All-in-one electric drive system for electric vehicles

By sharing the DC link capacitor between the motor controller and on-board charger, the all-in-one electric drive system reduces volume and cost, addressing the bulkiness and expense issues of existing systems.

DE102025145642A1Pending Publication Date: 2026-05-21ROBERT BOSCH GMBH
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
ROBERT BOSCH GMBH
Filing Date
2025-11-06
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Existing all-in-one electric drive systems for electric vehicles are bulky and expensive due to the integration of large and costly DC link and ripple-suppression capacitors in the motor controller and on-board charger circuits.

Method used

The DC link capacitor is configured in parallel with the power input terminal of the motor controller and the power output terminal of the AC-DC converter circuit, and a circuit is placed between the motor controller or on-board charger and the on-board battery to control their operating states, allowing the DC link capacitor to be shared, thereby reducing system volume and cost.

Benefits of technology

This configuration reduces the volume and cost of the all-in-one electric drive system by utilizing the inherent DC capacitance in the motor controller and eliminating the need for separate large capacitors, enhancing efficiency and performance.

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Abstract

In the embodiments described in this document, an all-in-one electric drive system for an electric vehicle is provided. In this system, a power output terminal of a DC-DC converter circuit in an on-board charger is connected via a first circuit to an on-board battery power supply terminal of the all-in-one electric drive system, and a power input terminal of a motor controller is connected in parallel to a power output terminal of an AC-DC converter circuit in the on-board charger and connected via a second circuit to the on-board battery power supply terminal. An intermediate circuit capacitor is configured to be connected in parallel to the power input terminal of the motor controller and to the power output terminal of the AC-DC converter circuit.In charging mode, the first circuit is closed and the second circuit is open; in motor-driven mode, the first circuit is open and the second circuit is closed. This system allows the motor controller and the onboard charger to share the DC link capacitor, thereby reducing the system's size and cost.
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