公开(公告)号：US20190334366A1

公开(公告)日：2019-10-31

申请号：US15964793

申请日：2018-04-27

Applicant: STMicroelectronics Design and Application S.R.O.

Inventor： Karel BLAHA ,  Martin DRINOVSKY

IPC: H02J7/02 ,  H02J50/05 ,  H02J50/80

Abstract: An analog ping signal that is present at a secondary coil of a power receiving device operating within a wireless power transmission system is detected. The detection circuit includes a DC blocking circuit having an input directly connected to a terminal of the secondary coil. A comparator circuit has an input coupled to an output of the DC blocking circuit. A timer circuit is reset by a signal output by the comparator circuit to assert a ping detect signal in response to a resetting of the timer circuit. The ping detect signal is deasserted in response to a timing out of the timer circuit.