Method for estimating the intrinsic temperature of at least one power transistor in a power electronics system

DE102025112167A1Undetermined Publication Date: 2026-10-01ROBERT BOSCH GMBH
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Patent Information

Application Number
DE102025112167
Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Filing Date
2025-03-28
Publication Date
2026-10-01

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Abstract

The invention relates to a method for estimating the intrinsic temperature (TJ) of at least one power transistor (76) of a power electronics (34) comprising the following steps (114, 116, 118, 120): • Measuring a load current (IU, IV) to supply an electrical load (74) controllable by the at least one power transistor (76) with the power transistor (76) switched on, • Measuring a voltage drop (UDS) across the switched-on power transistor (76), • Determining a forward resistance (RDSon) of the power transistor (76) based on the measured load current (IU, IV) and the measured voltage drop (UDS), and • Determining the intrinsic temperature (TJ) of the power transistor (76) based on the forward resistance (RDSon) using a look-up table that provides a relationship between the forward resistance (RDSon) and the intrinsic temperature (TJ) for the power transistor. (UDS) is stored.Furthermore, the invention relates to a drive unit (26) comprising an electric motor (30) and an electronic unit (32) with power electronics (34) for controlling the electric motor (30) and with control or regulating electronics (36) for carrying out the method, as well as an electrically driven vehicle (10), in particular a one- or two-wheeler (12), with a corresponding drive unit (26).
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Citation Information

Patent Citations

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