DEVICE FOR CONTROLLING A PIEZOELECTRIC CERAMIC, IN PARTICULAR FOR AN INJECTOR ACTUATOR OF AN INTERNAL COMBUSTION ENGINE

摘要

P A converter (CV) supplied with low voltage and supplying a high voltage, is connected to a ceramic charging circuit (C) comprising an inductor (L) forming with the ceramic an oscillating circuit, in series with a transistor (T1) and a diode (D1). According to the invention, there is provided an inductance discharge circuit (L) comprising another transistor (T4) in series with a diode (D4) and connected between this inductance (L) and the high voltage output (Us) of the converter (CV). This complementary transistor (T4 is made conductive during the discharge of said ceramic, until the discharge current in the inductor (L) is canceled. /P