Electronic device with attachment and switching between batteries therefor
First Claim
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1. An electronic system comprising:
- a host device including host circuitry and at least one host battery; and
an attachment removably engaged with the host device and including an attachment battery, the attachment including at least a first circuit that is always powered by the attachment battery and at least a second circuit that is selectively powered by the host battery or the attachment battery, depending at least in part on a power consumption of at least one designated circuit associated with the attachment, wherein when the power consumption of the designated circuit is above a threshold, the second circuit is powered by the host battery, otherwise the second circuit is powered by the host battery, wherein the determination of which battery powers the second circuit depends at least in part on the inequality Cc >
Hc(A+C/2)/(B+C/2), wherein Cc is the remaining charge capacity of the attachment battery, Hc is the remaining charge capacity of the host battery, A is the current in at least the first circuit, B is the current in at least one circuit that is always powered by the host battery, and C is the current in at least the second circuit.
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Abstract
A host device such as a camera, PDA, etc. can have an attachment such as a wireless modem, with both host and attachment having respective batteries. Some loads in the host are always powered by the host battery, and some loads in the attachment are always powered by the attachment battery, but some other loads in the attachment are selectively powered by either the host or attachment battery depending on a power consumption and/or the relationship between the charges remaining in the batteries.
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Citations
18 Claims
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1. An electronic system comprising:
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a host device including host circuitry and at least one host battery; and an attachment removably engaged with the host device and including an attachment battery, the attachment including at least a first circuit that is always powered by the attachment battery and at least a second circuit that is selectively powered by the host battery or the attachment battery, depending at least in part on a power consumption of at least one designated circuit associated with the attachment, wherein when the power consumption of the designated circuit is above a threshold, the second circuit is powered by the host battery, otherwise the second circuit is powered by the host battery, wherein the determination of which battery powers the second circuit depends at least in part on the inequality Cc >
Hc(A+C/2)/(B+C/2), wherein Cc is the remaining charge capacity of the attachment battery, Hc is the remaining charge capacity of the host battery, A is the current in at least the first circuit, B is the current in at least one circuit that is always powered by the host battery, and C is the current in at least the second circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for powering a host electronic device having an attachment, comprising:
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at least during operation of the host electronic device, always powering at least a host power-only circuit using only a host battery associated with the host electronic device; at least during operation of the attachment, always powering at least an attachment power-only circuit including at least one power amplifier in a CDMA modem in the attachment using only an attachment battery associated with the attachment; and based on at least one criterion, deciding whether to power at least one shared-power circuit associated with the attachment with the host battery or with the attachment battery. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. An electronic system comprising:
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a host device including host circuitry and at least one host battery; and an attachment removably engaged with the host device and including an attachment battery, the attachment including at least a first circuit including at least one power amplifier that is always powered by the attachment battery and at least a second circuit that is selectively powered by the host battery or the attachment battery, depending at least in part at least under some conditions on a relationship between a remaining charge capacity of the attachment battery and a remaining charge capacity of the host battery. - View Dependent Claims (17, 18)
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Specification