CN103281854A - X-ray machine filament power supply adopting high-side current detecting technology - Google Patents
X-ray machine filament power supply adopting high-side current detecting technology Download PDFInfo
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- CN103281854A CN103281854A CN2012104765450A CN201210476545A CN103281854A CN 103281854 A CN103281854 A CN 103281854A CN 2012104765450 A CN2012104765450 A CN 2012104765450A CN 201210476545 A CN201210476545 A CN 201210476545A CN 103281854 A CN103281854 A CN 103281854A
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Abstract
The invention discloses an X-ray machine filament power supply adopting a high-side current detecting technology. The X-ray machine filament power supply comprises a current sampling circuit, a high-side current detecting circuit, an inverting control circuit, an inverter main circuit and an output transformer which are sequentially and electrically connected with one another; the X-ray machine filament power supply further comprises a direct current voltage-stabilized power supply and an external control signal interface which is electrically connected with the inverting control circuit; and the current sampling circuit, the high-side current sensing circuit, the inverting control circuit and the inverter main circuit are respectively and electrically connected with the direct current voltage-stabilized power supply. The X-ray machine filament power supply adopts the high-side current detecting technology to realize an input current closed loop and can better control the tube current of an X-ray machine.
Description
Technical field
The present invention relates to a kind of power supply, relate in particular to a kind of X-ray production apparatus filament supply.
Background technology
Filament supply is the important component part of X-ray production apparatus, and being used in X-ray production apparatus provides electric energy to the filament in the X-ray tube, evaporates electronics thereby make filament obtain energy.The tube current stability of X-ray production apparatus is closely related with the performance of filament supply.And X-ray production apparatus in use also needs by regulating filament supply to the energy of filament output the size of tube current to be regulated, and this controls the energy of output with regard to needing filament supply.
Because the filament in the X-ray tube is in high potential state usually, so can not directly be connected to the common power adapter, more can not power to it with direct current, thereby generally use alternating current source by filament transformer to its power supply isolated high-voltage.
Tradition power frequency X-ray production apparatus is employing power frequency automatic coupling voltage regulator or series connection high power varying resistance etc. mode, powers to filament with open loop approach, and not only the filament transformer volume is big for this mode, and regulates inconvenience, and control filament energy accuracy of measurement is low.
Filament supply generally adopts inverting raising frequency to reduce the filament transformer volume in the high frequency X-ray production apparatus.Following three kinds of schemes are being arranged: the open loop policy that, directly changes pulse duration aspect the control of filament energy; Two, the elementary alternating current close-loop control scheme of filament transformer; Three, before inversion, increase the scheme of one-level constant-current source.As can be seen: scheme one obvious precision is low; Scheme two can be subjected to the influence of reactive power and form-factor, and is also inaccurate; Scheme three needs 2 stage converter, complex structure, and also the power output of constant-current source can change output energy instability along with load resistance.
Summary of the invention
Technical problem to be solved by this invention is at above-mentioned the deficiencies in the prior art, and a kind of X-ray production apparatus filament supply that adopts the flash current detection technology is provided.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is a kind of X-ray production apparatus filament supply that adopts the flash current detection technology, it is characterized in that: comprise the current sampling circuit, flash current detection circuit, inverter control circuit, converter main circuit and the output transformer that are electrically connected successively; The external control signal interface that also comprises D.C. regulated power supply and be electrically connected with inverter control circuit; Current sampling circuit, flash current detection circuit, inverter control circuit and converter main circuit are electrically connected with D.C. regulated power supply respectively; Current sampling circuit becomes input current of inverter into voltage signal, voltage signal amplifies and is transformed into and inverter control circuit voltage signal altogether by the flash current detection circuit, inverter control circuit at first will be done error and amplify with inverter control circuit voltage signal and the current settings signal that transmits of external control interface altogether, subsequently with the pulse signal of the output voltage change pulse width of error amplifier, amplified and level conversion by the driving circuit section pulse signals power in the inverter control circuit again, drive the power tube in the converter main circuit, give the power supply of X-ray tube filament by output transformer again.
As further improved technical scheme of the present invention, describedly be in series with little resistance resistance as current sampling circuit at the D.C. regulated power supply flash.
Compared with prior art, the present invention adopts the flash current detection technology to realize the input current closed loop, and the power supply input is constant voltage dc source, makes this circuit simple in structure realize the closed-loop control to input power.Abut against before the converter main circuit because of the current sampling point again, and the power that converter main circuit itself consumes is little of ignoring, so this circuit has been realized being transported to the control of the power on the filament.According to the X-ray tube principle, the temperature of filament is directly being controlled tube current under the certain situation of tube voltage, and temperature is controlled by heater certainly, refers to the X-ray tube filament here, so the power that is delivered directly on the filament is controlled, can better be controlled the tube current of X-ray production apparatus.
Description of drawings
Fig. 1 is modular structure schematic diagram of the present invention.
Fig. 2 is circuit theory schematic diagram of the present invention.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described further.
Embodiment
Referring to Fig. 1 and Fig. 2, the X-ray production apparatus filament supply of this employing flash current detection technology comprises the current sampling circuit, flash current detection circuit, inverter control circuit, converter main circuit and the output transformer that are electrically connected successively; The external control signal interface that also comprises D.C. regulated power supply and be electrically connected with inverter control circuit; Current sampling circuit, flash current detection circuit, inverter control circuit and converter main circuit are electrically connected with D.C. regulated power supply respectively; Current sampling circuit becomes input current of inverter into voltage signal, voltage signal amplifies and is transformed into and inverter control circuit voltage signal altogether by the flash current detection circuit, inverter control circuit at first will be done error and amplify with inverter control circuit voltage signal and the current settings signal that transmits of external control interface altogether, subsequently with the pulse signal of the output voltage change pulse width of error amplifier, amplified and level conversion by the driving circuit section pulse signals power in the inverter control circuit again, drive the power tube in the converter main circuit, give the power supply of X-ray tube filament by output transformer again.Be in series with little resistance resistance as current sampling circuit at the D.C. regulated power supply flash.
Use the D.C. regulated power supply power supply in the present embodiment, current sampling circuit is at the power supply flash, be that power rail is connected little resistance resistance as current sampling resistor, input current of inverter is become voltage signal, by the flash current detection circuit this this signal is amplified and is transformed into and inverter control circuit voltage signal altogether again.The current settings signal that inverter control circuit at first transmits this signal and external control interface is done error with the proportional integral device and is amplified, export the pulse signal with the output voltage change pulse width of error amplifier afterwards, thereby can drive power tube in the converter main circuit by the driving circuit section pulse signals power amplification in the inverter control circuit and level conversion again.Make filament supply realize the closed-loop control of main power circuit input current like this.Because the output voltage of flash current detection circuit and inverter control circuit are altogether, so importing with external control signal such as filament normal signal output, the current settings signal that uses simple external control signal interface circuit can realize controlling size of current is connected.
Use the D.C. regulated power supply power supply in the present embodiment, at the power supply flash little resistance resistance of connecting, input current of inverter is become voltage signal, by the flash current detection circuit this signal is amplified and is transformed into and inverter control circuit voltage signal altogether again, thereby allow filament supply realize the closed-loop control of main power circuit input current, and owing to making connection control signal simple altogether.Because adopt the flash current detection technology to realize the input current closed loop, and the power supply input is the direct current of voltage regulation potential source, the power of last consumption this make this circuit simple in structure realize the closed-loop control to input power.Abut against before the converter main circuit because of the current sampling point again, and the power that converter main circuit itself consumes is little of ignoring, so present embodiment has been realized being transported to the control of the power on the filament.According to the X-ray tube principle, the temperature of filament is directly being controlled tube current under the certain situation of tube voltage, and temperature is directly to be subjected to heater certainly, control, here refer to the X-ray tube filament, so the power that is delivered directly on the filament is controlled, can better control the tube current of X-ray production apparatus.
Claims (2)
1. an X-ray production apparatus filament supply that adopts the flash current detection technology is characterized in that: comprise the current sampling circuit, flash current detection circuit, inverter control circuit, converter main circuit and the output transformer that are electrically connected successively; The external control signal interface that also comprises D.C. regulated power supply and be electrically connected with inverter control circuit; Current sampling circuit, flash current detection circuit, inverter control circuit and converter main circuit are electrically connected with D.C. regulated power supply respectively; Current sampling circuit becomes input current of inverter into voltage signal, voltage signal amplifies and is transformed into and inverter control circuit voltage signal altogether by the flash current detection circuit, inverter control circuit at first will be done error and amplify with inverter control circuit voltage signal and the current settings signal that transmits of external control interface altogether, subsequently with the pulse signal of the output voltage change pulse width of error amplifier, amplified and level conversion by the driving circuit section pulse signals power in the inverter control circuit again, drive the power tube in the converter main circuit, give the power supply of X-ray tube filament by output transformer again.
2. the X-ray production apparatus filament supply of employing flash current detection technology according to claim 1 is characterized in that: describedly be in series with little resistance resistance as current sampling circuit at the D.C. regulated power supply flash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210476545.0A CN103281854B (en) | 2012-11-22 | 2012-11-22 | Adopt the X-ray production apparatus filament supply of high side current detection technique |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210476545.0A CN103281854B (en) | 2012-11-22 | 2012-11-22 | Adopt the X-ray production apparatus filament supply of high side current detection technique |
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| Publication Number | Publication Date |
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| CN103281854A true CN103281854A (en) | 2013-09-04 |
| CN103281854B CN103281854B (en) | 2016-04-13 |
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| CN201210476545.0A Expired - Fee Related CN103281854B (en) | 2012-11-22 | 2012-11-22 | Adopt the X-ray production apparatus filament supply of high side current detection technique |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104378897A (en) * | 2014-11-18 | 2015-02-25 | 汕头市超声仪器研究所有限公司 | X-ray generating device with tube current control function |
| CN105939564A (en) * | 2016-07-13 | 2016-09-14 | 东文高压电源（天津）股份有限公司 | Integrated small-sized negative output X-ray tube high-voltage power source |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104378897A (en) * | 2014-11-18 | 2015-02-25 | 汕头市超声仪器研究所有限公司 | X-ray generating device with tube current control function |
| CN105939564A (en) * | 2016-07-13 | 2016-09-14 | 东文高压电源（天津）股份有限公司 | Integrated small-sized negative output X-ray tube high-voltage power source |
| CN105939564B (en) * | 2016-07-13 | 2017-08-25 | 东文高压电源（天津）股份有限公司 | A kind of integrated small negative output X-ray tube high voltage power supply |
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| CN103281854B (en) | 2016-04-13 |
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Address after: 211300 No. 45 Xiu Shan Road, Gaochun Economic Development Zone, Nanjing, Jiangsu Applicant after: NANJING HEXRAY MEDICAL TECHNOLOGY Co.,Ltd. Address before: 211300 Wuyi street, room 82-203, Dongshan street, Jiangning District, Jiangsu, Nanjing Applicant before: NANJING HEXRAY MEDICAL TECHNOLOGY Co.,Ltd. |
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Granted publication date: 20160413 Termination date: 20211122 |