USB Charging Control Circuit for Maintaining Pin Voltage
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Solution Overview
Problem
Portable devices with USB ports face challenges in maintaining predetermined voltage and current at data pins during battery charging, especially when the battery is in a dead or weak state, due to unready core circuits, which affects efficient charging.
Innovation Solution
A charging control circuit is integrated into the USB device, comprising a core circuit with input impedance and a switching circuit that selectively provides a predetermined voltage and current to the USB pins, ensuring the voltage and current remain intact when coupled, even when the device is under a dead battery condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the core circuit is not ready during charging procedure, then the battery can be charged from external current, but the predetermined voltage at the first I/O pin and predetermined current at the second I/O pin cannot be maintained
Solution Approach 1:
The patent implements preliminary action by enabling the charging control circuit to operate before the core circuit is fully ready. The charging control circuit is designed to selectively couple voltage sources to I/O pins in advance, ensuring that proper voltage levels are established at data pins before any data communication attempts occur, even though the core circuit may not be fully operational yet.
Solution Approach 2:
The patent applies dynamics by making the I/O pin configurations adaptive and switchable. The charging control circuit dynamically adjusts the coupling of voltage sources and current sources to different I/O pins based on the operational state of the core circuit. When the core circuit is not ready, the charging control circuit maintains voltage at data pins for charging; when the core circuit is ready, it switches to maintaining current for data communication.
Data Source
AI summary
A universal serial bus device includes: a core circuit having a first pin and a second pin, and having an input impedance looking into the core circuit from the first pin and the second pin; and a charging control circuit, coupled to the core circuit, arranged for selectively providing a voltage source to one of the first pin and the second pin; wherein the input impedance of the core circuit is configured to make the voltage source substantially intact when the voltage source is coupled to one of the first pin and the second pin.