Power input interface circuit and electronic equipment

By connecting diodes in series in the power input interface circuit of electronic products and setting up an anti-voltage drop branch, the input voltage is transmitted using the low on-voltage drop of the MOS tube, the voltage backflow problem between the power input interfaces is solved, and the power-on efficiency is improved and the temperature is reduced.

CN222674143UActive Publication Date: 2025-03-25SHENZHEN OCEANWING SMART INNOVATIONS TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202421264359.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-04
Publication Date
2025-03-25
Estimated Expiration
2034-06-04

AI Technical Summary

Technical Problem

Multiple power input interfaces of existing electronic products are connected in parallel to the common terminal, resulting in the input voltage being backflowed to other power input interfaces through the common terminal, affecting the access of other power supplies.

Method used

A power input interface circuit is designed, by connecting the diode in series between the input interface and the output interface, and setting up a voltage drop anti-drop branch in parallel between the positive and negative electrodes of the diode, including a MOS tube and a control sub-branch, the input voltage is transmitted using the low conduction voltage drop of the MOS tube to reduce the voltage drop when the interface is powered on.

Benefits of technology

Effectively prevent voltage backsinking, reduce the voltage drop when the interface is powered on, improve the power-on response efficiency, and reduce the heating of the power input interface.

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Abstract

The utility model discloses a power input interface circuit and electronic equipment. The power input interface circuit comprises a diode which is connected in series between an input interface and an output interface of the power input interface circuit; the voltage drop prevention branch comprises a control sub-branch and an MOS tube, the first access end and the second access end of the MOS tube are connected with the positive electrode and the negative electrode of the diode respectively, and the control sub-branch is connected between the input interface and the control end of the MOS tube in series; in response to the input voltage received by the input interface, the control sub-branch controls the MOS tube to be conducted so as to control the diode to be short-circuited, so that the input voltage is transmitted to the output interface through the MOS tube; and the conduction voltage drop of the MOS tube is smaller than the forward conduction voltage drop of the diode. The diode is connected in series between the input interface and the output interface, so that voltage is prevented from flowing back to the input interface due to disturbance of a post-stage circuit connected with the output interface; and the MOS tubes with smaller conduction voltage drop are arranged at the two ends of the diode in parallel, the diode is short-circuited when the input voltage is received, and the voltage drop generated by interface power-on is reduced.
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