Electronic Expansion Valve Backup Power to Prevent Compressor Overload
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Solution Overview
Problem
Air conditioning systems face issues where the electronic expansion valve remains open if power to the indoor unit is blocked, leading to an overload state of the compressor and potential system breakdowns.
Innovation Solution
An air conditioning system with an indoor unit equipped with a separate power supply unit and an auxiliary power supply unit, including a capacitor, to continuously control the electronic expansion valve, ensuring it can open and close even when power is blocked, using a control unit to detect power states and generate signals for valve operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is supplied to the indoor unit to control the electronic expansion valve, then the valve can be opened and closed properly, but if power is blocked the valve remains open causing compressor overload
Solution Approach 1:
The auxiliary power supply unit is charged in advance during normal operation, so when main power is blocked, it can immediately provide power to close the electronic expansion valve without waiting for power restoration
Solution Approach 2:
The auxiliary power supply unit acts as an intermediary between the main power supply and the electronic expansion valve control circuit, ensuring continuous control capability even when main power is interrupted
2Reliability
If a separate auxiliary power supply unit is added to maintain valve control during power outages, then system reliability improves, but device complexity increases
Solution Approach 1:
The auxiliary power supply unit is integrated into the existing indoor unit structure, sharing space and control circuits with other components, thereby reducing the increase in overall device complexity
Solution Approach 2:
The auxiliary power supply unit serves multiple functions: it maintains electronic expansion valve control during power outages, provides backup power for control circuits, and prevents compressor overload, making the additional complexity worthwhile
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
Prevents the electronic expansion valve from being left open, thereby preventing compressor overload and reducing the likelihood of system breakdowns, ensuring continuous and stable operation.
Implementation Method 1
an auxiliary power supply unit charged by being connected to the power supply unit and configured to supply power to the control unit and the electronic expansion valve if power supplied into the indoor unit is blocked. Here, the auxiliary power supply unit may include a capacitor charged by being connected to the power supply unit and supplying the charged power
Data Source
AI summary
Disclosed are an air conditioning system and a method for controlling an operation thereof, whereby a charging device for charging power to be supplied into the indoor unit is employed, a chargeable control unit is separately employed, or a separate control unit connectable between the indoor unit and an electronic expansion valve is employed, thereby closing the electronic expansion valve even if power supplied into the indoor unit is blocked while controlling opening and closing of the electronic expansion valve, and additionally preventing the electronic expansion valve from being left open, resulting in prevention of an overload of a compressor within an indoor unit.