JPS5450948A - Bidirectional constant current circuit - Google Patents
Bidirectional constant current circuitInfo
- Publication number
- JPS5450948A JPS5450948A JP11754477A JP11754477A JPS5450948A JP S5450948 A JPS5450948 A JP S5450948A JP 11754477 A JP11754477 A JP 11754477A JP 11754477 A JP11754477 A JP 11754477A JP S5450948 A JPS5450948 A JP S5450948A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- constant current
- field effect
- effect transistor
- drain
- 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
Landscapes
- Control Of Electrical Variables (AREA)
Abstract
PURPOSE: To promote a simplification of circuit construction, by using one field effect transistor to obtain a bidirectional constant current characteristic.
CONSTITUTION: A current I1 flows into a drain D of field effect transistor Q to appear in a source S with a voltage drop produced in a resistor R3. This causes a potential at another end of the resistor R3 to become lower than that at the drain side D of the field effect transistor Q, with a diode D4 turned on and the other diode D3 becoming a state of off. Accordingly, as a coltage at another end of a resistor R4 is applied to a gate G of the field effect transistor Q as a constant negative bias voltage through the diode D4, a constant current +1, determined by the resistor R4, flows in a direction from the drain D to the source S. And in a direction from the source S to the drain D, a constant current +2, determined by the resistor R3, flows in the same manner of operation as described in the above
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11754477A JPS5450948A (en) | 1977-09-30 | 1977-09-30 | Bidirectional constant current circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11754477A JPS5450948A (en) | 1977-09-30 | 1977-09-30 | Bidirectional constant current circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5450948A true JPS5450948A (en) | 1979-04-21 |
Family
ID=14714419
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11754477A Pending JPS5450948A (en) | 1977-09-30 | 1977-09-30 | Bidirectional constant current circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5450948A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5710818A (en) * | 1981-02-09 | 1982-01-20 | Yokogawa Hokushin Electric Corp | Bipolar type constant current device |
US5191279A (en) * | 1990-03-15 | 1993-03-02 | Ixys Corporation | Current limiting method and apparatus |
-
1977
- 1977-09-30 JP JP11754477A patent/JPS5450948A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5710818A (en) * | 1981-02-09 | 1982-01-20 | Yokogawa Hokushin Electric Corp | Bipolar type constant current device |
US5191279A (en) * | 1990-03-15 | 1993-03-02 | Ixys Corporation | Current limiting method and apparatus |
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