Sine DC frequency conversion multi-split air conditioner control system and its control method

Abstract

The present invention discloses a sine DC variable frequency one-driving-multiple air conditioner control system, comprising an outdoor unit controller, at least three indoor units and a DC variable frequency compressor, wherein, the outdoor unit controller further controls an outdoor unit intelligent control module, an intelligent frequency conversion module, an indoor-outdoor unit communication module and a temperature acquisition module; the outdoor unit intelligent control module is used for controlling the drive of the DC variable frequency compressor. The present invention also discloses a sine DC variable frequency one-driving-multiple air conditioner control method, which first calculates the needed frequency of the DC variable frequency compressor, and then calculates the instantaneous position and the velocity information of a DC variable frequency compressor rotor, and finally drives the DC variable frequency compressor. The present invention increases the service efficiency of the compressors of one-driving-multiple air conditioners, improves the high frequency characteristics and low frequency characteristics of air conditioners, and ensures that one-driving-multiple air conditioners save more energy.

Description

technical field [0001] The invention relates to the technical field of DC frequency conversion air conditioners, in particular to a sinusoidal DC frequency conversion one-drag multi-air conditioner control system and a method thereof. Background technique [0002] With the coming of the worldwide energy crisis, governments of various countries are actively promoting energy-saving and consumption-reducing technologies for the purpose of sustainable economic development. As the main equipment for household electricity consumption, traditional fixed-frequency air conditioners and AC inverter air conditioners are gradually withdrawing from the market due to their low operating efficiency. DC inverter air conditioners are more and more popular among users because of their good energy saving, precise temperature control, ultra-low temperature start-up, and rapid heating. [0003] One-to-many air conditioners are one outdoor unit with multiple indoor units (greater than or equal t...

AI Technical Summary

Problems solved by technology

However, since the zero-crossing detection method can only detect some specific points, and as the motor speed changes in a wide range, the variable frequency of the back EMF will also change, and the filter device in the detection circuit will bring a certain phase shift, which will It will greatly affect the accuracy of detecting zero-crossing points; at the same time, due to the reverse current effect of the freewheeling diode on the power device, it will also have a certain impact on the detection of zero-crossing points under high current conditions, and this detection method needs to be detected. It can only be used in the 120-degree frequency conversion mode, but not in the 180-degree sine wave frequency conversion mode, which greatly reduces the utilization efficiency of the compressor, and the low-frequency characteristics of the 120-degree control mode are not good, and the vibration is large, which means This makes this control mode unable to give full play to the characteristics of the DC inverter compressor, and also makes it impossible to give full play to the advantages of the one-to-multiple air-conditioning system

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