A DC power source is connected to a base of a transistor of each of inverter circuit through a resistance in series. A primary winding having an intermediate tap of an inverter transformer, a resonance capacitor and a primary winding of a synchronization transformer are connected together in parallel...http://www.google.fr/patents/US6392367?utm_source=gb-gplus-shareBrevet US6392367 - Electric discharge lamp lighting device
