USB-C Charging Circuit for Accurate Charger Type Detection
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Solution Overview
Problem
Existing charging methods for electronic devices often misidentify the charging type of a USB type-C charger, leading to inefficient charging modes, such as performing low-speed charging when the charger is capable of high-speed charging due to errors in cable connections or material deterioration.
Innovation Solution
An electronic device with a power supply circuit and processor that determines the charging type and target resistance value of a USB type-C charger through a CC pin and MUIC circuit, using algorithms like BC 1.2, AFC, and QC to accurately select a corresponding charging mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the electronic device uses a fixed charging mode without determining charger type, then the device complexity is reduced, but the charging speed and efficiency deteriorate
Solution Approach 1:
The system performs preliminary detection of charger type and resistance values before initiating the charging process. The processor detects the charger type through the cable connection and determines target resistance values in advance, then selects the appropriate charging mode based on this pre-acquired information, avoiding the need for complex real-time adjustments during charging.
Solution Approach 2:
The electronic device automatically detects charger parameters and selects charging modes without user intervention. The processor autonomously determines charger type, measures resistance values, and configures the appropriate charging protocol, enabling the system to serve itself rather than requiring manual configuration or complex external control.
2Productivity
If the electronic device accurately determines charger type and selects optimal charging mode, then the charging efficiency is improved, but the device complexity increases
Solution Approach 1:
The system performs preliminary detection of charger type and resistance values before initiating the charging process. The processor detects the charger type through the cable connection and determines target resistance values in advance, then selects the appropriate charging mode based on this pre-acquired information, avoiding the need for complex real-time adjustments during charging.
Solution Approach 2:
The system continuously monitors the actual charging current and resistance values during the charging process. The processor compares the measured resistance against target resistance values for different charger types and dynamically adjusts the charging mode to maintain optimal charging efficiency, ensuring the system adapts to actual conditions rather than relying solely on initial detection.
3Measurement precision
If the electronic device measures resistance values to determine target resistance, then the measurement precision is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The system uses the cable itself as an intermediary element to detect charger type and measure resistance values. By detecting electrical characteristics through the existing charging cable connection, the system avoids the need for separate measurement devices or complex testing procedures, achieving precise resistance measurement through the natural charging interface.
Data Source
AI summary
An electronic device is provided. The electronic device includes a battery, a power supply circuit electrically connected to the battery and configured to charge the battery, a processor controlling the power supply circuit, wherein the processor, when a cable of a charger for charging is connected to the power supply circuit, determines the charging type of the charger through the cable, when the charging type has been determined, determines the target resistance value of the charger, and charges the battery by using a charging mode corresponding to the determined charging type and target resistance value.