Patent ID: 9203340
Filing Date: 2015-12-01
Classification: G01K,H02P

Abstract:
1. A temperature estimation device estimating a temperature of one power semiconductor chip that is a temperature estimating target and that is included in one or more power semiconductor chips contained in one power semiconductor module out of power semiconductor modules whose number is equal to or larger than the number of a plurality of motors and that are arranged in the same heat radiator for driving the plurality of motors, respectively, the temperature estimation device comprising: a first electric power loss calculation unit calculating a first electric power loss corresponding to an electric power loss generated in all power semiconductor chips of the power semiconductor module containing the one power semiconductor chip that is the temperature estimating target; a first temperature difference calculation unit calculating, on the basis of the first electric power loss, a first temperature difference corresponding to a temperature difference between the heat radiator and the power semiconductor module containing the one power semiconductor chip that is the temperature estimating target; a second temperature difference calculation unit calculating, on the basis of the first electric power loss and a second electric power loss, a second temperature difference corresponding to a temperature difference between the heat radiator and a reference temperature, the second electric power loss corresponding to an electric power loss generated in all power semiconductor chips of one or more power semiconductor modules other than the power semiconductor module containing the one power semiconductor chip that is the temperature estimating target; a temperature calculation unit calculating a temperature of the one power semiconductor chip that is the temperature estimating target, on the basis of the reference temperature, the first temperature difference, and the second temperature difference; and a temperature output unit outputting the temperature calculated by the temperature calculation unit.