JPS56143024A - Power supply circuit - Google Patents

Power supply circuit

Info

Publication number
JPS56143024A
JPS56143024A JP4639980A JP4639980A JPS56143024A JP S56143024 A JPS56143024 A JP S56143024A JP 4639980 A JP4639980 A JP 4639980A JP 4639980 A JP4639980 A JP 4639980A JP S56143024 A JPS56143024 A JP S56143024A
Authority
JP
Japan
Prior art keywords
resistor
power supply
supply circuit
variance
emitter
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
JP4639980A
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 JP4639980A priority Critical patent/JPS56143024A/en
Publication of JPS56143024A publication Critical patent/JPS56143024A/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

Abstract

PURPOSE:To suppress the variance of the output voltage and to make the power supply circuit stable, by connecting the collector of the 3rd transistor TR to the junction between the 2nd resistor and the Zener diode which constitute the constant voltage circuit, in a regulated power supply circuit. CONSTITUTION:The base of the 3rd transistor (TR) Q3 is connected to the junction between the resistor R2 and the diode D2, the emitter of this TR Q3 is connected to the emitter of the 2nd TR Q2, and the collector of the 3rd TR Q3 is connected to the junction between the resistor R3 and the Zener diode D1 constituting the constant voltage circuit, allowing to reduce the current flowing to the resistor R2 to a fraction of hFE of the current flowing to the 2nd TR Q2. Thus, the current loss by the resistor R2 can be reduced. Further, the variance of the output voltage due to the variance between the base and emitter of TRs Q2, Q3 can also be suppressed completely.
JP4639980A 1980-04-08 1980-04-08 Power supply circuit Pending JPS56143024A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4639980A JPS56143024A (en) 1980-04-08 1980-04-08 Power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4639980A JPS56143024A (en) 1980-04-08 1980-04-08 Power supply circuit

Publications (1)

Publication Number Publication Date
JPS56143024A true JPS56143024A (en) 1981-11-07

Family

ID=12746067

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4639980A Pending JPS56143024A (en) 1980-04-08 1980-04-08 Power supply circuit

Country Status (1)

Country Link
JP (1) JPS56143024A (en)

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