Other

Texas Instruments Corporation

John Charles Glenn

Christopher Scott Church

Joseph Zhili Huang

David R Ridgway

Jody Snow

William Bradford Silvernail

Olivier Singla

Mark Cobb Dahlman

Paul Kehle

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.

AC-powered, microprocessor-based, dimming LED power supply

The Improved Mobile Digital Video Recorder (IMDVR) system is a ruggedized, multiple camera video and audio recording system that is installed within a public transit vehicle to record, store, and manage an integrated data stream of data captured within and exterior to the transit vehicle. The system is focused on multiple person vehicles and the capture of an integrated data stream for use in transit security, liability, and evidentiary processes.

Mobile digital video recording system

Growing community of inventors

Hillsborough, NC, United States of America

John Charles Glenn