Patent ID: 8310164

Claim:
A multi-lamp driving system, comprising: a power supply; at least one balance transformer comprising: two cores; two primary windings, each of the primary winding wrapped around a corresponding core and serially connected to a lamp to form a first circuit branch in parallel connection with each other, the first circuit branches being powered by the power supply; two secondary windings, each of the secondary windings wrapped around a corresponding core and electromagnetically coupled to a corresponding primary winding of the balance transformer, two secondary windings of the balance transformer connected in series to form a short circuit loop; two protection windings, each of the protection windings wrapped around a corresponding core of the balance transformer and electromagnetically coupled to a corresponding primary winding of the balance transformer, the protection windings wrapped in opposite directions and connected in series to form a second circuit branch, the second circuit branch configured for outputting voltage signals to the power supply when induced voltages crossing the protection windings are unequal.