CN106783483B - High pressure generator, X-ray generator and its control method - Google Patents
High pressure generator, X-ray generator and its control method Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
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- H01J35/025—X-ray tubes with structurally associated circuit elements
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Abstract
本发明提供一种高压发生器，包括逆变器，逆变器包括第一桥臂、第二桥臂以及位于第一桥臂和第二桥臂之间的第三桥臂，第一桥臂、第二桥臂分别包括两个开关器件，且第一桥臂可与第三桥臂组成阳极逆变桥，第二桥臂可与第三桥臂组成阴极逆变桥，阳极逆变桥调节高压发生器的阳极电压，阴极逆变桥调节高压发生器的阴极电压；第一控制组件，用于控制阳极逆变桥的开关器件，且第一控制组件的输入端连接高压发生器的阳极，输出端连接所述第一桥臂；第二控制组件，用于控制阴极逆变桥的开关器件，且第二控制组件的输入端连接高压发生器的阴极，输出端连接所述第二桥臂。本发明的高压发生器阴、阳极分别单独控制，提高对不平衡负载的适应能力。此外，本发明还提供一种X射线产生装置及其控制方法。
The present invention provides a high-voltage generator, including an inverter. The inverter includes a first bridge arm, a second bridge arm, and a third bridge arm located between the first bridge arm and the second bridge arm. The first bridge arm The second bridge arm includes two switching devices respectively, and the first bridge arm and the third bridge arm can form an anode inverter bridge, the second bridge arm can form a cathode inverter bridge with the third bridge arm, and the anode inverter bridge can be adjusted The anode voltage of the high-voltage generator, the cathode inverter bridge adjusts the cathode voltage of the high-voltage generator; the first control component is used to control the switching device of the anode inverter bridge, and the input end of the first control component is connected to the anode of the high-voltage generator, The output end is connected to the first bridge arm; the second control component is used to control the switching device of the cathode inverter bridge, and the input end of the second control component is connected to the cathode of the high voltage generator, and the output end is connected to the second bridge arm . The cathode and anode of the high-voltage generator of the present invention are separately controlled to improve the adaptability to unbalanced loads. In addition, the present invention also provides an X-ray generating device and a control method thereof.
Description
Technical field
The invention mainly relates to X-ray control technology, the more particularly, to high pressure generator of X-ray generator, X is penetrated
The control method of beam generating apparatus and X-ray generator.
Background technique
X-ray generator such as X-ray tube is usually used in roentgenotherapia equipment, x-ray diagnostic equipment, X ray computer body
In the medical apparatus and instruments such as layer photographic equipment (CT), Positron Emission Computed Tomography (PET-CT).Using X-ray tube
During emitting X-ray, cathode filament is usually suspended in -70kV~-75kV current potential, anode disc be suspended in+70kV~+
75kV current potential, while by frame ground, it can reduce the insulating requirements of X-ray tube, reduce the volume and cost of X-ray tube.So
And when the X-ray tube work of this cathode and anode electric potential floating, since filament is by thermal electron, in anode and cathode strong electrical field
Accelerating bombardment anode disc under the attraction of (140kV~150kV), electronics slows down suddenly and most of electronics is absorbed by target disc,
Anode disc gives off X-ray simultaneously, and small part electronics then scatters to tube wall from anode disc, flows back to yin eventually by ground wire
Pole.The cathode and anode electric current of the X-ray tube of cathode and anode electric potential floating is caused necessarily to occur as a result, inconsistent, cathode current is even
It can be bigger than anode current by 15%~20%.
In the prior art, X-ray tube high pressure generator only controls the total voltage of cathode and anode, especially by setting such as Fig. 1 institute
The polar-symmetric circuit structure of the yin-yang shown guarantees the balance of yin-yang pole tension.The X-ray tube high pressure generator includes inversion electricity
Road 11, resonant cavity 12, transformer, anode tap voltage doubling rectifing circuit 13, cathode terminal voltage doubling rectifing circuit 14 and connection times simultaneously
The control assembly (not shown) of voltage rectifier and inverter circuit, anode tap voltage doubling rectifing circuit 13 control X-ray tube
Anode voltage, cathode terminal voltage doubling rectifing circuit 14 control the cathode voltage of X-ray tube.In inverter circuit 11, switching device Q1,
Q2 forms leading-bridge, and switching device Q3, Q4 form lagging leg, and each switching device is parallel with backward dioded D1- respectively
D4；Leading-bridge can by the on-off of control switch device Q1, Q2 control high pressure generator anode voltage (feed circuit does not show
Out), and anode voltage is applied to the anode tap of X-ray tube (bulb)；Lagging leg can pass through the logical of control switch device Q3, Q4
The cathode voltage (feed circuit is not shown) of disconnected control high pressure generator, and cathode voltage is applied to the yin of X-ray tube (bulb)
Extremely.As the preferable and cathode current i in cathode and anode circuit symmetrycathWith anode current iandThe lesser situation of degree of unbalancedness
Under, it can realize the balance of cathode and anode voltage substantially using above-mentioned symmetrical structure.However, working as cathode current icathWith anode current
iandWhen degree of unbalancedness becomes larger, above-mentioned control mode then cannot be guaranteed the balance of cathode and anode voltage, thus to cathode and anode circuit and
The requirement with higher of the consistency of high pressure generator；Especially when cathode and anode is using integrated high pressure generator, high pressure generator
Cathode current icathWith anode current iandImbalance will be more significant, and when cathode and anode voltage unbalance factor exceeds X-ray tube
Tolerance range when, X-ray tube can be damaged.Therefore, the mode of this control anode and cathode total voltage adapts to unbalanced load
Ability is poor.
In consideration of it, it is necessary to the cathode and anode balance of voltage structures to existing X-ray tube high pressure generator to improve.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high pressures of X-ray with cathode and anode balance of voltage ability
Raw device overcomes existing cathode and anode balanced structure poor to the coherence request height of high pressure generator, the ability of adaptation unbalanced load
The problem of.
In order to solve the above technical problems, some embodiments of the present invention provide a kind of high pressure generator, comprising:
Inverter, the inverter is including the first bridge arm, the second bridge arm and is located at first bridge arm and the second bridge arm
Between third bridge arm, first bridge arm, the second bridge arm respectively include two switching devices, and first bridge arm can be with
Three bridge arms form anode inverter bridge, and second bridge arm can form cathode inverter bridge, the anode inversion with the third bridge arm
Bridge adjusts the anode voltage of the high pressure generator, and the cathode inverter bridge adjusts the cathode voltage of the high pressure generator；
First control assembly, for controlling the switching device of the anode inverter bridge, and first control assembly is defeated
Enter the anode that end connects the high pressure generator, the output end of first control assembly connects first bridge arm；
Second control assembly, for controlling the switching device of cathode inverter bridge, and the input terminal of second control assembly
The cathode of the high pressure generator is connected, the output end of second control assembly connects second bridge arm.
Optionally, first control assembly includes voltage regulator and modulator, and the voltage regulator is for obtaining
Difference between the anode collection voltages feedback signal and instruction value of the high pressure generator, and tune is generated according to the difference
Voltage processed；The modulator is connect with the voltage regulator, for receiving the modulation voltage, and according to the modulation electricity
Pressure generates first group of driving signal, and first group of driving signal is used to drive the switch device conductive of first bridge arm or cuts
Only；
Second control assembly includes voltage regulator and modulator, and the voltage regulator is for obtaining from the height
The difference between the cathode collection voltages feedback signal and instruction value of generator is pressed, and modulation voltage is generated according to the difference；
The modulator is connect with the voltage regulator, generates for receiving the modulation voltage, and according to the modulation voltage
Two groups of driving signals, second group of driving signal are used to drive switch device conductive or the cut-off of second bridge arm.
Optionally, the third bridge arm includes two concatenated switching devices.
Optionally, the third bridge arm includes concatenated first capacitor and the second capacitor.
Optionally, the modulator includes PWM modulator or PFM modulator, to adopt to first bridge arm, the second bridge arm
The on-off of the switching device is controlled with PWM modulation mode；
Alternatively, controlling first bridge arm, the second bridge arm the on-off of the switching device using PFM modulation system.
Optionally, first control assembly includes PFM modulator, and second control assembly includes PWM modulator, institute
It states PFM modulator while connecting first bridge arm and third bridge arm, the PWM modulator connects second bridge arm, and institute
State rate of connections synchronous circuit between PWM modulator and PFM modulator.
A kind of X-ray generator is proposed according to another aspect of the present invention, comprising: high pressure generator and X-ray tube,
The X-ray tube has cathode and anode, and the high pressure generator includes:
Inverter, the inverter is including the first bridge arm, the second bridge arm and is located at first bridge arm and the second bridge arm
Between third bridge arm, first bridge arm, the second bridge arm respectively include two switching devices, and first bridge arm and third
Bridge arm forms anode inverter bridge, and second bridge arm and the third bridge arm form cathode inverter bridge, the anode inverter bridge tune
The anode voltage of the high pressure generator is saved, the cathode voltage control inverter bridge adjusts the cathode electricity of the high pressure generator
Pressure, and the anode voltage of the high pressure generator is applied to the anode of the X-ray tube, the cathode voltage of the high pressure generator
It is applied to the cathode of the X-ray tube；
First control assembly, can be with the anode inverter bridge composition control circuit, and the input of first control assembly
End connects the anode of the high pressure generator, and the output end of first control assembly connects first bridge arm；
Second control assembly, can be with the cathode inverter bridge composition control circuit, and the input of second control assembly
End connects the cathode of the high pressure generator, and the output end of second control assembly connects second bridge arm.
According to another aspect of the invention, propose that a kind of control method of X-ray generator, the X-ray generate dress
It sets including high pressure generator and X-ray tube, the X-ray tube has cathode and anode, and the high pressure generator includes:
Inverter, the inverter is including the first bridge arm, the second bridge arm and is located at first bridge arm and the second bridge arm
Between third bridge arm, first bridge arm, the second bridge arm respectively include two switching devices, and first bridge arm and third
Bridge arm forms anode inverter bridge, and second bridge arm and the third bridge arm form cathode inverter bridge, the anode inverter bridge tune
The anode voltage of the high pressure generator is saved, the cathode inverter bridge adjusts the cathode voltage of the high pressure generator；
The control method includes:
First voltage feedback signal is acquired from the anode of the high pressure generator, and according to the first voltage feedback signal
First group of driving signal is generated, first group of driving signal controls the anode inverter bridge, so that the high pressure generator
Anode generates first voltage；And
Second voltage feedback signal is acquired from the cathode of the high pressure generator, and according to the second voltage feedback signal
Second group of driving signal is generated, second group of driving signal controls the cathode inverter bridge, so that the high pressure generator
Cathode generates second voltage, and the second voltage has the phase shift of 180 degree relative to the first voltage；
The first voltage is applied to the anode of the X-ray tube, the second voltage is applied to the X-ray tube
Cathode.
Optionally, further includes:
The first current feedback signal is acquired from the anode inverter bridge, according to first current feedback signal and the first electricity
Feedback signal is pressed to control the anode inverter bridge；
The second current feedback signal is acquired from the cathode inverter bridge, according to second current feedback signal and the second electricity
Feedback signal is pressed to control the cathode inverter bridge.
Optionally, the third bridge arm includes two switching devices, and first group of driving signal uses PFM regulative mode
Control simultaneously first bridge arm, in third bridge arm switching device on-off, second group of driving signal use the adjusting side PWN
Formula controls the on-off of switching device in second bridge arm, and the adjusting frequency of first bridge arm, the second bridge arm and third bridge arm
Rate is identical.
Compared with prior art, the invention has the benefit that inverter includes the first bridge arm being set side by side, the second bridge
Arm and third bridge arm, the first bridge arm and third bridge arm form anode inverter bridge, and the second bridge arm and third bridge arm composition cathode are inverse
Becoming bridge, anode inverter bridge adjusts the anode voltage of high pressure generator, and cathode inverter bridge adjusts the cathode voltage of high pressure generator,
When high pressure generator cathode and anode current imbalance, the balance of cathode and anode voltage can be still realized；High pressure generator cathode and anode difference
The case where individually controlling, being applicable to the transformer of high-tension transformer integrally or separately reduces high pressure generator to cathode and anode electricity
The requirement of road consistency improves high pressure generator to the adaptability of unbalanced load；Control loop can be used PWM or PFM with
And the mode of the two any combination, improve the flexibility and diversity of high pressure generator control.
Detailed description of the invention
Fig. 1 is the electrical block diagram of X-ray high-voltage generator in the prior art；
Fig. 2 is the electrical block diagram of the X-ray high-voltage generator of the embodiment of the present invention one；
Fig. 3 is the electrical block diagram of the X-ray high-voltage generator of the embodiment of the present invention two；
Fig. 4 a is a kind of possible modulation waveform figure of the inverter of the embodiment of the present invention two；
Fig. 4 b is the alternatively possible modulation waveform figure of the inverter of the embodiment of the present invention two；
Fig. 5 is the electrical block diagram of the X-ray high-voltage generator of the embodiment of the present invention three；
Fig. 6 is the electrical block diagram of the X-ray high-voltage generator of the embodiment of the present invention four；
Fig. 7 is the electrical block diagram of the X-ray high-voltage generator of the embodiment of the present invention five；
Fig. 8 a is a kind of possible modulation waveform of the inverter of the embodiment of the present invention five；
Fig. 8 b is the alternatively possible modulation waveform figure of the inverter of the embodiment of the present invention five.
Specific embodiment
For the above objects, features and advantages of the present invention can be clearer and more comprehensible, below in conjunction with attached drawing to tool of the invention
Body embodiment elaborates.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, but the present invention can be with
It is different from other way described herein using other and implements, therefore the present invention is by the limit of following public specific embodiment
System.
The embodiment of the present invention describes high pressure generator, the high pressure generator can apply such as roentgenotherapia equipment,
X-ray diagnostic equipment, X ray computer body computer tomography device (CT), Positron Emission Computed Tomography (PET-CT)
Etc. in equipment, but be not limited thereto.
In some embodiments, the X-ray tube high pressure generator with cathode and anode balance of voltage ability includes inversion electricity
Road, the power transformation road include at least three bridge arms, guarantee still realize in the case where the cathode and anode current imbalance of X-ray tube
The balance of cathode and anode voltage.
Embodiment one
Fig. 2 is the electrical block diagram of the X-ray high-voltage generator of one embodiment of the invention.The high pressure generator includes
Inverter (circuit), resonant cavity, transformer, voltage doubling rectifing circuit and control assembly.
Inverter circuit is by first switch device Q1, second switch device Q2, third switching device Q3, the 4th switching device
Q4, first capacitor C1, the second capacitor C2 composition.Wherein, first switch device Q1 and second switch device Q2 are composed in series first
Bridge arm (leading-bridge) 21；Third switching device Q3 and the 4th switching device Q4 are composed in series the second bridge arm (lagging leg) 22；
First capacitor C1 and the second capacitor C2 is composed in series third bridge arm (public bridge arm), third bridge arm setting the first bridge arm 21 with
Between second bridge arm 22, i.e., inverter by the first bridge arm, the second bridge arm and between the first bridge arm and the second bridge arm
Three bridge arms composition.First switch device can be transistor switching circuit, field effect transistor switch circuit to the 4th switching device Q1-Q4
(metal-oxide-semiconductor switching circuit), junction type or insulated gate bipolar transistor (Insulated Gate Bipolar Transistor,
IGBT) etc..
First bridge arm 21, the second bridge arm 22 are connected in parallel with third bridge arm, and the first bridge arm 21 and third bridge arm form (structure
At) the anode voltage end of anode inverter bridge or high pressure generator, the second bridge arm 22 forms cathode inverter bridge high pressure with third bridge arm
The cathode voltage end of generator.The anode that anode inverter bridge adjusts high pressure generator generates first voltage, and cathode inverter bridge is adjusted
The cathode of high pressure generator generates second voltage.First voltage is applied to the anode of X-ray tube, and second voltage is applied to the X
The cathode of ray tube.
For the first bridge arm 21, first switch device Q1 and second switch device Q2 are connected in series, first switch device Q1
Collector connection power supply Vin anode, emitter connect the first bridge arm midpoint A, the both ends of first switch device Q1 simultaneously
Join backward dioded D1；The collector of second switch device Q2 connects bridge arm midpoint A, and emitter connects the cathode of power supply Vin,
The both ends parallel connection backward dioded D2 of second switch device Q2.
For the second bridge arm 22, third switching device Q3 and the 4th switching device Q4 are connected in series, third switching device Q3
Collector connection power supply Vin anode, emitter connects bridge arm midpoint B, in parallel anti-at the both ends of third switching device Q3
To diode D3；The collector of 4th switching device Q4 connects bridge arm midpoint B, and emitter connects the cathode of power supply Vin, this
The both ends parallel connection backward dioded D4 of four switching device Q4.
For third bridge arm, the anode of the positive plate connection power supply Vin of first capacitor C1, the negative plate of first capacitor C1 connects
Meet the midpoint Com of third bridge arm；The midpoint Com of the positive plate connection third bridge arm of second capacitor C2, the cathode of the second capacitor C2
The cathode of plate connection power supply Vin.The public bridge arm being made of first capacitor C1 and the second capacitor C2 is added in inverter bridge: public
Bridge arm and Q1、Q2Composition anode inverter bridge guarantees high pressure under the control of anode kV voltage regulator and/or current regulator
The anode voltage kV_and of raw device is the half of total kV voltage instruction value；Public bridge arm and Q3、Q4Cathode inverter bridge is formed, in yin
Under the control of pole kV voltage regulator and/or current regulator, guarantee that the cathode voltage kV_cath of high pressure generator is also total kV
The half of voltage instruction value.Total kV voltage not only can be made to reach setting value, it can also be ensured that the balance of yin-yang pole tension.
Resonant cavity includes the first resonant cavity 23 and the second resonant cavity 24, and may be configured as the series connection being made of inductance and capacitor
Resonance circuit or series parallel resonance circuit.The input terminal of first resonant cavity 23 is connect with the output end of the first bridge arm 21, and first
The output end of resonant cavity 23 and the input terminal of transformer connect.Similarly, the input terminal of the second resonant cavity 24 and the second bridge arm 22
Output end connection, the input terminal of the output end of the second resonant cavity 24 and transformer connects.
Transformer may include transformer Tr1With transformer Tr2, optionally, it is mutually independent that cathode and anode may be selected in transformer
Transformer can be configured as the integrated transformer of cathode and anode.First resonant cavity 23 and transformer Tr1Electrical connection, the second resonance
Chamber 24 and transformer Tr2Electrical connection.
Voltage doubling rectifing circuit may include the first voltage doubling rectifing circuit 25, the second voltage doubling rectifing circuit 26, and first times of repoussage
The output end voltage of current circuit 25 is applied to the anode tap of X-ray tube, and the output end voltage of the second voltage doubling rectifing circuit 26 applies
In the cathode terminal of X-ray tube.Optionally, primary side can be used in transformer associated with cathode, transformer associated with anode
Two concatenated forms of primary side winding can also be used in the parallel form of winding.
Control assembly, including the first control assembly 27, the second control assembly 28, control assembly can be with inverter composition controls
Circuit controls the on-off of switching device in inverter.It should be noted that transformer can have parasitic inductance LlkAnd parasitic capacitance
Cw。
In an embodiment of the present invention, the first control assembly 27 may include voltage regulator and modulator, for controlling sun
The switching device of pole inverter bridge.Wherein, the voltage regulator of the first control assembly 27 obtains the Voltage Feedback letter acquired from anode
Difference number between (voltage) instruction value, and modulation voltage is generated according to the difference.Illustratively, Voltage Feedback letter can be calculated
Difference number with instruction value, obtains modulation voltage (modulating wave) by certain operation law, such as proportional integration operation.Voltage tune
Saving device has input terminal and output end, and the voltage regulator is either include the PI tune of adder and proportional plus integral control circuit
Device is saved, can also be other kinds of adjuster.Illustratively, the modulator of the first control assembly 27, connect with voltage regulator,
For receiving modulation voltage, and according to modulation voltage generation group driving signal, this group of driving signal for drive the first bridge arm or
Switch device conductive or cut-off in anode inverter bridge, the also referred to as on-off of driving switch device.It should be noted that first
With the on-off of control switch device, (conducting is cut the base stage of switching device in the modulator jointed anode inverter bridge of control assembly 27
Only).It should be noted that the driving signal in the present patent application is also referred to as driving pulse.
Second control assembly 28 equally may include voltage regulator and modulator, for controlling the derailing switch of cathode inverter bridge
Part.Wherein, the voltage regulator of the second control assembly 28 obtains the voltage feedback signal acquired from cathode and (voltage) instruction value
Difference, and according to the difference generate modulation voltage.Illustratively, the difference of voltage feedback signal and instruction value can be calculated, is led to
Certain operation law is crossed, as proportional integration operation obtains modulating wave.The voltage regulator of second control assembly 28 has input
End and output end, the voltage regulator can also be either the pi regulator including adder and proportional plus integral control circuit
Other kinds of adjuster.The modulator of second control assembly 28, connect with voltage regulator, for receiving modulation voltage, and
Another group of driving signal is generated according to modulation voltage, this group of driving signal is switched for driving in the second bridge arm or cathode inverter bridge
Break-over of device or cut-off, the also referred to as on-off of driving switch device.
It should be noted that the ground level of switching device is in the modulator connection cathode inverter bridge of the second control assembly 28 to control
The on-off (on or off) of switching device processed.Optionally, modulator may include pulse width (Pulse Width
Modulation, PWM) modulator or/and pulse frequency (Pulse Frequency Modulation, PFM) modulator, it is used for
Using the on-off of switching device in PWM modulation mode or PFM modulation system control inverter circuit.
The electrical connection of the input terminal of the midpoint A of first bridge arm 21 and the first resonant cavity 23；The output end of first resonant cavity 23
With transformer Tr1The input terminal of primary side winding is electrically connected；Transformer Tr1The output end of primary side winding and the midpoint of third bridge arm
Com electrical connection；Transformer Tr1The output voltage of vice-side winding and the input terminal of the first voltage doubling rectifing circuit 25 are electrically connected, i.e.,
First bridge arm 21 collectively constitutes the anode voltage end of anode inverter bridge or high pressure generator with third bridge arm.First voltage multiplying rectifier electricity
The output end on road 25 is also electrical with the input terminal of the first control assembly 27 while with the electrical connection of the anode tap of X-ray tube
Connection.The output end of first control assembly 27 can connect the base stage control terminal of inverter circuit switching device.
Similarly, the input terminal of the midpoint B of the second bridge arm 22 and the second resonant cavity 24 is electrically connected；Second resonant cavity 24
Output end and transformer Tr2The input terminal of primary side winding is electrically connected；Transformer Tr2The output end and third bridge arm of primary side winding
Midpoint Com electrical connection；Transformer Tr2The output voltage of vice-side winding and the input terminal of the second voltage doubling rectifing circuit 26 are electrical
Connection, i.e. the cathode voltage end of the second bridge arm 22 and third bridge arm composition cathode inverter bridge or high pressure generator.Second times of repoussage
The output end of current circuit 26 is while with the electrical connection of the cathode terminal of X-ray tube, the also input terminal with the second control assembly 28
Electrical connection.The output end of second control assembly 28 can be electrically connected the base stage control terminal of inverter circuit switching device.It needs
Bright, anode inverter bridge or cathode inverter bridge further include the resonant cavity being arranged between two bridge arms.
According to foregoing circuit structure, the first bridge arm 21, third bridge arm, the first resonant cavity 23, transformer Tr1, first times of repoussage
Current circuit 25 and the first control assembly 27 form the first control loop；Second bridge arm 22, the second resonant cavity 24, becomes third bridge arm
Depressor Tr2, the second voltage doubling rectifing circuit 26 and the second control assembly 28 form the second control loop.Its control process includes:
The anode voltage of first control loop independent control X-ray tube: the voltage regulator of the first control assembly 27 is penetrated from X
The anode voltage end of spool acquires first voltage feedback signal, and generates first group of driving letter according to first voltage feedback signal
Number, which controls the on-off (on or off) of switching device in the first bridge arm 21, so that the sun of X-ray tube
Pole generates first voltage.Illustratively, voltage regulator calculates first voltage feedback signal and instruction value or anode tap with reference to letter
Number KVand_refDifference, to the difference carry out proportional integration to export modulation voltage；PWM or PFM modulator receives modulation electricity
Pressure, and first group of driving signal including the first driving signal S1 and the second driving signal S2 is generated according to the modulation voltage,
In, the first driving signal S1 is supplied to the base stage control terminal of first switch device Q1, and the second driving signal S2 is supplied to second and opens
Close the base stage control terminal of device Q2.
The cathode voltage of second control loop independent control X-ray tube: the voltage regulator of the second control assembly 28 is penetrated from X
The cathode voltage end of spool acquires second voltage feedback signal, and generates second group of driving letter according to second voltage feedback signal
Number, which controls the on-off of switching device in second bridge arm 22 so that the cathode of X-ray tube generate relative to
First voltage has the second voltage of the phase shift of 180 degree.Illustratively, voltage regulator calculates second voltage feedback signal and refers to
Enable value or cathode terminal reference signal KVcath_refDifference, to the difference carry out certain rule operation, as proportional integration operation with
Export modulation voltage；PWM or PFM modulator receives modulation voltage, and being generated according to the modulation voltage includes third driving signal
Second group of driving signal of S3 and fourth drive signal S4, wherein third driving signal S3 is supplied to third switching device Q3's
Base stage, fourth drive signal S4 are supplied to the base stage of the 4th switching device Q4.
According to above-mentioned analysis, it is added in inverter circuit by capacitor C1And C2The third bridge arm (public bridge arm) of composition, can be with
One bridge arm forms anodic control end, controls the anode voltage kV_and of high pressure generator, which can also be with the second bridge arm
Cathodic control end is formed, the cathode voltage kV_cath of high pressure generator is controlled, both can guarantee that X-ray tube total voltage reaches setting
Value, moreover, reducing high pressure even if can still realize the balance of cathode and anode voltage in the case where cathode and anode current imbalance
Requirement of the raw device to cathode and anode circuit consistency, improves high pressure generator to the adaptability of unbalanced load.
Embodiment two
The difference of the present embodiment and embodiment one is that third bridge arm includes active device.It is illustrated in figure 3 embodiment two
X-ray high-voltage generator electrical block diagram, the third bridge arm (public bridge arm) of inverter circuit include be connected in series
5th switching device Q5 and the 6th switching device Q6, in the both ends parallel connection backward dioded D5 of the 5th switching device Q5, the 6th
The midpoint Com of the both ends parallel connection backward dioded D6 of switching device Q6, third bridge arm are electrically connected transformer TrPrimary side winding
Output end.The modulator for including in first control assembly 37 is PWM modulator, and the modulator for including in the second control assembly 38 is
PWM modulator.It should be noted that the transformer that the transformer used in the present embodiment integrates for cathode and anode, can also adopt certainly
With the discrete type transformer of cathode and anode as described in Figure 2.
First bridge arm 31, third bridge arm, the first resonant cavity 33, transformer Tr, the first voltage doubling rectifing circuit 35 and the first control
Component 37 processed forms the first control loop.Second bridge arm 32, third bridge arm, the second resonant cavity 34, transformer Tr, second times of repoussage
Current circuit 36 and the second control assembly 38 form the second control loop.Derailing switch in first bridge arm, the second bridge arm and third bridge arm
It is 50% that the drive signal duty cycle of part, which is concurrently set,.Its control process includes:
The phase of third bridge arm is kept to fix, the anode voltage of the voltage regulator of the first control assembly 37 from X-ray tube
End acquisition first voltage feedback signal, and first group of driving signal, first group of driving are generated according to first voltage feedback signal
Signal controls the on-off of switching device in the first bridge arm 31, so that the anode of X-ray tube generates first voltage.Illustratively, electric
Adjuster is pressed to calculate feedback signal and anode tap reference signal KVand_refDifference, to the difference carry out certain rule operation,
If proportional integration operation is to export modulation voltage；PWM modulator receives modulation voltage, and generates first according to the modulation voltage and drive
Dynamic signal S1, the second driving signal S2, wherein the first driving signal S1 is supplied to the base stage of first switch device Q1, and second drives
Dynamic signal S2 is supplied to the base stage of second switch device Q2, by control first switch device Q1, second switch device Q2 it is logical
The anode voltage of the disconnected relative phase shift control X-ray tube for adjusting the opposite third bridge arm of the first bridge arm 31；
The phase of third bridge arm is kept to fix, the anode voltage of the voltage regulator of the second control assembly 38 from X-ray tube
End acquisition second voltage feedback signal, voltage regulator calculate second voltage feedback signal and cathode terminal reference signal KVcath_ref
Difference, to the difference carry out proportional integration to export modulation voltage；PWM modulator receives modulation voltage, and according to the modulation
Voltage generates third driving signal S3, fourth drive signal S4, wherein third driving signal S3 is supplied to third switching device Q3
Base stage, fourth drive signal S4 is supplied to the base stage of the 4th switching device Q4.Second control loop passes through the second bridge arm of control
The on-off of 32 switching device adjusts the relative phase shift of the opposite third bridge arm of the second bridge arm 32, so that the cathode of X-ray tube generates
There is the second voltage of the phase shift of 180 degree relative to first voltage.It should be pointed out that modulator of the invention can also be used
The cathode and anode balance of power level process of PFM modulator, X-ray tube is similar with aforementioned process.
A kind of possible modulation waveform figure of the inverter of the embodiment of the present invention two as shown in Figure 4 a, wherein abscissa table
Show the time, ordinate indicates the moment corresponding pulse.The duty ratio of inverter circuit switching device is set to 50%: the first and opens
It closes device Q1, second switch device Q2 and uses bipolar modulation；Third switching device Q3, the 4th switching device Q4 use bipolarity
Modulation；5th switching device Q5, the 6th switching device Q6 use bipolar modulation.The phase of third bridge arm is kept to fix, first
Control loop controls the anode kV_ of high pressure generator by the phase in-migration of the opposite third bridge arm of the first bridge arm of driving signal control 31
And voltage, the second control loop control cathode kV_ by the phase in-migration of the opposite third bridge arm of the second bridge arm of driving signal control 32
Cath voltage:
In the first half cycle of a switch periods, third switching device Q3, the 5th switching device Q5 are on shape simultaneously
State, the first driving signal S1 drive first switch device Q1 in the conductive state, second switch device Q2, the 4th switching device
Q4, the 6th switching device Q6 are in off state simultaneously, do not there is current or voltage circuit, the voltage V of A point and Com point at this timeACFor
The voltage V of zero, B point and Com pointBCIt is zero；
Then, the 5th switching device Q5 ends, the 6th switching device Q6 conducting, first switch device Q1, third derailing switch
Part Q3 is still on state, and second switch device Q2, the 4th switching device Q4 are still in off state, at this point, Vin, first open
It closes device Q1, the first resonant cavity 33, the 6th switching device Q6 and forms series loop, the voltage V of A point and Com pointACFor high level；
Vin, third switching device Q3, the second resonant cavity 34, the 6th switching device Q6 form series loop, the voltage V of B point and Com pointBC
It is similarly high level；
Then, fourth drive signal S4 drives third switching device Q3 to be in off state, fourth drive signal S4 driving
4th switching device Q4 conducting, first switch device Q1, the 6th switching device Q6 are still on state, second switch device
Q2, the 5th switching device Q5 are still in off state, at this point, Vin, first switch device Q1, the first resonant cavity the 33, the 6th switch
Device Q6 still constitutes series loop, the voltage V of A point and Com pointACIt is still high level；Second resonant cavity 34, the 6th switching device
Q6, the 4th backward dioded D4 form series loop, the voltage V of B point and Com pointBCBecome low level；
Then, the first driving signal S1 drives first switch device Q1 to become off state from being connected, the second driving signal
S2 drives second switch device Q2 conducting, and third switching device Q3, the 6th switching device Q5 are still in off state, the 4th switch
Device Q4, the 6th switching device Q6 are in the conductive state, at this point, the 6th switching device Q6, the first resonant cavity 33, second reversed two
Pole pipe D2 forms series loop, the voltage V of A point and Com pointACLow level (zero) is become from high level；The voltage of B point and Com point
VBCIt is still low level；
In the later half period of a switch periods, second switch device Q2, the 4th switching device Q4, the 6th switching device Q6
Conducting, and first switch device Q1, third switching device Q3, the 5th switching device Q5 are in off state, A point and Com point
Voltage VACFor low level；The voltage V of B point and Com pointBCIt is still low level；
Then, the 5th switching device Q5 is connected, the 6th switching device Q6 cut-off, at this point, Vin, the 5th switching device Q5,
One resonant cavity 33, second switch device Q2 form series loop, the voltage V of A point and Com pointACFor high level (but and first half cycle
Current direction or setting electric current direction it is reversed, therefore be negative value)；Vin, the 5th switching device Q5, the second resonant cavity the 34, the 4th
Switching device Q4 forms series loop, the voltage V of B point and Com pointBCIt is similarly high level；
Then, third driving signal S3 drives third switching device Q3 conducting, the 4th switching device Q4 cut-off, first switch
Device Q1, the 6th switching device Q6 are still in off state, and second switch device Q2, the 5th switching device Q5 are still in conducting shape
State, at this point, Vin, the 5th switching device Q5, the first resonant cavity 33, second switch device Q2 form series loop, A point and Com point
Voltage VACFor high level (but reversed with the current direction of first half cycle, therefore be set as negative value)；The voltage of B point and Com point
VBCBecome low level；
Then, the first driving signal S1 drives first switch device Q1 conducting, and second switch device Q2 ends, at this time A point
With the voltage V of Com pointACLow level, the voltage V of B point and Com point are become from high levelBCIt is still low level.
Pass through above-mentioned analysis, the voltage V of A point and Com pointAC, B point and Com point voltage VBCWith good consistency,
Further, completely the same cathode voltage and anode voltage can be obtained in the timing for controlling driving signal.It should be noted that
The modulation waveform that the present embodiment such as 4 provides is only a kind of possible implementation of inverter circuit modulation waveform, the tune of inverter circuit
Waveform processed also may include a variety of possible modes.
As shown in Figure 4 b is the alternatively possible modulation waveform figure of the inverter of the embodiment of the present invention two, wherein abscissa
Indicate the time, ordinate indicates the moment corresponding pulse.Third bridge arm is kept still to use 50% duty ratio, and the 5th driving
Signal S5, the 6th driving signal S6 control the 5th switching device Q5 and the 6th switching device Q6 respectively, keep the phase of third bridge arm
Position is fixed；First control loop is distinguished by the inclusion of first group of driving signal of the first driving signal S1, the second driving signal S2
First switch device Q1 and second switch device Q2 is driven, adjusts the duty ratio of the first bridge arm 31 to control anode kV_and electricity
Pressure；Second control loop respectively drives by the inclusion of second group of driving signal of third driving signal S3, fourth drive signal S4
Third switching device Q3 and the 4th switching device Q4 adjusts the duty ratio of the second bridge arm 32 to control cathode kV_cath voltage.
Embodiment three
The difference of the present embodiment and embodiment two is the control mode of each switching device in inverter circuit.As shown in figure 5,
The modulator for including in first control assembly 57 is PFM modulator, and the modulator for including in the second control assembly 58 is PWM modulation
Device, and frequency synchronisation circuit 59 is connected between PFM modulator and PWM modulator.PFM modulator connects the first bridge arm 51 simultaneously
With the base stage of switching device in third bridge arm, PFM modulation is carried out to the first bridge arm 51 and third bridge arm；PWM modulator connection the
The base stage of switching device in two bridge arms 52 carries out PWM modulation to the second bridge arm 51, and frequency synchronisation circuit 59 adjusts PWM modulator
It is identical with the adjusting frequency or working frequency of PFM modulator.
The anode inverter bridge of first bridge arm 51 and third bridge arm composition, the first resonant cavity 53, transformer Tr, first times of repoussage
Current circuit 55 and the first control assembly 57 form the first control loop.The cathode inversion of second bridge arm 52 and third bridge arm composition
Bridge, the second resonant cavity 54, transformer Tr, the second voltage doubling rectifing circuit 56 and the second control assembly 58 form the second control loop.
Its control process includes:
The voltage regulator of first control assembly 57 acquires first voltage feedback signal from the anode voltage end of X-ray tube,
And first group of driving signal is generated according to the first voltage feedback signal, which controls first bridge arm 51, the
The on-off of switching device in three bridge arms, so that the anode of X-ray tube generates first voltage.Illustratively, voltage regulator calculates
Feedback signal and anode tap reference signal KVand_refDifference, to the difference carry out proportional integration to export modulation voltage；PFM
Modulator receives modulation voltage, and is generated according to the modulation voltage comprising the first driving signal S1, the second driving signal S2 and the
First group of driving signal of five driving signal S5, the 6th driving signal S6, wherein the first driving signal S1 is supplied to first switch
The base stage of device Q1, the second driving signal S2 are supplied to the base stage of second switch device Q2, and the 5th driving signal S5 is supplied to
The base stage of five switching device Q5, the 6th driving signal S6 are supplied to the base stage of the 6th switching device Q6, pass through control (adjusting)
The first bridge of on-off valve regulation of one switching device Q1, second switch device Q2, the 5th switching device Q5 and the 6th switching device Q6
Anode voltage of the arm 51 with respect to the relative phase shift control X-ray tube of third bridge arm.
At the same time, the voltage regulator of the second control assembly 58 acquires second voltage from the anode voltage end of X-ray tube
Feedback signal, voltage regulator calculate second voltage feedback signal and cathode terminal reference signal KVcath_refDifference, to the difference
Proportional integration is carried out to export modulation voltage；PWM modulator receives modulation voltage, and being generated according to the modulation voltage includes third
Second group of driving signal of driving signal S3 and fourth drive signal S4, wherein third driving signal S3 is supplied to third switch
The base stage of device Q3, fourth drive signal S4 are supplied to the base stage of the 4th switching device Q4.Second control loop passes through control the
The on-off of switching device in two bridge arms 32 adjusts the relative phase shift of the opposite third bridge arm of the second bridge arm 32, so that the yin of X-ray tube
Pole generates the second voltage for the phase shift for having 180 degree relative to first voltage.
Example IV
The difference of the present embodiment and embodiment three is the control mode of each switching device in inverter circuit.As shown in Figure 6
For the electrical block diagram of the X-ray high-voltage generator of the embodiment of the present invention, the modulator that includes in the first control assembly 67
For PWM modulator, the modulator for including in the second control assembly 68 is PFM modulator, and PFM modulator and PWM modulator it
Between be connected with frequency synchronisation circuit 69.PWM modulator connect the first bridge arm 61 in switching device base stage, to the first bridge arm 61 into
Row PWM modulation；PFM modulator connects the base stage of switching device in the second bridge arm 62 and third bridge arm simultaneously, to the second bridge arm 62
PFM modulation is carried out with third bridge arm；It is identical with the working frequency of PFM modulator that frequency synchronisation circuit 69 adjusts PWM modulator.
First bridge arm 61, third bridge arm, the first resonant cavity 63, transformer Tr, the first voltage doubling rectifing circuit 65 and the first control
Component 67 processed forms the first control loop.Second bridge arm 62, third bridge arm, the second resonant cavity 64, transformer Tr, second times of repoussage
Current circuit 66 and the second control assembly 68 form the second control loop.Its control process includes:
The voltage regulator of first control assembly 67 acquires first voltage feedback signal from the anode voltage end of X-ray tube,
Voltage regulator calculates first voltage feedback signal and anode tap reference signal KVand_refDifference, to the difference carry out ratio
Integral is to export modulation voltage；PWM modulator receives modulation voltage, and being generated according to the modulation voltage includes the first driving signal
First group of driving signal of S1 and the second driving signal S2, wherein the first driving signal S1 is supplied to first switch device Q1's
Base stage, the second driving signal S2 are supplied to the base stage of second switch device Q2.
The voltage regulator of second control assembly 68 acquires second voltage feedback signal from the anode voltage end of X-ray tube,
And according to the second voltage feedback signal control the second bridge arm 62, in third bridge arm switching device on-off so that X-ray tube
Anode generates second voltage.
Illustratively, voltage regulator calculates feedback signal and anode tap reference signal KVcath_refDifference, to the difference
Proportional integration is carried out to export modulation voltage；PFM modulator receives modulation voltage, and being generated according to the modulation voltage includes third
Second group of driving signal of driving signal S3, fourth drive signal S4, the 5th driving signal S5 and the 6th driving signal S6,
In, third driving signal S3 is supplied to the base stage of third switching device Q3, and fourth drive signal S4 is supplied to the 4th switching device
The base stage of Q4, the 5th driving signal S5 are supplied to the base stage of the 5th switching device Q5, and the 6th driving signal S6 is supplied to the 6th and opens
The base stage for closing device Q6 is opened by control third switching device Q3, the 4th switching device Q4, the 5th switching device Q5 and the 6th
The second bridge arm of on-off valve regulation 52 for closing device Q6 controls the cathode voltage of X-ray tube with respect to the relative phase shift of third bridge arm；Meanwhile
First control loop adjusts the phase of the opposite third bridge arm of the first bridge arm 61 by the on-off of switching device in the first bridge arm 61 of control
To phase shift, so that the cathode and anode of X-ray tube have the phase shift of 180 degree.
Embodiment five
Fig. 7 show the electrical block diagram of the X-ray high-voltage generator of fifth embodiment of the invention.As shown in fig. 7,
Control assembly, it may include the first control assembly 77, the second control assembly 78, control assembly can with inverter composition control circuit,
Control the on-off of switching device in inverter circuit.In the present embodiment, the first control assembly 77 includes adjuster 1, the first addition
Device 771 and second adder 773, rectification unit 774, adjuster 2 and PWM modulator 776.Equally, the second control assembly 78
Including adder 781 and 783, adjuster 1, rectification unit 784, adjuster 2 and PWM modulator 786.Optionally, high pressure
The raw adoptable transformer of device is the integrated transformer being composed in series by two primary side windings, so that control is opened in a big way
The on-off of device is closed, conducive to the loss of optimization switching device.
In this embodiment, feedback signal includes feedback voltage and feedback current, and control loop includes voltage control
Loop and current controlled circuit.Illustratively, the first control assembly 77 is fed back according to the first current feedback signal and first voltage
Signal generates one group of driving signal, this group of driving signal controls anode inverter bridge:
The input terminal input of first adder 771 is anti-with the associated first voltage of output voltage of X-ray high-voltage generator
Feedback signal and reference voltage calculate the difference of first voltage feedback signal and reference voltage (instruction value)；Adjuster 1 is voltage tune
Device is saved, carries out proportional integration for receiving the voltage difference, and to the voltage difference to export a part of modulation voltage；
The output end of one input terminal connection adjustor 1 of second adder 773 receives the load electricity of high pressure generator
Stream；First feedback of another input terminal connection of second adder 773 from high pressure generator resonant cavity or anode inverter bridge
Electric current iLS, the first feedback current iLSIt can be obtained after the rectification of rectification unit 774 multiplied by Proportional coefficient K.Second adder
773 computational load electric currents and the first feedback current iLSDifference；Adjuster 2 is current regulator, for comparing the difference
Example integral operation, exports another part modulation voltage.Two parts modulation voltage collective effect is in PWM modulator, to generate driving
Signal.The driving signal includes the first driving signal S1 and the second driving signal S2, is respectively turned on first switch device Q1 and the
The base stage of two switching device Q2, the on-off of control switch device.
Similarly, the second control assembly 78 generates another group according to the second current feedback signal and second voltage feedback signal
Driving signal, this group of driving signal control cathode inverter bridge.In second control assembly 78, the input terminal of first adder 781 is defeated
Enter with the associated second voltage feedback signal of the output voltage of X-ray high-voltage generator and reference voltage, calculate second voltage it is anti-
The difference of feedback signal and reference voltage；Adjuster 1 is voltage regulator, for receiving the voltage difference, and to the voltage difference
Proportional integration is carried out to export a part of modulation voltage；
The output end of one input terminal connection adjustor 1 of second adder 783 receives the load electricity of high pressure generator
Stream；Second feedback of another input terminal connection of second adder 783 from high pressure generator resonant cavity or anode inverter bridge
Electric current iLS, the second feedback current iLSIt can be obtained after the rectification of rectification unit 784 multiplied by Proportional coefficient K.Second adder
783 computational load electric currents and the second feedback current iLSDifference；Adjuster 2 is current regulator, for comparing the difference
Example integral operation, exports another part modulation voltage.Two parts modulation voltage collective effect is in PWM modulator, to generate driving
Signal.The driving signal includes third driving signal S3 and fourth drive signal S4, is respectively turned on third switching device Q3 and
The base stage of four switching device Q4, the on-off of control switch device.
The present embodiment uses Double closed-loop of voltage and current, and Effect Mode handoff procedure, can not improve inverter circuit
Control characteristic.
It should be noted that there is no stringent limitations for control mode of the present invention to control assembly.In another embodiment,
Voltage close loop control can be used in first control assembly 77, and voltage, current double closed-loop control can be used in the second control assembly 78.Again
In one embodiment, voltage, current double closed-loop control is can be used in the first control assembly 77, and the second control assembly 78 can be used voltage and close
Ring control.
As shown in Figure 8 a is a kind of possible modulation waveform figure of the inverter of the embodiment of the present invention five, wherein abscissa table
Show the time, ordinate indicates the moment corresponding pulse.Driving signal third bridge arm still uses 50% duty ratio, and third bridge
The phase of arm is fixed, and the first control loop (also known as anode kV control loop) controls the first bridge arm 71 by first group of driving signal
The phase in-migration of opposite third bridge arm controls anode kV_and voltage, and the second control loop (also known as cathode kV control loop) passes through the
Two groups of driving signals control the duty ratio of the second bridge arm 72 to control cathode kV_cath voltage.
As shown in Figure 8 b is the alternatively possible modulation waveform figure of the inverter of the embodiment of the present invention five, wherein abscissa
Indicate the time, ordinate indicates the moment corresponding pulse.Third bridge arm still uses 50% duty ratio, and the phase of third bridge arm
Position is fixed, and the first control loop (also known as anode kV control loop) controls the duty of the first bridge arm 71 by first group of driving signal
Than controlling anode kV_and voltage, the second control loop (also known as cathode kV control loop) passes through second group of driving signal control
The phase in-migration of the opposite third bridge arm of second bridge arm 72 controls cathode kV_cath voltage.
The X-ray high-voltage generator proposed by the present invention for having anode and cathode balance of voltage ability, by controlling yin-yang respectively
Pole tension, even if can still realize the balance of yin-yang pole tension in anode and cathode current imbalance.The present invention is whether in anode and cathode
In the case where using discrete high-tension transformer, or the case where using integrated high-tension transformer to reduce volume
Under, it can guarantee the balance of yin-yang pole tension when yin-yang electrode current has significant uneven, reduce high pressure generator pair
The requirement of yin-yang polar circuit consistency improves high pressure generator to the adaptability of unbalanced load.
Although the present invention is described with reference to current specific embodiment, those of ordinary skill in the art
It should be appreciated that above embodiment is intended merely to illustrate the present invention, can also make in the case where no disengaging spirit of that invention
Various equivalent change or replacement out, therefore, as long as to the variation of above-described embodiment, change in spirit of the invention
Type will all be fallen in the range of following claims.
Claims (8)
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| CN110212773B (en) * | 2019-06-11 | 2020-12-22 | 上海联影医疗科技股份有限公司 | Voltage switching method and device for high-voltage generator, computer equipment and storage medium |
| CN110545611B (en) * | 2019-08-09 | 2021-01-08 | 北京纳米维景科技有限公司 | Method for realizing grid control isolation and grid control circuit |
| CN110635708A (en) * | 2019-11-06 | 2019-12-31 | 上海联影医疗科技有限公司 | High-voltage direct-current power supply, high-voltage pulse modulator and radiotherapy equipment |
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| JPH07288190A (en) * | 1994-04-18 | 1995-10-31 | Hitachi Medical Corp | Inverter high-voltage generator for x-ray |
| JP3447017B2 (en) * | 1994-07-21 | 2003-09-16 | 株式会社日立メディコ | X-ray tube filament heating circuit |
| JP3669794B2 (en) * | 1996-10-24 | 2005-07-13 | 株式会社日立メディコ | Inverter X-ray high voltage device |
| JP4262810B2 (en) * | 1998-11-12 | 2009-05-13 | 株式会社日立メディコ | X-ray tube anode rotation drive device |
| JP4343491B2 (en) * | 2002-06-04 | 2009-10-14 | 株式会社日立メディコ | Inverter X-ray high voltage device |
| WO2006079985A2 (en) * | 2005-01-28 | 2006-08-03 | Koninklijke Philips Electronics N.V. | Modular power supply for x-ray tubes and method thereof |
| JPWO2012073983A1 (en) * | 2010-12-02 | 2014-05-19 | 株式会社日立メディコ | Anode rotation driving apparatus and X-ray imaging apparatus |
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