CN207541186U - A kind of current measurement circuit for insulating core transformer typ high voltage power supply - Google Patents
A kind of current measurement circuit for insulating core transformer typ high voltage power supply Download PDFInfo
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- CN207541186U CN207541186U CN201721362323.0U CN201721362323U CN207541186U CN 207541186 U CN207541186 U CN 207541186U CN 201721362323 U CN201721362323 U CN 201721362323U CN 207541186 U CN207541186 U CN 207541186U
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Abstract
The utility model discloses a kind of current measurement circuits for insulating core transformer typ high voltage power supply, this measuring circuit can simply and effectively avoid high voltage power supply from electronic beam current caused by high voltage arc in high-voltage breakdown or accelerating tube occur and measure sample circuit and the damage of PLC measurement modules, it can ensure the accurate sampling of electronic beam current parameter and measure, while the direct test function in debugging stage is provided.This measuring circuit obtains the voltage division signal of electric current by high voltage power supply ground terminal high precision sampling resistance; input terminal passes through integrated multilevel overvoltage protection; the filtered circuit of voltage division signal amplifies voltage signal by accurate instrumentation amplifier, and realization is matched with the range of the A/D modules of PLC.Resistance front end and instrumentation amplifier both ends increase switching switch and terminal are being measured simultaneously, the stage is debugged not against control system directly multimeter or oscilloscope measurement voltage division signal for accelerator.The utility model has comprehensive, safety, accurately, it is multi-functional the advantages that.
Description
Technical field
The utility model belongs to RADIATION PROCESSING application mesohigh type electron accelerator technical field, more particularly, to one
Kind is used for the current measurement circuit of insulating core transformer typ high voltage power supply.
Background technology
Electron beam irradiation processes an important application as civilian non-powered nuclear technology, has produced huge economy
Benefit.Cure for the RADIATION PROCESSING application of below 1MeV, such as face coat, hydrogel preparation, Special Wires and Cables, film material
Rapid growths or emerging application field, the insulating core transformer typ electron accelerators such as material are a kind of most suitable machines
Type.
Insulating core transformer typ electron accelerator energy range is generally from hundreds of kilo electron volts to one million electro-volt
Spy, electronic beam current are strong general up to tens milliamperes.Since accelerating tube ohmic leakage stream and high-tension measurement resistance heap leakage current all compare
Smaller, the electric current of general measure DC high-voltage power supply indicates that electronic beam current is strong, so the measurement of high voltage power supply electric current is very
Part and parcel.
The hundreds of kilovolts of voltage exported by insulating core transformer typ accelerator high voltage power supply are full of six using closed steel drum
Sulfur fluoride gas insulate, and high pressure, which introduces, accelerates tube end, while be vacuum inside accelerating tube, and such structure causes to insulate
Core transformer type electron accelerator is susceptible to the failures such as sparking inside high-voltage breakdown or accelerating tube in development and debugging stage, should
Failure can cause high voltage power supply moment to generate pulse high current, can lead to current measurement using resistance damage or sampling resistor two
End generates the A/D modules that high voltage pulse directly damages control system measurement PLC.Sampled voltage also needs to the A/ with PLC simultaneously
The range of D-module is suitably matched, and just can guarantee the safe and accurate measurement of high voltage power supply electric current.
Utility model content
In view of the drawbacks of the prior art, the purpose of this utility model is to provide one kind to be used for insulating core transformer typ high pressure
The current measurement circuit of power supply, it is intended to which solution is susceptible to sparking failure inside high-voltage breakdown or accelerating tube in the prior art to be caused
The problem of security reliability is poor.
The utility model provides a kind of current measurement circuit for insulating core transformer typ high voltage power supply, including：According to
Sampling unit, Overvoltage protecting unit, filter unit, signal amplification unit, overload protection unit and the measuring unit of secondary connection；It adopts
Sample unit is used for collecting work electric current, and Overvoltage protecting unit filters for protecting destruction of the sparking breakdown fault to late-class circuit
For being filtered to the operating current and eliminating the interference signal in working environment, signal amplification unit is used for unit
Amplify filtered operating current to meet the range requirement of measuring unit, overload protection unit is used to that circuit overloads to be avoided to cause
Output more than the measuring unit range, measuring unit be used for measure insulating core transformer typ high voltage power supply electric current and lead to
PLC is crossed to show.
Further, current measurement circuit further includes：It is arranged between the sampling unit and high voltage power supply to be measured
Switch unit is used to implement in the accelerator debugging stage not against control system directly with multimeter or oscilloscope measurement partial pressure letter
Number, in the accelerator operation stage, it coordinates with rear class oscillograph BNC measurement terminals and PLC measuring units is mutually authenticated, with monitoring
With the correctness for ensureing measurement result.
Further, switch unit includes：Switch and multimeter terminal, do not enable control when being debugged for accelerator
System directly measures and flows through the electric current of sampling resistor, when obtaining its partial pressure and realizing accelerator normal operation sampled signal monitoring and
Numeric ratio pair.
Further, sampling unit includes multiple sampling resistors being connected in parallel.Sampling unit can be suitable for difference
The high voltage power supply output current of nominal parameter measures, and classification Overvoltage protecting unit is integrated, by a variety of pressure-sensitive electricity of different voltages grade
Resistance is in parallel, ensures sampling resistor maximum partial pressure value when minimum voltage grade is more than normal, by multiple redundancy, realizes high-voltage breakdown
When pulse high current ground protection.
Further, Overvoltage protecting unit includes：The varistor of multiple and different pressure sensitive voltage ranks is in parallel.
Further, filter unit is π type filter units.
Further, signal amplification unit includes：Instrument puts AD620 and its peripheral circuit.
Further, overload protection unit includes：Varistor, for avoiding overload current to measuring unit module
It destroys.
Further, measuring unit is with multifunctional measuring unit, is measuring resistance front end and instrumentation amplifier two
End increases switching switch and terminal, for the accelerator debugging stage not against control system directly multimeter or oscilloscope measurement point
Press signal.Measuring unit includes：PLC measurement modules and oscillograph BNC terminals, control system is not enabled when being debugged for accelerator
The waveform monitoring of sampled signal and numerical value compare when directly measuring the partial pressure of sampling resistor and realizing accelerator normal operation.
By the contemplated above technical scheme of the utility model, compared with prior art, due to adopting using smaller value
Sample resistance, therefore when striking sparks, test sample resistance both end voltage is smaller, this failure terminal voltage can be protected easily with varistor
Shield, the varistor parallel connection of more protection levels can cover different degrees of sparking breakdown；The accurate amplification of sampled signal makes survey
Amount signal meets the range needs of PLC, and this avoid the excessive pressure damages PLC that the larger sampling resistor of tradition is brought；Its is a variety of
The cooperation of measurement means may be implemented in the shape that works when accelerator debugging stage disengaging control system is measured with accelerator normal operation
The monitoring and comparison of state.
Description of the drawings
Fig. 1 is the current measurement electricity for insulating core transformer typ high voltage power supply that the utility model first embodiment provides
The functional block diagram on road；
Fig. 2 is the current measurement electricity for insulating core transformer typ high voltage power supply that the utility model second embodiment provides
The functional block diagram on road；
Fig. 3 is the current measurement circuit for insulating core transformer typ high voltage power supply that the utility model embodiment provides
Physical circuit figure.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention is further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
The utility model provides a kind of high voltage power supply current measurement circuit for insulating core transformer typ irradiation accelerator,
The electric current of high voltage power supply can comprehensively be measured in real time, have safety, reliably, it is easy to operate the advantages of.
As shown in Figure 1, the electric current for insulating core transformer typ high voltage power supply that the utility model first embodiment provides
Measuring circuit 2 includes：Sequentially connected sampling unit 21, Overvoltage protecting unit 22, filter unit 23, signal amplification unit 24,
Overload protection unit 25 and measuring unit 26 after sampling unit 21 samples operating current, are protected by multipole Overvoltage protecting unit 22
Card avoids destruction of the sparking breakdown fault to late-class circuit, and filter unit 23 can eliminate the interference signal of working environment, and signal is put
Big unit 24 can amplify the sampled signal of prime to meet the range requirement of measuring unit, and overload protection unit 25 can ensure to keep away
Exempt from the range of output measuring unit caused by circuit overloads, measuring unit 26 is shown in addition to conventional measured by PLC, by with
The simple switching of circuit is directly measured the multiselect being mutually authenticated with the realization of the conjunction measuring of oscillograph by multimeter and measures function.For
The range of matching measuring unit, traditional measuring circuit use big resistance measurement, can not ensure that sparking breakdown fault occurs
When measuring unit safety, and the utility model circuit can facilitate realization using small resistance measurement by multistage varistor
Overvoltage protection, then carry out the security measurement that signal can be realized in signal amplification.
Wherein, sampling unit 21 can be suitable for the high voltage power supply output current measurement of different nominal parameters, integrate classification
Overvoltage protecting unit 22 by the parallel connection of a variety of different voltages grade varistors, ensures to sample when minimum voltage grade is more than normal
Resistance maximum partial pressure value, by multiple redundancy, the ground protection of pulse high current when realizing high-voltage breakdown.
Filter unit 23 is filtered sampled voltage using LC filter circuits.Essence may be used in signal amplification unit 24
Close instrumentation amplifier and its matched peripheral circuit.Surpass with the overload protection unit 25 of varistor is used for sample rate current
Its measured value is more than the protection of measuring unit range when crossing running current but being less than sparking breakdown current.
Measuring unit 26, which is used to facilitate operating current real-time display in man-machine interface, reads equipment running current.
As shown in Fig. 2, the electric current for insulating core transformer typ high voltage power supply that the utility model second embodiment provides
Measuring circuit 2 increases switch unit 20 compared with first embodiment between high voltage power supply 1 and sampling unit 21, and switching is single
Member can be realized in the accelerator debugging stage not against control system directly with multimeter or oscilloscope measurement voltage division signal, added
The fast device operation phase, it was mutually authenticated with rear class oscillograph BNC measurement terminals and the cooperation of PLC measuring units, was surveyed with monitoring and ensureing
Measure the correctness of result.
Fig. 3 shows the current measurement electricity for insulating core transformer typ high voltage power supply that the utility model embodiment provides
The physical circuit on road, in conjunction with Fig. 3, details are as follows：
Sampling unit 21 includes：Multiple equivalence precision resistances are in parallel, in order to facilitate the selection of the varistor of overvoltage protection,
Parallel equivalent resistance is several ohm, for example can select two 5 ohm of resistor coupled in parallel, and equivalent resistance is 2.5 ohm.
Overvoltage protecting unit 22 includes：It is considered as open circuit when being failure to actuate using varistor, and when work is considered as the spy of short circuit
Property, the varistor of different pressure sensitive voltage ranks is in parallel, realizes the destruction that different degrees of breakdown sparking failure is avoided to bring.Root
According to the empirical value range of sparking breakdown current, with reference to the equivalent resistance of sampling unit 21, can select required to be protected
Voltage range, for example the varistor that pressure sensitive voltage rank is 22V and 47V may be used.
Filter unit 23 includes：π type filter units filter out the interference signal as caused by ground connection and working environment.
Signal amplification unit 24 includes：Instrument puts AD620 and its peripheral circuit, realizes the accurate amplification of sampled signal to meet
The range demand of measuring unit.
Overload protection unit 25 includes：Destruction of the overload current to measuring unit module is avoided by varistor realization, together
Overvoltage protecting unit 22 is identical, and selection requirement mainly pressure sensitive voltage, such as 15V are considered as overload voltage, therefore pressure may be selected
Quick voltage level is 18V varistors
Measuring unit 26 includes：PLC measurement modules and oscillograph BNC terminals, do not enable control when being debugged for accelerator
The waveform monitoring of sampled signal and numerical value compare when system directly measures the partial pressure of sampling resistor and realizes accelerator normal operation.
Switch unit 20 includes：Switch and multimeter terminal, it is direct not enable control system when being debugged for accelerator
The electric current for flowing through sampling resistor is measured, sampled signal monitoring and numeric ratio when obtaining its partial pressure and realizing accelerator normal operation
It is right.
It is surveyed in order to further explain ... provided by the present invention for the electric current of insulating core transformer typ high voltage power supply
The physical circuit of circuit is measured, the utility model is further described in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, irradiation accelerator high pressure 300kV, line rated value 40mA.
RZ1, RZ2, RZ3 are varistor, and R1, R2 are filter circuit to measure resistance, C1, L1, C2, and Rg amplifies for instrument
The gain resistor of device AD620.The required pressure sensitive voltage of model selection gist circuit of its varistor, brand
It asks.
Resistance unit 1 is measured as the high current as caused by striking sparks accelerating tube is avoided to cause the high pressure pair at measurement resistance both ends
The damage of late-class circuit, selection measure resistance:R1=R2=5 Ω.
Overvoltage protecting unit 2 selects RZ1 models 10D220KJ, RZ2 model 10D470KJ, pressure-sensitive by this two protection
The attribute of resistance is selected in the range of 8A~20.8A, is measured it is found that according to the empirical value of accelerator high voltage power supply sparking electric current
Resistance terminal voltage is 20V-52V, and protection varistor can effectively play a role.
Filter unit 3 selects suitable cutoff frequency ω=2000rad/s, and damped coefficient δ=0.8 takes C1=C2=
62.5uF L1=4mH.
According to the range 0-10V of PLC controller A/D modules, measure resistance both ends rated voltage is signal amplification unit 4
0.1V selects gain G=80, i.e. instrumentation amplifier output 8V, Rg=625 Ω is acquired by AD620 characteristics.
It is that line is avoided to cross the damage brought that overload protection unit 5, which selects the effect of RZ3 models 10D180KJ, RZ3,
When load current is more than 75mA, amplifier output 15V, protection varistor plays a role.
Multimode measuring unit 6 measures load current in R1 front ends placement banana binding post for multimeter respectively, after RZ3
End placement BNC terminals supply oscilloscope measurement voltage.
The above, because the preferable specific embodiment of the utility model, but the scope of protection of the utility model is not
Be confined to this, it is any be familiar with this technology based on the technical scope that is disclosed in the utility model of technical staff in, according to this practicality
Novel technical solution and its utility model design are subject to equivalent substitution or change, should all cover the protection model in the utility model
In enclosing.
Claims (9)
1. a kind of current measurement circuit for insulating core transformer typ high voltage power supply, which is characterized in that including：It is sequentially connected
Sampling unit (21), Overvoltage protecting unit (22), filter unit (23), signal amplification unit (24), overload protection unit (25)
With measuring unit (26)；
The sampling unit (21) is for collecting work electric current, and the Overvoltage protecting unit (22) is for protection sparking breakdown fault
Destruction to late-class circuit, the filter unit (23) is for being filtered the operating current and eliminate working environment
In interference signal, the signal amplification unit (24) is for amplifying filtered operating current to meet the measuring unit
(26) range requirement, the overload protection unit (25) are exported caused by for avoiding circuit overloads more than the measuring unit
(26) range, the measuring unit (26) are shown for the electric current that measures insulating core transformer typ high voltage power supply and by PLC.
2. current measurement circuit as described in claim 1, which is characterized in that the current measurement circuit further includes：It is arranged on
Switch unit (20) between the sampling unit (21) and high voltage power supply to be measured (1) is used to implement and debugs the stage in accelerator
Not against control system directly with multimeter or oscilloscope measurement voltage division signal, the accelerator operation stage its with rear class oscillograph
BNC measurement terminals and the cooperation of PLC measuring units are mutually authenticated, to monitor and ensure the correctness of measurement result.
3. current measurement circuit as claimed in claim 2, which is characterized in that the switch unit (20) includes：Switch and ten thousand
With table terminal, control system is not enabled when being debugged for accelerator and directly measures the electric current for flowing through sampling resistor, obtains its point
Sampled signal monitoring and numerical value compare when pressure and realization accelerator normal operation.
4. current measurement circuit as described in claim 1, which is characterized in that the sampling unit (21) connects including multiple parallel connections
The sampling resistor connect.
5. current measurement circuit as described in claim 1, which is characterized in that the Overvoltage protecting unit (22) includes：It is multiple
The varistor of different pressure sensitive voltage ranks is in parallel.
6. current measurement circuit as described in claim 1, which is characterized in that the filter unit (23) is single for the filtering of π types
Member.
7. current measurement circuit as described in claim 1, which is characterized in that the signal amplification unit (24) includes：Instrument is put
AD620 and its peripheral circuit.
8. current measurement circuit as described in claim 1, which is characterized in that the overload protection unit (25) includes：It is pressure-sensitive
Resistance, for avoiding destruction of the overload current to measuring unit module.
9. such as claim 1-8 any one of them current measurement circuits, which is characterized in that the measuring unit (26) includes：
PLC measurement modules and oscillograph BNC terminals do not enable point that control system directly measures sampling resistor when being debugged for accelerator
The waveform monitoring of sampled signal and numerical value compare when pressure and realization accelerator normal operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721362323.0U CN207541186U (en) | 2017-10-23 | 2017-10-23 | A kind of current measurement circuit for insulating core transformer typ high voltage power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721362323.0U CN207541186U (en) | 2017-10-23 | 2017-10-23 | A kind of current measurement circuit for insulating core transformer typ high voltage power supply |
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| Publication Number | Publication Date |
|---|---|
| CN207541186U true CN207541186U (en) | 2018-06-26 |
Family
ID=62610693
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721362323.0U Active CN207541186U (en) | 2017-10-23 | 2017-10-23 | A kind of current measurement circuit for insulating core transformer typ high voltage power supply |
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| CN (1) | CN207541186U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107703409A (en) * | 2017-10-23 | 2018-02-16 | 华中科技大学 | A kind of current measurement circuit for insulating core transformer typ high voltage power supply |
| WO2024007902A1 (en) * | 2022-07-07 | 2024-01-11 | 华为技术有限公司 | Isolator, communication device, and communication system |
-
2017
- 2017-10-23 CN CN201721362323.0U patent/CN207541186U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107703409A (en) * | 2017-10-23 | 2018-02-16 | 华中科技大学 | A kind of current measurement circuit for insulating core transformer typ high voltage power supply |
| CN107703409B (en) * | 2017-10-23 | 2024-02-09 | 华中科技大学 | Current measurement circuit for insulating core transformer type high-voltage power supply |
| WO2024007902A1 (en) * | 2022-07-07 | 2024-01-11 | 华为技术有限公司 | Isolator, communication device, and communication system |
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