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Repairable fluorescent lamp ballast
| Details |
Inventors: Petrina, Robert J.;
Assignee: Bruce Industries, Inc. (Gardena, CA)
Primary Examiner: Tolin; G. P.
Assistant Examiner:
Attorney, Agent or Firm: Siegemund; Ralf H.
A ballast coil, transformer, and power factor capacitor are plug-in mounted on a PC-board which is mounted into a frame being covered to provide a complete, unpotted enclosure. The transformer and the coil are additionally fastened to the enclosure and the board, and additional heat dissipation is provided for. Several different examples are enclosed for toroidal and laminated core structures and different capacitor positions. The capacitor is retained additionally by a strap which is screwed to one or both of the inductive elements. Additional fastening and heat dissipation is combined in toroidal inductances, by using a central post traversing the board and screw, and being fastened to a cover wall. |
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DETAILED DESCRIPTION I claim: 1.
A repairable ballast for fluorescent lamps, the ballast including at least one transformer, ballast coil means and capacitor means, and a support and mounting structure, comprising: a metal, frame-like housing; a metal cover on the housing and defining therewith a complete enclosure; a printed circuit board having a plurality of sockets, the transformer, the coil means, and the capacitor means being provided with pins and being removably inserted respectively in the sockets of the plurality, the circuit board being mounted to the housing, becoming thereby part of said enclosure; threaded means for additionally releasably securing the transformer and the coil means to the enclosure; supplemental releasable means disposed for holding the capacitor means in place; thermal conduction means in physical engagement with the coil means and the transformer, and in physical and releasable engagement with the surface portion of a metallic part of the enclosure; and the coil means, the capacitor means, and the transformer being directly removable upon release of the threaded means by unplugging them from the board, the enclosure not being filled with any potting material.
2.
The structure as in claim 1, said supplemental means being a retainer plate, releasably secured to, at least, one of the transformer and the ballast coil.
3.
The structure as in claim 1, said thermal conductor means being pad means, engaging the coil means, the transformer and the metal cover, the metal cover serving as a heat sink.
4.
The structure as in claim 1, the transformer and the coil means being each of toroidal configuration, each having a cylindrical opening accordingly, the thermal conduction means and the fastening means including for each of the transformers and the coil means a thermally conductive post inserted into the cylindrical opening, and having a head screwed to the metal frame.
5.
The structure as in claim 4, the printed circuit board having openings fully traversed by the heads
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