Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1982-03-26
1984-03-27
Wong, Peter S.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 75, 363 24, H02H 7122
Patent
active
044398220
ABSTRACT:
A method and apparatus is disclosed for detecting an impending saturation in nonlinear magnetic material for particular operating conditions, such as in a core of a power transformer T.sub.1 of a switched-mode converter, in response to a varying magnetic field in a principal direction induced by a drive current through its primary winding with its axis aligned in the principal direction. A transverse flux sense winding (20) is used in monitoring the rate of change of flux density of a transverse magnetic field to produce a voltage proportional thereto. That voltage is compared in a comparator (22) with a predetermined threshold voltage characteristic of impending saturation of the core. The output of the comparator is used for controlling drivers (25) to prevent saturation of the switched-mode converter bias switching the drivers off alternately when the sensed voltage reaches the predetermined threshold set at the comparator (22).
REFERENCES:
patent: 3443198 (1969-05-01), Wanlass
patent: 3697855 (1972-10-01), Kernick et al.
patent: 3854091 (1974-12-01), Knudsen
patent: 4042872 (1977-08-01), McLeod
California Institute of Technology
Wong Peter S.
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