Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
July 15, 2008
Patent Application Number
10558508
Date Filed
April 12, 2005
Patent Primary Examiner
Patent abstract
An inverter circuit includes a temperature measuring section for measuring a temperature of switching elements forming a powering section, a motor speed detector for detecting a speed of a motor, a carrier frequency determiner for determining a carrier frequency based on a temperature of the switching elements and a speed of the motor, and an output waveform determining circuit for determining a duty in response to a load applied to the motor and for switching a carrier frequency.
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