Electricity: electrical systems and devices – Safety and protection of systems and devices – Transient responsive
Patent
1990-03-08
1992-02-18
Stephan, Steven L.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transient responsive
361 56, 357 2313, H02H 322, H02H 904
Patent
active
050899295
ABSTRACT:
The RICTPD device is designed to protect integrated circuits with external leads on the sides of the case from electrical transients caused by lightning, switching inductive loads such as electrical motors, or other sources. The RICTPD is usually used when a particular IC is identified as most likely to fail in a system. The RICTPD comprises a casing which is slightly larger than the IC casing, and has metal legs in the form of springs which provide a friction fit on the legs of the IC. The inside top of the device case has a plurality of transient protection devices (TPDs) built in between a metal ground plane and the metal legs. A grounding strap is attached from a ground terminal which is part of the ground plane on the device to an available ground on the circuit board. The TPDs may consist of metal oxide varistors, surgectors or zener diodes made to be aligned with the IC legs and the ground plane of the device. The device may be installed over the IC by a press fit. In operation of the device, when a transient overvoltage greater than the clamping voltage of the TPD is seen at one of the IC leads, the TPD is triggered and shunts the current away from the IC. The current flows from the leg of the device through the TPD to the ground plane and then to system ground thereby protecting the IC.
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Davidson Ben
Franz Bernard E.
Singer Donald J.
Stephan Steven L.
The United States of America as represented by the Secretary of
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