Power conversion device for energy storage systems

The power conversion device uses a cutoff and detection circuit to accurately detect the stoppage of the power conversion circuit, addressing the challenge of offset errors in current sensors and ensuring reliable shutdown during charging abnormalities.

JP2026111766APending Publication Date: 2026-07-06TOYOTA JIDOSHA KK
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Patent Information

Application Number
JP2024227175
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2026-07-06

AI Technical Summary

Technical Problem

Existing power conversion devices struggle to accurately detect the stoppage of the output of a power conversion circuit due to offset errors in current sensors, making it difficult to confirm when the output has truly stopped, and the use of low-tolerance current sensors is costly and hard to manage.

Method used

A power conversion device with a cutoff circuit and detection circuit that cuts off power supply to the drive circuit and outputs a cutoff signal to a control device, allowing for precise detection of output stoppage through a comparison of voltage levels, independent of current sensor accuracy.

Benefits of technology

Enables accurate detection of power conversion circuit stoppage, ensuring reliable and efficient shutdown of charging operations when abnormalities occur, thereby preventing excessive charging.

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Abstract

To provide a power conversion device for a power storage device that can more accurately detect output failures in the power conversion circuit. [Solution] The power conversion device of the energy storage device comprises a first control unit (MCU1), a power conversion circuit configured to output power to the energy storage device, a drive circuit that generates a drive signal for the power conversion circuit using power supply power (DCDC_POW), a cutoff circuit 60 that cuts off the supply of power supply power to the drive circuit, and a detection circuit 70. The detection circuit 70 is configured to output a cutoff signal to the first control unit (MCU1) based on the completion of the cutoff by the cutoff circuit 60. The cutoff signal indicates that the supply of power supply power to the drive circuit has been cut off.
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