JPS5739427A - Constant-voltage circuit - Google Patents

Constant-voltage circuit

Info

Publication number
JPS5739427A
JPS5739427A JP11387180A JP11387180A JPS5739427A JP S5739427 A JPS5739427 A JP S5739427A JP 11387180 A JP11387180 A JP 11387180A JP 11387180 A JP11387180 A JP 11387180A JP S5739427 A JPS5739427 A JP S5739427A
Authority
JP
Japan
Prior art keywords
varied
variation
current
bias current
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
JP11387180A
Other languages
Japanese (ja)
Inventor
Toru Takahashi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP11387180A priority Critical patent/JPS5739427A/en
Publication of JPS5739427A publication Critical patent/JPS5739427A/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
    • G05F1/562—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 with a threshold detection shunting the control path of the final control device

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 obtain more stabilized output voltage, by holding once the influence by a variation of supply voltage and a load current, in the form of a variation of a bias current of a pnp transistor. CONSTITUTION:A current of a resistance R3 is varied by a variation of supply voltage Vcc, but it is a bias current of a pnp transistor Q3 that is varied by said variation, its forward direction voltage VBEQ3 is scarcely varied, for instance, even when a current is varied to two times, its variation is 20mV or so, if so much, therefore, a variation of a bias current of Q1 flowing in a resistance R4 by VBEQ3 is only 2.5% or so, and reference voltage VBEQ1 is scarcely varied. Also, an increase of a Q2 base current causes a decrease of a bias current of Q3, is scarcely varied, therefore, since a bias current of Q1 is not varied and the reference voltage VBEQ1 is not varied, stability of output voltage againt a variation of a load current is greatly improved.
JP11387180A 1980-08-19 1980-08-19 Constant-voltage circuit Pending JPS5739427A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11387180A JPS5739427A (en) 1980-08-19 1980-08-19 Constant-voltage circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11387180A JPS5739427A (en) 1980-08-19 1980-08-19 Constant-voltage circuit

Publications (1)

Publication Number Publication Date
JPS5739427A true JPS5739427A (en) 1982-03-04

Family

ID=14623193

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11387180A Pending JPS5739427A (en) 1980-08-19 1980-08-19 Constant-voltage circuit

Country Status (1)

Country Link
JP (1) JPS5739427A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS531633B1 (en) * 1975-10-08 1978-01-20
JPS53131457A (en) * 1977-04-20 1978-11-16 Matsushita Electric Ind Co Ltd Constant voltage circuit
JPS5517217U (en) * 1978-07-21 1980-02-02
JPS5517407A (en) * 1978-07-24 1980-02-06 Toshiba Corp Detector for vapor leakage position

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS531633B1 (en) * 1975-10-08 1978-01-20
JPS53131457A (en) * 1977-04-20 1978-11-16 Matsushita Electric Ind Co Ltd Constant voltage circuit
JPS5517217U (en) * 1978-07-21 1980-02-02
JPS5517407A (en) * 1978-07-24 1980-02-06 Toshiba Corp Detector for vapor leakage position

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