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. 03, 2012
Filed:
Jun. 30, 2009
John L. Melanson, Austin, TX (US);
Mauro L. Gaetano, Austin, TX (US);
Eric King, Dripping Springs, TX (US);
Robert Grisamore, Austin, TX (US);
Zhaohui He, Austin, TX (US);
John L. Melanson, Austin, TX (US);
Mauro L. Gaetano, Austin, TX (US);
Eric King, Dripping Springs, TX (US);
Robert Grisamore, Austin, TX (US);
Zhaohui He, Austin, TX (US);
Cirrus Logic, Inc., Austin, TX (US);
Abstract
A cascaded power converter having an auxiliary power supply operated from the second switching power stage provides efficient operation by activating the auxiliary power supply early in the startup process. A low energy transfer operating mode is initiated in the second switching power stage to charge the auxiliary power supply output without generating significant disruption at the load. After the first switching power stage is started and the intermediate node voltage has increased to a level sufficient to operate the second switching power stage, the final switching power stage enters a normal operating mode. The low energy transfer operating mode has a substantially reduced switching rate and pulse width from that of the normal operating mode.