Ronald B Wolf

US Patent:

6650217, Nov 18, 2003

Filed:

Mar 7, 1997

Appl. No.:

08/813132

Inventors:

Ronald M. Wolf - Katonah NY
Glenn R. Skutt - Blacksburg VA
Liming Ye - Blacksburg VA

Assignee:

Koninklijke Philips Electronics N.V. - Eindhoven

International Classification:

H01F 1706

US Classification:

336178, 336200, 336223

Abstract:

A planar magnetic winding structure such as a transformer or inductor having an air gap in the core has a âkeep awayâ region of 2 to 3 times the gap height in which there are no windings, reducing high frequency winding losses by 35 percent or more, without appreciable increases in low frequency winding losses. Such structures are useful, for example, in electronic ballasts for the lighting industry.

US Patent:

57448647, Apr 28, 1998

Filed:

Aug 1, 1996

Appl. No.:

8/692295

Inventors:

Johannes F. M. Cillessen - Eindhoven, NL
Paulus W. M. Blom - Eindhoven, NL
Ronald M. Wolf - Katonah NY
Jacobus B. Giesbers - Eindhoven, NL

Assignee:

U.S. Philips Corporation - New York NY

International Classification:

H01L 2904
H01L 2976
H01L 2348

US Classification:

257749

Abstract:

A semiconductor device includes a transparent switching element (1) with two connection electrodes (2, 3) of a transparent material and an interposed transparent channel region (4) of a semiconductor material provided with a transparent gate electrode (5) of a conductive material, separated from the channel region (4) by a transparent insulating layer (6). The semiconductor material is a degenerate semiconductor material with a basic material having a bandgap (10) between conduction band (11) and valence band (12) of electrons greater than 2. 5 eV and a mobility of charge carriers greater than 10 cm. sup. 2 /Vs provided with dopant atoms which form a fixed impurity energy level (13) adjacent or in the valence band (12) or conduction band (11) of the basic material. The degenerate semiconductor material is transparent because the absorption of visible light is not possible owing to the great bandgap (10), while also no absorption of visible light takes place through the impurity energy levels (13). The device is capable of comparatively fast switching.

US Patent:

62524879, Jun 26, 2001

Filed:

Nov 4, 1997

Appl. No.:

8/963938

Inventors:

Ronald M. Wolf - Katonah NY
Jose Azevedo - Mahopac NY

Assignee:

Philips Electronics North America Corporation - New York NY

International Classification:

H01F 2702
H01F 1704

US Classification:

336221

Abstract:

A high-leakage planar magnetic component such as an inductor, having a winding structure in which flat winding turns are oriented transverse to the plane of the winding structure, exhibits significantly lower winding losses than components having a stacked arrangement of flat winding turns parallel to the plane of the winding structure. A dense winding structure having such a transverse orientation can readily be made by forming a flat conductor into a coil using conventional wire winding techniques.

US Patent:

62524860, Jun 26, 2001

Filed:

Jun 13, 1997

Appl. No.:

8/874171

Inventors:

Ronald Wolf - Katonah NY

Assignee:

Philips Electronics North America Corp. - New York NY

International Classification:

H01F 500
H01F 2729

US Classification:

336200

Abstract:

A low profile magnetic component such as an inductor or transformer includes a core and a planar magnetic winding body having a dense, rigid structure composed of a stack of individual winding patterns separated by insulating layers, and a binder/filler material. The input and output termini of the individual winding patterns are revealed in a side face of the winding body, where they are interconnected with a plated metallization. Such structures may be mounted onto a PC board, and are useful, for example, in electronic ballasts for the lighting industry.