Active solid-state devices (e.g. – transistors – solid-state diode – Regenerative type switching device – Device protection
Reexamination Certificate
2009-09-25
2010-12-21
Ha, Nathan W (Department: 2814)
Active solid-state devices (e.g., transistors, solid-state diode
Regenerative type switching device
Device protection
C257SE29211
Reexamination Certificate
active
07855399
ABSTRACT:
A protection device of programmable semiconductor surge suppressor having deep-well structure is provided comprising one, two or four protection units, each of which is composed of a PN-junction diode, a PNPN-type thyristor and a NPN-type triode connected with each other. It is characterized in that in the diode area on the frontal side of the N-type semiconductor base is formed a PN junction with impurity concentration changed gradiently from top to bottom according to the order of P+, P, N and N+; and a group of deep-wells with P-type impurities are positioned at the interface of the PN junction, making the PN junction form a concave-convex type interface. The present invention can be used in the program-controlled switchboard to protect the Subscriber Line Interface Circuit (SLIC) board. The above improvement can further improve the anti-lightning and anti-surge performance and the energy discharge capability of the whole device. The device of the present invention can reach a level of 3000˜3500 V according to the anti-lightning performance test.
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Ng Man
Ou Ken
Sun Walance
Zhang Shouming
Ha Nathan W
Oliff & Berridg,e PLC
Semitel Electronics Co., Ltd.
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