Intelligent digital display quasi-sine wave inverter

Why is a quasi-sine wave inverter better than a sine wave?

Sterling has invested in a new range of quasi-sine inverters because they are smaller, lower cost, offer better performance, are more efficient and more reliable than sine-wave. We, at Sterling, have always found the quasi-sine wave inverter more than adequate for general requirements in boats and vehicles.

What is a modified sine wave inverter?

In fact, the output of a modified sine wave inverter is a combination of two square waves having a phase difference of 90 degrees superimposed over each other. As a result, contrary to a square wave which has only two voltage levels (peak to peak voltages), the resultant wave has three voltage levels – positive peak, zero level and negative peak.

What is a modified sine wave?

The output waveform of such inverter can be termed as quasi sine wave. The modified sine wave take a pause (set at zero volts) before changing the polarity (as shown in the image below). Fig. 1: Signal Diagram of Modified Sine Wave The output of such inverter can be used to drive low sensitive AC devices.

What is square wave inverter?

In the previous tutorial, square wave inverter was designed. Square wave inverter was simple to design but had certain drawbacks. The AC appliances are actually designed to operate on sine wave and square wave though being AC signal does not match to an ideal sine wave.