Abstract: The present application related to switching circuits as employed in power supplies and more particularly to a method of controlling same. More specifically, the present application relates to current shaping circuits for use in power supplies and provides a method for controlling them which provides for stable operating conditions and fast transient response.

Abstract: The present application relates to switching power supplies and in particular to AC to DC switch mode power supplies, to methods of power factor correction for same and to devices and circuits that may be used generally in same. The application describes a number of multi-level approaches and circuits.

Abstract: The present application relates to the field of switching power supplies and in particular to switching power supplies in which a primary side is isolated from the secondary side and in which a synchronous rectifier on the secondary side is controlled from the primary side. The application provides a method for minimizing body diode conduction losses.

Abstract: A class of switching power supplies that use a resonant isolation stage (typically LLC) fed directly or via a diode bridge from the line. Extension of the range of available gain values over frequency without material loss of efficiency is facilitated by usage of additional resonant elements. This capability allows the devices to provide narrow-range inputs to secondary-processing circuits, with the ability to achieve power factor correction if required. The conversion architecture is also compatible with optimal usage of energy storage elements suitable for use with switching power supplies.

Abstract: The present application relates to magnetic components employed in switching power supplies. The application provides a gapped magnetic core (20) construction in which the gap is distributed by placing gaps between the legs (23) of the core and the top and bottom sections (21, 22). The application also provides a bobbin construction having a reduced footprint for inductor and transformers.

Abstract: The present application relates to AC power supplies and in particular to power factor correction circuits in AC-DC converters. The application provides an active power factor correction circuit in which zero voltage switching is inherently achieved using a passive snubbing approach employing a saturable transformer.

Abstract: The present application is directed to drive arrangement for semiconductor switches and in particular to a method of driving the gate of a switch with pulses corresponding to turn-on and turn-off commands through separate turn-on and turn-off transformers. The application provides a fail safe reset feature, a more efficient turn-on circuit and an energy recovery circuit for recovering energy from the gate upon turn-off. The application also provides a novel arrangement for assembling multiple pulse transformers on a circuit board.