CN103891415B - X-ray high voltage device and method of operation thereof - Google Patents
X-ray high voltage device and method of operation thereof Download PDFInfo
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- CN103891415B CN103891415B CN201280051074.7A CN201280051074A CN103891415B CN 103891415 B CN103891415 B CN 103891415B CN 201280051074 A CN201280051074 A CN 201280051074A CN 103891415 B CN103891415 B CN 103891415B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
- H05G1/08—Electrical details
- H05G1/10—Power supply arrangements for feeding the X-ray tube
Abstract
The present invention provides the X-ray high voltage device that a kind of power loss that can reduce booster circuit and temperature rise.To this end, with predetermined repeat in timing synchronization the output voltage of booster circuit (20) is controlled such that the booster circuit action consistent with predetermined booster voltage during, during the booster circuit that makes the action of booster circuit (20) stop stops.Such as, during inverter circuit (30) is alternately carried out inverter circuit action and during inverter circuit stopping, during being synchronously set to booster circuit action during this inverter circuit action, during being synchronously set to booster circuit stopping with inverter circuit during stopping.
Description
Technical field
The present invention relates to a kind of X-ray high voltage device, particularly to one when such as pulse perspective when long
Between can reduce power loss when supplying tube current off and on and X-ray high voltage device that temperature rises.
Background technology
X-ray imaging device and X ray CT device use a kind of X-ray high voltage device, and it supplies direct current to X-ray tube
Tube voltage/tube current, and control tube voltage/tube current.
X-ray high voltage device of the prior art the most as described in Patent Document 1 as, made by booster circuit
The source power supply of exchange is carried out the DC voltage that rectifier obtains boost, be converted into high frequency by inverter circuit
Alternating voltage.After the output voltage of inverter circuit being carried out transformation by high voltage transformer, by high voltage rectifier electricity
Road carries out rectification to be supplied to X-ray tube.Detection is applied to the voltage (tube voltage) of X-ray tube, carries out inverter circuit instead
Feedback controls to make tube voltage consistent with the tube voltage of target.It addition, detect the DC voltage after being boosted by booster circuit,
Booster circuit is carried out feedback control and makes consistent with the DC voltage of target.
Along with the high frequency of the operating frequency of inverter circuit in recent years, at intermittent irradiation X the most continuously for a long time
During the pulse perspective of ray, the temperature of device rises.Therefore, Patent Document 1 discloses following method of operating, i.e. replace
Ground repeat that inverter circuit is carried out the period of feedback control and do not carry out feedback control and become at tube voltage be not 0 minimum
During the operating point of value makes the nonfeedback control of its action.Accordingly, for the X-ray high voltage device of patent documentation 1, averagely come
See that voltage that inverter exports and the long-pending of time were greatly reduced than in the past.In addition it is possible to the switch reducing inverter circuit damages
Become estranged the loss of high voltage transformer.Rise thereby, it is possible to reduce temperature.
Prior art literature
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2000-58291 publication
Summary of the invention
The problem that invention is to be solved
In the technology described in above-mentioned patent documentation 1, it is possible to reduce along with inverter circuit and high voltage transformer
The heating of power loss, but not in view of switch element and the loss of inductance reducing booster circuit.
It is an object of the invention to: the X-ray that a kind of power loss that can reduce booster circuit and temperature rise is provided
High voltage device.
The scheme of solution problem
In order to achieve the above object, according to the present invention, it is provided that following X-ray high voltage device.That is, possess from electricity
Booster circuit that the voltage in source carries out boosting, the inverter electricity of the alternating voltage that the output voltage of booster circuit is converted to high frequency
Road, output voltage to inverter circuit boost and are supplied to the high voltage transformation/rectification part of X-ray tube, control after rectification
The boost action control circuit of booster circuit processed, in this X-ray high voltage device, boost action control circuit was determined with predetermined
Time synchronously repeat the output voltage of booster circuit is controlled such that the booster circuit consistent with predetermined booster voltage moves
During stopping with the booster circuit making the action of booster circuit stop during work.
Invention effect
In accordance with the invention it is possible to reduce inductance and the loss of switch element of booster circuit, therefore, it is possible to institute is lost in suppression
Adjoint temperature rises, it is possible to prevent the large-scale of chiller.Thereby, it is possible to seek the simple of X-ray high voltage device
Change and miniaturization.
Accompanying drawing explanation
Fig. 1 is the block diagram of the X-ray high voltage device of the first embodiment.
Fig. 2 is the circuit diagram of the structure of the booster circuit representing the first embodiment.
Fig. 3 is the circuit diagram of the structure of the inverter circuit representing the first embodiment.
Fig. 4 is the explanatory diagram of the waveform of the control signal etc. of the X-ray high voltage device representing the first embodiment.
Fig. 5 is the flow chart of the action of the boost action control circuit representing the first embodiment.
Fig. 6 is the flow chart of the action of the tube voltage control circuit representing the first embodiment.
Fig. 7 is the block diagram of the X-ray high voltage device of the second embodiment.
Fig. 8 is the explanatory diagram of the waveform of the control signal etc. of the X-ray high voltage device representing the second embodiment.
Fig. 9 is the explanatory diagram of the waveform of the control signal etc. of the X-ray high voltage device representing the 3rd embodiment.
Figure 10 is the block diagram of the X-ray high voltage device of the 4th embodiment.
Figure 11 is the circuit diagram of the structure of the booster circuit representing the 4th embodiment.
Figure 12 is the explanatory diagram of the waveform of the control signal etc. of the X-ray high voltage device representing the 4th embodiment.
Detailed description of the invention
In the present invention, being a kind of X-ray high voltage device, it possesses the boosting boosting the voltage from power supply
Circuit, the output voltage of above-mentioned booster circuit is converted to the alternating voltage of high frequency inverter circuit, to above-mentioned inverter electricity
The output voltage on road is supplied to the high voltage transformation/rectification part of X-ray tube, controls the liter of booster circuit after carrying out boosting and rectification
Pressure control circuit, in this X-ray high voltage device, be configured to boost action control circuit with predetermined in timing synchronization
Repeat the output voltage of above-mentioned booster circuit is controlled such that the booster circuit action phase consistent with predetermined booster voltage
Between and during making the booster circuit stopping that the action of above-mentioned booster circuit stops.
At this moment, the tube voltage control circuit being configured to control inverter circuit controls inverter circuit, with predetermined
During repeating to export predetermined output voltage the inverter circuit action of above-mentioned high voltage transformation/rectification part in timing synchronization
During stopping with the inverter circuit making the action of inverter circuit stop.In such a case it is possible to be configured to boost action control
During being synchronously set to booster circuit action during circuit processed and inverter circuit action, Tong Bu during stopping with inverter circuit
During ground is set to booster circuit stopping.
Size with the supply voltage being supplied to booster circuit can also be more than predetermined value by boost action control circuit
Period synchronize period be set to booster circuit action during, period less than predetermined value for the size of supply voltage is set to boosting
During the stopping of circuit.
It addition, the size with the supply voltage being supplied to booster circuit can also be predetermined value by boost action control circuit
During the period that period overlapping during above period and inverter circuit action synchronizes is set to booster circuit action, will supply
The period less than predetermined value to the size of supply voltage of booster circuit or inverter circuit are set to booster circuit during stopping and stopping
Only period.
The cycle synchronisation of tube voltage control circuit and the intermittent irradiation of the X-ray from X-ray tube, weight can also be configured to
During multiple inverter circuit action and during inverter circuit stopping.
The multiple booster circuit of parallel configuration can also be configured to, in this case, be configured to boost action control circuit example
During being set to booster circuit action, select multiple booster circuit the most in order according to predetermined timing, to select
The output voltage of booster circuit is controlled such that consistent with predetermined booster voltage, makes this liter of piezoelectricity in nonoptional period
The action on road stops.
Following description embodiments of the present invention.
<the first embodiment>
X-ray high voltage device according to explanation the first embodiments such as Fig. 1.Fig. 1 is that the X-ray of the first embodiment is high
The block diagram of voltage device.Fig. 2 is the circuit diagram of booster circuit.
As shown in Figure 1, X-ray high voltage device possess to use power supply carry out rectification rectification circuit 10, to rectification after
Voltage carry out boosting booster circuit 20, the DC voltage after boosting is converted to high frequency the inverter circuit of alternating voltage
30, the high voltage transformer 40 output voltage of inverter circuit 30 boosted, the output voltage to high voltage transformer
Carry out rectification high voltage rectifier circuit 50, apply as high voltage rectifier circuit 50 output voltage direct current high voltage and
The X-ray tube 60 of injection X-ray and control portion 70.X-ray tube 60 possesses the anode rotation carrying out anode rotating driving and drives
Galvanic electricity road 61.Anode rotates drive circuit 61 and is connected in parallel with inverter circuit 30.
Control portion 70 includes tube voltage testing circuit 71, tube voltage control circuit 72, DC voltage testing circuit 73, boosting
Control circuit 74 and circuit for generating synchronous signals (Synchronization Control portion) 75.
Tube voltage testing circuit 71 detection is applied to the voltage (tube voltage) of X-ray tube.Tube voltage control circuit 72 is to inverse
Become device circuit 30 and carry out tube voltage and the tube voltage one of target that feedback control makes to be detected by tube voltage testing circuit 71
Cause.DC voltage testing circuit 73 detects the DC voltage after being boosted by booster circuit 20.Boost action control circuit
74 pairs of booster circuits 20 carry out DC voltage and the target that feedback control makes to be detected by DC voltage testing circuit 73
DC voltage is consistent.Circuit for generating synchronous signals 75 is received and dispatched to tube voltage control circuit 72 and boost action control circuit 74 and is synchronized
Signal so that according to predetermined action in timing synchronization.
Then, Fig. 2 is used to describe the major part i.e. booster circuit 20 of the present invention in detail.Booster circuit 20 is from input
(A, B) accept by rectification circuit 10, source power supply is carried out the commutating voltage that rectifier obtains, after boosting from outfan (C,
D) output.Booster circuit 20 is configured to possess inductance (L1) 21, switch element 22, diode (D1) 24 and capacitor (Cd)
23.As switch element 22, such as, use and diode 22b is switched (S1) 22a with insulated gate bipolar transistor (IGBT) etc.
The switch element of anti-parallel connection gained.
Boost action control circuit 74 is by carrying out pulse width modulation control to switch (S1) 22a, and is put aside by electric charge
Boost in capacitor (Cd) 23.Thus, the liter that feedback control makes to be detected is carried out by DC voltage testing circuit 73
The output voltage of volt circuit 20 is consistent with set DC voltage desired value.
On the other hand, inverter circuit 30 is that 4 switch elements 31～34 couple together the full-bridge of gained as shown in Figure 3
Circuit.Switch element 31～34 is the electricity that diode D11～D14 and IGBT etc. switchs S11～S14 reverse connection gained respectively
Road.By the switch element 31 being connected in series and the midpoint a of switch element 32, the switch element 33 being connected in series and switch element 34
Midpoint b be connected with high voltage transformer 40 as output point.
Switch S11～S14 of the switch element 31～34 of inverter circuit 30 is connected with tube voltage control circuit 72 respectively.
Tube voltage control circuit 72 is by carrying out switch S11～S14 respectively according to according to the predetermined timing sequence of imaging conditions
On-off control, and the tube voltage of X-ray tube 60 is controlled such that consistent with the tube voltage set according to imaging conditions.On one side
Carrying out such control, tube voltage control circuit 72 is controlled so that detected by tube voltage testing circuit 71
Tube voltage bigger than set tube voltage in the case of, reduce the duty of the switch of switch S11～S14 of inverter circuit 30
Ratio.
On the contrary, it is controlled such that at the tube voltage detected by tube voltage testing circuit 71 than set tube voltage
In the case of little, improve the dutycycle of the switch of switch S11～S14 of inverter circuit 30.Specifically, by PWM control
I.e. change switch S11 with S14, switch S13 with S12 is the length during connecting the most simultaneously, adjusts and applies to X-ray tube 60
Voltage.Thus, tube voltage control circuit 72 carries out feedback control and makes the tube voltage of X-ray tube 60 and set tube voltage
Unanimously.
It addition, tube voltage control circuit 72 is by stopping with inverter circuit during alternately repeating inverter circuit action
Period, and reduce the long-pending of inverter output voltage and time compared with the situation often carrying out feedback control, and increase switch
The switching losses averagely reducing inverter circuit 30 in cycle and the loss of high voltage transformer 40, reduce temperature and rise.
Use Fig. 4, Fig. 5 and Fig. 6 illustrate the action of the X-ray high voltage device of present embodiment.
Fig. 4 (a)～(f) are the explanatory diagrams of the signal waveform representing the control signal in control portion 70 and output signal.Fig. 5 is
Represent the flow chart of the action of boost action control circuit 74.Fig. 6 is the flow chart of the action representing tube voltage control circuit 72.
In the present embodiment, during making inverter circuit 30 be alternately carried out inverter circuit action with the predetermined cycle
During stopping with inverter circuit.And then so that make the liter of booster circuit 20 press accordingly during stopping with inverter circuit
Work stops, the middle feedback control action performing boosting during inverter circuit action.Thus, the electric power of booster circuit 20 is reduced
Loss, reduces the heating of booster circuit.
First, the rectification circuit 10 alternating voltage to obtaining from source power supply carries out rectification and becomes DC voltage, is supplied to
Booster circuit 20.Booster circuit 20 is by being entered the timing making switch (S1) 22a switch by boost action control circuit 74
Horizontal pulse width modulated controls, and is put aside by electric charge in capacitor (Cd) 23, the unidirectional current to the two ends of capacitor (Cd) 23
Pressure Vo1 boosts.
At this moment, circuit for generating synchronous signals 75 generates the synchronizing signal of switching switch as Fig. 4 (a) with predetermined timing
And export.That is, circuit for generating synchronous signals 75 accepts the X-ray intermittent irradiation of X-ray tube 60 from the operating portion 80 connected
The setting in cycle (such as carrying out frame rate during pulse perspective by X-ray imaging device), with set cycle (frame speed
Rate) the corresponding synchronizing signal generating switching switch.
Specifically, such as can select frame rate in operating portion 80 is 7.5fps(fps: frame/second), 15fps,
In the case of 30fps, generate the synchronizing signal of cycle T=133ms, 67ms, 33ms respectively.The dutycycle (=connection of synchronizing signal
Time Ton/ cycle T) it is value set in advance or value that the thickness with detected body is set accordingly by operator.It addition, root
The pixel value of the image obtained according to the thickness of detected body changes, and therefore can also be set can be obtained by feedback control
The dutycycle of desired pixel value.
The synchronizing signal that circuit for generating synchronous signals 75 is generated is as shown in Figure 1 by boost action control circuit 74 and pipe electricity
Pressure control circuit 72 is received and dispatched simultaneously.Boost action control circuit 74 and tube voltage control circuit 72 are with synchronizing signal synchronously
Carry out following action.
Boost action control circuit 74 is as the flow process of Fig. 5, and the timing opened according to synchronizing signal starts booster circuit
The control (during potential circuit action) of the boost action of 20, to synchronizing signal for persistently carrying out boost action (step closing
Rapid 501～504).It is the period opened in synchronizing signal, proceeds to step 505, be taken into boosting from DC voltage testing circuit 73
The voltage Vo1 of the capacitor (Cd) 23 of circuit 20, compares (step 505) by itself and set DC voltage desired value.
In the case of the voltage Vo1 of capacitor (Cd) 23 is less than desired value, generate a liter piezoelectricity as shown in Figure 4 (b)
Road control signal, makes switch (S1) 22a switch according to this signal.Thus, the boost action making booster circuit 20 is open-minded.
While it being carried out feedback control while continuing (during booster circuit action) (step 506,507) until capacitor (Cd) 23
Till voltage Vo1 reaches desired value.
By this control, the voltage Vo1 of capacitor (Cd) 23 is the timing opened as Fig. 4 (c) according to synchronizing signal
Begin to ramp up, rise till reaching desired value, becoming closedown to synchronizing signal, maintain desired value.Become in synchronizing signal
In the case of closing, switch (S1) 22a becomes closedown in step 502, and the action therefore boosted stops (booster circuit stopping
Period).
Thus, the voltage Vo1 of capacitor (Cd) 23 is gradually lowered and is equivalent to inverter circuit 30 and anode rotation driving electricity
The amount of electric power necessary to the action on road 61.But, inverter circuit 30 becomes inversion when synchronizing signal is and closes
During device circuit stops, consuming electric power the most hardly, and be to consume the only anode of electric power the period closed in synchronizing signal
Rotate drive circuit 61.Thus, the DC voltage Vo1 of capacitor (Cd) 23 is the most small in the period that synchronizing signal is closed
Ground slowly reduces.
DC voltage after inverter circuit 30 will be boosted by booster circuit 20 is converted to the alternating voltage of high frequency.At this moment,
During tube voltage control circuit 72 and synchronizing signal synchronously switch inverter circuit action and during inverter circuit stopping.
That is, as shown in the flow process of Fig. 6, tube voltage control circuit 72, in the case of synchronizing signal is for opening, has been described above
Inverter circuit action during action (step 601,602), in the case of synchronizing signal is for closing, carry out inverter electricity
Action (step 603) during the stopping of road.
Thus, as Fig. 4 (d), during the action of inverter circuit, switch S1～S4 is carried out on-off control, adjusts
The output voltage of inversion device circuit 30, makes tube voltage and desired value one that tube voltage testing circuit 71 detects as Fig. 4 (e)
Cause.Thus, tube current is also consistent with set desired value as Fig. 4 (f).During inverter circuit stops, switching S1
～S4 all becomes closedown, tube voltage and tube current are set to 0.
The high frequency voltage that inverter circuit 30 is exported by high voltage transformer 40 boosts, by high voltage rectifier circuit 50
It is supplied to X-ray tube 60 as DC voltage (tube voltage), DC current (tube current) after carrying out rectification.
Thus, synchronously supply tube voltage and tube current to X-ray tube 60 with synchronizing signal, according to Tong Bu with synchronizing signal
The X-ray of timing reirradiation pulse type.Anode rotate drive circuit 61 unrelated with the switch of synchronizing signal and continuously to X
The anode of ray tube 60 carries out rotating driving.
So, according to the X-ray high voltage device of present embodiment, penetrate with irradiating X off and on as pulse perspective etc.
Synchronously, during the inverter circuit of the tube voltage of not X-ray irradiation stops, booster circuit 20 is by boost action for the situation of line
It is set to close (during booster circuit stops).
Thus, during the inverter circuit of tube voltage stops (during synchronizing signal is closed), booster circuit 20 is not carried out
The palikinesia of the switch of switch (S1) 22a, therefore, it is possible to reduce switching losses.And then, the inductance 21 of booster circuit 20 is inverse
Become device circuit stop during (synchronizing signal down periods) do not carry out switching the switch of (S1) 22a, therefore, it is possible to reduce inductance 21
Loss.
Additionally, in Fig. 4 (c), represent the change of the DC voltage Vo1 of the capacitor (Cd) 23 of booster circuit 20 enlargedly
Change, but compared with the cycle T of synchronizing signal, the discharge time constant of capacitor (Cd) 23 is very big, and therefore booster circuit stops
The reduction of the DC voltage Vo1 of the capacitor (Cd) 23 of period is the least.Hereinafter, this feelings are represented by concrete calculating
Condition.
It is 125kV setting the frame rate of pulse perspective as 30fps, tube voltage, sets tube current (meansigma methods) ImA(mean)
In the case of=4mA, obtain tube current ImA during radiation pulses X-ray according to following formula (1).
ImA=(T/Ton) × ImA(mean) ... (1)
Here, cycle when T is frame rate 30fps, T=33ms.TonIt is the pulsed X-ray irradiation time in 1 cycle T,
This, it is assumed that Ton=4ms。
According to formula (1), ImA=33mA under these conditions.Booster circuit 20 is (synchronizing signal is opened) when X-ray irradiation
Need to supply the electric power of 125kV × 33mA=4125W.In addition, it is necessary to often rotate drive circuit 61 to anode to supply anode rotation
Required electric power 100～about 500W.Therefore, booster circuit 20 (synchronizing signal is open-minded) when X-ray irradiation needs supply
4125W+500W(is maximum) electric power of=4625W, when X-ray stops (synchronizing signal closedowns) need supply 500W(maximum)
Electric power.
That is, the load of booster circuit 20 synchronously changes with pulse perspective.With RL=(Vo1 × Vo1)/P such formula table
Show the value of load resistance.Vo1 be by booster circuit 20 boost after DC voltage, at this if set to Vo1=600V then RL such as
Under.
During RL(X-ray irradiation)=600 × 600/4625=87.3 Ω
When RL(X ray stops)=600 × 600/500=720 Ω
The capacity of booster circuit 20 capacitor (Cd) 23 is several about mF, such as if set to 5mF, then capacitor (Cd)
Discharge time constant τ of 23 is as follows.
τon(during X-ray irradiation)=87.3 Ω × 5mF=0.44s
τoff(when X-ray stops)=720 Ω × 5mF=3.6s
According to this calculating, it is known that discharge time constant τ of the capacitor (Cd) 23 when X-ray stopsoff=3.6s compares pulse
The cycle (maximum hundreds of ms) of perspective is much larger.Therefore, (the inverter circuit withholding period that synchronizing signal is closed when X-ray stops
Between), even if making the boost action of booster circuit 20 for closing, the reduction of the DC voltage of capacitor (Cd) 23 is the least.
Thus, when X-ray stops, (when synchronizing signal is closed), even if stopping booster circuit 20, DC voltage is the most significantly
Reduce, therefore when again switching to X-ray irradiation time (synchronizing signal is open-minded), will not in order to boost and switch element 22,
Inductance 21 flows super-high-current, does not produce the loss that the stopping of booster circuit 20 is adjoint.Thus, by when X-ray stops
Stop booster circuit 20, it is possible to obtain the effect that the loss of inductance and switch element reduces.
In the present embodiment, during stopping with inverter circuit, the boost action of booster circuit 20 is synchronously made to stop,
It is possible to not add the elements such as new switch and just reduce loss and the switching losses of inductance 21.Thus, do not produce because of new unit
The additional new thermal source caused of part, it is possible to seek to reduce loss.
X-ray high voltage device real-world operation is made to measure its temperature and rise under conditions of being represented by above-mentioned calculating
Time, rise about 60 DEG C relative to temperature in existing X-ray high voltage device, to this, in the device of present embodiment,
Can suppress be about 30 DEG C temperature rise.Thereby, it is possible to the cooling dress such as the cooling fan that device is possessed and fin
The number put reduces 2～3, seeks the simplification/miniaturization of apparatus structure.It addition, the electric power of cooling fan can be cut down, and then
Low electrification can be sought.
It addition, by synchronously making booster circuit 20 stop during stopping with inverter circuit, additionally it is possible to obtain X-ray high
The effect that the interference (noise) of voltage device reduces.
Additionally, in the first embodiment, during making to be set to boost action the timing opened and inverter circuit action
Become the timing opened consistent but it also may be configured to only in the predetermined time, boost action be set to ahead of time the timing opened.
Thus, boost action than starting Zao during inverter circuit action, therefore during inverter circuit action for opening time energy
Enough by the boost in voltage of capacitor (Cd) 23 to predetermined target voltage, it is possible to fully carry out voltage to inverter circuit 30
Supply.
<the second embodiment>
Use Fig. 7, Fig. 8 that the embodiment 2 of the second embodiment is described.Fig. 7 is the X-ray height electricity representing the second embodiment
The block diagram of the structure of pressure device.Fig. 8 (a)～(d) are the explanatory diagrams of the signal waveform in each portion representing X-ray high voltage device.
As it is shown in fig. 7, different from the first embodiment in this second embodiment, do not make tube voltage control circuit 72 and rise
Pressure control circuit 74 synchronizes, and make the supply voltage of the boost action of boost action control circuit 74 and source power supply with
Step.Specifically, as shown in Figure 7, replace the circuit for generating synchronous signals 75 of the first embodiment and configure commercial voltage detecting/
Circuit for generating synchronous signals 175.Commercial voltage detecting/circuit for generating synchronous signals 175 is taken into the voltage of source power supply, generates same
It is input to boost action control circuit 74 after step signal.The boost action control circuit 74 voltage after rectification become predetermined value with
On period carry out boost action (during booster circuit action).
Use the action of the X-ray high voltage device of the signal waveform explanatory diagram 7 of Fig. 8 (a)～(d).Source power supply is false
It is set to single-phase.Commercial voltage detecting/circuit for generating synchronous signals 175 detects the voltage of source power supply, at the voltage (figure detected
When 8(a)) being more than threshold value Vref1 or below Vref2, control boost action control circuit 74 and make booster circuit 20 action.
Thus, boost action control circuit 74 is according to the detection voltage switch element to booster circuit 20 of DC voltage testing circuit 73
22 carry out feedback control (Fig. 8 (c)).Thus, the voltage (Fig. 8 (b)) after the rectification of rectification circuit 10 is more than threshold value Vref1
Period carry out boost action, therefore, it is possible to boost when the voltage supplied to booster circuit 20 is high, it is possible to high
Effect ground boosts.
On the other hand, the voltage detected by commercial voltage detecting/circuit for generating synchronous signals 175 be below Vref1,
The period of more than Vref2, boost action control circuit 74 stops boost action (during booster circuit stops).
Thus, from booster circuit 20 output DC voltage (Fig. 8 (d)) repeat with the first embodiment in the same manner as boost and
The small voltage caused because of electric discharge reduces.In the case of stopping booster circuit 20 accordingly with power cycle, stopping of boosting
Only period as knowable to according to figure (a)～(d), be less than the half of 1 cycle 20ms when supply frequency is 50Hz once,
Less than less than half of 1 cycle 16ms during 60Hz, with the capacitor (Cd) 23 obtained by calculating in the first embodiment
Discharge time constant τoff=3.66s compares the least.Thus, even if stopping booster circuit 20 during booster circuit stops,
The DC voltage of booster circuit 20 is not greatly reduced, therefore when again switching to boost action to open, at switch element
22, inductance 21 does not flows through big electric current, do not produce the loss that the stopping of booster circuit 20 is adjoint.
On the other hand, tube voltage control circuit 72 is asynchronous with boost action control circuit 74, and with operating portion 80 institute
The cycle that the frame rate of setting is corresponding repeats during inverter circuit action and during inverter circuit stopping.
Other structures are identical with the first embodiment, therefore omit the description.
As described above, in this second embodiment, according to the timing of the voltage applying more than threshold value from rectification circuit 10,
Boost action is set to by booster circuit 20 open (during booster circuit action), is set to boost action in addition close
(during booster circuit stops), it is possible to boost efficiently, and by repeating the switch of boost action, it is possible to
Reduce loss and the switching losses of switch element 22 of the inductance 21 of booster circuit.Thereby, it is possible to reduce the heating of device, energy
Enough carry out the simplification of cooling body, the miniaturization of X-ray high voltage device.It addition, X-ray high voltage device can be reduced
Interference (noise).
In this second embodiment, it is configured to be detected source power supply by commercial voltage detecting/circuit for generating synchronous signals 175
Voltage, but can certainly be configured to detect the voltage after rectification by rectification circuit 10.
<the 3rd embodiment>
In the third embodiment, the first embodiment and the second embodiment are combined, in the cycle synchronisation with frame rate
Inverter circuit action during, and with the DC voltage of rectification circuit 10 as threshold value more than timing make booster circuit 20 move
Make.
As shown in Fig. 9 (a)～(c), in the structure of the second embodiment, with the DC voltage of rectification circuit 10 as threshold value
During the timing of more than Vref1 starts booster circuit action.As Fig. 9 (d), it is configured to the structure at the first embodiment
In the cycle Tong Bu with frame rate alternately repeat inverter circuit action during and inverter circuit stop during, will be with inversion
During the period synchronized during device circuit operation is set to booster circuit action.In the third embodiment, it is combined, presses
According to the timing that DC voltage is more than threshold value Vref1 of rectification circuit 10, and using the phase during inverter circuit action
Between be set to booster circuit action during.Such as, it is 60Hz at supply voltage, in the case of frame rate is 30fps, according to Fig. 9 (e)
Boost action is set to open-minded by shown timing.
Thereby, it is possible to boost efficiently when DC voltage is more than threshold value, and can shorten and will rise
Press the time making to be set to open, therefore, it is possible to reduce the switching losses of the switch element of booster circuit 20, additionally it is possible to reduce electricity
The loss of sense 21.
In the present embodiment, booster circuit 20 be the period (booster circuit stop during) closed be than inverter circuit
Period slightly long during stopping, but as explanation in the first embodiment, the discharge time constant of capacitor (Cd) 23
τoffThan inverter circuit stop during long a lot, therefore booster circuit 20 be closedown period DC voltage drop hardly
Low (Fig. 9 (f)).Thus, when boost action again switches to and opens, in switch element 22, inductance 21, big electricity is not flowed through
Stream, does not produce the loss that the stopping of booster circuit 20 is adjoint.Thus, by stopping booster circuit 20, energy when X-ray stops
Access the effect of the loss reducing inductance and switch element.
<the 4th embodiment>
Use Figure 10～Figure 12 that the X-ray high voltage device of the 4th embodiment is described.
The X-ray high voltage device of the 4th embodiment is not to be merely able to carry out the X that Continuous irradiation is more weak in a pulsed manner
The pulse perspective of ray, additionally it is possible to carry out the device of the photography of the X-ray of the big tube current/tube voltage of once irradiating.Device
Overall structure is as shown in Figure 10, identical with the second embodiment, but the circuit structure of the inside of booster circuit 20 and boosting
The action of control circuit 74 is different from the second embodiment.
As shown in figure 11, booster circuit 20 possesses 3 inductance 21-1,21-2,21-3；3 switch 22a-1,22a-2,
22a-3；3 diodes 22b-1,22b-2,22b-3 and 3 diodes 24-1,24-2,24-3, constitute 3 boostings in parallel
Circuit 20-1,20-2,20-3.That is, the first booster circuit 20-1 is by inductance 21-1, switch 22a-1, diode 22b-1 and two
Pole pipe 24-1 is constituted.
Second booster circuit 20-2 is made up of inductance 21-2, switch 22a-2, diode 22b-2 and diode 24-2.The
Three booster circuit 20-3 are made up of inductance 21-3, switch 22a-3, diode 22b-3 and diode 24-3.First～the 3rd liter
Volt circuit 20-1,20-2,20-3 are by making 3 switches 22a-1,22a-2,22a-3 simultaneously repeat switch, it is possible to by electricity
Lotus is put aside in a capacitor (Cd) 23.Thus, the pulse perspective illustrated in this second embodiment it is more than, additionally it is possible to
Carry out the photography of the X-ray of the big tube current/tube voltage of once irradiating.Rectification circuit 10, inverter circuit 30, high voltage transformation
The structure of device 40, high voltage rectifier circuit 50 and X-ray tube 60 is identical with the first embodiment.
In boost action control circuit 74, as DC voltage desired value set pulse perspective time desired value and take the photograph
2 desired values of desired value during shadow.Boost action control circuit 74 makes 3 switches 22a-1,22a-2,22a-3 when photography
Repeatedly switch simultaneously, make capacitor (Cd) 23 boost to the voltage of desired value when photographing.Such as, carry out switch to make
The electric current of each 100A is respectively flowed through, by adding up to the electric current of 300A to make capacitor (Cd) 23 boost in 3 booster circuits.
On the other hand, when pulse perspective, commercial voltage detecting/circuit for generating synchronous signals 175 detects source power supply
Voltage cycle (Figure 12 (a)), produces the synchronizing signal in each predetermined cycle (such as 2 cycles).Receive this synchronization
3 in every 2 cycles of power cycle, are risen as Figure 12 (b)～(d) by the boost action control circuit 74 of signal in order
Its action is made during volt circuit 20-1,20-2,20-3 are set to booster circuit action.
That is, during the first booster circuit 20-1 being set to booster circuit action, switch 22a-1 is made to repeat switch, example
Such as the electric current of the 30A to capacitor (Cd) 23 2 cycles of supply, capacitor (Cd) 23 is made to boost.At this moment, second and the 3rd boost
Switch 22a-2,22a-3 of circuit 20-2,20-3 becomes closedown (during booster circuit stops).
In next 2 cycles, during the second booster circuit 20-2 is set to booster circuit action, make switch 22a-2
Repeat switch, such as to the electric current of 30A in capacitor (Cd) 23 2 cycles of supply, first and the 3rd booster circuit 20-1,
20-3 becomes closedown (during booster circuit stops).And then, in next 2 cycles, the 3rd booster circuit 20-3 is set to
During booster circuit action, make switch 22a-3 repeat switch, such as, supply the electricity of the 30A in 2 cycles to capacitor (Cd)
Stream, first and second booster circuit 20-1,20-2 become closedown (during booster circuit stops).
So, during selecting 3 booster circuits 20-1,20-2,20-3 to be set to booster circuit action seriatim, and
The boost in voltage of capacitor (Cd) 23 is made as Figure 12 (e).Additionally, in Figure 12 (b)～(d), in order to easily illustrate,
By the waveform tracing that control signal is the period opened to switch 22a-1～22a～3 for the most open-minded, but as described above,
In this period opened, control signal repeatedly switchs.
So, by making 3 booster circuit actions in order when pulse perspective, (10A such as every time) makes 3 with simultaneously
The situation of booster circuit action and voltage required for boosting to pulse perspective is compared, the voltage of boosting in capacitor (Cd) 23
Identical, but be 2 booster circuits all the time for closing, therefore, it is possible to reduce the loss of the inductance 22 of the booster circuit becoming closedown.
In the booster circuit making its action, with make 3 booster circuit actions at the same time in the case of electric current (such as 10A) phase that flows through
Ratio, flows through the electric current (30A) of 3 times, and the loss that therefore cannot obtain switch element 22 reduces and the effect losing reduction of inductance 21
Really, but the biggest reason of the heating of booster circuit 20 is the loss of inductance 22, therefore in the basis of the loss that can reduce inductance 22
In embodiment, the effect reducing heating is bigger.
Additionally, tube voltage control circuit 72 repeats inversion with the cycle synchronisation of frame rate in the same manner as the second embodiment
During device circuit stops and during inverter circuit action.
So, in the 4th embodiment, at the booster circuit 20 using the structure being connected in parallel multiple booster circuit
X-ray high voltage device in, during multiple booster circuits are set to booster circuit action in order, it is possible to be reduced
The effect of loss.
Alternatively, it is also possible to combination the 4th embodiment and the first embodiment.Specifically, it is also possible to even being configured to
Multiple booster circuits are in the booster circuit during booster circuit action, at the inverter circuit of tube voltage control circuit 72
Also stop boost action during stopping, only during inverter circuit action, carry out boost action.
Alternatively, it is also possible to combination the 4th embodiment and the second embodiment.Specifically, it is also possible to even being configured to
Being in the booster circuit during booster circuit action in multiple booster circuits, the supply voltage after rectification is than predetermined voltage
Period little for Vref1 also stops boost action, only boost action is set to out in the period becoming predetermined more than voltage Vref1
Logical.
Additionally, above-mentioned first～the 4th in embodiment, when illustrating the pulse perspective of X-ray high voltage device, but
The voltage of capacitor (Cd) 23 reduces the most hardly when boost action being set to and closing, and also therefore is able to have an X-rayed continuously.
It addition, synchronously boost action is set to the second embodiment and the liter of the 4th embodiment opened with the change of supply voltage
Volt circuit is not limited to X-ray high voltage device, also is able to obtain in the case of the booster circuit as other devices uses
Reduce the effect of loss.
As described above, in accordance with the invention it is possible to reduce the switch element of booster circuit, the loss of inductance, because of
This can suppress to lose adjoint temperature and rise, it is possible to prevent the large-scale of chiller (fin, cooling fan etc.),
Seek simplification and the miniaturization of device.
In addition it is possible to the cost of restraining device.And then, it is possible to carry out the high frequency of the operating frequency of booster circuit.
Description of reference numerals
10: rectification circuit；20: booster circuit；21: inductance；22: switch element；22a: switch；22b: diode；23: electricity
Container；30: inverter circuit；31～34: switch element；40: high voltage transformer；50: high voltage rectifier circuit；60:X ray
Pipe；61: anode rotates drive circuit；70: control portion；71: tube voltage testing circuit；72: tube voltage control circuit；73: direct current
Voltage detecting circuit；74: boost action control circuit；75: circuit for generating synchronous signals；80: operating portion；175: commercial voltage inspection
Survey/circuit for generating synchronous signals.
Claims (8)
1. an X-ray high voltage device, it is characterised in that possess:
The booster circuit that voltage from power supply is boosted；
The output voltage of above-mentioned booster circuit is converted to the inverter circuit of the alternating voltage of high frequency；
The output voltage of above-mentioned inverter circuit is boosted and after rectification, is supplied to the high voltage transformation/rectification of X-ray tube
Portion；And
Control the boost action control circuit of above-mentioned booster circuit, wherein
The output voltage of above-mentioned booster circuit is controlled by above-mentioned boost action control circuit with predetermined repetition in timing synchronization
The liter piezoelectricity make during making the booster circuit action consistent with predetermined booster voltage, making the action of above-mentioned booster circuit stop
During road stops；
The multiple above-mentioned booster circuit of parallel configuration,
Above-mentioned boost action control circuit, during being set to above-mentioned booster circuit action, controls alternatively to press according to predetermined timing
Multiple above-mentioned booster circuits are selected by order so that the output voltage of the booster circuit selected and predetermined booster voltage
Unanimously, the action of this booster circuit is made to stop in nonoptional period, during being set to the stopping of above-mentioned booster circuit.
X-ray high voltage device the most according to claim 1, it is characterised in that
It is also equipped with controlling the tube voltage control circuit of above-mentioned inverter circuit,
Above-mentioned tube voltage control circuit controls above-mentioned inverter circuit, predetermined repeats predetermined defeated in timing synchronization with above-mentioned
During going out the inverter circuit action that voltage exports above-mentioned high voltage transformation/rectification part, make the action of above-mentioned inverter circuit
During the inverter circuit stopped stops,
The period Tong Bu with during this inverter circuit action is set to above-mentioned booster circuit and moves by above-mentioned boost action control circuit
During work, during during stopping with above-mentioned inverter circuit, Tong Bus period is set to the stopping of above-mentioned booster circuit.
X-ray high voltage device the most according to claim 1, it is characterised in that
Size with the supply voltage being supplied to above-mentioned booster circuit is more than predetermined value by above-mentioned boost action control circuit
During the period that period synchronizes is set to above-mentioned booster circuit action, by the phase less than above-mentioned predetermined value for the size of above-mentioned supply voltage
Between be set to above-mentioned booster circuit stopping during.
X-ray high voltage device the most according to claim 1, it is characterised in that
It is also equipped with controlling the tube voltage control circuit of above-mentioned inverter circuit,
Above-mentioned tube voltage control circuit controls above-mentioned inverter circuit, predetermined repeats predetermined defeated in timing synchronization with above-mentioned
During going out the inverter circuit action that voltage exports above-mentioned high voltage transformation/rectification part, make the action of above-mentioned inverter circuit
During the inverter circuit stopped stops,
Above-mentioned boost action control circuit is fed into the phase that size is more than predetermined value of the supply voltage of above-mentioned booster circuit
Between and this inverter circuit action during during overlapping period is set to above-mentioned booster circuit action, be fed into above-mentioned liter of piezoelectricity
Period that the size of the supply voltage on road is less than predetermined value or above-mentioned inverter circuit are set to above-mentioned booster circuit during stopping and stopping
Only period.
5. according to the X-ray high voltage device described in claim 2 or 4, it is characterised in that
Repeat to above-mentioned tube voltage control circuit and the cycle synchronisation of the intermittent irradiation of the X-ray from above-mentioned X-ray tube above-mentioned
During inverter circuit action and during the stopping of above-mentioned inverter circuit.
6. a method of operation for X-ray high voltage device, this X-ray high voltage device possesses and boosts supply voltage
Booster circuit, the output voltage of above-mentioned booster circuit is converted to the inverter circuit of the alternating voltage of high frequency, to above-mentioned inversion
The output voltage of device circuit is supplied to the high voltage transformation/rectification part of X-ray tube after carrying out boosting and rectification, this X-ray height electricity
The method of operation of pressure device is characterised by,
The output voltage of above-mentioned booster circuit is controlled such that and predetermined liter piezoelectricity with predetermined repetition in timing synchronization
During pressing consistent booster circuit action, make the booster circuit that the action of above-mentioned booster circuit stops stop during；
The multiple above-mentioned booster circuit of parallel configuration,
During being set to above-mentioned booster circuit action, control according to predetermined timing the most in order to multiple above-mentioned booster circuits
Select so that the output voltage of the booster circuit selected is consistent with predetermined booster voltage, in nonoptional period
The action making this booster circuit stops, during being set to the stopping of above-mentioned booster circuit.
The method of operation of X-ray high voltage device the most according to claim 6, it is characterised in that
Control above-mentioned inverter circuit, with above-mentioned predetermined repetition in timing synchronization, predetermined output voltage is exported above-mentioned height
During the inverter circuit action of voltage transformation/rectification part, the inverter circuit that makes the action of above-mentioned inverter circuit stop stops
Only period,
During the period Tong Bu with during this inverter circuit action is set to above-mentioned booster circuit action, will be with above-mentioned inverter
During the period that circuit synchronizes during stopping is set to the stopping of above-mentioned booster circuit.
The method of operation of X-ray high voltage device the most according to claim 6, it is characterised in that
The period that size is more than predetermined value of the supply voltage being fed into above-mentioned booster circuit is set to above-mentioned booster circuit and moves
During work, during period less than above-mentioned predetermined value for the size of above-mentioned supply voltage is set to the stopping of above-mentioned booster circuit.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-242588 | 2011-11-04 | ||
| JP2011242588 | 2011-11-04 | ||
| PCT/JP2012/078087 WO2013065703A1 (en) | 2011-11-04 | 2012-10-31 | X-ray high voltage apparatus and method of operation thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103891415A CN103891415A (en) | 2014-06-25 |
| CN103891415B true CN103891415B (en) | 2016-08-31 |
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| CN201280051074.7A Expired - Fee Related CN103891415B (en) | 2011-11-04 | 2012-10-31 | X-ray high voltage device and method of operation thereof |
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| Country | Link |
|---|---|
| JP (1) | JP6132771B2 (en) |
| CN (1) | CN103891415B (en) |
| WO (1) | WO2013065703A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106231768A (en) * | 2016-07-08 | 2016-12-14 | 南昌泛泰医疗设备有限公司 | The loading method of x-ray device multi units tube combinations of voltages effect |
| GB202203241D0 (en) * | 2019-08-11 | 2022-04-20 | Rapiscan Systems Inc | Systems and methods for using three-dimensional x-ray imaging in meat production and processing applications |
| CN111787676A (en) * | 2020-07-27 | 2020-10-16 | 辽宁道特凯力科技有限公司 | Frequency conversion KV control system of medical diagnosis X-ray high-voltage generator |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4449227A (en) * | 1980-09-13 | 1984-05-15 | Tokyo Shibaura Electric Co | X-Ray apparatus |
| US4484121A (en) * | 1981-06-12 | 1984-11-20 | Thomson-Csf | Servocontrol by ultrasonics of the relative position of two mechanical components |
| US4597026A (en) * | 1983-12-22 | 1986-06-24 | General Electric Company | Inverter variable dead time for X-ray generator |
| US4601051A (en) * | 1983-12-22 | 1986-07-15 | General Electric Company | Protective circuit for X-ray generator |
| CN101765290A (en) * | 2009-12-07 | 2010-06-30 | 芜湖国睿兆伏电子股份有限公司 | High-voltage generator used for X-ray machine and control method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5734697A (en) * | 1980-08-08 | 1982-02-25 | Toshiba Corp | X-ray equipment |
| JPS62198097A (en) * | 1986-02-26 | 1987-09-01 | Hitachi Medical Corp | Inverter type x-ray equipment |
| US5629844A (en) * | 1995-04-05 | 1997-05-13 | International Power Group, Inc. | High voltage power supply having multiple high voltage generators |
| JP3644610B2 (en) * | 1995-11-09 | 2005-05-11 | 株式会社日立メディコ | Inverter X-ray high voltage device |
| JP2007184997A (en) * | 2005-10-04 | 2007-07-19 | Matsushita Electric Ind Co Ltd | Inverter apparatus |
-
2012
- 2012-10-31 WO PCT/JP2012/078087 patent/WO2013065703A1/en active Application Filing
- 2012-10-31 JP JP2013541795A patent/JP6132771B2/en active Active
- 2012-10-31 CN CN201280051074.7A patent/CN103891415B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4449227A (en) * | 1980-09-13 | 1984-05-15 | Tokyo Shibaura Electric Co | X-Ray apparatus |
| US4484121A (en) * | 1981-06-12 | 1984-11-20 | Thomson-Csf | Servocontrol by ultrasonics of the relative position of two mechanical components |
| US4597026A (en) * | 1983-12-22 | 1986-06-24 | General Electric Company | Inverter variable dead time for X-ray generator |
| US4601051A (en) * | 1983-12-22 | 1986-07-15 | General Electric Company | Protective circuit for X-ray generator |
| CN101765290A (en) * | 2009-12-07 | 2010-06-30 | 芜湖国睿兆伏电子股份有限公司 | High-voltage generator used for X-ray machine and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103891415A (en) | 2014-06-25 |
| JP6132771B2 (en) | 2017-05-24 |
| JPWO2013065703A1 (en) | 2015-04-02 |
| WO2013065703A1 (en) | 2013-05-10 |
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