Patent ID: 7898198

Claim:
A method of controlling the efficiency of power electronics driving a motor, comprising: switching a voltage within said power electronics at a first fundamental frequency; providing a high frequency pulse width modulated component within said first fundamental frequency, said high frequency component have a frequency greater than said fundamental frequency; detecting a rotation speed of said motor; and responsive to said rotation speed, altering said frequency of said high frequency pulse width modulated component from a first switching frequency to a second switching frequency to control efficiency in said power electronics, said altering including determining said second frequency by the equation: f 2 = k * v cur + b k = f max - f min v max - v min wherein f 2 =said second switching frequency; v cur =rotation speed of said motor b=a linear offset frequency equal to a minimum switching frequency; f max =a maximum switching frequency; f min =a minimum switching frequency; v max =a maximum rotation speed for said motor; and v min =a minimum rotation speed of said motor.