Air Conditioner Communication Circuit Without Shared N-Wire Interference
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Solution Overview
Problem
Existing air conditioner communication circuits face increased costs and interference issues due to shared N wires and the use of same-sized wires for both power supply and communication, leading to communication abnormalities.
Innovation Solution
A communication circuit for indoor and outdoor units that utilizes a voltage regulation rectifying circuit to convert alternating current into direct current, eliminating the need for shared N wires and incorporating optical couplers and diodes to ensure reliable communication without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the N wire is shared for both power supply and communication, then the wire diameter can be reduced, but communication interference increases and reliability deteriorates
Solution Approach 1:
The patent divides the electrical connection into separate pathways: one for power supply (L and N wires) and another for communication (signal wires connected to terminal 3 and terminal 4). This segmentation allows the communication circuit to operate independently without interference from power supply fluctuations or other electrical apparatuses connected to the shared N wire.
Solution Approach 2:
The communication signal pathway is extracted from the power supply circuit. By connecting the communication wires to terminal 3 and terminal 4 instead of using the N wire for communication, the patent removes the communication function from the shared power circuit, eliminating the source of interference while still allowing cost-effective wiring.
2Device complexity
If voltage division by resistor is used to obtain 24V DC from 220V AC, then the circuit is simple, but strong electricity interference affects communication
Solution Approach 1:
The patent introduces an intermediary isolation mechanism through the separate terminal connections (terminal 3 and terminal 4) that bridge the indoor and outdoor units. This intermediary pathway allows communication signals to pass through without being directly exposed to the strong electricity environment of the power supply circuit, reducing interference while maintaining circuit simplicity.
3Adaptability or versatility
If multiple electrical apparatuses are connected simultaneously, then functionality is enhanced, but N wire interference causes communication abnormalities
Solution Approach 1:
The patent segments the electrical system into independent power and communication subsystems. The power supply subsystem can accommodate multiple apparatuses connected to the L and N wires, while the communication subsystem uses dedicated signal paths through terminal 3 and terminal 4, ensuring that increased connectivity does not compromise communication stability.
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 for communication and enhances reliability by avoiding interference from other apparatuses, ensuring effective communication between indoor and outdoor units.
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
Data Source
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Figure 3
AI summary
A communication circuit for indoor and outdoor units of an air conditioner and an air conditioner is disclosed. 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. The present invention has the beneficial effects that 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 the direct current to the loop, which is weak electricity to be supplied to the loop, eliminating the need to share the N wire, avoiding the interference caused by other apparatuses on communication while ensuring mutual communication between indoor and outdoor units. Additionally, the first connecting wire S' is independent from the N wire, so that a narrower wire is sufficient to meet the application requirement, and thus the cost can be reduced.