Refrigeration Cycle Apparatus for AC and DC Power Supply Compatibility
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Solution Overview
Problem
Refrigeration cycle apparatuses are limited by their configuration to primarily use three-phase AC power supply, making it difficult to utilize high voltage DC power supply efficiently, leading to issues with motor versatility, increased size, and higher costs when attempting to operate with DC power.
Innovation Solution
A refrigeration cycle apparatus designed to operate with both AC and DC power supply, utilizing a DC power supply device and an AC power supply device to power system components, allowing high-voltage DC to be used directly for improved efficiency and simplifying the system configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If refrigeration cycle apparatus is configured to operate with three-phase AC power supply, then the apparatus can use standard commercial power sources, but it cannot efficiently utilize high voltage DC power supply
Solution Approach 1:
The inverter device is designed to accept both AC and DC power inputs and convert them to the required motor driving frequencies. The control device detects the input power type and adjusts operating parameters accordingly, enabling the same apparatus to function with different power supply types without requiring separate systems.
2Power
If large-capacity inverter devices are used to drive motors with AC power supply, then motors can be driven effectively, but the system cannot directly utilize high voltage DC power supply
Solution Approach 1:
The control device changes operating parameters based on the detected power supply type. When DC power is detected, the inverter device adjusts its switching patterns and voltage utilization to optimize motor driving performance for DC input, whereas AC input uses standard rectification and inversion patterns.
3Productivity
If the apparatus is designed for AC power supply only, then the system configuration is optimized for AC, but it increases size and cost when attempting to operate with DC power
Solution Approach 1:
The inverter device and control device are designed with universal power input capabilities. The same hardware components can handle both AC and DC inputs by adjusting control parameters, eliminating the need for separate AC-optimized and DC-optimized systems and reducing overall apparatus size and cost.
Data Source
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AI summary
A refrigeration cycle apparatus (100) is configured to be operatable with power supply of both of DC power supply and AC power supply.