Cooling device

The cooling device addresses uneven thermal load distribution and water pressure risks in semiconductor elements by using a switching mechanism to alternate cooling water flow paths, thereby extending the lifespan and reliability of power conversion circuits.

JP2026079524APending Publication Date: 2026-05-15DENSO CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
DENSO CORP
Filing Date
2024-10-30
Publication Date
2026-05-15

AI Technical Summary

Technical Problem

Existing cooling devices for semiconductor elements in power conversion circuits exhibit uneven thermal load distribution, leading to reduced lifespan of semiconductor elements near the outlet due to lower cooling efficiency, and pose a risk of failure from increased water pressure, thereby determining the overall product life of the power conversion circuit.

Method used

A cooling device with multiple heat exchange units arranged in a stacked configuration, equipped with a switching device to alternate the flow path of cooling water between input/output pipes, controlled by a detection and fail-safe system to prevent unintended circulation and maintain even thermal load distribution.

Benefits of technology

The solution extends the product life of the power conversion circuit by ensuring uniform thermal load distribution and preventing failures from water pressure issues, enhancing the reliability and longevity of the semiconductor elements.

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Abstract

To provide a cooling device that can extend the product life of a power conversion circuit. [Solution] The cooling device comprises a plurality of heat exchange units, input / output tubes, a switching device, and a control device. The heat exchange units have flow paths through which cooling water flows, and a plurality of semiconductor elements arranged along the flow paths are stacked to cool from both sides. The input / output tubes supply and receive cooling water to the flow paths of each heat exchange unit. The switching device is configured to switch between a first mode in which cooling water is supplied to the flow paths via the input / output tubes and the cooling water that has flowed through the flow paths is supplied via the input / output tubes, and a second mode in which the cooling water that has flowed through the flow paths is supplied via the input / output tubes and the cooling water is supplied to the flow paths via the input / output tubes. The control device comprises a detection unit that detects a failure related to the mode switching between the first mode and the second mode in the switching device, and a control unit that performs fail-safe control in response to the detected failure.
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