Indoor Unit Polarity Switching for Stable Wired Remote Communication
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Solution Overview
Problem
In multi-unit air conditioning systems, malfunctions can occur due to polarity mismatch between indoor units and wired remote controllers, leading to unstable communication circuits and potential system failures.
Innovation Solution
The system incorporates a power switch and ground switch in each indoor unit, connected to a communication module, which can be turned on or off to ensure proper polarity matching with the wired remote controller, using DC power two-wire communication to prevent circuit malfunctions by controlling power and ground connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple indoor units are connected to one outdoor unit with wired remote controllers, then system versatility and coverage are improved, but communication circuit reliability deteriorates due to polarity mismatch issues
Solution Approach 1:
The patent changes the electrical parameter configuration by introducing switches that can alter the polarity connections in the communication circuit. The controller dynamically adjusts the connection state of the first and second switches to match polarities between the indoor unit and wired remote controller, thereby resolving reliability issues while maintaining system versatility
Solution Approach 2:
The patent implements dynamic polarity matching through controllable switches that can change their connection state based on detection results. The controller dynamically adjusts switch configurations to ensure proper polarity alignment, transforming a static wiring problem into a dynamically adaptable communication system
2Reliability
If polarity matching is enforced between all devices, then communication reliability is improved, but device complexity increases due to additional switches and control circuits
Solution Approach 1:
The patent implements a self-service mechanism where the controller automatically detects polarity mismatches and autonomously adjusts switch configurations to correct them. This eliminates the need for manual wiring adjustments or complex external control systems, achieving reliable communication through automated self-correction
Solution Approach 2:
The patent incorporates a feedback mechanism where the controller detects the polarity connection state between the indoor unit and wired remote controller, then uses this feedback information to control the switches appropriately. This closed-loop control ensures communication reliability while keeping the control logic centralized and manageable
3Stability of the object's composition
If switches are added to control power and ground connections, then communication stability is improved, but power management complexity increases
Solution Approach 1:
The patent merges the power management function with the existing communication control logic. The controller integrates the control of first and second switches (power and ground connections) into its existing operational framework, managing both communication and power through a unified control mechanism rather than separate systems
Data Source
AI summary
An indoor unit and an air conditioning system using the same include a first communication module to communicate with a wired remote controller, a power switch connected to a power terminal of one or the other side of the first communication module, a ground switch connected to a ground terminal of one or the other side of the first communication module to constitute a pair with the power switch, and an indoor unit controller to turn on the power switch and the ground switch when an indoor unit supplies power to the wired remote controller, and to turn off the power switch and the ground switch when another indoor unit supplies power to the wired remote controller.