Electricity: electrical systems and devices – Safety and protection of systems and devices – Impedance insertion
Reexamination Certificate
2006-06-02
2009-08-18
Nguyen, Danny (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Impedance insertion
C361S111000
Reexamination Certificate
active
07576962
ABSTRACT:
A method and apparatus for transient blocking relying on a transient blocking device and a sampling circuit. The transient blocking device has at least one depletion mode n-channel device interconnected with at least one depletion mode p-channel device such that a transient alters a bias voltage Vpof the depletion mode p-channel device and a bias voltage Vnof the depletion mode n-channel device in such a manner that the depletion mode devices mutually switch off to block the transient. The sampling circuit is interconnected with the depletion mode p-channel device and the depletion mode n-channel device to determine whether the transient persists. In the event of a persistent transient, the sampling circuit uses a disconnect element for permanently blocking the transient blocking device. Various types of voltage pinching and disconnect elements, including depletion mode devices of the n-channel and p-channel type can be employed in the sampling circuit to sample the transient and permanently block the transient blocking device.
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Bourns Inc.
Lumen Patent Firm
Nguyen Danny
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