Patent US5708573A successfully refreshed from Google Patents.
US5708573A
Expired / Lapsed
US
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Varactor controlled fixed frequency VHF DC-DC converter
Assignee: Raytheon Co
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Filing: 1996-02-01
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Granted: 1998-01-13
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Expires: 2016-02-01
Abstract
Abstract A DC to DC converter including a resonant switching circuit (13, 51 , 115, 151, 125, 153); an impedance matching circuit (53) responsive to the resonant switching circuit; a rectifier circuit (55) responsive to the impedance matching circuit; an output filter circuit (57) responsive to rectifier circuit for providing a filtered DC to DC converter voltage output; and a varactor diode circuit (27, 29, 31, 61) responsive to the filtered DC to DC converter voltage output for controlling the impedance matching circuit such that the filtered DC to DC converter output voltage is substantially constant.
Inventors
- 👤 David M. Lusher
- 👤 Wilbur E. Hong
- 👤 William B. Hwang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:51
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A VHF DC to DC converter comprising: resonant switching means connected between a supply voltage and ground, said switching means being driven with a periodic drive signal of a predetermined drive frequency; an impedance matching circuit responsive to said resonant switching means; rectifying means responsive to said impedance matching circuit; filtering means responsive to said rectifying meas for providing a filtered DC to DC converter voltage output; and a varactor diode circuit responsive to said filtered DC to DC converter voltage output for controlling said impedance matching circuit such that said filtered DC to DC converter output voltage is substantially constant.
Claim 2
Dependent Claim
101 words
A VHF DC to DC converter comprising: resonant switching means connected between a supply voltage and ground, said switching means being driven with a periodic drive signal of a predetermined drive frequency; an impedance matching circuit responsive to said resonant switching means; rectifying means responsive to said impedance matching circuit; filtering means responsive to said rectifying meas for providing a filtered DC to DC converter voltage output; and a varactor diode circuit responsive to said filtered DC to DC converter voltage output for controlling said impedance matching circuit such that said filtered DC to DC converter output voltage is substantially constant.
Claim 3
Dependent Claim
15 words
The DC to DC converter of claim 1 wherein said drive signal comprises a sinusoid.
Claim 4
Dependent Claim
20 words
The DC to DC converter of claim 1 wherein said resonant switching means includes a transistor and a resonant circuit.
Claim 5
Dependent Claim
20 words
The DC to DC converter of claim 1 wherein said bandpass filtering means is tuned to said predetermined drive frequency.
Claim 6
Dependent Claim
45 words
The DC to DC converter of claim 2 wherein said varactor diode circuit includes amplifier means responsive to said filtered DC to DC converter voltage output, a low pass filter responsive to said amplifier means, and a varactor diode responsive to said low pass filter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-12 | 2001-07-14 | 2002-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-12 | 2005-07-14 | 2006-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-12 | 2009-07-14 | 2010-01-13 | $7700.00 | Window Closed / Lapsed |