JP2741297B2 - Powerless converter - Google Patents
Powerless converterInfo
- Publication number
- JP2741297B2 JP2741297B2 JP964892A JP964892A JP2741297B2 JP 2741297 B2 JP2741297 B2 JP 2741297B2 JP 964892 A JP964892 A JP 964892A JP 964892 A JP964892 A JP 964892A JP 2741297 B2 JP2741297 B2 JP 2741297B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- differential amplifier
- input current
- switch
- input
- 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 - Lifetime
Links
Landscapes
- Transmission And Conversion Of Sensor Element Output (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
- Control Of Voltage And Current In General (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は電源を備えず、入力電
流で電源電圧を発生させて動作させ、その入力電流を空
気圧出力、電圧出力などに信号変換して出力する無電源
変換器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powerless converter which does not have a power supply, operates by generating a power supply voltage with an input current, converts the input current into a pneumatic output, a voltage output, and the like, and outputs the signal.
【０００２】[0002]
【従来の技術】図３に従来の無電源変換器の一例を示
す。入力端子１１及び１２間にツェナーダイオード１３
及び抵抗器１４の直列回路が接続され、ツェナーダイオ
ード１３及び抵抗器１４の接続点は接地される。入力端
子１１及び１２間に入力電流Ｉｉが入力されると、ツェ
ナーダイオード１３及び抵抗器１４に入力電流Ｉｉが流
れ、ツェナーダイオード１３の両端間に一定の電源電圧
Ｖｃｃが発生し、この電源電圧Ｖｃｃは差動増幅器（通
常演算増幅器）１５の電源端子に印加されて差動増幅器
１５が動作状態になる。電源電圧Ｖｃｃはこの無電源変
換器の他の部分にも動作電源電圧として印加される。2. Description of the Related Art FIG. 3 shows an example of a conventional powerless converter. Zener diode 13 between input terminals 11 and 12
And the series circuit of the resistor 14 is connected, and the connection point of the Zener diode 13 and the resistor 14 is grounded. When the input current Ii is input between the input terminals 11 and 12, the input current Ii flows through the Zener diode 13 and the resistor 14, and a constant power supply voltage Vcc is generated between both ends of the Zener diode 13. Is applied to the power supply terminal of the differential amplifier (normal operational amplifier) 15, and the differential amplifier 15 enters an operating state. The power supply voltage Vcc is also applied as an operating power supply voltage to other parts of the converter.
【０００３】抵抗器１４に発生する降下電圧Ｖｉは入力
電流Ｉｉを電圧変換したものであり、入力電圧Ｖｉと記
す。この入力電圧Ｖｉが差動増幅器１５の一方の入力側
へ供給される。差動増幅器１５の出力は変換部１６へ供
給され、変換部１６の出力と対応した電気的帰還電圧Ｖ
ｆが差動増幅器１５の他方の入力側へ供給され、差動増
幅器１５の両入力が等しくなるように動作して変換部１
６から入力電流Ｉｉと対応した変換信号が出力される。The voltage drop Vi generated in the resistor 14 is obtained by converting the input current Ii into a voltage, and is referred to as an input voltage Vi. This input voltage Vi is supplied to one input side of the differential amplifier 15. The output of the differential amplifier 15 is supplied to the conversion unit 16, and the electrical feedback voltage V corresponding to the output of the conversion unit 16
f is supplied to the other input side of the differential amplifier 15 and operates so that both inputs of the differential amplifier 15 are equal to each other.
6 outputs a conversion signal corresponding to the input current Ii.
【０００４】この例では入力電流Ｉｉを空気圧信号に変
換する場合であって、差動増幅器１５の出力は電磁フラ
ッパユニット１７のコイル１８へ供給される。コイル１
８に電流が流れることにもとづき発生した磁力によりノ
ズル１９と、これと対向するフラッパ２１との間隙が狭
くなり、端子（流入口）２２より絞り２３を介してノズ
ル１９へ空気圧が供給されており、ノズル１９の背圧Ｐ
ｐが前記間隙が狭くなって大となり、その背圧Ｐｐがパ
イロットバルブ２４で増幅され、空気圧出力Ｐｏとして
出力端子（流出口）２５へ流出されると共に一部は空電
変換器２６で電気信号に変換され、この電気信号が帰還
電圧Ｖｆとして差動増幅器１５へ負帰還される。この結
果、入力電流Ｉｉと対応した空気圧出力Ｐｏが得られ
る。In this example, the input current Ii is converted into a pneumatic signal, and the output of the differential amplifier 15 is supplied to a coil 18 of an electromagnetic flapper unit 17. Coil 1
The gap between the nozzle 19 and the flapper 21 facing the nozzle 19 is narrowed by the magnetic force generated based on the current flowing through the nozzle 8, and air pressure is supplied to the nozzle 19 from the terminal (inflow port) 22 through the throttle 23. , Back pressure P of nozzle 19
The back pressure Pp is amplified by the pilot valve 24 and flows out as an air pressure output Po to an output terminal (outflow port) 25 and a part of the electric signal p is output by the aeroelectric converter 26. The electric signal is negatively fed back to the differential amplifier 15 as a feedback voltage Vf. As a result, an air pressure output Po corresponding to the input current Ii is obtained.
【０００５】[0005]
【発明が解決しようとする課題】無電源変換器では上述
したように入力電流Ｉｉから動作電源電圧Ｖｃｃを作る
ため、入力電流Ｉｉが小さい場合は、電源電圧Ｖｃｃが
規定電圧より低くなり、差動増幅器１５の動作が不安定
になり、変換出力（この例では空気圧出力Ｐｏ）も不安
定になる。In the non-power converter, as described above, the operating power supply voltage Vcc is produced from the input current Ii. Therefore, when the input current Ii is small, the power supply voltage Vcc becomes lower than the specified voltage, and The operation of the amplifier 15 becomes unstable, and the converted output (pneumatic output Po in this example) also becomes unstable.
【０００６】また入力電流Ｉｉが入力された過渡期に、
空気圧出力Ｐｏがオーバーシュートするなどの不都合が
生じることがあった。このような問題を解決するため、
実開平１−９３５１３号の明細書に示すように、ツェナ
ーダイオード１３の両端間に得られる電源電圧Ｖｃｃが
所定値以下の場合は、フラッパユニット１７への供給信
号として、差動増幅器１５の出力に代えて一定値を与え
るものが提案されている。しかし、この場合は、帰還信
号Ｖｆが、入力電流Ｉｉに見合ったものでないため、差
動増幅器１５の両入力は等しくならず、差動増幅器１５
の作用でその出力がどんどん増加して、最大値になり、
つまり飽和してしまう。このため、入力電流Ｉｉが所定
値以上になって、フラッパユニット１７の駆動が一定値
から差動増幅器１５の出力に切替えられた時に、瞬間的
に、それまでの差動増幅器１５の最大値出力がフラッパ
ユニット１７へ供給され、瞬時的に、空気圧出力Ｐｏが
出力レンジを越えるおそれがある。In a transition period when the input current Ii is input,
Problems such as overshoot of the air pressure output Po sometimes occurred. To solve these problems,
As shown in the specification of Japanese Utility Model Application Laid-Open No. 1-93513, when the power supply voltage Vcc obtained between both ends of the Zener diode 13 is equal to or lower than a predetermined value, the output signal of the differential amplifier 15 is supplied to the flapper unit 17 as a signal. Instead, a device giving a constant value has been proposed. However, in this case, since the feedback signal Vf does not match the input current Ii, the two inputs of the differential amplifier 15 are not equal, and the differential amplifier 15
The output increases and reaches its maximum value.
That is, it saturates. Therefore, when the input current Ii exceeds a predetermined value and the driving of the flapper unit 17 is switched from the constant value to the output of the differential amplifier 15, the maximum output of the Is supplied to the flapper unit 17, and the air pressure output Po may momentarily exceed the output range.
【０００７】[0007]
【課題を解決するための手段】請求項１の発明によれ
ば、差動増幅器の電源端子と直列にスイッチが挿入さ
れ、入力電流により発生した電源電圧が所定値以下では
上記スイッチはオフとされ、所定値以上でスイッチはオ
ンにされて差動増幅器が動作状態とされる。請求項２の
発明によれば、入力電流により発生した電源電圧がダミ
ー電圧発生回路に供給されて、変換出力の最小値または
それを僅かに上回る値に対応した入力電流の変換電圧
（入力電圧）と等しいダミー電圧が発生され、入力電流
の変換電圧とダミー電圧とが切替えスイッチで切替えら
れて差動増幅器へ供給されるようにされ、入力電流が所
定値以下ではダミー電圧が差動増幅器へ供給され、所定
値以上では入力電流の変換電圧が差動増幅器へ供給され
るように切替えスイッチが制御される。According to the first aspect of the present invention, a switch is inserted in series with the power supply terminal of the differential amplifier, and the switch is turned off when the power supply voltage generated by the input current is lower than a predetermined value. When the value exceeds a predetermined value, the switch is turned on, and the differential amplifier is brought into an operating state. According to the second aspect of the present invention, the power supply voltage generated by the input current is supplied to the dummy voltage generating circuit, and the converted voltage (input voltage) of the input current corresponding to the minimum value of the conversion output or a value slightly higher than the minimum value And a converted voltage of the input current and a dummy voltage are switched by a changeover switch and supplied to the differential amplifier. When the input current is equal to or less than a predetermined value, the dummy voltage is supplied to the differential amplifier. When the value is equal to or larger than the predetermined value, the changeover switch is controlled so that the converted voltage of the input current is supplied to the differential amplifier.
【０００８】請求項３の発明によれば、請求項１の発明
と請求項２の発明とが組合わされ、入力電流Ｉｉが減少
して正常範囲の下限値を僅かに切った時点で、差動増幅
器１５の入力を入力電流Ｉｉの変換電圧Ｖｉからダミー
電圧Ｖｄに切り替え、この状態から入力電流Ｉｉが更に
減少すると直列スィッチ２８をオフにして差動増幅器１
５を不動作にする。そして入力電流Ｉｉが増加に転じて
所定値に達すると差動増幅器１５の入力を再びダミー電
圧Ｖｄから入力電流の変換電圧Ｖｉに切り替えるが、差
動増幅器１５が不動作とされた状態で入力電流Ｉｉが増
加に転じた場合は、先ず直列スイッチがオンとされて発
生電源電圧が差動増幅器の電源端子へ供給された後、切
替えスイッチが入力電流の変換電圧（入力電圧）を差動
増幅器へ供給するようにされる。According to the third aspect of the present invention, the first and second aspects of the present invention are combined to reduce the input current Ii.
And a little below the lower limit of the normal range.
Input from the converter 15 from the converted voltage Vi of the input current Ii.
The voltage is switched to the voltage Vd, and from this state, the input current Ii further increases.
When it decreases, the series switch 28 is turned off and the differential amplifier 1
5 is disabled. And the input current Ii starts to increase
When a predetermined value is reached, the input of the differential amplifier 15 is again
The voltage Vd is switched to the input current conversion voltage Vi,
The input current Ii increases in a state where the operational amplifier 15 is inoperative.
In the case of addition, the series switch is first turned on and the generated power supply voltage is supplied to the power supply terminal of the differential amplifier, and then the changeover switch supplies the converted voltage (input voltage) of the input current to the differential amplifier. To be.
【０００９】[0009]
【実施例】図１に請求項１及び２の各発明を含む実施例
を示し、図３と対応する部分に同一符号を付けてある。
この発明では入力端子１１と差動増幅器１５の電源端子
との間にスイッチ２８が挿入される。スイッチ制御回路
２９は、入力電流Ｉｉにより発生された電源電圧Ｖｃｃ
が所定値、つまり差動増幅器１５が安定に動作可能な電
圧以上になるとスイッチ２８をオンにする。例えばスイ
ッチ２８としてｎｐｎトランジスタ３１が用いられ、ト
ランジスタ３１のコレクタが入力端子１１に接続され、
エミッタが差動増幅器１５の電源端子に接続される。ま
たスイッチ制御回路２９として入力端子１１が抵抗器３
２、３３の直列回路を通じて接地され、抵抗器３２、３
３の接続点がトランジスタ３１のベースに接続される。FIG. 1 shows an embodiment including each of the first and second aspects of the present invention, and portions corresponding to those in FIG. 3 are denoted by the same reference numerals.
In the present invention, the switch 28 is inserted between the input terminal 11 and the power supply terminal of the differential amplifier 15. The switch control circuit 29 supplies the power supply voltage Vcc generated by the input current Ii.
Is higher than a predetermined value, that is, a voltage at which the differential amplifier 15 can operate stably, the switch 28 is turned on. For example, an npn transistor 31 is used as the switch 28, the collector of the transistor 31 is connected to the input terminal 11,
The emitter is connected to the power supply terminal of the differential amplifier 15. Further, the input terminal 11 is connected to the resistor 3 as the switch control circuit 29.
Grounded through a series circuit of 2, 33, resistors 32, 3
3 is connected to the base of the transistor 31.
【００１０】入力電流Ｉｉにより発生された電源電圧Ｖ
ｃｃがダミー電圧発生回路３４に供給され、ダミー電圧
発生回路３４から、変換部１６の変換出力の最小値また
はそれを僅かに上回る値に対応した入力電流Ｉｉの変換
電圧（入力電圧）Ｖｉと等しいダミー電圧Ｖｄを発生す
る。差動増幅器１５の入力側と、入力端子１２及び抵抗
器１４の接続点との間に切替えスイッチ３５が挿入さ
れ、切替えスイッチ３５により入力電圧Ｖｉとダミー電
圧Ｖｄとを切替えて差動増幅器１５へ供給することがで
きるようにされる。The power supply voltage V generated by the input current Ii
cc is supplied to the dummy voltage generation circuit 34, and the dummy voltage generation circuit 34 equals the converted voltage (input voltage) Vi of the input current Ii corresponding to the minimum value of the conversion output of the conversion unit 16 or a value slightly higher than the minimum value. A dummy voltage Vd is generated. A changeover switch 35 is inserted between the input side of the differential amplifier 15 and the connection point between the input terminal 12 and the resistor 14, and switches between the input voltage Vi and the dummy voltage Vd by the changeover switch 35 to the differential amplifier 15. Will be able to supply.
【００１１】スイッチ制御回路３６に入力電圧Ｖｉが供
給され、スイッチ制御回路３６により、入力電圧Ｖｉ
（入力電流Ｉｉ）が所定値以下、つまり変換部１６が動
作しても電源電圧Ｖｃｃが安定に得られる最低値以下で
切替えスイッチ３５がダミー電圧Ｖｄを差動増幅器１５
へ供給し、入力電圧Ｖｉ（入力電流Ｉｉ）が所定値以上
で入力電圧Ｖｉを差動増幅器１５へ供給するように切替
え制御される。要するに、差動増幅器１５及び変換部１
６が、差動増幅器１５の入力と対応した出力を変換部１
６が出力することができる入力の最低値またはそれを僅
かに上回る値にダミー電圧Ｖｄを設定する。An input voltage Vi is supplied to the switch control circuit 36, and the input voltage Vi is supplied to the switch control circuit 36.
When the (input current Ii) is equal to or less than a predetermined value, that is, equal to or less than the minimum value at which the power supply voltage Vcc can be stably obtained even when the converter 16 operates, the changeover switch 35 applies the dummy voltage Vd to the differential amplifier 15.
The input voltage Vi (input current Ii) is controlled to switch to supply the input voltage Vi to the differential amplifier 15 when the input voltage Vi is equal to or higher than a predetermined value. In short, the differential amplifier 15 and the converter 1
6 converts the output corresponding to the input of the differential amplifier 15 to the conversion unit 1
6 sets the dummy voltage Vd to the minimum value of the input that can be output or a value slightly higher than the minimum value.
【００１２】ダミー電圧発生回路３４、切替えスイッチ
３５及びスイッチ制御回路３６の具体例を図２に示す。
ダミー電圧発生回路３４は電源電圧Ｖｃｃが極性反転回
路３７で−Ｖｃｃとされ、その−Ｖｃｃが分圧回路３８
で分圧されてダミー電圧Ｖｄとされる。また−Ｖｃｃが
分圧回路４０で分圧されて切替電圧Ｖｔとされる。スイ
ッチ制御回路３６は入力電圧Ｖｉと切替電圧Ｖｔとを比
較器３９で比較し、比較器３９の出力で切替えスイッチ
３５の一部を構成するＭＯＳ形のアナログスイッチ３５
ａをオンオフ制御し、比較器３９の出力をインバータ４
１を通じて切替えスイッチ３５の他部を構成するＭＯＳ
形アナログスイッチ３５ｂをオンオフ制御する。入力電
圧Ｖｉの絶対値が切替電圧Ｖｔの絶対値より小さいと、
スイッチ３５ａがオン、スイッチ３５ｂがオフに制御さ
れて、Ｖｄが差動増幅器１５へ供給され、｜Ｖｉ｜が｜
Ｖｔ｜より大であればスイッチ３５ａがオフ、スイッチ
３５ｂがオンに制御されてＶｉが差動増幅器１５へ供給
される。FIG. 2 shows a specific example of the dummy voltage generating circuit 34, the changeover switch 35, and the switch control circuit 36.
In the dummy voltage generating circuit 34, the power supply voltage Vcc is made -Vcc by the polarity inverting circuit 37, and the -Vcc is divided by the voltage dividing circuit 38.
Is divided into a dummy voltage Vd. Further, -Vcc is divided by the voltage dividing circuit 40 to be the switching voltage Vt. The switch control circuit 36 compares the input voltage Vi and the switching voltage Vt with a comparator 39, and the MOS analog switch 35 which forms a part of the switch 35 by the output of the comparator 39.
a, and outputs the output of the comparator 39 to the inverter 4
1 and the MOS constituting the other part of the changeover switch 35
The on / off control of the analog switch 35b is performed. When the absolute value of the input voltage Vi is smaller than the absolute value of the switching voltage Vt,
The switch 35a is turned on and the switch 35b is turned off, Vd is supplied to the differential amplifier 15, and | Vi |
If it is larger than Vt |, the switch 35a is turned off and the switch 35b is turned on, and Vi is supplied to the differential amplifier 15.
【００１３】スイッチ２８がオンになった後に、切替え
スイッチ３５がＶｄからＶｉに切替わるように、２９お
よび４０の各レベルが選定されている。上述の構成によ
れば、入力電流Ｉｉが小さく、電源電圧Ｖｃｃが所定値
以下で、差動増幅器１５が安定に動作しない状態では、
スイッチ２８がオフとなっていて、差動増幅器１５に電
源電圧が印加されず、不動作状態にあり、電源電圧Ｖｃ
ｃが所定値以上になるとスイッチ２８がオンとなり差動
増幅器１５に電源電圧Ｖｃｃが印加され、動作状態にな
る。このため電源電圧Ｖｃｃが低すぎることによる差動
増幅器１５の誤動作や、不安定な動作を防ぐことができ
る。Each of the levels 29 and 40 is selected so that the changeover switch 35 switches from Vd to Vi after the switch 28 is turned on. According to the above configuration, when the input current Ii is small, the power supply voltage Vcc is equal to or lower than the predetermined value, and the differential amplifier 15 does not operate stably,
Since the switch 28 is off, the power supply voltage is not applied to the differential amplifier 15,
When c becomes a predetermined value or more, the switch 28 is turned on, the power supply voltage Vcc is applied to the differential amplifier 15, and the differential amplifier 15 enters an operation state. Therefore, it is possible to prevent the differential amplifier 15 from malfunctioning and unstable operation due to the power supply voltage Vcc being too low.
【００１４】また電源電圧Ｖｃｃが所定値より低い状態
で無理に差動増幅器１５を動作させると、差動増幅器１
５の動作が不十分なため、空気圧出力Ｐｏが入力電流Ｉ
ｉに見合った値にならず、このため差動増幅器１５が更
に大きい電流を電磁フラッパユニット１７に供給しよう
とし、差動増幅器１５を経て電磁フラッパユニット１７
ヘ供給される電流が増加する。これにより入力電流Ｉｉ
の差動増幅器１５側に分流する量が多くなり、その分ツ
ェナーダイオード１３を流れる電流が減少し、その結果
所謂ツェナー電圧を得るのに必要な電流値以下になって
差動増幅器１５を駆動する電源電圧Ｖｃｃが更に低下し
て不安定となるが、この発明ではそのような問題点の解
消を図った。 When the differential amplifier 15 is forcibly operated while the power supply voltage Vcc is lower than a predetermined value , the differential amplifier 1
5 is insufficient, the air pressure output Po becomes the input current I
i, the differential amplifier 15 is not updated.
A large current to the electromagnetic flapper unit 17
And the electromagnetic flapper unit 17 through the differential amplifier 15
The supplied current increases. As a result, the input current Ii
Diverted to the differential amplifier 15 side of the
The current flowing through the Zener diode 13 decreases, and as a result,
When the current becomes less than the current required to obtain the so-called Zener voltage
The power supply voltage Vcc for driving the differential amplifier 15 further decreases.
The present invention solves such problems.
I tried to turn it off.
【００１５】例えば、入力電流の規定の範囲４〜２０mA
に対し出力が空気圧力0.２〜1.０kgf/cm2 となるような
電空変換器で、入力が3.５mA以上の場合のみ所定値以上
の電源電圧Ｖｃｃが確保可能で、これにより入力電流Ｉ
ｉに見合った空気圧出力Ｐｏを得ることが可能となり、
かつ構造上の制限で変換部１６の出力が0.０５kgf/cm2
（１mA入力相当）以下にならないような場合において、
Ｖｄを１mAをわずかに越える入力相当の値とし、Ｖｔを
3.５mA入力相当の値に設定する。For example, the specified range of the input current is 4 to 20 mA.
To output in such electropneumatic transducer the air pressure 0.2~1.0kgf / cm 2, when only the predetermined value or more inputs than 3.5mA
The power supply voltage Vcc can ensure thereby the input current I
It is possible to obtain an air pressure output Po corresponding to i,
In addition, the output of the conversion unit 16 is 0.05 kgf / cm 2 due to structural limitations.
(Equivalent to 1mA input)
Let Vd be a value equivalent to an input slightly exceeding 1 mA, and Vt be
Set to a value equivalent to 3.5 mA input.
【００１６】入力電流が3.５mA以下の場合は、Ｖｔ＞Ｖ
ｉとなり、スイッチ３５は、ダミー電圧発生回路３４側
となり、電磁フラッパユニット１７のコイル１８が消費
する電流は既知の最小値となって、入力電流Ｉｉの差動
増幅器１５側に分流する量も小さくなるため、ツェナー
ダイオード１３を流れる電流は所謂ツェナー電圧を得る
ための必要量が確保され、電源電圧Ｖｃｃは所定値（差
動増幅器１５が安定に動作するに必要とする最小電圧）
より低下することがなく、かつダミー電圧Ｖｄと出力の
帰還電圧Ｖｆが一致するので差動増幅器１５の出力が飽
和することがなく、つまり差動増幅器１５がそのときに
出力可能な最小値（０）又は最大値の電流を出力するこ
となく、正常に動作する。 When the input current is 3.5 mA or less, Vt> V
i, and the switch 35 becomes a dummy voltage generating circuit 34 side, the current coil 18 of the electromagnetic flapper unit 17 consumes I Do a known minimum value, the differential of the input current Ii
Since the amount diverted to the amplifier 15 side is also small, the Zener
The current flowing through the diode 13 obtains a so-called Zener voltage
Required amount is reserved for the power supply voltage Vcc is a predetermined value (minimum voltage differential amplifier 15 is required to operate stably)
The output of the differential amplifier 15 is not saturated because the dummy voltage Vd and the feedback voltage Vf of the output are the same.
Sum, that is, when the differential amplifier 15
Output the minimum (0) or maximum current that can be output.
Works normally.
【００１７】入力電流が3.５mAを越えると、切替えスイ
ッチ３５が入力端子１２側に切替わり入力電圧Ｖｉが差
動増幅器１５へ入力され、このとき、前述したように差
動増幅器の出力は飽和していないため、出力が直ちに、
かつレンジオーバーすることなく、入力電圧Ｖｉに対応
した変換出力Ｐｏが得られる。このように、入力電流Ｉ
ｉが所定値より僅かに低い場合には、差動増幅器１５の
入力として上記のダミー電圧Ｖｄを与えることにより変
換部１６の電磁フラッパユニット１７のコイル１８に流
れる電流は既知の最小値となってツェナーダイオード１
３を流れる電流の減少が抑制され、これにより電源電圧
Ｖｃｃが所定地区に確保でき、かつ入力電流Ｉｉが通常
の値になると、ダミー入力電圧から正常入力に切替わ
り、差動増幅器１５にとっては単に入力電流が変化した
場合と同様な状態となる。When the input current exceeds 3.5 mA, the changeover switch 35 is switched to the input terminal 12 and the input voltage Vi is input to the differential amplifier 15. At this time, the output of the differential amplifier is saturated as described above. to have because had such, output immediately,
Moreover, the converted output Po corresponding to the input voltage Vi can be obtained without over-range. Thus, the input current I
If i is slightly lower than the predetermined value, the differential amplifier 15
By applying the dummy voltage Vd as an input,
To the coil 18 of the electromagnetic flapper unit 17
The current flowing to the Zener diode 1
3 is suppressed, whereby the power supply voltage Vcc can be secured in a predetermined area, and when the input current Ii becomes a normal value, the dummy input voltage is switched to the normal input, and the differential amplifier 15 simply receives the input. A state similar to that when the input current changes is obtained.
【００１８】特に上述のように、スイッチ２８がオンに
なった後に、切替えスイッチ３５が切替わるようにして
いる場合は、ダミー電圧Ｖｄが差動増幅器１５に入力さ
れても、差動増幅器１５が動作する時は、電圧Ｖｄで安
定に動作するため、入力電流投入直後の過渡期や、入力
電流が非常に低い場合などから正常入力となっても、常
に正常に動作する。In particular, as described above, when the changeover switch 35 is switched after the switch 28 is turned on, even if the dummy voltage Vd is input to the differential amplifier 15, When operating, the device operates stably at the voltage Vd, so that the device always operates normally even in a transitional period immediately after the input current is supplied or when the input current becomes very low.
【００１９】なおスイッチ制御回路２９、３６にはそれ
ぞれ適当な遅延回路とヒステリシスとをもたせ、入力電
流Ｉｉが急速かつ頻繁に変動しても、スイッチ２８、切
替えスイッチ３５が敏感に動かないようにするとよい。
電磁フラッパユニット１７の代りに、圧電フラッパユニ
ットを用いてもよい。またこの発明は電気空気変換器の
みならず、電空ポジョナ、その他入力信号から電源電圧
を作り、かつその入力信号を他の信号に変換する電気電
気変換器にも適用できる。またスイッチ２８及びスイッ
チ制御回路２９を設け、入力端子１２を差動増幅器１５
の入力側に接続したままとし、ダミー電圧発生回路３
４、切替えスイッチ３５、スイッチ制御回路３６を省略
してもよい。逆に入力端子１１を差動増幅器１５の電源
端子に直接接続し、スイッチ２８、スイッチ制御回路２
９を省略し、ダミー電圧発生回路３４、切替えスイッチ
３５、スイッチ制御回路３６を設けてもよい。The switch control circuits 29 and 36 are each provided with an appropriate delay circuit and hysteresis so that the switch 28 and the changeover switch 35 do not move sensitively even if the input current Ii fluctuates rapidly and frequently. Good.
Instead of the electromagnetic flapper unit 17, a piezoelectric flapper unit may be used. The present invention can be applied not only to an electro-pneumatic converter but also to an electro-pneumatic poisoner and other electro-electric converters that generate a power supply voltage from an input signal and convert the input signal into another signal. Further, a switch 28 and a switch control circuit 29 are provided, and the input terminal 12 is connected to the differential amplifier 15.
Of the dummy voltage generating circuit 3
4. The changeover switch 35 and the switch control circuit 36 may be omitted. Conversely, the input terminal 11 is directly connected to the power supply terminal of the differential amplifier 15, and the switch 28, the switch control circuit 2
9 may be omitted, and a dummy voltage generating circuit 34, a changeover switch 35, and a switch control circuit 36 may be provided.
【００２０】[0020]
【発明の効果】以上述べたように、請求項１の発明によ
れば入力電流Ｉｉが非常に小さい場合は、差動増幅器１
５へ電源電圧Ｖｃｃが印加されないため、差動増幅器１
５が不安定に動作したり、飽和したり、誤った変換出力
が生じたりするおそれはない。請求項２の発明によれ
ば、入力電流が所定値以下では、変換出力の最低値付近
と対応したダミー電圧が差動増幅器へ供給され、従って
差動増幅器の出力によりそのダミー電圧と対応した変換
出力を出力することができ、ダミー電圧と一致した帰還
電圧が差動増幅器に入力されるため、入力電源が正常値
になると、変換出力がレンジオーバーすることなく、正
常な変換出力を出力することができる。As described above, according to the first aspect of the present invention, when the input current Ii is very small, the differential amplifier 1
5 is not supplied with the power supply voltage Vcc.
There is no danger of unstable operation, saturation, or erroneous conversion output. According to the second aspect of the present invention, when the input current is equal to or less than the predetermined value, a dummy voltage corresponding to the vicinity of the minimum value of the conversion output is supplied to the differential amplifier. Output can be output, and the feedback voltage that matches the dummy voltage is input to the differential amplifier, so that when the input power supply reaches a normal value, the conversion output can output a normal conversion output without over-range. Can be.
【図１】この発明の実施例を示すブロック図。FIG. 1 is a block diagram showing an embodiment of the present invention.
【図２】図１中のダミー電圧発生回路３４、切替えスイ
ッチ３５、スイッチ制御回路３６の具体例を示す図。FIG. 2 is a diagram showing a specific example of a dummy voltage generation circuit 34, a changeover switch 35, and a switch control circuit 36 in FIG.
【図３】従来の無電源変換器の一例を示すブロック図。FIG. 3 is a block diagram showing an example of a conventional powerless converter.
Claims (3)
動増幅器の電源端子へ印加してこれを動作状態にすると
共に、上記入力電流を電圧に変換して上記差動増幅器の
一方の入力側へ供給し、その差動増幅器の出力にもとづ
いた変換出力を得、その変換出力と対応した電気的帰還
信号を上記差動増幅器の他方の入力側に負帰還して、上
記入力電流と対応した変換出力を得る無電源変換器にお
いて、 上記差動増幅器の電源端子と直列に挿入されたスイッチ
と、 上記発生した電源電圧が所定値以上で上記スイッチをオ
ンにするスイッチ制御手段と、 を設けたことを特徴とする無電源変換器。1. A power supply voltage is generated from an input current, applied to a power supply terminal of a differential amplifier to make it operate, and the input current is converted into a voltage to convert one input of the differential amplifier. Side, and obtains a converted output based on the output of the differential amplifier, and provides an electrical feedback signal corresponding to the converted output to the other input side of the differential amplifier by negative feedback so as to correspond to the input current. A non-power converter for obtaining the converted output, comprising: a switch inserted in series with a power terminal of the differential amplifier; and switch control means for turning on the switch when the generated power voltage is equal to or higher than a predetermined value. A non-power converter.
動増幅器の電源端子へ印加してこれを動作状態にすると
共に、上記入力電流を電圧に変換して上記差動増幅器の
一方の入力側へ供給し、その差動増幅器の出力にもとづ
いた変換出力を得、その変換出力と対応した電気的帰還
信号を上記差動増幅器の他方の入力側に負帰還して、上
記入力電流と対応した変換出力を得る無電源変換器にお
いて、 上記発生した電源電圧が供給され、上記変換出力の最小
値またはそれを僅かに上回る値に対応した入力電流の変
換電圧と等しいダミー電圧を発生させる手段と、 上記入力電流の変換電圧と上記ダミー電圧とを切替えて
上記差動増幅器へ供給する切替えスイッチと、 上記入力電流が所定値以下で上記ダミー電圧を、所定値
以上で上記入力電流の変換電圧を上記差動増幅器へ供給
するように上記切替えスイッチを制御するスイッチ制御
手段と、 を設けたことを特徴とする無電源変換器。2. A power supply voltage is generated from an input current, applied to a power supply terminal of a differential amplifier to make it operate, and the input current is converted to a voltage to convert one input of the differential amplifier. Side, and obtains a converted output based on the output of the differential amplifier, and provides an electrical feedback signal corresponding to the converted output to the other input side of the differential amplifier by negative feedback so as to correspond to the input current. Means for supplying a generated power supply voltage, generating a dummy voltage equal to a converted voltage of an input current corresponding to a minimum value of the converted output or a value slightly higher than the minimum value. A switch for switching between the converted voltage of the input current and the dummy voltage and supplying the converted voltage to the differential amplifier; and converting the dummy voltage when the input current is equal to or less than a predetermined value, and converting the input current when the input current is equal to or more than a predetermined value. Switch control means for controlling the changeover switch so as to supply a voltage to the differential amplifier.
変換出力の最小値またはそれを僅かに上回る値に対応し
た入力電流の変換電圧と等しいダミー電圧を発生させる
手段と、 上記入力電流の変換電圧と上記ダミー電圧とを切替えて
上記差動増幅器へ供給する切替えスイッチと、 上記入力電流が所定値以下で上記ダミー電圧を、所定値
以上で上記入力電流の変換電圧を上記差動増幅器へ供給
するように上記切替えスイッチを制御する第２スイッチ
制御手段とを備え、 上 記スイッチがオンになった後に、上記切替えスイッチ
がダミー電圧側から入力電流の変換電圧側に切替わるよ
うに上記スィッチ制御手段の所定値、及び上記第２スィ
ッチ制御手段の所定値が選定されていることを特徴とす
る請求項１に記載の無電源変換器。3. The system according to claim 2, wherein said generated power supply voltage is supplied.
Corresponding to the minimum value of the conversion output or slightly above
A dummy voltage equal to the converted voltage of the input current
Means, and switching between the converted voltage of the input current and the dummy voltage.
A changeover switch to be supplied to the differential amplifier, and the dummy voltage is set to a predetermined value when the input current is equal to or less than a predetermined value.
As described above, the converted voltage of the input current is supplied to the differential amplifier.
Switch for controlling the changeover switch so as to perform
And control means, after the upper SL switch is turned on, the changeover switch Waru switch to convert voltage side of the input current from the dummy voltage side
The predetermined value of the switch control means and the second switch
2. The powerless converter according to claim 1, wherein a predetermined value of the switch control means is selected .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP964892A JP2741297B2 (en) | 1992-01-23 | 1992-01-23 | Powerless converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP964892A JP2741297B2 (en) | 1992-01-23 | 1992-01-23 | Powerless converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0642503A JPH0642503A (en) | 1994-02-15 |
| JP2741297B2 true JP2741297B2 (en) | 1998-04-15 |
Family
ID=11726040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP964892A Expired - Lifetime JP2741297B2 (en) | 1992-01-23 | 1992-01-23 | Powerless converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2741297B2 (en) |
-
1992
- 1992-01-23 JP JP964892A patent/JP2741297B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0642503A (en) | 1994-02-15 |
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