Two-Wire Bus Voltage Modulation for Variable Battery Data Links
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Solution Overview
Problem
Existing bus systems with variable DC voltage supply face challenges in data transmission due to the need for voltage regulators and limited data rates, especially when using sync pulse architecture or constant supply voltage modulation, which increases complexity and cost.
Innovation Solution
A two-wire bus system that utilizes a modulation signal floating with the variable battery voltage, allowing data encoding using predefined voltage dips relative to the battery voltage, eliminating the need for additional voltage regulators and enabling data transmission at higher rates by adjusting modulation signals to the battery's variable level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant supply voltage is used for data transmission, then data transmission reliability is improved, but additional voltage regulators are required increasing system complexity and cost
Solution Approach 1:
The patent changes the voltage parameter from constant to variable, allowing the modulation signal to float with the battery voltage. This eliminates the need for voltage regulators while maintaining reliable data transmission by encoding data as voltage dips relative to the current battery voltage level rather than absolute voltage levels
Solution Approach 2:
The system uses the battery voltage itself as the reference level for data encoding. The modulation signal automatically adapts to the battery voltage level, making the system self-regulating without requiring external voltage regulation components
2Use of energy by moving object
If sync pulse architecture is used for data transmission, then voltage supply to bus stations is enabled, but data transmission rate is limited to low speeds
Solution Approach 1:
The patent uses periodic voltage dips (modulation signals) superimposed on the battery voltage to encode data. By using Manchester encoding and optimized pulse patterns, the system achieves higher data rates while maintaining the ability to supply voltage to bus stations through the same two-wire connection
3Stability of the object's composition
If voltage regulators are added to handle variable battery voltage, then data transmission stability is improved, but cost and device complexity increase
Solution Approach 1:
The patent changes the approach from regulating voltage to adapting to voltage variations. The modulation signal is designed to float with the battery voltage, and data is encoded as relative voltage dips rather than absolute levels, eliminating the need for voltage regulators while maintaining transmission stability
Solution Approach 2:
The system transitions from a static voltage reference to a dynamic reference that follows the battery voltage. The modulation signal automatically adjusts its level to match the current battery voltage, providing inherent adaptation to voltage variations without additional regulation components
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 efficient data transmission at up to 125 kbits/s without additional voltage regulators, reducing system complexity and cost while maintaining reliable communication across varying battery voltages.
Implementation Method 1
The data exchange from the first bus station to the second bus station now takes place using a modulation signal superposed on the variable battery voltage
Implementation Method 2
The receiving bus stations can receive the received data by means of an AC voltage decoupling of the modulation signal with subsequent digital conversion via a comparator with variable threshold following
Data Source
AI summary
A bus station, a two-wire bus system, and methods for transmitting data in a two-wire bus system. The method includes: supplying a variable battery voltage to a first bus station and a second bus station, and transmitting data from the first bus station to the second bus station using a modulation signal that is superposed on the variable battery voltage, wherein the modulation signal is adjusted to follow a level of the variable battery voltage in a predefined manner.