Can a sine wave inverter be equipped with an amplifier

A sinewave inverter using class-D amplifier functions by converting a small sinewave input frequency into equivalent sine PWMs, which is finally processed by an H-bridge BJT driver for generating the mains sinewave AC output from a DC battery source. The working principle of a class-D amplifier is actually simple yet extremely effective.

The Modified Square Wave also known as the Modified Sine Wave Inverter produces square waves with some dead spots between positive and negative half-cycles at the output. The cleanest utility supply like power source is provided by Pure Sine Wave inverters.

The frequency of the above sine wave generator is around 250 Hz, but we will need this to be around 50 Hz, which can be changed by altering the values of C1---C3, and R3, R4 appropriately. Once, the frequency is set, the output of this circuit could be linked with the C1, C2 input of the inverter board.

The transformer finally transforms the sine equivalent SPWM into 220V or 120V sine wave AC, whose waveform is exactly in accordance with the input sine wave signal from the oscillator. The main advantage of a class-D inverter is its high efficiency (almost 100%) at a reasonably low cost.

The main advantage of a class-D inverter is its high efficiency (almost 100%) at a reasonably low cost. Class-D amplifiers are easy to build and set up, which enables the user to produce efficient, high power sine wave inverters quickly without many technical hassles.

The proposed class-D PWM inverter is a small 10 watt test sample prototype. The 10 watt low output is due to the use of low power transistor for T1---T4. The power output can be easily upgraded to 100 watts by replacing the transistors with TIP147/TIP142 complementary pairs.