DAVID BROOKE LEWIS
Architects in Torrance, CA
License number
Pennsylvania RA015237X
Category
Architects
Type
Registered Architect
Address
Address
2
Torrance, CA 90504
Pennsylvania
Pennsylvania
Professional information
Traveling-Wave Tube Turn-Off Body Energy Circuit
US Patent:
8427058, Apr 23, 2013
Filed:
Feb 8, 2011
Appl. No.:
13/022897
Inventors:
David Eric Lewis - Torrance CA, US
Assignee:
L-3 Communications Electron Technologies, Inc. - Torrance CA
International Classification:
H01J 25/34
US Classification:
315 35
Abstract:
An apparatus that includes a traveling-wave tube having an electron gun having a cathode. The apparatus also includes a first power supply for establishing a first electric potential between the cathode and an anode and for providing an operational current to the cathode to generate a beam of electrons. The apparatus also includes a slow-wave structure having a passage through which the beam of electrons passes. The apparatus also includes a second power supply for providing a voltage to a beam focusing electrode to establish an electric potential between the cathode and the beam focusing electrode. The apparatus also includes a switching module coupled to the first power supply and the second power supply, the switching module providing a current path between the cathode and the beam focusing electrode, wherein the current path is disabled when a biasing current is below a predetermined level.
Traveling-Wave Tube Turn-Off Body Energy Circuit
US Patent:
7893620, Feb 22, 2011
Filed:
Dec 20, 2006
Appl. No.:
11/642807
Inventors:
David Eric Lewis - Torrance CA, US
Assignee:
L-3 Communications Electron Technologies, Inc. - Torrance CA
International Classification:
H01J 25/34, H01J 29/96
US Classification:
315 35, 315 3
Abstract:
An apparatus that includes a traveling-wave tube having an electron gun having a cathode. The apparatus also includes a first power supply for establishing a first electric potential between the cathode and an anode and for providing an operational current to the cathode to generate a beam of electrons. The apparatus also includes a slow-wave structure having a passage through which the beam of electrons passes. The apparatus also includes a second power supply for providing a voltage to a beam focusing electrode to establish an electric potential between the cathode and the beam focusing electrode. The apparatus also includes a switching module coupled to the first power supply and the second power supply, the switching module providing a current path between the cathode and the beam focusing electrode, wherein the current path is disabled when a biasing current is below a predetermined level.
Protection Circuit For Traveling Wave Tubes Having Multiple Input Tones
US Patent:
6324041, Nov 27, 2001
Filed:
Oct 21, 1999
Appl. No.:
9/422876
Inventors:
Dan M. Goebel - Tarzana CA
David E. Lewis - Torrance CA
Ronglin Liou - Alhambra CA
David E. Lewis - Torrance CA
Ronglin Liou - Alhambra CA
Assignee:
Hughes Electronics Corporation - El Segundo CA
International Classification:
H02H 318
US Classification:
361 87
Abstract:
A protection circuit (30) for a Traveling Wave Tube having multiple tone operation. The protection circuit (30) is a dual sensor (52, 54) arrangement. One sensor (52) is an operational amplifier circuit (56) having a short time constant and a high threshold current. The first sensor (52) provides protection against short time scale faults. The second sensor (54) is an operational amplifier circuit (58) having a time constant higher than the first sensor (52) and a lower current threshold than the first sensor (52) to provide protection against long time scale events. The two sensors (52 and 54) are logically "OR"ed with each other and eliminate spurious shutdowns and circuit damage.