Method for controlling variable frequency air conditioner under low voltage

A variable frequency air conditioner and control method technology, applied in heating and ventilation control systems, heating methods, space heating and ventilation, etc., can solve problems such as the inability to guarantee the operation capacity of the air conditioner, affecting the user's use experience, and slow heating or cooling effect.

Active Publication Date: 2013-01-23
NINGBO AUX ELECTRIC
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  • Abstract
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Problems solved by technology

[0006] However, the above-mentioned "voltage direct frequency limiting" control method can only limit the operating frequency to a lower fixed range under low voltage, but ...

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  • Method for controlling variable frequency air conditioner under low voltage

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Embodiment Construction

[0046] 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.

[0047] Such as figure 1 As shown, after the air conditioner is turned on, the control method of the inverter air conditioner under low voltage according to the present invention performs the following operations:

[0048] Step 1: start running;

[0049] Step 2: The controller judges whether the continuous running time of the compressor is longer than the set time T1 (5-10 minutes)? If yes, go to the next step; if not, go to step 10; the operating frequency of the inverter air conditioner is adjusted gradually. When the air conditioner starts to run, the frequency of the compressor starts to increase from 0, and it takes a certain period of time (5 to 10 minutes) In order to achieve stability; the voltage detection is performed after stable ope...

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Abstract

The invention discloses a method for controlling a variable frequency air conditioner under low voltage. The operating frequency F of a compressor is regulated according to input voltage Vin. The method comprises the following steps of: judging whether the input voltage Vin is undervoltage, if so, finding an initial operating frequency F0 according to the range in which the input voltage Vin is positioned, and initializing the compressor; judging whether the frequency boosting conditions are met, if so, boosting the frequency of the compressor according to a frequency adjustment value DeltaF which corresponds to the frequency boosting conditions; and finally, judging whether the current frequency is less than the highest frequency limit value F1 which corresponds to the range in which the input voltage Vin is positioned, and otherwise, returning to the previous step. When the input voltage of the variable frequency air conditioner is lower than a certain range of rated voltage, the variable frequency air conditioner can continuously operate and is not required to be stopped, the driving module of the compressor and other key devices can be guaranteed to be reliable, the operating capacity of the air conditioner is improved to the greatest degree, and the using experience of a user under low voltage is reduced.

Description

technical field [0001] The invention relates to a control method for an inverter air conditioner under low voltage, and belongs to the field of air conditioner control. Background technique [0002] In daily life, we will inevitably encounter fluctuations in input voltage that affect the use of household appliances. [0003] When the voltage drops to a certain limit, the air conditioner will also have a certain impact. If the operating frequency f of the air conditioner compressor does not change, the power P will not change. According to the circuit principle, P=U*I, that is, when the voltage U drops when the power P remains unchanged, the current I will rise. The larger the current I, the more the loss of the air conditioner controller, and its temperature will rise. [0004] In addition, the indoor and outdoor fans of most inverter air conditioners currently use AC motors. When the voltage drops, the speed of the indoor and outdoor fans also drops, and the heat dissipa...

Claims

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Application Information

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IPC IPC(8): F24F11/00
Inventor 刘志高郑坚江
Owner NINGBO AUX ELECTRIC
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