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| Number | Title | Issue Date |
| 5789907 | Variable impedence transformer An enhanced variable impedance transformer is disclosed for controlling the power from an alternating input power source to a load in accordance with a direct current control signal. The variable impedance transformer comprises a first and a second annula... | 08/04/1998 |
| 5771165 | Apparatus and method for charging a DC battery The battery charger including a power factor correcting and voltage regulating apparatus having an inductor through which current is modulated by a modulator to obtain an efficient regulation and an efficient power factor correction. According to a first ... | 06/23/1998 |
| 5170112 | Power supply device for supplying power to a filament of a radar transmitter An improved power supply device is disclosed where the filament (2) of a transmitter tube (1) is powered by an AC generator (18) via a transformer (12) and a rectifier (24), and where the AC generator (18) receives a feedback via the bifilar winding (5) o... | 12/08/1992 |
| 5163173 | Variable impedance transformer with equalizing winding An apparatus and method is disclosed for an improved variable impedance transformer for controlling the power from an alternating input power source to a load in accordance with a direct current control signal. The invention comprises a DC control winding... | 11/10/1992 |
| 5059762 | Multiple zone induction heating Induction heating apparatus, e.g. for melting, has induction coil sections, each associated with a respective zone of the melt or other work load, the power applied to each section from a supply being controlled individually through a saturable reactor re... | 10/22/1991 |
| 4907246 | Magnetically controlled variable transformer A magnetically controlled variable transformer comprising magnetic cores and windings by which to accurately and reliably control electrical AC output power. The cores and windings act as a continuously variable turns-ratio transformer for use primarily a... | 03/06/1990 |
| 4868481 | Apparatus and method for balancing electrical currents in a multiple-phase system A current balancer for balancing one or more currents provided from a three-phase source to a load includes three current transformer/full-wave rectifier bridge sections and one or more saturable core reactors. Each of the current transformer/full-wave re... | 09/19/1989 |
| 4853611 | Inductive, electrically-controllable component An inductive component for universal use in any electrical/electronic circuits, whose coefficient of self-induction (L) is independent of the signal, is constant, electrically controllable and can be varied significantly. The component (10) comprises two ... | 08/01/1989 |
| 4785389 | Astable, magnetically coupled multivibrator A multivibrator circuit is provided having two power capacitors C1 and C2 in a power part, a primary winding N1 of a transformer T, as well as two switching transistors Q1 and Q2, and two diodes D3, D4. A positive feedback coupling is provided via the tra... | 11/15/1988 |
| 4574231 | Magnetic amplifier apparatus for balancing or limiting voltages or currents An apparatus for controlling electrical characteristics in an alternating current system includes a first level of magnetic amplifiers which are responsive to a primary direct current control signal. The magnetic amplifiers provide secondary control signa... | 03/04/1986 |
| 4470006 | Transformer A transformer with twelve cores, a first six arranged in parallel rows of three, a second six, in parallel rows of three at right angles to the first six and positioned between the first and second, and second and third cores of each row of the first six;... | 09/04/1984 |
