US4405976A
Expired / Lapsed
US
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Audio tracking pulse-width modulated power supply
Assignee: Boeing North American Inc
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Filing: 1981-12-16
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Granted: 1983-09-20
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Expires: 2001-12-16
Abstract
Abstract An audio signal tracking power converter has a master converter and a slave inverter which are connected in parallel to a dc power source that is to be converted and provide a first and second ac output signal. The first ac signal and the second ac signal are combined and converted to a dc signal that tracks the input audio signal. The master inverter is controlled by a free-running pulse generator which pulse-width modulates the first portion of the dc power that is converted to the first ac signal. The slave inverter is pulse-width modulated by pulses that result from the comparison of the audio signal that is to be tracked and a reference signal generated from the pulses from the free-running pulse generator.
Inventors
- 👤 Daniel M. Mitchell
- 👤 William J. Durspek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:51
CPC Classifications
H; H02; H02J; H02J1/00; H02J1/10; H02J1/102
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
111 words
An audio signal tracking power supply, comprising: master pulse generator means for generating master control pulses; slave pulse generator means, responsive to the audio signal, for generating slave control pulses; dc power supply means for providing dc power; master inverter means for inverting a first part of the dc power to a first ac signal, the master inverter means being controlled by the master control pulses; slave inverter means for inverting a second part of the dc power to a second ac signal, the slave inverter means being controlled by the slave control pulses; and output converter means for converting the first and second ac signals to a dc output signal.
Claim 2
Dependent Claim
111 words
An audio signal tracking power supply, comprising: master pulse generator means for generating master control pulses; slave pulse generator means, responsive to the audio signal, for generating slave control pulses; dc power supply means for providing dc power; master inverter means for inverting a first part of the dc power to a first ac signal, the master inverter means being controlled by the master control pulses; slave inverter means for inverting a second part of the dc power to a second ac signal, the slave inverter means being controlled by the slave control pulses; and output converter means for converting the first and second ac signals to a dc output signal.
Claim 3
Dependent Claim
64 words
The audio signal tracking power supply according to claim 1 wherein the master pulse generator means comprises: a free-running multivibrator means that operates at a preselected frequency for providing a first and second stream of pulses that are the complement of each other; and master inverter driver means for converting the second stream of pulses into pulses that the master inverter means will respond.
Claim 4
Dependent Claim
75 words
The audio signal tracking power supply according to claim 1 or 2 wherein the slave pulse generator means comprises: reference generator means for generating a reference signal; comparator means for comparing the reference signal to the audio signal and to provide a first logic pulse each time the audio signal exceeds the reference signal; and slave inverter driver means for converting the first logic pulse into a pulse that the slave inverter means will respond.
Claim 5
Dependent Claim
69 words
The audio signal tracking power supply according to claim 3 wherein the reference signal generator means comprises: a clock source means for providing a stream of clock pulses with a fixed duty cycle of a preselected on-time period and a preselected off-time period; and sawtooth generator means, synchronized by the stream of clock pulses, for providing a sawtooth signal whose amplitude increases with time during the preselected off-time period.
Claim 6
Dependent Claim
25 words
The audio signal tracking power supply according to claim 1 further comprising: synchronization means for synchronizing the slave control pulses with the master control pulses.
Claim 7
Dependent Claim
131 words
A combination of an audio signal source, an rf power amplifier, and a dc/dc power supply wherein the dc-to-dc power supply comprises: master pulse generator means for generating master control pulses; slave pulse generator means, responsive to an audio signal from the audio signal source, for generating slave control pulses; dc power supply means for providing dc power; master inverter means for inverting a first part of the dc power to a first ac signal, the master inverter means being controlled by the master control pulses; slave inverter means for inverting a second part of the dc power to a second ac signal, the slave inverter means being controlled by the slave control pulses; and output converter means for converting the first and second ac signals to a dc output signal.
Claim 8
Dependent Claim
131 words
A combination of an audio signal source, an rf power amplifier, and a dc/dc power supply wherein the dc-to-dc power supply comprises: master pulse generator means for generating master control pulses; slave pulse generator means, responsive to an audio signal from the audio signal source, for generating slave control pulses; dc power supply means for providing dc power; master inverter means for inverting a first part of the dc power to a first ac signal, the master inverter means being controlled by the master control pulses; slave inverter means for inverting a second part of the dc power to a second ac signal, the slave inverter means being controlled by the slave control pulses; and output converter means for converting the first and second ac signals to a dc output signal.
Claim 9
Dependent Claim
60 words
The combination according to claim 6 wherein the master pulse generator means comprises: a free-running multivibrator means that operates at a preselected frequency for providing a first and second stream of pulses that are the complement of each other; and master inverter driver means for converting the second stream of pulses into pulses that the master inverter means will respond.
Claim 10
Dependent Claim
74 words
The combination according to claim 7 wherein the slave pulse generator means comprises: referenced generator means for generating a reference signal from the first stream of pulses; comparator means for comparing the reference signal to the audio signal and to provide a first logic pulse each time the audio signal exceeds the reference signal; and slave inverter means for converting the first logic pulse into a pulse that the slave inverter means will respond.
Claim 11
Dependent Claim
41 words
The combination according to claim 8 wherein the reference signal generator means comprises: sawtooth generator means synchronized by the first stream of pulses for providing a sawtooth signal whose amplitude increses with time between pulses of the first stream of pulses.
Claim 12
Dependent Claim
21 words
The combination according to claim 6 further comprising: synchronizing means for synchronizing the slave control pulses with the master control pulses.
Claim 13
Independent Claim
84 words
A method for providing power to an rf power amplifier from a power supply that tracks an audio signal comprising: generating master control pulses; generating slave control pulses from the audio signal; providing dc power; inverting a first part of the dc power to a first ac signal with the master control pulses; inverting a second part of the dc power to a second ac signal with the slave control pulse; and converting the first and second ac signal to a dc output signal.
Claim 14
Independent Claim
84 words
A method for providing power to an rf power amplifier from a power supply that tracks an audio signal comprising: generating master control pulses; generating slave control pulses from the audio signal; providing dc power; inverting a first part of the dc power to a first ac signal with the master control pulses; inverting a second part of the dc power to a second ac signal with the slave control pulse; and converting the first and second ac signal to a dc output signal.
Claim 15
Dependent Claim
42 words
The method according to claim 11 wherein the step of generating master control pulses comprises: providing a first and second stream of pulses that are the complement of each other; and converting the second stream of pulses into the master control pulses.
Claim 16
Dependent Claim
55 words
The method according to claim 11 or 12 wherein the step of generating slave control pulses comprises; generating a reference signal; comparing the reference signal to the audio signal and provide a first logic pulse each time the audio signal exceeds the reference signal; and converting the first logic pulses into the slave control pulses.
Claim 17
Dependent Claim
55 words
The method according to claim 13 wherein the step of generating a reference signal comprises: providing a stream of clock pulses with a fixed duty cycle of a preselected on-time period and a preselected off-time period, and providing a sawtooth signal, synchronized by the clock pulses, whose amplitude increases with time during the off-time period.
Claim 18
Dependent Claim
21 words
The method according to claim 11 further comprising the step of: synchronizing the slave control pulses with the master control pulses.
References Cited (Backward Citations)
US3671846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |