JPS56143025A - Power supply circuit - Google Patents

Power supply circuit

Info

Publication number
JPS56143025A
JPS56143025A JP4640080A JP4640080A JPS56143025A JP S56143025 A JPS56143025 A JP S56143025A JP 4640080 A JP4640080 A JP 4640080A JP 4640080 A JP4640080 A JP 4640080A JP S56143025 A JPS56143025 A JP S56143025A
Authority
JP
Japan
Prior art keywords
transistor
current
power supply
emitter
supply circuit
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
JP4640080A
Other languages
Japanese (ja)
Inventor
Yoshiharu Nagahara
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP4640080A priority Critical patent/JPS56143025A/en
Publication of JPS56143025A publication Critical patent/JPS56143025A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

PURPOSE:To reduce the current loss caused by the output voltage detecting circuit, by connecting the emitter of the 2nd transistor to the emitter of the 3rd transistor in which the collector is connected to the power supply, in a regulated power supply circuit. CONSTITUTION:Assuming that the 1st transistor Q1 of hEF=100 is used and an output current up to 300mA is obtained, it is required to flow the current up to 300mA to the emitter of the 2nd transistor Q2. If the 3rd transistor Q3 has hEF=300, 10muA current is sufficient for the base. Thus, the current loss at no or light load can remarkably be reduced by selecting the resistance R2 which can flow only about 10muA current at a maximum.
JP4640080A 1980-04-08 1980-04-08 Power supply circuit Pending JPS56143025A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4640080A JPS56143025A (en) 1980-04-08 1980-04-08 Power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4640080A JPS56143025A (en) 1980-04-08 1980-04-08 Power supply circuit

Publications (1)

Publication Number Publication Date
JPS56143025A true JPS56143025A (en) 1981-11-07

Family

ID=12746096

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4640080A Pending JPS56143025A (en) 1980-04-08 1980-04-08 Power supply circuit

Country Status (1)

Country Link
JP (1) JPS56143025A (en)

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