Patent US5949224A successfully refreshed from Google Patents.
US5949224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Buck boost switching regulator
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1998-08-05
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Granted: 1999-09-07
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Expires: 2018-08-05
Abstract
Abstract A buck boost switching regulator includes a buck switch and a boost switch controlled by a first and second comparator, respectively. The first comparator generates a duty cycle control signal for the buck switch in response to the difference between the regulator output voltage and a control voltage corresponding to a desired regulator output voltage. The second comparator generates a duty cycle control signal for the boost switch in response to a supply voltage.
Inventors
- 👤 Stefan Barkaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:31
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/158; H02M3/1582
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
89 words
A buck boost switching regulator comprising a buck switch and a boost switch, each having a duty cycle control input terminal connected to the output of a first and second comparator, respectively, the first comparator being adapted to generate a buck switch duty cycle control output signal in response to the difference between the regulator output voltage and a control voltage corresponding to a desired regulator output voltage, the second comparator being adapted to generate a boost switch duty cycle control output signal in response to a supply voltage.
Claim 2
Dependent Claim
89 words
A buck boost switching regulator comprising a buck switch and a boost switch, each having a duty cycle control input terminal connected to the output of a first and second comparator, respectively, the first comparator being adapted to generate a buck switch duty cycle control output signal in response to the difference between the regulator output voltage and a control voltage corresponding to a desired regulator output voltage, the second comparator being adapted to generate a boost switch duty cycle control output signal in response to a supply voltage.
Claim 3
Dependent Claim
88 words
The regulator as claimed in claim 1, wherein one input of both the first and the second comparator is connected to the output of a ramp generator for generating a recurrent ramp signal, that the other input of the first comparator is connected to the output of an amplifier for amplifying the difference between the regulator output voltage and the control voltage, and that the other input of the second comparator is connected to the output of an amplifier for amplifying the supply voltage to a desired level.
Claim 4
Dependent Claim
44 words
The regulator as claimed in claim 2, wherein the amplifier connected to the other input of the second comparator, is adapted to amplify the supply voltage to the most negative output voltage to be obtained from the regulator with the the buck switch off.
References Cited (Backward Citations)
US4245286A
Cited
US4395675A
Cited
US4578630A
Cited
US4692686A
Cited
US4716357A
Cited
US4733104A
Cited
US4801854A
Cited
US4736151A
Cited
US5402060A
Cited
US5528125A
Cited
US5602463A
Cited
US5714863A
Cited
US5847554A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-09-06 | 2003-03-08 | 2003-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-09-06 | 2007-03-08 | 2007-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-09-06 | 2011-03-08 | 2011-09-07 | $7700.00 | Window Closed / Lapsed |