Patent US4839786A successfully refreshed from Google Patents.
US4839786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
DC-DC converter
Assignee: MINICAM RESEARCH Corp
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Filing: 1988-10-07
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Granted: 1989-06-13
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Expires: 2008-10-07
Abstract
Abstract A DC-DC converter of simple arrangement that effectively utilizes a negative voltage to improve loss of power. This DC-DC converter is suitable as a dc power source for an electronic flash of a camera.
Inventors
- 👤 Ichirho Ohosuga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:35
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
192 words
A DC-DC converter comprising: (a) oscillator means being oscillated by a dc power source; (b) rectifying circuit means for rectifying an output signal from said oscillator means; (c) fly-wheel diode means connected between a first output terminal of said rectifying circuit means and a second output terminal thereof; (d) first series circuit means formed of capacitor means and first reverse-blocking diode means, said first series circuit means being connected between said first output terminal of said rectifying circuit means and said second output terminal thereof; (e) second series circuit means formed of choke coil means and second reverse-blocking diode means, said second series circuit means being connected between said first output terminal of said rectifying circuit means and a first output terminal of the DC-DC converter; (f) third reverse-blocking means connected between a junction of said capacitor means with said first reverse-blocking diode means and said first output terminal of said DC-DC converter, a second output terminal of said DC-DC converter being led out from said second output terminal of said rectifying circuit means; and (g) smoothing capacitor means being connected between said first and second output terminal of said DC-DC converter.
Claim 2
Dependent Claim
192 words
A DC-DC converter comprising: (a) oscillator means being oscillated by a dc power source; (b) rectifying circuit means for rectifying an output signal from said oscillator means; (c) fly-wheel diode means connected between a first output terminal of said rectifying circuit means and a second output terminal thereof; (d) first series circuit means formed of capacitor means and first reverse-blocking diode means, said first series circuit means being connected between said first output terminal of said rectifying circuit means and said second output terminal thereof; (e) second series circuit means formed of choke coil means and second reverse-blocking diode means, said second series circuit means being connected between said first output terminal of said rectifying circuit means and a first output terminal of the DC-DC converter; (f) third reverse-blocking means connected between a junction of said capacitor means with said first reverse-blocking diode means and said first output terminal of said DC-DC converter, a second output terminal of said DC-DC converter being led out from said second output terminal of said rectifying circuit means; and (g) smoothing capacitor means being connected between said first and second output terminal of said DC-DC converter.
Claim 3
Dependent Claim
22 words
A DC-DC converter as claimed in claim 1, wherein said capacitor means of said first series circuit means is a non-polarized capacitor.
Claim 4
Dependent Claim
25 words
A DC-DC converter as claimed in claim 2, wherein said non-polarized capacitor has a withstanding voltage of 510 volts and a capacitance of 120 microfarads.
References Cited (Backward Citations)
SU613464A1
Cited
US4286314A
Cited
JPS58130771A
Cited
US4566051A
Cited
SU1171921A1
Cited
US4783727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |