Dual dc power automatic switching circuit

By designing a dual DC power supply automatic switching circuit, intelligent switching between main and backup power supplies is achieved, solving the loss problem caused by continuous backup power supply, ensuring stable equipment operation, and improving the reliability and economy of the power supply system.

CN224502969UActive Publication Date: 2026-07-14GUANGZHOU BAOLUN ELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
GUANGZHOU BAOLUN ELECTRONICS CO LTD
Filing Date
2025-06-16
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

In existing technologies, when the main power supply suddenly fails, the backup power supply often continues to supply power in a dual DC power supply system. This leads to faster loss of the backup power supply, reduces the reliability and economy of the power supply system, and the power switching can easily cause equipment damage.

Method used

A dual DC power supply automatic switching circuit was designed. The automatic switching control of the main and backup power supplies is realized through the main power supply voltage monitoring circuit and the conversion circuit. This ensures that the main power supply is switched back to when it is restored, reducing the use of the backup power supply. The output is buffered by the delay circuit and the energy storage capacitor to avoid load power loss during power switching.

Benefits of technology

It enables seamless switching to backup power supply in the event of a main power failure, avoiding equipment damage, maximizing the use of the main power supply, extending the life of the backup power supply, and improving the reliability and economy of the power supply system.

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    Figure CN224502969U_ABST
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Abstract

The utility model relates to a kind of double direct-current power automatic switching circuit, including main power supply interface, backup power supply interface, protection module, switching module and buffer output module.The input of main power supply interface is connected main power supply, and its output is connected the switching module;The input of backup power supply interface is connected backup power supply, and its output is connected the protection module;The input of protection module is connected the backup power supply interface, and its output is connected the switching module;The input of switching module is connected the output of protection module and the output of main power supply interface, and its output is connected the buffer output module;The input of buffer output module is connected the switching module, and its output is connected load.The switching module monitors the voltage condition of main power supply in real time, once found that main power supply voltage is abnormal, quickly switch to backup power supply and supply power, and switch to main power supply and supply power after monitoring that main power supply voltage restores normal.
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