Inverter Control Unit for Simple Refrigerator Conversion
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Solution Overview
Problem
The existing methods for converting constant speed refrigerators into inverter-controlled refrigerators are complex and time-consuming, requiring significant development and assembly efforts, which hinders the frequent and quick supply of inverter-controlled refrigerators due to the need for new inverter main body control units and complicated electronic circuits.
Innovation Solution
A simple inverter-controlled refrigerator configuration that integrates an inverter control unit with a constant speed main body control unit, using a temperature detector to turn the compressor on/off, and a variable speed compressor driven by the inverter control unit, allowing the system to function as an inverter-controlled refrigerator without replacing the main body control unit, thus simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a new inverter main body control unit is developed and installed to convert a constant speed refrigerator into an inverter-controlled refrigerator, then the refrigerator can function as an inverter-controlled refrigerator with energy saving capability, but the development and assembly work requires significant time and effort, hindering frequent and quick supply
Solution Approach 1:
The invention divides the inverter control system into a separate inverter control unit that operates independently from the main body control unit. The inverter control unit receives only the on/off signal from the main body control unit and handles all inverter-specific control functions, thereby avoiding the need to replace or modify the existing main body control unit and reducing development and assembly time
Solution Approach 2:
The inverter control unit acts as an intermediary between the simple main body control unit and the inverter compressor. It translates the basic on/off signal from the main body control unit into comprehensive inverter control signals, enabling inverter functionality without requiring the main body control unit to have complex inverter control capabilities
2Adaptability or versatility
If a new inverter main body control unit is developed and installed to convert a constant speed refrigerator into an inverter-controlled refrigerator, then the refrigerator can function as an inverter-controlled refrigerator, but the assembly process becomes complicated requiring attachment of the main body control unit
Solution Approach 1:
The control system is segmented into two independent units: the existing main body control unit that handles basic on/off control, and a separate inverter control unit that handles inverter-specific control. This segmentation allows the inverter control unit to be simply connected to the existing main body control unit without requiring complex assembly or modification of the main body control unit
Solution Approach 2:
Instead of making the main body control unit complex by integrating inverter control functions into it, the invention inverts the approach by keeping the main body control unit simple and adding a separate inverter control unit. This reversal of the conventional integration approach simplifies the assembly process while achieving the same functionality
Data Source
AI summary
A simple inverter-controlled refrigerator includes temperature detector (17), constant speed main body control unit (12) whose power is turned on/off by temperature detector (17), and that can drive a constant speed compressor, inverter control unit (14) that is connected to constant speed main body control unit (12), and that is operated, based on a power on/off signal of constant speed main body control unit (12). And variable speed compressor (8) that is connected to inverter control unit (14), and that is controlled, based on an output from inverter control unit (14). Inverter control unit (14) has rotation speed setting unit (23) which is operated, based on the power on/off signal of constant speed main body control unit (12), and which is configured to set a rotation speed of variable speed compressor (8), and inverter drive circuit unit (24) which drives variable speed compressor (8) at the rotation speed set by rotation speed setting unit (23).