Invention Grant
- Patent Title: Color correcting device driver
-
Application No.: US13291943Application Date: 2011-11-08
-
Publication No.: US08575863B2Publication Date: 2013-11-05
- Inventor: Charles Cai , Jeff Kotowski , Timothy James Herklots
- Applicant: Charles Cai , Jeff Kotowski , Timothy James Herklots
- Applicant Address: US CA San Jose
- Assignee: Atmel Corporation
- Current Assignee: Atmel Corporation
- Current Assignee Address: US CA San Jose
- Agency: Fish & Richardson P.C.
- Main IPC: G05F1/00
- IPC: G05F1/00 ; H05B37/02 ; H05B39/04 ; H05B41/36

Abstract:
A color correcting device driver is configured to vary the equivalent current into light emitting elements (e.g., LEDs) with the frequency of the AC input current (e.g., 120 Hz). In implementations that include a fly-back controller with a power factor correction (PFC) controller on the primary side, the color correcting device driver performs the method of: 1) turning on the loads (e.g., white and CA strings of LEDs); 2) determining if the voltage supplied to the loads has dropped by a first threshold amount; 3) turning off the loads; and 4) determining if the voltage supplied to loads has recovered by a second threshold amount (or waiting for a fixed amount of time). The method is repeated. In implementations that do not include a PFC controller on the primary side, the color correcting device driver can create a pulse width modulated (PWM) signal.
Public/Granted literature
- US20130113381A1 Color Correcting Device Driver Public/Granted day:2013-05-09
Information query
IPC分类: