US3768012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply current detector system
Assignee: Pioneer Magnetics Inc
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Filing: 1972-05-08
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Granted: 1973-10-23
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Expires: 1992-05-08
Abstract
Abstract A power supply current detector system is provided which includes the filter choke inductor of the power supply, and which uses the winding resistance of the filter choke as a current sensor. The system of the invention produces an output which is indicative of the power supply output current, and which can be used for overload detection, and other purposes.
Inventors
- 👤 B Wilkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:51
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/18; G01R19/20; H; H02; H02M; H02M1/00; H02M1/0003; H02M1/0009
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
In combination with a power supply for producing a direct current output current having a first lead and a second lead extending to a pair of output terminals across which a load is connected, and further having a filter circuit for filtering the current including an inductor choke having a first winding series connected with said first lead and having a second winding with one side connected to one side of said first winding and inductively coupled to said first winding; resistance means connecting the other side of said second winding to said second lead; and differential comparator means connected to the other side of said first winding and to the other side of said second winding for providing an output corresponding to said direct current output current.
Claim 2
Dependent Claim
128 words
In combination with a power supply for producing a direct current output current having a first lead and a second lead extending to a pair of output terminals across which a load is connected, and further having a filter circuit for filtering the current including an inductor choke having a first winding series connected with said first lead and having a second winding with one side connected to one side of said first winding and inductively coupled to said first winding; resistance means connecting the other side of said second winding to said second lead; and differential comparator means connected to the other side of said first winding and to the other side of said second winding for providing an output corresponding to said direct current output current.
Claim 3
Dependent Claim
19 words
The combination defined in claim 1, in which said first and second windings are wound as a common coil.
Claim 4
Dependent Claim
25 words
The combination defined in claim 1, in which said first and second windings are wound with materials having essentially the same temperature coefficients of resistance.
Claim 5
Dependent Claim
29 words
The combination defined in claim 1, in which the value of said resistance means is of the order of 100-10,000 times the value of the resistance of said load.
Claim 6
Dependent Claim
27 words
The combination defined in claim 4, in which the resistance of said second winding is of the order of 100-10,000 times the resistance of said first winding.
References Cited (Backward Citations)
US3028539A
Cited
US3427534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |