Sinusoidal DC conversion control method and equipment for one-drives-two air conditioner

Abstract

A sine DC frequency conversion control method and a device of single dragging two air-conditioning consists of rectification unit, smoothing unit, control unit and contravariant unit, wherein the control unit further comprises a detection resistance and a intelligent control module. The invention applies a vector weak magnetic control technique and a 180 degree sine wave DC frequency conversion mode and realizes the high frequency drive of compressor by using lower busbar voltage through adjusting d shaft current id and q shaft current iq. The invention applies the 180 degree sine wave DC frequency conversion mode to real-time detect the location of compressor rotor and real-time control through driving the driving voltage to the electromotor of the compressor, so as to real-time adjust the output torque of the compressor to maintain the balance of torque during the operation process, reduce the vibration of compressor, improve the low frequency character of the DC frequency air-condition, correct the defect in the prior technology that the torque is not be maintained in balance all the time so as to generate the vibration in operation process.

Description

technical field [0001] The invention relates to the technical field of frequency conversion control of air conditioners, and more specifically relates to the sinusoidal direct current frequency conversion drive control technology of one-to-two air-conditioner compressors. 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 air conditioners are gradually withdrawing from the market due to their low operating efficiency. The energy-saving effect of DC inverter is much better than that of traditional fixed-frequency air conditioners and AC inverter air conditioners. As we all know, fixed-frequency air conditioners consume a lot of power, while AC inverters have a narrow frequency range and low compressor efficiency, while...

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-two air-conditioning system

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