CN113419096A - Multi-channel voltage isolation voltage divider - Google Patents
Multi-channel voltage isolation voltage divider Download PDFInfo
- Publication number
- CN113419096A CN113419096A CN202110781264.5A CN202110781264A CN113419096A CN 113419096 A CN113419096 A CN 113419096A CN 202110781264 A CN202110781264 A CN 202110781264A CN 113419096 A CN113419096 A CN 113419096A
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- China
- Prior art keywords
- voltage
- hall sensor
- isolation
- voltage hall
- divider
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
Abstract
The invention relates to a multi-channel voltage isolation voltage divider, which comprises more than one voltage isolation voltage divider unit, wherein the voltage isolation voltage divider unit comprises more than one voltage Hall sensor, the more than one voltage Hall sensors are cascaded, the voltage of an input end is connected to the primary side input end of a head-end voltage Hall sensor after being divided by a resistor string, and the measuring end of a tail-end voltage Hall sensor is connected to a data acquisition system at the rear end. More than one voltage Hall sensor is arranged between the test voltage with large voltage level and the data acquisition system with small voltage level, and the voltage Hall sensors have good isolation performance, high measurement precision and relatively low cost.
Description
Technical Field
The invention relates to a multi-channel voltage isolation voltage divider.
Background
In the type test of a low-voltage electrical appliance, a plurality of projects need to acquire voltage and current waveforms in real time, such as a short-circuit performance test, an electrical service life test and the like, in the test projects, the voltage of an acquisition port of a data acquisition system is generally a small voltage signal, and the test voltage is generally between 1500V and 110V, so that the test voltage cannot be directly connected to the data acquisition system and needs to be processed in an intermediate link. One method in the prior art is to use a resistor to divide voltage and then connect a test voltage, which is very economical and practical, but because a physical isolation structure is not arranged between the test voltage and a data acquisition system, the transient overvoltage after the low-voltage electrical appliance is turned off is very high during a short-circuit test, and an acquisition port of the data acquisition system is easily burnt out; the other method is to encapsulate the special device into a voltage acquisition module, convert the analog signal into an optical fiber signal, and then restore the optical fiber signal into an analog signal at the inlet end of the data acquisition system and send the analog signal into the data acquisition system.
Disclosure of Invention
In view of the above, the present invention provides a multi-channel voltage isolation voltage divider with safety test, high accuracy and relatively low cost.
In order to achieve the above object, the present invention adopts such a multi-channel voltage isolation voltage divider, which comprises more than one voltage isolation voltage divider unit, wherein the voltage isolation voltage divider unit comprises more than one voltage hall sensor, the more than one voltage hall sensors are cascaded, the voltage at the input end is divided by a resistor string and then is connected to the primary side input end of the first-end voltage hall sensor, and the measuring end of the tail-end voltage hall sensor is connected to the data acquisition system at the rear end. Compared with the prior art, the invention has the beneficial technical effects that: more than one voltage Hall sensor is arranged between the test voltage with large voltage level and the data acquisition system with small voltage level, and the voltage Hall sensors have good isolation performance, high measurement precision and relatively low cost.
Particularly, the voltage isolation voltage divider unit comprises a first voltage hall sensor and a second voltage hall sensor, wherein the voltage of the input end is divided by a resistor string and then is connected to the primary side input end of the first voltage hall sensor, a current signal output by the measuring end of the first voltage hall sensor is converted into a voltage signal and then is connected to the primary side input end of the second voltage hall sensor, and a current signal output by the measuring end of the second voltage hall sensor is converted into an adjustable measuring voltage. Through the arrangement of the structure, the two stages of voltage Hall sensors are cascaded, and each stage of Hall sensor can bear certain withstand voltage, so that the impact withstand voltage of the whole system is higher.
In particular, the more than one voltage hall sensors are separately powered by separate isolation transformers. Through the arrangement of the structure, the power supply of each stage of voltage Hall sensor is independent, and the electrical isolation performance between adjacent stages is guaranteed.
Particularly, the first voltage Hall sensor and the second voltage Hall sensor are arranged on a circuit board, and the circuit board is positioned between the primary level and the secondary level of the first voltage Hall sensor and is hollowed out at the position between the primary level and the secondary level of the second voltage Hall sensor. Through the arrangement of the structure, the primary and the secondary of the voltage Hall sensor are hollowed out, and the sufficient safety distance between the primary and the secondary is ensured.
Drawings
FIG. 1 is a circuit diagram of a voltage isolation divider cell in a multi-channel voltage isolation divider of the present invention.
Detailed Description
As shown in fig. 1, a multi-channel voltage isolation voltage divider includes more than one voltage isolation voltage divider unit, where the voltage isolation voltage divider unit includes more than one voltage hall sensor, the more than one voltage hall sensors are cascaded, the voltage at the input end is divided by a resistor string and then is connected to the primary side input end of the first-end voltage hall sensor, and the measurement end of the tail-end voltage hall sensor is connected to the data acquisition system at the rear end.
The voltage isolation voltage divider unit comprises a first voltage Hall sensor and a U1 second voltage Hall sensor U2, voltages J1 and J2 at input ends are divided by resistor strings and then are connected to primary side input ends U1-1 and U1-2 of the first voltage Hall sensor U1, a current signal output by a measuring end U1-5 of the first voltage Hall sensor U1 is converted into a voltage signal and then is connected to primary side input ends U2-1 and U2-2 of the second voltage Hall sensor U2, and a current signal output by a measuring end U2-5 of the second voltage Hall sensor U2 is converted into an adjustable measuring voltage AI 0.
In the above, the voltage hall sensor adopts the model LV25P, the voltage dividing resistor string adopts the high-precision non-inductive resistor with the precision of one thousandth, the inductance between the resistor strings can be reduced, and the overall precision of the voltage isolating voltage divider unit can reach the metering requirement of 0.2 level. In addition, each stage of Hall sensor can bear the withstand voltage of 3.5KV/1min, and the impact withstand voltage of the whole system can reach 15 KV.
The first voltage hall sensor U1 and the second voltage hall sensor U2 are separately powered with separate isolation transformers. The power supply of the first voltage Hall sensor U1 is DC +15V1 and DC-15V1, and the power supply of the second voltage Hall sensor U2 is DC +15V2 and DC-15V 2.
The first voltage Hall sensor U1 and the second voltage Hall sensor U2 are arranged on a circuit board, and the position between the primary and the secondary of the first voltage Hall sensor U1 and the position between the primary and the secondary of the second voltage Hall sensor U2 on the circuit board are hollowed out.
Claims (4)
1. A multi-channel voltage isolating divider, comprising: the voltage isolation voltage divider unit comprises more than one voltage Hall sensor, the more than one voltage Hall sensor are cascaded, the voltage of an input end is divided by a resistor string and then is connected to the primary side input end of the head end voltage Hall sensor, and the measuring end of the tail end voltage Hall sensor is connected to a data acquisition system at the rear end.
2. The multi-channel voltage isolating divider of claim 1, wherein: the voltage isolation voltage divider unit comprises a first voltage Hall sensor and a second voltage Hall sensor, wherein the voltage of an input end is divided by a resistor string and then is connected to the input end at the primary side of the first voltage Hall sensor, a current signal output by the measuring end of the first voltage Hall sensor is converted into a voltage signal and then is connected to the input end at the primary side of the second voltage Hall sensor, and a current signal output by the measuring end of the second voltage Hall sensor is converted into an adjustable measuring voltage.
3. The multi-channel voltage isolating divider according to claim 1 or 2, characterized in that: the more than one voltage Hall sensors are separately powered by independent isolation transformers.
4. The multi-channel voltage isolating divider of claim 3, wherein: the first voltage Hall sensor and the second voltage Hall sensor are arranged on the circuit board, and the circuit board is hollow at the position between the primary and the secondary of the first voltage Hall sensor and the position between the primary and the secondary of the second voltage Hall sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110781264.5A CN113419096A (en) | 2021-07-10 | 2021-07-10 | Multi-channel voltage isolation voltage divider |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110781264.5A CN113419096A (en) | 2021-07-10 | 2021-07-10 | Multi-channel voltage isolation voltage divider |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113419096A true CN113419096A (en) | 2021-09-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110781264.5A Withdrawn CN113419096A (en) | 2021-07-10 | 2021-07-10 | Multi-channel voltage isolation voltage divider |
Country Status (1)
| Country | Link |
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| CN (1) | CN113419096A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998502A (en) * | 2012-12-06 | 2013-03-27 | 陈实 | High-isolation voltage-resisting bidirectional signal sensor |
| CN203479894U (en) * | 2013-09-27 | 2014-03-12 | 贵阳供电局 | Multipath direct current voltage non-common-ground isolation sampling circuit |
| CN203786234U (en) * | 2013-10-30 | 2014-08-20 | 北京交通大学 | On-line fault positioning device for power-transmission line insulator based on Zigbee |
| CN206348377U (en) * | 2016-12-28 | 2017-07-21 | 深圳圣斯尔电子技术有限公司 | A kind of high direct voltage isolating transmitter |
| CN209432897U (en) * | 2018-10-23 | 2019-09-24 | 广州擎天实业有限公司 | A kind of adaptive high voltage small current measurement device of band isolation |
| CN110445386A (en) * | 2019-06-20 | 2019-11-12 | 广东博德新能源技术有限公司 | A kind of two-stage isolated power supply |
-
2021
- 2021-07-10 CN CN202110781264.5A patent/CN113419096A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998502A (en) * | 2012-12-06 | 2013-03-27 | 陈实 | High-isolation voltage-resisting bidirectional signal sensor |
| CN203479894U (en) * | 2013-09-27 | 2014-03-12 | 贵阳供电局 | Multipath direct current voltage non-common-ground isolation sampling circuit |
| CN203786234U (en) * | 2013-10-30 | 2014-08-20 | 北京交通大学 | On-line fault positioning device for power-transmission line insulator based on Zigbee |
| CN206348377U (en) * | 2016-12-28 | 2017-07-21 | 深圳圣斯尔电子技术有限公司 | A kind of high direct voltage isolating transmitter |
| CN209432897U (en) * | 2018-10-23 | 2019-09-24 | 广州擎天实业有限公司 | A kind of adaptive high voltage small current measurement device of band isolation |
| CN110445386A (en) * | 2019-06-20 | 2019-11-12 | 广东博德新能源技术有限公司 | A kind of two-stage isolated power supply |
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| PB01 | Publication | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210921 |
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| WW01 | Invention patent application withdrawn after publication |