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:
Apr. 25, 2006
Filed:
Feb. 26, 2002
Philip Matthew Jones, Cambridge, GB;
Christopher James Newton Fryer, Cottenham, GB;
Philip Matthew Jones, Cambridge, GB;
Christopher James Newton Fryer, Cottenham, GB;
Pelikon Limited, Caerphilly, GB;
Abstract
A high voltage AC power supply circuit for a capacitive load C, such as an electroluminescent lamp, includes a low voltage DC supply, an inductor L and a FET S in series. The FET S can be pulsed so that the inductor L generates a voltage to charge the capacitive load Cvia an H-bridge H, which is in parallel with the FET S. A diode D prevents current discharging from the capacitive load Cwhile the FET S is closed. The total capacitance downstream of the diode D and in parallel with the capacitive load Cis less than the capacitive load C, so that when the polarity of the H-bridge is reversed, the voltage across the H-bridge collapses to earth and the capacitive load Cis discharged via the low voltage DC supply. The circuits which a employ a large smoothing capacitor in parallel with the H-bridge.