Universal USB Power Supply Voltage Modulation
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Solution Overview
Problem
Existing USB power supplies restrict users by only charging devices with exclusive USB power supplies, as they rely on proprietary default D+ and D− voltage levels, forcing users to purchase specific chargers for each device.
Innovation Solution
A universal USB power supply with a DC power source, USB power interface, and a voltage modulation module that adjusts signal voltages to match default D+ and D− levels, allowing it to charge any USB-compatible device by detecting and modifying the output signals to match the required voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a USB power supply uses proprietary default D+ and D− voltage levels to identify specific devices, then the device can be charged by its exclusive power supply, but the user cannot charge the device with other USB power supplies
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the D+ and D− voltage levels based on the connected device's requirements. The power supply detects the device's default voltage levels and modifies its output parameters to match, enabling universal compatibility while maintaining reliable charging for each specific device type
Solution Approach 2:
The patent implements universality by designing a power supply that can serve multiple device types through a single unit. The system detects different device identities via D+/D− voltage levels and adapts its charging parameters accordingly, making one power supply capable of charging various USB devices that would otherwise require device-specific chargers
2Adaptability or versatility
If manufacturers use exclusive USB power supplies with proprietary voltage levels, then they can control which devices are charged, but users must purchase multiple different power supplies for different devices
Solution Approach 1:
The patent eliminates the need for multiple power supplies by creating a universal charger that detects device identity through D+/D− voltage levels and automatically configures appropriate charging parameters. This single multi-functional device replaces what would otherwise require multiple device-specific power supplies
Solution Approach 2:
The system uses feedback by continuously monitoring the D+ and D− terminal voltage levels to identify the connected device type. Based on this feedback information, the power supply automatically adjusts its output parameters to match the detected device's requirements, enabling intelligent adaptation without user intervention
3Reliability
If the charge control unit detects different voltage levels on D+ and D− terminals, then it cuts the power circuit loop to prevent charging, but this prevents universal charging capability
Solution Approach 1:
The patent applies dynamics by making the power circuit connection state variable rather than fixed. The system dynamically opens or closes the power circuit loop based on real-time detection of D+/D− voltage levels, allowing the same hardware to safely serve multiple device types by adapting its connection state to match each device's electrical characteristics
Data Source
AI summary
A universal series bus (USB) power supply has a DC power source, a USB power interface and a voltage modulation module. The USB power interface is for connecting to an electronic device that stores a default D+ voltage and a default D− voltage. The voltage modulation module connects to and outputs signals to the D+ and D− terminals of the USB power interface. If voltage levels of the output signals are not respectively identical to the default D+ and D− voltages, the voltage modulation module changes the voltage levels of the signals output to the D+ and D− terminals of the USB power interface until the voltage levels of the output signals are respectively identical to the default D+ and D− voltages. Therefore, the USB power supply may be applied to any kind of electronic device that is charged over a USB interface.