In layman's terms, that is the basis of the principle of electromagnetic induction of high-power electrical appliances, such as motors, compressors, relays, fluorescent lamp and so on. This kind of product needs in a startup is much bigger than current necessary to sustain the normal operation (about 3 to 7 times) the starting current. When one is in operation, for example, about 150 watts of power consumption of the refrigerator, the starting power can be up to more than 1000 watts.
In addition, due to the perceptual load, at the moment of switching power supply or disconnect the power supply will produce counter electromotive force voltage, this is far greater than the peak voltage inverter can withstand voltage, it is easy to cause the inverter instantaneous overload, affect the service life of the inverter
. Therefore, this type of electric equipment for power supply the requirement of the waveform is higher.