JPH0410535U - - Google Patents
Info
- Publication number
- JPH0410535U JPH0410535U JP5093790U JP5093790U JPH0410535U JP H0410535 U JPH0410535 U JP H0410535U JP 5093790 U JP5093790 U JP 5093790U JP 5093790 U JP5093790 U JP 5093790U JP H0410535 U JPH0410535 U JP H0410535U
- Authority
- JP
- Japan
- Prior art keywords
- load
- protection circuit
- switching element
- detection means
- current
- 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
Landscapes
- Protection Of Static Devices (AREA)
Description
第１図及び第２図は本考案の第１の実施例を示
し、第１図は電気的構成図、第２図は作用説明用
のタイムチヤートであり、第３図は本考案の第２
図の実施例を示す第１図相当図である。第４図及
び第５図は夫々従来例を示す第１図相当図である
。
図面中、２２，４６は電流検出抵抗（電流検出
手段）、２３ａ乃至２３ｄは出力回路、２４ａ乃
至２４ｄ，５１ａ，５１ｂは負荷出力端子、２５
ａ乃至２５ｄ，４５ａ，４５ｂは出力用トランジ
スタ（スイツチング素子）、２６，４８は制御回
路、２７ａ乃至２７ｄ，４９ａ，４９ｂはＮＡＮ
Ｄ回路、２９は電流検出回路、３１，５３は第１
の保護回路、３３，５６は第２の保護回路、３５
は第１のコンデンサ、３８，５２は保護用トラン
ジスタ、４１は第２のコンデンサ、４４，６１は
サイリスタである。
1 and 2 show a first embodiment of the present invention, FIG. 1 is an electrical configuration diagram, FIG. 2 is a time chart for explaining the operation, and FIG. 3 is a second embodiment of the present invention.
FIG. 2 is a diagram corresponding to FIG. 1 showing the embodiment of the figure. FIGS. 4 and 5 are views corresponding to FIG. 1, respectively, showing conventional examples. In the drawing, 22 and 46 are current detection resistors (current detection means), 23a to 23d are output circuits, 24a to 24d, 51a and 51b are load output terminals, and 25
a to 25d, 45a, 45b are output transistors (switching elements), 26, 48 are control circuits, 27a to 27d, 49a, 49b are NAN
D circuit, 29 is a current detection circuit, 31 and 53 are first
protection circuit, 33, 56 is a second protection circuit, 35
is a first capacitor, 38 and 52 are protection transistors, 41 is a second capacitor, and 44 and 61 are thyristors.
Claims (1)
フ制御により行なうようにしたものにおいて、負
荷電流を検出する電流検出手段と、この電流検出
手段により検出電流値が所定レベルを超えたとき
に一定時間だけ前記スイツチング素子をオフさせ
る第１の保護回路と、前記第１の保護回路の動作
時間の積算が所定時間に達したときに前記スイツ
チング素子をオフさせると共にその状態を保持す
る第２の保護回路とを具備してなる負荷駆動回路
。 ２ 負荷への通断電をスイツチング素子のオンオ
フ制御により行なうようにしたものにおいて、負
荷電流を検出する電流検出手段と、この電流検出
手段により検出電流値が所定レベルを超えたとき
に負荷電流を制限する第１の保護回路と、前記第
１Ｋ保護回路の動作時間の積算が所定時間に達し
たときに前記スイツチング素子をオフさせると共
にその状態を保持する第２の保護回路とを具備し
てなる負荷駆動回路。[Claims for Utility Model Registration] 1. In a device in which power is turned on and off to a load by on/off control of a switching element, the current detection means detects the load current, and the current detection means detects a detected current value at a predetermined level. a first protection circuit that turns off the switching element for a predetermined period of time when the first protection circuit exceeds a predetermined time period; A load drive circuit comprising: a second protection circuit for holding the load; 2 In a device in which power is turned on and off to the load by on/off control of a switching element, there is a current detection means for detecting the load current, and a current detection means that detects the load current when the detected current value exceeds a predetermined level. a first protection circuit that limits the switching element; and a second protection circuit that turns off the switching element and maintains the state when the cumulative operating time of the first K protection circuit reaches a predetermined time. Load drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5093790U JPH0410535U (en) | 1990-05-16 | 1990-05-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5093790U JPH0410535U (en) | 1990-05-16 | 1990-05-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0410535U true JPH0410535U (en) | 1992-01-29 |
Family
ID=31569922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5093790U Pending JPH0410535U (en) | 1990-05-16 | 1990-05-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0410535U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6360613A (en) * | 1986-08-30 | 1988-03-16 | Nec Corp | Differental amplifier |
-
1990
- 1990-05-16 JP JP5093790U patent/JPH0410535U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6360613A (en) * | 1986-08-30 | 1988-03-16 | Nec Corp | Differental amplifier |
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