A power-on control circuit, device, and method that prevents system failure

By using a power enable control circuit composed of passive components and discrete semiconductor devices, and taking advantage of the DC blocking and AC passing characteristics of coupling capacitors, the static signal of the main controller is automatically identified and cut off when the main controller fails. This solves the problem of continuous power supply for safety-sensitive loads in the prior art and achieves low-cost and high-reliability fault protection.

CN122159137APending Publication Date: 2026-06-05GUANGDONG TELEPOWER TELECOM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGDONG TELEPOWER TELECOM TECH
Filing Date
2026-02-06
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing technologies cannot effectively identify static enable signals when the main controller fails, causing safety-sensitive loads to remain powered on, leading to safety hazards such as overheating, fire, or malfunction. Moreover, existing solutions are costly, software-dependent, slow in response, bulky, or power-consuming, making it difficult to meet the requirements of low cost, miniaturization, high reliability, and purely hardware-based autonomous protection.

Method used

The power enable control circuit, which is composed of passive components and discrete semiconductor devices, utilizes the DC blocking and AC passing characteristics of coupling capacitors to allow only periodically changing pulse signals to pass through. The main switching device automatically turns off when the control signal stagnates at a constant DC, thus achieving fault self-protection.

Benefits of technology

Automatically cuts off power to the load when the main controller malfunctions, avoiding safety hazards, reducing costs and power consumption, and improving reliability and response speed. It is suitable for resource-constrained scenarios and is applicable to smart wearables, power tools, and IoT terminals.

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Abstract

The application provides a power supply enable control circuit, device and method for preventing system failure, relates to the technical field of control circuits, and is constructed by adopting passive elements and discrete semiconductor devices. When the main controller normally works, a periodic pulse signal output by the main controller is transmitted to a driving unit through a coupling capacitor, so that the main switching device is turned on, and the load obtains power supply. When the main controller fails and the control signal is stalled at a constant direct current level, the coupling capacitor blocks the invalid signal due to the direct current blocking characteristic, the driving unit cannot maintain effective driving, the main switching device is turned off, and the power supply end is automatically cut off. Therefore, the failure self-protection function of the safety sensitive load is realized without software intervention and a special monitoring chip, and the safety hidden danger caused by the continuous power supply due to the abnormal controller is effectively avoided.
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