Quasi sine wave
is divided into several kinds, from the square wave is almost the same with the square wave to the rounded trapezoidal wave is close to sine wave. We only discuss the square-wave here, this is also the most commercially available high frequency inverter can provide the waveform.
This kind of quasi sine wave inverter can be used in notebook computers, televisions, combined audio, video camera, digital camera, printer, all kinds of chargers, palm electric brain, game consoles, DVD, mobile DVD, household therapeutic apparatus, etc., the output power of the larger inverter can also be used in small electric appliances such as electric hair dryer, electric mug, kitchen appliances and so on. But to the perceptual load class appliances such as refrigerators, electric drill is unfavorable use quasi sine wave inverter power supply for a long time. Otherwise, it may be to the inverter and related electrical products damaged or shorten the expected service life. If you must use the perceptual load, it is suggested that chooses reserves bigger quasi sine wave power inverter, such as this web site provides large peak power inverter.
Here, emphatically discuss the quasi sine wave inverter is applied to the TV (traditional class monitor) examples.TV set on the inverter has the following three requirements: first, in the boot of the television, degaussing circuit demand for electrical energy have great moment, so the peak power of inverter is very demanding. For example, 25inch TV, under normal working state of power consumption of about 80 watts, and boot the instantaneous power of up to 1450 watts. Second, because the TV field frequency is equal to the ac power grid frequency, the frequency of the inverter output ac must be accurate. Third, the inverter should not produce interference to the TV set. Even can meet the above three conditions, the television when using quasi sinusoidal alternating current (ac), there will still be a few fixed picture interference lines, color will be slight slant green (using old television, partial color more serious), but the other.