019-02-15 | 郑州煤机液压电控有限公司 | Hydraulic support electronic control system signal coupler |
| CN109932547A (en) * | 2017-12-15 | 2019-06-25 | 北京机电工程研究所 | Sampling system is isolated in multichannel |
| CN113835038A (en) * | 2021-09-30 | 2021-12-24 | 中国船舶重工集团公司第七二四研究所 | Isolated sampling method applied to power supply |
-
2012
- 2012-07-27 CN CN 201220366471 patent/CN202710653U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467864A (en) * | 2014-11-18 | 2015-03-25 | 东莞市毫克检测仪器有限公司 | High-speed and anti-interference bridge signal collecting card |
| CN104467864B (en) * | 2014-11-18 | 2018-05-08 | 东莞市南添检测仪器有限公司 | A kind of anti-interference bridge signal capture card of high speed |
| CN104502687A (en) * | 2014-12-19 | 2015-04-08 | 上海发电设备成套设计研究院 | High-withstand-voltage generator excitation current collector based on magnetic isolation |
| CN109932547A (en) * | 2017-12-15 | 2019-06-25 | 北京机电工程研究所 | Sampling system is isolated in multichannel |
| CN107907736A (en) * | 2017-12-27 | 2018-04-13 | 广东东方电讯科技有限公司 | Digitize non-linear simulation front end measuring circuit |
| CN107991529A (en) * | 2017-12-27 | 2018-05-04 | 广东东方电讯科技有限公司 | Non-linear power measures analysis recorder |
| CN109343412A (en) * | 2018-11-05 | 2019-02-15 | 郑州煤机液压电控有限公司 | Hydraulic support electronic control system signal coupler |
| CN113835038A (en) * | 2021-09-30 | 2021-12-24 | 中国船舶重工集团公司第七二四研究所 | Isolated sampling method applied to power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202710653U (en) | Digital isolation sampling circuit of high common mode voltage analog signals | |
| CN2938119Y (en) | Photoelectric coupling AC voltage separation measuring circuit | |
| CN104198907A (en) | Power device current leakage detecting device and intelligent power module detecting equipment | |
| CN204652350U (en) | Intelligence analog-digital commutator | |
| CN204166775U (en) | Biousse banding pattern cell neural network chaos circuit is bought on three rank | |
| CN202535313U (en) | Input end circuit of on-line monitoring system of SF6 trace moisture density | |
| CN202916360U (en) | Switching value tester | |
| CN203324859U (en) | FPGA-based temperature compensation control circuit | |
| CN206056815U (en) | New isolated temperature sampling apparatuses | |
| CN201788237U (en) | Handheld electric wave recording analyzer | |
| CN201171153Y (en) | DC protection test control apparatus | |
| CN203021591U (en) | Double-loop furnace top weighing system | |
| CN204376876U (en) | Data acquisition system | |
| CN203837808U (en) | Differential-strain-sheet-based type pole tower vibration monitoring device | |
| CN203690935U (en) | Novel TSC reactive compensation controller | |
| CN203101499U (en) | Voltage acquisition circuit | |
| CN203337717U (en) | Voltage signal conditioning circuit for electric leakage auto-reclosing circuit breaker | |
| CN201479118U (en) | Digital-to-analog signal converter and electric energy quality signal generator using the same | |
| CN203278856U (en) | A digital intelligent signal isolator | |
| CN202502219U (en) | Calibration device for gas relay | |
| CN201063603Y (en) | True effective value converting circuit with low temperature drift | |
| CN206248719U (en) | A kind of high-pressure side DC voltage sampling module of electric power electric transformer | |
| CN104267280A (en) | Multichannel surge protection device detecting device and method | |
| CN203053711U (en) | Analog signal transmitter for vehicle sideslip detection platform | |
| CN203732951U (en) | Wireless remote measurement and control terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150922 Address after: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Patentee after: NANJING NARI Group Corp. Patentee after: NARI TECHNOLOGY Co.,Ltd. Address before: High road high tech Development Zone Nanjing city Jiangsu province 210061 No. 20 Patentee before: NARI TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130130 |