Patent ID: 7746006

Claim:
A protection architecture for a multi-lamp system, which applies to a multi-lamp driving system comprising: a plurality of AC voltage sources outputting several different-phase voltage signals, a multi-phase transformer having a plurality of different-phase coil windings, and a plurality of loads, wherein each loop thereof has at least two of said plurality of loads having opposite polarity and one said coil winding, and each of said AC voltage source drives at least one of said loops, and wherein said protection architecture for a multi-lamp system is characterized in that two of said opposite-phase loads are separately defined to be a first load and a second load, and that a voltage-division/detection loop is formed via cascading a first voltage-division element to a second voltage-division element and is coupled to a point between said first load and said second load to acquire an abnormal current indicating that the currents flowing through the first and second loads are not equal, and said second voltage-division element is coupled to a ground terminal, and a signal-acquiring terminal is coupled to between said first voltage-division element and said second voltage-division element and acquires an abnormal voltage signal for a protection unit.