The Influence of Commercial PC Switched Mode Power Supply Interference on the PRIME PLC Performance

Influence of Chaotic spreading factor modulation based Random Modulation on G3-PLC system

“…It can be noticed that the multiplication of two sinusoidal signals depicted what seems to be a level-shifted sinusoidal signal with some deviations. Figure 4b shows the emissions associated with those techniques and it can be seen that the multiplication of two Sinusoidal signals caused a shifting in the emissions to the edge of 63 kHz instead of being concentric around it as in [10]. Figure 5a shows the product of two signals while the Sawtooth signal is the primary signal and figure 5b shows the emissions of this modulation.…”

“…The Random Carrier Frequency Modulation with Fixed Duty Cycle (RCFMFD) approach is considered in this paper as it's popular and simple [10]. The spread spectrum switching signal of the randomized carrier frequency is presented in equation ( 1).…”

“…One of the main advantages of PLC is that it does not require extra installation costs as it uses the existing electrical network to transfer the data [6]. However, PLC systems suffer from the noises conducted by the surrounding electrical equipment [8][9][10].…”

“…Also, the civilian electromagnetic compatibility standards cover the converters operating after 150 kHz [8]. Operating at similar frequency ranges makes the power converters conducted/emitted electromagnetic interference (EMI) adversely affect the PLC system and cause lot of losses in the received data, service misreading, and interruption of service [10]. Therefore, it is important to mitigate the emissions of power converters [11].…”

“…Thus, random modulation is used in many applications such as machine torque ripples reduction and lowering the acoustic noise [14]. A lot of researches investigated various ways to apply random modulation such as randomizing the switching frequency, randomizing the pulse position, and randomizing the pulse width [10][11][12][13][14].…”