Human Body Communication Device Switching Electrode Ground
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Human body communication devices using capacitive coupling face challenges in maintaining stable channel characteristics, leading to suboptimal communication quality due to variations in coupling capacitance and noise interference.
Innovation Solution
A human body communication device comprising a first electrode, a second electrode, a transmitting circuit, a receiving circuit, a ground electrode, and a switch, which adjusts its configuration between transmitting and receiving modes to optimize signal amplitude and noise performance by controlling the coupling capacitance and reference ground stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If capacitive coupling is used for human body communication, then signal transmission through the human body is enabled, but channel characteristics become unstable due to variations in coupling capacitance
Solution Approach 1:
The patent implements dynamic switching between two operational modes: a first mode where the second electrode connects to the ground electrode to stabilize channel characteristics, and a second mode where the second electrode connects to the second input terminal to enable signal reception. This dynamic reconfiguration allows the system to adapt to different operational requirements while maintaining stable channel characteristics through controlled capacitance management.
Solution Approach 2:
The patent changes the electrical connection state of the second electrode between two configurations: connected to ground (first mode) and connected to the differential amplifier input terminal (second mode). This parameter change in electrode connectivity allows the system to control coupling capacitance dynamically, stabilizing channel characteristics when needed while enabling signal reception at other times.
2Reliability
If the second electrode is connected to the ground electrode, then channel characteristics are stabilized, but signal reception capability is reduced
Solution Approach 1:
The patent employs dynamic mode switching to resolve this contradiction. A controller determines when to operate in the first mode (second electrode to ground) for channel stability and when to operate in the second mode (second electrode to input terminal) for signal reception. This temporal separation allows the system to achieve both goals sequentially, maintaining stable channel characteristics while enabling signal reception at appropriate times.
Solution Approach 2:
The system periodically switches between the first mode and second mode based on communication requirements. During periods when channel stability is prioritized, the second electrode connects to ground. During periods when signal reception is needed, the second electrode connects to the differential amplifier input terminal. This periodic reconfiguration allows the system to balance stability and reception quality.
3Power
If the switch connects the second electrode to the second input terminal during transmission, then signal transmission is improved, but noise interference increases
Solution Approach 1:
The patent uses dynamic switching to connect the second electrode to the second input terminal only during receiving mode when signal amplitude enhancement is needed, while connecting to ground during transmitting mode to minimize noise interference. The controller manages this switching based on operational mode, allowing the system to optimize signal transmission during one mode while reducing noise during the other mode.
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
The device enhances signal amplitude and signal-to-noise ratio, improving communication quality by strategically managing the coupling capacitance and reference ground stability during both transmission and reception modes.
Implementation Method 1
A human body communication of a capacitive coupling type exchanges a signal, based on an electrical potential difference between an electrical signal applied to the human body and the earth
Implementation Method 2
The receiving circuit includes a differential amplifier for amplifying a difference between a voltage level of a first input terminal depending on the second signal and a voltage level of a second input terminal
Implementation Method 3
The switch electrically connects the second electrode and the ground electrode in the transmitting mode and electrically connects the second electrode and the second input terminal in the receiving mode
Data Source
AI summary
Provided are a human body communication device and an operating method of the same. The human body communication device according to an embodiment of the inventive concept includes a first electrode, a second electrode, a transmitting circuit, a receiving circuit, a ground electrode, and a switch. The transmitting circuit generates a first signal in a transmitting mode and transmits the first signal to the first electrode. The receiving circuit receives a second signal from the first electrode in the receiving mode. The receiving circuit includes a differential amplifier that amplifies a difference between a voltage level of a first input terminal depending on the second signal and a voltage level of a second input terminal. The switch electrically connects the second electrode and the ground electrode in the transmitting mode, and electrically connects the second electrode and the second input terminal in the receiving mode.