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:
Nov. 25, 1997
Filed:
Sep. 17, 1996
Kin E Shum, Los Angeles, CA (US);
Hughes Electronics, Los Angeles, CA (US);
Abstract
A full shunting BVL with current sense capability includes a pair of parallel connected switches that switch with the same duty cycle D/2 but 180 degrees out of phase to provide current from a power source through a coupled power inductor to a bus. A current transformer is provided with first and second windings connected in series with the pair of switches, respectively, and a third winding. The alternating conduction of current through the first and second windings produces a bidirectional voltage across the third sensor winding that automatically resets the current transformer's ferrite core during each cycle. As a result, the bidirectional voltage can be rectified to produce a current sense signal. The current sense signal is used to provide current-mode control to regulate the bus voltage and supply the demanded load current. The current sense signal can also be used to provide current limiting and current sharing, which allows multiple BVLs to be connected to the same solar array. This smooths the transitions in the load current supplied to the bus.