PART 1: Primary Interface Definition ............................................ 21
2 Mechanical interface ...................................................................................... 22
2.1 Power Receiver design requirements (PRx) ............................................................................................ 22
2.1.1 Interface Surface ............................................................................................................................. 22
2.1.2 Alignment Aid .................................................................................................................................. 22
2.2 Power Transmitter design requirements (PTx) ....................................................................................... 23
3 Power interface .............................................................................................. 24
3.1 Power Receiver design requirements (PRx) ............................................................................................ 24
3.1.1 Dual resonant circuit ....................................................................................................................... 27
3.1.2 Rectification circuit .......................................................................................................................... 29
3.1.3 Sensing circuits ................................................................................................................................ 29
3.1.4 Communications modulator ............................................................................................................ 29
3.1.5 Communications demodulator ........................................................................................................ 29
3.1.6 Output disconnect ........................................................................................................................... 29
3.1.7 Meaningful functionality ................................................................................................................. 30
3.1.8 Shielding .......................................................................................................................................... 30
3.1.9 Power consumption ........................................................................................................................ 30
3.2 Power Transmitter design requirements (PTx) ....................................................................................... 31
3.2.1 Load step and load dump (informative) .......................................................................................... 31
3.2.2 Load step test procedure................................................................................................................. 31
3.2.3 Load dump test procedure .............................................................................................................. 33
3.2.4 Power Receiver over-voltage protection ......................................................................................... 36
4 Thermal interface ........................................................................................... 43
4.1 Interface Surface temperature rise......................................................................................................... 43
5 Information interface ...................................................................................... 44
5.1 System Control ........................................................................................................................................ 44
5.1.1 Overview (informative) ................................................................................................................... 44
5.1.2 Power Transmitter (PTx) perspective .............................................................................................. 49
5.1.3 Power Receiver (PRx) perspective ................................................................................................... 70
5.1.4 State diagram (informative) ............................................................................................................ 85
5.2 Power Receiver to Power Transmitter communications interface ......................................................... 86
5.2.1 Introduction ..................................................................................................................................... 86
5.2.2 Physical and data link layers (PRx to PTx) ........................................................................................ 86
5.2.3 Logical layer (PRx to PTx) ................................................................................................................. 91
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