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In order to analyse the harmonic content of the output voltages we can start with the one of the potentials P_j of each of the arms.

Single-phase inverter application

• Determine the development in Fourier series of the potential P_j of the 1st arm considering as a time origin the passage of P₁ from -U/2 to +U/2.

• Deduct the development in Fourier series of the potentials P₁ and P₂ and of the voltage u¢.

Tri-phased inverter application

As in the case of the single-phase inverter, we can start from the development in Fourier series of the arm's potentials.

• Determine the development in Fourier series of the potentials P_A, P_B, P_C considering as a time origin the passage of P_A from -U/2 to +U/2.

• Deduct the development in Fourier series of the potentials P_A, P_B, P_C, and of u¢_A if the load is tri phased, star-balanced, with insulated null.

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