Basic square wave inverter circuit is simple, but the output voltage waveform harmonic content is too large, also both THD (current harmonic distortion) is too large; multi-phase Solar power inverters superposition of harmonic content of a small power inverter output voltage waveform, That THD is small, but the circuit is more complex. The PWM pulse width modulation inverter, both the computer's circuitry, but also allows the output voltage waveform, which has been widely used.
The so-called pulse width modulation PWM (Pulse Width Modulation, PWM), is made of a reference wave (typically a sine wave, the trapezoidal wave or sometimes zero sequence harmonics injected sine wave or square wave, etc.) of the modulation wave (Modulating Wave), and to N times the frequency of the triangular wave modulation wave (sometimes with sawtooth) the carrier (Carrier Wave) waveform comparison, the modulation wave is 1500w off grid inverter greater than the portion of the carrier to produce a set of equal amplitude modulated wave is proportional to the width equivalent to a rectangular pulse sequence modulated wave with a substituted analog switch, and through the inverter power switch on / off control of the DC power into AC power, this technology is called pulse-width control inverter technology. Since the triangular carrier wave (or sawtooth) down degree models are linear change, so this technique is called pulse width control inverter technology. Since the triangular carrier wave (or sawtooth) is a linear variation of the vertical width, so this is also linear modulation, when the modulation wave is a sine wave, a rectangular pulse width of the output pulse sequence changes sinusoidally, the 800w car inverters modulation technique is often also known as the sinusoidal pulse width modulation (Sinusoida PWM) technology.
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