×

Balancing transformers for multi-lamp operation

  • US 7,932,683 B2
  • Filed: 07/02/2009
  • Issued: 04/26/2011
  • Est. Priority Date: 10/06/2003
  • Status: Expired due to Fees
First Claim
Patent Images

1. A backlight system comprising:

  • a plurality of lamp structures in a parallel configuration;

    an alternating current source for powering the plurality of lamp structures;

    a ring balancer coupled in series with the plurality of lamp structures, wherein the ring balancer comprises a plurality of balancing transformers with respective primary windings and respective secondary windings, each of the primary windings connected in series with at least one lamp structure, the secondary windings connected in series with each other; and

    a fault detection circuit configured to monitor a plurality of node voltages in the secondary windings, to generate a feedback voltage corresponding to at least one of the plurality of node voltages, and to compare the feedback voltage with a reference voltage to determine a fault condition.

View all claims
  • 9 Assignments
Timeline View
Assignment View
    ×
    ×