US4816739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
DC/DC converter
Assignee: Motorola Solutions Japan Ltd
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Filing: 1988-08-15
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Granted: 1989-03-28
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Expires: 2008-08-15
Abstract
Abstract A first converter which includes a switching element operating on a comparatively lower threshold voltage and generating a first output voltage, a second converter which includes a switching element operating on a threshold voltage higher than that of the first conversion unit and generating a second output voltage higher than the first output voltage, and a level shift circuit which provides the switching signal for activating the switching element of the second converter in accordance with generation of the first output voltage.
Inventors
- 👤 Tadashi Sakurai
- 👤 Masahiro Kojima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:35
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/158; H02M3/1584
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
A DC/DC converter comprising a first DC/DC conversion unit including a switching element operating on a comparatively low threshold voltage and generating a first output voltage, a second DC/DC conversion unit including a switching element operating on a threshold voltage higher than that of said first conversion unit and generating a second output voltage higher than the first output voltage, and a level shift circuit connected to receive the first output voltage and providing a switching signal to the switching element of said second DC/DC conversion unit for the operation of said second conversion unit in accordance with generation of the first output voltage.
Claim 2
Dependent Claim
104 words
A DC/DC converter comprising a first DC/DC conversion unit including a switching element operating on a comparatively low threshold voltage and generating a first output voltage, a second DC/DC conversion unit including a switching element operating on a threshold voltage higher than that of said first conversion unit and generating a second output voltage higher than the first output voltage, and a level shift circuit connected to receive the first output voltage and providing a switching signal to the switching element of said second DC/DC conversion unit for the operation of said second conversion unit in accordance with generation of the first output voltage.
Claim 3
Dependent Claim
48 words
A DC/DC converter according to claim 1, wherein said level shift circuit, in response to the second output voltage generated from the second DC/DC conversion unit exceeding a predetermined value, provides the level shift operation based on the second output voltage in place of the first output voltage.
Claim 4
Dependent Claim
47 words
A DC/DC converter according to claim 1 wherein the first DC/DC conversion unit includes a shut-down circuit coupled to receive the second output voltage and which suspends operation of the first DC/DC conversion unit after the second output voltage is provided from the second DC/DC conversion unit.
Claim 5
Dependent Claim
58 words
A DC/DC converter according to claim 1 including in addition a common oscillation source having an output connected to each of the switching elements of the first and second DC/DC conversion units and wherein each switching element of the first and second DC/DC conversion units performs the switching operation with a signal supplied from the common oscillation source.
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) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |