MARK COBB DAHLMAN
Pilots at Chandler Rd, Huntsville, AL
License number
Alabama A5164017
Issued Date
Jan 2016
Expiration Date
Jan 2018
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
1424 Chandler Rd SE, Huntsville, AL 35801
Professional information
Application Engineer At Texas Instruments, Inc.
Position:
Application Engineer - Power Specialist at Texas Instruments, Inc.
Location:
Huntsville, Alabama Area
Industry:
Electrical/Electronic Manufacturing
Work:
Texas Instruments, Inc.
since Apr 2006
-
Application Engineer - Power Specialist
Avnet Electronics
May 2004 - Apr 2006
-
Application Engineer
Square D
1996 - 2004
-
Staff Design Engineer
Education:
Tennessee Technological University 1992 - 1996
Ac-Powered, Microprocessor-Based, Dimming Led Power Supply
US Patent:
7791326, Sep 7, 2010
Filed:
Dec 28, 2007
Appl. No.:
12/006100
Inventors:
Mark Cobb Dahlman - Huntsville AL, US
John Charles Glenn - Hillsborough NC, US
John Charles Glenn - Hillsborough NC, US
Assignee:
Texas Instruments Incorporated - Dallas TX
International Classification:
G05F 1/40, G05F 1/00
US Classification:
323284, 323282, 323277, 323234, 323351, 315291, 315247, 315274, 315224
Abstract:
A dimmable, light-emitting diode (LED) power supply adapted to provide a direct current (DC), constant current (“constant current source”) from a conventional, phase-controlled 120 VAC, 60 Hz power source is disclosed. The constant current source of the present invention utilizes two processes to control dimming. In a first process, the phase angle of the input voltage is used to control the duty cycle of a line frequency pulse width modulation (PWM). In a second process, a proportional-current limit adjustment is used to control the average current to the LED during the ON time of the line frequency by PWM. As a result, at relatively low phase angles, peak currents can be lowered, reducing flicker and improving the audible noise levels generated by the circuit.