Intelligent power module and overcurrent detection circuit thereof and household appliance

By introducing an overcurrent detection unit, a filtering unit, and an anti-interference enhancement unit into the intelligent power module, and utilizing a combination of filtering resistors and capacitors, the problem of current oscillation at the moment of power device turn-on is solved, the stability and sensitivity of overcurrent detection are improved, and equipment is prevented from being falsely triggered.

CN115684705BActive Publication Date: 2026-07-07MISILICONN SEMICON TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
MISILICONN SEMICON TECH CO LTD
Filing Date
2021-07-22
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

In existing technologies, the current oscillation of intelligent power modules at the moment of power device turn-on or turn-off can cause the overcurrent detection signal to be falsely triggered, resulting in system shutdown and affecting equipment stability and user experience.

Method used

By combining an overcurrent detection unit, a filtering unit, and an anti-interference enhancement unit, and through the design of filtering resistors, filtering capacitors, and logic gates, the filtering capability is enhanced, and the stability and sensitivity of overcurrent detection are improved.

Benefits of technology

It effectively reduces the probability of failure due to false triggering in overcurrent detection, improves the overcurrent detection sensitivity of the equipment under normal interference conditions, and ensures stable operation of the equipment.

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Abstract

This invention discloses an intelligent power module, its overcurrent detection circuit, and a home appliance. The overcurrent detection circuit includes an overcurrent detection unit for outputting an overcurrent detection signal when an overcurrent is detected in the intelligent power module; a filtering unit connected to the overcurrent detection unit for filtering out interference signals from the overcurrent detection signal; and an anti-interference enhancement unit connected to the filtering unit for generating an anti-interference enhancement signal based on the control signal of the intelligent power module, and enhancing the interference filtering capability of the filtering unit based on the anti-interference enhancement signal. Therefore, the overcurrent detection circuit of the intelligent power module in this embodiment can significantly improve the stability of overcurrent detection, effectively reduce the probability of malfunctions due to false triggering during overcurrent detection, and simultaneously ensure overcurrent detection sensitivity under normal interference conditions.
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