JPS6226518A

JPS6226518A - Power supply voltage regulator

Info

Publication number: JPS6226518A
Application number: JP16550285A
Authority: JP
Inventors: Hitoshi Yamada; 均山田; Toru Shimizu; 徹清水
Original assignee: Yokogawa Medical Systems Ltd
Current assignee: GE Healthcare Japan Corp
Priority date: 1985-07-26
Filing date: 1985-07-26
Publication date: 1987-02-04

Abstract

PURPOSE:To make resetting of a set voltage unnecessary by deriving an absolute value of a potential difference between a power supply voltage applied terminal of a sliding transformer and a slider, adding it to a set voltage of a set voltage generator and using it as a reference value. CONSTITUTION:A commercial power supply voltage which is applied to input terminals 1, 2 of a sliding transformer 10 is regulated to a voltage corresponding to a position of a slider 11, and applied to the primary side of a high voltage transformer 22 through a load intermitting switch 20. An output voltage of this transformer 10 is detected by a detector 12 and inputted to a servo-amplifier 14, a control signal based on a difference to a reference value is obtained, and the position of the slider 11 is adjusted by a servo-motor 18. In this regard, said reference value is applied from an adder 24 by a set voltage generator 26 and a detecting transformer 30. In such a way, the output voltage of the detecting transformer 30 is rectified and smoothed 28, and it is multiplied by a suitable coefficient and added to a set voltage of the set voltage generator 26, by which irrespective of the position of the slider 11, a prescribed load time output voltage can be obtained.

Description

【発明の詳細な説明】（産業上の利用分野）本発明は、例えばＸ線発生装置用電源のように、比較的
大きな負荷の断続が行われる電源の電圧調整ＩＩＩに関
する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to voltage regulation III of a power supply in which a relatively large load is switched on and off, such as a power supply for an X-ray generator.

（従来の技術）Ｘａ発生装置の電源の高圧トランスの一次側には、商用
電源電圧を安定化した交流電圧が与えられる。商用電源
電圧の安定化は、摺動変圧器と、その摺動子の位置を制
御するサーボ機構を利用して行われる。サーボ機構には
、摺動変圧器の出力電圧の％単４を定める設定電圧が与
えられ、この設定電圧に基づいて、サーボ機構は、商用
電源電圧の変動に拘わらず摺動変圧器の出力電圧が一定
になるように摺動子の位置を制御する。その場合、Ｘ線
発生装置は比較的大きな負荷なので、Ｘ線発生器をオン
にした負荷状態では、摺動変圧器の出力インビー”ダン
スによる出力電圧の低下が無視できない。そこで、設定
電圧は、負荷状態において出力電圧が所望の値になるよ
うに、摺動変圧器の出力インピーダンスによる電圧低下
分を見込んだ値に定められる。(Prior Art) An alternating current voltage, which is a stabilized commercial power supply voltage, is applied to the primary side of a high-voltage transformer of a power source for an Xa generator. Stabilization of the commercial power supply voltage is performed using a sliding transformer and a servo mechanism that controls the position of the slider. The servomechanism is given a set voltage that determines the percentage of the output voltage of the sliding transformer, and based on this set voltage, the servomechanism adjusts the output voltage of the sliding transformer regardless of fluctuations in the commercial power supply voltage. The position of the slider is controlled so that the In that case, the X-ray generator is a relatively large load, so when the X-ray generator is turned on and the load is on, the output voltage drop due to the output impedance of the sliding transformer cannot be ignored. Therefore, the set voltage is The value is set to take into account the voltage drop due to the output impedance of the sliding transformer so that the output voltage becomes a desired value in a loaded state.

（発明が解決しようとする問題点）設定電圧は、摺動変圧器の゛出力インピーダンスを一定
とみて、それによる電圧低下分を見込むが、摺動変圧器
の出力インピーダンスは、摺動子の位置によって変化す
るので、商用電源電圧の変動に応じ゛て摺動変圧器の摺
動子の位置が移動すると、電圧低下量は、見込みの値と
ずれてきて、負荷状態での摺動変圧器の出力電圧に誤差
が生じる。出力電圧の誤差を許容範囲に収めるためには
、商用電源電圧変動の許容範囲を狭くしたり、出力電圧
の設定値を商用電源電圧の変動に合せて再設定すること
が必要になる。このような事情は、Ｘ線発生装置用電源
に限らず、大きな負荷がオンオフされる電源装置におい
て共通する問題である。(Problem to be solved by the invention) The set voltage assumes that the output impedance of the sliding transformer is constant and takes into account the voltage drop caused by it, but the output impedance of the sliding transformer depends on the position of the slider. Therefore, if the position of the slider of a sliding transformer moves in response to fluctuations in the commercial power supply voltage, the amount of voltage drop will deviate from the expected value, and the voltage drop of the sliding transformer under load will change. An error occurs in the output voltage. In order to keep the error in the output voltage within a permissible range, it is necessary to narrow the permissible range of commercial power supply voltage fluctuations or to reset the set value of the output voltage in accordance with the fluctuations in the commercial power supply voltage. This situation is a common problem not only in power supplies for X-ray generators but also in power supply devices in which a large load is turned on and off.

本発明はこのような問題点に鑑みてなされたもので、そ
の目的は、負荷状態での摺動変圧器の出力電圧を、摺動
子の位置の変化に拘わらず一定にする電源電圧調整装置
を提供することにある。The present invention was made in view of these problems, and its purpose is to provide a power supply voltage regulator that maintains the output voltage of a sliding transformer under load, regardless of changes in the position of the slider. Our goal is to provide the following.

（問題点を解決するための手段）上記問題点を解決する本発明は、可動の摺動子を有し、
一次側に与えられた交流電圧の値を摺動子の位置に応じ
て変化させた二次側電圧を出力する摺動変圧器と、この
摺動変圧器の出力電圧の基準値を定める設定電圧を発生
する設定電圧発生器と、この設定電圧発生器の設定電圧
によって定まる制御の基準値と前記摺動変圧器の出力電
圧との差に基づいて前記摺動変圧器の摺動子の位置を制
御するサーボ機構とを有する電源電圧調整装置において
、摺動変圧器の電ｍ電圧印加端子と摺動子の間の電位差
の絶対値を求める電圧検出手段と、この電圧検出手段の
出力電圧を設定電圧発生器の設定電圧に加算しこの加算
結果を制御の基準値としてサーボ機構に与える加算器と
を具備することを特徴とするものである。(Means for solving the problems) The present invention for solving the above problems has a movable slider,
A sliding transformer that outputs a secondary voltage that changes the value of the AC voltage applied to the primary side according to the position of the slider, and a set voltage that determines the reference value of the output voltage of this sliding transformer. a set voltage generator that generates the set voltage, and a position of the slider of the sliding transformer based on the difference between the control reference value determined by the set voltage of the set voltage generator and the output voltage of the sliding transformer. In a power supply voltage regulator having a servo mechanism to control, a voltage detection means for determining the absolute value of a potential difference between a voltage application terminal of a sliding transformer and a slider, and an output voltage of this voltage detection means is set. The present invention is characterized by comprising an adder that adds the voltage to the set voltage of the voltage generator and provides the result of the addition to the servo mechanism as a reference value for control.

（実施例）以下、図面を参照して本発明の実施例を詳細に説明する
。(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

本発明実施例の電気的接続図を第１図に示す。An electrical connection diagram of an embodiment of the present invention is shown in FIG.

第１図において、摺動変圧器１０の入力端子１゜２に供
給された商用電源電圧は、摺動子１１の位置に対応した
電圧に調整されて、負荷断続用のスイッチ２０を通じて
、例えば高圧トランス２２の一次側に供給される。摺動
変圧器１０の出力電圧は、出力電圧検出器１２によって
検出され、サーボアンプ１４の一方の入力端子に入力さ
れる。サーボアンプ１４の他方の入力端子には、後述の
制御の基準値が与えられる。サーボアンプ１４は、これ
ら２つの入力の差に基づく制御信号を出力してスイッチ
１６を通じてサーボモータ１８に与え、サーボモータ１
８に摺動子１１の位置を調整させる。スイッチ１６は、
摺動変圧器１０に負荷が接続されるときはオフにされ、
サーボループがオーブンにされる。In FIG. 1, the commercial power supply voltage supplied to the input terminals 1 and 2 of the sliding transformer 10 is adjusted to a voltage corresponding to the position of the slider 11, and then passed through the load intermittent switch 20, for example, to a high voltage. It is supplied to the primary side of the transformer 22. The output voltage of the sliding transformer 10 is detected by an output voltage detector 12 and input to one input terminal of a servo amplifier 14. The other input terminal of the servo amplifier 14 is given a reference value for control, which will be described later. The servo amplifier 14 outputs a control signal based on the difference between these two inputs and applies it to the servo motor 18 through the switch 16.
8 to adjust the position of the slider 11. The switch 16 is
When a load is connected to the sliding transformer 10, it is turned off;
The servo loop is put into the oven.

制御の基準値は、加算器２４から与えられる。The control reference value is given from the adder 24.

加算器２４には、設定電圧発生器２６の出力電圧が一方
の入力信号として与えられる。加算器２４の他方の入力
信号として１よ、検出トランス３０によって検出された
摺動変圧器１０の入力端子１と摺動子１１の間の電位差
が、整流平滑回路２８を通じて与えられる。加算器２４
は、これら２つの入力信号の和を制御の基準値としてサ
ーボアンプ１４に与える。The output voltage of the set voltage generator 26 is applied to the adder 24 as one input signal. As the other input signal of the adder 24, the potential difference between the input terminal 1 of the sliding transformer 10 and the slider 11 detected by the detection transformer 30 is given through the rectifying and smoothing circuit 28. Adder 24
gives the sum of these two input signals to the servo amplifier 14 as a reference value for control.

摺動変圧器１０の出力インピーダンスは、摺動子１１の
位置によって第２図のグラフのように変化する。第２図
において、破線の位置が入力端子１に一致する摺動子１
１の位置であるが、このように、摺動子１１が入力端子
１１の位置の近くにあるときは、そこから上又は下のい
ずれに動いても、出力インピーダンスが増加する。この
ような出力インピーダンスの特性があるために、無負荷
時の出力電圧が一定になるように制御したときは、摺動
変圧器１０の負荷時の出力電圧は、第３図のように変化
する。即ち、摺動子１１が入力端子１近くにあるときは
、そこから上又は下のいずれに移動しても出力電圧の低
下聞が増加する。このような負荷時の出力電圧の低下を
防ぐためには、無負荷時の出力電圧を、第４図のように
摺動子１１の位置に応じて、負荷出力電圧の低下に見合
った分だけ増加するようにすればよい。The output impedance of the sliding transformer 10 changes depending on the position of the slider 11 as shown in the graph of FIG. In Fig. 2, the position of the broken line corresponds to the slider 1 that corresponds to the input terminal 1.
In this way, when the slider 11 is near the position of the input terminal 11, the output impedance increases regardless of whether it moves upward or downward from there. Due to such output impedance characteristics, when the output voltage at no load is controlled to be constant, the output voltage at load of the sliding transformer 10 changes as shown in Fig. 3. . That is, when the slider 11 is near the input terminal 1, the amount of decrease in the output voltage increases regardless of whether the slider 11 is moved upward or downward from there. In order to prevent such a drop in the output voltage under load, the output voltage under no load must be increased by an amount commensurate with the drop in the load output voltage, depending on the position of the slider 11, as shown in Figure 4. Just do it.

第１図の実施例において、摺動変圧器１０の入力端子１
と摺動子１１の間の電位差の絶対値は、摺動子１１の位
置が入力端子１の位置に一致するときに零となるが、摺
動子１１がそれよりも上又は下のどちらに動いても値が
増え、これを図示すれば第５図のグラフのようになる。In the embodiment of FIG. 1, the input terminal 1 of the sliding transformer 10
The absolute value of the potential difference between the slider 11 and the slider 11 becomes zero when the position of the slider 11 matches the position of the input terminal 1, but whether the slider 11 is located above or below it. Even if it moves, the value increases, and if this is illustrated, it will look like the graph in Figure 5.

従って、検出トランス３０の出力電圧を整流平滑する回
路２８の出力電圧も、同グラフのようになり、これを加
算器２４において、その入力回路に設けた係数用抵抗２
５によって適当な係数を掛けて、設定電圧発生器２６の
設定電圧に加算すると、第４図のグラフのような無負荷
出力電圧を発生させるための制御の基準値を得ることが
できる。このような基準値に基づいて摺動変圧器１０の
出力電圧を制御すれば、摺動子１１の位置に拘わらず一
定な負荷時出力電圧が得られるので、設定電圧の再設定
が不用で、商用電源電圧の変動に対する許容範囲の広い
電源電圧調整装置が実現できる。Therefore, the output voltage of the circuit 28 for rectifying and smoothing the output voltage of the detection transformer 30 will also be as shown in the same graph, and this will be applied to the coefficient resistor 2 provided in the input circuit of the adder 24.
By multiplying by an appropriate coefficient by 5 and adding it to the set voltage of the set voltage generator 26, a reference value for control for generating a no-load output voltage as shown in the graph of FIG. 4 can be obtained. If the output voltage of the sliding transformer 10 is controlled based on such a reference value, a constant output voltage under load can be obtained regardless of the position of the slider 11, so there is no need to reset the set voltage. A power supply voltage regulator with a wide tolerance range for fluctuations in commercial power supply voltage can be realized.

この電圧調整装置をＸ線管の管電圧供給に適用する場合
で、×１９管の管電流の設定が幾通りかあるときは、加
算器２４の係数用抵抗２５の値を管電流に応じて切換え
るようにしてもよい。管電流が幾通りか定められている
ときは、それに応じた高圧トランス２２の一次側電圧を
与えるために、設定電圧発生器２６の電圧が切換えられ
るので、その切換えに連動して係数用抵抗２５の切換え
を行うようにしてもよい。When this voltage regulator is applied to the tube voltage supply of an X-ray tube and there are several settings for the tube current of the It may be possible to switch. When several tube currents are determined, the voltage of the set voltage generator 26 is switched in order to provide the primary side voltage of the high voltage transformer 22 corresponding to the tube current, so the coefficient resistor 25 is switched in conjunction with the switching. Alternatively, the switching may be performed.

（発明の効果）以上説明したように、本発明によれば、負荷状態での摺
動変圧器の出力電圧を、摺動子の位置の変化に拘わらず
一定にする電源電圧調整装置が得られる。(Effects of the Invention) As explained above, according to the present invention, a power supply voltage regulator can be obtained that keeps the output voltage of a sliding transformer constant in a loaded state regardless of changes in the position of the slider. .

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明実施例の電気的構成図、第２図乃至第５
図は第１図の実施例の動作を説明するためのグラフであ
る。１０・・・摺動変圧器　　　１１・・・摺動子１２・・
・出力電圧検出器　１４・・・サーボアンプ１６・・・
スイッチ　　　　１８・・・サーボモータ２０・・・負
荷オンオフ用スイッチ２２・・・高圧トランス　　２４・・・加算回路２５・
・・係数用抵抗　　　２６・・・設定電圧発生器２８・
・・整流平滑回路　　３０・・・検出トランス特許出願
人　横河メディカルシステム株式会社第１図ンＵ；真荷オンオフ用スイッチ第２図第４図摺動子の位置第３図摺動子の歯璽第５図ｍｗの位１FIG. 1 is an electrical configuration diagram of an embodiment of the present invention, and FIGS.
The figure is a graph for explaining the operation of the embodiment shown in FIG. 10...Sliding transformer 11...Slider 12...
・Output voltage detector 14... Servo amplifier 16...
Switch 18... Servo motor 20... Load on/off switch 22... High voltage transformer 24... Addition circuit 25...
・Resistance for coefficient 26 ・Setting voltage generator 28 ・
... Rectification and smoothing circuit 30 ... Detection transformer Patent applicant Yokogawa Medical Systems Co., Ltd. Fig. 1 U; True load on/off switch Fig. 2 Fig. 4 Position of slider Fig. 3 Teeth of slider Seal Figure 5 mw digit 1

Claims

【特許請求の範囲】[Claims]

可動の摺動子を有し、一次側に与えられた交流電圧の値
を摺動子の位置に応じて変化させた二次側電圧を出力す
る摺動変圧器と、この摺動変圧器の出力電圧の基準値を
定める設定電圧を発生する設定電圧発生器と、この設定
電圧発生器の設定電圧によつて定まる制御の基準値と前
記摺動変圧器の出力電圧との差に基づいて前記摺動変圧
器の摺動子の位置を制御するサーボ機構とを有する電源
電圧調整装置において、摺動変圧器の電源電圧印加端子
と摺動子の間の電位差の絶対値を求める電圧検出手段と
、この電圧検出手段の出力電圧を設定電圧発生器の設定
電圧に加算しこの加算結果を制御の基準値としてサーボ
機構に与える加算器とを具備する電源電圧調整装置。A sliding transformer that has a movable slider and outputs a secondary voltage that changes the value of the AC voltage applied to the primary side according to the position of the slider; a set voltage generator that generates a set voltage that determines a reference value of the output voltage; and a set voltage generator that generates a set voltage that determines the reference value of the output voltage; In a power supply voltage regulating device having a servo mechanism for controlling the position of a slider of a sliding transformer, a voltage detection means for determining the absolute value of the potential difference between a power supply voltage application terminal of the sliding transformer and the slider; , and an adder that adds the output voltage of the voltage detection means to the set voltage of the set voltage generator and supplies the addition result to the servo mechanism as a reference value for control.