CN108693406A - The high-voltage transmission cable impedance parameter computational methods and system of X-ray generator - Google Patents
The high-voltage transmission cable impedance parameter computational methods and system of X-ray generator Download PDFInfo
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- CN108693406A CN108693406A CN201710235206.6A CN201710235206A CN108693406A CN 108693406 A CN108693406 A CN 108693406A CN 201710235206 A CN201710235206 A CN 201710235206A CN 108693406 A CN108693406 A CN 108693406A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The present invention provides a kind of the high-voltage transmission cable impedance parameter computational methods and system of X-ray generator.According to an embodiment, X-ray generator includes an X-ray bulb and a sampling resistor, and the high-voltage transmission cable impedance parameter computational methods of the X-ray generator include the following steps:1) the cathode heated current of the X-ray bulb is reduced to given threshold;2) high pressure in short-term is carried out to the X-ray bulb to load;3) the tube voltage U of the X-ray bulb is acquiredkvWith the electric current I for flowing through the sampling resistormA;And 4) utilize the tube voltage UkvWith the electric current ImACalculate high-voltage transmission cable impedance parameter.Measurement accuracy can be improved using method and system proposed by the present invention.
Description
Technical field
The present invention relates to the field of medical instrument technology, the high-voltage transmission cable impedance of especially a kind of X-ray generator
Calculation method of parameters and system.
Background technology
High voltage cable is a kind of special cables being widely used in high-voltage transmission, in the working environment of high-frequency and high-voltage,
High voltage cable will present out conduction resistance characteristic, and the parasitic capacitance effect between high-pressure conductor and cable shielding layer also can be right
The transmission of high pressure and electric current impacts.
Currently, the data enumerated in the product manual mainly provided by manufacturer obtain high voltage cable parasitism ginseng
Number, then estimated and compensated by experience, this method has the following defects:When the comparison of coherence difference of cable products,
The error that this method obtains is very big;Also, the parasitic parameter of tube voltage, tube current sample circuit can not be covered practical calculating
In, it is difficult to the transient response of tube voltage and tube current is optimized using obtained data.
Invention content
In view of this, be tube voltage, the tube current waveform for optimize the bulb in X-ray generator,
The present invention provides a kind of scheme obtaining the practical parasitic parameter of high voltage cable.
One aspect of the present invention proposes a kind of high-voltage transmission cable impedance parameter computational methods of X-ray generator, separately
On the one hand a kind of high-voltage transmission cable impedance parameter computing system of X-ray generator is proposed.
According to an embodiment, X-ray generator includes an X-ray bulb and a sampling resistor, and the X-ray occurs
The high-voltage transmission cable impedance parameter computational methods of device include the following steps:1) cathode of the X-ray bulb is heated into electricity
Stream is reduced to given threshold;2) high pressure in short-term is carried out to the X-ray bulb to load;3) the pipe electricity of the X-ray bulb is acquired
Press UkvWith the electric current I for flowing through the sampling resistormA;And 4) utilize the tube voltage UkvWith the electric current ImAHigh pressure is calculated to pass
Defeated cable impedance parameter.
Wherein, the given threshold can be zero.
Wherein, the high pressure load time carried out to the X-ray bulb can be no more than 10ms.
Wherein it is possible to by digitize it is equally spaced in a manner of acquire the tube voltage UkvWith the electric current ImA。
Wherein, the method can also include repeating step 2)-step 4) with different high pressures, and pass through iterative calculation
Obtain the high-voltage transmission cable impedance parameter.
Wherein it is possible to iterate to calculate the high-voltage transmission cable impedance parameter Z by following formular(z):
Wherein, parameter b0-bmAnd a1-anMeet following formula:
Ukv(kT)+a1Ukv[(k-1)T]+a2Ukv[(k-2)T]+…+anUkv[(k-n)T]=b0ImA(kT)+b1ImA[(k-1)
T]+…+bmImA[(k-m)T]。
According to another embodiment, X-ray generator includes an X-ray bulb and a sampling resistor, the X-ray hair
The high-voltage transmission cable impedance parameter computing system of generating apparatus includes:One setting device, is used for the cathode of the X-ray bulb
Heated current is reduced to given threshold;One pressue device is loaded for carrying out high pressure in short-term to the X-ray bulb;One acquisition
Device, the tube voltage U for acquiring the X-ray bulbkvWith the electric current I for flowing through the sampling resistormA;And one calculate dress
It sets, for utilizing the tube voltage UkvWith the electric current ImACalculate high-voltage transmission cable impedance parameter.
Wherein, the given threshold can be zero.
Wherein, the high pressure load time carried out to the X-ray bulb can be no more than 10ms.
Wherein, the harvester can by digitize it is equally spaced in a manner of acquire the tube voltage UkvWith the electric current
ImA。
Wherein, the pressue device can carry out high pressure load in short-term with different high pressures to the X-ray bulb, and
The harvester acquisition is under different high pressures, the different tube voltage U of the X-ray bulbkvWith flow through the sampling resistor
Different electric current ImA, the computing device is for utilizing the different tube voltage UkvWith the different electric current ImA, iterative calculation institute
State high-voltage transmission cable impedance parameter.
Wherein, the computing device can iterate to calculate the high-voltage transmission cable impedance parameter Z by following formular
(z):
Wherein, parameter b0-bmAnd a1-anMeet following formula:
Ukv(kT)+a1Ukv[(k-1)T]+a2Ukv[(k-2)T]+…+anUkv[(k-n)T]=b0ImA(kT)+b1ImA[(k-1)
T]+…+bmImA[(k-m)T]。
The present invention can be by measuring and being calculated the impedance operator of currently used high voltage cable, in known high-voltage line
In the case of the distributed constant of cable, the tube voltage and tube current sampled by sampling resistor can be compensated, to
Improve measurement accuracy.
Description of the drawings
Below will detailed description of the present invention embodiment by referring to accompanying drawing, the person of ordinary skill in the art is more clear that
The above-mentioned and other feature and advantage of the present invention, in attached drawing:
Fig. 1 is to be shown according to the high-voltage rectifying Transmission system equivalent circuit of the X-ray generator of an embodiment of the present invention
It is intended to.
Fig. 2 is another equivalent electricity of high-voltage rectifying Transmission system according to the X-ray generator of an embodiment of the present invention
Road schematic diagram.
Fig. 3 is the high-voltage transmission cable impedance parameter calculating side according to the X-ray generator of an embodiment of the present invention
The schematic flow chart of method.
Fig. 4 is to calculate system according to the high-voltage transmission cable impedance parameter of the X-ray generator of an embodiment of the present invention
The schematic block diagram of system.
Wherein, reference numeral is as follows:
100,200 equivalent circuit
101 X-ray bulbs
Zrs, Zrp equiva lent impedance
Cs filter capacitors
ImA,Irp,ItubeElectric current
Rs sampling resistors
US,UkVVoltage
300 high-voltage transmission cable impedance parameter computational methods
S310-S340 steps
400 high-voltage transmission cable impedance parameter computing systems
410 setting devices
420 pressue devices
430 harvesters
440 computing devices
Specific implementation mode
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control illustrates this hair
Bright specific implementation mode, in the various figures identical label indicate identical part.
Herein, " schematic " expression " serving as example, example or explanation " should not will be described herein as " showing
Any diagram, the embodiment of meaning property " are construed to a kind of preferred or more advantageous technical solution.
To make simplified form, part related to the present invention is only schematically shown in each figure, they are not represented
Its practical structures as product.In addition, so that simplified form is easy to understand, there is identical structure or function in some figures
Component only symbolically depicts one of those, or has only marked one of those.
Herein, " one ", "one" not only indicate " only this ", can also indicate the situation of " more than one ".
Herein, " first ", " second " etc. are only used for mutual differentiation, rather than indicate their significance level and sequence and each other
Existing premise etc..
Principle to illustrate the invention, referring first to Fig. 1.Fig. 1 is to be filled according to the X-ray of an embodiment of the present invention
The high-voltage rectifying Transmission system schematic equivalent circuit set.It should be noted that in the state of the art, usually not
The pipe electricity of X-ray bulb 101 is calculated in the influence for considering high voltage cable by measuring the voltage value on sampling resistor Rs
Flow valuve.However, as previously mentioned, the parasitic capacitance effect between high-pressure conductor and cable shielding layer can be to the transmission of high pressure and electric current
It impacts.Therefore, it is further improving measurement accuracy, present invention proposition can measure and be calculated currently used high pressure
The technical solution of the impedance operator of cable.
Specifically, high voltage cable is as Jie that voltage and current caused by high pressure generator is transferred to X-ray bulb
Matter, parasitic parameter can mainly be divided into series equivalent impedance Zrs and parallel equivalent impedance Z rp.As shown in Figure 1, equivalent
Circuit 100 includes tube current sampling resistor Rs, filter capacitor Cs, the series equivalent impedance Zrs of high voltage cable and parallel equivalent resistance
Anti- Zrp and X-ray bulb 101.Wherein, Us is the voltage on current sampling resistor Rs, ImATo flow through current sampling resistor Rs
On electric current, IrpTo flow into the electric current of high-tension cable parallel equivalent impedance Z rp, ItubeTo flow through the practical electricity of X-ray bulb 101
Stream, UkvFor the true tube voltage of X-ray bulb 101.
When X-ray bulb 101 this electric current all the way is sufficiently small and negligible (such as X-ray bulb 101 this be in all the way
High-impedance state), equivalent circuit 100 as shown in Figure 1 can be equivalent to equivalent circuit 200 as shown in Figure 2.Referring to Fig. 2, figure
2 is according to another schematic equivalent circuits of high-voltage rectifying Transmission system of the X-ray generator of an embodiment of the present invention.Such as
Shown in Fig. 2, in equivalent circuit 200, X-ray bulb is ignored by equivalent.At this point, since high voltage cable is unique effectively negative
It carries, therefore ImA=Irp, UkvTo load the voltage value on high voltage cable.Necessarily satisfying for following formula on continuous frequency domain:
[Zrs(s)+Zrp(s)]*ImA(s)=Zr(s)*ImA(s)=Ukv(s)。
By to ImAAnd UkvTransient waveform carry out discrete sampling and calculating at equal intervals, can in the form of difference equation table
State the impedance operator of high-tension cable.
In conjunction with Fig. 3, to a kind of high-voltage transmission cable impedance parameter computational methods of X-ray generator proposed by the present invention
Carry out associated description.Fig. 3 is the high-voltage transmission cable impedance parameter meter according to the X-ray generator of an embodiment of the present invention
The schematic flow chart of calculation method, in the embodiment shown in fig. 3, the high-voltage transmission cable impedance of X-ray generator
Calculation method of parameters 300 may include steps of:
Step S310:The cathode heated current of X-ray bulb is reduced to given threshold;
Step S320:High pressure in short-term is carried out to the X-ray bulb to load;
Step S330:Acquire the tube voltage U of X-ray bulbkvWith the electric current I for flowing through sampling resistormA;And
Step S340:Utilize tube voltage UkvWith electric current ImACalculate high-voltage transmission cable impedance parameter.
According to the characteristic of X-ray bulb, after the filament heating current of bulb is less than a threshold value, filament would not emit
Thermoelectron, even if loading high pressure on bulb there will not be tube current generation.At this point, X-ray bulb is due to being in high-impedance state, it can
To be ignored by equivalent.To which in practice, the given threshold in step S310 can be zero.That is, the cathode of X-ray bulb is added
Thermocurrent is reduced to zero.
In change mode, pressurizeed in short-term to X-ray bulb in step S320, those skilled in the art can
The duration of high pressure load to be arranged according to actual needs, for example, the high pressure load time carried out to X-ray bulb can not
More than 10ms.In addition, not carrying out closed-loop control to tube current in high pressure loading procedure.
In practice, can by A/D converter part (such as A/D chips) by digitize it is equally spaced in a manner of acquire tube voltage Ukv
With the electric current I for flowing through sampling resistormA。
In other embodiments, the method can also include repeating step S320- step S340 with different high pressures,
And high-voltage transmission cable impedance parameter is obtained by iterative calculation.It is passed for example, high pressure can be iterated to calculate by following formula
Defeated cable impedance parameter Zr(z):
Wherein, parameter b0-bmAnd a1-anMeet following formula:
Ukv(kT)+a1Inkv[(k-1)T]+a2Ukv[(k-2)T]+…+anUkv[(k-n)T]=b0ImA(kT)+b1ImA[(k-
1)T]+…+bmImA[(k-m)T]。
Those skilled in the art should be understood that and correctly use above-mentioned iterative formula, related content to be simultaneously not belonging to this
Where the emphasis of invention, therefore described herein without expansion.For example, those skilled in the art can refer to following document
To assist understanding above-mentioned iterative formula and its application:It is proposed simultaneously by Weiping Wang, Yujie Shi and Dianbing Yang
In 2008 in (DOI on IEEE:Document " A New Modeling 10.1109/PEITS.2008.117) published
A kind of (the new modeling sides for switch power converter Method for the Switching Power Converter
Method) ".
With reference to Fig. 4, to a kind of high-voltage transmission cable impedance parameter calculating of X-ray generator proposed by the present invention
System carries out associated description.Fig. 4 is to be joined according to the high-voltage transmission cable impedance of the X-ray generator of an embodiment of the present invention
The schematic block diagram of number computing systems, in embodiment as shown in Figure 4, X-ray generator includes an X-ray bulb and one
The high-voltage transmission cable impedance parameter computing system 400 of sampling resistor (not shown), X-ray generator includes setting device
410, pressue device 420, harvester 430 and computing device 440.
Wherein, setting device 410 is used to the cathode heated current of X-ray bulb being reduced to given threshold, pressue device
420 load for carrying out high pressure in short-term to X-ray bulb, and harvester 430 is used to acquire the tube voltage U of X-ray bulbkvAnd stream
The electric current I of over-sampling resistancemA, computing device 440 is for utilizing tube voltage UkvWith electric current ImACalculate high-voltage transmission cable impedance ginseng
Number.
In embodiments, given threshold can be zero, you can with by the way that device 410 is arranged by the cathode of X-ray bulb
Heated current is reduced to zero.Pressue device 420 can be no more than 10ms to the high pressure load time that X-ray bulb carries out.In addition,
Closed-loop control is not carried out to tube current in high pressure loading procedure.
In practice, harvester 430 can by digitize it is equally spaced in a manner of acquire tube voltage UkvWith electric current ImA, for example,
A/D converter part (such as A/D chips) can be set in harvester to complete relevant data acquisition.
Pressue device 420 can carry out high pressure in short-term to X-ray bulb with different high pressures and load, and harvester
430 acquisitions are under different high pressures, the different tube voltage U of X-ray bulbkvWith the different electric current I for flowing through sampling resistormA, thus
The sampled value of multigroup voltage and current can be respectively obtained, to which computing device 440 can utilize different tube voltage UkvAnd difference
Electric current ImA, iterate to calculate high-voltage transmission cable impedance parameter.
For example, computing device 440 can iterate to calculate high-voltage transmission cable impedance parameter Z by following formular(z):
Wherein, parameter b0-bmAnd a1-anMeet following formula:
Ukv(kT)+a1Ukv[(k-1)T]+a2Ukv[(k-2)T]+…+anUkv[(k-n)T]=b0ImA(kT)+b1ImA[(k-1)
T]+…+bmImA[(k-m)T]。
The present invention for X-ray generator provide it is a kind of can be by measuring and being calculated currently used high pressure
The scheme of the impedance operator of cable, specifically, the present invention provide a kind of high-voltage transmission cable impedance parameter of X-ray generator
Computational methods and system.According to an embodiment, X-ray generator includes an X-ray bulb and a sampling resistor, the X
The high-voltage transmission cable impedance parameter computational methods of ray generating device include the following steps:1) by the moon of the X-ray bulb
Pole heated current is reduced to given threshold;2) high pressure in short-term is carried out to the X-ray bulb to load;3) the X-ray ball is acquired
The tube voltage U of pipekvWith the electric current I for flowing through the sampling resistormA;And 4) utilize the tube voltage UkvWith the electric current ImAMeter
Calculate high-voltage transmission cable impedance parameter.Thus can be in point of known high voltage cable using method and system proposed by the present invention
In the case of cloth parameter, the tube voltage and tube current sampled by sampling resistor can be compensated, be surveyed to improve
Accuracy of measurement.
Example the above is only the implementation of the present invention is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (12)
1. a kind of high-voltage transmission cable impedance parameter computational methods of X-ray generator, the X-ray generator includes one
X-ray bulb and a sampling resistor, described method includes following steps:
1) the cathode heated current of the X-ray bulb is reduced to given threshold;
2) high pressure in short-term is carried out to the X-ray bulb to load;
3) the tube voltage U of the X-ray bulb is acquiredkvWith the electric current I for flowing through the sampling resistormA;And
4) the tube voltage U is utilizedkvWith the electric current ImACalculate high-voltage transmission cable impedance parameter.
2. the high-voltage transmission cable impedance parameter computational methods of X-ray generator as described in claim 1, wherein described
Given threshold is zero.
3. the high-voltage transmission cable impedance parameter computational methods of X-ray generator as described in claim 1, wherein to institute
The high pressure load time for stating the progress of X-ray bulb is no more than 10ms.
4. the high-voltage transmission cable impedance parameter computational methods of X-ray generator as described in claim 1, wherein with number
The equally spaced mode of wordization acquires the tube voltage UkvWith the electric current ImA。
5. the high-voltage transmission cable impedance parameter computational methods of X-ray generator as described in claim 1, further include with not
Same high pressure repeats step 2)-step 4), and passes through to iterate to calculate and obtain the high-voltage transmission cable impedance parameter.
6. the high-voltage transmission cable impedance parameter computational methods of X-ray generator as claimed in claim 5, wherein pass through
Following formula iterates to calculate the high-voltage transmission cable impedance parameter Zr(z):
Wherein, parameter b0-bmAnd a1-anMeet following formula:
Ukv(kT)+a1Ukv[(k-1)T]+a2Ukv[(k-2)T]+…+anUkv[(k-n)T]=b0ImA(kT)+b1ImA[(k-1)T]
+…+bmImA[(k-m)T]。
7. a kind of high-voltage transmission cable impedance parameter computing system of X-ray generator, the X-ray generator includes one
X-ray bulb and a sampling resistor, the system comprises:
One setting device, for the cathode heated current of the X-ray bulb to be reduced to given threshold;
One pressue device is loaded for carrying out high pressure in short-term to the X-ray bulb;
One harvester, the tube voltage U for acquiring the X-ray bulbkvWith the electric current I for flowing through the sampling resistormA;And
One computing device, for utilizing the tube voltage UkvWith the electric current ImACalculate high-voltage transmission cable impedance parameter.
8. the high-voltage transmission cable impedance parameter computing system of X-ray generator as claimed in claim 7, wherein described
Given threshold is zero.
9. the high-voltage transmission cable impedance parameter computing system of X-ray generator as claimed in claim 7, wherein described
Pressue device is no more than 10ms to the high pressure load time that the X-ray bulb carries out.
10. the high-voltage transmission cable impedance parameter computing system of X-ray generator as claimed in claim 7, wherein described
Harvester by digitize it is equally spaced in a manner of acquire the tube voltage UkvWith the electric current ImA。
11. the high-voltage transmission cable impedance parameter computing system of X-ray generator as claimed in claim 7, wherein described
Pressue device carries out high pressure in short-term to the X-ray bulb with different high pressures and loads, and harvester acquisition is not
Under same high pressure, the different tube voltage U of the X-ray bulbkvWith the different electric current I for flowing through the sampling resistormA, the meter
Device is calculated using the different tube voltage UkvWith the different electric current ImA, iterate to calculate the high-voltage transmission cable impedance parameter.
12. the high-voltage transmission cable impedance parameter computing system of X-ray generator as claimed in claim 11, wherein institute
It states computing device and the high-voltage transmission cable impedance parameter Z is iterated to calculate by following formular(z):
Wherein, parameter b0-bmAnd a1-anMeet following formula:
Ukv(kT)+a1Ukv[(k-1)T]+a2Ukv[(k-2)T]+…+anUkv[(k-n)T]=b0ImA(kT)+b1ImA[(k-1)T]
+…+bmImA[(k-m)T]。
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|---|---|---|---|
| CN201710235206.6A CN108693406B (en) | 2017-04-12 | 2017-04-12 | Method and system for calculating impedance parameters of high-voltage transmission cable of X-ray generating device |
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