| 摘要 |
PURPOSE: A lamp driving circuit is provided to prevent an overcurrent toward a specific lamp in case of using many lamps, and prevents a current unbalance between lamps by using two transformers. CONSTITUTION: First to third lamps(41a,41b,41c) are arranged in parallel. A first control power supply unit(20) provides a first control power to each one side of the first and third lamps(41a,41c). A second control power supply unit(30) provides a second control power to one side of the second lamp(41b). There is a frequency difference over a predetermined interval between the first and second control power supply units(10,20). A main power supply unit(10) provides a power to the first and second control power supply units(20,30). A first current sensing circuit(50) senses a current value provided to the first and third lamps(41a,41c) in the first control power supply unit(20), and provides the sensed current value to the first control power supply unit(20). A second current sensing circuit(40) senses a current value provided to the second lamp(41b) in the second control power supply unit(30), and provides the sensed current value to the second control power supply unit(30).
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