Primary overcurrent protection circuits, circuit boards and electrical equipment

By introducing current detection, filtering, and locking control modules into the primary overcurrent protection circuit, the problems of repeated restarts of the main control chip and slow protection action time are solved, achieving fast protection and controllable heat dissipation time, and improving the reliability of the circuit.

CN224438543UActive Publication Date: 2026-06-30SHENZHEN LIYUAN HAINA ENERGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHENZHEN LIYUAN HAINA ENERGY CO LTD
Filing Date
2025-08-12
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing primary overcurrent protection circuits suffer from several problems: the main control chip restarts repeatedly with short intervals, which can easily lead to overheating and damage of the full-bridge MOSFETs; the protection action time is slow; and the protection threshold is difficult to select.

Method used

A primary overcurrent protection circuit is provided, including a current detection module, a filtering module, an overcurrent judgment module, a lockout control module, and a control signal output module. It detects the primary side AC current and converts it into a DC voltage signal, performs filtering and comparison, and controls the lockout time to achieve fast protection, avoiding reliance on the selection of protection threshold.

Benefits of technology

It achieves rapid protection under primary-side overcurrent conditions, ensures that components have sufficient heat dissipation time, and greatly improves the overall reliability of the circuit.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention belongs to the field of protection circuit technology, and particularly relates to a primary overcurrent protection circuit, circuit board, and electrical device. The primary overcurrent protection circuit includes: a current detection module; a filtering module; an overcurrent judgment module, used to compare the filtered DC voltage signal with a reference voltage, and output a lockout signal when the DC voltage signal is higher than the reference voltage; a lockout control module, used to receive the lockout signal and control the lockout time, and output an unlock signal after the lockout time is reached; and a control signal output module, used to shut down the output when the lockout signal is received, and restart the output when the unlock signal is received. This invention can quickly protect primary-side components in the event of primary-side overcurrent, and by controlling the lockout time through the lockout control module, it allows the primary-side components sufficient and controllable heat dissipation time, greatly improving the overall reliability of the circuit.
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