Load identification in dynamic wireless power transfer system utilizing current injection in the transmitting coil

Abstract

In this paper, a load identification approach for dynamic wireless power transfer for electric vehicles is introduced. In the proposed method, determination of the load parameters and position are achieved without requiring any communication link between the transmitter and receiver or using any extra coil. The load detection procedure is achievable using two modes: the energy injection mode and the free resonant mode. The operating principles and theoretical analysis of this method are presented in this paper, together with experimental results.

Estimation of the Transferred Power in LCC Compensated Wireless Power Transmitters With the Use of PWM-Synchronized Sampling Technique

“…Therefore, it drastically influences the LCC network and causes it not to operate according to its ideal operational goal of the current source. Hence, the input apparent power in and the LCC parallel capacitor voltage in are changed to (19) and (20) respectively.…”

“…It is clear from (19) and (20), the lack of tuning in the frontend loop of the LCC network (i.e., Δ S ≠ 0) causes the other detuned parameters (Δ T and Δ R ) to influence the power estimation in a non-linear way. Therefore, amongst Δ S , Δ T , and Δ R , proper tuning of Δ S is crucially important to achieve an acceptable result from the proposed technique of transferred power estimation.…”

“…1(c). Identification in the reflective direct techniques can be carried out by observing the amplitude of the influenced (reflected) signal [16], [17] or its frequency content [18]- [20]. In reflective measurement techniques, the presence of the receiver which is effectively coupled with the transmitter influences the characteristic of the system which can also be observed through the transmitter pads.…”

“…In the first approach of the interrupted cycles of sensing, the WPT process is to be halted for a short period of time to identify the receiver parameters. In this direct approach, although the same WPT transmitter is used to sense the receiver, sensing interruptions can decrease the overall transferred power and it can create some undesirable transients in the transmitter-side [18]- [20]. Therefore, continuous techniques are proposed to observe the receiver through the same WPT transmitter with a minimum influence on the WPT process [16], [17].…”

Expandable N-Legged Converter to Drive Closely Spaced Multitransmitter Wireless Power Transfer Systems for Dynamic Charging

“…1, the pickup position must be sensed and sent to the driving system. So far, studies have shown some promising results in the realm of pickup position estimation by directly measuring WPT coil-compensator current and voltages [24][25][26][27], or with the use of additional sensing systems [28,29], and yet some more accurate and fast techniques are being investigated. Position estimation is important particularly in EVs to make them smarter, especially for auto piloting.…”