Accessory Recognition via Current and Voltage Detection
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Solution Overview
Problem
Conventional portable terminals require users to manually select the type of accessory mounted in the interface unit, which is inconvenient, and existing methods for automatic recognition are error-prone.
Innovation Solution
An apparatus and method using current detection and voltage detection to automatically recognize accessories in a portable terminal's interface unit by determining the output current and voltage of a power supply, with a controller identifying the accessory type based on preset reference values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual selection method is used for accessory recognition, then user can select accessory type, but user convenience deteriorates due to repeated manual selection
Solution Approach 1:
The system performs automatic accessory recognition through self-service mechanism. The controller automatically detects the accessory type by analyzing electrical characteristics (current consumption and voltage levels) when the accessory is connected to the interface unit, eliminating the need for user intervention. The system serves itself by autonomously identifying whether a 3-pole earphone, 4-pole earphone, or other accessory is connected, thereby resolving the technical contradiction between ease of operation and time loss.
2Ease of operation
If automatic recognition method is used for accessory identification, then user convenience is improved, but recognition accuracy deteriorates due to errors in identifying accessory type
Solution Approach 1:
The patent introduces electrical characteristics (current consumption and voltage levels) as intermediary parameters for accessory identification. Instead of directly identifying the accessory type, the system measures intermediate electrical properties when the accessory is connected, then uses these measurements to infer the accessory type. This intermediary approach improves recognition accuracy by providing objective, measurable data for identification while maintaining automatic operation.
Solution Approach 2:
The system utilizes parameter changes in electrical characteristics to distinguish different accessory types. Different accessories (3-pole earphone, 4-pole earphone, TV-OUT cable) exhibit distinct current consumption patterns and voltage levels when connected. By monitoring these parameter variations, the controller can accurately identify the accessory type, thereby improving reliability while maintaining automatic recognition functionality.
3Device complexity
If simple detection method is used for accessory identification, then device complexity is reduced, but measurement precision deteriorates leading to recognition errors
Solution Approach 1:
The detection process is segmented into two distinct measurement stages: current consumption detection and voltage level detection. The controller first measures the current drawn by the connected accessory, then measures the voltage level. This segmentation allows the system to use multiple measurement dimensions for identification, improving precision while keeping each individual detection step relatively simple and manageable.
Solution Approach 2:
The system performs more measurements than a single detection method would provide. By conducting both current detection and voltage detection, the system gathers excessive data that can be used to cross-validate accessory identification. This partial or excessive action approach improves measurement precision through multiple data points while maintaining manageable device complexity through the use of standard detection 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
Enables accurate and convenient automatic recognition of accessories, improving user experience by eliminating the need for manual selection and reducing errors in identifying the type of mounted accessories.
Implementation Method 1
a current detector for determining an output current of the power supply
Implementation Method 2
a power supply for supplying microphone bias power for recognizing the accessory in the interface unit
Data Source
AI summary
A method and an apparatus for recognizing an accessory of a portable terminal are provided. The apparatus includes an interface unit in which the accessory is mounted, a power supply for supplying microphone bias power for recognizing the accessory in the interface unit, a current detector for determining an output current of the power supply, and a controller for determining whether the output current of the power supply exceeds a preset reference current when mounting of the accessory is sensed, and for recognizing a type of the accessory according to the output current of the power supply when the output current of the power supply exceeds the preset reference current. The apparatus may automatically recognize a type of an accessory connected with an interface unit to improve the convenience for a user.