The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 24, 1999
Filed:
Jul. 12, 1996
Geoffrey Smith, Filton, GB;
Matra BAe Dynamics (UK) Ltd., Hertfordshire, GB;
Abstract
A switching circuit (3) having a low component count and suitable for use with a nuclear event detector circuit (2) provides a means for isolating a power source (1) from a load (2, 4). A bipolar transistor (5) provides a temperature insensitive, low voltage drop supply to the load (2, 4) and a MOSFET (7) provides base current to the bipolar transistor during standby mode; the MOSFET being turned on by the supply (1). When the supply voltage drops below the threshold voltage of the MOSFET (7), the base bias to the bipolar transistor (5) is removed. The bipolar transistor (5) cannot therefore conduct in the reverse sense and the circuit provides true isolation for the power supply (1) and the load (2, 4).