JPH046234U - - Google Patents
Info
- Publication number
- JPH046234U JPH046234U JP4614390U JP4614390U JPH046234U JP H046234 U JPH046234 U JP H046234U JP 4614390 U JP4614390 U JP 4614390U JP 4614390 U JP4614390 U JP 4614390U JP H046234 U JPH046234 U JP H046234U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- detection resistor
- voltage
- load
- current detection
- 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 6
- 238000009499 grossing Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Description
第１図はこの考案の第１実施例の過電流検出保
護回路図、第２図Ａ，Ｂは第１実施例の各部動作
波形図、第３図はこの考案の第２実施例の回路図
、第４図は従来技術の回路図である。
１……トランジスタ、２……電流検出用抵抗、
３……平滑抵抗、４……平滑コンデンサ、５……
三角波発生器、６……第１のリフアレンス電圧源
、７……第２のリフアレンス電圧源、８……演算
増幅器、９……コンパレータ、１０……負荷、１
１……昇圧回路、１７……インバータ、１８……
ＡＮＤ回路。
Fig. 1 is an overcurrent detection protection circuit diagram of the first embodiment of this invention, Fig. 2 A and B are operation waveform diagrams of each part of the first embodiment, and Fig. 3 is a circuit diagram of the second embodiment of this invention. , FIG. 4 is a circuit diagram of the prior art. 1...Transistor, 2...Resistor for current detection,
3...Smoothing resistor, 4...Smoothing capacitor, 5...
Triangular wave generator, 6... First reference voltage source, 7... Second reference voltage source, 8... Operational amplifier, 9... Comparator, 10... Load, 1
1... Boost circuit, 17... Inverter, 18...
AND circuit.
Claims (1)
用抵抗とを直列接続し、電流検出用抵抗で検出し
た負荷の状態により、前記トランジスタを制御し
てトランジスタを保護する回路において、 電流検出用抵抗により検出した電圧を増幅する
増幅器と、この増幅された電圧を平滑する平滑回
路と、その出力を入力の一端に接続し、他端に三
角波を入力したコンパレータと、コンパレータの
出力を前記トランジスタの制御電極に印加するこ
とを特徴とする過電流検出保護回路。[Scope of Claim for Utility Model Registration] In a circuit that connects a load, a switching transistor, and a current detection resistor in series, and protects the transistor by controlling the transistor based on the state of the load detected by the current detection resistor, An amplifier that amplifies the voltage detected by the detection resistor, a smoothing circuit that smoothes the amplified voltage, a comparator whose output is connected to one end of the input and a triangular wave inputted to the other end, and the output of the comparator is connected to the An overcurrent detection and protection circuit characterized by applying voltage to a control electrode of a transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4614390U JPH046234U (en) | 1990-04-26 | 1990-04-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4614390U JPH046234U (en) | 1990-04-26 | 1990-04-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH046234U true JPH046234U (en) | 1992-01-21 |
Family
ID=31560962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4614390U Pending JPH046234U (en) | 1990-04-26 | 1990-04-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH046234U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6387173A (en) * | 1986-09-29 | 1988-04-18 | Canon Inc | Power unit |
| JPH0274123A (en) * | 1988-09-09 | 1990-03-14 | Fujitsu Ltd | Overcurrent protective system |
-
1990
- 1990-04-26 JP JP4614390U patent/JPH046234U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6387173A (en) * | 1986-09-29 | 1988-04-18 | Canon Inc | Power unit |
| JPH0274123A (en) * | 1988-09-09 | 1990-03-14 | Fujitsu Ltd | Overcurrent protective system |
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