JPS57106871A - Current detecting circuit - Google Patents
Current detecting circuitInfo
- Publication number
- JPS57106871A JPS57106871A JP18198780A JP18198780A JPS57106871A JP S57106871 A JPS57106871 A JP S57106871A JP 18198780 A JP18198780 A JP 18198780A JP 18198780 A JP18198780 A JP 18198780A JP S57106871 A JPS57106871 A JP S57106871A
- Authority
- JP
- Japan
- Prior art keywords
- current
- voltage
- transistor
- emittor
- transistors
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/145—Indicating the presence of current or voltage
- G01R19/15—Indicating the presence of current
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
PURPOSE:To improve the accuracy of detected current and to reduce voltage loss by applying the total voltage of the voltage between the emmiter and collector of other transistor and the voltage of current detecting resistance to a current detecting transistor. CONSTITUTION:Constant currents I2, I1 are set up for the emittor areas of transistors Q15, Q16 so that the emittor current density of the transistors Q15, Q16 are almost equal. Since the transistor Q16 is turned off and the collector current does not flow under current to be detected I>=R18I2/R101, the attracting current of constant current I1 can be obtained to an output terminal OUT. On the other hand, when the transistor is turned on and the collector current becomes equal to the constant current I1 under L<=R18I1/R101, the current of output terminal OUT is turned to zero and it can be detected that current of I= R18I1/R101 or more flows. Thus, the voltage between the base and emittor of transistors is offset each other and temperature is compensated, thereby detecting current accurately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18198780A JPS57106871A (en) | 1980-12-24 | 1980-12-24 | Current detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18198780A JPS57106871A (en) | 1980-12-24 | 1980-12-24 | Current detecting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57106871A true JPS57106871A (en) | 1982-07-02 |
| JPH0429027B2 JPH0429027B2 (en) | 1992-05-15 |
Family
ID=16110337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18198780A Granted JPS57106871A (en) | 1980-12-24 | 1980-12-24 | Current detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57106871A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59144799U (en) * | 1983-03-18 | 1984-09-27 | テクトロニクス・インコ−ポレイテツド | lamp control device |
| JPH01274858A (en) * | 1988-04-25 | 1989-11-02 | Tadahiro Yuki | Separation by cyclone |
| JPH0225874U (en) * | 1988-08-04 | 1990-02-20 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5499548A (en) * | 1977-10-21 | 1979-08-06 | Plessey Handel Investment Ag | Circuit device |
-
1980
- 1980-12-24 JP JP18198780A patent/JPS57106871A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5499548A (en) * | 1977-10-21 | 1979-08-06 | Plessey Handel Investment Ag | Circuit device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59144799U (en) * | 1983-03-18 | 1984-09-27 | テクトロニクス・インコ−ポレイテツド | lamp control device |
| JPH01274858A (en) * | 1988-04-25 | 1989-11-02 | Tadahiro Yuki | Separation by cyclone |
| JPH0225874U (en) * | 1988-08-04 | 1990-02-20 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0429027B2 (en) | 1992-05-15 |
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