Air Conditioner Communication Circuit With Separate Signal Wiring
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Solution Overview
Problem
Existing air conditioner communication circuits face increased costs and interference issues due to shared N wires for power and communication, leading to communication abnormalities.
Innovation Solution
A communication circuit for indoor and outdoor units of an air conditioner that includes a voltage regulation rectifying circuit, optical couplers, and diode assemblies, which converts alternating current to direct current and uses independent wires for communication, eliminating the need for shared N wires and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the N wire is shared for both power supply and communication, then the wire diameter must be the same as power supply wire, but the current in communication wire is much smaller, leading to increased cost
Solution Approach 1:
The patent divides the electrical connection into separate functions: the N wire is dedicated solely for power supply, while a separate communication wire (S' wire) is used for signal transmission. This segmentation allows each wire to be optimized for its specific function, with the communication wire having smaller diameter since it carries much smaller current, thereby reducing material cost while maintaining adaptability.
2Device complexity
If the N wire is shared for power supply and communication, then the structure is simplified, but the N wire is interfered by different apparatuses causing communication abnormity
Solution Approach 1:
The patent separates the power supply circuit and communication circuit into independent pathways. The power supply uses the N wire while communication uses a dedicated S' wire. This segmentation eliminates electromagnetic interference from high-power devices on the communication signal, ensuring stable communication without increasing overall system complexity.
Solution Approach 2:
The patent introduces an intermediary communication wire (S' wire) that acts as a dedicated channel for signal transmission between indoor and outdoor units. This intermediary pathway isolates communication signals from the noisy power supply environment, preventing interference while maintaining a relatively simple circuit structure.
3Ease of manufacture
If voltage division by resistor is used on 220V AC to obtain 24V DC, then the communication circuit can be implemented, but the circuit is interfered by strong electricity
Solution Approach 1:
The patent introduces an intermediary voltage regulation rectifying circuit that converts 220V AC to 24V DC through dedicated power conversion components rather than simple resistive division. This intermediary conversion process isolates the communication circuit from strong electrical interference present in the 220V AC line, while still enabling practical circuit implementation.
Solution Approach 2:
The patent replaces the passive resistive voltage division method with an active voltage regulation rectifying circuit that uses electronic components for AC-to-DC conversion. This substitution provides better electrical isolation and regulation, reducing harmful interference effects while maintaining ease of manufacture through standardized electronic 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
The solution reduces costs by allowing narrower wires to be used for communication and ensures reliable communication between indoor and outdoor units by avoiding interference from other apparatuses.
Implementation Method 1
a voltage regulation rectifying circuit, connected with the outdoor unit receiving module through a first connecting wire and connected with a main control board of an indoor unit. The voltage regulation rectifying circuit is configured to convert alternating current of the main control board of the indoor unit into direct current and supply electricity to the loop
Data Source
AI summary
A communication circuit for indoor and outdoor units of an air conditioner and an air conditioner. The circuit includes an outdoor unit sending module, an outdoor unit receiving module, an indoor unit receiving module, an indoor unit sending module, a weak electricity grounding end and a voltage regulation rectifying circuit, wherein the voltage regulation rectifying circuit, the outdoor unit receiving module, the outdoor unit sending module, the indoor unit receiving module, the indoor unit sending module and the weak electricity grounding end are sequentially connected in series to form a loop; the voltage regulation rectifying circuit is configured to convert alternating current of a main control board of an indoor unit into direct current, and supply electricity to the loop.