POWER SUPPLY FOR RADIOFREQUENCY IGNITION WITH DUAL-STAGE AMPLIFIER

摘要

The invention relates to a power supply device for a radiofrequency ignition, said device being intended to supply a DC voltage at a predefined frequency to a series resonator and comprising a power supply source (3) able to deliver a DC power supply voltage (Valim), a DC-DC converter (4) amplifying said DC power supply voltage (Valim) and delivering on one output a DC voltage, known as the intermediate voltage (Vinter), the amplitude of which is higher than said DC power supply voltage, and a power switch controlled by a control signal for selectively applying said intermediate voltage (Vinter) to the series resonator at a control frequency equal to said predefined frequency. According to the invention, the DC-DC converter comprises two stages, a voltage raising stage (41) and a voltage regulating stage (42) so as to reduce the voltage drops at the output side of the converter when the ignition generates sparks.