Single-Wire Bus Current Delimiter Circuit for Power Savings
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Solution Overview
Problem
The existing single-wire communication networks, such as LIN, face challenges due to significant power dissipation caused by pull-up resistors, leading to temperature increases and circuit issues, particularly in automotive applications.
Innovation Solution
The implementation of a current delimiter circuit that limits the pull-up current when the bus transitions from a recessive to a dominant level, reducing power consumption and mitigating temperature rises by using a voltage source, master control circuit, and impedance-bias circuit to manage the single-wire bus communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pull-up resistor is used to ensure proper communication and control of the network, then communication reliability is improved, but power dissipation increases significantly
Solution Approach 1:
The patent applies dynamics by making the pull-up resistor value variable rather than fixed. The control circuit dynamically adjusts the resistance value based on the communication state: using a first resistance value during recessive level transmission and a second resistance value during dominant level transmission. This dynamic adjustment optimizes both communication reliability and power efficiency by matching the pull-up strength to the actual communication needs at different moments.
Solution Approach 2:
The patent implements parameter changes by varying the resistance value of the pull-up resistor according to different transmission states. The control circuit changes the resistance parameter from a first value to a second value based on whether the bus is at recessive or dominant level, thereby adapting the electrical characteristics to minimize power dissipation while maintaining reliable communication.
2Stability of the object's composition
If a pull-up resistor is used to maintain proper network control, then network stability is improved, but temperature increases occur in the control unit
Solution Approach 1:
The patent uses dynamics to adjust the pull-up resistor value based on communication state. During dominant level transmission when power dissipation would be highest and temperature rise most problematic, the control circuit switches to a second resistance value that reduces power consumption and heat generation, while still maintaining network stability through appropriate resistance selection.
Solution Approach 2:
The patent applies preliminary anti-action by proactively reducing the pull-up resistor value before excessive power dissipation and temperature rise occur. The control circuit anticipates high-power conditions during dominant level transmission and preemptively adjusts the resistance to minimize heat generation, preventing temperature-related problems before they arise.
3Productivity
If the master control circuit drives the bus at dominant level continuously, then data transmission efficiency is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by alternating between different resistance values based on the transmission state. The control circuit periodically switches between the first resistance value (during recessive level) and the second resistance value (during dominant level), creating a rhythm of high and low power consumption that maintains transmission efficiency while reducing overall energy usage.
Solution Approach 2:
The patent applies partial action by using a higher resistance value (second value) during dominant level transmission when strong pull-up is less critical, rather than maintaining the lower resistance value continuously. This partial reduction in pull-up strength during specific phases significantly reduces power consumption while maintaining sufficient communication performance.
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
This approach effectively reduces power dissipation and temperature increases, improving the efficiency and reliability of single-wire bus operations in master-slave environments by controlling the pull-up current, thus addressing the challenges faced by existing LIN networks.
Implementation Method 1
a corresponding pull-up current flowing via the impedance-bias circuit
Implementation Method 2
The current delimiter circuit delimits the pull-up current in response to a transition of the bus circuit from the recessive level to the dominant level
Implementation Method 3
The master control circuit transmits signals by driving a single-wire bus circuit at a dominant level and at a recessive level
Data Source
AI summary
Aspects of the present disclosure are directed to single-wire bus communications. In accordance with one or more embodiments, a pull-up current is delimited when a single-wire bus circuit is operated at a dominant level during the transmission of data on the single-wire bus circuit. This approach can be implemented to facilitate power savings, such as in applications involving a master control circuit that transmits signals by driving the single-wire bus circuit between dominant and recessive levels.