JPH0225874U - - Google Patents
Info
- Publication number
- JPH0225874U JPH0225874U JP10340488U JP10340488U JPH0225874U JP H0225874 U JPH0225874 U JP H0225874U JP 10340488 U JP10340488 U JP 10340488U JP 10340488 U JP10340488 U JP 10340488U JP H0225874 U JPH0225874 U JP H0225874U
- Authority
- JP
- Japan
- Prior art keywords
- detection
- junction
- overcurrent
- setting
- detection resistor
- 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 17
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Emergency Protection Circuit Devices (AREA)
- Dc-Dc Converters (AREA)
Description
第１図および第２図が本考案に関し、第１図は
本考案による過電流検出回路の基本的な実施例回
路図、第２図は本考案による過電流検出回路をス
イツチングレギユレータに適用した実施例回路図
である。第３図は従来の過電流検出回路の回路図
である。図において、
１：過電流検出抵抗、２：設定要素ないしは設
定抵抗、３：検出トランジスタ、４：ｐｎ接合要
素ないしはダイオード、５〜７：抵抗、１０：電
源、２０：負荷、ｉ：検出抵抗を流れる電波、Ｓ
：過電流検出信号、ｖ１：検出抵抗の電圧降下、
ｖ２：設定要素の発生電圧、である。
Figures 1 and 2 relate to the present invention; Figure 1 is a basic embodiment circuit diagram of an overcurrent detection circuit according to the present invention, and Figure 2 is a circuit diagram of an overcurrent detection circuit according to the present invention in a switching regulator. It is a circuit diagram of an applied example. FIG. 3 is a circuit diagram of a conventional overcurrent detection circuit. In the figure, 1: overcurrent detection resistor, 2: setting element or setting resistor, 3: detection transistor, 4: pn junction element or diode, 5 to 7: resistor, 10: power supply, 20: load, i: detection resistor. flowing radio waves, S
: Overcurrent detection signal, v1: Voltage drop of detection resistor,
v2: The generated voltage of the setting element.
Claims (1)
検出抵抗の電圧降下から過電流を検出する検出ト
ランジスタと、過電流検出値を設定するための電
圧を発生する設定要素と、ｐｎ接合要素とを備え
てなり、検出トランジスタのベース・エミツタ間
に対して検出抵抗の電圧降下が順方向に、設定要
素の発生電圧が逆方向にそれぞれ掛かり、かつｐ
ｎ接合要素のｐｎ接合が検出トランジスタのベー
ス・エミツタ間のｐｎ接合と逆方向になるように
、検出抵抗、設定要素、検出トランジスタのベー
ス・エミツタ間およびｐｎ接合要素を環状に接続
したことを特徴とする過電流検出回路。 a detection resistor that receives a current for which overcurrent is to be detected;
It includes a detection transistor that detects overcurrent from the voltage drop of the detection resistor, a setting element that generates a voltage for setting the overcurrent detection value, and a pn junction element. The voltage drop across the detection resistor is applied in the forward direction, the voltage generated by the setting element is applied in the opposite direction, and p
The detection resistor, the setting element, the base and emitter of the detection transistor, and the pn junction element are connected in a ring so that the pn junction of the n junction element is in the opposite direction to the pn junction between the base and emitter of the detection transistor. Overcurrent detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10340488U JPH0225874U (en) | 1988-08-04 | 1988-08-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10340488U JPH0225874U (en) | 1988-08-04 | 1988-08-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0225874U true JPH0225874U (en) | 1990-02-20 |
Family
ID=31334205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10340488U Pending JPH0225874U (en) | 1988-08-04 | 1988-08-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0225874U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS567080B2 (en) * | 1974-12-09 | 1981-02-16 | ||
| JPS57106871A (en) * | 1980-12-24 | 1982-07-02 | Hitachi Ltd | Current detecting circuit |
-
1988
- 1988-08-04 JP JP10340488U patent/JPH0225874U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS567080B2 (en) * | 1974-12-09 | 1981-02-16 | ||
| JPS57106871A (en) * | 1980-12-24 | 1982-07-02 | Hitachi Ltd | Current detecting circuit |
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