CN104793045B - A kind of wide-range current frequency converter - Google Patents
A kind of wide-range current frequency converter Download PDFInfo
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- CN104793045B CN104793045B CN201510195809.9A CN201510195809A CN104793045B CN 104793045 B CN104793045 B CN 104793045B CN 201510195809 A CN201510195809 A CN 201510195809A CN 104793045 B CN104793045 B CN 104793045B
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Abstract
The present invention relates to weak current front end reading circuit technical field, especially relate to a kind of converter circuit detecting wide-range current signal and converting thereof into rate-adaptive pacemaker.It is characterized in including and the current signal I of inputinThe integrator being connected, integrator is connected with amplitude discriminator, and amplitude discriminator is connected with impulse generator A；One tunnel of impulse generator A is output as the outfan Output of converter circuit, and another road output of impulse generator A is connected with the input of enumerator；The data output end of enumerator is connected with the input of digital to analog converter, and the overflow position outfan of enumerator is connected with the input of impulse generator B；The outfan of digital to analog converter is connected with the threshold voltage input of amplitude discriminator；The outfan of impulse generator B is connected with the switch of releasing of integrator.This simple in construction, stable performance, measuring circuit that precision is high, the detection for wide-range low current signal provides a kind of novel method and approach.
Description
Technical field
The present invention relates to weak current front end reading circuit technical field, especially relate to a kind of detection wide-range current signal and incite somebody to action
It is converted into the converter circuit of rate-adaptive pacemaker.
Background technology
In heavy-ion cancer therapy device, dose monitoring is the key factor affecting this treatment system.Generally in high-precision spot scan
In treatment system, the low current signal span that the integrating ionization chamber for dose monitoring exports can reach six orders of magnitude, conventional
Current-to-voltage converting circuit cannot process the widest range ability, and its follow-up also need to voltage signal is acquired and
Process, so largely effect on the precision of whole treatment system, stability and ageing, also add treatment cost, shadow simultaneously
Ring therapeutic effect.
Summary of the invention
Present invention aims to the deficiencies in the prior art and a kind of wide-range current frequency converter is provided.Thus solve existing
The problem that technology can not quickly read wide-range exposure dose.
For achieving the above object, the technical scheme that the present invention takes is: described a kind of wide-range current frequency converter, and it is special
Point includes and the current signal I of inputinThe integrator being connected, the outfan of integrator and amplitude discriminator input phase
Connecting, the outfan of amplitude discriminator is connected with the input of impulse generator A；The output of impulse generator A is divided into two-way,
Wherein a road is output as the outfan Output of converter circuit, another road output of impulse generator A and the input of enumerator
It is connected；The data output end of enumerator is connected with the input of digital to analog converter, the overflow position outfan of enumerator and pulse
The input of maker B is connected；The outfan of digital to analog converter is connected with the threshold voltage input of amplitude discriminator；Arteries and veins
The switch of releasing of the outfan and integrator that rush maker B is connected.
Described integrator is by amplifier A1, integrating capacitor C1 and the switch S that releasesHConnect and compose, the inverting input of amplifier A1
With input current signal IinIt is connected；The normal phase input end of amplifier is connected to the ground and connects；The inverting input of amplifier A1 and integration electricity
The one end holding C1 is connected；The outfan of amplifier A1 is connected with the other end of integrating capacitor C1；Amplifier A1 anti-phase defeated
Enter end and the switch S that releasesHOne end be connected；The outfan of amplifier A1 and the switch S that releasesHThe other end be connected；Integration electricity
Hold C1 and the switch S that releasesHForm parallel circuit；Release switch SHThe d type flip flop U7 controlled in end and impulse generator B
Positive output end Q is connected；The outfan of amplifier A1 is connected with the comparator U1 normal phase input end in amplitude discriminator.
Described amplitude discriminator includes comparator U1, and the normal phase input end of comparator U1 is defeated with amplifier A1 in integrator
Go out end to be connected；The inverting input of comparator U1 is connected with the DAC device U6 voltage output end in digital to analog converter；
The outfan of comparator U1 is connected with the d type flip flop U2 input end of clock in impulse generator A.
Described impulse generator A is made up of d type flip flop U2 and door U3 and door U4, resistance R1 and electric capacity C2, D
The input end of clock of trigger U2 is connected with the comparator U1 normal phase input end in amplitude discriminator, the D of d type flip flop U2
End and high level VCCIt is connected；The SET end of d type flip flop U2 and high level VCCIt is connected；The positive of d type flip flop U2
Outfan Q is the outfan Output of this current frequency converter, and the positive output end Q of d type flip flop U2 also with counting
The signal input part of the device U5 in device is connected；The reversed-phase output of d type flip flop U2With an input with door U3
It is connected；Another one input and high level V with door U3CCIt is connected；Outfan and the one of resistance R1 with door U3
End is connected；The other end of resistance R1 is connected with one end of electric capacity C2, and is connected with an input with door U4
Connect；The other end of electric capacity C2 is connected to the ground and connects；Another one input and high level V with door U4CCIt is connected；With door
The outfan of U4 is connected with the clear terminal CLR of d type flip flop U2.
Described enumerator includes device U5, and the signal input part of device U5 is with the d type flip flop U2's in impulse generator A
Positive output end Q is connected；The data of data output end B1～Bi of device U5 and the DAC device U6 in digital to analog converter
Input D1～Di is connected, and wherein i represents number of bits；The Overflow flag outfan CO of device U5 generates with pulse
The input end of clock of the d type flip flop U7 in device B is connected.
Described digital to analog converter includes device DAC device U6, data input pin D1～Di of DAC device U6 and enumerator
In data output end B1～Bi of device U5 be connected；Ratio in the voltage output end of DAC device U6 and amplitude discriminator
The relatively inverting input of device U1 is connected.
Described impulse generator B is made up of d type flip flop U7 and door U8 and door U9, resistance R2 and electric capacity C3, D
The input end of clock of trigger U7 is connected with the Overflow flag outfan CO of the device U5 in enumerator；D type flip flop
The D end of U7 and high level VCCIt is connected；The SET end of d type flip flop U7 and high level VCCIt is connected；D type flip flop U7
Positive output end Q and integrator in releasing switch SHControl end be connected；The reversed-phase output of d type flip flop U7With
It is connected with an input of door U8；Another one input and high level V with door U8CCIt is connected；With door U8's
Outfan is connected with one end of resistance R2；The other end of resistance R2 is connected with one end of electric capacity C3, and with door
One input of U9 is connected；The other end of electric capacity C3 is connected to the ground and connects；With the another one input of door U9 with high
Level VCCIt is connected；It is connected with the clear terminal CLR of d type flip flop U7 with the outfan of door U9.
The requirement that the number of bits i of device U5, DAC device U6 in described enumerator applies according to reality selects.
The invention has the beneficial effects as follows: described a kind of wide-range current frequency converter, its simple in construction, stable performance, essence
Spending high measuring circuit, the detection for wide-range low current signal provides a kind of novel method and approach.This circuit also changes
It is apt to the linearity error that wide-range current signal processes, thus to improve the precision of heavy particle therapy system and ageing, increase
The service efficiency of ion beam, the aspect such as treatment cost reducing patient all have important practical significance.The wide amount of this circuit realiration
Journey electric current is converted to the function of rate-adaptive pacemaker, and the dose monitoring for heavy-ion cancer therapy provides a kind of simple, stable, accurate front end
Process measuring method and circuit.Can be widely applied to the necks such as particle physics experimental detection system and other relevant Nuclear Science and Technology
Territory, as the measurement of wide-range current signal.
Accompanying drawing illustrates:
Fig. 1 is according to circuit theory schematic diagram of the present invention；
Fig. 2 is to connect figure according to physical circuit of the present invention.
Detailed description of the invention
It is described in further detail below in conjunction with the preferred example shown in accompanying drawing:
As illustrated in fig. 1 and 2, described a kind of wide-range current frequency converter, its feature includes and the current signal I of inputin
The integrator being connected, the outfan of integrator is connected with amplitude discriminator input, the outfan of amplitude discriminator
It is connected with the input of impulse generator A；The output of impulse generator A is divided into two-way, and wherein a road is output as transducer electricity
Another road output of the outfan Output on road, impulse generator A is connected with the input of enumerator；The data of enumerator are defeated
Going out end to be connected with the input of digital to analog converter, the overflow position outfan of enumerator is connected with the input of impulse generator B；
The outfan of digital to analog converter is connected with the threshold voltage input of amplitude discriminator；The outfan of impulse generator B and integration
The switch of releasing of device is connected.
Described integrator is by amplifier A1, integrating capacitor C1 and the switch S that releasesHConnect and compose, the inverting input of amplifier A1
With input current signal IinIt is connected；The normal phase input end of amplifier is connected to the ground and connects；The inverting input of amplifier A1 and integration electricity
The one end holding C1 is connected；The outfan of amplifier A1 is connected with the other end of integrating capacitor C1；Amplifier A1 anti-phase defeated
Enter end and the switch S that releasesHOne end be connected；The outfan of amplifier A1 and the switch S that releasesHThe other end be connected；Integration electricity
Hold C1 and the switch S that releasesHForm parallel circuit；Release switch SHThe d type flip flop U7 controlled in end and impulse generator B
Positive output end Q is connected；The outfan of amplifier A1 is connected with the comparator U1 normal phase input end in amplitude discriminator.
Described amplitude discriminator includes comparator U1, and the normal phase input end of comparator U1 is defeated with amplifier A1 in integrator
Go out end to be connected；The inverting input of comparator U1 is connected with the DAC device U6 voltage output end in digital to analog converter；
The outfan of comparator U1 is connected with the d type flip flop U2 input end of clock in impulse generator A.
Described impulse generator A is made up of d type flip flop U2 and door U3 and door U4, resistance R1 and electric capacity C2, D
The input end of clock of trigger U2 is connected with the comparator U1 normal phase input end in amplitude discriminator, the D of d type flip flop U2
End and high level VCCIt is connected；The SET end of d type flip flop U2 and high level VCCIt is connected；The positive of d type flip flop U2
Outfan Q is the outfan Output of this current frequency converter, and the positive output end Q of d type flip flop U2 also with counting
The signal input part of the device U5 in device is connected；The reversed-phase output of d type flip flop U2With an input with door U3
It is connected；Another one input and high level V with door U3CCIt is connected；Outfan and the one of resistance R1 with door U3
End is connected；The other end of resistance R1 is connected with one end of electric capacity C2, and is connected with an input with door U4
Connect；The other end of electric capacity C2 is connected to the ground and connects；Another one input and high level V with door U4CCIt is connected；With door
The outfan of U4 is connected with the clear terminal CLR of d type flip flop U2.
Described enumerator includes device U5, and the signal input part of device U5 is with the d type flip flop U2's in impulse generator A
Positive output end Q is connected；The data of data output end B1～Bi of device U5 and the DAC device U6 in digital to analog converter
Input D1～Di is connected, and wherein i represents number of bits；The Overflow flag outfan CO of device U5 generates with pulse
The input end of clock of the d type flip flop U7 in device B is connected.
Described digital to analog converter includes device DAC device U6, data input pin D1～Di of DAC device U6 and enumerator
In data output end B1～Bi of device U5 be connected；Ratio in the voltage output end of DAC device U6 and amplitude discriminator
The relatively inverting input of device U1 is connected.
Described impulse generator B is made up of d type flip flop U7 and door U8 and door U9, resistance R2 and electric capacity C3, D
The input end of clock of trigger U7 is connected with the Overflow flag outfan CO of the device U5 in enumerator；D type flip flop
The D end of U7 and high level VCCIt is connected；The SET end of d type flip flop U7 and high level VCCIt is connected；D type flip flop U7
Positive output end Q and integrator in releasing switch SHControl end be connected；The reversed-phase output of d type flip flop U7With
It is connected with an input of door U8；Another one input and high level V with door U8CCIt is connected；With door U8's
Outfan is connected with one end of resistance R2；The other end of resistance R2 is connected with one end of electric capacity C3, and with door
One input of U9 is connected；The other end of electric capacity C3 is connected to the ground and connects；With the another one input of door U9 with high
Level VCCIt is connected；It is connected with the clear terminal CLR of d type flip flop U7 with the outfan of door U9.
The requirement that the number of bits i of device U5, DAC device U6 in described enumerator applies according to reality selects.
Described a kind of wide-range current frequency converter, it mainly uses high accuracy integrator, highly sensitive comparator, DAC device
Part, counter device, d type flip flop are constituted with the device such as door, and current signal is converted into voltage signal by integrator, comparator
Comparing with the voltage signal of DAC output, form pulse signal at outfan, unison counter pulse signals counts
Cumulative, and change the voltage of DAC outfan and then change the threshold voltage of comparator.This power frequency change-over circuit possess pA～
The detection of low current signal and readability in six order of magnitude ranges of μ A, enter with the two of DAC device by changing enumerator
Figure place processed, thus adjust the resolution capability of whole circuit.Monitor in real time for the irradiation dose in heavy-ion cancer therapy system and provide one
Plant method and means fast and accurately, simplify the complexity of existing weak current measuring method and experimental measurement system, and carry
High certainty of measurement and linear index.Current signal is directly converted to pulse duration frequency signal output by this circuit, straight for current signal
Switch through chemical conversion digital quantity and provide a kind of new approach.
Described a kind of wide-range current frequency converter, can be single channel design, it is also possible to multi-passage design；In meeting property
Under conditions of requiring, the device of different encapsulated type can be selected；According to different performance indications, different value can be selected
Resistance capacitor device.During its work, by the current signal I of inputinElectric capacity C1 upper integral at integrator forms voltage signal,
The threshold voltage that the voltage signal entrance comparator of integrator output exports with DAC device compares, when the voltage letter of integrator output
During number more than the threshold voltage of DAC device output, it is simply that produces one rising edge signal, the entrance pulse generation of this rising edge signal
In device A, the RC circuit of R1 and the C2 composition in pulse generator A forms pulse signal after high level keeps the regular hour
Output.The pulse number that pulse generator A is exported by enumerator U5 counts, and the result of counting is exported digital to analog converter
In U6, when umber of pulse increases by one, the analog voltage signal VO correspondence of analog-digital converter output increases, such comparator U1's
Threshold voltage is also corresponding to be increased.When the overflow position of enumerator U5 is high level, corresponding in integrating capacitor C1 of integrator
Voltage reaches saturation, it is necessary to release integrating capacitor C1, and pulse generator B is according to the overflow position high level of enumerator
Signal produces the switch Guan Bi of releasing of a pulse signal control integrator and releases, and duration of releasing is determined by R2 and C3.Should
The work that circuit so goes round and begins again, it is achieved that wide-range electric current is converted to the function of frequency.
In the present embodiment, integration time constant can be changed by changing the capacitance of integrating capacitor C1, improve certainty of measurement；
The capacitance changing integrating capacitor C1 can also change the range of circuit.Select the enumerator of different number of bits and different resolution
DAC device, thus it is possible to vary output frequency.Select different R1 and C2 values, the width of output pulse can be regulated.Select
Different R2 and C3 values, can regulate releasing the time of integrator.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all the spirit and principles in the present invention it
In, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (5)
1. a wide-range current frequency converter, its feature includes and the current signal of inputI inThe integrator being connected, the outfan of integrator is connected with amplitude discriminator input, and the outfan of amplitude discriminator is connected with the input of impulse generator A；The output of impulse generator A is divided into two-way, and wherein a road is output as the outfan Output of converter circuit, and another road output of impulse generator A is connected with the input of enumerator；The data output end of enumerator is connected with the input of digital to analog converter, and the overflow position outfan of enumerator is connected with the input of impulse generator B；The outfan of digital to analog converter is connected with the threshold voltage input of amplitude discriminator；The outfan of impulse generator B is connected with the switch of releasing of integrator；Described impulse generator A is made up of d type flip flop U2 and door U3 and door U4, resistance R1 and electric capacity C2, the D end of d type flip flop U2 and high level VCCIt is connected；The SET end of d type flip flop U2 and high level VCCIt is connected；The outfan Output that positive output end Q is this current frequency converter of d type flip flop U2, and the positive output end Q of d type flip flop U2 also signal input part with the device U5 in enumerator is connected；The reversed-phase output of d type flip flop U2 is connected with an input with door U3；Another one input and high level V with door U3CCIt is connected；It is connected with one end of resistance R1 with the outfan of door U3；The other end of resistance R1 is connected with one end of electric capacity C2, and is connected with an input with door U4；The other end of electric capacity C2 is connected to the ground and connects；Another one input and high level V with door U4CCIt is connected；It is connected with the clear terminal CLR of d type flip flop U2 with the outfan of door U4；Described impulse generator B is made up of d type flip flop U7 and door U8 and door U9, resistance R2 and electric capacity C3, and the input end of clock of d type flip flop U7 is connected with the Overflow flag outfan CO of the device U5 in enumerator；The D end of d type flip flop U7 and high level VCCIt is connected；The SET end of d type flip flop U7 and high level VCCIt is connected；The positive output end Q of d type flip flop U7 and the switch S that releases in integratorHControl end be connected；The reversed-phase output of d type flip flop U7 is connected with an input with door U8；Another one input and high level V with door U8CCIt is connected；It is connected with one end of resistance R2 with the outfan of door U8；The other end of resistance R2 is connected with one end of electric capacity C3, and is connected with an input with door U9；The other end of electric capacity C3 is connected to the ground and connects；Another one input and high level V with door U9CCIt is connected；It is connected with the clear terminal CLR of d type flip flop U7 with the outfan of door U9；Described amplitude discriminator includes that comparator U1, the normal phase input end of comparator U1 are connected with the outfan of amplifier A1 in integrator；The inverting input of comparator U1 is connected with the DAC device U6 voltage output end in digital to analog converter；The outfan of comparator U1 is connected with the d type flip flop U2 input end of clock in impulse generator A.
2. a kind of wide-range current frequency converter as claimed in claim 1, it is characterised in that: described integrator is by amplifier A1, integrating capacitor C1 and the switch S that releasesHConstitute, the inverting input of amplifier A1 and input current signalI inIt is connected；The normal phase input end of amplifier is connected to the ground and connects；The inverting input of amplifier A1 is connected with one end of integrating capacitor C1；The outfan of amplifier A1 is connected with the other end of integrating capacitor C1；The inverting input of amplifier A1 and the switch S that releasesHOne end be connected；The outfan of amplifier A1 and the switch S that releasesHThe other end be connected；Integrating capacitor C1 and the switch S that releasesHForm parallel circuit；Release switch SHControl end be connected with the d type flip flop U7 positive output end Q in impulse generator B；The outfan of amplifier A1 is connected with the comparator U1 normal phase input end in amplitude discriminator.
3. a kind of wide-range current frequency converter as claimed in claim 1, it is characterised in that: described enumerator includes that device U5, the signal input part of device U5 are connected with the positive output end Q of the d type flip flop U2 in impulse generator A；Data output end B1～Bi of device U5 is connected with data input pin D1～Di of the DAC device U6 in digital to analog converter, and wherein i represents number of bits；The input end of clock of the Overflow flag outfan CO and the d type flip flop U7 in impulse generator B of device U5 is connected.
4. a kind of wide-range current frequency converter as claimed in claim 1, it is characterised in that: described digital to analog converter includes that device DAC device U6, data input pin D1～Di of DAC device U6 are connected with data output end B1～Bi of the device U5 in enumerator；The voltage output end of DAC device U6 is connected with the inverting input of the comparator U1 in amplitude discriminator.
5. a kind of wide-range current frequency converter as claimed in claim 4, it is characterised in that: the requirement that the number of bits i of device U5, DAC device U6 in described enumerator applies according to reality selects.
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| CN106707009B (en) * | 2016-12-30 | 2020-11-13 | 南京理工大学 | Wide-range high-precision current statistical circuit |
| CN107703351B (en) * | 2017-09-27 | 2020-12-04 | 成都兴睿宝电子科技有限公司 | Large dynamic micro-current detection circuit |
| US20210181242A1 (en) * | 2017-12-09 | 2021-06-17 | Dongguan Bang Bang Tang Electronic Technologies Co., Ltd. | Current sensor for biomedical measurements |
| CN109633251B (en) * | 2018-11-20 | 2021-03-16 | 湖南航天机电设备与特种材料研究所 | IF circuit integral voltage peak-to-peak value solving method and device |
| CN111239707B (en) * | 2018-11-28 | 2023-02-03 | 湖北华中长江光电科技有限公司 | Human eye safety double-wave gate laser detection device |
| CN111400074A (en) * | 2019-01-02 | 2020-07-10 | 珠海格力电器股份有限公司 | Watchdog simulating device and control method thereof |
| CN110492882B (en) * | 2019-09-03 | 2024-06-18 | 中国电子科技集团公司第四十三研究所 | High-precision current/frequency conversion circuit for stretching reset |
| CN112213554B (en) * | 2020-09-04 | 2021-12-21 | 中国原子能科学研究院 | Weak current measuring circuit and method based on current frequency conversion method |
| CN113295911A (en) * | 2021-05-25 | 2021-08-24 | 中国核动力研究设计院 | Nuclear instrument system micro-current measuring method and processing device based on current conversion frequency |
| CN114217122A (en) * | 2021-11-23 | 2022-03-22 | 黑龙江省原子能研究院 | Capacitance integral weak current measuring I/F conversion circuit |
| CN114859393B (en) * | 2022-04-26 | 2023-02-03 | 中国科学院近代物理研究所 | Radiotherapy dose monitoring device with self-recovery function |
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| CN204964614U (en) * | 2015-04-23 | 2016-01-13 | 中国科学院近代物理研究所 | Wide -range electric current frequency converter |
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| JPH0654331B2 (en) * | 1986-03-12 | 1994-07-20 | 富士電機株式会社 | Power converter voltage and current detection method |
| CN2044074U (en) * | 1988-12-28 | 1989-09-06 | 刘运中 | Current frequency converter for electronic electric energy meter |
| JP2001141753A (en) * | 1999-11-16 | 2001-05-25 | Fujio Ozawa | Current and electric quantity measuring circuit |
| US7952343B2 (en) * | 2005-12-15 | 2011-05-31 | Chimei Innolux Corporation | Current measurement circuit and method |
| CN103713181B (en) * | 2013-12-30 | 2016-03-09 | 重庆华渝电气集团有限公司 | Weak current signal supervisory instrument |
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| CN204964614U (en) * | 2015-04-23 | 2016-01-13 | 中国科学院近代物理研究所 | Wide -range electric current frequency converter |
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