Patent ID: 7061356

Claim:
A frequency converter for supplying electrical power to a load, comprising: a first controllable transformer, comprising; a body of a magnetic material; a primary winding wound round the body about a first axis; a secondary winding wound round the body about a second axis at right angles to the first axis, the secondary winding comprising a central point, a first end, and a second end wherein the central point is in electrical communication with the load; and a control winding wound around the body about a third axis, coincident with the second axis; a first power supply in electrical communication with the primary winding; an AC power supply in electrical communication with the control winding; a first diode rectifier topology in electrical communication with the first end and the second end of the secondary winding; a second controllable transformer, comprising; a body of a magnetic material; a primary winding wound round the body about a first axis; a secondary winding wound round the body about a second axis at right angles to the first axis, the secondary winding comprising a central point, a first end, and a second end wherein the central point is in electrical communication with the load; and a control winding wound around the body about a third axis, coincident with the second axis; a second power supply in electrical communication with the primary winding of the second controllable transformer; an AC power supply in electrical communication with the control winding of the second controllable transformer; and a second diode rectifier topology in electrical communication with the first end and the second end of the secondary winding of the second controllable transformer.