JPH0464990U - - Google Patents
Info
- Publication number
- JPH0464990U JPH0464990U JP10605990U JP10605990U JPH0464990U JP H0464990 U JPH0464990 U JP H0464990U JP 10605990 U JP10605990 U JP 10605990U JP 10605990 U JP10605990 U JP 10605990U JP H0464990 U JPH0464990 U JP H0464990U
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- transistor
- positive feedback
- switching
- control terminal
- 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
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 1
Landscapes
- Dc-Dc Converters (AREA)
- Electronic Switches (AREA)
Description
第１図及び第２図は本考案の実施例である。第
３図は積分回路のコンデンサ両端の電圧とメイン
スイツチングトランジスタのオン・オフの関係を
示したものである。第４図は従来の方式を示した
ものである。第１図、第２図及び第４図において
、１１はメインスイツチングトランジスタ、１２
は正帰還巻線、１３は直流定電圧電源、１４１及
び１４２はトランジスタ、１７，１４３，１４４
は抵抗である。
第１図及び第２図において、１６はトランジス
タ、１５１は抵抗、１５２はコンデンサである。
第４図において、１８はトランジスタ、１９は
過電流検出抵抗である。
1 and 2 are examples of the present invention. FIG. 3 shows the relationship between the voltage across the capacitor of the integrating circuit and the on/off state of the main switching transistor. FIG. 4 shows a conventional system. In FIGS. 1, 2, and 4, 11 is a main switching transistor, 12 is a main switching transistor;
is a positive feedback winding, 13 is a DC constant voltage power supply, 141 and 142 are transistors, 17, 143, 144
is resistance. In FIGS. 1 and 2, 16 is a transistor, 151 is a resistor, and 152 is a capacitor. In FIG. 4, 18 is a transistor, and 19 is an overcurrent detection resistor.
Claims (1)
グトランジスタと、 ＲＣＣ型スイツチング電源のメイントランスの
正帰還巻線と、 定電圧直流電源と、 前記メインスイツチングトランジスタのベース
と前記定電圧直流電源との間に直列に接続された
コントロール端子を持つトランジスタによるスイ
ツチング回路と、 前記正帰還巻線の両端に接続された、抵抗とコ
ンデンサとからなる積分回路と、 前記スイツチ回路のコントロール端子と前記積
分回路の間に接続され、かつ前記積分回路のコン
デンサ両端の電圧が一定値に達するまで前記コン
トロール端子に、前記正帰還巻線の正帰還電流を
、流すように接続されたトランジスタとからなり
、 これによつて、前記メインスイツチングトラン
ジスタに過電流が流れるのを防止し、スイツチン
グ電源を過電流から保護することを特徴とするＲ
ＣＣ型スイツチング電源の過電流保護回路。[Claims for Utility Model Registration] A main switching transistor of an RCC type switching power supply, a positive feedback winding of a main transformer of the RCC type switching power supply, a constant voltage DC power supply, a base of the main switching transistor and the constant voltage a switching circuit including a transistor having a control terminal connected in series with a DC power supply; an integrating circuit comprising a resistor and a capacitor connected to both ends of the positive feedback winding; and a control terminal of the switching circuit. a transistor connected between the integrating circuits and connected to cause a positive feedback current of the positive feedback winding to flow through the control terminal until the voltage across the capacitor of the integrating circuit reaches a certain value. , thereby preventing overcurrent from flowing through the main switching transistor and protecting the switching power supply from overcurrent.
Overcurrent protection circuit for CC type switching power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10605990U JPH0464990U (en) | 1990-10-09 | 1990-10-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10605990U JPH0464990U (en) | 1990-10-09 | 1990-10-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0464990U true JPH0464990U (en) | 1992-06-04 |
Family
ID=31851996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10605990U Pending JPH0464990U (en) | 1990-10-09 | 1990-10-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0464990U (en) |
-
1990
- 1990-10-09 JP JP10605990U patent/JPH0464990U/ja active Pending
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