Outdoor unit for air conditioner
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Solution Overview
Problem
The existing air conditioner inverter circuits require multiple power source and control circuits for compressors and propeller fans, leading to increased costs and a higher risk of malfunction due to noise interference.
Innovation Solution
An outdoor air conditioner unit is designed with a compressor driver board and a fan driver board that share a control circuit or power source circuit, using a single DC voltage to drive both the compressor and fan motors, reducing the number of necessary circuits and minimizing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate power source circuits and control circuits are provided for each compressor and propeller fan, then each inverter circuit can operate independently, but the cost increases and the risk of malfunction due to noise increases
Solution Approach 1:
The patent combines multiple power source circuits into a single shared power source circuit that supplies power to both the compressor inverter circuit and the propeller fan inverter circuit. Similarly, separate control circuits are merged into a single shared control circuit that controls both compressors and propeller fans. This merging reduces the total number of circuits, lowering cost and reducing noise interference that would occur with multiple separate circuits.
Solution Approach 2:
The shared power source circuit is designed to universally supply power to multiple different loads (compressors and propeller fans) through a single circuit. The shared control circuit universally controls multiple compressors and propeller fans, eliminating the need for dedicated separate control circuits for each device. This multi-functionality approach reduces overall system complexity while maintaining operational capability.
2Ease of manufacture
If multiple power source circuits are provided for n compressors and m propeller fans, then each device receives dedicated power, but the cost of inverter circuits increases
Solution Approach 1:
The patent merges n power source circuits for compressors and m power source circuits for propeller fans into a single shared power source circuit. This consolidation dramatically reduces the quantity of power source circuits from (n+m) to 1, thereby reducing the cost of inverter circuits while still providing adequate power supply to all devices through the shared circuit.
3Ease of manufacture
If separate control circuits are provided for each compressor and propeller fan, then each device can be controlled independently, but the cost of inverter circuits increases
Solution Approach 1:
The patent merges (n+m) separate control circuits into a single shared control circuit that controls both compressors and propeller fans. This merging reduces the number of control circuits from (n+m) to 1, thereby reducing the cost of inverter circuits. The shared control circuit is designed to handle multiple devices through universal control logic.
Solution Approach 2:
The shared control circuit is designed with universal control capability to control multiple compressors and propeller fans through a single circuit. This multi-functional design eliminates the need for multiple dedicated control circuits, reducing overall system complexity and cost while maintaining the ability to independently control each device when needed.
Data Source
AI summary
The present invention provides an outdoor unit for an air conditioner that can be constructed at low cost while reducing risk of malfunction. The outdoor unit has a compressor; a fan motor; a compressor driver board having a compressor inverter circuit and a compressor driver circuit; and a fan driver board having a fan inverter circuit and fan driver circuit. The compressor driver board has at least either: a shared control circuit that feeds a first switching signal for a compressor to the compressor driver circuit and feeds a second switching signal for a fan to the fan driver circuit; or a shared power source circuit that steps down a first DC voltage to a second DC voltage and supplies the second DC voltage to the compressor driver circuit and to the fan driver circuit.