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Patent US3875496A successfully refreshed from Google Patents.
US3875496A
Expired / Lapsed
US
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Static inverter using multiple signal control loops
Assignee: Glenayre Electronics Ltd
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Filing: 1974-03-13
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Granted: 1975-04-01
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Expires: 1994-03-13
Abstract
Abstract A static inverter for converting a direct current input signal to an alternating current output signal, the inverter including a series of control loops to insure a stable, constant amplitude sine wave output. The output sine wave is generated by comparing a high frequency triangle wave with a corrected reference sine wave, the output of the triangle wave comparator controlling the switching of conventional switching and filtering sections. The magnitude of the triangle wave is maintained proportional to the DC input signal, thereby maintaining the output sine wave relatively constant as the magnitude of the DC input signal varies. For control and regulation of the output, the AC signal present at the load is rectified, filtered and compared with a DC reference signal, the output of the DC comparator being used to proportionally adjust the amplitude of an AC reference sine wave. The amplitude adjusted reference sine wave is then compared with the output of the inverter to generate a signal representative of the distortion of the output, and this distortion signal is then summed with the amplitude adjusted reference sine wave to produce the corrected sine wave for application to the triangle wave comparator.
Inventors
- 👤 Bruce W Carsten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:08
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5387; H02M7/53871; H02M7/539
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
265 words
A static inverter for supplying a regulated AC output signal to a load from a DC input signal, comprising: means for generating an AC reference signal of predetermined magnitude; means for generating a signal having a triangle-like waveform of selected frequency higher than said AC reference signal; first circuit means, including means establishing a DC reference voltage and means for converting the AC output signal at the load to a corresponding DC voltage, which first circuit means adjust the magnitude of said reference signal in a manner proportional to the difference in magnitude between said converted AC output signal and said DC reference voltage; second circuit means for comparing said adjusted reference signal and the AC output signal, and for generating an error signal representative of the signal diffference therebetween; signal summing means connected to said first and second circuit means for producing a corrected reference signal which is the algebraic sum of said error signal and said adjusted reference signal; comparison means, responsive to said corrected reference signal and said signal having a triangle-like waveform, generating control signals whenever a predetermined relationship exists between said corrected reference signal and said triangle-like signal exists; switching and filtering means responsive to said control signals for converting the DC input signal to the AC output signal, said switching means intermittenly providing said filtering means with said DC input signal under the control of said control signals, generating a square wave thereby, said filtering means being responsive to said square wave to provide the AC output signal; and means for coupling said inverter output signal to the load.
Claim 2
Dependent Claim
265 words
A static inverter for supplying a regulated AC output signal to a load from a DC input signal, comprising: means for generating an AC reference signal of predetermined magnitude; means for generating a signal having a triangle-like waveform of selected frequency higher than said AC reference signal; first circuit means, including means establishing a DC reference voltage and means for converting the AC output signal at the load to a corresponding DC voltage, which first circuit means adjust the magnitude of said reference signal in a manner proportional to the difference in magnitude between said converted AC output signal and said DC reference voltage; second circuit means for comparing said adjusted reference signal and the AC output signal, and for generating an error signal representative of the signal diffference therebetween; signal summing means connected to said first and second circuit means for producing a corrected reference signal which is the algebraic sum of said error signal and said adjusted reference signal; comparison means, responsive to said corrected reference signal and said signal having a triangle-like waveform, generating control signals whenever a predetermined relationship exists between said corrected reference signal and said triangle-like signal exists; switching and filtering means responsive to said control signals for converting the DC input signal to the AC output signal, said switching means intermittenly providing said filtering means with said DC input signal under the control of said control signals, generating a square wave thereby, said filtering means being responsive to said square wave to provide the AC output signal; and means for coupling said inverter output signal to the load.
Claim 3
Dependent Claim
37 words
An apparatus of claim 1, wherein said coupling means includes a transformer means having primary and secondary windings, the AC output signal being applied to said primary winding, and said secondary winding being connected to the load.
Claim 4
Dependent Claim
14 words
An apparatus of claim 1, wherein said AC reference signal is a sine wave.
Claim 5
Dependent Claim
24 words
An apparatus of claim 1, wherein the frequency of said triangle-like wave is at least 100 times the frequency of said AC reference signal.
Claim 6
Dependent Claim
19 words
An apparatus of claim 4, wherein the frequency of said triangle wave is on the order of 20 kHz.
Claim 7
Dependent Claim
50 words
An apparatus of claim 1, wherein said converting means in said first circuit means includes rectifier and filtering means for developing a DC signal from the AC signal present at the load, and wherein said first circuit means includes means for comparing said DC signal with said reference DC signal.
Claim 8
Dependent Claim
44 words
An apparatus of claim 6, wherein said first circuit means further includes a variable gain amplifier connected to said AC reference signal means and responsive to the comparing means in said first circuit means for adjusting the amplitude of said AC reference signal accordingly.
Claim 9
Dependent Claim
51 words
An apparatus of claim 2, wherein said second circuit means includes means for sensing the signal present at said secondary winding, a comparator responsive to said sensing means and said variable gain amplifier, which comparator generates said error signal, and means for connecting said error signal to said signal summing means.
Claim 10
Dependent Claim
46 words
An apparatus of claim 1, including means connecting said DC input voltage to said triangle wave generating means, and further including means in said triangle-like wave generating means for controlling the magnitude of the triangle-like wave in proportion to the magnitude of the DC input voltage.
Claim 11
Dependent Claim
14 words
An apparatus of claim 9, wherein said AC reference signal is a sine wave.
Claim 12
Dependent Claim
24 words
An apparatus of claim 9, wherein the frequency of said triangle-like wave is at least 100 times the frequency of said AC reference signal.
Claim 13
Dependent Claim
19 words
An apparatus of claim 11, wherein the frequency of said triangle wave is on the order of 20 kHz.
Claim 14
Dependent Claim
53 words
An apparatus of claim 12, wherein said converting means in said first circuit means includes rectifier and filtering means for developing a DC signal from the AC signal present At the load, and wherein said first circuit means includes means for comparing said DC signal with said reference DC signal of selected magnitude.
Claim 15
Dependent Claim
44 words
An apparatus of claim 13, wherein said first circuit means further includes a variable gain amplifier connected to said AC reference signal means and responsive to the comparing means in said first circuit means for adjusting the amplitude of said AC reference signal accordingly.
Claim 16
Dependent Claim
37 words
An apparatus of claim 9, wherein said coupling means includes a tranformer means having primary and secondary windings, said inverter output signal being applied to said primary winding, and said secondary winding being connected to the load.
Claim 17
Dependent Claim
51 words
An apparatus of claim 9, wherein said second circuit means includes means for sensing the signal present at said secondary winding, a comparator responsive to said sensing means and said variable gain amplifier, which comparator generates said error signal, and means for applying said error signal to said signal summing means.
References Cited (Backward Citations)
US3278827A
Cited
US3624486A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |