US Patent No. 9,860,946

CIRCUIT TOPOLOGY FOR DRIVING HIGH-VOLTAGE LED SERIES CONNECTED STRINGS


Patent No. 9,860,946
Issue Date January 02, 2018
Title Circuit Topology For Driving High-voltage Led Series Connected Strings
Inventorship James LoCascio, Mountain View, CA (US)
Assignee Maxim Integrated Products, Inc., San Jose, CA (US)

Claim of US Patent No. 9,860,946

1. A backlighting system comprising:
one or more LED strings;
a high-voltage source;
one or more low-voltage regulators coupled in a feedback loop, the one or more low-voltage regulators have a polarity opposite
that of the high-voltage source, the high-voltage source and the one or more low-voltage regulators provide voltage differences
across the one or more LED strings to illuminate the one or more LED strings without a current source, the one or more low-voltage
regulators are programmed to periodically couple outputs of the one or more LED strings to a controlled and variable low voltage.