JPS578819A - Series control type transistor regulated power source circuit - Google Patents

Series control type transistor regulated power source circuit

Info

Publication number
JPS578819A
JPS578819A JP8237080A JP8237080A JPS578819A JP S578819 A JPS578819 A JP S578819A JP 8237080 A JP8237080 A JP 8237080A JP 8237080 A JP8237080 A JP 8237080A JP S578819 A JPS578819 A JP S578819A
Authority
JP
Japan
Prior art keywords
resistance
base
current
series
control
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
JP8237080A
Other languages
Japanese (ja)
Inventor
Tomio Takayama
Tomiyasu Sagane
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP8237080A priority Critical patent/JPS578819A/en
Publication of JPS578819A publication Critical patent/JPS578819A/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
    • G05F1/565—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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
    • G05F1/569—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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
    • G05F1/573—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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overcurrent detector

Abstract

PURPOSE:To reduce the power loss of a control transistor (TR) when a load is short-circuited, by providing a diode and a resistance in series to the base of a control TR connected in series to a DC line. CONSTITUTION:To the base of a control TR1 connected in series to a DC line, a diode D and a resistance R8 are connected, and the other terminal of the resistance R8 is connected to the base of a current limit type protecting TR3 via a resistance R9; and one terminal of a current detecting resistance R4 is connected to the emitter of the TR3, whose collector is also connected betweem resistance R1 and R8. In normal operation, the base current of the TR1 is brought under the control of a TR4 to obtain a constant output voltage. If a current more than rated one flows to a load RL, the across voltage of the resistance R4 rises to turn on the TR3 and the base current of the TR1 is shunted to the TR3, decreasing a load current. In this case, the across voltage of the circuit of the resistance R8, diode D, and the base and emitter of the TR1 rises and the current flowing to the base of the TR decreases, thereby reducing the power loss of the TR1.
JP8237080A 1980-06-18 1980-06-18 Series control type transistor regulated power source circuit Pending JPS578819A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8237080A JPS578819A (en) 1980-06-18 1980-06-18 Series control type transistor regulated power source circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8237080A JPS578819A (en) 1980-06-18 1980-06-18 Series control type transistor regulated power source circuit

Publications (1)

Publication Number Publication Date
JPS578819A true JPS578819A (en) 1982-01-18

Family

ID=13772695

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8237080A Pending JPS578819A (en) 1980-06-18 1980-06-18 Series control type transistor regulated power source circuit

Country Status (1)

Country Link
JP (1) JPS578819A (en)

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