System for controlling starting of air conditioner and control method thereof

Abstract

A system for controlling the starting of an air conditioner includes a compressor controlled in a pulse width modulation according to a duty cycle control signal, an electronic expansion valve for expanding refrigerant compressed in the compressor, a high pressure conduit connecting the exit side of the compressor and the inlet side of the electronic expansion valve, a low pressure conduit connecting the exit side of the electronic expansion valve and the inlet side of the compressor, a bypass conduit connected at its first end to the high pressure conduit and at its second end to the low pressure conduit, and a flow rate regulating valve mounted on the bypass conduit for regulating a flow rate of fluid flowing through the bypass conduit. A control unit controls the compressor during the starting of the compressor in such a way that the electronic expansion valve is open, the flow rate regulating valve is open and a duty control signal shorter than a duty control signal during a normal operation is generated.

Description

technical background [0001] The present invention relates to air conditioners. More particularly, the present invention relates to a system and method for controlling the start-up of an air conditioner using a pulse width modulated compressor. Background technique [0002] As buildings continue to grow in size, there is an increasing consumer demand for duplex air conditioners, that is, people want to connect multiple indoor units to a single outdoor unit. In such a compound air conditioner, since the outdoor unit is relatively far away from the indoor unit, the length of the refrigerant conduit connecting each indoor unit to the outdoor unit is too long, so that the amount of refrigerant filled is too large , and during start-up of the air conditioner, liquid refrigerant may enter the compressor. [0003] Specifically, if the power supply to any indoor unit is suddenly cut off during operation of a multiple air conditioner, the possibility of liquid refrigerant entering t...

AI Technical Summary

Problems solved by technology

Therefore, these compressors are not suitable for air conditioning systems in buildings where long lines must be used, and they need to be given a control environment different from that of these refrigeration systems

In addition, in the prior art, there is no control system and method for using a pulse width modulation compressor in a compound air conditioner, specifically, a control system and method for quickly and safely executing the adjustment of the air conditioner The start-up control system and method

Images