ZF Friedrichshafen has patented a method to measure the operating temperature of a power module used in electric vehicle drives. By measuring voltage and current, a mathematical relationship is determined to monitor the temperature of semiconductor switching elements. GlobalData’s report on ZF Friedrichshafen gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on ZF Friedrichshafen, was a key innovation area identified from patents. ZF Friedrichshafen's grant share as of February 2024 was 60%. Grant share is based on the ratio of number of grants to total number of patents.

Method for measuring operating temperature of power module in ev

Source: United States Patent and Trademark Office (USPTO). Credit: ZF Friedrichshafen AG

The granted patent (Publication Number: US11923785B2) discloses a method for measuring the operating temperature of a power module used in electric vehicle drives. The method involves measuring the voltage at a point upstream of a diode connected to the semiconductor switching element, measuring the drain-source current of the switching element, and establishing a mathematical relationship between the voltage and current. This relationship helps determine the operating temperature of the semiconductor switching element based on the resistance-temperature correlation.

Furthermore, the patent also describes a power module for electric vehicle drives that includes semiconductor switching elements, drive electronics, and a controller to measure voltage and current, enabling the determination of the operating temperature of the switching elements. The power module also features a diode in series with the switching element and a current measuring device to monitor both drain-source current and phase current. Additionally, the controller can determine a voltage offset, correct the measured voltage, and establish the mathematical relationship between voltage and current. The power module's controller can measure multiple voltages at different points and utilize a filter circuit for accurate temperature assessment based on resistance variations.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.