Author/Authors :
ibrahim, oladimeji university of ilorin - department of electrical and electronics engineering, Ilorin, Nigeria , yahaya, nor zaihar b. universiti teknologi petronas - department of electrical and electronics engineering, Perak, Malaysia , saad, nordin universiti teknologi petronas - department of electrical and electronics engineering, Perak, Malaysia , hasan, khairul nisak binti md universiti teknologi petronas - department of electrical and electronics engineering, Perak, Malaysia , shannan, nahla m. alnelain university - department of control engineering, Khartoum, Sudan , zakariyya, olayinka sikiru university of ilorin - department of electrical and electronics engineering, Ilorin, Nigeria , otuoze, abdulrahman okino university of ilorin - department of electrical and electronics engineering, Ilorin, Nigeria
Abstract :
Modelling of switching pulse width modulated phase-shifted full-bridge zero voltage converter is highly challenging due to several transitional stages involved in a complete switching cycle. The circuit averaging technique has been favored in the past three decades considering phase-shifted full-bridge converter as a buck-derived converter. This modelling approach requires several assumptions that include zero equivalent series resistance of output capacitor, zero leakage inductance and unity transformer turn ratio which results in a less accurate system dynamics. In this paper, a system identification approach is proposed for obtaining a more accurate model of phase-shifted full-bridge PWM switching converter using the input-output test data. The model parameter estimation is implemented in Simulink environment incorporating all circuit parasitic parameters and the resulting system’s frequency response shows a good agreement when compared with reported measured response.
Keywords :
System identification , Full , bridge converter , Zero voltage switching , Transfer function , Recursive least square.
