CN101965093B - High pressure generator calibration method - Google Patents

High pressure generator calibration method Download PDF

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Publication number
CN101965093B
CN101965093B CN 201010244345 CN201010244345A CN101965093B CN 101965093 B CN101965093 B CN 101965093B CN 201010244345 CN201010244345 CN 201010244345 CN 201010244345 A CN201010244345 A CN 201010244345A CN 101965093 B CN101965093 B CN 101965093B
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CN
China
Prior art keywords
high pressure
pressure generator
resistance
fd
described
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CN 201010244345
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Chinese (zh)
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CN101965093A (en
Inventor
陈小强
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深圳市蓝韵实业有限公司
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Priority to CN 201010244345 priority Critical patent/CN101965093B/en
Publication of CN101965093A publication Critical patent/CN101965093A/en
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Abstract

The invention discloses a high pressure generator calibration method comprising the following steps: A1, measuring the practical resistance value of feedback divider resistor and the practical resistance value of series resistors of the high pressure generator; A2, calculating a feedback error; and A3, according to the feedback error and the amplification reference of the high pressure generator, controlling the exposure process of the high pressure generator at the bulb tube. The high pressure generator calibration method of the invention automatically calibrates the feedback error caused by the series resistors in high tension transformer tank of the high pressure generator with a soft approach, has simple calibration step, simple operation, short calibration time and low error probability, and does not need to use a special instrument.

Description

A kind of high pressure generator calibration method

Technical field

The present invention relates to the radiation filming system technical field, be specifically related to a kind of radiation filming system high pressure generator calibration method.

Background technology

As shown in Figure 1, radiation filming system utilizes 40-150KV and the heater current of high pressure generator output, make bulb produce X ray, after X ray penetrates tissue, difference because of tissue, the attenuation degree of X ray is different, utilizes x-ray imaging system the X ray of decay to be changed into to the image of tissue.

As shown in Figure 2, the high pressure generator operation principle is first power-frequency voltage to be become to the direct voltage of low-ripple coefficient through rectification, filtering, then produce high frequency voltage by inverse transformation, then the boosting of the transformer in the high-tension transformer case, rectification, filtering, export to the X bulb.The stability of high pressure generator and consistency have determined the quality of x-ray imaging.

As shown in Figure 3, the medical diagnosis X radial bulb needs the high pressure of high pressure generator output 40KV to 150KV, and the control desk of high pressure generator and master board are digital signal and the analog signal of low pressure, and the scope of KV set point is between 0 to 10 volt.So proportionate relationship K between KV set point and high pressure generator actual high-voltage output valve set(high pressure generator amplification reference value) is the corresponding 10 several KV of 1V, is defined as K here set=1V: nKV, for example will export 100KV, and the KV set point is so due to production technology, the high-tension transformer case does not have consistency, is mainly manifested in two aspects: 1, the transformer leakage inductance value of different high-tension transformer casees inside has difference.2, the KV of high-tension transformer case inside feedback dividing potential drop series resistance quantity is more, and the error of single resistance is 5%, and accumulated error is larger.Existing calibration steps is all to add the error that the sampling feedback correcting circuit compensates series connection divider resistance in the high-tension transformer case on inversion drives.The KV set point that the master control borad of high pressure generator is set according to control desk, by KV set point and the certain proportionate relationship of KV value, utilize the digital analog converter DAC in master board, the KV set point is converted to corresponding KV reference voltage, deliver in the error amplifier of inversion drive plate.The KV value of feedback need to enter into error amplifier through a potentiometer, and this potentiometer is error for correcting series resistance in the high-tension transformer case.KV set point and KV value of feedback are done computing through error amplifier like this, and operation result is controlled inversion and produced corresponding KV value.The hardware calibration method of prior art, following shortcoming is arranged: calibration process is loaded down with trivial details, the step complexity, the alignment time is long, needs to use special instrument, must be operated by the expert engineer, and error probability is higher.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of high pressure generator calibration method, overcomes the prior art high pressure generator and eliminates the loaded down with trivial details complexity of calibration steps of series resistance error in the high-tension transformer case, easily wrong defect occurs.

The present invention solves the problems of the technologies described above adopted technical scheme to be:

A kind of high pressure generator calibration method comprises step:

A1, the actual resistance of measuring high pressure generator feedback divider resistance and the actual resistance of series resistance;

A2, calculating feedback error;

A3, amplify reference value according to described feedback error and high pressure generator the exposure process of bulb in high pressure generator is controlled;

Wherein said high pressure generator calibration method, wherein said steps A 1 comprises step:

B1, the actual resistance of measuring high pressure generator feedback divider resistance and the actual resistance of series resistance;

B2, store the ratio K of described feedback divider resistance actual resistance and described series resistance actual resistance ' fD;

Wherein, described high pressure generator calibration method, wherein said steps A 2 comprises step:

B3, the theoretical resistance of calculating high pressure generator feedback divider resistance and the theoretical resistance of series resistance;

B4, store the ratio K of the theoretical resistance of described feedback divider resistance and described series resistance theory resistance fD;

B5, calculating K ' fDwith K fDdifference, store the long-pending Δ K that described difference is multiplied by a fixed constant set;

B6, calculating K fDlong-pending K with described fixed constant set.

Described high pressure generator calibration method, wherein by K setwith Δ K setand the PDM keyer that outputs to high pressure generator after digital-to-analogue conversion.

Beneficial effect of the present invention: high pressure generator calibration method of the present invention carries out automatic calibration by software approach to the feedback error that in high pressure generator high-tension transformer case, series resistance causes, calibration steps is simple, easily operation, alignment time is short, and do not need to use special instrument, error probability is low.

The accompanying drawing explanation

The present invention includes following accompanying drawing:

Fig. 1 is prior art radiation filming system schematic diagram;

Fig. 2 is prior art radiation filming system high pressure generator schematic diagram;

Series resistance error calibration circuit schematic diagram in the high-tension transformer case that Fig. 3 is prior art radiation filming system high pressure generator;

Feedback sample resistance schematic diagram in the high-tension transformer case that Fig. 4 is high pressure generator of the present invention;

Series resistance error calibration circuit schematic diagram in the high-tension transformer case that Fig. 5 is radiation filming system high pressure generator of the present invention;

Fig. 6 is PDM keyer schematic diagram of the present invention;

Fig. 7 is filament inverter circuit schematic diagram of the present invention;

Fig. 8 is feedback circuit schematic diagram of the present invention.

Embodiment

Below according to drawings and embodiments the present invention is described in further detail:

As shown in Figure 4, at first measure the actual resistance (R of high pressure generator feedback divider resistance n± Δ R) actual resistance of series resistance other circuit in series connection bleeder circuit and high-tension transformer case are disconnected, and the bleeder circuit that makes to connect forms an independent loop, by the resistance of series resistance in LCR tester difference testing high voltage transformer tank, and records.According to following formula, calculate actual feedback and amplify reference value K ' fD:

K FD ′ = R N ± ΔR Σ i = 1 n ( R i ± ΔR )

Theoretical resistance and the theoretical computing the resistor value of series resistance ratio (theoretical feedback the is amplified reference value) K of the theoretical resistance of store feedback divider resistance and the theoretical resistance of described series resistance according to high pressure generator feedback divider resistance fD.

High pressure generator amplifies reference value K setamplify reference value K with the theory feedback fDmeet following relation:

K set=C×K FD

Wherein C is fixed constant.And due to the series resistance error, exist in the high pressure generator side circuit, so the actual high-voltage generator amplifies reference value K ' setshould by feedback error (K ' fDwith K fDpoor) take into account:

K′ set=C(K FD+ΔK FD)

Feedback error Δ K wherein fD=K ' fD-K fD

If Δ K set=C Δ K fD

So: K ' set=K set+ Δ K set

When high pressure generator assembling or replacing high-tension transformer case, in the service mode of high pressure generator control desk, K ' is set fDparameter and K fDparameter.Open up a memory cell in the memory of master board, be used for storing K ' fDparameter and K fDparameter.The CPU of master control borad calculates Δ K according to following formula set:

ΔK set=CΔK FD=C(K′ FD-K FD)

As shown in Figure 5 and Figure 6, high pressure generator in the exposure process of bulb by K ' setconvert the PDM keyer (PWM that voltage signal sends to the inversion control plate to, Pulse Width Modulation) error amplifier comparator one end, when receiving adjustment signal FIL KEF, PWM controller (chip TL954) will be adjusted the duty ratio of its output, inversion drives and also is adjusted, thereby adjusts the electric current in filament loop, after heater current changes, the electric current of bulb (load current) has also changed, thereby output KV value also changes thereupon.

As shown in Figure 7, the voltage signal (FIL_REF signal) of DAC output compares with feedback signal FIL_I, thus the duty ratio of the output drive signal of 9 pin of adjustment chip TL594,10 pin.This output drive signal is that inversion drives signal, by switch Q1, Q2, Q3 and Q4, arrives and adjusts filament loop, i.e. current circuit in FIL_DR_OUT.

As shown in Figure 8, when in the high-tension transformer case, filament transformer receives the FIL_DR_OUT curent change, because the equivalence of transformer transmission principle, after the FIL_DR_OUT electric current becomes greatly, the electric current of the opposite side of filament transformer also will become greatly, and the tube current of bulb will become large.Bulb is the load of high pressure generator, because high-tension transformer case gross energy is certain, so, when load current changes, also will affect the variation of output KV voltage.After output KV voltage changes, by the KV feedback voltage of resistance sampling, also will be changed, the KV feedback is received an end of PWM controller, and then adjusts the size of PWM controller duty ratio, forms closed-loop adjustment.

Those skilled in the art do not break away from essence of the present invention and spirit, can there is the various deformation scheme to realize the present invention, the foregoing is only the better feasible embodiment of the present invention, not thereby limit to interest field of the present invention, the equivalent structure that all utilizations specification of the present invention and accompanying drawing content are done changes, within all being contained in interest field of the present invention.

Claims (2)

1. a high pressure generator calibration method, is characterized in that, comprises step:
A1, the actual resistance of measuring high pressure generator feedback divider resistance and the actual resistance of series resistance;
A2, calculating feedback error;
A3, according to described feedback error and high pressure generator, amplify reference value to bulb in high pressure generator
Exposure process controlled;
Wherein, described steps A 1 comprises step:
B1, the actual resistance of measuring high pressure generator feedback divider resistance and the actual resistance of series resistance;
B2, store the ratio K of described feedback divider resistance actual resistance and described series resistance actual resistance ' fD;
Wherein, described steps A 2 comprises step:
B3, the theoretical resistance of calculating high pressure generator feedback divider resistance and the theoretical resistance of series resistance;
B4, store the ratio K of the theoretical resistance of described feedback divider resistance and described series resistance theory resistance fD;
B5, calculating K ' fDwith K fDdifference, store the long-pending Δ K that described difference is multiplied by a fixed constant set;
B6, calculating K fDlong-pending K with described fixed constant set.
2. high pressure generator calibration method according to claim 1, is characterized in that: by K setwith Δ K setand the PDM keyer that outputs to high pressure generator after digital-to-analogue conversion.
CN 201010244345 2010-08-03 2010-08-03 High pressure generator calibration method CN101965093B (en)

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103249238A (en) * 2012-02-10 2013-08-14 南京普爱射线影像设备有限公司 Integrated grid-controlled cold cathode x-ray generating device used for X-ray unit

Citations (2)

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Publication number Priority date Publication date Assignee Title
US4679218A (en) * 1984-06-29 1987-07-07 Siemens Aktiengesellschaft X-ray diagnostic installation having a control system for the x-ray tube high voltage
JP3410164B2 (en) * 1993-07-13 2003-05-26 株式会社日立メディコ Inverter type X-ray high voltage device

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Publication number Priority date Publication date Assignee Title
JPS62207174A (en) * 1986-03-05 1987-09-11 Mitsubishi Electric Corp High frequency generator
JPH09190898A (en) * 1995-12-31 1997-07-22 Shimadzu Corp X-ray high voltage device
JP2007295761A (en) * 2006-04-27 2007-11-08 Matsushita Electric Ind Co Ltd Switching power supply

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4679218A (en) * 1984-06-29 1987-07-07 Siemens Aktiengesellschaft X-ray diagnostic installation having a control system for the x-ray tube high voltage
JP3410164B2 (en) * 1993-07-13 2003-05-26 株式会社日立メディコ Inverter type X-ray high voltage device

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
JP昭62-207174A 1987.09.11
JP特开平9-190898A 1997.07.22
JP特许3410164B2 2003.05.26

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