Circuit arrangement for inductive heating of at least one fuel injection valve, as well as fuel injector arrangement with such a circuit arrangement and method for operating a circuit arrangement and a fuel injector arrangement

摘要

The present invention relates to a circuit arrangement for the inductive heating of at least one fuel injection valve with a power-transistor full-bridge circuit (t1, t2, t3, t4), which as a driver for the operation of a series resonant circuit (c1, lh1, rl1) with an alternating voltage, at or near the resonant frequency is used. The series resonant circuit includes the heater coil, wherein the resulting voltage at this significantly higher than the supply voltage can be. The the heater coil (lh1, rl1) power output, which can be supplied via a change in the frequency or the duty cycle of the control signals of the switching elements of the bridge circuit is changed and can be regulated.