Patent ID: 6212053
Filing Date: 2001-04-03
Classification: F02D,H01L,H02N

Abstract:
A device for driving at least one capacitive actuator, comprising:a control circuit;a voltage source having a positive pole and a negative pole;a charging capacitor connected between said positive pole and said negative pole of said voltage source;a series circuit connected in parallel with said charging capacitor, said series circuit comprising a ring-around coil and at least one actuator with an assigned selector switch, at least one N-MOSFET selector switch having a source terminal connected to said negative pole of said voltage source and a drain terminal;a discharging capacitor connected between said charging capacitor and said ring-around coil;a measuring circuit connected to measure a voltage across said discharging capacitor and to relay the voltage to said control circuit;a first diode having an anode connected to said positive pole and a cathode connected to said discharging capacitor for conducting current to said discharging capacitor;a second diode having an anode connected to said cathode of said first diode and a cathode;an N-MOSFET discharging switch having a drain terminal connected to said cathode of said second diode and a source terminal connected to said drain terminal of said selector switch via a decoupling diode; anda bypass device connected between a node between said ring-around coil and said actuator and said source terminal of said discharging switch.