A power supply voltage overvoltage protection circuit, power supply and power amplifier

By designing a power supply overvoltage protection circuit, and utilizing a switching module and a control module to detect voltage values, the circuit protects automotive electronic equipment and prevents damage caused by excessive power supply voltage.

CN224329207UActive Publication Date: 2026-06-05IFLYTEK CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
IFLYTEK CO LTD
Filing Date
2025-05-07
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

In the existing technology, automotive electronic devices are easily damaged when the power supply voltage is too high, especially when the ECU power supply voltage is abnormally high under abnormal conditions, and there is a lack of effective protection measures.

Method used

A power supply overvoltage protection circuit was designed, including a switching module, an overvoltage detection and control module, and a switching control module. The circuit controls the switching module to turn on and off by detecting the power supply voltage value, thereby protecting the downstream circuit.

Benefits of technology

When the power supply voltage is too high, the switch module is automatically shut off to prevent damage to the downstream circuit. When the power supply voltage is normal, the circuit is restored to ensure safe operation.

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    Figure CN224329207U_ABST
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Abstract

The application discloses a power voltage overvoltage protection circuit, a power supply and a power amplifier. The power voltage overvoltage protection circuit comprises a switching module, wherein a first end of the switching module is connected with an input end, and a second end of the switching module is connected with an output end; an overvoltage detection control module is connected with the input end and a control end of the switching module; a switching control module is connected with the control end of the switching module; wherein when a power voltage input value at the input end is greater than or equal to a power voltage overvoltage threshold value, the overvoltage detection control module is turned on, and the switching control module controls the switching module to be turned off; when the power voltage input value at the input end is less than the power voltage overvoltage threshold value, the overvoltage detection control module is turned off, and the switching control module controls the switching module to be turned on. The application plays a role in protecting a subsequent circuit under high voltage.
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