JPS54139046A - Constant voltage power circuit - Google Patents

Constant voltage power circuit

Info

Publication number
JPS54139046A
JPS54139046A JP4755478A JP4755478A JPS54139046A JP S54139046 A JPS54139046 A JP S54139046A JP 4755478 A JP4755478 A JP 4755478A JP 4755478 A JP4755478 A JP 4755478A JP S54139046 A JPS54139046 A JP S54139046A
Authority
JP
Japan
Prior art keywords
transistor
voltage
power supply
constant voltage
voltage power
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
JP4755478A
Other languages
Japanese (ja)
Inventor
Shigeyoshi Okubo
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 JP4755478A priority Critical patent/JPS54139046A/en
Publication of JPS54139046A publication Critical patent/JPS54139046A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To obtain a good DC power supply with a less ripple even if the voltage of unstable power supply drops by controlling the reference voltage according to the output of detecting circuit in such a way that the output voltage drops.
CONSTITUTION: The emitter of detecting transistor 5 is connected to the collector of another transistor 13, the emitter of transistor 13 is connected to the collector of control transistor 2 and its base is connected to the middle point P between the resistances 10 and 11 which divide the unstable input voltage. Also a capacitor 12 is connected to both the middle point P and ground. When the time constant of filter circuit which consists of the resistances 10, 11 and capacitor 12 is made sufficiently greater as compared with the ripple period of unstable power supply, the base voltage of transistor 13 is made constant with respect to the ripple period, a stable output voltage can be obtained.
COPYRIGHT: (C)1979,JPO&Japio
JP4755478A 1978-04-20 1978-04-20 Constant voltage power circuit Pending JPS54139046A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4755478A JPS54139046A (en) 1978-04-20 1978-04-20 Constant voltage power circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4755478A JPS54139046A (en) 1978-04-20 1978-04-20 Constant voltage power circuit

Publications (1)

Publication Number Publication Date
JPS54139046A true JPS54139046A (en) 1979-10-29

Family

ID=12778384

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4755478A Pending JPS54139046A (en) 1978-04-20 1978-04-20 Constant voltage power circuit

Country Status (1)

Country Link
JP (1) JPS54139046A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4928834A (en) * 1972-07-13 1974-03-14

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4928834A (en) * 1972-07-13 1974-03-14

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