JPS6430921U - - Google Patents
Info
- Publication number
- JPS6430921U JPS6430921U JP12651987U JP12651987U JPS6430921U JP S6430921 U JPS6430921 U JP S6430921U JP 12651987 U JP12651987 U JP 12651987U JP 12651987 U JP12651987 U JP 12651987U JP S6430921 U JPS6430921 U JP S6430921U
- Authority
- JP
- Japan
- Prior art keywords
- power transistor
- collector
- current
- voltage
- outputs
- 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 description 2
- 238000009795 derivation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Protection Of Static Devices (AREA)
- Amplifiers (AREA)
Description
第１図は、この考案のパワートランジスタの温
度上昇警告装置の１実施例の結線図である。
３，４…パワートランジスタ、５…電力増幅器
、８…電圧検出部、１４…電流検出部、２７…導
出部、３１…コンパレータ、３５…ＬＥＤ、３７
…トランジスタ。
FIG. 1 is a wiring diagram of one embodiment of the power transistor temperature rise warning device of this invention. 3, 4... Power transistor, 5... Power amplifier, 8... Voltage detection section, 14... Current detection section, 27... Derivation section, 31... Comparator, 35... LED, 37
...transistor.
Claims (1)
前記パワートランジスタのコレクタ、エミツタ間
電圧およびコレクタ電流をそれぞれ検出する電圧
検出部および電流検出部と、前記両検出部により
検出された電圧、電流の積より、前記パワートラ
ンジスタのコレクタ損失を導出する導出部と、前
記パワートランジスタのコレクタ損失の最大許容
値より若干小なる基準値と前記導出部による前記
コレクタ損失の導出値とを比較し、前記導出値が
前記基準値に達したときに駆動信号を出力する駆
動部と、表示素子の通電路に設けられ前記駆動信
号によりオンして前記表示素子を駆動するスイツ
チング素子とを備えたパワートランジスタの温度
上昇警告装置。 A power transistor that constitutes a power amplifier,
A voltage detecting section and a current detecting section that respectively detect collector-to-emitter voltage and collector current of the power transistor, and deriving the collector loss of the power transistor from the product of the voltage and current detected by both the detecting sections. compares the derived value of the collector loss by the deriving section with a reference value that is slightly smaller than the maximum allowable value of the collector loss of the power transistor, and when the derived value reaches the reference value, outputs a drive signal. A temperature rise warning device for a power transistor, comprising: a drive unit that outputs an output; and a switching element that is provided in a current conduction path of a display element and is turned on by the drive signal to drive the display element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12651987U JPS6430921U (en) | 1987-08-20 | 1987-08-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12651987U JPS6430921U (en) | 1987-08-20 | 1987-08-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6430921U true JPS6430921U (en) | 1989-02-27 |
Family
ID=31378114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12651987U Pending JPS6430921U (en) | 1987-08-20 | 1987-08-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6430921U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04347594A (en) * | 1991-05-24 | 1992-12-02 | Mitsubishi Electric Corp | Servo motor and drive controller for the same |
-
1987
- 1987-08-20 JP JP12651987U patent/JPS6430921U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04347594A (en) * | 1991-05-24 | 1992-12-02 | Mitsubishi Electric Corp | Servo motor and drive controller for the same |