Method for prompting the range of air conditioner accommodating electric network electric voltage and frequency and device thereof

Abstract

The invention relates to a method and apparatus for improving the accommodation of air-conditioners to power-grid voltage and frequency. The method includes the following steps: a. the voltage and frequency of a power-grid is tested; b1. the voltage and frequency of the detected power-grid are regulated and transmitted to the power-supply voltage of the compressor according to a proper logic; b2. at the same time, the regulated voltage and frequency are regulated and transmitted to the indoor / outdoor fan according to a proper logic. The invention is capable to automatically regulate the voltages of the compressor, the fan and other key components to achieve a relative wide voltage and frequency accommodation (220V plus or minus 20%, 45-65Hz) for the air-conditioner, and as a result, the air-conditioner can not only better adapt to stern environment of outdoor power-grid but also better adapt to different types of power-grids in a global scope. Thereby, the varieties of machine types are largely reduced; in terms of global sales, the overall operation cost of such type of air-conditioner products is saved effectively.

Description

technical field [0001] The present invention relates to an outdoor air conditioner, and more specifically relates to a method and a device for improving the adaptability range of the air conditioner to the grid voltage and frequency. Background technique [0002] The compressor is the most critical part of the air conditioner. Its working voltage range is usually only ±10% of the rated voltage, and its working frequency range is usually only ±3HZ of the rated frequency. The narrow voltage and frequency adaptation range makes ordinary air conditioners unable to adapt to the harsh outdoor power grid environment (the voltage fluctuation range of the outdoor power grid is relatively large, usually up to ±20%, and the frequency fluctuation range can reach ±5HZ); The range of frequency adaptation makes ordinary air conditioners unable to adapt to 50HZ and 60HZ power grids at the same time. Usually, different models must be used to adapt to 50HZ or 60HZ power grids respectively. ...

AI Technical Summary

Problems solved by technology

But it has a limited improvement to the range of frequency adaptation, because the optimal operating point of its design is 55HZ, and the compressor cannot work at the optimal state at 50HZ or 60HZ, resulting in reduced efficiency, and its minimum operating frequency generally cannot reach 47HZ. (50HZ-3HZ), the highest operating frequency can not reach 63HZ (60HZ+3HZ)

Of course, this 50 / 60HZ universal compressor cannot improve its voltage adaptation range

And the power of 50 / 60HZ general-purpose compressors is usually small

[0008] It is also possible to use the pre-inverter to adapt the air conditioner to a wider range of voltage and frequency, but this method has problems such as difficulty in starting the compressor, complex circuits, complex algorithms, high cost, and difficult to achieve EMC indicators.

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