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Low voltage control method for variable frequency air conditioner

A technology of frequency conversion air conditioner and control method, which is applied in heating and ventilation control systems, heating methods, space heating and ventilation, etc., and can solve the problems that frequency conversion air conditioners cannot operate at low voltage

Active Publication Date: 2012-07-04
安徽奥克斯智能电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problem that the above-mentioned frequency conversion air conditioner cannot operate at low pressure

Method used

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  • Low voltage control method for variable frequency air conditioner
  • Low voltage control method for variable frequency air conditioner
  • Low voltage control method for variable frequency air conditioner

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Embodiment Construction

[0023] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0024] like image 3 As shown, after the air conditioner is turned on, the low-voltage control method of the inverter air conditioner according to the present invention performs the following operations:

[0025] Step 1: start running;

[0026] Step 2: Detect the voltage U of the AC power supply;

[0027] Step 3: CPU judges whether the above voltage U≤165V is established? If it is established, go to step 7; if not, go to the next step;

[0028] Step 4: CPU judges whether the above voltage U≤176V is established? If it is established, go to step 8; if not, go to the next step;

[0029] Step 5: CPU judges whether the above voltage U≤187V is established? If it is established, go to step 9; if not, go to the next step;

[0030] Step 6: The com...

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Abstract

Provided is a low voltage control method for a variable frequency air conditioner. An alternating current power supply is rectified through a rectifying module, a power factor of the alternating current power supply is corrected through an insulated gate bipolar transistor (IGBT) module, and then the alternating current power supply is inverted through an intelligent power module (IPM) and supplied to a compressor. When voltage of the alternating current power supply is lower than 187V, a central processing unit (CPU) controls the IGBT module and the IPM to appropriately reduce the highest operation frequency of the compressor to lead the air conditioner to continue to operate. When voltage is low, the upper limit value of the operation frequency is adjusted to be low and operation frequency of the air conditioner is appropriately reduced so as to achieve the purpose of ensuring reliable work of a controller provided with the IGBT module and avoiding incapability of operating of the air conditioner.

Description

technical field [0001] The invention relates to a low-voltage control method for an inverter air conditioner, which belongs to the field of air conditioner control. Background technique [0002] figure 1 It is a control schematic diagram of a compressor of an existing frequency conversion air conditioner. Among them, the rectifier module converts alternating current into direct current; the IGBT module is also called insulated gate bipolar transistor, which adjusts the DC voltage value required by the CPU and corrects the power factor; the CPU, also known as the central processing unit, sends various The control command is executed by it; the IPM module is also called the intelligent power module, which drives and controls the compressor according to the CPU instruction; L and N are the live wire and neutral wire of the AC power supply; U, V, W are the three phases of the compressor. [0003] The AC power supply is rectified by the rectifier module and then supplied to the...

Claims

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Application Information

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IPC IPC(8): F24F11/00
Inventor 石建华龚卫强郑坚江
Owner 安徽奥克斯智能电气有限公司
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