Patent ID: 7455051

Claim:
In an internal combustion engine having fuel injection valves operated by respective piezo actuators, a control device for the piezo actuators, comprising: a series circuit of a flyback converter for up-converting an electrical system voltage of an onboard DC electrical system and an output stage for controlling the piezo actuators; said flyback converter having a transformer with a secondary winding; said output stage being formed as a SEPIC converter having an input side with a series circuit of a transistor and a coupling capacitor connected via a node; said transistor having an emitter connected to a negative potential of the onboard DC electrical system; said coupling capacitor having a first connection connected to said transistor and a second connection; a first connection of said secondary winding being connected to a node between said transistor and said coupling capacitor; and a diode connected between a second connection of said secondary winding and said second connection of said coupling capacitor, said diode conducting in a direction from said secondary winding of said transformer to said second connection of said coupling capacitor.