Wireless communication device and air conditioner
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Solution Overview
Problem
Current wireless communication devices in air conditioners are prone to malfunctions such as system halting and disconnection due to electromagnetic interference, affecting the quality and user experience.
Innovation Solution
The reset pin of the main control chip is disconnected from the outline interface input pin, and the debug serial port input pin is connected to a high voltage level, using a fixed-value resistor to maintain stability, thereby preventing interference and ensuring program stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the reset pin is connected to the outline interface input pin, then the device can be controlled externally, but the device becomes susceptible to electromagnetic interference causing system halting and disconnection
Solution Approach 1:
The patent extracts the harmful connection between the reset pin and the outline interface input pin by disconnecting them. This separation removes the interference pathway while preserving the functional connection through the debug serial port, thereby eliminating electromagnetic interference susceptibility while maintaining external control capability.
Solution Approach 2:
The patent introduces a debug serial port as an intermediary communication channel between the outline interface and the main control chip. This intermediary allows external control commands to be transmitted through a more reliable pathway that is less susceptible to electromagnetic interference, thus maintaining ease of operation while improving system stability.
2Device complexity
If the debug serial port input pin is left floating, then the circuit is simpler, but the program running state cannot be reliably detected and the system is more prone to interference
Solution Approach 1:
The patent applies preliminary action by pre-connecting the debug serial port input pin to a high voltage level through a fixed-value resistor before any interference occurs. This proactive configuration ensures the pin is always in a known stable state, enabling reliable program detection and preventing interference-induced malfunctions while adding minimal circuit complexity.
Data Source
AI summary
A wireless communication device includes a main control chip and an outline interface. The main control chip includes a reset pin configured to reset the main control chip and a debug serial port input pin configured to read and detect a running state of a program. The debug serial port input pin is connected to a direct-current power source to receive a high voltage level input. The reset pin is disconnected from an input pin of the outline interface.