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. 08, 2022
Filed:
Nov. 29, 2017
Comet Ag, Flamatt, CH;
Thomas Fink, Staufen, CH;
Ralf Negele, St. Gallen, CH;
COMET AG, Flamatt, CH;
Abstract
A variable voltage generator circuit is described for generating, from a substantially constant supply voltage V, a variable high-voltage control voltage Vfor a variable power capacitor () having a variable-permittivity dielectric. The control voltage generator circuit comprises a top-up circuit () for maintaining the voltage Von an input capacitor () at least at supply voltage V, and a bidirectional DC-DC converter circuit () having a variable voltage conversion factor G controlled by control input signal (). The bidirectional DC-DC converter () is arranged to convert voltage, at the voltage conversion factor G, between the input capacitor voltage Vand the output voltage V. When V<G×V, the DC-DC converter circuit () uses charge stored in the input capacitor () to charge the capacitive load (). When V>G×V, the DC-DC converter circuit () uses charge stored in the load capacitance () to charge the input capacitor ().