dSPACE-based dual randomized pulse width modulation for acoustic noise mitigation in induction motor

Analysis of output voltage ripple for dual randomized PWM buck converter operating in continuous and discontinuous conduction modes

“…Note that the simple schemes (RCFM and RPPM) are directly deduced as particular cases from the general model. The proposed analytical model is validated by a comparison to simulation results under MatLab-Simulink using the Welch estimation of the PSD, which gives satisfactory results [8,10,11]. A comparison between PSDs of the input current for the three schemes in both the CCM and the DCM is presented.…”

“…This will cause a high EMI and will affect nearby electronic devices [3]. The switching signal q is approximated with a square wave and the input current i in can be approximated with a triangular wave in CCM and DCM, as shown in Figure 3, [3,8].…”

“…However, the RPWM technique is one of the most efficient and cost-effective solutions: it allows spreading the power spectrum of input current and output voltage over a wide frequency range while significantly reducing its amplitude, which is a significant EMC benefit, requiring no additional hardware [3]. Several papers regarding this new technique have been published, principally, two simple RPWM schemes with a single randomized parameter are proposed; the scheme in which the switching period is randomized (Randomized Carrier Frequency Modulation: RCFM) and the scheme in which the period is kept constant and the pulse position is randomized (Randomized Pulse Position Modulation: RPPM), for both the DC-DC [3][4][5][6][7][8][9][10] and the DC-AC [8][9][10][11]. For a maximum spreading of the voltage spectrum, a combination of the two simple schemes (RCFM and RPPM) that we call (RCFM-RPPM) or the DRPWM scheme has also been proposed [8][9][10][11].…”

“…Several papers regarding this new technique have been published, principally, two simple RPWM schemes with a single randomized parameter are proposed; the scheme in which the switching period is randomized (Randomized Carrier Frequency Modulation: RCFM) and the scheme in which the period is kept constant and the pulse position is randomized (Randomized Pulse Position Modulation: RPPM), for both the DC-DC [3][4][5][6][7][8][9][10] and the DC-AC [8][9][10][11]. For a maximum spreading of the voltage spectrum, a combination of the two simple schemes (RCFM and RPPM) that we call (RCFM-RPPM) or the DRPWM scheme has also been proposed [8][9][10][11]. It has been reported, in [8], that this combined scheme gives the most spread spectrum of the input current in DC-DC converters operating in DCM.…”

“…For a maximum spreading of the voltage spectrum, a combination of the two simple schemes (RCFM and RPPM) that we call (RCFM-RPPM) or the DRPWM scheme has also been proposed [8][9][10][11]. It has been reported, in [8], that this combined scheme gives the most spread spectrum of the input current in DC-DC converters operating in DCM. However, this effect has not yet been addressed in CCM.…”