Data Transmission Interface Voltage Detection for Connection Type
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Solution Overview
Problem
Existing data transmission interfaces, such as USB, require additional detection circuits to distinguish between connection to a PC device and a charger, leading to increased costs and inconvenience due to the need for different detection circuits across various electronic devices.
Innovation Solution
A data transmission interface using a pair of signal lines with boost resistors and a voltage-variable component, allowing the interface to determine the type of connected apparatus without external circuits by changing voltage levels, enabling switching to high or low speed operation based on the connection type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a detection circuit is added to the charger to distinguish between PC device and charger connections, then the electronic device can identify the connection type, but the cost increases and different companies' electronic devices cannot share the same detection circuit
Solution Approach 1:
The electronic device performs self-detection by measuring the voltage on the DP signal transmission line itself, without requiring any detection circuits in the charger. The device uses its own resources (processor, voltage measurement capability) to identify whether it is connected to a PC device or charger, thereby eliminating the need for external detection circuits and reducing overall system complexity and cost.
Solution Approach 2:
Instead of having the charger detect the connection type (traditional approach), the invention inverts the detection function to be performed by the electronic device itself. This reversal transfers the detection burden from the charger side to the device side, allowing universal chargers to be used across different electronic devices from various companies.
2Adaptability or versatility
If additional detection circuits are designed in chargers, then connection type can be distinguished, but costs increase and compatibility across different electronic devices is reduced
Solution Approach 1:
The invention enables a single charger design to universally support multiple types of electronic devices from different companies. By moving the detection function to the electronic device itself, the charger becomes a universal interface that does not need to be customized for different device types, thereby improving adaptability and simplifying manufacturing.
3Measurement precision
If the voltage-variable component remains connected during high-speed transmission, then the interface can detect connection type, but signal transmission quality deteriorates due to voltage division
Solution Approach 1:
The voltage-variable component dynamically changes its connection state based on the operating mode. During connection detection, it is connected to the first signal transmission line to enable voltage measurement for identifying the connected device type. During high-speed data transmission, it is disconnected and replaced by a high-impedance component that does not affect signal integrity. This dynamic switching ensures both accurate detection and reliable signal transmission.
Solution Approach 2:
The connection type detection is performed before high-speed data transmission begins. The voltage-variable component is temporarily connected during this preliminary detection phase to establish the connection type, then disconnected before the actual data transmission starts, ensuring that the subsequent high-speed transmission is not affected by the presence of the voltage-variable component.
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 differentiation between connected devices without additional charger circuits, allowing the interface to operate normally and switch between high and low speed states as needed, reducing costs and enhancing user convenience.
Implementation Method 1
the voltage-variable component is connected to the first signal transmission line, and the first signal transmission line presents a first voltage according to the external apparatus
Data Source
AI summary
A data transmission interface, for coupling to an external apparatus, including a first signal transmission line and a second signal transmission line, for transmitting a differential signal, a first resistor and a voltage-variable component, selectively connected to the first signal transmission line, and a second resistor, connected to the second signal transmission line, wherein, when the data transmission interface is coupled to the external apparatus, the voltage-variable component is connected to the first signal transmission line, and the first signal transmission line presents a first voltage in response to the external apparatus.