Development trend of inverter
With the rapid development of power electronics technology and the improvement of inverter control performance requirements in various industries, sine wave inverter has also been developed rapidly. At present, the development direction of inverter is mainly as follows:
High frequency means to increase the working frequency of the power switch device, which can not only reduce the volume of the whole system, but also have a good suppression effect on the audio noise, and improve the dynamic response ability of the inverter output voltage. The high frequency power switch device corresponds to the high frequency isolation transformer. The application of the high frequency isolation transformer further reduces the volume of the whole system.
RMS is the main parameter of the inverter output voltage. The high-performance inverter output voltage RMS is stable, has high waveform quality, and has strong ability to adapt to nonlinear load. Because of the sudden change of the load, the output voltage of high-performance inverter is required to have high transient response performance. Another important parameter of AC output voltage is frequency. A good inverter requires not only the effective value of output voltage to be stable, but also the frequency to be stable. The inverter with the above characteristics can be called high-performance inverter.
The current inverter technology can produce high-power products, but in high-power applications, once the inverter system fails, it will lead to system paralysis. In the system composed of small power inverter by parallel technology, the normal operation of each unit does not affect the work of other units, so the reliability of the whole system has been greatly improved.
Miniaturization is the result of high frequency, because the main way to miniaturize the inverter is to increase the switching frequency and use high frequency transformer. Another method is to improve the control method, optimize the SPWM wave spectrum to reduce the filter volume.
High input power factor
Many inverter systems use a certain topology circuit to convert DC into high frequency AC pulse, and then carry out rectification to get the required DC voltage. The output current peak will reduce the input power factor, and improving the input power factor can effectively solve the harmonic pollution caused by inverter.
Intelligence and digitalization
The digitalization of inverter is not simply to use digital devices in inverter, such as FPGA and single chip microcomputer, but the whole system depends on the computing power of digital devices and discrete control method. With the development of hardware, the speed of processor is higher and higher, which makes the inverter develop towards the direction of intelligence and digitalization.
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