Device network system recognizing devices connected to an identical network system
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Solution Overview
Problem
Conventional methods for high-frequency communication in multi-air conditioner systems face issues with crosstalk due to parasitic capacitance and mutual induction, leading to incorrect system recognition where devices from different networks are mistakenly identified as part of the same system.
Innovation Solution
A device network system that uses a first processing unit to perform system recognition with low-frequency signals, while high-frequency communication signals are passed through filters to prevent recognition signals from being transmitted between networks, ensuring accurate identification of devices within the same system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency communication signals are used to increase communication speed, then communication efficiency is improved, but crosstalk and signal leakage occur due to parasitic capacitance and mutual induction
Solution Approach 1:
The patent divides the communication system into separate networks (first network and second network) with distinct frequency bands. High-frequency signals are used for communication within each network while low-frequency recognition signals are used for system identification, segmenting the frequency spectrum to prevent interference between different functions.
Solution Approach 2:
The patent applies different frequency characteristics to different signal types: high-frequency signals for communication data transmission and low-frequency signals for system recognition. This local quality differentiation ensures that communication signals and recognition signals do not interfere with each other, resolving the crosstalk issue.
2Device complexity
If relay disconnection is used to identify devices in an identical system, then system recognition is simplified, but crosstalk occurs due to parasitic capacitance between relay contacts
Solution Approach 1:
The patent replaces the mechanical relay disconnection method with an electronic frequency-based isolation approach. Instead of physically disconnecting lines using relays, the system uses low-frequency recognition signals that are blocked by high-pass filters, eliminating the need for mechanical switching and associated parasitic capacitance issues.
Solution Approach 2:
The patent changes the frequency parameter of recognition signals to low-frequency, which is blocked by high-pass filters in the communication lines. This parameter change allows recognition signals to be isolated from high-frequency communication signals, preventing crosstalk while maintaining system recognition functionality.
3Area of stationary object
If communication lines of different networks are parallel to each other, then space utilization is improved, but mutual induction causes signal leakage between networks
Solution Approach 1:
The patent uses different frequency parameters for different networks: high-frequency signals for communication and low-frequency signals for recognition. This frequency differentiation ensures that even when communication lines are parallel, signals do not leak between networks due to the frequency selectivity of high-pass filters.
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 prevents crosstalk and ensures accurate system recognition, allowing devices from different networks to communicate without being mistakenly identified as part of the same system, thereby improving communication efficiency and reliability.
Implementation Method 1
a first filter which blocks a low frequency and passes a high frequency, disposed between the first network and the second network
Implementation Method 2
disconnection by a relay according to a conventional method may cause crosstalk in which signals mutually leak due to a parasitic capacitance between contacts of the relay
Implementation Method 3
When communication lines of different networks that are not connected by a physical line are parallel to each other and a parasitic capacitance or mutual induction between the communication lines causes mutual leakage of signals
Data Source
AI summary
System recognition is performed on devices connected to an identical system without recognizing a device of a different system as a device of the identical system in high-frequency communication. In a device network system, an outdoor unit selected from among all outdoor units of a first network performs a recognition process on the outdoor units and indoor units of the first network. In the first network, communication between individual devices including the outdoor units and the indoor units is performed by using a high frequency, and the recognition process performed by the selected outdoor unit uses a recognition signal having a low frequency.