Abstract: This disclosure relates to a system for supplying a stable DC high voltage to a load by resonantly driving a high voltage transforming circuit comprising a VLT and a capacitor type multiple boosting circuit. The system includes a VLT, a capacitor type multiple boosting circuit and a pulse-amplitude feedback control circuit designed to detect supply voltage to load, to compare the detected voltage with reference voltage and to control the voltage of the control winding of VLT by using the deviation produced by the comparison as a control signal.

Abstract: A variable reactor having main windings wound on one set of legs of a magnetic core and control windings mounted on another set of legs. The core provides common paths for the control flux resulting from the control windings and the main windings, but the magnetic circuit for the flux caused by the control windings does not include the legs on which the main windings are wound.

Abstract: In a method for the enhancement of the A.C. performance of an inductor such as a transformer or choke, the tendency of the core of the inductor to become saturated by flux arising from low frequency A.C. or D.C. currents flowing in the inductor winding is reduced by detecting the magnitude of such currents and applying to a control winding wound on the core of the inductor a compensating current in order to generate a magnetic flux in the core of the inductor which opposes the component of flux tending to cause saturation. An inductor to which the method may be applied may accordingly comprise a main winding, a magnetic core, a control winding, means for sensing the presence in said main winding of a current having a frequency below a predetermined limit, and means for applying to said control winding a control circuit tending to balance the flux generated by the sensed current.

Abstract: A voltage regulator using a saturable transformer comprises a transformer having a primary and secondary windings, an AC power source for supplying the primary winding a fluctuating alternating current, and a rectifier connected to the secondary winding for rectifying an AC voltage derived therefrom to produce a DC output voltage. The transformer includes a core having four legs and two common portions magnetically joining the four legs, and a control winding supplied with DC control bias from a control circuit. The primary and secondary windings are wound on the first and second legs and the control winding is wound on the first and third legs.

Abstract: A variable leakage transformer or a variable voltage transformer comprising a magnetic core with a main-magnetic path and a sub-magnetic path, the main magnetic path having at least a common magnetic path with the submagnetic path, a primary winding wound on said common magnetic path of the core, a secondary winding wound on said main magnetic path of the core, means for controlling the magnetic flux in said sub-magnetic path, and said main-magnetic path having a thin air gap. By controlling the magnetic flux in the sub-magnetic path, the leakage of the flux induced by the primary winding from the main-magnetic path to the sub-magnetic path can be controlled. Thus the coupling between the primary and secondary windings, and conduction period in each cycle of the AC output voltage are controlled. The control of the conduction period in each cycle provides the control of the power transmitted from the primary winding to the secondary winding.

Abstract: A transformer for voltage regulators has a first core provided with four legs and two common base plates, which are magnetically joined to the four legs, with an input winding being wound on the first and second legs, an output winding being wound on the legs in a transformer-coupling manner to the input winding, and a control winding being wound on the first and third legs in an orthogonal coupling manner with the first winding, and a second core joined to one of the common base plates of the first core to form a magnetical loop with a coil being wound thereon.