摘要:
A transmitter device (202) for an inductive energy transfer system can include a DC-to-AC converter (502) operably connected to a transmitter coil (504), a first capacitor (C P1 ) connected between the transmitter coil (504) and one output terminal (506) of the DC-to-AC converter (502), and a second capacitor (C P2 ) connected between the transmitter coil (504) and another output terminal (508) of the DC-to-AC converter (502). One or more capacitive shields can be positioned between the transmitter coil (504) and an interface surface (214) of the transmitter device (202). A receiver device (204) can include a touch sensing device (516), an AC-to-DC converter (512) operably connected to a receiver coil (510), a first capacitor (C S1 ) connected between the receiver coil (510) and one output terminal of the AC-to-DC converter (512), and a second capacitor (C S2 ) connected between the receiver coil (510) and another output terminal of the AC-to-DC converter (512). One or more capacitive shields can be positioned between the receiver coil (510) and an interface surface (212) of the receiver device (204).
摘要:
A transmitter device (202) for an inductive energy transfer system can include a DC-to-AC converter (502) operably connected to a transmitter coil (504), a first capacitor (C P1 ) connected between the transmitter coil (504) and one output terminal (506) of the DC-to-AC converter (502), and a second capacitor (C P2 ) connected between the transmitter coil (504) and another output terminal (508) of the DC-to-AC converter (502). One or more capacitive shields can be positioned between the transmitter coil (504) and an interface surface (214) of the transmitter device (202). A receiver device (204) can include a touch sensing device (516), an AC-to-DC converter (512) operably connected to a receiver coil (510), a first capacitor (C S1 ) connected between the receiver coil (510) and one output terminal of the AC-to-DC converter (512), and a second capacitor (C S2 ) connected between the receiver coil (510) and another output terminal of the AC-to-DC converter (512). One or more capacitive shields can be positioned between the receiver coil (510) and an interface surface (212) of the receiver device (204).
摘要:
A transmitter device (202) for an inductive energy transfer system can include a DC-to-AC converter (502) operably connected to a transmitter coil (504), a first capacitor (C P1 ) connected between the transmitter coil (504) and one output terminal (506) of the DC-to-AC converter (502), and a second capacitor (C P2 ) connected between the transmitter coil (504) and another output terminal (508) of the DC-to-AC converter (502). One or more capacitive shields can be positioned between the transmitter coil (504) and an interface surface (214) of the transmitter device (202). A receiver device (204) can include a touch sensing device (516), an AC-to-DC converter (512) operably connected to a receiver coil (510), a first capacitor (C S1 ) connected between the receiver coil (510) and one output terminal of the AC-to-DC converter (512), and a second capacitor (C S2 ) connected between the receiver coil (510) and another output terminal of the AC-to-DC converter (512). One or more capacitive shields can be positioned between the receiver coil (510) and an interface surface (212) of the receiver device (204).
摘要:
Methods for operating a portable electronic device to conduct a mobile payment transaction at a merchant terminal are provided. The electronic device may verify that the current user of the device is indeed the authorized owner by requiring the current user to enter a passcode. If the user is able to provide the correct passcode, the device is only partly ready to conduct a mobile payment. In order for the user to fully activate the payment function, the user may have to supply a predetermined payment activation input such as a double button press that notifies the device that the user intends to perform a financial transaction in the immediate future. The device may subsequently activate a payment applet for a predetermined period of time during which the user may hold the device within a field of the merchant terminal to complete a near field communications based mobile payment transaction.
摘要:
A host electronic device may be coupled to an accessory electronic device. During normal operation, the host device may supply the accessory device with power over a power supply line. Back-powering events in which the accessory device delivers power to the host device may be prevented by interposing a protection transistor in the power supply line. A current mirror may be formed using the protection transistor and an additional transistor that produces a sense current proportional to the amount of current that is flowing through the power supply line. A current-to-voltage amplifier may produce a sense voltage that is proportional to the sense current. A bias circuit may be used to bias the sense current through the current mirror. A control circuit may compare the sense voltage to one or more reference voltages and turn off the protection transistor when appropriate to prevent back-powering of the host device.