CN203015261U - X ray machine filament power supply using high side current detection technology - Google Patents
X ray machine filament power supply using high side current detection technology Download PDFInfo
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- CN203015261U CN203015261U CN 201220621254 CN201220621254U CN203015261U CN 203015261 U CN203015261 U CN 203015261U CN 201220621254 CN201220621254 CN 201220621254 CN 201220621254 U CN201220621254 U CN 201220621254U CN 203015261 U CN203015261 U CN 203015261U
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- current detection
- power supply
- inverter control
- control circuit
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Abstract
The utility model discloses an X ray machine filament power supply using a high side current detection technology. The X ray machine filament power supply using the high side current detection technology comprises a current sampling circuit, a high side current detection circuit, an inverter control circuit, an inverter main circuit and an output transformer, wherein the current sampling circuit, the high side current detection circuit, the inverter control circuit, the inverter main circuit and the output transformer are electrically connected in turn. The X ray machine filament power supply using the high side current detection technology further comprises a direct current voltage stabilization power supply and an external control signal interface which is electrically connected with the inverter control circuit. The current sampling circuit, the high side current detection circuit, the inverter control circuit and the inverter main circuit are respectively electrically connected with the direct current voltage stabilization power supply. According to the utility model, the high side current detection technology is used to realize input current closed-loop, and tube current of an X ray machine can be well controlled.
Description
Technical field
The utility model relates to a kind of power supply, relates 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 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 just needs filament supply that the energy of output is controlled.
Because the filament in 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 large for this mode, and regulates inconvenience, controls filament energy accuracy of measurement low.
Filament supply generally adopts inverting raising frequency to reduce the filament transformer volume in high-frequency X-ray.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, increased the scheme of one-level constant-current source before inversion.Can find out: the obvious precision of scheme one is low; Scheme two can be subject to the impact 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 along with load resistance, and the output energy is unstable.
The utility model content
Technical problem to be solved in the utility model is for 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 scheme that the utility model adopts 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 to successively, the external control signal interface that also comprises D.C. regulated power supply and be electrically connected to inverter control circuit, current sampling circuit, flash current detection circuit, inverter control circuit and converter main circuit are electrically connected to 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, at first inverter control circuit 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 inverter control circuit again, drive the power tube in converter main circuit, power to the X-ray tube filament by output transformer again.
As the further improved technical scheme of the utility model, 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 utility model 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 closed-loop control to input power.Before abutting against 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 filament.According to the X-ray tube principle, in the situation that the temperature of the certain filament of tube voltage is directly being controlled tube current, and temperature is controlled by heater certainly, refers to the X-ray tube filament here, so the power that is delivered directly on 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 utility model.
Fig. 2 is circuit theory schematic diagram of the present utility model.
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.
Embodiment
Embodiment 1
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 to successively, the external control signal interface that also comprises D.C. regulated power supply and be electrically connected to inverter control circuit, current sampling circuit, flash current detection circuit, inverter control circuit and converter main circuit are electrically connected to 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, at first inverter control circuit 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 inverter control circuit again, drive the power tube in converter main circuit, power to the 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 the little resistance resistance of power rail series connection is as current sampling resistor, input current of inverter is become voltage signal, then by the flash current detection circuit, this this signal is amplified and is transformed into and inverter control circuit voltage signal altogether.The current settings signal that at first inverter control circuit transmits this signal and external control interface is done error with the proportional integral device and is amplified, export afterwards the pulse signal with the output voltage change pulse width of error amplifier, thereby then can drive power tube in converter main circuit by the driving circuit section pulse signals power amplification in inverter control circuit and level conversion.Make like this filament supply realize the closed-loop control of main power circuit input current.Due to the output voltage of flash current detection circuit and inverter control circuit altogether, output is connected the external control signal connection with the filament normal signal so use simple external control signal interface circuit can realize controlling the current settings signal input of size of current.
Use the D.C. regulated power supply power supply in the present embodiment, at the little resistance resistance of power supply flash series connection, 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 because common ground makes connection control signal simple.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 upper consumption this make this circuit simple in structure realize closed-loop control to input power.Before abutting against converter main circuit because of the current sampling point again, and the power that converter main circuit itself consumes is little of ignoring, so the present embodiment has been realized being transported to the control of the power on filament.According to the X-ray tube principle, in the situation that the temperature of the certain filament of tube voltage is directly being controlled tube current, 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 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 to successively, the external control signal interface that also comprises D.C. regulated power supply and be electrically connected to inverter control circuit, current sampling circuit, flash current detection circuit, inverter control circuit and converter main circuit are electrically connected to 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, at first inverter control circuit 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 inverter control circuit again, drive the power tube in converter main circuit, power to the 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 |
|---|---|---|---|
| CN 201220621254 CN203015261U (en) | 2012-11-22 | 2012-11-22 | X ray machine filament power supply using high side current detection technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220621254 CN203015261U (en) | 2012-11-22 | 2012-11-22 | X ray machine filament power supply using high side current detection technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203015261U true CN203015261U (en) | 2013-06-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220621254 Withdrawn - After Issue CN203015261U (en) | 2012-11-22 | 2012-11-22 | X ray machine filament power supply using high side current detection technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203015261U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103281854A (en) * | 2012-11-22 | 2013-09-04 | 南京恒瑞医疗科技有限公司 | X-ray machine filament power supply adopting high-side current detecting technology |
-
2012
- 2012-11-22 CN CN 201220621254 patent/CN203015261U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103281854A (en) * | 2012-11-22 | 2013-09-04 | 南京恒瑞医疗科技有限公司 | X-ray machine filament power supply adopting high-side current detecting technology |
| CN103281854B (en) * | 2012-11-22 | 2016-04-13 | 南京恒瑞医疗科技有限公司 | Adopt the X-ray production apparatus filament supply of high side current detection technique |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130619 Effective date of abandoning: 20160413 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |