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The difference in principle and application between variable frequency power supply and intermediate frequency power supply

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.03.22
Variable frequency power supply and intermediate frequency power supply are two common ways of power supply in power electronics technology, and there are some differences in their principles and applications.


AC variable frequency power supply

The working principle of intermediate frequency power supply

The intermediate frequency power supply uses a three-phase rectifier circuit with complete control function to convert AC power into DC power, and then uses a reactor to flatten to form a constant DC power supply. Then, the DC power supply is converted into a constant frequency single-phase intermediate frequency current through a single-phase inverter bridge.

The working principle of variable frequency power supply

The variable frequency power supply converts the AC power of the main power supply and outputs a pure sine wave. The output frequency and voltage can be set within a certain range. Currently, there are 60Hz frequency conversion power supplies, 60Hz power supplies, 400Hz intermediate frequency power supplies, 1000Hz frequency conversion power supplies, 1200Hz frequency conversion power supplies, 1250Hz frequency conversion power supplies, 1350Hz frequency conversion power supplies, etc. widely used in the current market.

Scope of use of variable frequency power supply

Different principles and characteristics can also affect the range of variable frequency power supplies and intermediate frequency power supplies. Variable frequency power supplies are very suitable for ideal AC power supplies because they can provide stable frequency, voltage stability, and voltage waveform without distortion. They are mainly used to evaluate the technical performance of electrical equipment, experimental testing, and so on. Variable frequency power supplies are also more commonly used in precision instruments that require high current stability.

Applicable range of intermediate frequency power supply

Intermediate frequency power supply is used for military electronic equipment, such as aviation/aircraft/airborne equipment, radar and navigation, as well as medical applications. Due to the lack of electrolysis, intermediate frequency electricity has an excitatory effect on human tissues and can gently stimulate nerves and muscles, making it highly suitable for medical treatment.

Overall, there are some differences in principles and applications between variable frequency power supplies and intermediate frequency power supplies. Variable frequency power supplies mainly adapt to different load requirements by adjusting the output frequency, and are applied in high-power motor drives and power systems. Intermediate frequency power supply converts high-frequency power supply into lower frequency output and is applied in fields such as precision instruments and communication equipment. Both have extensive applications in power electronics technology and are of great significance for the development of industry and daily life.
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