Bidirectional Communication Using Voltage and Current Modulation
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Solution Overview
Problem
Existing communication methods between a master and slave system over a single wire face limitations due to the need for energy storage devices like capacitors, which are costly and incompatible with digital technology, and struggle with power efficiency and noise issues in half-duplex communication.
Innovation Solution
Implementing a two-way, simultaneous digital communication system using voltage and current as distinct physical and electrical quantities, where the master signal is a digital modulation in voltage and the slave signal is a digital modulation in current, eliminating the need for capacitors and enabling full-duplex communication with a synchronous clock and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If half-duplex communication with energy storage capacitor is used, then power transmission to slave system is enabled, but manufacturing cost increases and residual ripple appears
Solution Approach 1:
The patent changes the physical parameter used for information encoding from voltage-only to a combination of voltage and current. By modulating current superimposed on the voltage signal, the system enables bidirectional communication without requiring energy storage capacitors, thus reducing manufacturing cost while maintaining power transmission capability.
2Use of energy by moving object
If half-duplex communication with energy storage capacitor is used, then power transmission to slave system is enabled, but residual ripple appears incompatible with digital technology
Solution Approach 1:
The patent introduces current modulation as an additional parameter to voltage signaling. This allows the system to transmit power and data simultaneously without using capacitors that generate residual ripple, thereby maintaining signal stability compatible with digital technology while enabling power transmission.
3Device complexity
If single wire communication is used, then device complexity is reduced, but simultaneous two-way communication is not achieved
Solution Approach 1:
The patent adds a new dimension to the communication signal by superimposing current modulation on the voltage signal transmitted over a single wire. This enables full-duplex communication where both master and slave can transmit simultaneously, achieving high communication efficiency without increasing the number of physical connections.
Solution Approach 2:
The single communication wire is made multi-functional by enabling it to carry both voltage signals for data transmission and current signals for bidirectional communication. This universal approach allows simultaneous two-way communication over a single wire, maintaining simplicity while enhancing productivity.
4Use of energy by moving object
If capacitor is used for energy storage, then power transmission is enabled, but the capacitor occupies space and increases cost on integrated circuit
Solution Approach 1:
The patent extracts and eliminates the capacitor component from the integrated circuit design by replacing it with a current-based modulation scheme. This removes the need for energy storage capacitors, freeing up IC space and reducing manufacturing cost while maintaining the ability to transmit power to the slave system.
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 allows for efficient, cost-effective, and noise-immune full-duplex data transmission on a single wire, reducing manufacturing costs and maintaining stable electrical interfaces, suitable for fast wire communications and systems with limited energy and physical connections.
Implementation Method 1
The master signal (S1) transmitted by the master transmitter to the slave transmitter is a digital modulation (logic 0 or 1) in voltage (VCL)
Implementation Method 2
The slave signal (S2) transmitted by the slave transmitter to the master transmitter is a digital modulation (logic 0 or 1) in current (ICL)
Data Source
AI summary
A two-way communication device has a master transmitter (SysM1, TRM1, SysM2, TRM2) connected to at least one slave transmitter (SysS1, TRS1, SysS2, TRS2) by an active connection wire. The master transmitter and the slave transmitter have a common reference (GND). The master transmitter can transmit a master signal (S1) to the slave transmitter and the slave transmitter can transmit a slave signal (S2) to the master transmitter.The master signal (S1) is a digital modulation in voltage.The slave signal (S2) is a digital modulation in current.