Solar Power Inverters and EMI Filtering
This technique converts the DC voltage into a high-frequency sinusoidal waveform, filtered and amplified to produce the desired AC
Pulse-width modulation to approximate the true sine wave by high frequency inverter. In the image above, the blue line shows the square wave varied by the length of the pulse and timing between pulses; the red curve shows how those alternating signals are modeled by a sine wave.
Pulse Width Modulation (PWM) Inverter: uses digital signals to generate an AC output by switching the DC voltage on and off at a high frequency. Advantages: High power quality, high efficiency, and low harmonic distortion. Disadvantages: Complex design, the higher cost compared to other types.
In the inverter, a low-power reference 60 Hz sine wave and a higher-frequency triangular wave are used to produce the PWM waveform. The sine wave amplitude values are sampled by the triangular wave to produce the PWM waveform.
Output Filter: Smooths the AC waveform and reduces harmonic content. Control Circuit: Regulates the output voltage and frequency and monitors the inverter for protection events. The DC-AC Converter in a pure sine wave inverter typically uses the carrier-based pulse width modulation (PWM) technique.
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