US5568035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable-capacitance power supply apparatus
Assignee: Tektronix Japan Corp
•
Filing: 1994-09-28
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Granted: 1996-10-22
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Expires: 2014-09-28
Abstract
Abstract A variable-capacitance power supply apparatus has an inexpensive structure for variably supplying a desired high power to a load by selecting an appropriate total capacitance for storing charge. A number "n" (an arbitrary integer) of series-coupled capacitors each having capacitance C are independently charged to produce an appropriate output voltage. The total capacitance Cs of the series-coupled capacitors is obtained as Cs=C/n. The total charge Q stored in the series-coupled capacitors is proportional to the total capacitance Cs. The series-coupled capacitors are selectively charged to produce an appropriate output voltage and the desired high power to be supplied to the load.
Inventors
- 👤 Katsuhisa Kato
- 👤 Toshihiko Onozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:27
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/06; H02M3/07
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
A power supply apparatus comprising: a plurality of series-coupled capacitors having one end thereof grounded and the other end coupled to an output terminal; means for independently charging each of the plurality of series-coupled capacitors; means for detecting a voltage across each of the plurality of capacitors; means for coupling the nodes between adjacent ones of the plurality of series-coupled capacitors to the output terminal; and means responsive to the voltages detected by the detecting means for controlling the charging means to produce an appropriate output power at the output terminal in accordance with a selected total capacitance of the plurality of series-coupled capacitors.
Claim 2
Dependent Claim
104 words
A power supply apparatus comprising: a plurality of series-coupled capacitors having one end thereof grounded and the other end coupled to an output terminal; means for independently charging each of the plurality of series-coupled capacitors; means for detecting a voltage across each of the plurality of capacitors; means for coupling the nodes between adjacent ones of the plurality of series-coupled capacitors to the output terminal; and means responsive to the voltages detected by the detecting means for controlling the charging means to produce an appropriate output power at the output terminal in accordance with a selected total capacitance of the plurality of series-coupled capacitors.
Claim 3
Dependent Claim
65 words
The power supply apparatus as recited in claim 1, wherein the coupling means comprises a plurality of diodes, the anodes thereof coupled to the respective nodes between adjacent ones of the series-coupled capacitors and the cathodes thereof coupled together and to the other end of the plurality of series-coupled capacitors, and a switch circuit between the common cathodes of the diodes and the output terminal.
Claim 4
Dependent Claim
34 words
The power supply apparatus as recited in claim 2, wherein the coupling means further comprises an additional diode coupled between the other end of the series-coupled capacitors and the common cathodes of the diodes.
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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) | 1999-10-22 | 2000-04-22 | 2000-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-22 | 2004-04-22 | 2004-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-22 | 2008-04-22 | 2008-10-22 | $7700.00 | Window Closed / Lapsed |