Rompower Technology Holdings, LLC

Delta Electronics (thailand) Public Company Limited

Det International Holding Limited

Delta Electronics (thailand) Pcl.

Andrei Stefan Savu

Ionel Jitaru

Marco Antonio Davila

Andrei Ion Radulescu

Mihai Bogdan Jitariu

Lucian Budica

Ionel Dan Jitaru

A power converter formed by a multitude of power cells, wherein each of the power cells is implemented on a four-legged magnetic core placed on a multilayer PCB. Each cell contains rectifier means and resonant capacitors. The cells can be interleaved with the proper delay for reduction of a ripple current through output capacitors. The power cells can be interleaved for the purpose of splitting a high input voltage bus to reduce the voltage stress on the switching elements of the cells.

Magnetic structures for low leakage inductance and very high efficiency

A system for reducing common-mode noise includes a switch mode power supply having primary and secondary sides, primary and secondary side grounds, an input voltage source, a primary switch, a transformer, a core, and a power output. The primary and secondary sides each have a quiet termination. The transformer includes a primary winding, a secondary winding, and an active shield winding between the primary and secondary windings. The active shield winding has two terminations, is wound in a same direction as the secondary winding, and occupies a same axial position on the core as the secondary winding. One of the terminations of the active shield winding is connected to the quiet termination of the primary side, so that the terminations of the secondary winding and the active shield winding that are adjacent each other carry alternating voltages of a same polarity and a same amplitude.

Power transformer for minimum noise injection in between primary and secondary winding 'rompower active shield'

A method of optimizing the efficiency of an AC-DC converter, wherein the energy extraction time from the AC line is increased and as result the size of the bulk capacitor can be decreased and in applications wherein the size of the bulk capacitor is maintained constant the ripple across the bulk capacitor is decreased. The methods presented also increase the power factor in AC-DC converters. Extending the energy extraction from the AC line also lowers the RMS current through the input bridge and the input bulk capacitor. The reduction of the ripple across the bulk capacitor also increases the efficiency of the DC-DC converter, increasing in this way the overall efficiency of the AC-DC converter.

High efficiency AC-DC converter

New and Useful magnetic structures are provided. One feature of the magnetic structures is that they are configured to help minimize the air gap reluctance, improving the magnetic structure's coupling coefficient. Another feature is that reducing the windings AC impedance of a magnetic structure is produced by shielding the winding under ears formed of magnetic material. Still another feature is that leakage inductance of a magnetic structure is reduced, by making ears with cuts which converge toward the magnetic rods that are used in the formation of the structure.

Magnetic structures for large air gap

An improved primary or secondary side pad for a wireless transformer for inductive power transfer through an air gap is provided. The primary or secondary side pad includes a first plate, a second plate, and at least two rods which are linking the first and the second plate, where a winding is wound around each rod. A wireless transformer for inductive power transfer through an air gap includes a primary side pad and a secondary side pad of the transformer which is identical in shape and size.

Multiple cells magnetic structure for wireless power

Several new and useful features for a magnetic structure are provided. One feature is that the magnetic structures are configured to help minimize the winding's AC losses, improving the system's efficiency. Another feature is that the combination of different magnetic hats creates a shaping path for the magnetic field. Still another feature is that a magnetic hat concept can be applied to a variety of magnetic core shapes.

Growing community of inventors

Bucharest, Romania

Andrei Stefan Savu