The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 20, 2001
Filed:
Sep. 16, 1999
FEV Motorentechnik GmbH & Co. Kommanitgesellschaft, Aachen, DE;
Abstract
The invention related to a method for low loss periodic control of a capacitive load (C,), in particular of a piezoelectric actuator. In this method, before load control begins, a capacitor bank (C,) is charged via a voltage source (U,) until the oprating voltage of load (C,) is attained; then the load (C,) is charged from the capacitor bank (C,) via a series resonant circuit formed by a reactance coil (L,), a freewheeling diode (D,), and by the load (C,). In this method, when a load is required, the load (C,) is linked via discharge switch (S,) to the reactance soil (L,) which is itself connected via a freewheeling freewheeling diode (D,) to the capacitor bank (C,) in such a way that the load (C,) is discharged until a residual voltage (U,).