WO2015199218A1 - Dispositif haute tension - Google Patents

Dispositif haute tension Download PDF

Info

Publication number
WO2015199218A1
WO2015199218A1 PCT/JP2015/068506 JP2015068506W WO2015199218A1 WO 2015199218 A1 WO2015199218 A1 WO 2015199218A1 JP 2015068506 W JP2015068506 W JP 2015068506W WO 2015199218 A1 WO2015199218 A1 WO 2015199218A1
Authority
WO
WIPO (PCT)
Prior art keywords
inverter
mode
high voltage
voltage device
voltage
Prior art date
Application number
PCT/JP2015/068506
Other languages
English (en)
Japanese (ja)
Inventor
祐樹 河口
庄司　浩幸
浩和 飯嶋
美奈 チャホン小川
堂本　拓也
Original Assignee
株式会社日立メディコ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社日立メディコ filed Critical 株式会社日立メディコ
Publication of WO2015199218A1 publication Critical patent/WO2015199218A1/fr

Links

Images

Classifications

    • 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
    • H05G1/20—Power supply arrangements for feeding the X-ray tube with high-frequency ac; with pulse trains
    • 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
    • H05G1/26—Measuring, controlling or protecting
    • H05G1/30—Controlling
    • H05G1/32—Supply voltage of the X-ray apparatus or tube

Definitions

  • the present invention relates to an X-ray apparatus such as an X-ray CT apparatus and a general X-ray imaging apparatus, and a high voltage apparatus that supplies a high DC voltage to a load.
  • a converter that inputs a commercial power supply and outputs a DC voltage
  • an inverter that inputs a DC voltage and generates a high-frequency AC voltage
  • a rectifier circuit for example, a multi-stage voltage doubler rectifier circuit or a Cockcroft-Walton circuit
  • It is configured to supply.
  • the drive frequency of the inverter As a means for solving this problem, it is known to increase the drive frequency of the inverter. By increasing the drive frequency of the inverter, the AC voltage supplied to the rectifier circuit can be increased, so that the capacitor capacity can be reduced while suppressing the pulsation of the tube voltage. By reducing the capacitor capacity, the rise and fall of the tube voltage can be speeded up. Further, the response speed of the output voltage can be improved by increasing the drive frequency of the inverter. However, if the drive frequency of the inverter is simply increased, the switching loss increases. Therefore, there is a problem that it becomes difficult to cool the switching element, particularly when shooting with a constant tube voltage maintained for a long time.
  • Non-Patent Document 3 is disclosed as means for speeding up the start-up of the X-ray high-voltage device.
  • the output power supplied from the inverter to the rectifier circuit is increased as compared with the steady period, so that the rising speed of the tube voltage is increased.
  • Non-Patent Document 3 when the smoothing capacitor capacity is the same, it is necessary to increase the output current of the inverter in proportion to the increase in the rising speed of the tube voltage. There are challenges that will be difficult. Moreover, since the fall of the tube voltage depends on the equivalent resistance value of the X-ray tube and the time constant of the capacitance of the smoothing capacitor, the technique described in Non-Patent Document 3 speeds up the fall of the tube voltage. Is difficult.
  • the present invention is connected between a DC power source and a resonance circuit, and is connected between an inverter that converts a DC voltage into an AC voltage, the resonance circuit, and the resonance circuit and a load.
  • a high voltage apparatus comprising: a rectifier circuit that rectifies an AC voltage and supplies a DC voltage to a load; and a control unit that controls the inverter, wherein the control unit resonates from the inverter to the resonance circuit.
  • the first mode in which the frequency of the current operates to be substantially equal to the frequency for driving the inverter, and the frequency of the resonance current supplied from the inverter to the resonance circuit is the (natural number + 1) of the frequency for driving the inverter. )
  • a second mode that operates so as to be doubled, and a switching unit that switches between the first mode and the second mode.
  • the smoothing capacitor capacity while suppressing an increase in switching loss of the inverter in a steady period. Furthermore, since the drive frequency of the inverter can be increased only during the rising period of the output voltage, a high voltage device that achieves both low inverter loss during the steady period and high speed of rising and falling of the output voltage. Can be provided.
  • FIG. 1 is a circuit configuration diagram of a high voltage device according to Embodiment 1.
  • FIG. 3 is a flowchart for explaining the operation of the high-voltage device according to the first embodiment.
  • FIG. 4 is a waveform diagram for explaining the operation of the high voltage device according to the first embodiment.
  • FIG. 4 is a waveform diagram for explaining the operation of the high voltage device according to the first embodiment.
  • FIG. 4 is a waveform diagram for explaining the operation of the high voltage device according to the first embodiment.
  • FIG. 3 is a circuit configuration diagram of a high voltage device according to a second embodiment. The wave form diagram explaining operation
  • FIG. FIG. 6 is a circuit configuration diagram of a high voltage device according to a third embodiment.
  • FIG. 6 is a waveform diagram for explaining the operation of the high voltage device according to the third embodiment.
  • FIG. 6 is a circuit configuration diagram of a high voltage device according to a fourth embodiment.
  • 10 is a flowchart for explaining the operation of the high voltage device according to the fourth embodiment.
  • FIG. 1 is a circuit configuration diagram of a high-voltage device according to Embodiment 1 of the present invention.
  • This high-voltage device includes a DC power source 1 as a power source, and includes an inverter 2, a resonance circuit 3, a rectifier circuit 4, a control unit 5, and a voltage detection unit 6.
  • a DC voltage is supplied to an X-ray tube 7 as a load. Supply high voltage.
  • the inverter 2 receives the DC power source 1 and outputs an AC voltage having an arbitrary frequency to the resonance circuit 3, and is composed of switching elements Q1 to Q4 connected in a bridge, and each of the switching elements Q1 to Q4 has a reverse polarity. Parallel diodes D1 to D4 are connected.
  • the resonant circuit 3 includes a transformer 31 and a parallel resonant capacitor Cp connected in parallel to both ends of the secondary winding N2, and supplies high-frequency AC power to the rectifier circuit 4.
  • the transformer 31 includes a resonant inductor Lr connected in series with the primary winding N1, a primary winding N1, a magnetic core T1, and a secondary winding N2.
  • the rectifier circuit 4 includes bridge-connected rectifier diodes Dr1 to Dr4 and a smoothing capacitor Cm.
  • the rectifier circuit 4 rectifies and smoothes the AC voltage output between the terminals of the parallel resonant capacitor Cp and supplies the DC voltage to the load 7. .
  • a high voltage of about several tens to one hundred kV is applied to the rectifier diodes Dr1 to Dr4
  • a configuration in which a plurality of elements are connected in series is used.
  • a balancing capacitor for equalizing the voltage applied to the elements may be connected in parallel with the elements.
  • the control means 5 controls the switching elements Q1 to Q4, and includes a gate signal generation means 51 for generating gate signals of the switching elements Q1 to Q4, a basic resonance mode 53, an N-fold resonance mode 54, and a switching means. 52.
  • the control means 5 is connected to the voltage detection means 6 and can detect the voltage of the X-ray tube 7 (hereinafter referred to as tube voltage).
  • the switching unit 52 switches between the basic resonance mode 53 and the N-fold resonance mode 54 based on the tube voltage detected from the voltage detection unit 6.
  • the inverter 2 operates as a resonant inverter in which the inverter output current I1 (hereinafter referred to as the resonant current I1) supplied to the resonant circuit 3 is sinusoidal.
  • the inverter 2 is operated so that the frequency of the resonance current I1 supplied from the inverter 2 to the resonance circuit 3 is substantially equal to the drive frequency of the inverter 2.
  • being approximately equal means that the relationship between the drive frequency fsw of the inverter 2 and the frequency fr of the resonance current I1 operates as a general resonance inverter that satisfies the equation (1).
  • the inverter 2 is operated so that the frequency of the resonance current I1 supplied from the inverter 2 to the resonance circuit 3 is N times the drive frequency of the inverter 2.
  • N hereinafter referred to as a multiple
  • N represents (natural number + 1).
  • FIG. 2 is a flowchart showing the logic of the operation from the rising period of the high voltage device of FIG. 1 to the transition to the steady period.
  • S100 to S105 in FIG. 2 indicate Step 100 to Step 105.
  • FIG. 3 shows changes of the output voltage V1, the resonance current I1, and the tube voltage Vx of the inverter 2 with time t.
  • FIG. 4 shows an enlarged operation waveform in the vicinity of time t1 in FIG. 3, depending on the time t of the gate signals G1 to G4 for controlling the switching elements Q1 to Q4, the output voltage V1 of the inverter 2, the resonance current I1, and the tube voltage Vx. It shows a change.
  • the currents in all the operation waveform diagrams including FIG. 3 are positive in the current flowing from the left to the right in each element in the circuit diagram of FIG.
  • the drive frequency fsw of the inverter and the constants of the resonance circuit 3 are set so that the frequency of the resonance current I1 in the basic resonance mode 53 and the frequency of the resonance current I1 in the N-fold resonance mode 54 shown in FIG. Set.
  • the constant of the resonance circuit 3 is the same in the basic resonance mode 53 and the N-fold resonance mode 54.
  • the target value Vx1 and the switching command value Vx2 may be set to different values.
  • the switching means 52 sets the inverter 2 to the basic resonance mode 53 and starts the operation (period t0 to t1 in FIG. 3). .
  • the drive frequency fsw of the inverter 2 operates at a predetermined constant value fsw1.
  • the voltage detection means 6 compares the tube voltage Vx and the switching command value Vx2, and determines the switching of the operation mode of the inverter 2.
  • Step 103 If it is determined in step 102 that the tube voltage Vx has reached the switching command value Vx2 (time t1 in FIG. 3), the switching means 52 switches the inverter 2 to the N-fold resonance mode 54 (from time t1 to time t1 in FIG. 3). timing of t3). At this time, as shown in FIG. 4, the switching means 52 is synchronized with the operation period of the basic resonance mode 53 (the H signal or L signal of the gate signals G1, G4 and the H signal or L signal of the gate signals G2, G3). The operation mode is shifted at the timing of switching.
  • the drive frequency fsw of the inverter 2 operates at a value set in advance according to the tube voltage target value Vx1.
  • the pulsation ⁇ Vx of the tube voltage Vx occurs at the operation mode switching timing, it is considered that there is no problem because it is a rising period.
  • Step 104 the inverter 2 is operated in the N-fold resonance mode 54, the tube voltage Vx detected by the voltage detection means 6 is compared with the target value Vx1, and the transition to the steady period is determined.
  • step 105 In step 104, when the tube voltage Vx reaches the target value Vx1 (time t2 in FIG. 3), it is determined that the tube voltage has shifted to the steady period, and the flow proceeds to step 105.
  • step 105 although not shown in FIG. 1, an instruction to start photographing is transmitted from the control means 5 to the host system. At this time, the inverter 2 continues to operate in the N-fold resonance mode 54.
  • the high voltage device of this embodiment suppresses the pulsation of the tube voltage without increasing the drive frequency fsw of the inverter 2 by setting the operation mode of the inverter 2 in the steady period to the N-fold resonance mode 54.
  • the smoothing capacitor capacity of the rectifier circuit 4 can be reduced.
  • the driving frequency fsw1 in the rising period is changed to the driving frequency fsw2 in the steady period by switching the operation mode of the inverter 2 to the basic resonance mode 53 and the N-fold resonance mode 54 according to the tube voltage condition. Compared with this, the frequency can be increased.
  • the response speed of the output voltage can be improved.
  • FIG. 5 shows an example in which the tube voltage target value Vx1 at the time of photographing instructed by the host system and the tube voltage target value Vx2 for determining the timing for switching the operation mode of the inverter 2 are different conditions (Vx1 ⁇ Vx2). Show.
  • the tube voltage switching command value Vx2 is set to a value lower than the target value Vx1.
  • the pulsation width ⁇ Vx of the tube voltage Vx generated at the switching timing of the operation mode can be suppressed to a small value.
  • the rise of the tube voltage can be further increased.
  • the operation mode of the inverter by switching the operation mode of the inverter to the basic resonance mode and the N-fold resonance mode according to the tube voltage condition, the rise of the tube voltage is suppressed while suppressing the loss of the inverter in the steady period.
  • the speed can be increased.
  • the switching timing between the basic resonance mode and the N-fold resonance mode is determined based on the value of the tube voltage, but is not limited thereto.
  • a counter may be provided inside the control means, and the operation mode may be changed based on the elapsed time from the start of each operation mode.
  • FIG. 6 is a circuit configuration diagram of a high voltage device according to the second embodiment of the present invention.
  • FIG. 7 shows operation waveforms of the high voltage device of FIG. Similar to the high voltage device of the first embodiment, this high voltage device uses a DC power source 1 as a power source, and includes an inverter 2, a resonance circuit 203, a rectifier circuit 204, a control means 205, and a voltage detection means 6.
  • the high voltage of direct current is supplied to the X-ray tube 7 which is a load.
  • the difference from the first embodiment is that a series resonant capacitor Cs connected in series with the primary winding N11 is connected to the resonance circuit 203, a point that the cock croft circuit is connected in multiple stages in the rectifier circuit 204, and control.
  • the N-fold resonance mode 54 in the means 205 is provided with a feedback loop of the tube voltage Vx.
  • PI control may be used as a method for calculating the drive frequency fsw, or it is derived from a table showing the relationship between the prepared difference between the tube voltage Vx and the command value Vx1 and the drive frequency fsw of the inverter 2. Also good.
  • the resonance current I1a in the rising period may be larger than the resonance current I1b in the steady period. In this regard, there is no problem because the time is shorter than the entire operation period. (Mode 3) Times t22 to t23 in FIG.
  • the control unit 205 determines that the tube voltage has reached the steady period, and transmits a command to start imaging to the host system. At this time, the inverter 2 is continuously operated in the N-fold resonance mode 54.
  • the N-fold resonance mode 54 of the control unit 205 is provided with a feedback loop of the tube voltage Vx. As a result, it is possible to shorten the period (the period from time t21 to t22 in FIG. 7) until the tube voltage reaches the target value Vx1 after the operation mode of the inverter 2 is switched to the N-fold resonance mode 54. Compared to 1, the rise of the tube voltage Vx can be further increased.
  • FIG. 8 is a circuit configuration diagram of the high voltage device according to the third embodiment of the present invention.
  • FIG. 9 shows operation waveforms of the high voltage device of FIG. Similar to the high voltage device of the second embodiment, this high voltage device uses a DC power source 1 as a power source, and includes an inverter 2, a resonance circuit 303, a rectifier circuit 304, a control means 305, and a voltage detection means 6.
  • the high voltage of direct current is supplied to the X-ray tube 7 which is a load.
  • the difference from the second embodiment is that the secondary winding of the transformer in the resonance circuit 303 is divided into the secondary winding N21 and the secondary winding N22, and the secondary winding N21 and the secondary winding are configured.
  • the current detection means 8 for detecting the current I1 is provided, and the basic resonance mode 53 in the control means 305 is provided with a feedback loop for the resonance current I1 and a feedback loop for the tube voltage Vx.
  • the current detection means 8 detects the average value or peak value of the resonance current I 1 and inputs it to the control means 305.
  • Mode 1 Period from Time t0 to t32
  • the inverter 2 operates in the basic resonance mode 53.
  • the basic resonance mode 53 is based on the difference between the resonance current I1 detected by the current detector 8 and the target value I1ref so that the resonance current I1 approaches the target value I1ref by using a feedback loop of the resonance current I1.
  • the drive frequency fsw of the inverter 2 is determined. In the operation of FIG.
  • the target value I1ref is set so that the resonance current I1a in the rising period becomes a value (I1a> I1b) larger than the resonance current I1b in the steady period. This period is continued until the tube voltage Vx reaches the command value Vx22.
  • (Mode 2) Period from Time t32 to t33
  • the basic resonance mode 53 is switched to a feedback loop of the tube voltage Vx.
  • the drive frequency fsw of the inverter 2 is determined based on the difference between the tube voltage value Vx detected by the voltage detection means 6 and the switching command value Vx2. This period is continued until the tube voltage Vx reaches the switching command value Vx2.
  • the basic resonance mode 53 is provided with the feedback loop of the resonance current I1 and the feedback loop of the tube voltage Vx.
  • the basic resonance mode period can be shortened by setting the target value of the resonance current so that the resonance current during the rising period becomes larger than the steady period. It is possible to further increase the speed of the rise.
  • the current detection means 8 detects the average value or peak value of the resonance current I1, but the zero cross point of the resonance current I1 may be detected. By detecting the zero-cross point of the resonance current, it is possible to determine whether the drive frequency fsw of the inverter 2 and the resonance current frequency have a predetermined relationship. Further, in the high voltage device of the present embodiment, the operation mode of the inverter 2 is switched by detecting the tube voltage Vx, but the present invention is not limited to this. For example, the voltage across the smoothing capacitor Cm1 of the rectifier circuit 204 may be detected, and the operation mode of the inverter 2 may be switched according to the value of the voltage across the smoothing capacitor Cm1.
  • the basic resonance mode 53 is provided with the feedback loop for the resonance current I1
  • the N-fold resonance mode 54 may also be provided with a feedback loop for the resonance current I1.
  • FIG. 10 is a circuit configuration diagram of a high voltage device according to the fourth embodiment of the present invention.
  • FIG. 11 is a flowchart of the operation logic until the operation pattern of the high voltage device shown in FIG. 10 is determined.
  • S400 to S408 in FIG. 11 indicate Step 400 to Step 408.
  • FIGS. 12 to 14 are diagrams showing operation patterns 1 to 3 of the high-voltage device of FIG. 10 and show changes of the inverter drive frequency fsw, inverter output voltage V1, inverter output current I1, and tube voltage Vx with time t. ing.
  • this high voltage device uses a DC voltage 1 as a power source, and includes an inverter 2, a resonance circuit 303, a rectifier circuit 304, a control means 405, and a voltage detection means 6.
  • the high voltage of direct current is supplied to the X-ray tube 7 which is a load.
  • an operation mode switching unit 455 and an operation pattern determination unit 456 are provided in the switching unit 452 and a photographing pattern selection unit 9 is provided.
  • Step 400 arbitrary shooting pattern information corresponding to the shooting location and the condition of the subject is input to the shooting pattern selection unit 9 from the outside.
  • the shooting pattern selection means 9 extracts the pattern of the tube voltage Vx from the start to the stop of the high voltage device based on the input shooting pattern information.
  • Step 401 the tube voltage pattern extracted in step 400 is transmitted to the operation pattern determining means 456 inside the switching means 452. Then, the process proceeds to step 402.
  • Step 402 the operation pattern determination means 456 determines whether or not the tube voltage Vx is switched based on the tube voltage Vx pattern transmitted from the imaging pattern selection means 9. If it is necessary to switch the tube voltage Vx (S401: YES), the process proceeds to step 404. If it is not necessary to switch the tube voltage (S401: NO), the process proceeds to step 403. (Step 403) In step 403, the operation pattern 1 determined by the operation pattern determination unit 456 is transmitted to the operation mode switching unit 455. When the transmission of the operation pattern is completed, the process proceeds to step 407. (Step 404) In step 404, the tube voltage switching period T and the determination value Tb are compared based on the pulse pattern of the tube voltage Vx transmitted from the imaging pattern selection means 9.
  • Step 405 a value determined in advance based on the output voltage characteristics of the high-voltage device acquired in advance is used.
  • the process proceeds to step 405.
  • step 405 the operation pattern 2 determined by the operation pattern determination unit 456 is transmitted to the operation mode switching unit 455.
  • the process proceeds to step 407.
  • step 406 If it is determined in step 404 that the tube voltage switching period T is T ⁇ Tb (S403: YES), the process proceeds to step 406.
  • the operation pattern 3 determined by the operation pattern determination unit 456 is transmitted to the operation mode switching unit 455.
  • step 407 it is detected that an operation pattern has been transmitted to the operation mode switching means 455, and an operation mode at the time of activation is set based on the designated operation pattern.
  • Step 408 When the setting of the operation mode is completed in step 407, the operation of the high voltage device is started.
  • the operation pattern of the high voltage device is set based on the information of the preset shooting pattern.
  • the operation pattern 1 is an example of the operation of the high voltage device in the general imaging mode in which imaging is performed with the tube voltage being constant, and the operation pattern 2 and the operation pattern 3 are multi-energy imaging in which imaging is performed by switching a plurality of tube voltage values.
  • 2 shows an example of the operation of a high voltage device in mode.
  • the constants of the resonance circuit 303 are the same.
  • the inverter 2 is operated in the N-fold resonance mode 54 in the period from the start of the high voltage device to the end of photographing (period from time 0 to time t42 in FIG. 12).
  • the inverter 2 enters a stop mode in which the switching operation is stopped, and continues until the tube voltage becomes zero.
  • the falling period depends on the capacitances of the smoothing capacitors Cm1 and Cm2 of the rectifier circuit 304 and the time constant of the equivalent resistance value of the X-ray tube.
  • the drive frequency fsw of the inverter 2 is set to 1 / N of the basic resonance mode 53. Therefore, the response speed of the tube voltage is lower than that in the basic resonance mode 53.
  • the switching loss of the inverter 2 can be suppressed, it can be said that it is suitable for long-term imaging with a constant tube voltage.
  • the entire period from the start to the end of imaging is operated in the N-fold resonance mode 54, but the present invention is not limited to this.
  • the inverter 2 may be operated in the basic resonance mode 53 when it is necessary to rapidly increase the tube voltage, such as when the tube voltage sharply decreases during imaging due to abnormal discharge of the X-ray tube.
  • the operation pattern 2 shows the operation of the high voltage device when the tube voltage is switched during the photographing period.
  • the tube voltage rising period (time t0 to t51 in FIG. 13 and time t55 to 56) is operated in the basic resonance mode 53, and the steady period (time t51 in FIG. 13).
  • the falling period of the tube voltage periods t53 to t54, times t58 to t59, and times t60 to 61 in FIG.
  • the inverter 2 is set to the stop mode.
  • the inverter 2 is operated in the basic resonance mode 53 only during the rising period of the tube voltage. For this reason, compared with the operation pattern 1, the rise of the tube voltage can be speeded up. Further, the switching loss can be suppressed by operating the inverter 2 in the N-fold resonance mode during the steady period.
  • the operation pattern 2 is an operation pattern in which both the rise of the tube voltage is accelerated and the loss of the inverter is reduced, and it can be said that the operation pattern 2 is suitable for an imaging mode in which the tube voltage is switched at a relatively long cycle. (Operation pattern 3)
  • the operation pattern 3 will be described with reference to FIG.
  • the operation pattern 3 shows the operation of the high-voltage device when the tube voltage is switched during the photographing period as in the operation pattern 2.
  • the tube voltage switching width ⁇ Vx14 is larger ( ⁇ Vx14> ⁇ Vx13), and the tube voltage switching period Tm43 is shorter (Tm43 ⁇ Tm42).
  • the operation pattern 3 requires a faster rise in tube voltage than the operation pattern 2. Therefore, in the operation pattern 3 in FIG. 14, the tube voltage rise period (time t600 to t601 and time t604 to t605 in FIG. 14) and steady period (time t601 to t602, time t603 to t604 in FIG.
  • the inverter 2 is operated in the basic resonance mode 53 that can increase the response speed of the tube voltage compared to the N-fold resonance mode 54.
  • the tube voltage falling period (time t602 to t603 and time t606 to 607 in FIG. 14) is set to a stop mode in which the switching operation of the inverter 2 is stopped, similarly to the operation patterns 1 and 2.
  • the switching loss increases.
  • the operation pattern 3 is suitable for the imaging mode in which the switching range of the tube voltage is large and the tube voltage is switched at high speed in a short cycle.
  • the operation pattern of the high voltage device suitable for the set load condition can be selected by switching the operation mode of the inverter based on the preset load condition.
  • the constants of the resonance circuit 303 are the same in the basic resonance mode 53 and the N-fold resonance mode 54, but different constants may be used in the basic resonance mode 53 and the N-fold resonance mode 54.
  • a switch and a capacitor may be connected in parallel with the series resonance capacitor Cs, and the resonance circuit may be changed by switching the switch on / off depending on the operation mode of the inverter 2.
  • the present invention can be applied even to a high voltage device including two or more inverters and a rectifier circuit, for example. Is possible. In all the embodiments, the present invention can also be applied to a DC power supply as an output of an AC-DC converter or a DC-DC converter.
  • the high voltage device of the present invention can be applied to a power supply device that supplies a high DC voltage to a load, such as an X-ray diagnostic imaging device or a vacuum deposition electron gun.

Abstract

La présente invention concerne un dispositif haute tension, dans lequel il est possible de réduire les temps de montée et de descente de la tension de sortie tout en supprimant la perte de commutation pendant la période normale. Le dispositif haute tension est équipé : d'un onduleur connecté entre une alimentation électrique CC et un circuit de résonance et qui convertit une tension CC en une tension CA, dudit circuit de résonance ; d'un circuit redresseur connecté entre ledit circuit de résonance et une charge, qui redresse la tension CA et fournit une tension CC à la charge ; et d'un moyen de commande destinée à commander ledit onduleur. Dans le dispositif haute tension, ledit moyen de commande est équipé : d'un premier mode dans lequel ledit onduleur fonctionne pour que la fréquence du courant de résonance fourni audit circuit de résonance par ledit onduleur devienne sensiblement égale à la fréquence à laquelle ledit onduleur est entraîné ; d'un second mode dans lequel ledit onduleur fonctionne pour que la fréquence du courant de résonance fourni audit circuit de résonance par ledit onduleur devienne (nombre naturel +1) fois la fréquence à laquelle ledit onduleur est entraîné ; et d'un moyen de commutation destiné à commuter entre ledit premier mode et ledit second mode.
PCT/JP2015/068506 2014-06-27 2015-06-26 Dispositif haute tension WO2015199218A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014132013A JP6463913B2 (ja) 2014-06-27 2014-06-27 高電圧装置
JP2014-132013 2014-06-27

Publications (1)

Publication Number Publication Date
WO2015199218A1 true WO2015199218A1 (fr) 2015-12-30

Family

ID=54938295

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/068506 WO2015199218A1 (fr) 2014-06-27 2015-06-26 Dispositif haute tension

Country Status (2)

Country Link
JP (1) JP6463913B2 (fr)
WO (1) WO2015199218A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200137862A1 (en) * 2018-10-26 2020-04-30 Hitachi, Ltd. High voltage generating device and x-ray image diagnosis apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6890978B2 (ja) * 2017-01-11 2021-06-18 日本電波株式会社 静電コーティング装置用高電圧電源装置
EP3997966A1 (fr) * 2019-07-09 2022-05-18 Varex Imaging Corporation Pilote de canon à électrons

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09289093A (ja) * 1996-04-23 1997-11-04 Matsushita Electric Works Ltd 放電灯点灯装置
JP2006210267A (ja) * 2005-01-31 2006-08-10 Toshiba Lighting & Technology Corp 放電ランプ点灯装置および照明器具
JP2010283998A (ja) * 2007-12-06 2010-12-16 Universal Lighting Technologies Inc ゼロ電流スイッチングおよび任意周波数のパルス幅変調を利用した共振インバータの駆動方法
JP2011139618A (ja) * 2010-01-04 2011-07-14 Origin Electric Co Ltd 直流高電圧発生装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09289093A (ja) * 1996-04-23 1997-11-04 Matsushita Electric Works Ltd 放電灯点灯装置
JP2006210267A (ja) * 2005-01-31 2006-08-10 Toshiba Lighting & Technology Corp 放電ランプ点灯装置および照明器具
JP2010283998A (ja) * 2007-12-06 2010-12-16 Universal Lighting Technologies Inc ゼロ電流スイッチングおよび任意周波数のパルス幅変調を利用した共振インバータの駆動方法
JP2011139618A (ja) * 2010-01-04 2011-07-14 Origin Electric Co Ltd 直流高電圧発生装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200137862A1 (en) * 2018-10-26 2020-04-30 Hitachi, Ltd. High voltage generating device and x-ray image diagnosis apparatus

Also Published As

Publication number Publication date
JP6463913B2 (ja) 2019-02-06
JP2016012397A (ja) 2016-01-21

Similar Documents

Publication Publication Date Title
JP4958052B2 (ja) 系統電力平準化装置および画像診断システム
US8385504B2 (en) DC/AC power inverter control unit of a resonant power converter circuit, in particular a DC/DC converter for use in a high-voltage generator circuitry of a modern computed tomography device or X-ray radiographic system
TWI506939B (zh) Ac/dc功率轉換器、電力供應器及將ac輸入電壓轉換成dc輸出電壓之系統
JP6341386B2 (ja) スイッチング電源装置
JP6289618B2 (ja) 電力変換装置
JP6335889B2 (ja) 共振型ｄｃ−ｄｃコンバータのための制御モード
WO2015199218A1 (fr) Dispositif haute tension
JP5114079B2 (ja) 電源装置、高周波回路システム及びヒータ電圧制御方法
JP6830381B2 (ja) 高電圧発生装置、およびそれを搭載するｘ線画像診断装置
WO2018025526A1 (fr) Dispositif de génération de haute tension et dispositif d'imagerie de diagnostic par rayons x monté à l'aide dudit dispositif
JP7133436B2 (ja) 高電圧装置およびｘ線画像診断装置
JP2007207585A (ja) インバータ式ｘ線高電圧装置
JP2016173961A (ja) 電力変換装置
JP2016226134A (ja) 電力変換装置及び電力変換制御法
JP5309422B2 (ja) Ｘ線高電圧装置
JP6575462B2 (ja) 電圧変換装置
JP2010081697A (ja) 共振型電力変換装置
JP6598874B2 (ja) 電力変換装置
KR102629718B1 (ko) 고전압출력 전원공급장치 및 그 장치의 동작방법
JP7034230B1 (ja) 電力変換装置
JPH0279399A (ja) 共振型インバータ式ｘ線装置
JP3053920B2 (ja) 高電圧発生装置
JP7053391B2 (ja) 高電圧発生装置およびｘ線画像診断装置
JP2022115528A (ja) Ｘ線高電圧装置及びｘ線撮像装置
JP2014060023A (ja) Ｘ線高電圧発生装置、及び移動型ｘ線透視撮影装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15811377

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15811377

Country of ref document: EP

Kind code of ref document: A1