Variable-frequency control system and variable-frequency control method for heat pump

Abstract

The invention discloses a variable-frequency control system and a variable-frequency control method for a heat pump. The system comprises a temperature sensor, a single chip, a variable-frequency voltage output circuit, a frequency converter and a compressor, wherein the output end of the temperature sensor sequentially passes through the single chip, the variable-frequency voltage output circuit and the frequency converter and then is connected with the output end of the compressor. The method comprises the following steps of: acquiring an air supply temperature, and comparing the obtained air supply temperature value with a preset target temperature value to obtain an air supply temperature difference value; outputting a corresponding variable-frequency voltage to the frequency converter by the single chip through controlling the variable-frequency voltage output circuit; outputting a corresponding control frequency to the compressor by the frequency converter according to the input variable-frequency voltage; adjusting a rotational speed by the compressor according to a control frequency, and then changing the gas displacement of the compressor. The system and the method disclosed by the invention meet the needed temperature, and are capable of effectively reducing the power consumption generated during the running of a unit, and capable of being widely applied to the field of variable-frequency technologies for heat pumps.

Description

technical field [0001] The invention relates to the technical field of frequency conversion control, in particular to a heat pump frequency conversion control system and method. Background technique [0002] In the past, the frequency conversion control method for heat pumps is generally controlled by combining the frequency conversion compressor and the controller. Although this frequency conversion control method achieves the purpose of frequency conversion, it will have the following problems: [0003] 1. At present, this technology is not very mature, so it is easy to cause the temperature that cannot meet the demand after frequency conversion; [0004] 2. The cost of frequency conversion compressors on the market is relatively high, and the frequency conversion function needs to be realized. A new program must be developed for the controller. The development cycle is long, the development is difficult, and it is not easy to realize. Contents of the invention [0005]...

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Problems solved by technology

[0003] 1. At present, this technology is not very mature, so it is easy to cause the temperature that cannot meet the demand after frequency conversion;

[0004] 2. The cost of frequency conversion compressors on the market is generally high, and the frequency conversion function needs to be realized. A new program must be developed for the controller. The development cycle is long, the development is difficult, and it is not easy to realize.

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