Compressor driving apparatus and refrigerator including the same
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Solution Overview
Problem
Existing compressor technologies face challenges in achieving accurate control and reducing noise during piston position-based operation, particularly in refrigerators, where precise control is necessary to optimize performance and minimize noise.
Innovation Solution
A compressor driving apparatus that includes an inverter for converting DC power to AC power, an output current detector, and an inverter controller. The inverter controller adjusts the piston's position by fixing it at specific distances from the discharge unit based on operation rate changes and position errors, ensuring accurate control and reducing noise by controlling collisions with the discharge unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the piston position is controlled based on operation rate changes, then control accuracy is improved, but noise increases due to piston collisions with the discharge unit
Solution Approach 1:
The patent applies dynamics by making the piston's end position adjustable rather than fixed. The controller dynamically changes the piston's end position from a first position (during normal operation) to a second position (during collision prevention mode) based on real-time operation rate changes. This dynamic adjustment allows the system to maintain control accuracy while preventing harmful piston collisions that generate noise.
Solution Approach 2:
The patent implements feedback control by continuously monitoring operation rate changes and using this information to adjust the piston's end position. When the operation rate change exceeds a predetermined threshold, the controller receives feedback about the potential collision risk and responds by changing the piston's end position to prevent the collision, thereby reducing noise while maintaining accurate control.
2Object-generated harmful factors
If the piston end position is changed to prevent collisions, then noise is reduced, but control accuracy may deteriorate
Solution Approach 1:
The system maintains control accuracy despite position changes by dynamically switching between two predefined end positions (first and second positions) based on operational conditions. Rather than continuously adjusting the position, the system uses discrete dynamic switching that preserves control precision while preventing harmful collisions when operation rate changes indicate collision risk.
Solution Approach 2:
The patent applies preliminary action by proactively changing the piston's end position before a collision can occur. When the controller detects that operation rate changes approach thresholds that would lead to collisions, it preemptively adjusts the end position to a safer second position, preventing the harmful collision before it happens while maintaining control accuracy through planned position transitions.
3Measurement precision
If the piston is fixed at a first position during normal operation, then control accuracy is maintained, but noise increases when operation rate changes cause collisions
Solution Approach 1:
The patent resolves this contradiction by making the piston's end position dynamic rather than fixed. During normal operation, the piston maintains a stable first end position for accurate control. When operation rate changes exceed predetermined thresholds indicating collision risk, the system dynamically switches the end position to a second position that prevents collisions and reduces noise, thus maintaining control accuracy while eliminating harmful noise.
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
This solution improves control accuracy and reduces noise during piston position-based operation by dynamically adjusting the piston's position in response to operation rate changes and position errors, enhancing the overall performance of the compressor and refrigerator.
Implementation Method 1
an inverter for converting direct current (DC) power into alternating current (AC) power according to a switching operation
Implementation Method 2
an output current detector for detecting an output current flowing through the motor
Data Source
AI summary
Described are a compressor driving apparatus and a refrigerator including the same. The compressor driving apparatus includes: switching elements; an inverter; an output current detector for detecting an output current flowing through a motor; and an inverter controller for controlling the inverter. The inverter controller controls the piston so that one end of the piston is fixed at a first position spaced apart from the discharge unit at stroke of the piston during a first period, controls the piston to collide with the discharge unit when a change rate in an operation rate or a position error of the compressor is equal to or greater than a predetermined value, and controls the piston so that the one end of the piston is fixed at a second position spaced apart from the discharge unit at stroke of the piston during a second period after the collision of the piston.