Compressor Inverter Non-Zero Vector Control to Reduce Preheating Noise
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Solution Overview
Problem
Air conditioners face challenges in accurately detecting output current during the compressor preheating process due to ringing phenomena in switching devices, leading to increased noise and power consumption.
Innovation Solution
A compressor driving apparatus is developed, incorporating a capacitor connected to a DC terminal, an inverter with three-phase switching devices, an output current detector, and a controller that outputs a switching control signal to manage the inverter, ensuring only non-zero vectors are used during preheating, thereby reducing electromagnetic noise and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional inverter control with zero vectors is used during compressor preheating, then the compressor can be heated, but electromagnetic noise and power consumption increase
Solution Approach 1:
The patent extracts and eliminates zero vectors from the switching control signal during compressor preheating mode. By removing these specific switching patterns that cause electromagnetic noise while maintaining the heating function through non-zero vectors, the solution resolves the contradiction between heating effectiveness and noise reduction.
Solution Approach 2:
The patent changes the switching control parameters by using only non-zero vectors during preheating mode. This parameter modification alters the electromagnetic characteristics of the inverter output, reducing noise generation while preserving the ability to heat the compressor through controlled current flow.
2Temperature
If traditional inverter control with zero vectors is used during compressor preheating, then the compressor can be heated, but power consumption increases
Solution Approach 1:
The patent extracts and eliminates zero vectors from the switching control signal during compressor preheating mode. By removing these specific switching patterns that cause excessive power consumption while maintaining the heating function through non-zero vectors, the solution resolves the contradiction between heating effectiveness and energy efficiency.
Solution Approach 2:
The patent changes the switching control parameters by using only non-zero vectors during preheating mode. This parameter modification optimizes the power consumption characteristics while preserving the ability to heat the compressor through controlled current flow.
3Measurement precision
If output current detection is performed during compressor preheating, then control accuracy can be improved, but detection precision decreases due to ringing phenomenon
Solution Approach 1:
The patent applies preliminary action by using current detection results from before the ringing phenomenon occurs (or from a period before preheating mode) to control the inverter during preheating. This anticipatory approach allows accurate control without being affected by the ringing noise that occurs during the actual preheating process.
Solution Approach 2:
The patent uses an intermediary approach by relying on pre-ringing current detection data as a mediator to control the preheating process. Instead of directly detecting current during the noisy preheating phase, the system uses cleaner historical data to inform control decisions, thereby avoiding the detrimental effects of ringing on measurement precision.
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
The solution effectively preheats the compressor while minimizing electromagnetic noise and power consumption by controlling the inverter to operate with non-zero vectors, enhancing the efficiency of the air conditioner's compressor driving mechanism.
Implementation Method 1
an inverter, including a plurality of three-phase switching devices, to convert DC power from the capacitor into AC power to drive a compressor motor
Implementation Method 2
an output current detector to detect output current flowing in the motor
Data Source
AI summary
A compressor driving apparatus and an air conditioner including the same, whereby the compressor driving apparatus includes a capacitor connected to a DC terminal, an inverter, including a plurality of three-phase switching devices, to convert DC power from the capacitor into AC power to drive a compressor motor, an output current detector to detect output current flowing in the motor, and a controller to output a switching control signal for controlling the inverter based on the output current, wherein the controller performs control such that some of the three-phase switching devices in the inverter are turned on or off in a compressor preheating mode.