Abstract: A controller for controlling a resonant switching dc to dc converter. The controller has four output terminals, each of which is capable of switching one of four transistors in a bridge power stage in such a way as to accomplish zero-voltage resonant switching. The phase relationship between the switching of the four transistors of the bridge power stage which is adjustable from approximately zero to 180.degree., results in highly-efficient, pulse-width-modulation of the output power.

Abstract: A power supply maintains a rectifier circuit in a non-doubler mode configuration when the power supply is attached to a 110-120 volt AC power source, until bulk capacitors in the rectifying circuit are charged to a combined potential of (.sqroot.2)*110-120 volts. The power supply then switches to a doubler mode configuration and the capacitors charge separately to a combined potential of (.sqroot.2)*220-240 volts. The two step charging procedure reduces the inrush current, over that developed in charging the capacitors from a zero volt potential to a combined potential of (.sqroot.2)*240 volts. It thus limits the current through a switch which configures the power supply in the doubler mode. If the power supply operates only with a 110-120 volt AC power source, which is common in high power industrial applications smaller diodes may be used in the rectifier circuitry since the inrush current is reduced.

Abstract: An alternating current conditioner is provided with a magnetic structure that provides smoothing, transient suppression, ride through and power factor correction. The structure has a gapped magnetic core and primary and secondary windings. A shunt is provided between the primary and secondary, with the gap being on the primary side. A capacitor is in series with the secondary winding. The capacitor and the shunt inductance provide an LC low pass filter. The inductance caused by the gap cancels the capacitive effect of the LC filter.