This paper presents performance evaluation of varying triggering angles on single-phase semi bridge controlled AC-DC Converter, which are, dependent on the deferment angles. This article is meant for adequately identifying the better range of deferment or delay angles for controlled rectification for optimal performance of the single-phase half wave AC–to-DC converter. The single-phase half wave controlled rectifier is formed by combination of thyristor power switch, power cables and triggering circuit in the presence of supply voltage and the load/s. This article is also used to find out the levels of total harmonic distortions, amplitudes and the nature of the output voltage of single-phase half bridge controlled rectifier at varying firing angles. It also presented the clear convenient range of firing angles to be used for AC-DC rectified based appliances that have not been shown in other work done online in this perspective. The overall system is modeled and simulated in MatLab 2018. The outcomes of the investigations are that: (i) the best operating ranges of triggering actions occurred after delay angles of 15unmapped: inline-formula unmapped: math unmapped: msup unmapped: mrow unmapped: mrow unmapped: mo ∘ and 30unmapped: inline-formula unmapped: math unmapped: msup unmapped: mrow unmapped: mrow unmapped: mo ∘, (ii) the output voltage or current of the rectifier after delay angles of 15unmapped: inline-formula unmapped: math unmapped: msup unmapped: mrow unmapped: mrow unmapped: mo ∘ and 30unmapped: inline-formula unmapped: math unmapped: msup unmapped: mrow unmapped: mrow unmapped: mo ∘ needs small size of filter components, (iii) the proposed system has low harmonic distortions after delay angles of 15unmapped: inline-formula unmapped: math unmapped: msup unmapped: mrow unmapped: mrow unmapped: mo ∘ and 30unmapped: inline-formula unmapped: math unmapped: msup unmapped: mrow unmapped: mrow unmapped: mo ∘ (iv) at delay angle of 180unmapped: inline-formula unmapped: math unmapped: msup unmapped: mrow unmapped: mrow unmapped: mo ∘, the output of the system turned in complete AC waveform that are detrimental to connecting it directly to DC loads, hence complete avoidance of operating after delay angle of 180unmapped: inline-formula unmapped: math unmapped: msup unmapped: mrow unmapped: mrow unmapped: mo ∘.