Patent ID: 7786683

Claim:
A circuit arrangement for operating at least one electric lamp and at least one light emitting diode (LED) comprising: an inverter having a bridge circuit including at least one first bridge transistor and at least one second bridge transistor which are arranged in series with one another, wherein a center point of the bridge circuit is the electrical connection between the first bridge transistor and the second bridge transistor; and a lamp supply unit for supplying a first connection of the electric lamp with energy from the bridge circuit, wherein a second connection of the electric lamp is connected to a ground of the lamp supply circuit, said lamp supply circuit comprising: a supply line for transferring energy from the center point of the bridge circuit to the first connection for the electric lamp, said supply line including an inductance, and an LED supply unit for supplying the at least one LED with energy, wherein the LED supply unit comprises a transformer having a primary winding and a secondary winding; the primary winding is directly electrically connected to the electric lamp, and the inductance in the supply line of the electric lamp is the primary winding of the transformer; and the secondary winding is coupled to the at least one LED.