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The difference between variable frequency power supply and power frequency power supply

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.06.07
Definition

Both variable frequency power supply and industrial frequency power supply are power supply devices, but there are significant differences in their working principles and output frequencies.

Power frequency power supply usually refers to a power supply that outputs a fixed frequency (50Hz, 60Hz, etc.), with stable output voltage and current, suitable for the power supply of most conventional electrical appliances. The variable frequency power supply can control the output frequency in real time according to the needs, and the frequency can be adjusted according to the needs, thereby meeting the working needs of different devices.


variable frequency power supply

Characteristic

1. The working principle is different. Power frequency power supply mainly uses an AC power supply composed of transformers and rectifiers to output fixed frequency AC power. The variable frequency power supply uses a frequency converter to convert AC power into DC power for processing, and then uses an inverter to convert the processed DC power into the required AC power. The output frequency can be adjusted as needed.

2. The scope of application is different. Power frequency power supplies are suitable for most conventional appliances, such as televisions, refrigerators, etc., while variable frequency power supplies are suitable for occasions that require frequency adjustment, such as variable frequency air conditioners, variable frequency water pumps, etc.

3. Different energy efficiency ratios. Due to the energy-saving regulation function of variable frequency power supplies, which can control the output frequency in real time, their energy efficiency ratio is generally higher than that of power frequency power supplies.

4. The noise level varies. Variable frequency power supplies operate at high frequencies, and their output current waveform is smoother than that of power frequency power supplies, resulting in lower relative noise.

Applicable occasions

1. Industrial frequency power supplies are more common and suitable for most conventional electrical appliances. If it is necessary to improve energy efficiency or reduce noise, industrial grade variable frequency power supplies can also be considered.

2. Variable frequency power supply is suitable for occasions that require frequency adjustment, such as variable frequency air conditioners, variable frequency water pumps, etc. In addition, with the popularization of smart home devices, it is possible to consider using variable frequency power supplies in conventional household appliances, such as variable frequency washing machines, variable frequency refrigerators, etc.

Summary

The difference between variable frequency power supplies and power frequency power supplies lies in their working principle, applicable occasions, energy efficiency ratio, and noise level. When selecting a power supply, it is necessary to make appropriate choices based on actual needs to achieve better usage results.
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