Patent ID: 8528532

Claim:
A power supply device for a radiofrequency ignition system, comprising: a power supply circuit configured to apply, to an output to be connected to a plasma-generating resonator, a power supply voltage at a frequency defined by a control signal supplied by a power supply circuit control device, the power supply circuit comprising a parallel resonant circuit connected between a capacitor of the power supply circuit and a drain of a switch transistor controlled by the control signal and connected to the output; the power supply circuit control device includes a first interface configured to receive a request to determine an optimum control frequency; the power supply circuit control device includes a second interface configured to receive signals measuring voltage at terminals of the capacitor of the power supply circuit; and a module configured to determine optimum control frequency, configured to supply, in succession, different control frequencies to the power supply circuit for successive ignition commands on reception of a request and to determine an optimum control frequency as a function of measurement signals received via the second interface.