Classification and characteristics of high - frequency inverters

High-frequency inverter waveforms are divided into two categories, one is pure sine wave, which is expensive, and the other is modified sine wave, which is cheap, and it's the mainstream product in the general market. Pure sine wave inverters are generally used in precision instruments; the modified sine wave is a waveform between a sine wave and a square wave, and its output waveform has a time between the positive maximum value and the negative maximum value, but the waveform of the modified sine wave is still composed of broken lines, which belong to the category of square waves, and the continuity is not good. Modified sine wave switching inverter power supply uses PWM pulse width modulation to generate modified wave output. During the inverter process, due to the use of special intelligent circuits and high-power FETs, the power loss of the system is greatly reduced. And the soft start function is added to effectively ensure the reliability of the inverter. If the power quality requirements are not very high, the modified sine wave inverter can still meet the needs of most electrical equipment, but it still has 20% harmonic distortion, which will cause problems when running precision equipment, and also It causes high-frequency interference to communication equipment, so we generally choose pure sine wave inverters for some inductive electrical appliances and precision instruments, because the output of pure sine wave inverters is very stable, even better than the mains. Modified sine wave is used in household appliances, which can basically meet most of our electricity needs. It has high efficiency, low noise and moderate price, so it has become a mainstream product in the market.