inverter

By installing a detection device in the inverter to detect the electrical parameters of the surge circuit and control the switching devices to turn off, the problem of overvoltage and current failure of the switching devices under high voltage conditions is solved, thus improving the safety and reliability of the inverter.

WO2026102975A1 Publication Date: 2026-05-21SUNGROW POWER SUPPLY CO LTD
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Patent Information

Application Number
PCT/CN2025/084315
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-11-12
Filing Date
2025-03-24
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

When the inverter detects the blocking of the traditional reactor overcurrent signal, the power semiconductor has already carried a large current before it is turned off, which leads to overvoltage and current failure of the switching device, and poor resistance to lightning surge under high voltage conditions.

Method used

A detection device is installed in the inverter to detect the electrical parameters of the surge circuit, and when the lightning surge conditions are met, the switching devices are controlled to turn off, and the DC and AC surge protection devices are activated to ensure that the switching devices are in the off state before overcurrent or overvoltage.

Benefits of technology

This effectively avoids overvoltage and overcurrent failures of switching devices caused by high voltage and high current, thus improving the safety and reliability of the inverter.

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Abstract

An inverter, comprising: a DC surge protection apparatus, a DC bus, an inverter circuit, a measurement apparatus, an AC surge protection apparatus, a measurement apparatus and a controller. A DC end of the inverter circuit is connected to a DC port of the inverter by means of the DC bus, and an AC end of the inverter circuit is connected to an AC port of the inverter. The measurement apparatuses are arranged in a surge loop of the inverter, and are configured to measure electrical parameters of the surge loop, the surge loop being a flow path of a surge current in the inverter. The controller is configured to control turn-off of switching devices in the inverter circuit when the electrical parameters measured by the measurement apparatuses satisfy a lightning surge condition, and turn on the DC surge protection apparatus and the AC surge protection apparatus after the switching devices are turned off.
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