Dynamic Voltage Level Switching in USB Charging Systems
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Solution Overview
Problem
Conventional USB charging systems are limited by a standard 5V charging voltage, which is insufficient for high-power devices, leading to prolonged charging times and inability to meet the requirements of devices like displays or notebook computers.
Innovation Solution
A charging system and method that adjust the charging voltage based on predefined preset signals, allowing the power adaptor to switch between two voltage levels in response to feedback from the electronic device, enabling safer power management and improved charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional USB standard charging voltage (5V) is used, then compatibility with standard USB devices is maintained, but charging power is limited to 10W and charging time is prolonged
Solution Approach 1:
The power adaptor dynamically adjusts the charging voltage between first voltage level (5V) and second voltage level (higher than 5V) based on voltage signals exchanged with the electronic device. When the electronic device outputs a second voltage signal larger than a second preset voltage signal, the power adaptor switches to the second voltage level to provide higher power charging
Solution Approach 2:
The charging voltage parameter is changed from a fixed 5V to a variable voltage that can switch between first voltage level and second voltage level. This parameter change enables the system to adapt to different power requirements of electronic devices, providing high power charging when needed while maintaining standard compatibility
2Productivity
If charging voltage is increased to meet high-power device requirements, then charging efficiency is improved, but power management safety risks increase
Solution Approach 1:
The system implements bidirectional voltage signal communication between the power adaptor and electronic device. The power adaptor sends a first voltage signal to the electronic device, and when the electronic device outputs a second voltage signal larger than a second preset voltage signal, the power adaptor adjusts to the second voltage level. This feedback mechanism ensures safe power management by confirming device capability before high power delivery
Solution Approach 2:
Before increasing the charging voltage to the second voltage level, the system performs preliminary voltage signal exchange to confirm the electronic device can accept higher power. The power adaptor first outputs a first voltage signal, waits for the electronic device to respond with a second voltage signal, and only then adjusts to the higher voltage level, ensuring safety before high power delivery
3Adaptability or versatility
If fixed 5V charging voltage is used, then system simplicity is maintained, but adaptability to different device power requirements is reduced
Solution Approach 1:
The power adaptor is designed with multi-functionality to handle both standard 5V USB devices and high-power devices requiring higher voltage. By incorporating voltage switching capability between first voltage level and second voltage level, the single power adaptor can universally charge various types of devices without requiring separate charging solutions
Data Source
AI summary
A charging system includes a transmission line, a power adaptor, and an electronic device. The transmission line includes a first terminal and a second terminal. The power adaptor is coupled to the first terminal and generates a charging voltage and a first voltage signal. The charging voltage is at a first voltage level. The electronic device is coupled to the second terminal and receives the first voltage signal. When the first voltage signal is larger than a first preset voltage signal, the electronic device outputs a second voltage signal to the power adaptor. When the second voltage signal is larger than a second preset voltage signal, the power adaptor adjusts the charging voltage into a second voltage level.