US4013939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple feedback control apparatus for power conditioning equipment
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1974-12-30
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Granted: 1977-03-22
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Expires: 1994-12-30
Abstract
Abstract An improved feedback control system to govern the cyclic operation of the power switch of a non-dissipative power conditioning equipment. The apparatus includes two or three control loops working in unison. The first causes the output DC level to be compared with a reference, and the error amplified for control purposes. The second utilizes the AC component of the voltage across the output filter inductor or the current through the output filter capacitor, and the third loop senses the output transients.
Inventors
- 👤 John Biess
- 👤 Yuan Yu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:17
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
128 words
Control apparatus for power conditioning equipment, said equipment comprising selective switching means and an energy storage element, said energy storage element comprising a capacitor and an inductor having a power winding, said control apparatus comprising: first electrical means for sensing only the final output DC voltage of said equipment, second electrical means for sensing only the instantaneous dynamic energy level within said energy storage element, said second means comprising a signal winding on said inductor, amplification means, responsive to said first and second electrical means, said amplification means generating an output signal, threshold detection means to generate a control signal when the DC level of said amplification means output signal exceeds an established value, and controller means, responsive to said control signal, for selectively operating said switching means.
Claim 2
Dependent Claim
128 words
Control apparatus for power conditioning equipment, said equipment comprising selective switching means and an energy storage element, said energy storage element comprising a capacitor and an inductor having a power winding, said control apparatus comprising: first electrical means for sensing only the final output DC voltage of said equipment, second electrical means for sensing only the instantaneous dynamic energy level within said energy storage element, said second means comprising a signal winding on said inductor, amplification means, responsive to said first and second electrical means, said amplification means generating an output signal, threshold detection means to generate a control signal when the DC level of said amplification means output signal exceeds an established value, and controller means, responsive to said control signal, for selectively operating said switching means.
Claim 3
Dependent Claim
35 words
Control apparatus as recited in claim 1, wherein the input to said amplification means comprises the difference between a reference DC voltage level and the sum of the outputs from said first and second means.
Claim 4
Dependent Claim
53 words
Control apparatus as recited in claim 1, further including third electrical means for sensing the rate of change of the output from said equipment, the input to said amplification means being the difference between a reference DC voltage level and the sum of the outputs from said first, second and third electrical means.
Claim 5
Dependent Claim
14 words
Control apparatus as recited in claim 3, wherein said third means comprises a capacitor.
Claim 6
Dependent Claim
15 words
Control apparatus as recited in claim 1, wherein said controller means comprises a one-shot multivibrator.
Claim 7
Dependent Claim
16 words
Control apparatus as recited in claim 1, wherein said threshold detection means comprises a Schmitt trigger.
References Cited (Backward Citations)
US3320512A
Cited
US3378758A
Cited
US3356930A
Cited
US3585491A
Cited
US3602801A
Cited
US3626277A
Cited
US3665291A
Cited
US3675159A
Cited
US3772588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |