Control circuit for providing a synchronized drive signal to an oscillating system

A control circuit, for controlling an oscillating system capable of oscillating at a basic frequency, said control circuit having an electrical oscillation generator capable of being synchronized to the oscillating system, and a power stage controlled by the oscillation generator for supplying operating power to the oscillating system, wherein said generator comprises:

• an oscillator which includes an input for receiving an external synchronizing signal and which generates an oscillator pulse sequence at an oscillator frequency corresponding to twice the basic frequency and synchronized with said basic frequency;
• a converter coupled to said oscillator for providing to said power stage a first output pulse sequence comprised of a first set of alternate oscillator pulses with the same polarity;
• and
• feedback means coupled between the oscillating system and the synchronizing input of the oscillator for synchronizing said oscillator to the basic frequency.