Universal Charging Circuit with Automatic Brand Detection
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Solution Overview
Problem
Current charging methods for mobile devices are brand-specific, leading to the need for different chargers for various brands, causing inconvenience and potential damage due to varying voltage applications on Data Positive (DP) and Data Minus (DM) pins.
Innovation Solution
A charging circuit with a universal interface, including a charging adaptation unit with multiple circuits, a voltage conversion unit, and a current detection unit, which automatically selects the appropriate charging circuit based on detected current values to ensure safe and compatible charging across different brands using a single interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different chargers are applied to charge different brands of mobile terminals, then charging compatibility is improved, but device complexity and user convenience deteriorate
Solution Approach 1:
The patent implements a universal charger that can charge multiple brands of mobile terminals by integrating multiple charging circuit types (first charging circuit for one brand, second charging circuit for another brand) within a single device. The charger automatically detects the mobile terminal brand and switches between different charging circuits, eliminating the need for users to carry multiple brand-specific chargers.
2Measurement precision
If voltage is applied on Data Positive (DP) and Data Minus (DM) for charging detection, then charging detection accuracy is improved, but harmful factors increase due to potential damage to incompatible devices
Solution Approach 1:
The patent applies voltage to DP and DM pins before actual charging to detect the mobile terminal brand in advance. Based on the detection result, the charger determines which charging circuit to use, ensuring that the correct charging protocol is applied from the start and preventing potential damage to incompatible devices.
Solution Approach 2:
The charger continuously monitors the charging current and compares it with threshold values to detect the mobile terminal brand. Based on this feedback, the charger automatically switches between different charging circuits, ensuring safe and compatible charging throughout the charging process.
3Adaptability or versatility
If multiple charging circuits are integrated in a single charger, then charging adaptability is improved, but control complexity increases
Solution Approach 1:
The charger employs automatic brand detection and circuit switching mechanisms that operate without user intervention. The control unit automatically detects the mobile terminal brand through voltage application on DP and DM pins, determines the appropriate charging circuit, and switches between circuits based on charging current feedback, simplifying the user experience despite the complex internal structure.
Data Source
AI summary
A charging circuit and a control method for charging different brands of mobile devices are disclosed. The charging circuit comprises: a universal interface connected to a mobile device to be charged; a charging adaptation unit comprising at least two types of charging circuitries, wherein the charging adaptation unit is connected to the universal interface and configured to provide a corresponding charging circuitry for the mobile device; a voltage conversion unit connected to a charging power source and configured to adjust an output voltage of the charging power source to a charging voltage for the mobile device; and a current detection unit connected between the voltage conversion unit and the charging adaptation unit and configured to detect a charging current, wherein the charging current is configured to determine the corresponding charging circuitry for the mobile device. The charging circuit and the control method thereof can charge different brands of mobile devices by means of a single universal interface, and can also charge a mobile device by means of another mobile device, which makes the use of mobile devices more convenient.