JPS54114742A - Constant current power circuit - Google Patents

Constant current power circuit

Info

Publication number
JPS54114742A
JPS54114742A JP2182778A JP2182778A JPS54114742A JP S54114742 A JPS54114742 A JP S54114742A JP 2182778 A JP2182778 A JP 2182778A JP 2182778 A JP2182778 A JP 2182778A JP S54114742 A JPS54114742 A JP S54114742A
Authority
JP
Japan
Prior art keywords
transistor
constant current
dependence
current power
temperature coefficient
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
JP2182778A
Other languages
Japanese (ja)
Inventor
Takashi Matsumoto
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 Ltd
Original Assignee
Hitachi Ltd
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 Ltd filed Critical Hitachi Ltd
Priority to JP2182778A priority Critical patent/JPS54114742A/en
Publication of JPS54114742A publication Critical patent/JPS54114742A/en
Pending legal-status Critical Current

Links

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

Abstract

PURPOSE: To reduce power voltage dependence and temperature dependence by utilizing the fact that the saturated voltage of transistor has positive temperature coefficient.
CONSTITUTION: The transistor Q3 is interted into the emittor of the transistor Q2 of the constant voltage circuit 3 driving the transistor Q1 for controlling constant current and the power source VEE. To keep the transistor Q3 in the saturated state all the time, the base of the transistor Q3 is pulled up by the resistor R5 and thereby positive temperature coefficient of the saturated state of the transistor Q3 and negative temperature coefficient between the base and emitter of the transistor Q2 are compensated. Thus, it is possible to reduce temperature dependence and power voltage dependence in constant current power source.
COPYRIGHT: (C)1979,JPO&Japio
JP2182778A 1978-02-27 1978-02-27 Constant current power circuit Pending JPS54114742A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2182778A JPS54114742A (en) 1978-02-27 1978-02-27 Constant current power circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2182778A JPS54114742A (en) 1978-02-27 1978-02-27 Constant current power circuit

Publications (1)

Publication Number Publication Date
JPS54114742A true JPS54114742A (en) 1979-09-07

Family

ID=12065890

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2182778A Pending JPS54114742A (en) 1978-02-27 1978-02-27 Constant current power circuit

Country Status (1)

Country Link
JP (1) JPS54114742A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007128880A (en) * 2005-10-31 2007-05-24 Tyco Electronics Austria Gmbh Switch device and auxiliary electric circuit for the switch device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4997259A (en) * 1973-01-24 1974-09-13
JPS501352A (en) * 1973-05-10 1975-01-08
JPS50121759A (en) * 1974-03-14 1975-09-23
JPS5247073U (en) * 1975-09-02 1977-04-02

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4997259A (en) * 1973-01-24 1974-09-13
JPS501352A (en) * 1973-05-10 1975-01-08
JPS50121759A (en) * 1974-03-14 1975-09-23
JPS5247073U (en) * 1975-09-02 1977-04-02

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007128880A (en) * 2005-10-31 2007-05-24 Tyco Electronics Austria Gmbh Switch device and auxiliary electric circuit for the switch device

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