CN109975605A - A kind of multi channel detector leakage current automatic measurement system - Google Patents
A kind of multi channel detector leakage current automatic measurement system Download PDFInfo
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- CN109975605A CN109975605A CN201910264230.1A CN201910264230A CN109975605A CN 109975605 A CN109975605 A CN 109975605A CN 201910264230 A CN201910264230 A CN 201910264230A CN 109975605 A CN109975605 A CN 109975605A
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- leakage current
- microcontroller
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- automatic measurement
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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
- G01R15/146—Measuring arrangements for current not covered by other subgroups of G01R15/14, e.g. using current dividers, shunts, or measuring a voltage drop
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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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of multi channel detector leakage current automatic measurement system, automatic measurement system includes: leakage current measurement circuit and microcontroller；Microcontroller controls leakage current measurement circuit when adding high pressure on the microgrid of Micromegas detector, the leakage current between the multiple read-out channels and microgrid of Micromegas detector is measured respectively, and analog-to-digital conversion and calculating are carried out to the output signal of leakage current measurement circuit, obtain the leakage current value of multiple read-out channels.Automatic measurement system provided by the present invention can be realized the automatic measurement of a channel leakage currents up to a hundred, convenient and efficient compared with the mode successively measured manually.
Description
Technical field
The present invention relates to leakage current measurement technical fields, and in particular to a kind of multi channel detector leakage current automatic measurement system
System.
Background technique
It is thickness 50-100 microns of air gap between the microgrid and read-out electrode of Micromegas detector, detector is increased
When pressure, if radiationless signal, the electric current for flowing to anode reading item from microgrid is known as leakage current.Under normal circumstances, the leakage current
Be pA grades or smaller, sparking or dust pollution etc. reasons will so that the leakage current increase, cause corresponding channel signal noise increase,
And read-out electronics system may be damaged.Therefore, when the total leakage current of detector is higher, need to measure each channel respectively
Leakage current finds the excessive channel of leakage current, and disconnects its connection with electronic system.
This wire tension measurement is common in insulation measurement field, and there are many business instrument at present.But it is and supreme
The multichannel leakage current measurement instrument in hundred channels, manual single channel measurement are time-consuming and laborious.
Summary of the invention
In view of the deficiencies in the prior art, the purpose of the present invention is to provide a kind of multi channel detector leakage currents certainly
Dynamic measuring system can carry out automatic measurement by the leakage current to multiple channels simultaneously, and the mode relatively successively measured manually facilitates fast
It is prompt.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of multi channel detector leakage current automatic measurement system, the automatic measurement system include: leakage current measurement electricity
Road and microcontroller；
The microcontroller controls the leakage current measurement circuit when adding high pressure on the microgrid of Micromegas detector,
The leakage current between the multiple read-out channels and the microgrid of the Micromegas detector is measured respectively, and to institute
The output signal for stating leakage current measurement circuit carries out analog-to-digital conversion and calculating, obtains the leakage current value of the multiple read-out channel.
Further, a kind of multi channel detector leakage current automatic measurement system as described above, the multiple read-out channel
Pass through prober interface and the leakage current measurement circuit connection, the microgrid and the leakage current measurement circuit connection.
Further, a kind of multi channel detector leakage current automatic measurement system as described above, the leakage current measurement electricity
Road includes: multichannel read-out electrode, multiple 1G Ω resistance and multiple voltage follower circuits, respectively corresponds one per read-out electrode all the way
Read-out channel, a 1G Ω resistance and a voltage follower circuit, the electric leakage of each read-out channel flow through corresponding 1G Ω resistance
Impedance transformation is carried out by corresponding voltage follower circuit after sampling, is finally output to the microcontroller；
The leakage current measurement circuit further include: 10M Ω resistance and instrument amplification chip, the multiple read-out channel it is total
Electric leakage is amplified after flowing through the 10M Ω resistance sampling by instrument amplification chip, and the microcontroller is finally output to；
There are also all the way for monitoring the leakage current of the microgrid over the ground for the leakage current measurement circuit.
Further, a kind of multi channel detector leakage current automatic measurement system as described above, the automatic measurement system
Further include: simulation multiplex circuit, the simulation multiplex circuit connects the microcontroller and the leakage current measurement circuit, described
Simulation multiplex circuit is used to control the leakage current measurement circuit and the microcontroller under the control of the microcontroller
It is connected and disconnected from.
Further, a kind of multi channel detector leakage current automatic measurement system as described above is increased on the microgrid
Briquetting rubbing board carries high pressure or external high pressure, the onboard high pressure include: boost module and bleeder circuit, the bleeder circuit packet
Include: light coupling relay and divider resistance, the light coupling relay are described onboard for controlling under the control of the microcontroller
The switch of the output voltage of high pressure and lifting.
Further, a kind of multi channel detector leakage current automatic measurement system as described above, the microcontroller are also used
In: the high-voltage power supply of the microgrid is set, it is the multiple measuring if the high-voltage power supply that the microgrid is arranged is the onboard high pressure
The output voltage that the onboard high pressure is controlled during the leakage current value of read-out channel is boosted with preset interval voltage, until
Each leakage current terminates to measure when reaching preset voltage value greater than the output voltage of pre-set current value or the onboard high pressure, if institute
The high-voltage power supply for stating microgrid is the external high pressure, then during measuring the leakage current value of the multiple read-out channel described in control
The output voltage of external high pressure is boosted with pre-set velocity, until each leakage current terminates to measure when stablizing.
Further, a kind of multi channel detector leakage current automatic measurement system as described above, the automatic measurement system
Further include: key, buzzer, LCD display and the bluetooth serial ports module being connect with the microcontroller；
The key is for being configured and controlling to the measurement process of the microcontroller；
The buzzer, which is used for the instruction measurement under the control of the microcontroller, to be terminated；
The LCD display is used to show the measurement result of the microcontroller under the control of the microcontroller；
The bluetooth serial ports module be used under the control of the microcontroller by the measurement result of the microcontroller without
Line is transmitted to computer.
Further, a kind of multi channel detector leakage current automatic measurement system as described above, the microcontroller are
The microcontroller of MC9S12XS128 model.
Further, a kind of multi channel detector leakage current automatic measurement system as described above, the instrument amplification chip
For the chip of INA156 model, the voltage follower circuit is made of the operational amplifier of OPA347 model, the simulation multiplexing
Circuit is made of CD74HC4067 interface board, and the prober interface includes the connector and ERNI of FX10B-140S model
The connector of 154744 models.
Further, a kind of multi channel detector leakage current automatic measurement system as described above, the light coupling relay are
The light coupling relay of AQV224NS model.
The beneficial effects of the present invention are: automatic measurement system provided by the present invention can be realized a channel leakages up to a hundred
The automatic measurement of electric current, it is convenient and efficient compared with the mode successively measured manually.
Detailed description of the invention
Fig. 1 is a kind of structural representation of the multi channel detector leakage current automatic measurement system provided in the embodiment of the present invention
Figure；
Fig. 2 is the circuit diagram of the leakage current measurement circuit provided in the embodiment of the present invention；
Fig. 3 is the process control process schematic diagram of the microcontroller provided in the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with specific embodiment with reference to the accompanying drawings of the specification.
As shown in Figure 1, a kind of multi channel detector leakage current automatic measurement system, automatic measurement system include: leakage current
Measuring circuit and microcontroller；
Microcontroller controls leakage current measurement circuit when adding high pressure on the microgrid of Micromegas detector, right respectively
Leakage current between the multiple read-out channels and microgrid of Micromegas detector measures, and to leakage current measurement circuit
Output signal carries out analog-to-digital conversion and calculating, obtains the leakage current value of multiple read-out channels.
Multiple read-out channels pass through prober interface and leakage current measurement circuit connection, microgrid and leakage current measurement circuit
Connection.
Leakage current measurement circuit includes: multichannel read-out electrode, multiple 1G Ω resistance and multiple voltage follower circuits, per all the way
Read-out electrode respectively corresponds a read-out channel, a 1G Ω resistance and a voltage follower circuit, the leakage of each read-out channel
Electric current carries out impedance transformation by corresponding voltage follower circuit after corresponding 1G Ω resistance sampling, is finally output to microcontroller
Device；
Leakage current measurement circuit further include: total electric leakage of 10M Ω resistance and instrument amplification chip, multiple read-out channels flows through
It is amplified after 10M Ω resistance sampling by instrument amplification chip, is finally output to microcontroller；
There are also all the way for monitoring the leakage current of microgrid over the ground for leakage current measurement circuit.
Automatic measurement system further include: simulation multiplex circuit, simulation multiplex circuit connection microcontroller and leakage current measurement
Circuit, simulation multiplex circuit is for controlling the connection of leakage current measurement circuit and microcontroller under the control of the micro-controller and breaking
It opens.
Added high voltage package rubbing board carries high pressure or external high pressure on microgrid, and onboard high pressure includes: boost module and bleeder circuit,
Bleeder circuit includes: light coupling relay and divider resistance, and light coupling relay for controlling onboard height under the control of the micro-controller
The switch of the output voltage of pressure and lifting.
Microcontroller is also used to: the high-voltage power supply of microgrid is arranged, if the high-voltage power supply of setting microgrid is onboard high pressure, is measuring
The output voltage of onboard high pressure is controlled during the leakage current value of multiple read-out channels to boost with preset interval voltage, until
Each leakage current terminates to measure when reaching preset voltage value greater than the output voltage of pre-set current value or onboard high pressure, if microgrid
High-voltage power supply is external high pressure, then controlled during measuring the leakage current value of multiple read-out channels the output voltage of external high pressure with
Pre-set velocity is boosted, until each leakage current terminates to measure when stablizing.
Automatic measurement system further include: key, buzzer, LCD display and the bluetooth serial ports mould being connect with microcontroller
Block；
Key is for being configured and controlling to the measurement process of microcontroller；
Buzzer terminates for instruction measurement under the control of the micro-controller；
LCD display is used to show the measurement result of microcontroller under the control of the micro-controller；
Bluetooth serial ports module is for being wirelessly transmitted to calculating for the measurement result of microcontroller under the control of the micro-controller
Machine.
Microcontroller is the microcontroller of MC9S12XS128 model.
Instrument amplification chip be INA156 model chip, voltage follower circuit by OPA347 model operational amplifier structure
At, simulation multiplex circuit be made of CD74HC4067 interface board, prober interface include FX10B-140S model connector and
The connector of 154744 model of ERNI.
Working principle: the high-voltage power supply of microgrid is set by key to microcontroller, is added on Micromegas detector microgrid
When high pressure, the leakage current in each channel after voltage signal, is exported by leakage current measurement circuit conversion through multi-channel analog multiplex circuit
To microcontroller, the leakage current value in each channel is successively obtained after analog-to-digital conversion, as the result is shown on an lcd display and through bluetooth string
Mouth mold block is transmitted to computer.
Embodiment one
It is described in detail by taking 128 read-out channels as an example below.
As shown in Figure 1, Micromegas detector to be measured, 128 leakage currents between channel and microgrid are that this is automatic
The measurement object of measuring system.It adds high pressure on microgrid and onboard or external two ways may be selected.Wherein, onboard high pressure is by boosting
Module and bleeder circuit are constituted, and in the range of 50-300V, are divided into 50V between value.Commercial high voltage power supply may be selected in external high pressure,
It is directly connected to microgrid, no ceiling voltage limitation.Bleeder circuit is by light coupling relay AQV224NS and 1M Ω divider resistance
It constitutes.The model MC9S12XS128 of microcontroller controls the on-off of light coupling relay, to control opening for output voltage
It closes and goes up and down.
The read-out channel of detector is connected to the automatic measurement circuit by prober interface, and 140 feet may be selected
154744 connector of ERNI of FX10B-140S connector or two 80 feet.
As shown in Fig. 2, leakage current measurement circuit amounts to 129 tunnels, wherein 128 tunnels are read-out electrode, for measuring microgrid pair
The leakage current of each read-out electrode, another 1 tunnel is ground, for monitoring the leakage current of microgrid over the ground.Rch1-Rch128 is that detector is each logical
Equivalent resistance between road and microgrid, each channel electric leakage flow through the electricity being made of after 1G Ω resistance sampling operational amplifier 0PA347
Pressure follows circuit to carry out impedance transformation, is output to rear class simulation multiplex circuit.Total leakage current after 10M Ω resistance sampling then by passing through
It is exported after instrument amplification chip INA156 amplification to the analog-to-digital conversion interface of microcontroller.The current measurement maximum value in each channel is
4nA, the maximum value of total leakage current measurement are then 10nA.
Simulation multiplex circuit is made of 8 16 tunnels simulation multiplexing chip CD74HC4067, realizes 16 batches of microcontroller point
Analog-to-digital conversion is carried out to leakage current measurement result, each channel leakage current value can be obtained after microcontroller converts.Due to reading item
There are capacitor between microgrid, sampled resistance charges to it after opening, can neglect when charging current is reduced to by high voltage power supply
Accurate leakage current can be measured when slightly horizontal, therefore measurement takes a long time, usually less than 10 minutes.To inhibit 50Hz work
Frequency crosstalk, using the method being averaged after multiple repairing weld in 40ms when analog-to-digital conversion.
As shown in figure 3, microgrid high-voltage power supply is arranged by key in micro-controller program, if selecting onboard high pressure, with
The interval of 50V is boosted, until leakage current is greater than 1nA or high pressure reaches preset value, end measurement；If selecting external high pressure,
It is required that the external high pressure rate of climb is 1V/s, leakage current terminates measurement after stablizing.Buzzer is opened after measurement, and is controlled
LCD shows measurement result, while measurement result is sent to computer through bluetooth serial ports module.
Automatic measurement system through the invention can conveniently and efficiently each channel of automatic measurement Micromegas detector with
Leakage current between microgrid realizes 128 channel leakage current automatic measurement systems, can be under different microgrid high pressures, to detector
Leakage current between each channel and microgrid carries out automatic measurement, convenient and efficient compared with the mode successively measured manually.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technology
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of multi channel detector leakage current automatic measurement system, which is characterized in that the automatic measurement system includes: electric leakage
Flow measurement circuitry and microcontroller；
The microcontroller controls the leakage current measurement circuit when adding high pressure on the microgrid of Micromegas detector, respectively
Leakage current between the multiple read-out channels and the microgrid of the Micromegas detector is measured, and to the leakage
The output signal of current measurement circuit carries out analog-to-digital conversion and calculating, obtains the leakage current value of the multiple read-out channel.
2. a kind of multi channel detector leakage current automatic measurement system according to claim 1, which is characterized in that described more
A read-out channel passes through prober interface and the leakage current measurement circuit connection, the microgrid and leakage current measurement electricity
Road connection.
3. a kind of multi channel detector leakage current automatic measurement system according to claim 2, which is characterized in that the leakage
Current measurement circuit includes: multichannel read-out electrode, multiple 1G Ω resistance and multiple voltage follower circuits, per read-out electrode point all the way
Not Dui Ying a read-out channel, a 1G Ω resistance and a voltage follower circuit, the electric leakage of each read-out channel flow through correspondence
1G Ω resistance sampling after by corresponding voltage follower circuit carry out impedance transformation, be finally output to the microcontroller；
The leakage current measurement circuit further include: 10M Ω resistance and instrument amplification chip, total electric leakage of the multiple read-out channel
It is amplified after flowing through the 10M Ω resistance sampling by instrument amplification chip, is finally output to the microcontroller；
There are also all the way for monitoring the leakage current of the microgrid over the ground for the leakage current measurement circuit.
4. a kind of multi channel detector leakage current automatic measurement system according to claim 3, which is characterized in that it is described from
Dynamic measuring system further include: simulation multiplex circuit, the simulation multiplex circuit connects the microcontroller and the leakage current is surveyed
Measure circuit, the simulation multiplex circuit be used for controlled under the control of the microcontroller leakage current measurement circuit with it is described
Microcontroller is connected and disconnected from.
5. a kind of multi channel detector leakage current automatic measurement system according to claim 1, which is characterized in that described micro-
Online added high voltage package rubbing board carries high pressure or external high pressure, and the onboard high pressure includes: boost module and bleeder circuit, and described point
Volt circuit includes: light coupling relay and divider resistance, and the light coupling relay under the control of the microcontroller for controlling
The switch of the output voltage of the onboard high pressure and lifting.
6. a kind of multi channel detector leakage current automatic measurement system according to claim 5, which is characterized in that described micro-
Controller is configured the high-voltage power supply of the microgrid, if the high-voltage power supply that the microgrid is arranged is the onboard high pressure, is surveying
Measure control during the leakage current value of the multiple read-out channel the output voltage of the onboard high pressure with preset interval voltage into
Row boosting, knot when each leakage current reaches preset voltage value greater than the output voltage of pre-set current value or the onboard high pressure
Beam measurement；If the high-voltage power supply that the microgrid is arranged is the external high pressure, in the leakage current for measuring the multiple read-out channel
The output voltage that the external high pressure is controlled during value is boosted with pre-set velocity, until each leakage current terminates to survey when stablizing
Amount.
7. a kind of multi channel detector leakage current automatic measurement system described in -6 according to claim 1, which is characterized in that described
Automatic measurement system further include: key, buzzer, LCD display and the bluetooth serial ports module being connect with the microcontroller；
The key is for being configured and controlling to the measurement process of the microcontroller；
The buzzer, which is used for the instruction measurement under the control of the microcontroller, to be terminated；
The LCD display is used to show the measurement result of the microcontroller under the control of the microcontroller；
The bluetooth serial ports module is for wirelessly passing the measurement result of the microcontroller under the control of the microcontroller
Transport to computer.
8. a kind of multi channel detector leakage current automatic measurement system according to claim 1-6, feature exist
In the microcontroller is the microcontroller of MC9S12XS128 model.
9. a kind of multi channel detector leakage current automatic measurement system according to claim 4, which is characterized in that the instrument
Table amplification chip is the chip of INA156 model, and the voltage follower circuit is made of the operational amplifier of 0PA347 model, institute
It states simulation multiplex circuit to be made of CD74HC4067 interface board, the prober interface includes the connector of FX10B-140S model
With the connector of ERNI154744 model.
10. a kind of multi channel detector leakage current automatic measurement system according to claim 5, which is characterized in that described
Light coupling relay is the light coupling relay of AQV224NS model.
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| CN201910264230.1A CN109975605A (en) | 2019-04-02 | 2019-04-02 | A kind of multi channel detector leakage current automatic measurement system |
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Family
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116338295A (en) * | 2023-03-03 | 2023-06-27 | 中国科学院近代物理研究所 | Front end readout electronic circuit of TPC detector |
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Application publication date: 20190705 |