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Answer: The quasi-sine wave is also divided into a number of species, from almost the same with a square wave, square wave to sine wave fillet closer trapezoidal wave. Here we discuss only a square wave, which is currently the most commercially available high-frequency inverter can provide waveform. Such quasi-sine wave inverter can be used in notebook computers, televisions, modular stereos, camcorders, digital cameras, printers, various chargers, PDAs, game consoles, DVD players, mobile DVD, home treatment device, etc. The output power is larger inverters can also be used in small electric appliances such as hair dryer, electric cup, kitchen appliances and so on. But for inductive load type electrical appliances such as refrigerators, electric drills, etc. are not suitable for prolonged use of quasi-sine wave inverter. Otherwise, it will be possible for the inverter and related electrical products cause damage or shorten life expectancy. If you must use inductive load, suggested the use of reserve power of a larger quasi sine wave inverter, as this site offers large peak power inverter. Here, the focus here on quasi-sine wave inverter used in TV (traditional monitors class) examples. TV of the inverter has the following three requirements: First, the TV at boot time, degaussing circuit has a great moment of power demand, so the inverter is very high peak power requirements. For example, a 25-inch digital TV, the normal working state of the power consumption is about 80 watts, while the boot of the moment power up to 1450 watts. Second, because the television field frequency is equal to the frequency AC power, AC output frequency of the inverter must be accurate. Third, the inverter should not interfere with the TV. Even if it can satisfy the above three conditions, the use of quasi-sine wave AC TV screen when there will still be a few fixed interference pattern, the color will be slightly greenish (using the old-fashioned TV, the cast is very serious), but the other is no different.