Load current waveform in a full-bridge inverter In a single-phase full-bridge inverter, the shape of the load current primarily depends on which factor?

Introduction / Context:
Inverters synthesize AC from DC by switching. The voltage output is decided by the switching pattern, but the current waveform is shaped by the load impedance seen by that voltage. Understanding this is fundamental for harmonic performance and filter design.

Given Data / Assumptions:

• Full-bridge inverter producing a square or PWM voltage.
• Load may contain resistance (R), inductance (L), and capacitance (C).

Concept / Approach:
By Ohm’s and impedance laws, the current spectrum equals the applied voltage spectrum multiplied by the load transfer function 1/Z(jω). Therefore, the time-domain current waveform depends on the combined RLC impedance over the switching and fundamental frequencies.

Step-by-Step Solution:
Square/PWM voltage contains harmonics at multiples of the switching and fundamental frequencies.Compute Z(jω) for each harmonic given R, L, C.Current harmonics I_n = V_n / Z(jnω) → waveform follows RLC characteristics.

Verification / Alternative check:
SPICE simulations with different R, L, C values show notable changes in current shape even with identical gating patterns.

Why Other Options Are Wrong:
R–L or L–C only: Incomplete; R also affects damping and amplitude.
Gating frequency only: Affects voltage spectrum but current depends on load impedance too.

Common Pitfalls:
Assuming current mirrors the voltage; in reactive loads, current leads or lags and can be smoothed significantly.

Final Answer:
relative values of load parameters R, L and C