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US 6,212,053 B1Granted
Device and method for driving at least one capacitive actuator
AssigneeSiemens Aktiengesellschaft
InventorsChristian Hoffmann, Hellmut Freudenberg, Hartmut Gerken, Martin Hecker, Richard Pirkl
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Abstract
The device drives one or more capacitive actuators with a control circuit. The device has a series circuit with a charging capacitor, a discharging capacitor, an electric coil, and the one or more actuators each with an associated selector switch. A discharging switch has a drain terminal connected to the node point between the two capacitors, and a source terminal connected via decoupling diodes to the drain terminals of the selector switches.
Claims17
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;
- and
- a bypass device connected between a node between said ring-around coil and said actuator and said source terminal of said discharging switch.
8 more elements
Dependencies are inferred from the claim text.