CN103471301B - A kind of constant refrigeration control circuit of handheld X-ray fluorescence spectrometer - Google Patents
A kind of constant refrigeration control circuit of handheld X-ray fluorescence spectrometer Download PDFInfo
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- CN103471301B CN103471301B CN201310394014.1A CN201310394014A CN103471301B CN 103471301 B CN103471301 B CN 103471301B CN 201310394014 A CN201310394014 A CN 201310394014A CN 103471301 B CN103471301 B CN 103471301B
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 18
- 238000004876 x-ray fluorescence Methods 0.000 title claims abstract description 9
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
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- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention discloses a kind of constant refrigeration control circuit of handheld X-ray fluorescence spectrometer, comprise sensor I/O interface module, the connector of described sensor I/O interface module connects the positive input terminal of the operational amplifier in filtering and amplifying circuit, the positive input terminal of operational amplifier is connected in parallel R3 and C11, the R3 other end connects voltage, the negative input end of operational amplifier is connected in parallel R15 and R18, the output of R18 other end concatenation operation amplifier, the output of operational amplifier connects R5, R5 is connected in parallel C12 and R6, R6 is connected in parallel R11, C13 and diode A1, C12, R11 and C13 other end ground connection, diode A1 is connected in parallel refrigeration module.The present invention is novel in design, and structure is simple, provides constant refrigerating function, improve the resolution ratio of electronics to SDD detector.
Description
Technical field
The present invention relates to a kind of refrigeration circuit, what be specifically related to is a kind of constant refrigeration control circuit of handheld X-ray fluorescence spectrometer.
Background technology
SDD detector is the core component of typical X-ray XRF, is similar to photodiode, but it have employed stagged electrode structure, and it can carry out the spectrometry of X-ray under higher counting rate, but it needs constant refrigerating function.
Summary of the invention
The object of the invention is to the above problem overcoming prior art existence, a kind of constant refrigeration control circuit of handheld X-ray fluorescence spectrometer is provided, the refrigeration that SDD detector is constant can be given.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
A kind of constant refrigeration control circuit of handheld X-ray fluorescence spectrometer, comprise sensor I/O interface module, the TEMP port of the J6 connector of described sensor I/O interface module connects the positive input terminal of the operational amplifier in filtering and amplifying circuit, the positive input terminal of described operational amplifier is connected in parallel resistance R3 and electric capacity C11, the described resistance R3 other end connects voltage, the negative input end of described operational amplifier is connected in parallel resistance R15 and R18, the described R18 other end connects the output of described operational amplifier, the output contact resistance R5 of described operational amplifier, described resistance R5 is connected in parallel electric capacity C12 and resistance R6, described resistance R6 is connected in parallel resistance R11, electric capacity C13 and diode A1, described electric capacity C12, resistance R11 and electric capacity C13 other end ground connection, described diode A1 is connected in parallel 9 pin and the diode D3 of the chip U1 of refrigeration module.
Further, 14 pin of described chip U1 are connected in parallel L1, C3, C4, the described L1 other end connects power source voltage Vcc, described C3, C4 ground connection, 13 pin of described chip U1 connect 14 pin, 12 pin connect 14 pin by resistance R2, the 10 pin shunt capacitance C14 of described chip U1 and resistance R9, the described resistance R9 other end connects electric capacity C17, the other end ground connection of described electric capacity C14 and described electric capacity C17, 6 pin of described chip U1 connect ground connection after electric capacity C18, ground connection after 8 pin connecting resistance R20, 1 pin of described chip U1 is connected 5 pin with 2 pin by electric capacity C1, C8 is connected in parallel after the 2 pin connection L2 of described chip U1, C9, L3 and R7, the other end of described C8 with C9 is connected, described R7 is connected in parallel R17 and Q2, described L3 is connected in parallel C6 and C5, described C6 and C5 other end ground connection, 7 pin of described chip U1 are connected in parallel R8, C7 and described C8, by ground connection after R16 after described R8 with the C7 other end is connected.
The invention has the beneficial effects as follows:
The present invention is novel in design, and structure is simple, provides constant refrigerating function, improve the resolution ratio of electronics to SDD detector.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of module 1 and module 2;
Fig. 2 is the circuit diagram of module 3.
Number in the figure illustrates: 1, sensor I/O interface module, 2, filtering and amplifying circuit, 3, refrigeration module.
Detailed description of the invention
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
With reference to shown in Fig. 1, a kind of constant refrigeration control circuit of handheld X-ray fluorescence spectrometer, comprise sensor I/O interface module 1, the TEMP port of the J6 connector of described sensor I/O interface module 1 connects the positive input terminal of the operational amplifier in filtering and amplifying circuit 2, the positive input terminal of described operational amplifier is connected in parallel resistance R3 and electric capacity C11, the described resistance R3 other end connects voltage, the negative input end of described operational amplifier is connected in parallel resistance R15 and R18, the described R18 other end connects the output of described operational amplifier, the output contact resistance R5 of described operational amplifier, described resistance R5 is connected in parallel electric capacity C12 and resistance R6, described resistance R6 is connected in parallel resistance R11, electric capacity C13 and diode A1, described electric capacity C12, resistance R11 and electric capacity C13 other end ground connection, described diode A1 is connected in parallel 9 pin and the diode D3 of the chip U1 of refrigeration module 3.
Further, with reference to shown in Fig. 2, 14 pin of described chip U1 are connected in parallel L1, C3, C4, the described L1 other end connects power source voltage Vcc, described C3, C4 ground connection, 13 pin of described chip U1 connect 14 pin, 12 pin connect 14 pin by resistance R2, the 10 pin shunt capacitance C14 of described chip U1 and resistance R9, the described resistance R9 other end connects electric capacity C17, the other end ground connection of described electric capacity C14 and described electric capacity C17, 6 pin of described chip U1 connect ground connection after electric capacity C18, ground connection after 8 pin connecting resistance R20, 1 pin of described chip U1 is connected 5 pin with 2 pin by electric capacity C1, C8 is connected in parallel after the 2 pin connection L2 of described chip U1, C9, L3 and R7, the other end of described C8 with C9 is connected, described R7 is connected in parallel R17 and Q2, described L3 is connected in parallel C6 and C5, described C6 and C5 other end ground connection, 7 pin of described chip U1 are connected in parallel R8, C7 and described C8, by ground connection after R16 after described R8 with the C7 other end is connected.
The operation principle of the present embodiment is as follows:
Nurse one's health in SDD detector output temperature voltage signal to filtering and amplifying circuit, then by conditioning after signal by FB(current feedback signal) interface be connected to LT3601EMSE form DC-DC change-over circuit in, continuous print carries out closed-loop control, the constant d. c. voltage signal of final output, to SDD detector refrigerating chip, achieves constant refrigerating function.
J6 connector is SDD detector output connection port, and Temp is the temperature signal network label that SDD detector provides, and represent with voltage system at this, this voltage signal realizes low-pass filter amplifier by U2A chip;
Then:
；
Follow the change of SDD detector temperature signal, be input to U1 feedback pin 9 pin, U1 carries out the adjustment of dutycycle according to chip internal;
Supply voltage, by LC low pass filter (L1, C3, C4) output signal, is then input to the power pins (Pin13 and Pin14 short circuit place) of chip U1, improves the antijamming capability of this module; The pulse signal that U1 exports, by secondary LC wave filter, is carried out filtering and exports direct current signal by the output of U1.The first order: L2, C8, C9 form low pass filter; The second level L3, C5, C6 form low pass filter.Final output signal refrigeration voltage is freezed in SDD detector, constantly like this carries out closed-loop control, until V
fB=Vmax, then export constant voltage, finally can by refrigeration module constant control.
R7 and R17 carries out the input voltage as Q2 after dividing potential drop, then the emitter stage of control Q2 and the conducting of colelctor electrode and high resistant (disconnection) state, the colelctor electrode of Q2 is connected to U1(Pin12:RUN), the input signal of such RUN is Vcc(logical one) or GND(logical zero), control this chip power the need of startup.
8 pin of U1 connect a resistance to ground, set the internal work frequency of oscillation of this chip; The 6 pin inner 3.3V voltage-stablizer output pin of U1 is by electric capacity C18 ground connection.10 pin of the compensation pin of U1 undertaken connecting by discrete component R9 and C17 and then with C14 earth,
7th pin is overvoltage signal; U1 chip the 5th pin FB is current feedback signal, and the peak signal of feedback signal is Vmax.
Claims (2)
1. a constant refrigeration control circuit of handheld X-ray fluorescence spectrometer, it is characterized in that: comprise sensor I/O interface module (1), the TEMP port of the J6 connector of described sensor I/O interface module (1) connects the positive input terminal of the operational amplifier in filtering and amplifying circuit (2), the positive input terminal of described operational amplifier is connected in parallel resistance R3 and electric capacity C11, the described resistance R3 other end connects voltage, the negative input end of described operational amplifier is connected in parallel resistance R15 and R18, the described R18 other end connects the output of described operational amplifier, the output contact resistance R5 of described operational amplifier, described resistance R5 is connected in series electric capacity C12 and resistance R6, described resistance R6 is connected in series resistance R11, electric capacity C13 and diode A1, described electric capacity C12, resistance R11 and electric capacity C13 other end ground connection, described diode A1 is connected in parallel 9 pin and the diode D3 of the chip U1 of refrigeration module (3).
2. constant refrigeration control circuit of handheld X-ray fluorescence spectrometer according to claim 1, it is characterized in that: 14 pin of described chip U1 are connected in parallel L1, C3, C4, the described L1 other end connects power source voltage Vcc, described C3, C4 ground connection, 13 pin of described chip U1 connect 14 pin, 12 pin connect 14 pin by resistance R2, the 10 pin shunt capacitance C14 of described chip U1 and resistance R9, the described resistance R9 other end connects electric capacity C17, the other end ground connection of described electric capacity C14 and described electric capacity C17, 6 pin of described chip U1 connect ground connection after electric capacity C18, ground connection after 8 pin connecting resistance R20, 1 pin of described chip U1 is connected 5 pin with 2 pin by electric capacity C1, C8 is connected in series after the 2 pin connection L2 of described chip U1, C9, L3 and R7, the other end of described C8 with C9 is connected, described R7 is connected in parallel R17 and Q2, described L3 is connected in series C6 and C5, described C6 and C5 other end ground connection, 7 pin of described chip U1 are connected in parallel R8, C7 and described C8, by ground connection after R16 after described R8 with the C7 other end is connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310394014.1A CN103471301B (en) | 2013-09-03 | 2013-09-03 | A kind of constant refrigeration control circuit of handheld X-ray fluorescence spectrometer |
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| CN201310394014.1A CN103471301B (en) | 2013-09-03 | 2013-09-03 | A kind of constant refrigeration control circuit of handheld X-ray fluorescence spectrometer |
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| CN103471301A CN103471301A (en) | 2013-12-25 |
| CN103471301B true CN103471301B (en) | 2016-03-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105352984A (en) * | 2015-12-14 | 2016-02-24 | 山东航天电子技术研究所 | SDD (Silicon Drift Detector)-based X-ray fluorescence analysis system |
| CN112748353A (en) * | 2020-12-29 | 2021-05-04 | 烟台大学 | XPSI board fault diagnosis method for high-voltage generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2504615Y (en) * | 2001-11-09 | 2002-08-07 | 复旦大学 | Hand-held wavelength spectrometer |
| JP2004340589A (en) * | 2003-05-13 | 2004-12-02 | Fukui Masaya | Fluorescence detecting method and fluorescence detector |
| US7684036B2 (en) * | 2006-11-30 | 2010-03-23 | Bwt Property, Inc. | Method for real time cure status monitoring of dental resin |
| CN201788941U (en) * | 2010-08-04 | 2011-04-06 | 江苏天瑞仪器股份有限公司 | Filament emission current stabilizing control circuit in mass spectrograph |
| CN102545608A (en) * | 2010-12-29 | 2012-07-04 | 中国科学院西安光学精密机械研究所 | Constant current source drive circuit and semiconductor refrigerator control system |
| CN203518377U (en) * | 2013-09-03 | 2014-04-02 | 周健 | Handheld X-ray fluorescence spectrophotometer constant-refrigeration control circuit |
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Effective date of registration: 20160912 Address after: Suzhou City, Jiangsu province 215343 Kunshan City Qiandeng Town No. 188 North Road, room 2 Shipu harvest Patentee after: Kunshan Shuhow Instrument Technology Co.,Ltd. Patentee after: Xu Rongwang Address before: 215000, 76, 1206, ideal home, hi tech Zone, Jiangsu, Suzhou Patentee before: Zhou Jian |