JPH01101178U - - Google Patents
Info
- Publication number
- JPH01101178U JPH01101178U JP19423987U JP19423987U JPH01101178U JP H01101178 U JPH01101178 U JP H01101178U JP 19423987 U JP19423987 U JP 19423987U JP 19423987 U JP19423987 U JP 19423987U JP H01101178 U JPH01101178 U JP H01101178U
- Authority
- JP
- Japan
- Prior art keywords
- current transformer
- switching element
- secondary winding
- power supply
- winding
- 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.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000009499 grossing Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims 5
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
Landscapes
- Dc-Dc Converters (AREA)
Description
第１図は本考案の一実施例を示す回路図、第２
図〜第４図は本考案を説明するための波形例を示
す図、第５図は従来のスイツチング電源の過電流
検出回路を示す回路図、第６図〜第８図は従来の
スイツチング電源の過電流検出回路を説明するた
めの波形例を示す図である。
ＣＴ……カレントトランス、Ｒ３……終端抵抗
、Ｃ２……コンデンサ、Ｄ３……ダイオード、Ｒ
４……抵抗、Ｔ１……スイツチングトランス、Ｔ
ｒ１……スイツチングトランジスタ、１……整流
平滑回路、６……制御回路、９……過電流検出回
路、１０……コンパレータ。
Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
4 to 4 are diagrams showing waveform examples for explaining the present invention, FIG. 5 is a circuit diagram showing an overcurrent detection circuit of a conventional switching power supply, and FIGS. 6 to 8 are diagrams showing an overcurrent detection circuit of a conventional switching power supply. FIG. 3 is a diagram showing an example of waveforms for explaining an overcurrent detection circuit. CT...Current transformer, R3...Terminal resistor, C2...Capacitor, D3...Diode, R
4...Resistor, T1...Switching transformer, T
r1... Switching transistor, 1... Rectifying and smoothing circuit, 6... Control circuit, 9... Overcurrent detection circuit, 10... Comparator.
Claims (1)
線に整流平滑回路が接続されたトランスと、前記
スイツチング素子の制御電極に接続されパルス巾
を制御して出力する制御回路とよりなるスイツチ
ング電源において、このスイツチング電源に流れ
る過電流を検出するカレントトランスと、このカ
レントトランスの２次巻線間に接続された終端抵
抗と、この終端抵抗と前記カレントトランスの２
次巻線との接続点間にダイオード及びコンデンサ
が接続され前記スイツチング素子のオフ時前記カ
レントトランスの出力がダイオードを介してコン
デンサに充電される充電回路と、前記ダイオード
及びコンデンサの接続点と前記ダイオード及び終
端抵抗の接続点間に接続された抵抗とを具備する
ことを特徴とするスイツチング電源の過電流検出
回路。 In a switching power supply comprising a transformer in which a switching element is connected to a primary winding and a rectifying and smoothing circuit is connected to a secondary winding, and a control circuit connected to a control electrode of the switching element to control and output a pulse width. , a current transformer that detects an overcurrent flowing through the switching power supply, a terminating resistor connected between the secondary winding of the current transformer, and a terminal resistor connected to the secondary winding of the current transformer.
a charging circuit in which a diode and a capacitor are connected between the connection point with the next winding, and the output of the current transformer is charged to the capacitor via the diode when the switching element is turned off; and a resistor connected between the connection points of the terminating resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987194239U JP2513741Y2 (en) | 1987-12-22 | 1987-12-22 | Overcurrent detection circuit for switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987194239U JP2513741Y2 (en) | 1987-12-22 | 1987-12-22 | Overcurrent detection circuit for switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01101178U true JPH01101178U (en) | 1989-07-07 |
| JP2513741Y2 JP2513741Y2 (en) | 1996-10-09 |
Family
ID=31484979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987194239U Expired - Lifetime JP2513741Y2 (en) | 1987-12-22 | 1987-12-22 | Overcurrent detection circuit for switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2513741Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012042898A1 (en) * | 2010-09-30 | 2012-04-05 | パナソニック株式会社 | Overpower protection circuit and power supply apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS614416A (en) * | 1984-06-19 | 1986-01-10 | 東光株式会社 | Overcurrent detector for switching power source |
-
1987
- 1987-12-22 JP JP1987194239U patent/JP2513741Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS614416A (en) * | 1984-06-19 | 1986-01-10 | 東光株式会社 | Overcurrent detector for switching power source |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012042898A1 (en) * | 2010-09-30 | 2012-04-05 | パナソニック株式会社 | Overpower protection circuit and power supply apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2513741Y2 (en) | 1996-10-09 |
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