Question

Let Im be the maximum load current and Vm be the minimum supply voltage value. Than the expression for the design of commutation circuit parameters in a single-phase modified McMurray half-bridge inverter is given by

(a) (1.5 x Im)/Vm

(b) Im/(1.5 x Vm)

(c) Vm/(1.5 x Im)

(d) (1.5 x Vm)/Im

I have been asked this question in a national level competition.

My doubt stems from Force-Commutated Inverters in division Inverters of Power Electronics

Answer 1

Right option is (c) Vm/(1.5 x Im)

For explanation I would say: The design is carried out on the basis of the worst operating conditions which consist of the minimum supply voltage Vm and the maximum load current. (c) gives the empirical formula for calculation of the L and C commutation circuit parameters.