Two-Wire Communication Interface for Charging and Data
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Solution Overview
Problem
Current data communication systems require multiple hardware resources due to separate signal lines for charging and communication, which is inefficient and resource-intensive, especially as user-friendly interface communication becomes more important in electronic products.
Innovation Solution
Implementing a two-wire communication interface for both master and slave communication devices, allowing data transmission and supporting anti-reverse connection functions, where data is transmitted through level changes rather than grounding the signal line to zero, and utilizing components like capacitors and voltage comparators to manage voltage levels and filter glitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate signal lines are used for charging and communication, then charging and communication functions can be independently implemented, but hardware resources are wasted and device complexity increases
Solution Approach 1:
The patent combines charging and communication functions into a single interface using only two signal lines. The same two wires that carry data signals are also used to provide power, eliminating the need for separate charging hardware. This merging approach reduces device complexity while maintaining functional independence through protocol-level separation.
Solution Approach 2:
The two signal lines are designed to serve multiple functions: they can transmit data bidirectionally and simultaneously provide power transmission. The interface can operate in different modes (data-only mode and power transmission mode) depending on the connection state, making the hardware universal and adaptable to various operational requirements without needing dedicated separate lines.
2Reliability
If traditional wired communication interface is used with separate charging and communication lines, then stable power supply is ensured, but at least three lines are required and a lot of hardware support is needed
Solution Approach 1:
The patent merges power transmission and data communication into the same two signal lines. During power transmission mode, the lines carry power signals; during data mode, they carry data signals. This combining approach reduces the quantity of signal lines from three or more to exactly two, while power supply stability is maintained through proper voltage regulation and protection circuits.
Solution Approach 2:
The interface dynamically switches between different operational modes (data transmission mode and power transmission mode) based on the connection state. The system can adaptively change the function of the signal lines depending on whether a charging cable is connected, allowing the same hardware to serve multiple purposes without requiring additional dedicated lines for each function.
3Device complexity
If interface communication is designed for forward connection only, then circuit design is simplified, but user convenience is reduced when reverse connection occurs
Solution Approach 1:
The patent introduces asymmetric design elements to handle both forward and reverse connections. Diodes are strategically placed to allow current flow in the correct direction during normal operation while preventing damage during reverse connection. The detection circuit uses asymmetric voltage division to identify connection orientation, enabling the system to adapt its operation based on connection direction without complicating the overall circuit design.
Solution Approach 2:
The system is designed to detect and adapt to reverse connections by inverting its normal operation mode when reversal is detected. The voltage detection circuit identifies reverse connection through inverted voltage levels, and the system automatically adjusts its behavior to function correctly in the reversed state, thereby maintaining ease of operation regardless of connection orientation.
Data Source
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AI summary
Provided are a data communication device and system, the system comprising: a master communication device and a slave communication device, wherein the master communication device comprises: a power supply interface connecting to a direct current power supply source; a first wired communication interface composed of a first communication sub interface and a second communication sub interface, wherein the first communication sub interface is electrically coupled to the power supply interface, and the second communication sub interface is electrically coupled to a ground end of the master communication device; a first energy storage device, a first end thereof being electrically coupled to a connection point between the first communication sub interface and the power supply interface; and a control port of a first main control chip being electrically coupled to a second end of the first energy storage device; and the slave communication device comprises: a second wired communication interface composed of a first communication sub interface of the slave communication device and a second communication sub interface of the slave communication device; a second signal collection circuit, an input end thereof being electrically coupled to the first communication sub interface of the slave communication device; and a detection port of a second main control chip being electrically coupled to an output end of the second signal collection circuit.