A normally closed thermal trip switch

By using a normally closed thermal trip switch with a limiting element made of low melting point material to disconnect the circuit during fault current, the problem of delayed or complex response of existing protection methods is solved, realizing fast and effective protection of power semiconductor devices, improving device lifespan and reducing costs.

CN122246001APending Publication Date: 2026-06-19XIAN SINOKE NEW ENERGY TECH CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN SINOKE NEW ENERGY TECH CO LTD
Filing Date
2024-12-18
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing power device protection methods are either slow to respond or complex in design after a fault current occurs, making it impossible to protect power semiconductor devices quickly and effectively. In particular, the fuse and the main circuit current detection method have response lag, while the parallel detection working voltage drop method is costly and has poor versatility.

Method used

The normally closed thermal trip switch is adopted. The limiting component made of low melting point material melts or softens during fault current, disconnecting the circuit of the power semiconductor device. The thermal energy generated by the fault current triggers the thermal trip switch to operate, achieving rapid protection.

Benefits of technology

It enables rapid circuit disconnection during fault current, protecting power semiconductor devices, extending their lifespan, and features a simple structure and low cost.

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Abstract

The normally closed thermal trip switch of the present invention includes a first conductor and a second conductor disposed within a housing. The first conductor, located within the housing, is elastic and cantilevered, and forms a series circuit with the second conductor through direct conductive contact under the limiting effect of a limiting member. When the thermal trip switch is activated, current flows through the series circuit formed by the direct conductive contact of the first and second conductors. The limiting member limiting the first conductor is made of a low-melting-point material lower than the melting point of the housing material. When the temperature of the first conductor reaches the melting point of the low-melting-point material, the portion of the limiting member in contact with the first conductor softens or melts, releasing the limiting effect. The first conductor, located within the housing, moves away from the second conductor under its own elastic force, causing the first and second conductors to disconnect from the direct conductive contact. The normally closed thermal trip switch of the present invention has a fast response speed and can protect power semiconductor devices.
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