What benefit does a fairly pure sine wave inverter have over a very
symetrical square wave for any given application.
First of all, essentially no one makes a squarewave inverter. What is on the
market are so-called Quasi-sine or Modified-sine types. These are basically
squarewave, but VERY IMPORTANTLY have a certain amount of dead time (10
to 15%) between half cycles. A pure squarewave inverter, if it not EXACTLY 50%
duty cycle can cause a lot of problems such as saturating inductive loads,
resulting is destrucion of the load or the inverter.
Pure sinewave inverters as compared to Quasi-sine types offer the following
advantages: Less heating of motor loads. Greater ease of starting many loads
such as motors, especially when the motor is under load. Far less EMI
(interferance on TVs etc.). Ability to power highly reactive loads with ease,
such as microwave ovens; typically a microwave oven requires a higher power
quasi-sine inverter than if you power it with a true sine device. etc. etc.
Bob.
