Abstract: This high frequency voltage generator which may be used particularly in surgery for supplying an electric bistoury, comprises a power oscillator operating an output transformer. A chopping supply is placed in the direct control chain of the power oscillator. The output voltage of the generator is controlled by a first regulation loop whose reference value is increased by means of a positive feedback proportional to the output current.

Abstract: This ultrasonic generator comprises a transducer supplied by an oscillator via a transformer. The oscillator is supplied in parallel by a constant current generator and a voltage generator. Means are also provided to block the voltage generator as long as the impedance of the load remains lower than an adjustable threshold, so that the supply functions as constant current generator and, on the contrary, to block the current generator as soon as the impedance of the load exceeds the adjustable threshold, so that the supply then functions as voltage generator and limits the output power.