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:
Jul. 11, 2000
Filed:
Mar. 16, 1998
Roshanak Aflatouni, Cupertino, CA (US);
Supertex, Inc., Sunnyvale, CA (US);
Abstract
A method for improving the efficiency of H-bridge electrical switching devices that drive a capacitive load such as electroluminescent lamps, liquid crystal devices and piezoelectric transducers. The method provides for discharge steps that first discharge the capacitive load to a difference in voltage potential of zero (0) volts before re-charging from the opposite side. By implementing the method, the DC power supply will only be required to charge the capacitive load from zero (0) volts to +Vcs volts, rather than +Vcs volts to -Vcs volts as in prior art. With less energy required from the DC power supply to accomplish the same result, a more efficient switching network is achieved.