Patent ID: 8646429

Claim:
A plasma generating device, comprising: a supply circuit including a switch controlled by a control signal of a control device to apply an intermediate voltage to an output of the supply circuit at a frequency defined by the control signal; a plurality of plasma generating coil spark plug assemblies arranged in parallel on the output of the supply circuit via connectors, each connector to be connected in a removable manner to a corresponding coil spark plug assembly, a first coil spark plug assembly of the plurality including a first means to offset the resonant frequency of the first coil spark plug assembly to a first resonant frequency, and a second coil spark plug assembly of the plurality including a second means to offset the resonant frequency of the second coil spark plug assembly to a second resonant frequency separate from the first resonant frequency; and the control device for the supply circuit determines the frequency of the control signal from one of the resonant frequencies of the coil spark plug assemblies so as to selectively control the coil spark plug assemblies according to the control frequency used.