JPS5619121A - Constant electric current circuit - Google Patents

Constant electric current circuit

Info

Publication number
JPS5619121A
JPS5619121A JP9374079A JP9374079A JPS5619121A JP S5619121 A JPS5619121 A JP S5619121A JP 9374079 A JP9374079 A JP 9374079A JP 9374079 A JP9374079 A JP 9374079A JP S5619121 A JPS5619121 A JP S5619121A
Authority
JP
Japan
Prior art keywords
voltage
transistor
emitter
change
emitter voltage
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
Application number
JP9374079A
Other languages
Japanese (ja)
Inventor
Tomio Fukuda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Denshi KK
Original Assignee
Hitachi Denshi KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP9374079A priority Critical patent/JPS5619121A/en
Publication of JPS5619121A publication Critical patent/JPS5619121A/en
Pending legal-status Critical Current

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  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

PURPOSE: To realize the control circuit excellent in the temperature characteristics, by setting the base voltage from the output signal of the differential amplifier taking the emitter voltage of the transistor and the set voltage setting the emitter voltage.
CONSTITUTION: Since the DC amplifier 9 amplified the difference between the voltage V at point (a) and the emitter voltage of the transistor 13 at point (b), and feeds it to the base of the transistor 13 to change the emitter voltage of the transistor 13, the emitter voltage of the transistor 13 is almost equal to the voltage input at point (a). The voltage across the current setting resistor 14 is +E -V and the capacitor 8 is charged and the sawtooth wave signal is output by on and off of the switch 7. The potential difference between the base and emitter of the transistor 13 is changed against the temperature change and the output signal of the DC amplifier 9 is changed so that the change in the emitter voltage can be corrected. Accordingly, the emitter potential of the transistor 13 is not changed by temperature, the voltage across the resistor 14 is stable and no current change due to temperature change is caused.
COPYRIGHT: (C)1981,JPO&Japio
JP9374079A 1979-07-25 1979-07-25 Constant electric current circuit Pending JPS5619121A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9374079A JPS5619121A (en) 1979-07-25 1979-07-25 Constant electric current circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9374079A JPS5619121A (en) 1979-07-25 1979-07-25 Constant electric current circuit

Publications (1)

Publication Number Publication Date
JPS5619121A true JPS5619121A (en) 1981-02-23

Family

ID=14090799

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9374079A Pending JPS5619121A (en) 1979-07-25 1979-07-25 Constant electric current circuit

Country Status (1)

Country Link
JP (1) JPS5619121A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5318175U (en) * 1976-07-27 1978-02-16

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5318175U (en) * 1976-07-27 1978-02-16

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