PERIODIC EXCITATION CIRCUIT AT VARIABLE LEVEL OF A CAPACITIVE LOAD.

摘要

The present invention relates to a given frequency and adjustable level excitation circuit of a capacitive load (B) having a first terminal connected to a reference voltage (G). The circuit comprises: two switches (S1, S2) connected in series between a supply voltage (Vcc) and the reference voltage (G), the connection point (S) of the two switches being coupled to the second terminal (A) ) the load, these two switches are not simultaneously closed; a periodic control circuit (10) for closing the switch connected to the supply voltage; and regulating means (R2, R3, 12) acting on the control circuit to open one of the switches when the voltage across the load reaches a predetermined value. / P