US4428018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low leakage filtered power supply
Assignee: HIGH STOY TECHNOLOGICAL Corp A CORP OF DE
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Filing: 1982-01-05
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Granted: 1984-01-24
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Expires: 2002-01-05
Abstract
Abstract An AC power supply system having transformer and filter structures. The electrical center of the filter section, which is normally connected to system ground, floats with respect to system ground and is connected to a center tap on the secondary winding of the transformer structure.
Inventors
- 👤 Steven Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:01
CPC Classifications
H; H03; H03H; H03H1/00; H03H1/0007; H02; H02H; H02H9/00; H02H9/005; H02H9/007; H03H7/00; H03H7/42; H03H7/425; H03H7/427
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
99 words
In an AC power supply system having a transformer structure that includes primary and secondary windings and a core, and a filter structure including capacitors and inductors, wherein said filter structure has an electrical center which is normally connected to system ground, the improvement for reducing leakage current with respect to system ground comprising a center tap on said secondary transformer winding connected to said electrical center of said filter structure, said transformer and filter structures being electrically isolated from system ground, in which said filter structure includes a conductive housing which is electrically connected to said center tap.
Claim 2
Dependent Claim
99 words
In an AC power supply system having a transformer structure that includes primary and secondary windings and a core, and a filter structure including capacitors and inductors, wherein said filter structure has an electrical center which is normally connected to system ground, the improvement for reducing leakage current with respect to system ground comprising a center tap on said secondary transformer winding connected to said electrical center of said filter structure, said transformer and filter structures being electrically isolated from system ground, in which said filter structure includes a conductive housing which is electrically connected to said center tap.
Claim 3
Dependent Claim
25 words
A power supply system as in claim 1, in which said transformer structure includes a conductive enclosure which is floating with respect to system ground.
Claim 4
Dependent Claim
28 words
A power supply system as in claim 2, in which said transformer and filter structures are mounted on a non-conductive plate which is electrically isolated from system ground.
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) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |