Power Tool Wiring Bus for Shared Power and Data Communication
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Solution Overview
Problem
The complexity of power tools with many internal modules leads to intricate production processes and low reliability due to numerous power and transmission lines, affecting communication reliability and user experience.
Innovation Solution
The implementation of transmission lines capable of transmitting both power and communication data at frequencies greater than or equal to 1 kHz, with multiple function modules electrically connected and equipped with microcontrollers for selective data transmission and reception, using handshake signals, bus state determination, and token-based data communication methods to ensure reliable data exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate power lines and transmission lines are used for each function module, then each module can be independently connected, but the number of lines increases leading to complex production processes and low reliability
Solution Approach 1:
The patent combines power transmission and data communication functions into a single transmission line, eliminating the need for separate power lines and communication lines for each function module. This merging reduces the total number of lines while maintaining reliable communication between the control unit and multiple function modules.
Solution Approach 2:
The transmission line is designed to serve multiple functions simultaneously: it transmits both power and communication data between the control unit and various function modules. This multi-functional approach reduces the overall complexity of the electrical connection system while improving reliability.
2Ease of manufacture
If many harnesses are used to connect multiple function modules, then all modules can be electrically connected, but the production process becomes complex and reliability decreases
Solution Approach 1:
The patent merges multiple separate harnesses into a single integrated transmission line that carries both power and communication signals. This consolidation simplifies the manufacturing process by reducing the number of connection components while enhancing reliability through fewer potential failure points.
Solution Approach 2:
The patent extracts the communication data transmission function from separate communication lines and integrates it into the existing power transmission line. This extraction and integration approach eliminates the need for additional harnesses while maintaining reliable electrical connections for both power and data.
3Device complexity
If separate power and communication lines are used for each module, then clear signal transmission is achieved, but the number of lines increases leading to complex system structure
Solution Approach 1:
The patent combines power and communication data transmission into a single transmission line, significantly reducing system structure complexity. The use of differential signaling and handshake protocols ensures that data transmission accuracy is maintained despite the shared medium.
Solution Approach 2:
The patent introduces handshake signals as an intermediary mechanism to coordinate data transmission over the shared transmission line. This mediator approach ensures accurate data exchange between the control unit and function modules while using the same physical medium for both power and communication.
Data Source
AI summary
A power tool includes transmission lines capable of transmitting power or communication data; and multiple function modules electrically connected to the transmission lines and capable of selectively receiving the communication data from the transmission lines or transmitting the communication data to the transmission lines. A transmission frequency at which the transmission lines transmit the communication data is greater than or equal to 1 kHz.