DAVID SCOTT SCHOENWALD
Pilots at Bella Vis Ave, Los Gatos, CA
License number
California A1686684
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
143 Bella Vista Ave, Los Gatos, CA 95030
Professional information
High Efficiency Auxiliary Switching Power Supplies
US Patent:
5485076, Jan 16, 1996
Filed:
Aug 16, 1994
Appl. No.:
8/291266
Inventors:
David S. Schoenwald - Los Gatos CA
Charles O. Forge - Los Altos CA
Charles O. Forge - Los Altos CA
Assignee:
Apple Computer, Inc. - Cupertino CA
International Classification:
H02M 3335
US Classification:
323225
Abstract:
Method and apparatus for producing an auxiliary voltage in a switching power supply. One or more auxiliary windings are coupled to the main inductor of the switching power supply. A synchronous switch is used in conjunction with the auxiliary winding to provide rectification and additionally provides waveform averaging which improves efficiency and voltage regulation over varying load conditions.
Semiconductor Bilateral Switch
US Patent:
6424035, Jul 23, 2002
Filed:
Nov 5, 1998
Appl. No.:
09/186770
Inventors:
Steven Paul Sapp - Felton CA
David S. Schoenwald - Los Gatos CA
David S. Schoenwald - Los Gatos CA
Assignee:
Fairchild Semiconductor Corporation - South Portland ME
International Classification:
H01L 2334
US Classification:
257723, 257724, 257776, 257173, 257782, 257783, 257777, 257692, 257784, 361104, 307112
Abstract:
A semiconductor bilateral switch that minimizes the on-state resistance by making a common-source connection between the switch transistors internal to the package. Wire bonds internally connecting the source electrodes of the transistors also provide the function of one or both of a current sense resistor and fuse element.
Flyback Switching Power Supply With Bootstrapped Gate Drive
US Patent:
5559683, Sep 24, 1996
Filed:
Sep 30, 1994
Appl. No.:
8/316282
Inventors:
David S. Schoenwald - Los Gatos CA
Assignee:
Apple Computer, Inc. - Cupertino CA
International Classification:
H02M 3335, H02H 7122
US Classification:
363 21
Abstract:
Method and apparatus for providing bootstrapped gate drive voltage in a flyback switching power supply. Switching transients and ringing caused by leakage inductance and capacitance in the flyback transformer are captured and used to provide a boosted gate drive voltage for the flyback switch, resulting in lower on resistance and lower switching losses.
High Efficiency Supply For Electroluminescent Panels
US Patent:
5566064, Oct 15, 1996
Filed:
May 26, 1995
Appl. No.:
8/451941
Inventors:
David S. Schoenwald - Los Gatos CA
Charles O. Forge - Los Altos CA
Charles O. Forge - Los Altos CA
Assignee:
Apple Computer, Inc. - Cupertino CA
International Classification:
H02M 75387, G09G 310
US Classification:
363132
Abstract:
Apparatus for operating electroluminescent panels. An electroluminescent panel is driven by a voltage source feeding a modified bridge driven by a pulse width modulated signal. By using a pulse frequency above the range of human hearing and a modulating signal that is a sine wave of the proper frequency for operating the panel, a sine wave is generated across the panel without requiring bulky low frequency magnetic components.