JPS5732104A - Power-voltage-controlled type amplifier - Google Patents

Power-voltage-controlled type amplifier

Info

Publication number
JPS5732104A
JPS5732104A JP10716080A JP10716080A JPS5732104A JP S5732104 A JPS5732104 A JP S5732104A JP 10716080 A JP10716080 A JP 10716080A JP 10716080 A JP10716080 A JP 10716080A JP S5732104 A JPS5732104 A JP S5732104A
Authority
JP
Japan
Prior art keywords
voltage
output
power
amplifier
fet50
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
JP10716080A
Other languages
Japanese (ja)
Inventor
Harushige Nakagaki
Nobutaka Amada
Shigeki Inoue
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 JP10716080A priority Critical patent/JPS5732104A/en
Publication of JPS5732104A publication Critical patent/JPS5732104A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H03F1/0216—Continuous control
    • H03F1/0222—Continuous control by using a signal derived from the input signal
    • H03F1/0227—Continuous control by using a signal derived from the input signal using supply converters

Abstract

PURPOSE:To eliminate the need to use more than one transformer by controlling the power voltage of an output amplifier by connecting a switch element in series to a DC power source, by comparing its output with an input signal to an output amplifier through a low-pass filter, and by turning on and off the switch element on the basis of the comparison output. CONSTITUTION:A fixed DC voltage obtained through a commercial transformer 46 and insulated from an AC power source side is brought under the chopper control of switches 38 and 43, and an amplifier power voltage (e) is varied following up an input signal (ei). When the power voltage of an output terminal 10 drops below the reference voltage of a voltage comparator 41, an FET50 as a main switch is turned on and a voltage passed through a smoothing circuit 39, i.e. the voltage of the output 10 rises gradually. When it reaches a potential exceeding the reference voltage of the voltage comparator 41, the output voltage of the voltage comparator 41 is made negative and an FET51 turns off to turn of the FET50.
JP10716080A 1980-08-06 1980-08-06 Power-voltage-controlled type amplifier Pending JPS5732104A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10716080A JPS5732104A (en) 1980-08-06 1980-08-06 Power-voltage-controlled type amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10716080A JPS5732104A (en) 1980-08-06 1980-08-06 Power-voltage-controlled type amplifier

Publications (1)

Publication Number Publication Date
JPS5732104A true JPS5732104A (en) 1982-02-20

Family

ID=14452008

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10716080A Pending JPS5732104A (en) 1980-08-06 1980-08-06 Power-voltage-controlled type amplifier

Country Status (1)

Country Link
JP (1) JPS5732104A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4831334A (en) * 1987-06-08 1989-05-16 Hughes Aircraft Company Envelope amplifier
EP0483094A2 (en) * 1990-10-26 1992-04-29 AB LAB. GRUPPEN ANDERSSON & BÄVHOLM A pulse-width modulated, linear audio-power amplifier

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS524757A (en) * 1975-07-01 1977-01-14 Sansui Electric Co Amplifier

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS524757A (en) * 1975-07-01 1977-01-14 Sansui Electric Co Amplifier

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4831334A (en) * 1987-06-08 1989-05-16 Hughes Aircraft Company Envelope amplifier
EP0483094A2 (en) * 1990-10-26 1992-04-29 AB LAB. GRUPPEN ANDERSSON & BÄVHOLM A pulse-width modulated, linear audio-power amplifier
US5200711A (en) * 1990-10-26 1993-04-06 AB Lab. Gruppen Andersson & Bavholm Pulse-width modulated, linear audio-power amplifier

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