Patent ID: 7515447
Filing Date: 2009-04-07
Classification: G01K,H01L,H02M

Abstract:
1. A method in connection with an inverter that comprises several power semiconductor components and a control apparatus to control them, the control apparatus being arranged to control the power semiconductor components in response to a control quantity to generate an output voltage, the method comprising the step of: determining the temperature or an electric quantity affecting the temperature of one or more power semiconductor components, determining the change of the temperature or an electric quantity affecting the temperature of one or more power semiconductor components, and controlling with the control apparatus the power semiconductor components in response to both a control quantity to generate an output voltage and the change rate of the temperature or a quantity affecting the temperature of the power semiconductor components to reduce temperature variation by slowing down a temperature increase rate as the temperature or the electric quantity affecting the temperature increases and by slowing down a temperature decrease rate as the temperature or the electric quantity affecting the temperature decreases.