US4390813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer for driving Class D amplifier
Assignee: DIABLO LIGHTING Inc
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Filing: 1981-06-29
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Granted: 1983-06-28
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Expires: 2001-06-29
Abstract
Abstract In an electrodeless discharge lamp of the type including an ionizable medium within a sealed envelope capable of emitting radiant energy when subjected to a radio frequency field, an oscillator for generating an output signal at a given radio frequency, a Class D RF amplifier including first and second transistors responsive to the oscillator output signal, and an induction coil responsive to the output of the amplifier, the coil being positioned in close physical proximity to the medium in the envelope for coupling to the medium an electric field having a magnitude sufficient to initiate ionization of the medium and a magnetic field for maintaining the ionization, there is disclosed an improved transformer for driving the Class D amplifier which results in a significant decrease in power consumption. The oscillator output signal is connected to the primary winding of a transformer which includes a toroidal, magnetic core. The transistors of the RF amplifier are connected to secondary windings wound on the core. The core is split between the secondary windings to form a high reluctance path which isolates the secondary windings from each other and critically couples the primary winding and the secondary windings.
Inventors
- 👤 Charles A. Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:41
CPC Classifications
H; H01; H01F; H01F30/00; H01F30/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
50 words
In a transformer including a toroidal magnetic core, a primary winding on said core, and first and second secondary windings on said core, said primary and secondary windings being spaced around said core, the improvement wherein said core is split between said secondary windings to form a high reluctance path.
Claim 2
Dependent Claim
50 words
In a transformer including a toroidal magnetic core, a primary winding on said core, and first and second secondary windings on said core, said primary and secondary windings being spaced around said core, the improvement wherein said core is split between said secondary windings to form a high reluctance path.
Claim 3
Dependent Claim
60 words
In a transformer including a toroidal, magnetic core, a primary winding wound on said core, and first and second secondary windings on said core, said primary and secondary windings being spaced around said core, the improvement comprising: means for isolating said secondary windings from each other, said isolating means comprising: means forming a high reluctance path between said secondary windings.
Claim 4
Dependent Claim
60 words
In a transformer including a toroidal, magnetic core, a primary winding wound on said core, and first and second secondary windings on said core, said primary and secondary windings being spaced around said core, the improvement comprising: means for isolating said secondary windings from each other, said isolating means comprising: means forming a high reluctance path between said secondary windings.
Claim 5
Dependent Claim
28 words
In a transformer according to claim 2, the improvement wherein said means forming a high reluctance path comprises: a gap in said magnetic core, between said secondary windings.
Claim 6
Dependent Claim
16 words
In a transformer according to claim 3, the improvement wherein said gap is an air gap.
Claim 7
Dependent Claim
188 words
In an electrodeless discharge lamp of the type including an ionizable medium within a sealed envelope capable of emitting radiant energy when subjected to a radio frequency field, an oscillator for generating an output signal at a given radio frequency, a Class D RF amplifier including first and second transistors connected in series and adapted to be driven alternately on and off by said oscillator output signal, a transformer including a toroidal, magnetic core, a primary winding on said core responsive to said oscillator output signal, first and second secondary windings on said core coupled to said first and second transistors, respectively, said primary and secondary windings being spaced around said core, and an induction coil responsive to the output of said amplifier, said coil being positioned in close physical proximity to said medium in said envelope for coupling to said medium an electric field having a magnitude sufficient to initiate ionization of said medium and a magnetic field for maintaining said ionization, the improvement comprising: means for isolating said secondary windings from each other, said means comprising: means forming a high reluctance path between said secondary windings.
Claim 8
Dependent Claim
188 words
In an electrodeless discharge lamp of the type including an ionizable medium within a sealed envelope capable of emitting radiant energy when subjected to a radio frequency field, an oscillator for generating an output signal at a given radio frequency, a Class D RF amplifier including first and second transistors connected in series and adapted to be driven alternately on and off by said oscillator output signal, a transformer including a toroidal, magnetic core, a primary winding on said core responsive to said oscillator output signal, first and second secondary windings on said core coupled to said first and second transistors, respectively, said primary and secondary windings being spaced around said core, and an induction coil responsive to the output of said amplifier, said coil being positioned in close physical proximity to said medium in said envelope for coupling to said medium an electric field having a magnitude sufficient to initiate ionization of said medium and a magnetic field for maintaining said ionization, the improvement comprising: means for isolating said secondary windings from each other, said means comprising: means forming a high reluctance path between said secondary windings.
Claim 9
Dependent Claim
30 words
In an electrodeless discharge lamp according to claim 5, the improvement wherein said means forming a high reluctance path comprises: a gap in said magnetic core, between said secondary windings.
Claim 10
Dependent Claim
18 words
In an electrodeless discharge lamp according to claim 6, the improvement wherein said gap is an air gap.
Claim 11
Dependent Claim
72 words
In a transformer for use in driving an RF amplifier from an oscillator in an electrodeless discharge lamp including a toroidal, magnetic core, a primary winding wound on said core, and first and second secondary windings on said core, said primary and secondary windings being spaced around said core, the improvement comprising: means forming a gap in said magnetic core, between said secondary windings, for isolating said secondary windings from each other.
Claim 12
Dependent Claim
72 words
In a transformer for use in driving an RF amplifier from an oscillator in an electrodeless discharge lamp including a toroidal, magnetic core, a primary winding wound on said core, and first and second secondary windings on said core, said primary and secondary windings being spaced around said core, the improvement comprising: means forming a gap in said magnetic core, between said secondary windings, for isolating said secondary windings from each other.
Claim 13
Dependent Claim
16 words
In a transformer according to claim 8, the improvement wherein said gap is an air gap.
References Cited (Backward Citations)
US3230488A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-27 | 1986-12-27 | 1987-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-27 | 1990-12-27 | 1991-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-27 | 1994-12-27 | 1995-06-28 | $7700.00 | Window Closed / Lapsed |