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US 4,613,841 AGranted
Integrated transformer and inductor
AssigneeGeneral Electric Company
InventorVictor D. Roberts
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AssigneeGeneral Electric Company
InventorVictor D. Roberts
Estimating the term…
An electrical transformer comprises a hollow form exhibiting high magnetic permeability and interior projections extending between separable halves of the form to provide a low magnetic leakage transformer core. Primary and secondary windings are disposed around the central projections. Furthermore, there is included means internal to the form for providing a lower permeability magnetic circuit shunt path. The internal shunt path means is typically either a cylinder or disc structure. A reduction in stray magnetic flux is desirable since it means that smaller, less expensive transformers may be constructed. The transformer of the present invention is particularly useful in electronic ballast circuits for gas discharge lamps because the magnetic shunt path acts as a current-limiting inductor. Moreover, since the transformers of the present invention do not generate external magnetic fields, flux shields are not required to maintain high efficiency.
An electrical transformer comprising:
An electrical ballast capable of performing as a transformer with a series inductor, for use with a gas discharge lamp to provide impedance matching and control of current supplied to said gas discharge lamp, said ballast comprising:
Dependencies are inferred from the claim text.