JPS57101914A - Electric power supplying circuit - Google Patents

Electric power supplying circuit

Info

Publication number
JPS57101914A
JPS57101914A JP17837480A JP17837480A JPS57101914A JP S57101914 A JPS57101914 A JP S57101914A JP 17837480 A JP17837480 A JP 17837480A JP 17837480 A JP17837480 A JP 17837480A JP S57101914 A JPS57101914 A JP S57101914A
Authority
JP
Japan
Prior art keywords
voltage
collector
diode
prescribed
input
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
JP17837480A
Other languages
Japanese (ja)
Inventor
Michio Kono
Tomoo Suzuki
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 JP17837480A priority Critical patent/JPS57101914A/en
Publication of JPS57101914A publication Critical patent/JPS57101914A/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

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 prevent the thermal runaway of a transistor, by holding the collector-emitter voltage of a control transistor at a constant state, in case when input voltage has risen to a prescribed value or above, or output voltage has dropped to a prescribed value or below. CONSTITUTION:A clamping Zener diode D1 is connected between the base and the collector of a transistor TRTR1. Said diode D1 is off when input voltage V1 is a prescribed value or below, and is controlled so that output voltage V0 becomes constant. When the input voltage V1 attains to prescribed voltage above, the diode D1 turns on, and a current from an input terminal 1 flows through the diode D1, by which collector-emitter voltage VCE of TRTR1 is clamped. As for the voltage VCE, even if the input voltage V1 has risen to prescribed voltage or above, the collector-emitter voltage VCE becomes constant, and the output voltage V0 rises in accordance with the voltage V1.
JP17837480A 1980-12-17 1980-12-17 Electric power supplying circuit Pending JPS57101914A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17837480A JPS57101914A (en) 1980-12-17 1980-12-17 Electric power supplying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17837480A JPS57101914A (en) 1980-12-17 1980-12-17 Electric power supplying circuit

Publications (1)

Publication Number Publication Date
JPS57101914A true JPS57101914A (en) 1982-06-24

Family

ID=16047368

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17837480A Pending JPS57101914A (en) 1980-12-17 1980-12-17 Electric power supplying circuit

Country Status (1)

Country Link
JP (1) JPS57101914A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6020621U (en) * 1983-07-15 1985-02-13 日本電子株式会社 Coil power supply circuit for magnetic field generation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6020621U (en) * 1983-07-15 1985-02-13 日本電子株式会社 Coil power supply circuit for magnetic field generation

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