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Abstract

A high frequency AC electro-surgery apparatus is equipped with an automatic regulation loop for controlling the output voltage (U.sub.a) rather than the output power. An electrically isolating coupling in the form of an isolation transformer (5) is followed by a voltage converter (6) to provide DC voltage signal (a) proportional to a measure of the high frequency AC output voltage (U.sub.a). The DC voltage signal (a) is supplied to a regulating amplifier (7) to which a reference voltage signal (b) is supplied by a reference voltage source (8), to produce an output signal (c) that is furnished to the control input of an electronically controlled power supply (16). The latter controls the operating voltage (U.sub.b) for the amplifier (2) of the high frequency AC generator in such a manner that the output AC voltage (U.sub.a) at the output terminals (10, 11) corresponds to a desired value set by the reference voltage signal (b).

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First Claim