Surge protector for vehicular traffic monitoring equipment
OwnerJohn C. Tomlinsoninventor
Life of this patent
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Abstract
A surge protection device for low level electronic systems and especially conventional roadway traffic monitoring equipment connected to embedded roadway sensors, which includes, for each sensor, first and second stage common mode and normal mode surge arrestor circuits and which stages are connected by a common mode choke in series with the sensor circuit and monitoring equipment. The first and second stage surge arrestor circuits and choke are preferably mounted on surge arrestor circuit boards having enlarged conductive traces and peripheral ground contact surfaces which enable large surge currents to pass to ground when the boards are mounted to a common grounding backplane.
Claims14
A surge protection device for use between a roadway traffic sensor and its related monitoring equipment to limit common mode and normal mode transients comprising, first and second stage surge current arrestor circuits, each of said first and second stage surge current arrestor circuits including common mode surge limiting means and normal mode surge limiting means connected with one another, means for connecting said common mode surge limiting means to ground, input means for connecting said first stage surge arrestor circuit to the roadway traffic sensor, output means for connecting said second stage surge arrestor circuit to the monitoring equipment, and a choke means connecting said first and second stage surge arrestor circuits.
A surge protection device for use between a roadway traffic sensor and its related monitoring equipment to limit common mode and normal mode transients comprising, first and second stage surge current arrestor circuits, each of said first and second stage surge current arrestor circuits including a first pair of common mode surge limiting means and a normal mode surge limiting means connected with one another, said first stage surge current arrestor circuit having a second pair of surge current limiting means, means for connecting each of said common mode surge limiting means to ground, input means for connecting said first stage surge arrestor circuit to the roadway traffic sensor, output means for connecting said second stage surge arrestor circuit to the monitoring equipment, and a choke means connecting said first and second stage surge arrestor circuits.
Dependencies are inferred from the claim text.