No power outage device

The UPS system detects switch faults in the bypass circuit through voltage command changes during inverter power supply mode, addressing power interruptions and maintaining system miniaturization and cost-effectiveness.

JP7888885B1Active Publication Date: 2026-07-13TMEIC CORP (100 00)
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Patent Information

Application Number
JP2025560073
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2025-08-20
Publication Date
2026-07-13
Estimated Expiration
2045-08-20

AI Technical Summary

Technical Problem

Existing uninterruptible power supply (UPS) systems face the risk of power interruption to the load due to potential switch failures in the bypass circuit, which are not effectively detected without adding dedicated diagnostic devices, hindering miniaturization and cost reduction.

Method used

The UPS system incorporates a diagnostic circuit that diagnoses switch faults by changing the output voltage command value during inverter power supply mode, using feedback control to detect short-circuit faults in the semiconductor switch without requiring additional diagnostic devices.

Benefits of technology

This approach allows for the detection of potential switch failures in the bypass circuit, ensuring uninterrupted power supply to the load without the need for dedicated diagnostic devices, thereby maintaining system compactness and reducing costs.

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Abstract

The uninterruptible power supply (100) comprises a switch (1), an inverter (8), a control device (10), and a diagnostic circuit for diagnosing a fault in the switch (1). The switch (1) has a first terminal connected to an AC power supply (11) and a second terminal connected to a load (14). The inverter (8) is connected between the DC power supply and the second terminal and converts DC power from the DC power supply to AC power. In the inverter power supply mode, which supplies the output power of the inverter (8) to the load (14), the control device (10) turns off the switch (1) and performs feedback control of the output voltage so that the output voltage of the inverter (8) becomes the output voltage command value. The diagnostic circuit changes the output voltage command value from a reference value during the diagnostic time in the inverter power supply mode. The diagnostic circuit diagnoses a short-circuit fault in the switch (1) based on the responsiveness of the output voltage to the change in the output voltage command value.
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Citation Information

Patent Citations

  • Device for monitoring and protecting no-break power source ac switch

    JP1983069438A

  • Ac switch change-over method of uninterruptible power supply apparatus and hybrid ac switch

    JP1994225479A

  • Abnormality diagnosing method of bypass switch for uninterruptible power supply

    JP2004282812A

  • UPS system

    JP2013150415A

  • Uninterruptible power source device

    WO2017017719A1