USB Power Supply Switching Circuit to Prevent Voltage Feedback
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Solution Overview
Problem
Existing power supplies with multiple USB charging ports face inefficiencies due to the use of multiple buck converters, which require many parts, occupy large volumes, and risk voltage feedback leading to equipment failure.
Innovation Solution
A power supply design incorporating a first conversion circuit, a second conversion circuit, a control circuit, a first switching circuit, a second switching circuit, and a switching switch, which allows bidirectional disconnection of paths to prevent voltage feedback between output terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple buck converters are used to perform step-down operation for multiple USB charging ports, then the power supply can charge multiple electronic devices simultaneously, but the number of parts increases, occupying large volume and reducing efficiency due to periodic line losses
Solution Approach 1:
The patent merges multiple buck converter functions into a single buck converter by adding a switching circuit. The switching circuit enables the single buck converter to alternately supply power to different output terminals, achieving the function of multiple buck converters with fewer parts, reduced volume, and improved efficiency.
2Productivity
If multiple buck converters are used to perform step-down operation for multiple USB charging ports, then the power supply can charge multiple electronic devices simultaneously, but the volume occupied by the power supply increases
Solution Approach 1:
The patent merges multiple buck converter functions into a single buck converter by adding a switching circuit. The switching circuit enables the single buck converter to alternately supply power to different output terminals, achieving the function of multiple buck converters with fewer parts, reduced volume, and improved efficiency.
3Productivity
If multiple buck converters are used to perform step-down operation for multiple USB charging ports, then the power supply can charge multiple electronic devices simultaneously, but efficiency is reduced due to periodic line losses
Solution Approach 1:
The patent merges multiple buck converter functions into a single buck converter by adding a switching circuit. The switching circuit enables the single buck converter to alternately supply power to different output terminals, achieving the function of multiple buck converters with fewer parts, reduced volume, and improved efficiency.
4Productivity
If multiple buck converters are used to perform step-down operation for multiple USB charging ports, then the power supply can charge multiple electronic devices simultaneously, but voltage feedback from higher voltage ports can flow back into lower voltage buck converters causing equipment failure
Solution Approach 1:
The switching circuit acts as an intermediary between the buck converter and multiple output terminals. It controls the connection paths, ensuring that voltage is supplied only to the intended output terminal and preventing feedback from higher voltage ports to the buck converter or lower voltage ports, thus improving reliability.
Data Source
AI summary
A power supply includes a first conversion circuit, a second conversion circuit, a control circuit, a first switching circuit, a second switching circuit, and a switching switch. When the control circuit receives a first voltage requirement or a second voltage requirement, the control circuit controls the first switching circuit to connect a path from the first conversion circuit to the first output terminal, and disconnect a path from the first conversion circuit to the second output terminal, and the control circuit controls the switching circuit and the second switching circuit to disconnect a path from the second conversion circuit to the first output terminal and a path from the second conversion circuit to the second output terminal to prevent the first voltage from flowing back to the second conversion circuit or the second voltage from being mistakenly supplied to the first output terminal and the second output terminal.