Frequency separation stage design for a reliable data link in an IPT system for electric vehicles

Simultaneous Wireless Power and Data Transfer for Electric Vehicle Charging: A Review

“…Among all the proposals, this approach is one of the most flexible and widely used, considering that it incorporates the advantages of the two previous configurations. On this occasion, as can be seen in [101] [102], [103], [104], [38], [105], [106], [107], [29], [108], [109], [110], [111], [112], [113], [114], [115], [116], [117], [118] and [119], the authors choose to use two different signals, one for data and the other for power, which are transmitted on the same channel but are independently controlled.…”

“…The situation is similar for the data signal, except that, in this case, most authors use frequencies at least one order of magnitude higher than the power signal, in the order of MHz. However, to avoid any potential interferences between the data signal and the power signal harmonics, some authors argue that for the data signal it is more appropriate to use a frequency lower than the power signal [103], [104]. This introduces a disadvantage: the data transmission rate is lower than that achieved with higher frequencies, as can be seen in Table IV, so it would clearly limit a system that requires an exchange of information with a high transmission rate.…”

“…• Half-duplex: where data is transmitted in both directions, but not simultaneously, as is the case in [96], [103], [38] [29], [92], [109], [94], [97], [110], [98], [111], [112] and [113]. (c) Full-duplex Fig.…”

“…Simplex [99], [100], [104], [105], [67], [114], [116], [95], [93], [108] Half-duplex [96], [94], [92], [103], [29], [38], [109], [97], [110], [98], [111], [112], [113] Full-duplex [101], [102], [106], [107], [115], [117], [118], [119] The type of communication used in a circuit can be a determining factor when choosing the protocol on which the data transmission in the system will be based, as it can impose restrictions that may not allow the protocols to be used. This is true of OCPP together with ISO 15118, which, as briefly mentioned in Section III, uses a specific structure in its message sequences.…”

“…The FDM technique is used in most of the designs proposed, such as [102], [38] [109], [101], [103], [104], [105], [106], [107], [29], [108], [109], [111], [112] and [110], [114], [115], [117], [118], [119]. The technique allows two carrier signals to be transmitted simultaneously, with the condition that they must have sufficiently distant frequencies [122].…”