In the field of power electronic supply regulation, the variable frequency power supply is a key device for achieving precise regulation of electric energy frequency and voltage. Variable frequency power supplies with different technical architectures have their own characteristics in waveform output, energy consumption performance and application scenarios. Among them, the linear amplifier type variable frequency power supply and the SPWM switch type variable frequency power supply are two core types in the variable frequency power supply system. Relying on different working principles, these two types of variable frequency power supplies are adapted to different requirements for power supply purity and conversion efficiency respectively. Understanding the characteristics and application scenarios of the two can make the selection of variable frequency power supplies more in line with actual usage needs and give full play to the power regulation function of the variable frequency power supply.
Linear Amplifier Type Variable Frequency Power Supply: A Precision Variable Frequency Power Supply with High Purity
The linear amplifier type variable frequency power supply takes the linear amplifier circuit as its core architecture. This type of variable frequency power supply realizes the regulation of electric energy frequency and voltage through the linear amplification mode of the analog circuit, without the on-off switching of switching tubes throughout the process. Therefore, the output AC waveform is close to the ideal sine wave with extremely low harmonic distortion, making it a variable frequency power supply type with extremely high power supply purity.
This type of variable frequency power supply has a fast dynamic response speed and can quickly adjust the output parameters following the changes of the load, with excellent performance in the regulation accuracy of voltage and frequency. However, the linear amplification working mode also makes this type of variable frequency power supply have the characteristics of low conversion efficiency, large equipment volume, relatively high energy consumption, and great difficulty in power expansion, making it difficult to adapt to high-power power consumption scenarios. The linear amplifier type variable frequency power supply is mainly used in the precision testing field with strict requirements for power supply quality, such as the detection of electronic components in laboratories and the analog power supply for precision instruments in aerospace. In such scenarios, the waveform purity of the variable frequency power supply directly determines the accuracy of the test results.
SPWM Switch Type Variable Frequency Power Supply: A Cost-Effective Universal Variable Frequency Power Supply
The SPWM switch type variable frequency power supply takes the sinusoidal pulse width modulation technology as its core. This type of variable frequency power supply generates pulse waveforms arranged according to the sinusoidal law by controlling the on-off frequency and duty cycle of power switch devices, and outputs alternating current close to sine wave after filtering processing, which is the most widely used type of variable frequency power supply at present.
Compared with the linear amplifier type variable frequency power supply, the SPWM switch type variable frequency power supply has higher electric energy conversion efficiency, smaller equipment volume, stronger flexibility in power expansion, can adapt to various scenarios from low power to high power according to demand, and has lower manufacturing cost and higher cost performance. The harmonic distortion of this type of variable frequency power supply is slightly higher than that of the linear amplifier type, but it can be controlled within a reasonable range through circuit optimization, which fully meets the power supply needs of most industrial and civil scenarios. Among the variable frequency power supply series of IDEALPLUSING, the SPWM switch type products have become a common choice in industrial production, equipment testing and other scenarios by virtue of stable conversion performance and wide adaptability. This type of variable frequency power supply can be applied to many scenarios such as industrial motor speed regulation, power grid adaptation of export equipment, and aging testing of household appliances, and is a variable frequency power supply type that takes into account practicality and economy.
In summary, as the two mainstream types of variable frequency power supplies, the linear amplifier type and the SPWM switch type variable frequency power supply correspond to the usage requirements of precision and generalization respectively. When selecting a variable frequency power supply, you only need to choose the appropriate type of variable frequency power supply according to the actual scene's requirements for power supply purity, power demand and energy consumption cost, so that the performance of the variable frequency power supply can be highly consistent with the usage scenario.
