USB Charger Dynamic Voltage Control for Bulk Charging
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Solution Overview
Problem
Existing USB chargers face limitations in achieving bulk charging due to voltage drop caused by USB signal wire impedances, restricting the maximum input current to 1.5 A, which hinders efficient charging of mobile terminals.
Innovation Solution
A USB charger and mobile terminal system employing bidirectional communication through pulse signals to adjust voltage output, allowing the charger to increase output current without increasing input current, by determining the maximum output capability and load capability of both devices and adjusting charging settings accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the output current of the charging circuit is increased to improve charging efficiency, then the charging speed increases, but the voltage drop due to USB signal wire impedances increases, leading to decreased circuit output efficiency
Solution Approach 1:
The patent implements dynamic voltage adjustment where the USB charger actively modifies its output voltage based on real-time communication with the mobile terminal. The logic control unit receives voltage requirements from the terminal and dynamically adjusts the charging voltage to compensate for wire impedance losses, enabling high current charging without efficiency degradation.
Solution Approach 2:
The patent establishes a feedback mechanism through bidirectional communication between the USB charger and mobile terminal. The terminal communicates its voltage requirements to the charger, which then adjusts its output accordingly. This closed-loop feedback system ensures optimal charging efficiency by compensating for voltage drops caused by wire impedances.
2Productivity
If the input current of the charging circuit is increased to achieve bulk charging, then the charging efficiency improves, but the voltage drop increases due to USB signal wire impedances
Solution Approach 1:
The patent changes the voltage parameter dynamically during charging operations. By adjusting the output voltage based on communication with the mobile terminal, the system compensates for voltage drops caused by wire impedances, allowing high current charging without suffering from excessive voltage loss.
3Reliability
If the maximum input current is limited to 1.5 A to reduce voltage drop effects, then circuit stability is maintained, but bulk charging cannot be achieved
Solution Approach 1:
The patent transitions from static current limiting to dynamic current control. Through bidirectional communication, the charger and terminal negotiate optimal charging parameters, allowing the system to safely exceed the traditional 1.5A limit when conditions permit, thereby achieving bulk charging while maintaining circuit stability through active monitoring and adjustment.
Data Source
AI summary
A USB charger, a mobile terminal, and a charging method are provided. The USB charger for charging a mobile terminal, includes a first logic control unit through which bidirectional communication is established between the USB charger and the mobile terminal, wherein the first logic control unit is configured to: send, to the mobile terminal, a first signal which includes a maximum output capability of the USB charger; receive, from the mobile terminal, a second signal which indicates magnitude of a voltage requested by the mobile terminal; and adjust a voltage output from the USB charger to be consistent with the voltage requested by the mobile terminal. Accordingly, the USB charger and the mobile terminal can communicate with each other through a single signal wire. Thus, the voltage output from the USB charger can be intelligently controlled, so as to charge the mobile terminal in a fast, safe, and simply way.