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:
Jun. 24, 1997
Filed:
Dec. 14, 1995
Nak-choon Choi, Bucheon, KR;
Maeng-ho Seo, Seoul, KR;
Samsung Electronics Co., Ltd., Suwon, KR;
Abstract
Switching loss in push-pull switching transistors in a resonant inverter or the like, is minimized by assuring the switching of each of the transistors into conduction occurs when the voltage across its principal conduction path is zero-valued, or substantially so. This is done responsive to sensing the flow of forward currents through clamp diodes connected across the principal conduction paths of each of the transistors. This sensing is done so as to avoid the need for an additional coupling transformer. More particularly, the current flow to or from either of the terminals of the primary direct voltage supply, which current flow is in a first direction when either of the switching transistors is conductive and is in a second direction opposite to the first direction when the clamp diodes are conductive, is sensed for determining the times when the switching transistors are to begin to be conditioned for conduction. The switching transistors begin to be conditioned for conduction when the current flow is in the second direction.