Method of driving at least one capacitive actuator

US6133714A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Christian Hoffmann · Leonberg, DE
• Hellmut Freudenberg · Bad Abbach, DE
• Manfred Weigl · Viehhausen, DE
• Hartmut Gerken · Nittendorf, DE
• Martin Hecker · Laimerstadt, DE
• Richard Pirkl · Regensburg, DE

Key dates

• Filing date: Dec 6, 1999
• Grant date: Oct 17, 2000
• Expiry date: Dec 6, 2019

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2041/2082
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method of driving at least one capacitive actuator with a charge voltage. From a charge quantity .DELTA.Q supplied to the actuator and from the actuator voltage U.sub.p applied to the actuator after the charging operation is terminated, the actuator capacitance is calculated by the equation C.sub.p =.DELTA.Q/U.sub.p. From these values, the energy E.sub.actual =0.5*C.sub.p *U.sub.p.sup.2 =0.5*.DELTA.Q*U.sub.p is calculated. The charge voltage is regulated such that the energy actually supplied is equivalent to a specified desired value.