Principle of variable frequency power supply The difference between variable frequency power supply and frequency converter
The whole circuit of the inverter power supply is composed of AC continuous current DC AC AC Filter circuit &LC and other parts, so its output voltage and current waveform are pure sine waves, very close to the ideal AC power supply. It can output grid voltage and frequency of any country in the world. The frequency converter is composed of AC current DC to AC (Modulation wave) and other circuits, and the standard name of the frequency converter should be frequency conversion governor. The output voltage waveform is pulsed square wave, and the harmonic components are many, the voltage and frequency change proportionally at the same time, can not be adjusted separately, does not meet the requirements of AC power supply. In principle, it can not be used as a power supply, and is generally only used for the speed regulation of three-phase asynchronous motors.
Frequency converter: frequency and voltage proportional constant change, used to control the three-phase motor start and operation (speed regulation) a device. Its advantages: reduce the impact on the power grid when the motor is started, save energy, improve the production process, replace the large DC motor equipment (reduce the cost of equipment, extend the life of equipment, reduce the maintenance of the motor) and so on; Disadvantages: Some harmonic interference to the grid (can be improved by adding reactors, filters, and more advanced multilevel technology)
Frequency conversion power supply and frequency converter are two kinds of products used in different occasions and different equipment. They are generally not used interchangeably, nor are they comparable in application.
Technically: there is little difference between the two hardware principles, and the frequency conversion power supply is relatively more complex. In the software convenience inverter need to master more knowledge (computer, motor, mathematics, industrial control applications, etc.), the current software with independent intellectual property rights is mainly concentrated in the world’s top 500 enterprises (Siemens,ABB, Fuji, Mitsubishi, etc.), Taiwan and the mainland inverter manufacturers technology is mainly to learn from their products. Fully homegrown Mainland software is rarely available on the market.