3 Sin the circuit 0, the switch ariation of the oblem Q4 problem 15 2 The output voltage waveform of a DC-AC converter is shown in Figure 04 (a) By inspection of the waveform what can you say with justification about the harmonic content (.e. the Fourier series expansion) of this voltage (5 marks) (b) Show that the Fourier Series expansion of this wavform is given by 400 sin(2n-1)o (21-1) (10 marks) (c) Write down the fundamental and the third harmonic in the form V-V since, and sketch a fully labelled single-sided amplitude line spectra of this voltage waveform showing the first 4 Fourier components (5 marks) 6 & 7 Y H vt) B А 2 4 2 -1 Figure Q4 Total Q4 (20 marks)