US4447791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply changeover type power amplifier
Assignee: Nippon Gakki Co Ltd
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Filing: 1982-06-07
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Granted: 1984-05-08
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Expires: 2002-06-07
Abstract
Abstract In a power supply changeover type amplifier arranged so that the voltages supplied from a plurality of power supplies to a power amplifying circuit are varied in accordance with the magnitude of level of an input signal which is to be amplified, arrangement is provided so that the plurality of power supplies having mutually equal output voltages are connected together in parallel and/or in series in accordance with the magnitude of the level of the input signal, and that the voltages resulting from the connection are supplied to the power amplifying circuit, to thereby enhance power efficiency of the amplifier and materialize its power supply section having a compact size and a light weight.
Inventors
- 👤 Masao Noro
- 👤 Yoshiki Kasahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:32
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0211; H03F1/0244; H03F3/00; H03F3/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
130 words
A power supply changeover type amplifier, comprising: power amplifying circuit means for power-amplifying a signal inputted to its input terminal; a plurality of power supplies for supplying power supply voltages to said power amplifying circuit means; and changeover circuit means for changing over voltages supplied to said power amplifying circuit means from said plurality of power supplies, in accordance with a level of said signal to be power-amplified in said power amplifying circuit means; said plurality of power supplies outputting voltages which are equal in level to each other, and said changeover circuit means connecting said plurality of power supplies together in series and/or in parallel to form certain voltage by those voltages supplied by the plurality of power supplies and supply the certain voltage to said power amplifying circuit.
Claim 2
Dependent Claim
130 words
A power supply changeover type amplifier, comprising: power amplifying circuit means for power-amplifying a signal inputted to its input terminal; a plurality of power supplies for supplying power supply voltages to said power amplifying circuit means; and changeover circuit means for changing over voltages supplied to said power amplifying circuit means from said plurality of power supplies, in accordance with a level of said signal to be power-amplified in said power amplifying circuit means; said plurality of power supplies outputting voltages which are equal in level to each other, and said changeover circuit means connecting said plurality of power supplies together in series and/or in parallel to form certain voltage by those voltages supplied by the plurality of power supplies and supply the certain voltage to said power amplifying circuit.
Claim 3
Dependent Claim
54 words
A power supply changeover type amplifier according to claim 1, in which: said plurality of power supplies contain unidirectional semiconductor devices connected between electrodes of a same polarity of the adjacently disposed power supplies, and also contain said changeover circuit means connected between electrodes of mutually different polarities of said adjacently disposed power supplies.
Claim 4
Dependent Claim
37 words
A power supply changeover type amplifier according to claim 2, further comprising: a controlling circuit means for controlling said changeover circuit means in accordance with a level of said signal amplified in said power amplifying circuit means.
Claim 5
Dependent Claim
42 words
A power supply changeover type amplifier according to claim 3, in which: said controlling circuit means contains a comparing means for comparing a level of said signal amplified in said power amplifying circuit means with a level of a predetermined voltage level.
Claim 6
Dependent Claim
39 words
A power supply changeover type amplifier according to claim 4, in which: said changeover circuit means is comprised of a switch means which is made or broken in accordance with a result of comparison done by said comparing means.
Claim 7
Dependent Claim
42 words
A power supply changeover type amplifier according to claim 4, in which: said changeover circuit means is comprised of an amplifying semiconductor device which is controlled of its condition degree in accordance with a result of comparison done by said comparing means.
Claim 8
Dependent Claim
38 words
A power supply changeover type amplifier according to claim 6, in which: said comparing means outputs a signal of a magnitude corresponding to a level of said signal when the level of said signal exceeds a predetermined value.
Claim 9
Dependent Claim
23 words
A power supply changeover type amplifier according to claim 1, in which: said certain voltages are each able to assume two different values.
Claim 10
Dependent Claim
36 words
A power supply changeover type amplifier according to claim 1, in which: said certain voltages each can vary their values stepwise in accordance with a level of said signal amplified in said power amplifying circuit means.
Claim 11
Dependent Claim
72 words
A power supply changeover type amplifier according to claim 9, in which: said certain voltage is able to assume three or more values obtained in accordance with both arbitrary number of power supplies among said plurality of power supplies which are connected in series by virtue of a changeover action of said changeover circuit means and the number of remaining ones of said plurality of power supplies which are connected in parallel.
Claim 12
Dependent Claim
25 words
A power supply changeover type amplifier according to claim 1, in which: said plurality of power supplies are each comprised of two power supply system.
Claim 13
Dependent Claim
28 words
A power supply changeover type amplifier according to claim 11, in which: said changeover circuit means is provided in plural number corresponding to power supplies of respective polarities.
References Cited (Backward Citations)
US4329657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |