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公开(公告)号：US20230171529A1
公开(公告)日：2023-06-01
申请号：US17537263
申请日：2021-11-29
Inventor： Tomas TEPLY , Karel BLAHA
CPC classification number: H04R1/1025 , H04R9/04 , H04R9/06 , H04R1/1075 , H04R2420/07
Abstract: The present disclosure is directed to a device that includes a headphone speaker housing that includes a coil having a first terminal and a second terminal that is configured to operate in a sound generation mode and a battery charging mode. A class D amplifier circuit is configured to rectify in a battery charging mode and amplify in a sound generation mode, the class D amplifier is coupled to the first terminal and the second terminal of the coil. The class D amplifier including a first, second, third, and fourth switch, the first terminal coupled between the first and second switch, the second terminal coupled between the third and fourth switch. An audio generation circuit having a third terminal and a fourth terminal, the third terminal coupled between the first and third switch of the class D amplifier and the fourth terminal coupled between the second and fourth switch of the class D amplifier. A battery charging circuit coupled to the third terminal and the fourth terminal.
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公开(公告)号：US20190334366A1
公开(公告)日：2019-10-31
申请号：US15964793
申请日：2018-04-27
Inventor： Karel BLAHA , Martin DRINOVSKY
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.
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