Protection circuit

By designing a protection circuit that uses high-frequency and low-frequency diodes in parallel, combined with RC series branch and varistor or transient voltage suppression diodes, the problem of poor improvement in spike voltage absorption and EMI in existing absorption circuits is solved, achieving more efficient spike voltage absorption and circuit reliability improvement.

CN222673915UActive Publication Date: 2025-03-25SHENZHEN WORLD IND CO LTD
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Patent Information

Application Number
CN202421047921.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-15
Publication Date
2025-03-25
Estimated Expiration
2034-05-15

AI Technical Summary

Technical Problem

The existing RCD absorption circuit has poor absorption effect on the peak voltage, and the EMI problem is not much improved during high-frequency operation, resulting in reduced circuit reliability.

Method used

A protection circuit is designed, using a second absorption unit in parallel with high-frequency diodes and low-frequency diodes, combined with an RC series branch and a varistor or a transient voltage suppression diode as the first absorption unit, achieving more efficient peak voltage absorption and EMI improvement.

Benefits of technology

This protection circuit can absorb spike voltage more efficiently, reduce the power loss of the circuit, and improve the reliability of the circuit, effectively improving the EMI problem.

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Abstract

The utility model relates to the technical field of absorption circuits, and discloses a protection circuit which comprises a power switch tube Q1, a first absorption unit and a second absorption unit are connected between a drain electrode and a source electrode of the power switch tube Q1, the source electrode of the power switch tube Q1 is connected with the ground, and the first absorption unit and the second absorption unit are connected in parallel; according to the utility model, a more efficient peak voltage absorption effect can be achieved, the power loss of the circuit can be effectively reduced, and the reliability of the circuit can be improved at the same time.
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