DC power source determination circuitry for use with an adapter

Details DC power source determination circuitry for use with an adapter DC power source determination circuitry for use with an adapter

2004-01-15

2008-11-18

Sherry, Michael J (Department: 2836)

Electrical transmission or interconnection systems

Miscellaneous systems

Conversion systems

C363S142000

Reexamination Certificate

active

07453171

ABSTRACT:
An adapter device includes a DC/DC adapter to receive DC power from a DC power source, and output a regulated DC voltage (Vout). A source determination circuitry receives the DC power from the DC power source and compares a magnitude of a voltage of the DC power with a reference magnitude of a reference voltage (Vref). When the magnitude of the voltage of the DC power is greater than the reference magnitude, a data signal (Vdata) having a first value is output. When the magnitude of the voltage of the DC power is less than the reference magnitude, the Vdatasignal having a second value is output. The Vdatasignal is received by control circuitry of an electronic device. When the Vdatasignal has the first value, the electronic device operates in a first mode where battery charging circuitry is disabled. When the Vdatasignal has the second value, the battery charging circuitry is enabled.

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