Dual-Compressor Inverter Control for Low-Loss Refrigeration
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Solution Overview
Problem
Reciprocating compressors, such as linear compressors, face challenges in maintaining proper compression due to piston collisions with the cylinder wall and restricted forward movement under varying loads and voltage conditions, making it difficult to achieve efficient and controlled refrigeration in appliances like refrigerators.
Innovation Solution
A compressor control apparatus using a single inverter with multiple pairs of switching elements, where one pair is commonly connected to both compressors and operated at a lower frequency, allowing for independent or simultaneous control of the compressors based on load states, utilizing space vector pulse width modulation (SVPWM) to manage the stroke and frequency of each compressor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If compressors operate at high frequency, then compression efficiency is improved, but switching losses increase
Solution Approach 1:
The system employs periodic switching control where compressors are alternately operated or simultaneously operated at different frequencies based on load requirements. By using space vector pulse width modulation (SVPWM) with optimized switching patterns, the system achieves efficient compression while reducing switching losses through intelligent frequency management rather than continuous high-frequency operation.
2Ease of operation
If piston moves with restricted forward movement under varying loads, then compression control is improved, but reliability decreases due to piston collisions with cylinder wall
Solution Approach 1:
The system dynamically adjusts the operating frequency and stroke of compressors based on real-time load conditions. By varying the operating parameters adaptively, the piston movement is optimized for different load states, preventing restricted forward movement and collisions with the cylinder wall while maintaining effective compression control across varying operational requirements.
Data Source
AI summary
A compressor control apparatus, and a refrigerator including the same are provided. Operation of two compressors may be controlled using one inverter, thereby reducing a number of components, increasing compressor capacity, and enhancing operation efficiency of the system. Commonly used switching elements may be switched at an operating frequency, allowing the simultaneous operation of two compressors, reducing switching losses, and improving the efficiency and stability of the system.