CN106783483A - 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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- CN106783483A CN106783483A CN201611088702.5A CN201611088702A CN106783483A CN 106783483 A CN106783483 A CN 106783483A CN 201611088702 A CN201611088702 A CN 201611088702A CN 106783483 A CN106783483 A CN 106783483A
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- bridge arm
- voltage
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- bridge
- high pressure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/025—X-ray tubes with structurally associated circuit elements
Abstract
The present invention provides a kind of high pressure generator, including inverter, inverter includes the first bridge arm, the second bridge arm and the 3rd bridge arm between the first bridge arm and the second bridge arm, first bridge arm, the second bridge arm include two switching devices respectively, and first bridge arm can with the 3rd bridge arm constitute anode inverter bridge, second bridge arm can constitute negative electrode inverter bridge with the 3rd bridge arm, and anode inverter bridge adjusts the anode voltage of high pressure generator, and negative electrode inverter bridge adjusts the cathode voltage of high pressure generator；The input of the first control assembly, the switching device for controlling anode inverter bridge, and the first control assembly connects the anode of high pressure generator, and output end connects first bridge arm；The input of the second control assembly, the switching device for controlling negative electrode inverter bridge, and the second control assembly connects the negative electrode of high pressure generator, and output end connects second bridge arm.High pressure generator cathode and anode of the invention is individually controlled, and improves the adaptability to unbalanced load.Additionally, the present invention also provides a kind of X-ray generator and its control method.
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 technology
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 transmitting X-ray, cathode filament is generally suspended in -70kV~-75kV current potentials, anode disc be suspended in+70kV~+
75kV current potentials, while by frame ground, 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 of this cathode and anode electric potential floating works, because filament receives thermal electron, in anode and cathode highfield
Accelerate 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, and the moon is flowed back to eventually through ground wire
Pole.Thus, the cathode and anode electric current of the X-ray tube of cathode and anode electric potential floating is caused necessarily to occur inconsistent, cathode current is even
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 institutes
The polar-symmetric circuit structure of negative and positive for showing ensures the balance of negative and positive pole tension.The X-ray tube high pressure generator includes inversion electricity
Road 11, resonator 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, the control X-ray tube of anode tap voltage doubling rectifing circuit 13
Anode voltage, cathode terminal voltage doubling rectifing circuit 14 controls the cathode voltage of X-ray tube.In inverter circuit 11, switching device Q1,
Q2 constitutes leading-bridge, switching device Q3, Q4 composition lagging leg, and each switching device is parallel with backward dioded D1- respectively
D4；Leading-bridge can (feedback circuit show by the anode voltage of the break-make of controlling switch device Q1, Q2 control high pressure generator
Go out), and anode voltage is applied to the anode tap of X-ray tube (bulb)；Lagging leg can be by the logical of controlling switch device Q3, Q4
The cathode voltage (feedback circuit is not shown) of disconnected control high pressure generator, and cathode voltage is applied to the moon of X-ray tube (bulb)
Extremely.When cathode and anode circuit symmetry preferably and cathode current icathWith anode current iandThe less situation of degree of unbalancedness
Under, the balance of cathode and anode voltage can be substantially realized using above-mentioned symmetrical structure.However, working as cathode current icathWith anode current
iandWhen degree of unbalancedness becomes big, above-mentioned control mode then it cannot be guaranteed that the balance of cathode and anode voltage, therefore to cathode and anode circuit and
The uniformity of high pressure generator has requirement higher；Especially when cathode and anode uses integrated high pressure generator, high pressure generator
Cathode current icathWith anode current iandImbalance will be more significant, and work as cathode and anode voltage unbalance factor beyond 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, being necessary to be improved the cathode and anode balance of voltage structure of existing X-ray tube high pressure generator.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of X-ray pressure high with cathode and anode balance of voltage ability
Raw device, overcomes that existing cathode and anode balanced structure is high to the coherence request of high pressure generator, adapt to the ability of unbalanced load
Problem.
In order to solve the above technical problems, some embodiments of the present invention provide a kind of high pressure generator, including：
Inverter, the inverter includes the first bridge arm, the second bridge arm and positioned at first bridge arm and the second bridge arm
Between the 3rd bridge arm, first bridge arm, the second bridge arm include two switching devices respectively, and first bridge arm can be with the
Three bridge arms constitute anode inverter bridge, and second bridge arm can constitute negative electrode inverter bridge, the anode inversion with the 3rd bridge arm
Bridge adjusts the anode voltage of the high pressure generator, and the negative electrode inverter bridge adjusts the cathode voltage of the high pressure generator；
First control assembly, the switching device for controlling the anode inverter bridge, and first control assembly is defeated
Enter the anode of the end connection high pressure generator, the output end of first control assembly connects first bridge arm；
The input of the second control assembly, the switching device for controlling negative electrode inverter bridge, and second control assembly
The negative electrode of the high pressure generator is connected, the output end of second control assembly connects second bridge arm.
Alternatively, first control assembly includes voltage regulator and modulator, and the voltage regulator is used to obtain
Difference between the anode collection voltages feedback signal and command value of the high pressure generator, and tune is produced according to the difference
Voltage processed；The modulator, is connected with the voltage regulator, for receiving the modulation voltage, and according to the modulation electricity
Pressure produces first group of drive signal, and first group of drive signal is for driving the switch device conductive of first bridge arm or cutting
Only；
Second control assembly includes voltage regulator and modulator, and the voltage regulator is used to obtain from the height
The difference between the negative electrode collection voltages feedback signal and command value of generator is pressed, and modulation voltage is produced according to the difference；
The modulator, is connected with the voltage regulator, for receiving the modulation voltage, and produces the according to the modulation voltage
Two groups of drive signals, second group of drive signal is used to drive switch device conductive or the cut-off of second bridge arm.
Alternatively, the 3rd bridge arm includes two switching devices of series connection.
Alternatively, first electric capacity and second electric capacity of the 3rd bridge arm comprising series connection.
Alternatively, the modulator includes PWM modulator or PFM modulators, is adopted with to first bridge arm, the second bridge arm
The break-make of the switching device is controlled with PWM mode；
Or, the break-make of the switching device is controlled first bridge arm, the second bridge arm using PFM modulation systems.
Alternatively, first control assembly includes PFM modulators, and second control assembly includes PWM modulator, institute
PFM modulators are stated while connecting first bridge arm and the 3rd bridge arm, the PWM modulator connects second bridge arm, and institute
State rate of connections synchronous circuit between PWM modulator and PFM modulators.
A kind of X-ray generator is proposed according to another aspect of the present invention, including：High pressure generator and X-ray tube,
The X-ray tube has negative electrode and anode, and the high pressure generator includes：
Inverter, the inverter includes the first bridge arm, the second bridge arm and positioned at first bridge arm and the second bridge arm
Between the 3rd bridge arm, first bridge arm, the second bridge arm include two switching devices, and first bridge arm and the 3rd respectively
Bridge arm constitutes anode inverter bridge, and second bridge arm constitutes negative electrode inverter bridge with the 3rd bridge arm, and the anode inverter bridge is adjusted
The anode voltage of the high pressure generator is saved, the cathode voltage control inverter bridge adjusts the negative electrode 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 negative electrode of the X-ray tube；
First control assembly, can with the anode inverter bridge composition control loop, and first control assembly input
The anode of the end connection high pressure generator, the output end of first control assembly connects first bridge arm；
Second control assembly, can with the negative electrode inverter bridge composition control loop, and second control assembly input
The negative electrode of the end connection high pressure generator, the output end of second control assembly connects second bridge arm.
According to another aspect of the invention, a kind of control method of X-ray generator is proposed, the X-ray produces dress
Put including high pressure generator and X-ray tube, the X-ray tube has negative electrode and anode, the high pressure generator includes：
Inverter, the inverter includes the first bridge arm, the second bridge arm and positioned at first bridge arm and the second bridge arm
Between the 3rd bridge arm, first bridge arm, the second bridge arm include two switching devices, and first bridge arm and the 3rd respectively
Bridge arm constitutes anode inverter bridge, and second bridge arm constitutes negative electrode inverter bridge with the 3rd bridge arm, and the anode inverter bridge is adjusted
The anode voltage of the high pressure generator is saved, the negative electrode inverter bridge adjusts the cathode voltage of the high pressure generator；
The control method includes：
First voltage feedback signal is gathered from the anode of the high pressure generator, and according to the first voltage feedback signal
First group of drive signal, first group of drive signal is produced to control the anode inverter bridge so that the high pressure generator
Anode produces first voltage；And,
Second voltage feedback signal is gathered from the negative electrode of the high pressure generator, and according to the second voltage feedback signal
Second group of drive signal, second group of drive signal is produced to control the negative electrode inverter bridge so that the high pressure generator
Negative electrode produces 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
Negative electrode.
Alternatively, also include：
The first current feedback signal is gathered from the anode inverter bridge, according to first current feedback signal and the first electricity
Pressure feedback signal controls the anode inverter bridge；
The second current feedback signal is gathered from the negative electrode inverter bridge, according to second current feedback signal and the second electricity
Pressure feedback signal controls the negative electrode inverter bridge.
Alternatively, the 3rd bridge arm includes two switching devices, and first group of drive signal uses PFM regulative modes
First bridge arm, the break-make of the 3rd bridge arm breaker in middle device are controlled simultaneously, and second group of drive signal uses PWN regulation sides
Formula controls the break-make of the second bridge arm breaker in middle device, and first bridge arm, the second bridge arm and the 3rd bridge arm regulation frequently
Rate is identical.
Compared with prior art, beneficial effects of the present invention are：Inverter includes the first bridge arm, the second bridge that are set up in parallel
Arm and the 3rd bridge arm, the first bridge arm and the 3rd bridge arm composition anode inverter bridge, the second bridge arm are inverse with the 3rd bridge arm composition negative electrode
Become bridge, anode inverter bridge adjusts the anode voltage of high pressure generator, and negative electrode inverter bridge adjusts the cathode voltage of high pressure generator,
During 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 is distinguished
Individually control, is applicable to the transformer of high-tension transformer situation integrally or separately, reduces high pressure generator to cathode and anode electricity
The requirement of road uniformity, improves adaptability of the high pressure generator to unbalanced load；Control loop can use PWM or PFM with
And the mode of both any combination, improve flexibility and the diversity of high pressure generator control.
Brief description of the drawings
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 are a kind of possible modulation waveform figure of the inverter of the embodiment of the present invention two；
Fig. 4 b are 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 are a kind of possible modulation waveform of the inverter of the embodiment of the present invention five；
Fig. 8 b are the alternatively possible modulation waveform figure of the inverter of the embodiment of the present invention five.
Specific embodiment
It is that the above objects, features and advantages of the present invention can be become apparent, below in conjunction with accompanying drawing to tool of the invention
Body implementation method elaborates.
Many details are elaborated in the following description in order to fully understand the present invention, but the present invention can be with
Other manner described here is different from using other to implement, therefore the present invention is not limited by following public specific embodiment
System.
Embodiments of the invention describe 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)
In etc. equipment, but it is not limited thereto.
In certain embodiments, the X-ray tube high pressure generator with cathode and anode balance of voltage ability includes inversion electricity
Road, the change circuit comprises at least three bridge arms, it is ensured that in the case of the cathode and anode current imbalance of X-ray tube, can still realize
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), resonator, transformer, voltage doubling rectifing circuit and control assembly.
Inverter circuit is by first switch device Q1, second switch device Q2, the 3rd switching device Q3, the 4th switching device
Q4, the first electric capacity C1, the second electric capacity C2 compositions.Wherein, first switch device Q1 and second switch device Q2 are composed in series first
Bridge arm (leading-bridge) 21；3rd switching device Q3 and the 4th switching device Q4 are composed in series the second bridge arm (lagging leg) 22；
First electric capacity C1 and the second electric capacity C2 are composed in series the 3rd bridge arm (public bridge arm), the 3rd bridge arm be arranged on 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 are constituted.First switch device to the 4th switching device Q1-Q4 can be transistor switching circuit, field effect transistor switch circuit
(metal-oxide-semiconductor on-off 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 the 3rd bridge arm, and the first bridge arm 21 and the 3rd bridge arm composition (structure
Into) the anode voltage end of anode inverter bridge or high pressure generator, the second bridge arm 22 and the 3rd bridge arm composition negative electrode inverter bridge high pressure
The cathode voltage end of generator.The anode of anode inverter bridge regulation high pressure generator produces first voltage, the regulation of negative electrode inverter bridge
The negative electrode of high pressure generator produces second voltage.First voltage is applied to the anode of X-ray tube, and second voltage is applied to the X
The negative electrode of ray tube.
For the first bridge arm 21, first switch device Q1 is connected in series with second switch device Q2, first switch device Q1
Colelctor electrode connection power supply Vin positive pole, emitter stage connects the first bridge arm midpoint A, at the two ends of first switch device Q1 simultaneously
Connection backward dioded D1；The colelctor electrode connection bridge arm midpoint A of second switch device Q2, the negative pole of emitter stage connection power supply Vin,
The two ends of second switch device Q2 backward dioded D2 in parallel.
For the second bridge arm 22, the 3rd switching device Q3 and the 4th switching device Q4 is connected in series, the 3rd switching device Q3
Colelctor electrode connection power supply Vin positive pole, emitter stage connection bridge arm midpoint B is in parallel anti-at the two ends of the 3rd switching device Q3
To diode D3；The colelctor electrode connection bridge arm midpoint B of the 4th switching device Q4, the negative pole of emitter stage connection power supply Vin, this
The two ends of four switching device Q4 backward dioded D4 in parallel.
For the 3rd bridge arm, the positive pole of the positive plate connection power supply Vin of the first electric capacity C1, the negative plate of the first electric capacity C1 connects
Meet the midpoint Com of the 3rd bridge arm；The positive plate of the second electric capacity C2 connects the midpoint Com of the 3rd bridge arm, the negative pole of the second electric capacity C2
The negative pole of plate connection power supply Vin.The public bridge arm being made up of the first electric capacity C1 and the second electric capacity C2 is added in inverter bridge：It is public
Bridge arm and Q1、Q2Composition anode inverter bridge, under the control of anode kV voltage regulators and/or current regulator, it is ensured that pressure high
The anode voltage kV_and of raw device is the half of total kV voltage instruction values；Public bridge arm and Q3、Q4Composition negative electrode inverter bridge, in the moon
Under the control of pole kV voltage regulators and/or current regulator, it is ensured that the cathode voltage kV_cath of high pressure generator is also total kV
The half of voltage instruction value.Total kV voltages so can be not only made to reach setting value, it can also be ensured that the balance of negative and positive pole tension.
Resonator includes the first resonator 23 and the second resonator 24, and may be configured as the series connection being made up of inductance and electric capacity
Resonance circuit or series parallel resonance circuit.The input of the first resonator 23 is connected with the output end of the first bridge arm 21, and first
The output end of resonator 23 is connected with the input of transformer.Similarly, the input of the second resonator 24 and the second bridge arm 22
Output end connection, the output end of the second resonator 24 is connected with the input of transformer.
Transformer may include transformer Tr1With transformer Tr2, alternatively, it is separate that transformer may be selected cathode and anode
Transformer, can be configured as the integrated transformer of cathode and anode.First resonator 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.Alternatively, the transformer that the transformer being associated with negative electrode is associated with anode can use primary side
The parallel form of winding, also can be in the form of two primary side winding series connection.
Control assembly, including the first control assembly 27, the second control assembly 28, control assembly can be with inverter composition control
Loop, controls the break-make of inverter breaker in middle device.It should be noted that transformer can have stray 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 from anode collection
Number and the difference between (voltage) command value, and according to the difference produce modulation voltage.Exemplarily, Voltage Feedback letter can be calculated
Difference number with command value, by certain operation law, such as proportional integral computing obtains modulation voltage (modulating wave).Voltage is adjusted
Section utensil has input and output end, and the voltage regulator both can be to include that adder and the PI of proportional plus integral control circuit are adjusted
Section device, may also be other kinds of adjuster.Exemplarily, the modulator of the first control assembly 27, is connected with voltage regulator,
For receiving modulation voltage, and according to modulation voltage generation group drive signal, this group of drive signal be used to driving the first bridge arm or
Anode inverter bridge breaker in middle break-over of device or cut-off, the also referred to as break-make of driving switch device.It should be noted that first
With the break-make of controlling switch device, (conducting cuts the base stage of the modulator jointed anode inverter bridge breaker in middle device of control assembly 27
Only).It should be noted that the drive signal in the present patent application is also referred to as driving pulse.
Second control assembly 28 equally may include voltage regulator and modulator, the derailing switch for controlling negative electrode inverter bridge
Part.Wherein, the voltage regulator of the second control assembly 28 obtains the voltage feedback signal and (voltage) command value from negative electrode collection
Difference, and according to the difference produce modulation voltage.Exemplarily, the difference of voltage feedback signal and command value can be calculated, is led to
Certain operation law is crossed, such as proportional integral computing obtains modulating wave.The voltage regulator of the second control assembly 28 has input
End and output end, the voltage regulator both can be the pi regulator for including adder and proportional plus integral control circuit, may also be
Other kinds of adjuster.The modulator of the second control assembly 28, is connected with voltage regulator, for receiving modulation voltage, and
Another group of drive signal is produced according to modulation voltage, this group of drive signal is for driving the second bridge arm or negative electrode inverter bridge breaker in middle
Break-over of device or cut-off, the also referred to as break-make of driving switch device.
It should be noted that the modulator of the second control assembly 28 connects the ground level of negative electrode inverter bridge breaker in middle device to control
The break-make (on or off) of switching device processed.Alternatively, modulator may include pulse width (Pulse Width
Modulation, PWM) modulator or/and pulse frequency (Pulse Frequency Modulation, PFM) modulator, it is used for
The break-make of inverter circuit breaker in middle device is controlled using PWM mode or PFM modulation systems.
The input electrical connection of the midpoint A of the first bridge arm 21 and the first resonator 23；The output end of the first resonator 23
With transformer Tr1The input electrical connection of primary side winding；Transformer Tr1The midpoint of the output end of primary side winding and the 3rd bridge arm
Com is electrically connected；Transformer Tr1The input electrical connection of the output voltage of vice-side winding and the first voltage doubling rectifing circuit 25, i.e.,
First bridge arm 21 and the 3rd bridge arm collectively constitute the anode voltage end of anode inverter bridge or high pressure generator.First voltage multiplying rectifier electricity
While the anode tap with X-ray tube is electrically connected, also the input with the first control assembly 27 is electric for the output end on road 25
Connection.The output end of the first control assembly 27 can connect the base stage control end of inverter circuit switching device.
Similarly, the input electrical connection of the midpoint B of the second bridge arm 22 and the second resonator 24；Second resonator 24
Output end and transformer Tr2The input electrical connection of primary side winding；Transformer Tr2The output end of primary side winding and the 3rd bridge arm
Midpoint Com electrical connection；Transformer Tr2The output voltage of vice-side winding is electric with the input of the second voltage doubling rectifing circuit 26
The cathode voltage end of connection, i.e. the second bridge arm 22 and the 3rd bridge arm composition negative electrode inverter bridge or high pressure generator.Second times of repoussage
The output end of current circuit 26 with X-ray tube cathode terminal be electrically connected while, also with the input of the second control assembly 28
Electrical connection.The output end of the second control assembly 28 can be electrically connected the base stage control end of inverter circuit switching device.Need
Bright, anode inverter bridge or negative electrode inverter bridge also include the resonator being arranged between two bridge arms.
According to foregoing circuit structure, the first bridge arm 21, the 3rd bridge arm, the first resonator 23, transformer Tr1, first times of repoussage
25 and first control assembly of current circuit 27 constitutes the first control loop；Second bridge arm 22, the 3rd bridge arm, the second resonator 24, change
Depressor Tr2, the second voltage doubling rectifing circuit 26 and the second control assembly 28 constitute the second control loop.Its control process includes：
The anode voltage of the 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 collection first voltage feedback signal of spool, and first group of driving letter is produced according to first voltage feedback signal
Number, first group of drive signal controls the break-make (on or off) of the breaker in middle device of the first bridge arm 21 so that the sun of X-ray tube
Pole produces first voltage.Exemplarily, voltage regulator calculates first voltage feedback signal with command value or anode tap with reference to letter
Number KVand_refDifference, the difference is carried out proportional integral to export modulation voltage；PWM or PFM modulators receive modulation electricity
Pressure, and first group of drive signal of the first drive signal S1 and the second drive signal S2 is included according to modulation voltage generation, its
In, the first drive signal S1 is supplied to the base stage control end of first switch device Q1, and the second drive signal S2 is supplied to second to open
Close the base stage control end of device Q2.
The cathode voltage of the 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 collection second voltage feedback signal of spool, and second group of driving letter is produced according to second voltage feedback signal
Number, second group of drive signal controls break-make of the breaker in middle device of the second bridge arm 22 so that the negative electrode of X-ray tube produce relative to
First voltage has the second voltage of the phase shift of 180 degree.Exemplarily, voltage regulator calculates second voltage feedback signal and refers to
Make value or cathode terminal reference signal KVcath_refDifference, carry out the computing of certain rule to the difference, such as proportional integral computing with
Output modulation voltage；PWM or PFM modulators receive modulation voltage, and include the 3rd drive signal according to modulation voltage generation
Second group of drive signal of S3 and fourth drive signal S4, wherein, the 3rd drive signal S3 is supplied to the 3rd switching device Q3's
Base stage, fourth drive signal S4 is supplied to the base stage of the 4th switching device Q4.
Added according to above-mentioned analysis, in inverter circuit by electric capacity C1And C23rd bridge arm (public bridge arm) of composition, can be with the
One bridge arm composition anodic control end, controls the anode voltage kV_and of high pressure generator, and the 3rd bridge arm also can be with the second bridge arm
Composition cathodic control end, controls the cathode voltage kV_cath of high pressure generator, can both ensure that X-ray tube total voltage reached setting
Value, and, even if in the case of cathode and anode current imbalance, can still realize the balance of cathode and anode voltage, reduce pressure high
Requirement of the raw device to cathode and anode circuit uniformity, improves adaptability of the high pressure generator to unbalanced load.
Embodiment two
The present embodiment is that the 3rd bridge arm includes active device with the difference of embodiment one.It is illustrated in figure 3 embodiment two
X-ray high-voltage generator electrical block diagram, the 3rd bridge arm (public bridge arm) of inverter circuit includes what is be connected in series
5th switching device Q5 and the 6th switching device Q6, in the two ends parallel connection backward dioded D5 of the 5th switching device Q5, the 6th
The two ends parallel connection backward dioded D6 of switching device Q6, the midpoint Com electrical connection transformers T of the 3rd bridge armrPrimary side winding
Output end.The modulator included in first control assembly 37 is PWM modulator, and the modulator included in the second control assembly 38 is
PWM modulator.It should be noted that the transformer used in the present embodiment is the integrated transformer of 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, the 3rd bridge arm, the first resonator 33, transformer Tr, the first voltage doubling rectifing circuit 35 and the first control
Component processed 37 constitutes the first control loop.Second bridge arm 32, the 3rd bridge arm, the second resonator 34, transformer Tr, second times of repoussage
36 and second control assembly of current circuit 38 constitutes the second control loop.First bridge arm, the second bridge arm and the 3rd bridge arm breaker in middle device
It is 50% that the drive signal dutycycle of part concurrently sets.Its control process includes：
The phase of the 3rd bridge arm is kept to fix, the anode voltage of the voltage regulator of the first control assembly 37 from X-ray tube
End collection first voltage feedback signal, and first group of drive signal, first group of driving are produced according to first voltage feedback signal
Signal controls the break-make of the breaker in middle device of the first bridge arm 31 so that the anode of X-ray tube produces first voltage.Exemplarily, electricity
Pressure adjuster calculates feedback signal and anode tap reference signal KVand_refDifference, the computing of certain rule is carried out to the difference,
If proportional integral computing is exporting modulation voltage；PWM modulator receives modulation voltage, and produces first to drive according to the modulation voltage
Dynamic signal S1, the second drive signal S2, wherein, the first drive 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 relative phase shift of relative 3rd bridge arm of disconnected the first bridge arm of regulation 31 controls the anode voltage of X-ray tube；
The phase of the 3rd bridge arm is kept to fix, the anode voltage of the voltage regulator of the second control assembly 38 from X-ray tube
End collection second voltage feedback signal, voltage regulator calculates second voltage feedback signal and cathode terminal reference signal KVcath_ref
Difference, the difference is carried out proportional integral to export modulation voltage；PWM modulator receives modulation voltage, and according to the modulation
Voltage produces the 3rd drive signal S3, fourth drive signal S4, wherein, the 3rd drive signal S3 is supplied to the 3rd switching device Q3
Base stage, fourth drive signal S4 is supplied to the base stage of the 4th switching device Q4.Second control loop is by controlling the second bridge arm
The break-make of 32 switching device, the relative phase shift of relative 3rd bridge arm of the second bridge arm of regulation 32 so that the negative electrode of X-ray tube is produced
Relative to the second voltage of the phase shift that first voltage has 180 degree.It is pointed out that modulator of the invention can also be used
PFM modulators, the cathode and anode balance of power level process of 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, wherein abscissa table as shown in Figure 4 a
Show the time, ordinate represents the moment corresponding pulse.The dutycycle of inverter circuit switching device is set to 50%：First opens
Close device Q1, second switch device Q2 and use bipolar modulation；3rd 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 the 3rd bridge arm is kept to fix, first
Control loop controls the phase in-migration of relative 3rd bridge arm of the first bridge arm 31 to control the anode kV_ of high pressure generator by drive signal
And voltages, the second control loop controls the phase in-migration of relative 3rd bridge arm of the second bridge arm 32 to control negative electrode kV_ by drive signal
Cath voltages：
In a first half cycle for switch periods, the 3rd switching device Q3, the 5th switching device Q5 are on shape simultaneously
State, the first drive signal S1 drives first switch device Q1 in the conduction state, second switch device Q2, the 4th switching device
Q4, the 6th switching device Q6 are in cut-off state simultaneously, do not there is the voltage V in curtage loop, A points and Com points nowACFor
The voltage V of zero, B point and Com pointsBCIt is zero；
Then, the 5th switching device Q5 cut-offs, the 6th switching device Q6 conductings, first switch device Q1, the 3rd derailing switch
, still in conducting state, second switch device Q2, the 4th switching device Q4 are still in cut-off state, now, V for part Q3in, first open
Close the voltage V of device Q1, the first resonator 33, the 6th switching device Q6 composition series loops, A points and Com pointsACIt is high level；
Vin, the 3rd switching device Q3, the second resonator 34, the 6th switching device Q6 composition series loops, the voltage V of B points and Com pointsBC
It is similarly high level；
Then, fourth drive signal S4 drives the 3rd switching device Q3 to be in cut-off state, and fourth drive signal S4 drives
4th switching device Q4 is turned on, and first switch device Q1, the 6th switching device Q6 are still in conducting state, second switch device
Q2, the 5th switching device Q5 are still in cut-off state, now, Vin, first switch device Q1, the first resonator the 33, the 6th switch
Device Q6 still constitutes the voltage V of series loop, A points and Com pointsACStill it is high level；Second resonator 34, the 6th switching device
Q6, the 4th backward dioded D4 constitute the voltage V of series loop, B points and Com pointsBCIt is changed into low level；
Then, the first drive signal S1 drives first switch device Q1 to be changed into cut-off state from turning on, the second drive signal
S2 drives second switch device Q2 conductings, and, still in cut-off state, the 4th switchs for the 3rd switching device Q3, the 6th switching device Q5
Device Q4, the 6th switching device Q6 are in the conduction state, now, the 6th switching device Q6, the first resonator 33, second reverse two
Pole pipe D2 constitutes the voltage V of series loop, A points and Com pointsACLow level (zero) is changed into from high level；The voltage of B points and Com points
VBCStill it is low level；
In a later half cycle for switch periods, second switch device Q2, the 4th switching device Q4, the 6th switching device Q6
Conducting, and first switch device Q1, the 3rd switching device Q3, the 5th switching device Q5 are in cut-off state, A points and Com points
Voltage VACIt is low level；The voltage V of B points and Com pointsBCStill it is low level；
Then, the 5th switching device Q5 conductings, the 6th switching device Q6 cut-offs, now, Vin, the 5th switching device Q5,
The voltage V of one resonator 33, second switch device Q2 composition series loops, A points and Com pointsACIt is high level (but and first half cycle
The sense of current or setting electric current direction reversely, therefore be negative value)；Vin, the 5th switching device Q5, the second resonator the 34, the 4th
Switching device Q4 constitutes the voltage V of series loop, B points and Com pointsBCIt is similarly high level；
Then, the 3rd drive signal S3 drives the 3rd switching device Q3 conductings, the 4th switching device Q4 cut-offs, first switch
, still in cut-off state, second switch device Q2, the 5th switching device Q5 are still in conducting shape for device Q1, the 6th switching device Q6
State, now, Vin, the 5th switching device Q5, the first resonator 33, second switch device Q2 composition series loops, A points and Com points
Voltage VACIt is high level (but, therefore be set as negative value) with the sense of current of first half cycle reversely；The voltage of B points and Com points
VBCIt is changed into low level；
Then, the first drive signal S1 drives first switch device Q1 conductings, and second switch device Q2 ends, now A points
With the voltage V of Com pointsACIt is changed into the voltage V of low level, B points and Com points from high levelBCStill it is low level.
By above-mentioned analysis, the voltage V of A points and Com pointsAC, B points and Com points voltage VBCWith good uniformity,
Further, the sequential of drive signal is controlled, completely the same cathode voltage and anode voltage is can obtain.It should be noted that
A kind of possible implementation of the modulation waveform that the present embodiment such as 4 is given only inverter circuit modulation waveform, the tune of inverter circuit
Waveform processed can also include various possible modes.
It is as shown in Figure 4 b the alternatively possible modulation waveform figure of the inverter of the embodiment of the present invention two, wherein abscissa
Expression time, ordinate represents the moment corresponding pulse.Keep the 3rd bridge arm still using 50% dutycycle, and the 5th driving
Signal S5, the 6th drive signal S6 control the 5th switching device Q5 and the 6th switching device Q6 respectively, keep the phase of the 3rd bridge arm
Position is fixed；First control loop is distinguished by first group of drive signal comprising the first drive signal S1, the second drive signal S2
First switch device Q1 and second switch device Q2 is driven, adjusts the dutycycle of the first bridge arm 31 to control anode kV_and electricity
Pressure；Second control loop is driven respectively by second group of drive signal comprising the 3rd drive signal S3, fourth drive signal S4
3rd switching device Q3 and the 4th switching device Q4, adjusts the dutycycle of the second bridge arm 32 to control negative electrode kV_cath voltages.
Embodiment three
The present embodiment and the control mode that the difference of embodiment two is each switching device in inverter circuit.As shown in figure 5,
The modulator included in first control assembly 57 is PFM modulators, and the modulator included in the second control assembly 58 is PWM
Frequency synchronisation circuit 59 is connected between device, and PFM modulators and PWM modulator.PFM modulators connect the first bridge arm 51 simultaneously
With the base stage of the 3rd bridge arm breaker in middle device, PFM modulation is carried out to the first bridge arm 51 and the 3rd bridge arm；PWM modulator connection the
The base stage of the breaker in middle device of two bridge arm 52, PWM, the regulation PWM modulator of frequency synchronisation circuit 59 are carried out to the second bridge arm 51
Regulating frequency or working frequency with PFM modulators is identical.
Anode inverter bridge, the first resonator 53, the transformer T of the first bridge arm 51 and the 3rd bridge arm compositionr, first times of repoussage
55 and first control assembly of current circuit 57 constitutes the first control loop.The negative electrode inversion of the second bridge arm 52 and the 3rd bridge arm composition
Bridge, the second resonator 54, transformer Tr, the second voltage doubling rectifing circuit 56 and the second control assembly 58 constitute the second control loop.
Its control process includes：
The voltage regulator of the first control assembly 57 gathers first voltage feedback signal from the anode voltage end of X-ray tube,
And first group of drive signal is produced according to the first voltage feedback signal, first group of drive signal controls first bridge arm 51, the
The break-make of three bridge arm breaker in middle devices so that the anode of X-ray tube produces first voltage.Exemplarily, voltage regulator is calculated
Feedback signal and anode tap reference signal KVand_refDifference, the difference is carried out proportional integral to export modulation voltage；PFM
Modulator receives modulation voltage, and is produced comprising the first drive signal S1, the second drive signal S2 and the according to the modulation voltage
First group of drive signal of five drive signal S5, the 6th drive signal S6, wherein, the first drive signal S1 is supplied to first switch
The base stage of device Q1, the second drive signal S2 is supplied to the base stage of second switch device Q2, and the 5th drive signal S5 is supplied to
The base stage of five switching device Q5, the 6th drive signal S6 is supplied to the base stage of the 6th switching device Q6, by controlling (regulation) the
One switching device Q1, second switch device Q2, the bridge of on-off valve regulation first of the 5th switching device Q5 and the 6th switching device Q6
Arm 51 controls the anode voltage of X-ray tube with respect to the relative phase shift of the 3rd bridge arm.
At the same time, the voltage regulator of the second control assembly 58 gathers second voltage from the anode voltage end of X-ray tube
Feedback signal, voltage regulator calculates second voltage feedback signal and cathode terminal reference signal KVcath_refDifference, to the difference
Proportional integral is carried out to export modulation voltage；PWM modulator receives modulation voltage, and is produced comprising the 3rd according to the modulation voltage
Second group of drive signal of drive signal S3 and fourth drive signal S4, wherein, the 3rd drive signal S3 is supplied to the 3rd switch
The base stage of device Q3, fourth drive signal S4 is supplied to the base stage of the 4th switching device Q4.Second control loop is by control the
The break-make of the breaker in middle device of two bridge arm 32, the relative phase shift of relative 3rd bridge arm of the second bridge arm of regulation 32 so that the moon of X-ray tube
Pole produces the second voltage of the phase shift relative to first voltage with 180 degree.
Example IV
The present embodiment and the control mode that the difference of embodiment three is each switching device in inverter circuit.As shown in Figure 6
It is the electrical block diagram of the X-ray high-voltage generator of the embodiment of the present invention, the modulator included in the first control assembly 67
Be PWM modulator, the modulator included in the second control assembly 68 is PFM modulators, and PFM modulators and PWM modulator it
Between be connected with frequency synchronisation circuit 69.PWM modulator connects the base stage of the breaker in middle device of the first bridge arm 61, and the first bridge arm 61 is entered
Row PWM；PFM modulators connect the base stage of the second bridge arm 62 and the 3rd bridge arm breaker in middle device simultaneously, to the second bridge arm 62
PFM modulation is carried out with the 3rd bridge arm；The regulation PWM modulator of frequency synchronisation circuit 69 is identical with the working frequency of PFM modulators.
First bridge arm 61, the 3rd bridge arm, the first resonator 63, transformer Tr, the first voltage doubling rectifing circuit 65 and the first control
Component processed 67 constitutes the first control loop.Second bridge arm 62, the 3rd bridge arm, the second resonator 64, transformer Tr, second times of repoussage
66 and second control assembly of current circuit 68 constitutes the second control loop.Its control process includes：
The voltage regulator of the first control assembly 67 gathers 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, ratio is carried out to the difference
Integrate to export modulation voltage；PWM modulator receives modulation voltage, and is produced comprising the first drive signal according to the modulation voltage
First group of drive signal of S1 and the second drive signal S2, wherein, the first drive signal S1 is supplied to first switch device Q1's
Base stage, the second drive signal S2 is supplied to the base stage of second switch device Q2.
The voltage regulator of the second control assembly 68 gathers second voltage feedback signal from the anode voltage end of X-ray tube,
And the break-make of the second bridge arm 62, the 3rd bridge arm breaker in middle device is controlled according to the second voltage feedback signal so that X-ray tube
Anode produces second voltage.
Exemplarily, voltage regulator calculates feedback signal and anode tap reference signal KVcath_refDifference, to the difference
Proportional integral is carried out to export modulation voltage；PFM modulators receive modulation voltage, and are produced comprising the 3rd according to the modulation voltage
Drive signal S3, fourth drive signal S4, second group of drive signal of the 5th drive signal S5 and the 6th drive signal S6, its
In, the 3rd drive signal S3 is supplied to the base stage of the 3rd switching device Q3, and fourth drive signal S4 is supplied to the 4th switching device
The base stage of Q4, the 5th drive signal S5 is supplied to the base stage of the 5th switching device Q5, and the 6th drive signal S6 is supplied to the 6th to open
The base stage of device Q6 is closed, is opened by controlling the 3rd 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 the 3rd bridge arm；Meanwhile,
The break-make that first control loop passes through the control breaker in middle device of the first bridge arm 61, the phase of relative 3rd bridge arm of the first bridge arm of regulation 61
To phase shift so that the negative electrode 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 loop,
Control the break-make of inverter circuit breaker in middle device.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.Alternatively, pressure high
The raw adoptable transformer of device is the integrated transformer being composed in series by two primary side windings, so as to be opened in interior control in a big way
The break-make of device is closed, beneficial to the loss of optimization switching device.
In this specific embodiment, feedback signal includes feedback voltage and feedback current, and control loop includes voltage control
Loop and current controlled circuit.Exemplarily, the first control assembly 77 is fed back according to the first current feedback signal and first voltage
Signal produces one group of drive signal, this group of drive signal to control anode inverter bridge：
The input input of first adder 771 is anti-with the first voltage that the output voltage of X-ray high-voltage generator is associated
Feedback signal and reference voltage, calculate the difference of first voltage feedback signal and reference voltage (command value)；Adjuster 1 is adjusted for voltage
Section device, for receiving the voltage difference, and carries out proportional integral to export a part of modulation voltage to the voltage difference；
One output end of input connection adjustor 1 of second adder 773, receives the load electricity of high pressure generator
Stream；First feedback of another input connection of second adder 773 from high pressure generator resonator or anode inverter bridge
Electric current iLS, the first feedback current iLSCan be by after the rectification of rectification unit 774, being multiplied by Proportional coefficient K and obtaining.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 in PWM modulator, to produce driving
Signal.The drive signal includes the first drive signal S1 and the second drive signal S2, is respectively turned on first switch device Q1 and the
The base stage of two switching device Q2, the break-make of controlling switch device.
Similarly, the second control assembly 78 produces another group according to the second current feedback signal and second voltage feedback signal
Drive signal, this group of drive signal controls negative electrode inverter bridge.In second control assembly 78, the input of first adder 781 is defeated
Enter the second voltage feedback signal and reference voltage associated with the output voltage of X-ray high-voltage generator, calculate second voltage 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 integral is carried out to export a part of modulation voltage；
One output end of input connection adjustor 1 of second adder 783, receives the load electricity of high pressure generator
Stream；Second feedback of another input connection of second adder 783 from high pressure generator resonator or anode inverter bridge
Electric current iLS, the second feedback current iLSCan be by after the rectification of rectification unit 784, being multiplied by Proportional coefficient K and obtaining.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 in PWM modulator, to produce driving
Signal.The drive signal includes the 3rd drive signal S3 and fourth drive signal S4, is respectively turned on the 3rd switching device Q3 and the
The base stage of four switching device Q4, the break-make of controlling switch device.
The present embodiment employs Double closed-loop of voltage and current, not Effect Mode handoff procedure, can improve inverter circuit
Control characteristic.
It should be noted that the present invention does not have strict limitation to the control mode of control assembly.In another embodiment,
First control assembly 77 can be controlled using voltage close loop control, the second control assembly 78 using voltage, current double closed-loop.Again
In one embodiment, the first control assembly 77 can be controlled using voltage, current double closed-loop, and the second control assembly 78 can be closed using voltage
Ring is controlled.
It is as shown in Figure 8 a 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 represents the moment corresponding pulse.The bridge arm of drive signal the 3rd still uses 50% dutycycle, and the 3rd bridge
The phase of arm is fixed, and the first control loop (also known as anode kV control loops) controls the first bridge arm 71 by first group of drive signal
Anode kV_and voltages are controlled with respect to the phase in-migration of the 3rd bridge arm, the second control loop (also known as negative electrode kV control loops) is by the
Two groups of drive signals control the dutycycles of the second bridge arm 72 to control negative electrode kV_cath voltages.
It is as shown in Figure 8 b the alternatively possible modulation waveform figure of the inverter of the embodiment of the present invention five, wherein abscissa
Expression time, ordinate represents the moment corresponding pulse.3rd bridge arm still use 50% dutycycle, and the 3rd bridge arm phase
Position is fixed, and the first control loop (also known as anode kV control loops) controls the duty of the first bridge arm 71 by first group of drive signal
Than controlling anode kV_and voltages, the second control loop (also known as negative electrode kV control loops) controlled by second group of drive signal
The phase in-migration control negative electrode kV_cath voltages of relative 3rd bridge arm of the second bridge arm 72.
The X-ray high-voltage generator for possessing anode and cathode balance of voltage ability proposed by the present invention, by controlling negative and positive respectively
Pole tension, even if in anode and cathode current imbalance, can still realize the balance of negative and positive pole tension.The present invention is whether in anode and cathode
In the case of using discrete high-tension transformer, or the situation of integrated high-tension transformer is being used to reduce volume
Under, can be when negative and positive electrode current has significant uneven, it is ensured that the balance of negative and positive pole tension, reduce high pressure generator pair
The requirement of negative and positive polar circuit uniformity, improves adaptability of the high pressure generator to 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 the embodiment of the above is intended merely to the explanation present invention, can also make in the case of without departing from spirit of the invention
Go out various equivalent change or replacement, therefore, as long as change, change in spirit of the invention to above-described embodiment
Type will all fall in the range of following claims.
Claims (10)
1. a kind of high pressure generator, it is characterised in that including：
Inverter, the inverter includes the first bridge arm, the second bridge arm and between first bridge arm and the second bridge arm
The 3rd bridge arm, first bridge arm, the second bridge arm include two switching devices respectively, and first bridge arm can be with the 3rd bridge
Arm constitutes anode inverter bridge, and second bridge arm can constitute negative electrode inverter bridge with the 3rd bridge arm, and the anode inverter bridge is adjusted
The anode voltage of the high pressure generator is saved, the negative electrode inverter bridge adjusts the cathode voltage of the high pressure generator；
The input of the first control assembly, the switching device for controlling the anode inverter bridge, and first control assembly
The anode of the high pressure generator is connected, the output end of first control assembly connects first bridge arm；
The input connection of the second control assembly, the switching device for controlling negative electrode inverter bridge, and second control assembly
The negative electrode of the high pressure generator, the output end of second control assembly connects second bridge arm.
2. high pressure generator according to claim 1, it is characterised in that first control assembly includes voltage regulator
And modulator, the voltage regulator is for obtaining anode collection voltages feedback signal and command value from the high pressure generator
Between difference, and according to the difference produce modulation voltage；The modulator, is connected, with the voltage regulator for connecing
The modulation voltage is received, and first group of drive signal is produced according to the modulation voltage, first group of drive signal is for driving
Move switch device conductive or the cut-off of first bridge arm；
Second control assembly includes voltage regulator and modulator, and the voltage regulator is used to obtain from the pressure high
Difference between the negative electrode collection voltages feedback signal and command value of raw device, and modulation voltage is produced according to the difference；It is described
Modulator, is connected with the voltage regulator, for receiving the modulation voltage, and produces second group according to the modulation voltage
Drive signal, second group of drive signal is used to drive switch device conductive or the cut-off of second bridge arm.
3. high pressure generator according to claim 1, it is characterised in that the 3rd bridge arm includes two switches of series connection
Device.
4. high pressure generator according to claim 1, it is characterised in that first electric capacity of the 3rd bridge arm comprising series connection
With the second electric capacity.
5. the high pressure generator according to claim 3 or 4, it is characterised in that the modulator include PWM modulator or
PFM modulators, to control first bridge arm, the second bridge arm the break-make of the switching device using PWM mode；
Or, the break-make of the switching device is controlled first bridge arm, the second bridge arm using PFM modulation systems.
6. high pressure generator according to claim 3, it is characterised in that first control assembly includes PFM modulators,
Second control assembly includes PWM modulator, and the PFM modulators connect first bridge arm and the 3rd bridge arm, institute simultaneously
State PWM modulator and connect second bridge arm, and rate of connections synchronous circuit between the PWM modulator and PFM modulators.
7. a kind of X-ray generator, including：High pressure generator and X-ray tube, the X-ray tube have negative electrode and anode,
The high pressure generator includes：
Inverter, the inverter includes the first bridge arm, the second bridge arm and between first bridge arm and the second bridge arm
The 3rd bridge arm, first bridge arm, the second bridge arm include two switching devices, and first bridge arm and the 3rd bridge arm respectively
Composition anode inverter bridge, second bridge arm constitutes negative electrode inverter bridge with the 3rd bridge arm, and the anode inverter bridge adjusts institute
The anode voltage of high pressure generator is stated, the cathode voltage control inverter bridge adjusts the cathode voltage of the high pressure generator, and
The anode voltage of the high pressure generator is applied to the anode of the X-ray tube, and the cathode voltage of the high pressure generator applies
In the negative electrode of the X-ray tube；
First control assembly, can connect with the anode inverter bridge composition control loop, and the input of first control assembly
The anode of the high pressure generator is connect, the output end of first control assembly connects first bridge arm；
Second control assembly, can connect with the negative electrode inverter bridge composition control loop, and the input of second control assembly
The negative electrode of the high pressure generator is connect, the output end of second control assembly connects second bridge arm.
8. a kind of control method of X-ray generator, the X-ray generator includes high pressure generator and X-ray tube,
The X-ray tube has negative electrode and anode, and the high pressure generator includes：
Inverter, the inverter includes the first bridge arm, the second bridge arm and between first bridge arm and the second bridge arm
The 3rd bridge arm, first bridge arm, the second bridge arm include two switching devices, and first bridge arm and the 3rd bridge arm respectively
Composition anode inverter bridge, second bridge arm constitutes negative electrode inverter bridge with the 3rd bridge arm, and the anode inverter bridge adjusts institute
The anode voltage of high pressure generator is stated, the negative electrode inverter bridge adjusts the cathode voltage of the high pressure generator；
The control method includes：
First voltage feedback signal is gathered from the anode of the high pressure generator, and is produced according to the first voltage feedback signal
First group of drive signal, first group of drive signal controls the anode inverter bridge so that the anode of the high pressure generator
Produce first voltage；And,
Second voltage feedback signal is gathered from the negative electrode of the high pressure generator, and is produced according to the second voltage feedback signal
Second group of drive signal, second group of drive signal controls the negative electrode inverter bridge so that the negative electrode of the high pressure generator
Second voltage is produced, 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 moon of the X-ray tube
Pole.
9. the control method of X-ray generator as claimed in claim 8, it is characterised in that also include：
The first current feedback signal is gathered from the anode inverter bridge, it is anti-according to first current feedback signal and first voltage
Feedback signal controls the anode inverter bridge；
The second current feedback signal is gathered from the negative electrode inverter bridge, it is anti-according to second current feedback signal and second voltage
Feedback signal controls the negative electrode inverter bridge.
10. the control method of X-ray generator as claimed in claim 8 or 9, it is characterised in that the 3rd bridge arm bag
Containing two switching devices, first group of drive signal controls first bridge arm, the 3rd bridge arm simultaneously using PFM regulative modes
The break-make of breaker in middle device, second group of drive signal controls the second bridge arm breaker in middle device using PWN regulative modes
Break-make, and the regulating frequency of first bridge arm, the second bridge arm and the 3rd bridge arm is identical.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107809178A (en) * | 2017-11-03 | 2018-03-16 | 上海联影医疗科技有限公司 | A kind of high pressure generator and its control method |
| CN110212773A (en) * | 2019-06-11 | 2019-09-06 | 上海联影医疗科技有限公司 | High pressure generator voltage-switching method, device, computer equipment and storage medium |
| CN110545611A (en) * | 2019-08-09 | 2019-12-06 | 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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