US3663949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current sensing of indicator current in series with transformer winding
Assignee: Bose Corp
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Filing: 1970-11-30
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Granted: 1972-05-16
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Expires: 1990-11-30
Abstract
Abstract In a two-state current-controlled system, a power switch is connected in series with the primary of a first transformer in series with an output inductor connected to the output terminal. The primary of a second transformer is connected in series with a diode connected to ground and the inductor. The secondaries of the first and second transformers are connected in series with respective controlled avalanche reset diodes that are connected to a current sensing resistance having its other end connected to ground so that the voltage across the current sensing resistance is representative of the current through the inductor.
Inventors
- 👤 Thomas A Froeschle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:46
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
Apparatus for sensing the current through an inductor comprising, at least first transformer means having primary winding means and a secondary winding means intercoupled by means including a ferromagnetic core, means for connecting said primary winding means in series with said inductor so that the same current that flows through said primary winding means also flows through said inductor, current sensing resistive means for providing a voltage thereacross representative Of the current through said inductor, a first unilaterally conducting device, and means for connecting said current sensing resistive means and said unilaterally conducting device in series with said secondary winding means.
Claim 2
Dependent Claim
101 words
Apparatus for sensing the current through an inductor comprising, at least first transformer means having primary winding means and a secondary winding means intercoupled by means including a ferromagnetic core, means for connecting said primary winding means in series with said inductor so that the same current that flows through said primary winding means also flows through said inductor, current sensing resistive means for providing a voltage thereacross representative Of the current through said inductor, a first unilaterally conducting device, and means for connecting said current sensing resistive means and said unilaterally conducting device in series with said secondary winding means.
Claim 3
Dependent Claim
100 words
Current sensing apparatus in accordance with claim 1 and further comprising, a second transformer means having primary winding means coupled to secondary winding means by means including a magnetic core, a second unilaterally conducting device, means for connecting the second transformer means primary winding means in series with said inductor, and means for connecting said second unilaterally conducting device in series with the second transformer secondary winding means and said current sensing resistive means, whereby the voltage across said current sensing resistive means is proportional to the sum of the currents in the first and second transformer primary winding means.
Claim 4
Dependent Claim
127 words
Current sensing apparatus in accordance with claim 2 and further comprising, a third unilaterally conducting device in series with said second transformer means primary winding means, a source of electrical energy, switching means in series with said electrical energy source and said first transformer means primary winding means for providing and interrupting current through the latter primary winding means when said switching means is closed and open respectively, said third unilaterally conducting means being poled to allow easy flow of current therethrough to said inductor substantially only when said switching means is open, whereby said first transformer primary winding means carries said inductor current when said switching means is closed and said second transformer primary winding means carries said inductor current when said switching means is open.
Claim 5
Dependent Claim
37 words
Current sensing apparatus in accordance with claim 3 wherein said first and second unilaterally conducting devices are poled to carry current in the easy flow direction when the primary winding of the associated transformer means carries current.
Claim 6
Dependent Claim
57 words
Apparatus in accordance with claim 4 wherein said first and second diode means are avalanching diodes having an avalanching voltage high enough to develop a voltage across the associated secondary winding means sufficiently high to permit reset of the associated magnetic core during the time interval shortly after current stops flowing in the associated primary winding means.
References Cited (Backward Citations)
US3461377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |