Power module for the operation of an electric vehicle drive with improved temperature determination of the power semiconductor

US11923785B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Michael Meiler · Longmont, US
• Johannes Hager · Marktleugast, DE
• Stefan Hain · Rückersbach, DE

Key dates

• Filing date: Feb 11, 2022
• Grant date: Mar 5, 2024
• Expiry date: Feb 11, 2042

Classification

• Technology area (CPC G): Physics
• CPC primary: G01K2217/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Method for measuring an operating temperature of a power module (10) that is used for operating an electric vehicle drive, the power module (10) comprising a plurality of semiconductor switching elements (14) and drive electronics (16), wherein the semiconductor switching elements (14) can be switched by the drive electronics (16) in such a way that the semiconductor switching elements (14) allow or interrupt a drain-source current in order to convert the direct current fed into the power module (10) at the input side into an output-side alternating current, wherein the method comprises measurement of a voltage present at a point located on a side of a diode (22) that is connected in series with the semiconductor switching element (14) and that faces away from the semiconductor switching element (14), wherein the method comprises measurement of a drain-source current of the semiconductor switching element (14) that is generated by a current source (18), wherein the method comprises determination of a mathematical dependency between the measured voltage and the measured current.