JPS57143617A - Serial control type constant voltage circuit - Google Patents

Serial control type constant voltage circuit

Info

Publication number
JPS57143617A
JPS57143617A JP2847981A JP2847981A JPS57143617A JP S57143617 A JPS57143617 A JP S57143617A JP 2847981 A JP2847981 A JP 2847981A JP 2847981 A JP2847981 A JP 2847981A JP S57143617 A JPS57143617 A JP S57143617A
Authority
JP
Japan
Prior art keywords
voltage
circuit
output terminal
constant voltage
reference voltage
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
JP2847981A
Other languages
Japanese (ja)
Inventor
Yoshitomo Kuwamoto
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 JP2847981A priority Critical patent/JPS57143617A/en
Publication of JPS57143617A publication Critical patent/JPS57143617A/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 protect a constant voltage circuit and a load circuit when a load is short-circuited by connecting a diode between a reference voltage generating circuit and an output terminal, and stopping the operation of the constant voltage circuit by lowering a reference voltage when the output voltage of the constant voltage circuit drops below a prescribed value. CONSTITUTION:A voltage drop controlling trasisitor TR1 is connected between an input terminal 8 and an output terminal 9. Further, a reference voltage generating circuit 3 which sets the level of an output terminal voltage, and a voltage comparator 2 which controls the TR1 by comparing a reference voltage obtained from the circuit 3 with a voltage proportional to the output terminal voltage are provided. Furthermore, a diode 5 is connected between the circuit 3 and the output terminal 9 and when the output terminal voltage drops below a prescribed voltage, the diode 5 turns on to set the reference voltage nearly equal to the current output terminal voltage.
JP2847981A 1981-03-02 1981-03-02 Serial control type constant voltage circuit Pending JPS57143617A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2847981A JPS57143617A (en) 1981-03-02 1981-03-02 Serial control type constant voltage circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2847981A JPS57143617A (en) 1981-03-02 1981-03-02 Serial control type constant voltage circuit

Publications (1)

Publication Number Publication Date
JPS57143617A true JPS57143617A (en) 1982-09-04

Family

ID=12249782

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2847981A Pending JPS57143617A (en) 1981-03-02 1981-03-02 Serial control type constant voltage circuit

Country Status (1)

Country Link
JP (1) JPS57143617A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006039812A (en) * 2004-07-26 2006-02-09 Nec Electronics Corp Dc stabilized power supply circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006039812A (en) * 2004-07-26 2006-02-09 Nec Electronics Corp Dc stabilized power supply circuit
JP4550506B2 (en) * 2004-07-26 2010-09-22 ルネサスエレクトロニクス株式会社 DC stabilized power supply circuit

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