JPS57141727A - Multistage output power supply circuit - Google Patents

Multistage output power supply circuit

Info

Publication number
JPS57141727A
JPS57141727A JP2801281A JP2801281A JPS57141727A JP S57141727 A JPS57141727 A JP S57141727A JP 2801281 A JP2801281 A JP 2801281A JP 2801281 A JP2801281 A JP 2801281A JP S57141727 A JPS57141727 A JP S57141727A
Authority
JP
Japan
Prior art keywords
voltage vout
voltages
output
voltage
voltage vref
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
JP2801281A
Other languages
Japanese (ja)
Inventor
Tsunehide 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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP2801281A priority Critical patent/JPS57141727A/en
Publication of JPS57141727A publication Critical patent/JPS57141727A/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
    • G05F1/468—Regulating voltage or current wherein the variable actually regulated by the final control device is dc characterised by reference voltage circuitry, e.g. soft start, remote shutdown

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Voltage And Current In General (AREA)

Abstract

PURPOSE:To obtain many kinds of reference boltages with simple circuit constitution, by giving n (n>=2) sets of different reference voltages to a differential amplifier through switching additionally with n sets of external signals. CONSTITUTION:When an input voltage Vcc is switched with a transistor (TR) TR14, an output voltage Vout is obtained at the secondary side of a transformer 14. This voltage Vout is split with resistors r4 and r5, and the result is given to an inverting input of a differential amplifier 12, where the result is compared with a reference voltage Vref at a noninverting input, and the output pulse width of a pulse modulating circuit 13 is changed according to the difference to control a conduction angle of the TR14, and a prescribed output voltage Vout in response to the voltage Vref is obtained. In this case, the voltage Vout can be varied by varying the voltage Vref. Eight output voltages can be obtained through three bit-signals S1, S2 and S3 applied to the base of a TR11, a TR12 and a TR13 combined with three fererence voltages V1, V2 and V3, for example.
JP2801281A 1981-02-27 1981-02-27 Multistage output power supply circuit Pending JPS57141727A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2801281A JPS57141727A (en) 1981-02-27 1981-02-27 Multistage output power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2801281A JPS57141727A (en) 1981-02-27 1981-02-27 Multistage output power supply circuit

Publications (1)

Publication Number Publication Date
JPS57141727A true JPS57141727A (en) 1982-09-02

Family

ID=12236860

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2801281A Pending JPS57141727A (en) 1981-02-27 1981-02-27 Multistage output power supply circuit

Country Status (1)

Country Link
JP (1) JPS57141727A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59146318A (en) * 1983-02-09 1984-08-22 Usac Electronics Ind Co Ltd Voltage control circuit
WO1985004060A1 (en) * 1984-02-27 1985-09-12 Sundstrand Corporation Soft-start control for a push-pull converter-regulator with a flux balancing circuit
US4747012A (en) * 1986-01-10 1988-05-24 Murata Manufacturing Co., Ltd. Apparatus for supplying high and medium output voltages with a single transformer, having switchably variable feedback means for controlling the input current to the transformer
US5084666A (en) * 1990-10-23 1992-01-28 International Business Machines Corporation Switchable output voltage converter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5552117A (en) * 1978-10-11 1980-04-16 Fanuc Ltd Dc stabilized power supply unit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5552117A (en) * 1978-10-11 1980-04-16 Fanuc Ltd Dc stabilized power supply unit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59146318A (en) * 1983-02-09 1984-08-22 Usac Electronics Ind Co Ltd Voltage control circuit
WO1985004060A1 (en) * 1984-02-27 1985-09-12 Sundstrand Corporation Soft-start control for a push-pull converter-regulator with a flux balancing circuit
US4598351A (en) * 1984-02-27 1986-07-01 Sundstrand Corporation Soft-start control for a push-pull converter-regulator with a flux balancing circuit
US4747012A (en) * 1986-01-10 1988-05-24 Murata Manufacturing Co., Ltd. Apparatus for supplying high and medium output voltages with a single transformer, having switchably variable feedback means for controlling the input current to the transformer
US5084666A (en) * 1990-10-23 1992-01-28 International Business Machines Corporation Switchable output voltage converter

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