Abstract: A buck derived isolated DC-DC converter includes a half or full bridge of switching devices which are asymmetrically controlled so that top and bottom switches are opened and closed at mutually exclusive times. Primary side and secondary side DC blocking capacitor(s) and a small valued inductor are placed in series with an isolation transformer. A single secondary rectification uncontrolled switch and inductor-capacitor output filter are included. Additionally a voltage clamping circuit is added across the rectifier which includes an active switch which also may be connected to a tap on the output inductor.

Abstract: Compound inductors for use in switching regulators have two or more symmetrically coupled windings so the component size is reduced as well as a reduction in power losses compared with conventional inductors. The compound inductors may be used in buck and boost regulators. The compound inductor assembly has a first inductor with a first winding on a first magnetic core, a second inductor with a second magnetic core outside the first winding of the first inductor, and a second winding around the first winding of the first inductor and the second core. One end of the first winding and the corresponding end of the second winding is connected to a common connection such that voltages from an alternating current flowing in the first winding have the same polarity in the first winding and in the second winding.

Abstract: A switch mode power converter includes a snubber diode and a snubber capacitor arranged in series with one another across the switching element of the converter. A discharge path is provided for discharging the capacitor by including a second diode, a switch and an inductor extending in series from the node between the snubber diode and the snubber capacitor to the line side of the transformer. The inductor may be coupled to a winding in series with a diode to allow clamping of the voltage across the inductor.