USB Power Supply Adaptation via Device Detection
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Solution Overview
Problem
Existing electronic apparatuses are limited by USB standards in the power they can supply, preventing the use of external devices that require higher currents, necessitating additional power sources, even after upgrading to USB 3.0 standards.
Innovation Solution
An electronic apparatus with a USB connector and device determination section that identifies USB-compatible devices, allowing power supply through additional terminals beyond USB 2.0 and USB 3.0 standards, using a switching element and voltage detection to determine and supply necessary power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If USB standards (2.0 or 3.0) are followed for power supply, then compliance with USB standards is maintained, but power supply capability is limited to 500mA or 900mA respectively
Solution Approach 1:
The power supply system is segmented into two independent paths: a first power supply path for USB 2.0 devices and a second power supply path for USB compatible devices. This segmentation allows each path to operate independently with different power capabilities, enabling the electronic apparatus to provide higher power to compatible devices while maintaining standard compliance for regular USB devices.
Solution Approach 2:
A determination section acts as an intermediary between the USB connector and power supply paths. This intermediary detects whether a connected device is a USB 2.0 device or a USB compatible device and routes power accordingly, enabling the system to adapt power supply capability based on device type without compromising USB standard compliance.
2Power
If additional power sources are prepared for external devices requiring higher current, then power requirements are met, but device complexity and user burden increase
Solution Approach 1:
The USB connector is designed with multi-functionality, incorporating both USB 2.0 and USB compatible device support within a single interface. The electronic apparatus can universally connect to different device types and automatically adapt power supply, eliminating the need for separate power sources or complex external equipment.
Solution Approach 2:
The electronic apparatus performs self-service by automatically determining the device type through detection and autonomously selecting the appropriate power supply path. This self-service capability eliminates the need for user intervention or additional external power sources, reducing both device complexity and user burden.
3Power
If USB 3.0 standards are upgraded from USB 2.0, then power supply capability increases from 500mA to 900mA, but devices requiring more than 900mA still cannot be powered
Solution Approach 1:
The power supply capability is made dynamic rather than static. The system can adaptively adjust power supply levels based on the connected device type: providing 500mA for USB 2.0 devices, 900mA for USB 3.0 devices, and higher power for USB compatible devices. This dynamic adaptation enables compatibility with high-power devices while maintaining backward compatibility.
Solution Approach 2:
The power supply parameters are changed based on device detection results. The determination section identifies USB compatible devices and triggers parameter changes in the power supply section, allowing the system to exceed standard USB power limits for compatible devices while maintaining standard compliance for regular devices.
Data Source
AI summary
An electronic apparatus includes: a DC-DC converter for supplying power to an external device connected via a USB 3.0 host connector; and a device determination section for determining, via one terminal of the USB 3.0 host connector, the external device connected to the USB 3.0 host connector. Upon determination by the device determination section that a USB compatible device is connected, the DC-DC converter supplies power to the USB compatible device.