Abstract: Single-stage switched AC/DC converters are provided with a PFC (power factor correction) lead enhanced by inclusion of a saturable reactor and/or by connecting the PFC lead to an intermediate tap in a primary winding of the customary isolation transformer located in the DC/DC conversion part of the converter. An important resulting improvement is reduction in the voltage stress on the energy-storage (or "bulk") capacitor. Included are various circuit arrangements of resetting the saturable inductor, for designer or user selection.

Abstract: A bi-directional, magnetic isolator which can pass an isolated housekeeping supply voltage from an input side to an output side and can also transfer an isolated error signal from the output side to the input side of the isolator. The dual functions of the magnetic isolator allow a power supply to operate properly during either a no-load or output short circuit condition. The magnetic isolator comprises a pair of pulse transformers each having a primary and a secondary winding. The housekeeping supply voltage is transferred through one of the pulse transformers by pulsing the supply voltage from the primary winding to a secondary winding, rectifying the pulsating voltage and storing the rectified voltage on an output capacitor. The error signal is transferred in an opposite direction through the second pulse transformer using the same technique, i.e.

Abstract: A family of consolidated soft-switching AC/DC PFC converters, for power supplies and related uses. Any of several effective circuitry designs is interposed from an intermediate node on a rectified positive lead to a preselected intermediate node operative as a high-frequency AC source in a DC/DC conversion stage. Features so optimizable, individually or in combination, include power factor, regulation, and efficiency, plus reduction in circuit complexity.

Abstract: An improved magnetically integrated power converter which are provided specifically for use with power supplies with high density requirements. The converters comprise an integrated magnetic device integrating the functions of two transformers and three inductors. The integrated magnetic device is implemented on a three-leg core with two secondary windings and one primary winding, each winding on one of the core legs. The primary winding connects to the input dc voltage source by either a forward type arrangement or a half-bridge type circuit arrangement. Each secondary winding connects to the output through a rectifier. The turns number for two secondary windings can be different in order to achieve wider input range or reduced voltage stress.