US3628160A
Expired / Lapsed
US
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Converter system
Assignee: RACAL-DANA INSTRUMENTS Inc
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Filing: 1969-12-22
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Granted: 1971-12-14
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Expires: 1989-12-22
Abstract
Abstract A system which may have applied thereto a DC or an AC signal and the output of which is a DC signal which follows substantially a predetermined function. The output signal is caused to follow substantially the predetermined function by application to the input signal of a dither signal which, under some circumstances, may be frequency modulated. In a preferred embodiment, the system is an AC to DC RMS converter utilizing operational rectifiers the output of which is applied to a dither generator which produces an output signal having a substantially linear probability distribution function (a triangular wave), and which output is applied as an input signal to the operational rectifiers to vary the conduction level thereof so as to cause the system output signal to more closely follow the square-law curve. In an alternative embodiment, comparators are used instead of operational rectifiers.
Inventors
- 👤 John R Pickering
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:21
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/005; G06; G06G; G06G7/00; G06G7/12; G06G7/26; G06G7/28
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
126 words
A system for converting an applied electrical input signal to a direct current output signal which, over the range of the input signal, follows a predetermined function comprising: converter means, including a plurality of operational rectifier means; conduction setting means connected to said converter means for establishing the conduction level of said converter means to provide an output signal having a straight line approximation of said function; a dither signal generator having a positive and negative going output signal having a predetermined linear distribution function; means connecting said dither generator output signal to said conduction setting means thereby to vary the conduction level of said converter means proportional to said dither generator output signal; and modulating means varying the frequency of said dither generator output signal.
Claim 2
Independent Claim
126 words
A system for converting an applied electrical input signal to a direct current output signal which, over the range of the input signal, follows a predetermined function comprising: converter means, including a plurality of operational rectifier means; conduction setting means connected to said converter means for establishing the conduction level of said converter means to provide an output signal having a straight line approximation of said function; a dither signal generator having a positive and negative going output signal having a predetermined linear distribution function; means connecting said dither generator output signal to said conduction setting means thereby to vary the conduction level of said converter means proportional to said dither generator output signal; and modulating means varying the frequency of said dither generator output signal.
Claim 3
Dependent Claim
16 words
A system as defined in claim 1 wherein said dither generator is a triangular wave generator.
Claim 4
Dependent Claim
16 words
A system as defined in claim 2 wherein said modulating means is a triangular wave generator.
Claim 5
Dependent Claim
18 words
A system as defined in claim 1 wherein said means connecting said dither generator include a feedback path.
Claim 6
Dependent Claim
16 words
A system as defined in claim 4 wherein said dither generator is a triangular wave generator.
Claim 7
Dependent Claim
31 words
A system as defined in claim 5 wherein said output signal of said triangular wave generator has a peak-to-peak amplitude substantially equal to the amplitude of said direct current output signal.
Claim 8
Independent Claim
100 words
A system for converting an applied electrical input signal to a direct current output signal which, over the range of the input signal, follows a predetermined function comprising: converter means, including a plurality of operational rectifiers each of which has a different conduction level; conduction setting means connected to said converter means for establishing the conduction level of said converter means to provide an output signal having a straight line approximation of said function; and feedback means including a dither generator connected between said output signal and said dither generator having an output signal having a predetermined linear distribution function.
Claim 9
Independent Claim
100 words
A system for converting an applied electrical input signal to a direct current output signal which, over the range of the input signal, follows a predetermined function comprising: converter means, including a plurality of operational rectifiers each of which has a different conduction level; conduction setting means connected to said converter means for establishing the conduction level of said converter means to provide an output signal having a straight line approximation of said function; and feedback means including a dither generator connected between said output signal and said dither generator having an output signal having a predetermined linear distribution function.
Claim 10
Dependent Claim
16 words
A system as defined in claim 7 wherein said dither generator is a triangular wave generator.
Claim 11
Dependent Claim
27 words
A system as defined in claim 8 wherein the peak-to-peak amplitude of said triangular wave is substantially equal to the amplitude of said direct current output signal.
Claim 12
Dependent Claim
23 words
A system as defined in claim 9 wherein said triangular wave generator includes ramp generator means referenced to said direct current output signal.
Claim 13
Independent Claim
94 words
A system for converting a time-varying complex electrical input signal to DC comprising: operational rectifier means; first feedback means connected to apply said DC to said operational rectifier means thereby to vary the conduction level of said rectifier means proportional to said DC and second feedback means, including a dither signal generator, the output signal of which is a periodically varying signal having a substantially linear probability function, connected between said DC and said operational rectifier means thereby to apply an amplitude varying signal to said rectifier to further vary said conduction level thereof.
Claim 14
Independent Claim
94 words
A system for converting a time-varying complex electrical input signal to DC comprising: operational rectifier means; first feedback means connected to apply said DC to said operational rectifier means thereby to vary the conduction level of said rectifier means proportional to said DC and second feedback means, including a dither signal generator, the output signal of which is a periodically varying signal having a substantially linear probability function, connected between said DC and said operational rectifier means thereby to apply an amplitude varying signal to said rectifier to further vary said conduction level thereof.
Claim 15
Dependent Claim
25 words
A system as defined in claim 11 wherein said dither generator further includes modulating means operatively connected to vary the frequency of said dither signal.
Claim 16
Dependent Claim
28 words
A system as defined in claim 1 wherein said conduction level of said rectifier means is established to cause said DC output to follow substantially a square-law curve.
Claim 17
Dependent Claim
16 words
A system as defined in claim 11 wherein said dither generator is a triangular wave generator.
Claim 18
Dependent Claim
27 words
A system as defined in claim 14 wherein the peak-to-peak amplitude of the output signal of said triangular wave generator is substantially equal to said DC amplitude.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |