1.Increasing the overload delay off function,which can solve the sensitive protection question when solubility of electric appliances work.For example ,the user using a 300W traditional inverter can not load a 50W LED lamp,or using a 500W inverter can not load a laptop and other issues.

2.In low-power non-professional suer market,increasing polarity reversal protection function,which avoid users pick the wrong line to cause the inverter burned ,and solve the question of sales return.

3.With MCU figure controlled,output waveform and voltage are stable,frequency is precise.It is more intelligent to protect the circuit.