Madhu Rayabhari

US Patent:

7378805, May 27, 2008

Filed:

Mar 22, 2005

Appl. No.:

11/086955

Inventors:

In-Hwan Oh - Cupertino CA, US
Madhu Rayabhari - Cupertino CA, US

Assignee:

Fairchild Semiconductor Corporation - South Portland MA

International Classification:

H05B 37/02

US Classification:

315291, 315219, 315307

Abstract:

This invention presents a single-stage power converter for driving many number of Light-Emitting-Diode (LED). The power converter converts an AC input voltage into DC current source and regulates the current flowing into the LED. In addition, the AC input current is controlled to have a sinusoidal waveform synchronized with the AC input voltage so that AC input Power Factor is corrected. Hence, both of Power Factor Correction (PFC) and LED current regulation are obtained simultaneously by using a single power conversion stage. So higher efficiency with low cost can be obtained.

US Patent:

60444282, Mar 28, 2000

Filed:

Mar 17, 1998

Appl. No.:

9/040110

Inventors:

Madhu Rayabhari - Cupertino CA

Assignee:

Fairchild Semiconductor Corporation - South Portland ME

International Classification:

G06F 1310
G06F 1340
G06F 1517
G06F 300

US Classification:

710129

Abstract:

A Universal Serial Bus node having a non-volatile memory is preprogrammed with the data bits necessary to configure an attached state machine to become a translator or modified translator for signals from a computer peripheral device. On startup, the Universal Serial Bus node is configured to translate signals to and from the computer peripheral device into USB protocol signals to and from a Universal Serial Bus equipped computer in order to assure proper communication therebetween.