JPS63156579U - - Google Patents
Info
- Publication number
- JPS63156579U JPS63156579U JP4953287U JP4953287U JPS63156579U JP S63156579 U JPS63156579 U JP S63156579U JP 4953287 U JP4953287 U JP 4953287U JP 4953287 U JP4953287 U JP 4953287U JP S63156579 U JPS63156579 U JP S63156579U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- short
- time
- output
- power supply
- 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 3
- 230000007257 malfunction Effects 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
Landscapes
- Dc-Dc Converters (AREA)
Description
第1図はこの考案の実施例である短絡保護回路
の要部の回路を示す図である。第2図は同短絡保
護回路の動作を説明するための図、第3図は従来
の短絡保護回路を含むスイツチングレギユレータ
の欠点を説明するための図、第4図は従来の短絡
保護回路を含むスイツチングレギユレータの概略
ブロツク図である。
Q…電源出力端子、L…負荷、Q1…出力トラ
ンジスタ、C…制御回路、D…短絡保護回路、D
1…コンパレータ(短絡検出用比較手段)、D2
…短絡保護用タイマ回路、Q3…トランジスタ(
スイツチ回路)、D4…誤動作防止用タイマ回路
。
FIG. 1 is a diagram showing a main part of a short-circuit protection circuit according to an embodiment of this invention. Figure 2 is a diagram to explain the operation of the short-circuit protection circuit, Figure 3 is a diagram to explain the drawbacks of a switching regulator that includes a conventional short-circuit protection circuit, and Figure 4 is a diagram to explain the short-circuit protection circuit. 1 is a schematic block diagram of a switching regulator including circuitry; FIG. Q...Power output terminal, L...Load, Q1...Output transistor, C...Control circuit, D...Short circuit protection circuit, D
1...Comparator (comparison means for short circuit detection), D2
...Timer circuit for short circuit protection, Q3...transistor (
switch circuit), D4...Timer circuit for preventing malfunction.
Claims (1)
づいて出力トランジスタのオン時間を制御する制
御回路を備えるとともに、 前記電源出力または前記比較出力を更に別の基
準値と比較し、電源出力が短絡状態にあるか否か
を判定する短絡検出用比較手段、短絡状態検出時
間を計時するCR時定数回路からなる短絡保護用
タイマ回路、および前記タイマ回路が一定時間を
計時した時に前記出力トランジスタをほぼオフ状
態に設定する手段を含む短絡保護回路を備えるス
イツチングレギユレータにおいて、 前記短絡保護回路に、前記CR時定数回路のコ
ンデンサに並列に接続したスイツチ回路と、電源
オン後一定時間だけこのスイツチ回路をオン状態
に設定する誤動作防止用タイマ回路とを設けたこ
とを特徴とするスイツチングレギユレータの短絡
保護回路。[Claims for Utility Model Registration] Comprising a control circuit that compares a power supply output with a reference value and controls the on-time of an output transistor based on the comparison output, and further sets the power supply output or the comparison output to another reference value. a short-circuit detection comparison means for determining whether or not the power supply output is in a short-circuit condition; a short-circuit protection timer circuit comprising a CR time constant circuit for timing the short-circuit condition detection time; A switching regulator comprising a short-circuit protection circuit including means for setting the output transistor to a substantially OFF state when time is measured, the short-circuit protection circuit including a switch circuit connected in parallel to the capacitor of the CR time constant circuit; A short-circuit protection circuit for a switching regulator, characterized in that it is provided with a timer circuit for preventing malfunction, which sets the switch circuit in an ON state for a certain period of time after the power is turned on.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4953287U JPS63156579U (en) | 1987-03-31 | 1987-03-31 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4953287U JPS63156579U (en) | 1987-03-31 | 1987-03-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS63156579U true JPS63156579U (en) | 1988-10-13 |
Family
ID=30872068
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4953287U Pending JPS63156579U (en) | 1987-03-31 | 1987-03-31 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63156579U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0352556A (en) * | 1989-07-18 | 1991-03-06 | Fuji Electric Co Ltd | Protection circuit of switching power device |
-
1987
- 1987-03-31 JP JP4953287U patent/JPS63156579U/ja active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0352556A (en) * | 1989-07-18 | 1991-03-06 | Fuji Electric Co Ltd | Protection circuit of switching power device |