Housing for electronic ballast
View Patent ↗An electronic housing assembly is formed with an environmental seal ( 20 ), EMI control ( 56 ) and a good thermal coupling ( 44, 46 ) made between enclosed hot electric components ( 48, 50 ) and an exterior heat sink ( 52, 54 ).
1. An electronic assembly comprising:
a housing having a first housing portion ( 10 ) and a second housing portion ( 12 ), said first housing portion ( 10 ) and said second housing portion ( 12 ) being substantially quadrangular in configuration and each including concave portions ( 14 , 16 );
a peripheral groove ( 18 ) formed in said second housing portion ( 12 );
an O-ring ( 20 ) positioned in said groove ( 18 );
a depending peripheral flange ( 22 ) formed on said first housing portion ( 10 ) for engaging said O-ring ( 20 ) when said portions are mated;
at least one first upstanding wall ( 24 ) formed in said first housing portion ( 10 ) and at least one second upstanding wall ( 26 ) formed in said second housing portion ( 12 ), said walls being in opposition to one another and defining a space therebetween;
a printed circuit board ( 28 ) positioned between said wall ( 24 ) in said first housing portion ( 10 ) and said wall ( 26 ) in said second housing portion ( 12 ), said printed circuit board ( 28 ) having first and second surfaces ( 30 , 32 );
a first peripheral electrical conductor ( 34 ) formed on said first surface ( 30 ) and a second peripheral electrical conductor ( 36 ) formed on said second surface ( 32 ) and in contact with said first upstanding wall ( 24 ) and said second upstanding wall ( 26 );
at least one electrical conductor ( 38 ) extending through said printed circuit board ( 28 ) and in electrical contact with said peripheral electrical conductors ( 34 , 36 ) formed on said first and second surfaces ( 30 , 32 ); and
a plurality of retainers ( 40 ) passing through said first half housing portion ( 10 ) and into said second housing portion ( 12 ),
whereby pressure is applied to said printed circuit board ( 28 ) for maintaining said printed circuit board ( 28 ) in its desired location and electromagnetic interference is suppressed by virtue of the contact between said peripheral electrical conductors ( 34 , 36 ) and said first and second halves housing portions ( 10 , 12 ), wherein said first peripheral electrical conductor ( 34 ) and said second peripheral electrical conductor ( 36 ) extend substantially about the entire periphery of said printed circuit board ( 28 ).
2. The electronic assembly of claim 1 wherein said printed circuit board ( 28 ) includes at least one heat generating component ( 42 ), said heat generating component ( 42 ) having thermal transferring media ( 44 , 46 ) placed between the component ( 42 ) and the printed circuit board ( 28 ).
3. The electronic assembly of claim 1 wherein said printed circuit board ( 28 ) includes electrical components ( 48 , 50 ) and said electrical components are isolated from said first and second housing portions by air gaps ( 52 , 54 ).
4. The electronic assembly of claim 1 wherein said printed circuit board ( 28 ) contains a ferrite component ( 56 ) comprising two ferrite portions ( 58 , 60 ), said ferrite portions ( 58 , 60 ) being joined together by a spring clip ( 62 ) that includes at least two leaf springs ( 64 ) in contact with a surface of one of said first housing portion ( 10 ) or said second housing portion ( 12 ).