Electronics unit for an electric device

By using controlled current sources and damping elements to manage current change phases, the electronic unit optimizes switching behavior, addressing ringing and EMC issues while maintaining fast switching speeds and reducing diode stress.

WO2026109309A1PCT designated stage Publication Date: 2026-05-28ROBERT BOSCH GMBH
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ROBERT BOSCH GMBH
Filing Date
2025-11-06
Publication Date
2026-05-28

AI Technical Summary

Technical Problem

The rapid switching of power transistors, particularly under hard switching conditions, leads to ringing of control and power signals, poor electromagnetic compatibility (EMC) performance, and potential destruction of driver circuits due to high transients and voltage drops, which existing solutions often exacerbate by increasing common-source inductance, slowing down switching, or causing excessive switching losses.

Method used

Incorporating a controlled current source connected to a power electrode of the power transistor, utilizing negative voltage feedback through common-source inductance to precisely control current change phases during switching, especially the turn-off phase, without increasing inductance, and employing damping elements like resistors, capacitors, or inductors to extend current change phases.

Benefits of technology

This approach optimizes switching behavior, reduces voltage peaks, improves EMC, and minimizes diode stress by controlling current change rates, achieving efficient and safe switching without increasing common-source inductance.

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    Figure EP2025082069_28052026_PF_FP_ABST
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Abstract

The invention relates to an electronics unit (10) for controlling a load current (I) of an electric load (12), in particular of an electric motor (14), of an electric device by means of at least one power transistor (18) which has at least one control electrode (34) and two power electrodes (36, 38), wherein a control circuit (48) of the power transistor (18) comprises a driver circuit (26) controlling the control electrode (34) and a power circuit (52) of the power transistor (18) comprises the two power electrodes (36, 38) and the electric load (12), and wherein a parasitic inductance of the control circuit (48) and at least one parasitic inductance of the power circuit (52) form a common source inductance (LCSH, LCSH1, LCSH2). According to the invention, the switching behaviour of the at least one power transistor (18) can be influenced during a switching phase (T2, T7), in particular a switch-off phase T7), in which the load current (I) changes over time, by means of at least one controlled current source (54) which is connected to one of the power electrodes (38), in such a way that a negative voltage feedback to the control electrode (34) takes place as a result of the change over time of the load current (dI / dt) via the common source inductance (LCSH, LCSH1, LCSH2). In addition, the invention relates to an electric device, in particular a motor-operated electric device, comprising an electronics unit (10) according to the invention for controlling an electric load (12), in particular a one-phase or multiphase electric motor (14).
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Citation Information

Patent Citations

  • ACTIVE GATE BLOCKING FOR INVERTER SWITCHING DEVICES WITH IMPROVED COMMON SOURCE INDUCTIVITY

    DE102017128264A1

  • Electronic unit for an electrical appliance

    DE102022202702A1