Cascading power for accessories
First Claim
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1. An accessory comprising:
- a power module; and
an ID module including a controller that is coupled to the power module, the accessory configured to;
send ID information to an upstream charging source in response to receiving a first limited current from the charging source, wherein the ID information comprises information that identifies the accessory;
receive a charging current greater than the first limited current from the charging source in response to sending the ID information; and
command the power module to supply a second limited current to a downstream device in response to receiving the charging current from the charging source.
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Abstract
Methods, systems, and apparatuses for charging a host device from a charging source through an accessory are described. Upon detecting an input power signal from the charging source, an accessory may send an identification request to the host device and authenticate the host device based on the identification information received from the host device. Upon authenticating the host device, the accessory may enable a power path between the charging source and the host device to supply a charging current to charge the host device.
20 Citations
20 Claims
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1. An accessory comprising:
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a power module; and an ID module including a controller that is coupled to the power module, the accessory configured to; send ID information to an upstream charging source in response to receiving a first limited current from the charging source, wherein the ID information comprises information that identifies the accessory; receive a charging current greater than the first limited current from the charging source in response to sending the ID information; and command the power module to supply a second limited current to a downstream device in response to receiving the charging current from the charging source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An accessory comprising:
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a power module; and an ID module including a controller that is coupled to the power module, the accessory configured to; send ID information to an upstream charging source in response to receiving an ID request from the charging source, wherein the ID information comprises information that identifies the accessory and a charge current indicator; receive a charging current based on the charge current indicator from the charging source in response to sending the ID information; and command the power module to supply a limited current to a downstream device in response to receiving the charging current from the charging source. - View Dependent Claims (11, 12, 13, 14)
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15. A method comprising:
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receiving, by an ID module of an accessory, a limited current from an upstream charging source; sending, by the ID module, ID information to the charging source, wherein the ID information comprises information that identifies the accessory; receiving, by the ID module, a charging current that is greater than the limited current in response to sending the ID information to the charging source; sending, by the ID module, a command to a power module to supply a second limited current to a downstream device in response to receiving the charging current from the charging source. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification