Auto balancing transformers are disclosed for balancing a multi-phase electrical system by varying the degree of electromagnetic coupling between primary and secondary winding. The auto-balancing transformer includes a movable to selectively couple primary phases with two or fewer phases of the secondary system.

A transformer comprising a first signal path in a first plane or layer and a second signal path in the same plane or layer. The second signal path is offset in a diagonally direction in relation to the first signal path, such that the first signal path and the second signal path are in proximity to establish electric-field coupling between the first signal path and the second signal path. A jumper, located in a second plane, is electrically connected to either the first signal path or the second signal path through vias that extend from the first plane to the second plane. The jumper prevents electrical contact between the first and the second signal path at locations where the first and the second signal path would otherwise intersect on the first plane. The shape of the first and second signal paths may be square or rectangular, or both.

A transformer comprising a first signal path in a first plane or layer and a second signal path in the same plane or layer. The second signal path is offset in a diagonally direction in relation to the first signal path, such that the first signal path and the second signal path are in proximity to establish electric-field coupling between the first signal path and the second signal path. A jumper, located in a second plane, is electrically connected to either the first signal path or the second signal path through vias that extend from the first plane to the second plane. The jumper prevents electrical contact between the first and the second signal path at locations where the first and the second signal path would otherwise intersect on the first plane. The shape of the first and second signal paths may be square or rectangular, or both.

A power inductor includes a housing and a magnetic core disposed in the housing. The core includes a first segment and a second segment spaced apart from each other to define a gap. The first and second segments are supported in the housing such that the they are movable relative to each other to increase and decrease the size of the gap. A fluid having a positive thermal expansion coefficient is disposed in the housing such that expansion and contraction of the fluid due to change in temperature increases and decreases the gap, respectively.

The present application provides a coil for facilitating an electromagnetic coupling and method for increasing the degree of an electromagnetic coupling. The coil for facilitating an electromagnetic coupling includes one or more loops formed from a material through which an electric current can flow. At least one of the one or more loops is adjustable, including at least one of a size and a shape of the at least one of the one or more loops of the coil being selectively adjustable.

The present application provides a coil for facilitating an electromagnetic coupling and method for increasing the degree of an electromagnetic coupling. The coil for facilitating an electromagnetic coupling includes one or more loops formed from a material through which an electric current can flow. At least one of the one or more loops is adjustable, including at least one of a size and a shape of the at least one of the one or more loops of the coil being selectively adjustable.

A power inductor includes a housing and a magnetic core disposed in the housing. The core includes a first segment and a second segment spaced apart from each other to define a gap. The first and second segments are supported in the housing such that they are movable relative to each other to increase and decrease the size of the gap. A passive actuator is disposed in the housing and is configured to move the second segment relative to the first segment to increase and decrease the size of the gap. The passive actuator includes a shape-memory alloy configured to expand as temperature of the inductor increases to urge the first and second segments apart to increase the gap and to contract as the temperature decreases so that the first and second segments move towards each other to decrease the gap.

Auto-balancing transformers are disclosed for balancing a multi-phase electrical system by varying the degree of electromagnetic coupling between primary and secondary windings. The auto-balancing transformer includes a movable armature to selectively couple primary phases with two or fewer phases of the secondary system.

Auto-balancing transformers are disclosed for balancing a multi-phase electrical system by varying the degree of electromagnetic coupling between primary and secondary windings. The auto-balancing transformer includes a movable armature to selectively couple primary phases with two or fewer phases of the secondary system.

A method of controlling highly regulated power and frequency from a high frequency power supply system to provide a highly regulated power and frequency to a workpiece load where the highly regulated power and frequency can be independent of the workpiece load characteristics by inverter switching control and an inverter output impedance adjusting and frequency control network that can include precision variable reactor pairs with a geometrically-shaped moveable insert core section and a stationary split-bus section with a complementary geometrically-shaped split bus section and a split electric terminal bus section where the insert core section can be moved relative to the stationary split-bus section to vary the inductance of the variable reactors.