Management of common mode noise frequencies in portable electronic devices

摘要

The disclosed embodiments provide a system that facilitates the use of a portable electronic device. During operation, the system detects a coupling of a power supply to the portable electronic device through a set of wires. Next, the system uses the set of wires to identify a type of the power supply. The system then periodically determines a switching frequency of the power supply based on the type of the power supply and a current drawn from the power supply. Finally, the system uses the switching frequency to facilitate the operation of a touch control in the portable electronic device. For example, if the switching frequency corresponds to a sensing frequency of the touch control, the system may change the sensing frequency to an alternative sensing frequency.

主权项

1. A computer-implemented method for facilitating the use of a portable electronic device, comprising:
establishing a communications link between a power supply and the portable electronic device; using the communications link to identify a type of the power supply; periodically determining a switching frequency of the power supply based on the type of the power supply and a current drawn from the power supply; and using the switching frequency to facilitate the operation of a touch control in the portable electronic device, wherein using the switching frequency to facilitate the operation of a touch control in the portable electronic device comprises managing the switching frequency of the power supply based on one or more sensing frequencies to reduce common mode noise associated with sensing touch input on the portable electronic device.