H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/66
H05B 41/36 (2006.01) H05B 41/18 (2006.01)
Patent
CA 1144592
17 49,092 ABSTRACT OF THE DISCLOSURE Composite structure for use as an HID device ballast component and which performs the dual functions of voltage transformation and provision of ballasting react- ance which can be controllably shifted in value. A multi- leg magnetic structure has a primary winding carried on a first leg thereof and an output winding carried on a second leg thereof. A control winding is carried on a third leg and a gap of predetermined dimensions is pro- vided in the magnetic path which includes the third leg. The magnetic core member and the windings carried thereon display leakage flux paths of predetermined total per- meance. A bilateral switch connects to the control wind- ing and is operable to be closed once each half cycle of normal lamp operation. With the control winding closed, the counter mmf generated in the third leg decreases the inductive reactance of the structure by a predetermined amount, with the inductive reactance of the structure essentially established by the permeance of the leakage paths. With the control winding open, the inductive reactance of the structure is established both by the reactance of the wound third leg and the permeance of the leakage paths. Thus, the effective ballasting inductive reactance can be controllable varied between two predeter- mined values in order to control the performance of the ballasted device and the composite structure also provides voltage transformation.
380513
Mcconnell And Fox
Westinghouse Electric Corporation
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