JPH0488334U - - Google Patents
Info
- Publication number
- JPH0488334U JPH0488334U JP12903090U JP12903090U JPH0488334U JP H0488334 U JPH0488334 U JP H0488334U JP 12903090 U JP12903090 U JP 12903090U JP 12903090 U JP12903090 U JP 12903090U JP H0488334 U JPH0488334 U JP H0488334U
- Authority
- JP
- Japan
- Prior art keywords
- latch circuit
- detection section
- current detection
- circuit
- overcurrent protection
- 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
- 238000001514 detection method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Dc-Dc Converters (AREA)
- Electronic Switches (AREA)
Description
【図１】本考案の実施例による過電流保護回路
の回路図である。FIG. 1 is a circuit diagram of an overcurrent protection circuit according to an embodiment of the present invention.
【図２】上記過電流保護回路の
動作を説明するため、回路の各部の信号波形を示
す信号波形図である。FIG. 2 is a signal waveform diagram showing signal waveforms at various parts of the circuit in order to explain the operation of the overcurrent protection circuit.
【図３】従来技術による過
電流保護回路の一例を示す回路図である。
符号の説明、ＣＴ１……カレントトランス、Ｄ
１……ダイオードスタツク、Ｒ１〜Ｒ７……抵抗
、Ｃ１〜Ｃ３……コンデンサ、Ｑ１〜Ｑ３……ト
ランジスタ、１０……電流検出部、２０……ラツ
チ回路、３０……ＰＷＭ制御回路、４０……スイ
ツチング電源回路。FIG. 3 is a circuit diagram showing an example of an overcurrent protection circuit according to the prior art. Explanation of symbols, CT1...Current transformer, D
1...Diode stack, R1-R7...Resistor, C1-C3...Capacitor, Q1-Q3...Transistor, 10...Current detection section, 20...Latch circuit, 30...PWM control circuit, 40... ...Switching power supply circuit.
Claims (1)
れた電流の値によつて電源回路を停止させるラツ
チ回路とを備え、上記電流検出部及び上記ラツチ
回路の間に、電源投入から所定の期間、上記ラツ
チ回路の動作を遅延させるための遅延手段を具備
したスイツチング素子を挿入したことを特徴とす
る過電流保護回路。 It comprises a current detection section and a latch circuit that stops the power supply circuit depending on the value of the current detected by the current detection section, and a latch circuit is provided between the current detection section and the latch circuit for a predetermined period after the power is turned on. An overcurrent protection circuit characterized in that a switching element provided with a delay means for delaying the operation of the latch circuit is inserted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990129030U JP2547101Y2 (en) | 1990-11-30 | 1990-11-30 | Overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990129030U JP2547101Y2 (en) | 1990-11-30 | 1990-11-30 | Overcurrent protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0488334U true JPH0488334U (en) | 1992-07-31 |
| JP2547101Y2 JP2547101Y2 (en) | 1997-09-10 |
Family
ID=31876455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990129030U Expired - Lifetime JP2547101Y2 (en) | 1990-11-30 | 1990-11-30 | Overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2547101Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10275020A (en) * | 1997-03-31 | 1998-10-13 | Toshiba Lighting & Technol Corp | Constant-voltage circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54127548A (en) * | 1978-03-27 | 1979-10-03 | Matsushita Electric Works Ltd | Apparatus for protecting motor from impact load |
| JPH02193520A (en) * | 1989-01-20 | 1990-07-31 | Fujitsu General Ltd | Power source interrupting method with excess current detector |
-
1990
- 1990-11-30 JP JP1990129030U patent/JP2547101Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54127548A (en) * | 1978-03-27 | 1979-10-03 | Matsushita Electric Works Ltd | Apparatus for protecting motor from impact load |
| JPH02193520A (en) * | 1989-01-20 | 1990-07-31 | Fujitsu General Ltd | Power source interrupting method with excess current detector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10275020A (en) * | 1997-03-31 | 1998-10-13 | Toshiba Lighting & Technol Corp | Constant-voltage circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2547101Y2 (en) | 1997-09-10 |
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