CASCADING POWER FOR ACCESSORIES
First Claim
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1. An accessory comprising:
- a power module; and
an identification (ID) module coupled to the power module, wherein the ID module is configured to;
send an ID request to a downstream device coupled to the accessory in response to detecting an input power signal from an upstream device coupled to the accessory;
receive ID information from the downstream device;
authenticate the downstream device based on the ID information; and
send a signal to the power module to enable a power path between the upstream device and the downstream device to supply a charging current to the downstream device.
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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.
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Citations
22 Claims
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1. An accessory comprising:
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a power module; and an identification (ID) module coupled to the power module, wherein the ID module is configured to; send an ID request to a downstream device coupled to the accessory in response to detecting an input power signal from an upstream device coupled to the accessory; receive ID information from the downstream device; authenticate the downstream device based on the ID information; and send a signal to the power module to enable a power path between the upstream device and the downstream device to supply a charging current to the downstream device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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receiving, by an accessory, an input power signal from an upstream device; sending, by the accessory, an identification (ID) request to a downstream device; receiving, by the accessory, an ID response from the downstream device, wherein the ID response includes a charge current indicator; authenticating, by the accessory, the downstream device based on the ID response; and enabling, by the accessory, a power path between the upstream device and the downstream device to provide a charging current to the downstream device, wherein the charging current provided to the downstream device is based on the charge current indicator. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method comprising:
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receiving, by an accessory, an input power signal from an upstream device; sending, by the accessory, a first identification (ID) request to a first downstream device; receiving, by the accessory, a first ID response from the first downstream device, wherein the first ID response includes a first charge current indicator; authenticating, by the accessory, the first downstream device based on the first ID response; sending, by the accessory, a second ID request to a second downstream device; receiving, by the accessory, a second ID response from the second downstream device, wherein the second ID response includes a second charge current indicator; authenticating, by the accessory, the second downstream device based on the second ID response; and distributing, by the accessory, a current from the upstream device to the first and second downstream devices based on the first and second charge current indicators. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification