Abstract
This study presents methodology to generate sinusoidal pulse width modulation (SPWM) signal using Field Programmable Gate Array, FPGA technology. We discussed the unipolar switching scheme and the methodology to generate the signal with the predetermined switching frequencies. Simulation on the designed pulses was conducted using Altera Max Plus II simulation tools. This simulation method was used to get the desired sinusoidal pulse width modulated signal via programming. Designing the best switching frequency for inverter was important in order to get the best approximation of the sinusoidal signal as produced by an ideal inverter. The smoother inverter switching signal, the better output waveform from the inverter and thus produced output signal with less harmonics distortion. Simulation was done before being tested on the FPGA board for the next stage.
Highlights
Pulse width modulation (PWM) is widely used in power electronics to digitize the power so that a sequence of alternating voltage pulses can be generated by the on and off of the inverter power transistors
This study presents the use of Field programmable gate array (FPGA) technology to design and implement the switching signals for channel 1 and channel 2 to produce the desired output signal from the bridge inverter
The result shows that the switching pulses generated with only two percent difference from the predetermined switching frequency
Summary
Pulse width modulation (PWM) is widely used in power electronics to digitize the power so that a sequence of alternating voltage pulses can be generated by the on and off of the inverter power transistors. Switching time Switching frequency Dead time Number of pulses μs 2.0 kHz 500 μs 38 Designing switching pulses with high changes flexibility is the challenge in order to get the best approximation of the sinusoidal signal.
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