Limiting wireless power receiver voltage

摘要

Disclosed are various embodiments for controlling voltage in a wireless power receiver. A wireless power receiver may comprise an electromagnetic coil configured to receive a current induced by a magnetic flux generated by a wireless power transmitter and a comparator configured to compare a voltage generated by the induced current to a threshold voltage indicating a capability of circuitry coupled to the wireless power receiver. In the event the voltage generated by the induced current exceeds the threshold voltage, the voltage may be limited to a safe value.

主权项

1. A portable device comprising:
a wireless receiver configured to provide power to hardware of the portable device, the wireless receiver further configured to: receive a voltage induced by a magnetic flux generated by a wireless power transmitter via an electromagnetic coil in the wireless receiver; compare the received voltage to a threshold voltage; and limit with respective direct shorting paths for both sides of the electromagnetic coil an output voltage provided to the hardware to less than or equal to the threshold voltage in response to the received voltage exceeding the threshold voltage, wherein the direct shorting paths include one or more switches without a discrete impedance element connected in series to the one or more switches so as to immediately reduce the received voltage in response to the received voltage exceeding the threshold voltage.