JPS5559515A - Constant current circuit - Google Patents
Constant current circuitInfo
- Publication number
- JPS5559515A JPS5559515A JP13150978A JP13150978A JPS5559515A JP S5559515 A JPS5559515 A JP S5559515A JP 13150978 A JP13150978 A JP 13150978A JP 13150978 A JP13150978 A JP 13150978A JP S5559515 A JPS5559515 A JP S5559515A
- Authority
- JP
- Japan
- Prior art keywords
- load
- fet11
- current
- constant current
- 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
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
PURPOSE: To ensure a high accuracy for the constant current circuit with a simple constitution by using the FET as the load current control element.
CONSTITUTION: FET11 is used, and load 1 and load detection resistance 2 are connected to drain D and source S of FET11 each to form a load circuit. At the same time, the voltage is applied to detection amplifier 4 from reference voltage 3 and resistance 2, and the voltage difference is amplified 4 to be applied to gate G of FET11. Thus the drain current of FET11, i.e., load current I is controlled to the high-accuracy constant current. In this case, the gate current is very small in comparison with the drain and source current for FET11 owing to the element characteristics, and as a result the constant current circuit featuring the accuracy of about 1×10-3W1×10-6 can be easily obtained. Furthermore, as load 1 is connected to the power source side, no overcurrent flows to FET11 even with the ground fault of the load. Thus the special overcurrent control element can be omitted.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13150978A JPS5559515A (en) | 1978-10-27 | 1978-10-27 | Constant current circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13150978A JPS5559515A (en) | 1978-10-27 | 1978-10-27 | Constant current circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5559515A true JPS5559515A (en) | 1980-05-06 |
Family
ID=15059688
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13150978A Pending JPS5559515A (en) | 1978-10-27 | 1978-10-27 | Constant current circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5559515A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62158516U (en) * | 1986-03-26 | 1987-10-08 | ||
JP2019215976A (en) * | 2018-06-12 | 2019-12-19 | 株式会社日立ハイテクノロジーズ | Charged particle beam control apparatus |
-
1978
- 1978-10-27 JP JP13150978A patent/JPS5559515A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62158516U (en) * | 1986-03-26 | 1987-10-08 | ||
JP2019215976A (en) * | 2018-06-12 | 2019-12-19 | 株式会社日立ハイテクノロジーズ | Charged particle beam control apparatus |
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