CN104793045A - Wide-range current frequency converter - Google Patents
Wide-range current frequency converter Download PDFInfo
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- CN104793045A CN104793045A CN201510195809.9A CN201510195809A CN104793045A CN 104793045 A CN104793045 A CN 104793045A CN 201510195809 A CN201510195809 A CN 201510195809A CN 104793045 A CN104793045 A CN 104793045A
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Abstract
The invention relates to the technical field of weak front-end reading-out circuits, in particular to a converter circuit for detecting wide-range current signals and converting the same into frequency for outputting. The converter circuit is characterized by comprising an integrator connected with an input current signal Iin, the integrator is connected with an amplitude discriminator which is connected with a pulse generator A, one output branch of the pulse generator A serves as an output end Output of the converter circuit while the other output branch of the same is connected with an input end of a counter, a data output end of the counter is connected with an input end of a digital-analog converter, an overflow position output end of the counter is connected with an input end of a pulse generator B, an output end of the digital-analog converter is connected with a threshold voltage input end of the amplitude discriminator, and an output end of the pulse generator B is connected with a release switch of the integrator. The converter circuit is a measuring circuit which is simple in structure, stable in performance and high in accuracy, and a novel method and approach is provided for detection of wide-range weak current signals.
Description
Technical field
The present invention relates to weak current front end sensing circuit technical field, especially relate to and a kind ofly detect wide-range current signal and convert thereof into the converter circuit of rate-adaptive pacemaker.
Background technology
In heavy-ion cancer therapy device, dose monitoring is the key factor affecting this therapy system.Usually in high-precision spot scan therapy system, the low current signal span exported for the integrating ionization chamber of dose monitoring can reach six orders of magnitude, conventional current-to-voltage converting circuit cannot process so wide range ability, and its follow-up also needs carries out acquisition and processing to voltage signal, so greatly have influence on the precision of whole therapy system, stability and ageing, also add treatment cost simultaneously, affect result for the treatment of.
Summary of the invention
The object of the invention is to provide a kind of wide-range current frequency converter for the deficiencies in the prior art.Thus solve the problem that prior art can not read wide-range exposure dose fast.
For achieving the above object, the technical scheme that the present invention takes is: described a kind of wide-range current frequency converter, and its feature comprises the current signal I with input
inthe integrator be connected, the output terminal of integrator is connected with amplitude discriminator input end, and the output terminal of amplitude discriminator is connected with the input end of impulse generator A; The output of impulse generator A is divided into two-way, and wherein a road exports the output terminal Output for converter circuit, and another road of impulse generator A exports and is connected with the input end of counter; The data output end of counter is connected with the input end of digital to analog converter, and the overflow position output terminal of counter is connected with the input end of impulse generator B; The output terminal of digital to analog converter is connected with the threshold voltage input end of amplitude discriminator; The output terminal of impulse generator B is connected with the switch of releasing of integrator.
Described integrator is by amplifier A1, integrating capacitor C1 and switch S of releasing
hconnect and compose, the inverting input of amplifier A1 and input current signal I
inbe 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 output terminal of amplifier A1 is connected with the other end of integrating capacitor C1; The inverting input of amplifier A1 and switch S of releasing
hone end be connected; The output terminal of amplifier A1 and switch S of releasing
hthe other end be connected; Integrating capacitor C1 and switch S of releasing
hform parallel circuit; To release switch S
hcontrol end be connected with the d type flip flop U7 positive output end Q in impulse generator B; The output terminal of amplifier A1 is connected with the comparer U1 normal phase input end in amplitude discriminator.
Described amplitude discriminator comprises comparer U1, and the normal phase input end of comparer U1 is connected with the output terminal of the amplifier A1 in integrator; The inverting input of comparer U1 is connected with the DAC device U6 voltage output end in digital to analog converter; The output terminal of comparer U1 is connected with the d type flip flop U2 input end of clock in impulse generator A.
Described impulse generator A is by d type flip flop U2, form with door U3, with door U4, resistance R1 and electric capacity C2, and the input end of clock of d type flip flop U2 is connected with the comparer U1 normal phase input end in amplitude discriminator, the D end of d type flip flop U2 and high level V
cCbe connected; SET end and the high level V of d type flip flop U2
cCbe connected; The positive output end Q of d type flip flop U2 is the output terminal Output of this current frequency converter, and the positive output end Q of d type flip flop U2 is also connected with the signal input part of the device U5 in counter; The reversed-phase output of d type flip flop U2
be connected with an input end of door U3; With another one input end and the high level V of door U3
cCbe connected; Be connected with one end of resistance R1 with the output terminal of door U3; Other one end of resistance R1 is connected with one end of electric capacity C2, and is connected with an input end of door U4; Other one end of electric capacity C2 is connected to the ground and connects; With another one input end and the high level V of door U4
cCbe connected; Be connected with the clear terminal CLR of d type flip flop U2 with the output terminal of door U4.
Described counter comprises device U5, and the signal input part of device U5 is connected with the positive output end Q of the d type flip flop U2 in impulse generator A; Data output end B1 ~ the Bi of device U5 is connected with the data input pin D1 ~ Di of the DAC device U6 in digital to analog converter, and wherein i represents number of bits; The Overflow flag output terminal CO of device U5 is connected with the input end of clock of the d type flip flop U7 in impulse generator B.
Described digital to analog converter comprises device DAC device U6, and the data input pin D1 ~ Di of DAC device U6 is connected with the data output end B1 ~ Bi of the device U5 in counter; The voltage output end of DAC device U6 is connected with the inverting input of the comparer U1 in amplitude discriminator.
Described impulse generator B is by d type flip flop U7, form with door U8, with 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 output terminal CO of the device U5 in counter; D end and the high level V of d type flip flop U7
cCbe connected; SET end and the high level V of d type flip flop U7
cCbe connected; Switch S of releasing in the positive output end Q of d type flip flop U7 and integrator
hcontrol end be connected; The reversed-phase output of d type flip flop U7
be connected with an input end of door U8; With another one input end and the high level V of door U8
cCbe connected; Be connected with one end of resistance R2 with the output terminal of door U8; Other one end of resistance R2 is connected with one end of electric capacity C3, and is connected with an input end of door U9; Other one end of electric capacity C3 is connected to the ground and connects; With another one input end and the high level V of door U9
cCbe connected; Be connected with the clear terminal CLR of d type flip flop U7 with the output terminal of door U9.
The number of bits i of device U5, DAC device U6 in described counter selects according to the requirement of practical application.
The invention has the beneficial effects as follows: described a kind of wide-range current frequency converter, its structure be simple, stable performance, metering circuit that precision is high, the detection for wide-range low current signal provides a kind of novel methods and direction.This circuit further improves the linear error of wide-range current signal process, thus to improve the precision of heavy particle therapy system and ageing, to increase ion beam service efficiency, the aspect such as treatment cost that reduces patient all has important practical significance.This circuit realiration wide-range 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 processing measuring method and circuit.The field such as particle physics experimental detection system and other relevant Nuclear Science and Technology can be widely used in, 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 according to physical circuit connection layout of the present invention.
Embodiment
Below in conjunction with accompanying drawing shownschematically preferred example be described in further detail:
As illustrated in fig. 1 and 2, described a kind of wide-range current frequency converter, its feature comprises the current signal I with input
inthe integrator be connected, the output terminal of integrator is connected with amplitude discriminator input end, and the output terminal of amplitude discriminator is connected with the input end of impulse generator A; The output of impulse generator A is divided into two-way, and wherein a road exports the output terminal Output for converter circuit, and another road of impulse generator A exports and is connected with the input end of counter; The data output end of counter is connected with the input end of digital to analog converter, and the overflow position output terminal of counter is connected with the input end of impulse generator B; The output terminal of digital to analog converter is connected with the threshold voltage input end of amplitude discriminator; The output terminal of impulse generator B is connected with the switch of releasing of integrator.
Described integrator is by amplifier A1, integrating capacitor C1 and switch S of releasing
hconnect and compose, the inverting input of amplifier A1 and input current signal I
inbe 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 output terminal of amplifier A1 is connected with the other end of integrating capacitor C1; The inverting input of amplifier A1 and switch S of releasing
hone end be connected; The output terminal of amplifier A1 and switch S of releasing
hthe other end be connected; Integrating capacitor C1 and switch S of releasing
hform parallel circuit; To release switch S
hcontrol end be connected with the d type flip flop U7 positive output end Q in impulse generator B; The output terminal of amplifier A1 is connected with the comparer U1 normal phase input end in amplitude discriminator.
Described amplitude discriminator comprises comparer U1, and the normal phase input end of comparer U1 is connected with the output terminal of the amplifier A1 in integrator; The inverting input of comparer U1 is connected with the DAC device U6 voltage output end in digital to analog converter; The output terminal of comparer U1 is connected with the d type flip flop U2 input end of clock in impulse generator A.
Described impulse generator A is by d type flip flop U2, form with door U3, with door U4, resistance R1 and electric capacity C2, and the input end of clock of d type flip flop U2 is connected with the comparer U1 normal phase input end in amplitude discriminator, the D end of d type flip flop U2 and high level V
cCbe connected; SET end and the high level V of d type flip flop U2
cCbe connected; The positive output end Q of d type flip flop U2 is the output terminal Output of this current frequency converter, and the positive output end Q of d type flip flop U2 is also connected with the signal input part of the device U5 in counter; The reversed-phase output of d type flip flop U2
be connected with an input end of door U3; With another one input end and the high level V of door U3
cCbe connected; Be connected with one end of resistance R1 with the output terminal of door U3; Other one end of resistance R1 is connected with one end of electric capacity C2, and is connected with an input end of door U4; Other one end of electric capacity C2 is connected to the ground and connects; With another one input end and the high level V of door U4
cCbe connected; Be connected with the clear terminal CLR of d type flip flop U2 with the output terminal of door U4.
Described counter comprises device U5, and the signal input part of device U5 is connected with the positive output end Q of the d type flip flop U2 in impulse generator A; Data output end B1 ~ the Bi of device U5 is connected with the data input pin D1 ~ Di of the DAC device U6 in digital to analog converter, and wherein i represents number of bits; The Overflow flag output terminal CO of device U5 is connected with the input end of clock of the d type flip flop U7 in impulse generator B.
Described digital to analog converter comprises device DAC device U6, and the data input pin D1 ~ Di of DAC device U6 is connected with the data output end B1 ~ Bi of the device U5 in counter; The voltage output end of DAC device U6 is connected with the inverting input of the comparer U1 in amplitude discriminator.
Described impulse generator B is by d type flip flop U7, form with door U8, with 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 output terminal CO of the device U5 in counter; D end and the high level V of d type flip flop U7
cCbe connected; SET end and the high level V of d type flip flop U7
cCbe connected; Switch S of releasing in the positive output end Q of d type flip flop U7 and integrator
hcontrol end be connected; The reversed-phase output of d type flip flop U7
be connected with an input end of door U8; With another one input end and the high level V of door U8
cCbe connected; Be connected with one end of resistance R2 with the output terminal of door U8; Other one end of resistance R2 is connected with one end of electric capacity C3, and is connected with an input end of door U9; Other one end of electric capacity C3 is connected to the ground and connects; With another one input end and the high level V of door U9
cCbe connected; Be connected with the clear terminal CLR of d type flip flop U7 with the output terminal of door U9.
The number of bits i of device U5, DAC device U6 in described counter selects according to the requirement of practical application.
Described a kind of wide-range current frequency converter, it mainly adopts high precision integrator, highly sensitive comparer, DAC device, counter device, d type flip flop and forms with devices such as doors, integrator converts current signal to voltage signal, the voltage signal that comparer and DAC export compares, pulse signal is formed at output terminal, unison counter pulse signals is carried out counting and is added up, and changes the voltage of DAC output terminal and then change the threshold voltage of comparer.This power frequency change-over circuit possesses detection and the readout capacity of low current signal in pA ~ μ A six order of magnitude ranges, by changing the number of bits of counter and DAC device, thus adjusts the resolution characteristic of whole circuit.For the irradiation dose Real-Time Monitoring in heavy-ion cancer therapy system provides one method and means fast and accurately, simplify the complicacy of existing weak current measuring method and experimental measurement system, and improve measuring accuracy and linear index.Current signal is directly converted to pulse duration frequency signal and exports by this circuit, provides a kind of new approach for current signal directly changes into digital quantity.
Described a kind of wide-range current frequency converter can be single channel design, also can multi-passage design; Under the condition meeting performance requirement, the device of different encapsulated type can be selected; According to different performance index, the resistance capacitor device of different value can be selected.During its work, by the current signal I of input
inat the electric capacity C1 upper integral coating-forming voltage signal of integrator, the voltage signal that integrator exports enters comparer and compares with the threshold voltage that DAC device exports, when the voltage signal that integrator exports is greater than the threshold voltage of DAC device output, be exactly produce a rising edge signal, this rising edge signal enters in pulse producer A, forms output of pulse signal after high level is kept the regular hour by the RC circuit that R1 and C2 in pulse producer A forms.The pulse number that counter U5 paired pulses generator A exports counts, the result of counting is outputted in digital to analog converter U6, when umber of pulse increases by one, the analog voltage signal VO correspondence that analog to digital converter exports increases, and the threshold voltage of such comparer U1 is also corresponding to be increased.When the overflow position of counter U5 is high level, to reach capacity state corresponding to the voltage on the integrating capacitor C1 of integrator, must release to integrating capacitor C1, pulse producer B produces pulse signal according to the overflow position high level signal of counter and controls that the switch of releasing of integrator is closed releases, and duration of releasing is determined by R2 and C3.The work that this circuit goes round and begins again like this, achieves the function that wide-range electric current is converted to frequency.
In the present embodiment, can integration time constant be changed by the capacitance changing integrating capacitor C1, improve measuring accuracy; The capacitance changing integrating capacitor C1 also can change the range of circuit.Select the counter of different number of bits and the different DAC device differentiated, can output frequency be changed.Select different R1 and C2 values, can the width of regulation output pulse.Select different R2 and C3 values, releasing the time of integrator can be regulated.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a wide-range current frequency converter, its feature comprises the current signal I with input
inthe integrator be connected, the output terminal of integrator is connected with amplitude discriminator input end, and the output terminal of amplitude discriminator is connected with the input end of impulse generator A; The output of impulse generator A is divided into two-way, and wherein a road exports the output terminal Output for converter circuit, and another road of impulse generator A exports and is connected with the input end of counter; The data output end of counter is connected with the input end of digital to analog converter, and the overflow position output terminal of counter is connected with the input end of impulse generator B; The output terminal of digital to analog converter is connected with the threshold voltage input end of amplitude discriminator; The output terminal of impulse generator B is connected with the switch of releasing of integrator.
2. a kind of wide-range current frequency converter as claimed in claim 1, is characterized in that: described integrator is by amplifier A1, integrating capacitor C1 and switch S of releasing
hform, the inverting input of amplifier A1 and input current signal I
inbe 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 output terminal of amplifier A1 is connected with the other end of integrating capacitor C1; The inverting input of amplifier A1 and switch S of releasing
hone end be connected; The output terminal of amplifier A1 and switch S of releasing
hthe other end be connected; Integrating capacitor C1 and switch S of releasing
hform parallel circuit; To release switch S
hcontrol end be connected with the d type flip flop U7 positive output end Q in impulse generator B; The output terminal of amplifier A1 is connected with the comparer U1 normal phase input end in amplitude discriminator.
3. a kind of wide-range current frequency converter as claimed in claim 1, it is characterized in that: described amplitude discriminator comprises comparer U1, the normal phase input end of comparer U1 is connected with the output terminal of the amplifier A1 in integrator; The inverting input of comparer U1 is connected with the DAC device U6 voltage output end in digital to analog converter; The output terminal of comparer U1 is connected with the d type flip flop U2 input end of clock in impulse generator A.
4. a kind of wide-range current frequency converter as claimed in claim 1, it is characterized in that: described impulse generator A is by d type flip flop U2, form with door U3, with door U4, resistance R1 and electric capacity C2, the input end of clock of d type flip flop U2 is connected with the comparer U1 normal phase input end in amplitude discriminator, D end and the high level V of d type flip flop U2
cCbe connected; SET end and the high level V of d type flip flop U2
cCbe connected; The positive output end Q of d type flip flop U2 is the output terminal Output of this current frequency converter, and the positive output end Q of d type flip flop U2 is also connected with the signal input part of the device U5 in counter; The reversed-phase output of d type flip flop U2
be connected with an input end of door U3; With another one input end and the high level V of door U3
cCbe connected; Be connected with one end of resistance R1 with the output terminal of door U3; Other one end of resistance R1 is connected with one end of electric capacity C2, and is connected with an input end of door U4; Other one end of electric capacity C2 is connected to the ground and connects; With another one input end and the high level V of door U4
cCbe connected; Be connected with the clear terminal CLR of d type flip flop U2 with the output terminal of door U4.
5. a kind of wide-range current frequency converter as claimed in claim 1, is characterized in that: described counter comprises device U5, and the signal input part of device U5 is connected with the positive output end Q of the d type flip flop U2 in impulse generator A; Data output end B1 ~ the Bi of device U5 is connected with the data input pin D1 ~ Di of the DAC device U6 in digital to analog converter, and wherein i represents number of bits; The Overflow flag output terminal CO of device U5 is connected with the input end of clock of the d type flip flop U7 in impulse generator B.
6. a kind of wide-range current frequency converter as claimed in claim 1, it is characterized in that: described digital to analog converter comprises device DAC device U6, and the data input pin D1 ~ Di of DAC device U6 is connected with the data output end B1 ~ Bi of the device U5 in counter; The voltage output end of DAC device U6 is connected with the inverting input of the comparer U1 in amplitude discriminator.
7. a kind of wide-range current frequency converter as claimed in claim 1, it is characterized in that: described impulse generator B is by d type flip flop U7, form with door U8, with 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 output terminal CO of the device U5 in counter; D end and the high level V of d type flip flop U7
cCbe connected; SET end and the high level V of d type flip flop U7
cCbe connected; Switch S of releasing in the positive output end Q of d type flip flop U7 and integrator
hcontrol end be connected; The reversed-phase output of d type flip flop U7
be connected with an input end of door U8; With another one input end and the high level V of door U8
cCbe connected; Be connected with one end of resistance R2 with the output terminal of door U8; Other one end of resistance R2 is connected with one end of electric capacity C3, and is connected with an input end of door U9; Other one end of electric capacity C3 is connected to the ground and connects; With another one input end and the high level V of door U9
cCbe connected; Be connected with the clear terminal CLR of d type flip flop U7 with the output terminal of door U9.
8. a kind of wide-range current frequency converter as claimed in claim 6, is characterized in that: the number of bits i of device U5, DAC device U6 in described counter selects according to the requirement of practical application.
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| CN201510195809.9A CN104793045B (en) | 2015-04-23 | 2015-04-23 | A kind of wide-range current frequency converter |
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| CN104793045B CN104793045B (en) | 2016-10-26 |
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| CN107703351A (en) * | 2017-09-27 | 2018-02-16 | 成都兴睿宝电子科技有限公司 | A kind of Larger Dynamic micro-current sensing circuit |
| CN109633251A (en) * | 2018-11-20 | 2019-04-16 | 湖南航天机电设备与特种材料研究所 | A kind of I/F circuit integral voltage peak-to-peak value method for solving and device |
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| CN110492882A (en) * | 2019-09-03 | 2019-11-22 | 中国电子科技集团公司第四十三研究所 | A kind of broadening reset high-precision current/freq converting circuit |
| CN112213554A (en) * | 2020-09-04 | 2021-01-12 | 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 |
| CN114859393A (en) * | 2022-04-26 | 2022-08-05 | 中国科学院近代物理研究所 | Radiotherapy dose monitoring device with self-recovery function |
| 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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