Input-Output Circuit Charger Detection via Differential Terminal Monitoring
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Solution Overview
Problem
The increasing variety of chargers and accessories for mobile devices makes it difficult for mobile devices to determine the correct charger, as charging currents are not uniformized, leading to the need for a charging circuit that can recognize the type of charger connected.
Innovation Solution
An input-output circuit that includes a power supply detection circuit and a charger detection circuit, which detects voltages and states of differential data terminals to identify the type of charger by monitoring open, pull-up, pull-down, and short circuit conditions between the terminals, allowing precise recognition of the charger connected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common connector is used for power feeding and data communication, then the circuit scale is decreased and designability is improved, but the ability to determine the connected device type becomes difficult
Solution Approach 1:
The charger detection circuit performs preliminary detection of the charger type by monitoring voltage levels on data terminals before charging operations begin. This allows the system to identify charger characteristics in advance and configure appropriate charging parameters, resolving the contradiction by enabling device type determination without requiring additional connector complexity.
Solution Approach 2:
The patent uses the data terminals (D+ and D-) as intermediary elements for charger detection. By monitoring voltage levels and electrical characteristics on these existing data communication lines, the system can identify charger types without adding separate detection terminals, thus maintaining circuit simplicity while enabling charger recognition.
2Adaptability or versatility
If charging currents are not uniformized across different chargers, then charger versatility is improved, but the ability of the charging circuit to recognize charger type deteriorates
Solution Approach 1:
The detection circuit monitors multiple electrical parameters including voltage levels, current characteristics, and resistance values on data terminals to identify charger types. By analyzing changes in these parameters under different charging conditions, the system can accurately distinguish between various charger types despite non-uniformized charging currents, maintaining both versatility and detection precision.
3Measurement precision
If a detection circuit is added to identify charger type, then charger recognition accuracy is improved, but power consumption and circuit scale increase
Solution Approach 1:
The charger detection circuit utilizes the existing data terminal infrastructure and combines detection functions with ongoing data communication operations. By making the detection circuit multi-functional—using the same terminals for both data communication and charger identification—the system achieves accurate charger type detection without requiring separate dedicated detection pathways, thereby minimizing additional power consumption and circuit scale.
4Measurement precision
If a detection circuit is added to identify charger type, then charger recognition accuracy is improved, but circuit scale increases
Solution Approach 1:
The patent merges the charger detection function with the existing data communication circuitry. The same data terminals (D+ and D-) and associated circuit components are used for both data transmission and charger type detection. This consolidation allows accurate charger identification without increasing overall circuit scale, as the detection functionality is integrated into existing structures rather than added as separate components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise recognition of the charger type with low power consumption while preventing an increase in circuit scale, effectively managing charger detection and ensuring safe charging practices.
Implementation Method 1
a power supply detection circuit that detects power feeding to the power supply terminal from the outside
Implementation Method 2
a charger detection circuit that specifies the kind of charger by detecting voltages of the first data terminal and the second data terminal
Data Source
AI summary
A power supply detection circuit detects power feeding to a VBUS terminal from the outside. A charger detection circuit specifies the kind of charger by detecting the voltages of a DP terminal and a DM terminal. The charger detection circuit detects open, pull-up, pull-down of at least one of the DP terminal and the DM terminal or formation of a short circuit between both the terminals.