Determination Circuit for Accurate Device Type Identification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As the variety of chargers increases, mobile devices face difficulties in correctly identifying connected devices due to varying resistance values at terminals, leading to incorrect device type determination.
Innovation Solution
A determination circuit that includes a first detecting unit to connect and apply voltages to power-supply terminals, a voltage applying unit to differentiate terminal impedances, and a discrimination unit to identify device types based on voltage levels at specific terminals, ensuring accurate device recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resistance values are set at predetermined terminals for device identification, then device type identification is enabled, but determination accuracy deteriorates when various charger types use different resistance values
Solution Approach 1:
The patent applies voltage to terminals and measures voltage levels instead of relying solely on resistance values. By changing the detection parameter from resistance to voltage level, the system can accurately identify device types across different charger variations without being affected by varying resistance configurations.
Solution Approach 2:
The identification process is divided into multiple steps: first detecting power supply terminal connection, then applying voltage to specific terminals, and finally measuring voltage levels at data terminals. This segmented approach allows accurate device type determination while accommodating various charger configurations.
2Measurement precision
If multiple terminals are used for data communication with impedance corresponding to device type, then device type discrimination becomes possible, but device complexity increases
Solution Approach 1:
The power supply terminals serve multiple functions: they provide power supply and also serve as voltage application points for device type identification. This multi-functionality reduces the need for separate identification terminals, thereby reducing overall device complexity while maintaining accurate device type discrimination.
Solution Approach 2:
The device under test uses its own data terminals to reflect the voltage applied to power supply terminals. By measuring the voltage level at these terminals, the system automatically obtains device type information without requiring additional active components or complex identification circuits.
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
The solution enables reliable discrimination of device types connected to mobile devices, improving determination accuracy and accommodating multiple charger standards by adjusting terminal states and voltage applications.
Implementation Method 1
a first detecting unit configured to detect whether first and second power-supply terminals are connected to each other, based on a voltage at the second power-supply terminal
Implementation Method 2
a voltage applying unit configured to, when the first and the second power-supply terminals are connected to each other, apply a first voltage to the third terminal as well as apply a second voltage to the fourth terminal
Implementation Method 3
a second detecting unit configured to detect that the first and the second terminals are connected to the third and the fourth terminals, respectively, when a voltage level at the third terminal is not equal to a level of the first voltage or when a voltage level at the fourth terminal is not equal to a level of the second voltage
Data Source
AI summary
A determination circuit includes a first detecting unit that detects whether first and second power-supply terminals are connected based on a voltage at the second power-supply terminal of a coupling unit that includes the second power-supply terminal connectable to the first power-supply terminal of a device including first and second terminals, and third and fourth terminals connectable respectively to the first and the second terminals. The determination circuit also includes a voltage applying unit that applies first and second voltages to the third and fourth terminals respectively, a second detecting unit that detects that the first and the second terminals are connected to the third and the fourth terminals, respectively, and a discrimination unit that discriminates a type of the device based on voltages at the third and the fourth terminals connected to the first and second terminals, respectively.