JP2814016B2 - X-ray power supply - Google Patents
X-ray power supplyInfo
- Publication number
- JP2814016B2 JP2814016B2 JP26111090A JP26111090A JP2814016B2 JP 2814016 B2 JP2814016 B2 JP 2814016B2 JP 26111090 A JP26111090 A JP 26111090A JP 26111090 A JP26111090 A JP 26111090A JP 2814016 B2 JP2814016 B2 JP 2814016B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- grounded
- diode
- power supply
- cable
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
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- X-Ray Techniques (AREA)
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は，高周波インバータを用いたＸ線電源装置に
関する。Description: TECHNICAL FIELD The present invention relates to an X-ray power supply using a high-frequency inverter.
近年，数kHz〜数十kHzの高周波インバータを用いたＸ
線電源装置が，高速応答性，低リプル性の利点から実用
化されている。第４図に，従来のこの種のＸ線電源装置
の例を示す。蓄電池または整流器等の直流電源１と，該
直流電源１で付勢される高周波インバータ２と，高圧ト
ランス３と，直列の２個の高圧ダイオード4,5と，直列
の２個のコンデンサ6,7からなる全波倍電圧整流回路８
とでＸ線電源装置が構成される。通常，高圧トランス３
及び整流回路８は，絶縁油で充填され，且つ接地された
金属性の高圧タンク９内に収容されている。このＸ線電
源装置の出力は，出力端子10から高圧ケーブル11でＸ線
管12のカソードＫに接続されている。Ｘ線管12のアノー
ドＡは接地されている。高圧ケーブル11の外被導体11a
は高圧タンク９のケースを通して接地されている。13は
全波倍電圧整流回路８の接地電流から管電流を測定する
ためのシャント抵抗,14は管電流検出回路である。なお
管電流を検出するには,X線管12のアノードを直接電流測
定すればよいのであるが,X線装置の構造上，アノードに
電流検出回路を挿入できない場合が多い。Ｘ線管12を動
作させるためには，更にフィラメント電源が必要である
が，本発明に直接関係がないので，説明を省略する。In recent years, X using a high frequency inverter of several kHz to several tens kHz has been developed.
Line power supplies have been put into practical use because of the advantages of high-speed response and low ripple. FIG. 4 shows an example of this type of conventional X-ray power supply device. A DC power supply 1 such as a storage battery or a rectifier, a high-frequency inverter 2 energized by the DC power supply 1, a high-voltage transformer 3, two high-voltage diodes 4,5 in series, and two capacitors 6,7 in series. Full-wave voltage rectifier circuit 8 consisting of
Thus, the X-ray power supply device is configured. Normally, high-voltage transformer 3
The rectifying circuit 8 is housed in a metallic high-pressure tank 9 which is filled with insulating oil and grounded. The output of the X-ray power supply is connected from the output terminal 10 to the cathode K of the X-ray tube 12 via a high-voltage cable 11. The anode A of the X-ray tube 12 is grounded. Outer conductor 11a of high-voltage cable 11
Is grounded through the case of the high-pressure tank 9. Reference numeral 13 denotes a shunt resistor for measuring a tube current from the ground current of the full-wave voltage doubler rectifier circuit 8, and reference numeral 14 denotes a tube current detection circuit. Note that the tube current can be detected by directly measuring the current of the anode of the X-ray tube 12. However, due to the structure of the X-ray device, it is often impossible to insert a current detection circuit into the anode. In order to operate the X-ray tube 12, a filament power source is required, but the description is omitted because it is not directly related to the present invention.
この回路の動作を説明すると，インバータ２の高周波
出力電圧は，高圧トランス３の１次巻線N1に供給され
る。高圧トランス３の２次巻線N2の一方の端子はダイオ
ード4,5の中点に，他方の端子はコンデンサ6,7の中点に
接続されている。２次巻線N2で発生する電圧をＥとする
と，整流電圧は−2Eとなる。この電圧は高圧ケーブル11
の芯線11bにより,X線管12のカソードＫに供給される。
このような高周波方式のＸ線電源装置では，高圧ケーブ
ル11の芯線11bと接地外被導体11a間の静電容量が充分な
フィルタ作用を持ち,X線管12のアノードA,カソードＫ間
に印加される電圧の高周波リプルを低減できる利点があ
る。この高周波リプル電圧の周波数成分は，インバータ
動作周波数の２倍であり，インバータ２の周波数が高い
程，リプルは低減される。このような従来のＸ線電源装
置の高圧トランス３は，第５図に示すような巻線構造を
とる。鉄心15の１脚に１次巻線N1が巻かれ，この１次巻
線N1の上に２次巻線N2が別個に巻かれる。２次巻線N2の
巻始の端子ａは電圧Ｅが加わるので，それ以上の耐圧を
持つ絶縁ボビン16に巻かれる。Explaining the operation of this circuit, the high frequency output voltage of the inverter 2 is supplied to the primary winding N1 of the high voltage transformer 3. One terminal of the secondary winding N2 of the high-voltage transformer 3 is connected to the middle point of the diodes 4 and 5, and the other terminal is connected to the middle point of the capacitors 6 and 7. Assuming that the voltage generated in the secondary winding N2 is E, the rectified voltage is -2E. This voltage is high voltage cable 11
Is supplied to the cathode K of the X-ray tube 12.
In such a high-frequency X-ray power supply device, the capacitance between the core wire 11b of the high-voltage cable 11 and the grounded outer conductor 11a has a sufficient filtering effect, and is applied between the anode A and the cathode K of the X-ray tube 12. There is an advantage that high-frequency ripple of the applied voltage can be reduced. The frequency component of the high-frequency ripple voltage is twice the operating frequency of the inverter, and the higher the frequency of the inverter 2, the lower the ripple. The high-voltage transformer 3 of such a conventional X-ray power supply device has a winding structure as shown in FIG. A primary winding N1 is wound around one leg of the iron core 15, and a secondary winding N2 is separately wound on the primary winding N1. Since the voltage E is applied to the terminal a at the beginning of the winding of the secondary winding N2, it is wound around the insulating bobbin 16 having a higher withstand voltage.
従来の電源では,2次巻線N2に高耐圧の絶縁ボビンを必
要とすること，倍電圧用に２個のコンデンサ6,7を必要
とする等，コストが高くなる欠点があった。本発明にお
いては，これら高耐圧のコンデンサを省くことにより，
コストを低減させることを課題とする。The conventional power supply has disadvantages in that the cost is high, such as the necessity of an insulating bobbin with a high withstand voltage for the secondary winding N2 and the need of two capacitors 6 and 7 for the voltage doubler. In the present invention, by omitting these high voltage capacitors,
It is an object to reduce costs.
本発明は以上の欠点を除去するために、高周波インバ
ータと、接地した高圧タンクの中にそれぞれ収容された
高圧トランスと第１のダイオードと第２のダイオード
と、芯導線と外被導体とを有する高圧ケーブルと、コン
デンサとからなり、アノード又はカソードを接地したＸ
線管に正又は負の高電圧を供給するＸ線電源装置であっ
て、 前記高圧トランスの一次巻線を前記高周波インバータ
に接続し、前記高圧トランスの二次巻線の一端を接地
し、 前記第１のダイオードと前記第２のダイオードとを直
列接続して、この接続点を前記コンデンサを介して前記
高圧トランスの二次巻線の他の一端に接続し、前記第２
のダイオードの他端を接地し、 前記第１のダイオードの他端を前記高圧ケーブルの芯
導線の一端に接続し、前記高圧ケーブルの外被導体を前
記接地した高圧タンクに接続し、 前記高圧ケーブルの芯導線の他の一端を前記Ｘ線管用
出力端子としてなることを特徴とするＸ線電源装置を提
案するものである。The present invention has a high frequency inverter, a high voltage transformer respectively housed in a grounded high voltage tank, a first diode and a second diode, a core conductor and a sheath conductor, in order to eliminate the above disadvantages. X consisting of a high-voltage cable and a capacitor, with the anode or cathode grounded
An X-ray power supply for supplying a positive or negative high voltage to a wire tube, comprising: connecting a primary winding of the high-voltage transformer to the high-frequency inverter; grounding one end of a secondary winding of the high-voltage transformer; A first diode and the second diode are connected in series, and this connection point is connected to the other end of the secondary winding of the high-voltage transformer via the capacitor.
The other end of the diode is grounded; the other end of the first diode is connected to one end of a core conductor of the high-voltage cable; the jacket conductor of the high-voltage cable is connected to the grounded high-pressure tank; An X-ray power supply device characterized in that the other end of the core conductor is used as the output terminal for the X-ray tube.
このようなＸ線電源装置によれば，従来，単にリプル
低減用フィルタとしてしか利用されなかった高圧ケーブ
ルの静電容量を電圧逓倍にも利用することができるの
で，高圧発生部の構成を単純化して，低コスト化を図る
ことができる。According to such an X-ray power supply device, the capacitance of a high-voltage cable, which has been conventionally used only as a filter for reducing ripples, can be used for voltage multiplication. Therefore, cost can be reduced.
第１図は，本発明の一実施例を説明するための図であ
り，第４図と同一機能のものには同一符号を付した。同
図において，直流電源１の直流電圧を高周波電圧に変換
する高周波インバータ２の出力は，高圧タンク９内の高
圧トランス３の１次巻線N1に供給される。この高圧トラ
ンス３の２次巻線N2の巻き始め端子ｆが接地されてい
る。巻き終わり高圧端子ｇは倍圧用コンデンサ17の一端
に接続されている。また，負極出力端子と接地間に２個
の同極性に直列なダイオード18,19がアノード側を出力
側にして接続され，そのダイオードの中点にコンデンサ
17の他端が接続される。負極出力とＸ線管12のカソード
Ｋは高圧ケーブル11の芯線11bで接続されている。高圧
トランス３の構造の例を第２図に示す。鉄心20の片脚に
１次巻線N1が巻かれ，更にその上に１個の２次巻線N2が
巻かれている。ｆは接地される巻き始め端子,gは高圧側
端子である。FIG. 1 is a diagram for explaining an embodiment of the present invention, in which components having the same functions as in FIG. 4 are denoted by the same reference numerals. In the figure, the output of a high-frequency inverter 2 that converts a DC voltage of a DC power supply 1 into a high-frequency voltage is supplied to a primary winding N1 of a high-voltage transformer 3 in a high-pressure tank 9. The winding start terminal f of the secondary winding N2 of the high voltage transformer 3 is grounded. The winding end high voltage terminal g is connected to one end of the voltage doubler capacitor 17. Two diodes 18 and 19 in series with the same polarity are connected between the negative output terminal and the ground, with the anode side being the output side.
The other end of 17 is connected. The negative electrode output and the cathode K of the X-ray tube 12 are connected by a core wire 11 b of the high-voltage cable 11. FIG. 2 shows an example of the structure of the high-voltage transformer 3. A primary winding N1 is wound around one leg of the iron core 20, and a single secondary winding N2 is wound thereon. f is a winding start terminal to be grounded, and g is a high voltage side terminal.
N2の巻始め側すなわちN1に近い方のコイルはほぼ接地
電位なので，高耐圧のボビンを要しない。The coil on the winding start side of N2, that is, the coil closer to N1 is almost at the ground potential, so that a high withstand voltage bobbin is not required.
第１図に示した回路において，高圧ケーブル11の静電
容量を考慮して等価回路を作ると，第３図となる。但
し，管電流検出回路13,14は含まない。21は高圧ケーブ
ル11の芯線11bと外被導体11a間との静電容量からなるコ
ンデンサである。一般的に用いられるＸ線用の高圧ケー
ブルの静電容量を例えばｍ当たり250pFとすれば，ケー
ブル長を4mとして，コンデンサ21の値は1000pFとなる。
この等価回路で第１図と同一符号は同一等価要素であ
る。この構成は，通常の電源回路に用いられる半波倍電
圧整流回路に他ならない。この倍電圧整流回路によっ
て，高圧トランス３の２次巻線電圧Ｅは−2Eに昇圧整流
され,X線管12のカソードＫに−2Eの電圧を供給する。従
って。２次巻線電圧は，出力電圧の1/2でよい。また,X
線管８のアノード及びカソードに加わる対接地の高調波
リプルは高周波インバータ２の動作周波数と同じであ
る。In the circuit shown in FIG. 1, when an equivalent circuit is created in consideration of the capacitance of the high-voltage cable 11, the circuit shown in FIG. 3 is obtained. However, the tube current detection circuits 13 and 14 are not included. Reference numeral 21 denotes a capacitor having a capacitance between the core wire 11b of the high-voltage cable 11 and the jacket conductor 11a. Assuming that the capacitance of a generally used high-voltage X-ray cable is, for example, 250 pF per m, the value of the capacitor 21 is 1000 pF when the cable length is 4 m.
In this equivalent circuit, the same reference numerals as those in FIG. 1 denote the same equivalent elements. This configuration is nothing but a half-wave voltage rectifier circuit used in a normal power supply circuit. By this voltage doubler rectifier circuit, the secondary winding voltage E of the high voltage transformer 3 is boosted and rectified to -2E, and a voltage of -2E is supplied to the cathode K of the X-ray tube 12. Therefore. The secondary winding voltage may be half the output voltage. Also, X
The harmonic ripple of the ground applied to the anode and cathode of the tube 8 is the same as the operating frequency of the high-frequency inverter 2.
このように本発明によれば，トランスの２次巻線のN1
に近い巻始め側が接地されるので,N2のボビンに高耐圧
を必要としない。また高圧コンデンサの数も基本的に１
個でよい。これらの利点に対し，本発明では出力のリプ
ル周波数がインバータ２の動作周波数と同じで従来の様
に２倍とならずリプルが大きくなり易い欠点があるが，
インバータの動作周波数が高い程，高圧ケーブル11の静
電容量でリプルが低減できるため，大きな欠点にはなら
ない。また，本発明の実施態様として，接地されたダイ
オード19に流れる直流電流から管電流を測定することが
可能である。尚，本発明の実施において,X線管電圧の高
周波リプル電圧をさらに低減する必要がある場合には，
出力端子に高圧ケーブルの静電容量に対し比較的小さい
容量のコンデンサを付加することもよい。実験では，管
電圧50kV,管電流100mAを出力するのに,20kHzの高周波イ
ンバータと，約25kVの２次巻線電圧を発生するトランス
と,1000pF30kVの昇圧コンデンサと，耐圧60kVの高圧ダ
イオード２個と,4mの高圧ケーブル（各1000pF）によ
り，充分に実用可能な出力特性を得ることができた。Thus, according to the present invention, the N1 of the secondary winding of the transformer is
Since the winding start side close to is grounded, the N2 bobbin does not require a high withstand voltage. The number of high-voltage capacitors is basically 1
Individuals are fine. In contrast to these advantages, the present invention has a disadvantage that the output ripple frequency is the same as the operating frequency of the inverter 2 and is not doubled as in the prior art, and the ripple tends to increase.
As the operating frequency of the inverter is higher, the ripple can be reduced by the capacitance of the high-voltage cable 11, so that it does not become a big drawback. Further, as an embodiment of the present invention, it is possible to measure the tube current from the DC current flowing through the diode 19 that is grounded. In the practice of the present invention, if it is necessary to further reduce the high-frequency ripple voltage of the X-ray tube voltage,
It is also possible to add a capacitor having a capacitance relatively small to the capacitance of the high-voltage cable to the output terminal. In the experiment, a 20kHz high-frequency inverter, a transformer generating a secondary winding voltage of about 25kV, a booster capacitor of 1000pF30kV, and two high-voltage diodes with a withstand voltage of 60kV were used to output a tube voltage of 50kV and a tube current of 100mA. With 4m high voltage cables (1000pF each), sufficient practical output characteristics could be obtained.
また本発明はカソード接地されたＸ線管に対しては，
ダイオード18,19の極性を逆にすることにより正極出力
の電源として対応できる。The present invention also relates to a cathode grounded X-ray tube.
By reversing the polarities of the diodes 18 and 19, it can be used as a power supply having a positive output.
以上説明したように，本発明によれば，高圧ケーブル
の静電容量を利用して倍電圧整流回路を構成しているの
で，高圧トランスの２次巻線の高耐圧絶縁ボビンが不要
となり，また高圧コンデンサが基本的に１個で済む等の
経済的効果，技術的効果が大きい。As described above, according to the present invention, since the voltage doubler rectifier circuit is configured using the capacitance of the high voltage cable, the high voltage insulating bobbin of the secondary winding of the high voltage transformer is not required. The economical and technical effects such as basically requiring only one high-voltage capacitor are great.
第１図乃至第３図は本発明の一実施例を説明するための
図，第４図及び第５図は従来例を説明するための図であ
る。 １……直流電源、２……高周波インバータ ３……高圧トランス、５……高圧タンク 11……高圧ケーブル、12……Ｘ線管 14……管電流検出回路、17……コンデンサ 20……鉄心、18〜19……ダイオード 21……高圧ケーブル11の静電容量1 to 3 are diagrams for explaining one embodiment of the present invention, and FIGS. 4 and 5 are diagrams for explaining a conventional example. 1 DC power supply 2 High frequency inverter 3 High voltage transformer 5 High voltage tank 11 High voltage cable 12 X-ray tube 14 Tube current detection circuit 17 Capacitor 20 Iron core , 18-19: Diode 21: Capacitance of high voltage cable 11
Claims (1)
の中にそれぞれ収容された高圧トランスと第１のダイオ
ードと第２のダイオードと、芯導線と外被導体とを有す
る高圧ケーブルと、コンデンサとからなり、アノード又
はカソードを接地したＸ線管に正又は負の高電圧を供給
するＸ線電源装置であって、 前記高圧トランスの一次巻線を前記高周波インバータに
接続し、前記高圧トランスの二次巻線の一端を接地し、 前記第１のダイオードと前記第２のダイオードとを直列
接続して、この接続点を前記コンデンサを介して前記高
圧トランスの二次巻線の他の一端に接続し、前記第２の
ダイオードの他端を接地し、 前記第１のダイオードの他端を前記高圧ケーブルの芯導
線の一端に接続し、前記高圧ケーブルの外被導体を前記
接地した高圧タンクに接続し、 前記高圧ケーブルの芯導線の他の一端を前記Ｘ線管用出
力端子としてなることを特徴とするＸ線電源装置。1. A high-frequency inverter, a high-voltage transformer respectively housed in a grounded high-pressure tank, a first diode and a second diode, a high-voltage cable having a core conductor and a jacket conductor, and a capacitor. An X-ray power supply for supplying a positive or negative high voltage to an X-ray tube having an anode or a cathode grounded, comprising: connecting a primary winding of the high-voltage transformer to the high-frequency inverter; One end of the winding is grounded, the first diode and the second diode are connected in series, and this connection point is connected to the other end of the secondary winding of the high voltage transformer via the capacitor. The other end of the second diode is grounded, the other end of the first diode is connected to one end of a core conductor of the high-voltage cable, and the high-voltage cable is grounded at a high voltage. Connected to link, X-rays source device characterized by comprising the other end of the core wire of the high voltage cable as the output terminal for the X-ray tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26111090A JP2814016B2 (en) | 1990-09-28 | 1990-09-28 | X-ray power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26111090A JP2814016B2 (en) | 1990-09-28 | 1990-09-28 | X-ray power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04138700A JPH04138700A (en) | 1992-05-13 |
| JP2814016B2 true JP2814016B2 (en) | 1998-10-22 |
Family
ID=17357228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26111090A Expired - Fee Related JP2814016B2 (en) | 1990-09-28 | 1990-09-28 | X-ray power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2814016B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004103033A1 (en) * | 2003-05-15 | 2004-11-25 | Hitachi Medical Corporation | X-ray generation device |
-
1990
- 1990-09-28 JP JP26111090A patent/JP2814016B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04138700A (en) | 1992-05-13 |
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