US 5,635,775 A · Printed circuit board mount electro-magnetic interference suppressor

Abstract

An electro-magnetic interference suppressor includes a segmented array of ceramic feed-through capacitors, and a conductive fence which is attached to the capacitor array about its periphery. The fence is attached to a ground of a printed circuit board such that a generally planar surface of the segmented array lies adjacent to a planar surface of the printed circuit board. The suppressor provides an effective filter for eliminating unwanted noise occurring in electronic circuitry. The fence, in one embodiment, is surface mounted and soldered to a surface ground pad of the printed circuit board. In another embodiment, the fence includes a ground pin which extends into printed circuit board for contact with the circuit board ground. The ground pin may be soldered in place or may include a compliant section for press-fit reception within a through-hole. Conductive pins extend through respective ones of the feed-through capacitors, and in one embodiment ends of these pins abut a surface circuit pad of the printed circuit board. In other embodiments the ends of the conductive pins extend into receiving apertures in the circuit board where they are either press-fit or soldered in place.

Claims20

Dependent claims

An electro-magnetic interference (EMI) suppressor providing an interface between a printed circuit board and a non-metallic interconnect device mountable onto the printed circuit board, the EMI suppressor comprising:

a plurality of ceramic feed-through capacitors conductively bonded together to form a segmented capacitor array;
a conductive fence surrounding the periphery of the segmented capacitor array;
means for conductively bonding the periphery of the segmented capacitor array to an inner periphery of the fence;
central conductors extending through respective feed-through capacitors of the segmented capacitor array;
and
means for attaching the fence to a ground of the printed circuit board, wherein, when the fence is grounded to the printed circuit board, a generally planar surface of the capacitor array lies adjacent to a planar surface of the printed circuit board, and the fence extends generally perpendicularly to the printed circuit board planar surface.

3 more elements

a feed-through capacitive device;
a conductive fence surrounding the periphery of the capacitive device;
means for conductively bonding the periphery of the capacitive device to an inner periphery of the fence;
and
means for attaching the fence to a ground of the printed circuit board, wherein, when the fence is so grounded, a lower surface of the capacitive device lies adjacent to the printed circuit board and the fence extends generally perpendicularly thereto.

2 more elements

Dependencies are inferred from the claim text.

Printed circuit board mount electro-magnetic interference suppressor

Life of this patent

Printed circuit board mount electro-magnetic interference suppressor

Life of this patent

Abstract

Claims20