JPS5741721A - Constant voltage power circuit - Google Patents

Constant voltage power circuit

Info

Publication number
JPS5741721A
JPS5741721A JP11745080A JP11745080A JPS5741721A JP S5741721 A JPS5741721 A JP S5741721A JP 11745080 A JP11745080 A JP 11745080A JP 11745080 A JP11745080 A JP 11745080A JP S5741721 A JPS5741721 A JP S5741721A
Authority
JP
Japan
Prior art keywords
voltage
output
vtph
vtpl
threshold
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
JP11745080A
Other languages
Japanese (ja)
Inventor
Masaaki Kamiya
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.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
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 Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP11745080A priority Critical patent/JPS5741721A/en
Publication of JPS5741721A publication Critical patent/JPS5741721A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/08—Regulating voltage or current wherein the variable is dc
    • G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
    • G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
    • G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
    • G05F3/24—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations wherein the transistors are of the field-effect type only
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Nonlinear Science (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

PURPOSE:To derease the number of elements and at the same time reduce the power consumption, by deciding the constant voltage output by the difference between two levels of threshold boltage plus the voltage dividing ratio caused by the resistance. CONSTITUTION:The levels of threshold voltage are different between a P-MOSFET 51 and a P-MOSFET52 that constitute a voltage comparator, and the output voltage of an output driving n-MOSFET55 which is controlled by the output of the above- mentioned comparator is directly applied to the gates. Otherwise, the voltage divided by resistances 56 and 57 is applied to those gates. FETs 53 and 54 constitute a current Miller circuit and thus work so as to ensure a coincidence between the currents I1 and I2. The output voltage Vout becomes equal to (Vtph-Vtpl)/(1-r), where (r) is the voltage dividing ratio and Vtph and Vtpl (Vtph>Vtpl) are the threshold voltage of the FETs 51 and 52, respectively.
JP11745080A 1980-08-26 1980-08-26 Constant voltage power circuit Pending JPS5741721A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11745080A JPS5741721A (en) 1980-08-26 1980-08-26 Constant voltage power circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11745080A JPS5741721A (en) 1980-08-26 1980-08-26 Constant voltage power circuit

Publications (1)

Publication Number Publication Date
JPS5741721A true JPS5741721A (en) 1982-03-09

Family

ID=14711947

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11745080A Pending JPS5741721A (en) 1980-08-26 1980-08-26 Constant voltage power circuit

Country Status (1)

Country Link
JP (1) JPS5741721A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59107560A (en) * 1982-12-13 1984-06-21 Hitachi Ltd Semiconductor integrated circuit device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59107560A (en) * 1982-12-13 1984-06-21 Hitachi Ltd Semiconductor integrated circuit device
JPH058584B2 (en) * 1982-12-13 1993-02-02 Hitachi Ltd

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