JPH0410424U - - Google Patents
Info
- Publication number
- JPH0410424U JPH0410424U JP5066190U JP5066190U JPH0410424U JP H0410424 U JPH0410424 U JP H0410424U JP 5066190 U JP5066190 U JP 5066190U JP 5066190 U JP5066190 U JP 5066190U JP H0410424 U JPH0410424 U JP H0410424U
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- output
- switching element
- current detection
- amplification system
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 1
Description
第１図は本考案の一実施例による保護動作範囲
の説明図、第２図は従来から用いられている出力
保護回路の一例を示す構成説明図、第３図は第２
図のトランジスタの動作範囲の説明図、第４図は
従来の保護動作範囲の説明図である。
Ｑ１，Ｑ２……トランジスタ、Ａ……演算増幅
器、ＷＣ……ウインドウコンパレータ、ＳＷ……
スイツチング素子、ｒ……電流検出抵抗、Ｒａ，
Ｒｂ，Ｒ１〜Ｒ４……抵抗。
Fig. 1 is an explanatory diagram of the protection operation range according to an embodiment of the present invention, Fig. 2 is a configuration explanatory diagram showing an example of a conventional output protection circuit, and Fig. 3 is an explanatory diagram of the
FIG. 4 is an explanatory diagram of the operating range of the transistor shown in the figure, and FIG. 4 is an explanatory diagram of the conventional protective operating range. Q1 , Q2 ...transistor, A...operational amplifier, WC...window comparator, SW...
Switching element, r... Current detection resistor, Ra,
Rb, R1 to R4 ...Resistance.
Claims (1)
よびスイツチング素子と、 反転入力端子が抵抗Ｒ１を介して電流検出抵抗
と出力増幅系統の接続点に接続されるとともに抵
抗Ｒ２を介して出力端子に接続され、非反転入力
端子が抵抗Ｒ３を介して電流検出抵抗とスイツチ
ング素子の接続点に接続されるとともに抵抗Ｒ４
を介して共通電位点に接続された演算増幅器と、 この演算増幅器の出力信号の大きさを設定値と
比較し、その出力信号に応じて選択的にスイツチ
ング素子をオンオフ駆動するコンパレータとを具
備し、 前記抵抗Ｒ１〜Ｒ４が、 （Ｒ２・Ｒ３）／（Ｒ１・Ｒ４）＜１ になるように選定されたことを特徴とする出力保
護回路。[Claims for Utility Model Registration] A current detection resistor and a switching element connected in series to the output amplification system, an inverting input terminal connected to the connection point of the current detection resistor and the output amplification system via a resistor R1 , and a resistor connected in series to the output amplification system. The non-inverting input terminal is connected to the connection point between the current detection resistor and the switching element via resistor R3 , and the resistor R4 is connected to the output terminal via R2 .
and a comparator that compares the magnitude of the output signal of the operational amplifier with a set value and selectively turns on and off the switching element according to the output signal. , An output protection circuit characterized in that the resistors R 1 to R 4 are selected such that (R 2 *R 3 )/(R 1 *R 4 )<1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5066190U JPH0410424U (en) | 1990-05-15 | 1990-05-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5066190U JPH0410424U (en) | 1990-05-15 | 1990-05-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0410424U true JPH0410424U (en) | 1992-01-29 |
Family
ID=31569401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5066190U Pending JPH0410424U (en) | 1990-05-15 | 1990-05-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0410424U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09311145A (en) * | 1996-05-24 | 1997-12-02 | Hitachi Ltd | Current detector |
-
1990
- 1990-05-15 JP JP5066190U patent/JPH0410424U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09311145A (en) * | 1996-05-24 | 1997-12-02 | Hitachi Ltd | Current detector |
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