Dual-power switching circuit

CN120810896APending Publication Date: 2025-10-17SHANGHAI CHANGLIAN ZHIRONG COMM TECH
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Patent Information

Application Number
CN202510987135.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-17
Publication Date
2025-10-17

AI Technical Summary

Technical Problem

The dual power switching circuit in the prior art is costly, bulky, and requires an expensive microprocessor or power management chip, making it difficult to be applied to the large-scale production of mid- and low-end electronic products.

Method used

The integrated design of main power supply circuit, backup power supply circuit, switching circuit, logic control circuit and power detection circuit is adopted. The voltage signal is obtained by the logic control circuit and the power detection circuit is controlled to realize the power switching function without the need for a microprocessor or additional inductor configuration.

Benefits of technology

It achieves low-cost and small-size power switching, and is suitable for the mass production of mid- and low-end electronic products.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention provides a dual-power switching circuit. A first voltage is obtained from a main power supply circuit through a logic control circuit, and a first control signal is transmitted to a power supply detection circuit according to the first voltage and a first preset voltage. Therefore, the power supply detection circuit obtains a detection result according to the first control signal, so that the control chip controls whether the standby power supply circuit outputs the second voltage or not according to the detection result. Furthermore, the switching circuit obtains the first voltage from the main power supply circuit, obtains the second voltage from the standby power supply circuit, and controls the main power supply circuit to supply power to the load or not according to the first voltage and the second voltage so as to switch between the main power supply circuit and the standby power supply circuit. Therefore, compared with the prior art, the dual-power-supply switching circuit does not need to realize a power supply switching function through a microprocessor or an MCU (Microprogrammed Control Unit) and does not need to additionally configure an inductor, so that the dual-power-supply switching circuit has the advantages of low cost and small size, and is beneficial to large-scale production of middle-end and low-end electronic products.
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