US4772995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching supply with pulse width and rate modulation
Assignee: Veeco Instruments Inc
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Filing: 1987-01-08
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Granted: 1988-09-20
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Expires: 2007-01-08
Abstract
Abstract A switching type power supply is described which employs pulse width and rate modulation. Enhanced control range is achieved by controlling a frequency determining circuit to increase operating frequency as a function of power switch pulse width. The power switch controls the switching of primary current in a transformer whose secondary supplies the output via a rectifier/filter circuit.
Inventors
- 👤 George Gautherin
- 👤 Sol Greenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:27
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33507
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
A switching type power supply comprising a controllable switching device and an output circuit serially connected to a source to be regulated; pulse width regulator means responsive to the output of said output circuit for controlling the pulse width applied to said switching device; frequency control means controlled in accordance with said pulse width for extending the effect of said pulse width control by controlling the switching frequency of said device in relation to said pulse width such that the switching frequency increases as pulse width increases.
Claim 2
Dependent Claim
87 words
A switching type power supply comprising a controllable switching device and an output circuit serially connected to a source to be regulated; pulse width regulator means responsive to the output of said output circuit for controlling the pulse width applied to said switching device; frequency control means controlled in accordance with said pulse width for extending the effect of said pulse width control by controlling the switching frequency of said device in relation to said pulse width such that the switching frequency increases as pulse width increases.
Claim 3
Dependent Claim
21 words
A supply as defined in claim 1 in which said regulating means and frequency control means form a negative feedback loop.
Claim 4
Dependent Claim
29 words
A supply as defined in claim 1 in which said frequency control means are coupled to said switching device for deriving pulse width data used for said frequency control.
Claim 5
Dependent Claim
27 words
A supply as defined in claim 1 in which said frequency control means are coupled to said pulse width regulating means for controlling the base period thereof.
Claim 6
Dependent Claim
21 words
A supply as defined in claims 2, 3 or 4 in which said frequency control means comprise a time base generator.
Claim 7
Dependent Claim
158 words
A switching type power supply comprising a power transmitting transformer, switching means connected in series with the primary of said transformer, said primary and switching means being connected to a voltage source; an output circuit including rectifying and filtering means connected to a secondary of said transformer; error detector means responsive to the output of said output circuit for deriving a control signal related to changes in said output; switch control means responsive to said control signal and having a characteristic whereby changes in the amplitude of said control signal over the operating range of said supply produce changes in both the conduction time of said switching means and the operating frequency of said switching means; said switch control means including a pulse width modulating means for controlling the conduction time of said switching means and timing means to cause the operating frequency to increase as the pulse width increases and to decrease as the pulse width decreases.
Claim 8
Dependent Claim
158 words
A switching type power supply comprising a power transmitting transformer, switching means connected in series with the primary of said transformer, said primary and switching means being connected to a voltage source; an output circuit including rectifying and filtering means connected to a secondary of said transformer; error detector means responsive to the output of said output circuit for deriving a control signal related to changes in said output; switch control means responsive to said control signal and having a characteristic whereby changes in the amplitude of said control signal over the operating range of said supply produce changes in both the conduction time of said switching means and the operating frequency of said switching means; said switch control means including a pulse width modulating means for controlling the conduction time of said switching means and timing means to cause the operating frequency to increase as the pulse width increases and to decrease as the pulse width decreases.
References Cited (Backward Citations)
US4037271A
Cited
JPS5472446A
Cited
US4276586A
Cited
JPS5597183A
Cited
US4347559A
Cited
US4479174A
Cited
US4677534A
Cited
US4679131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |