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Power supply management method for palm equipment

A handheld device, power management technology, applied in the direction of data processing power supply, measuring device, measuring flow/mass flow, etc.

Inactive Publication Date: 2003-12-24
宏电脑上海
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a power management method for handheld devices to solve the problem of how to simultaneously use dry batteries as emergency power in handheld devices powered by rechargeable batteries

Method used

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  • Power supply management method for palm equipment
  • Power supply management method for palm equipment
  • Power supply management method for palm equipment

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Embodiment Construction

[0017] This part provides an example of adopting the technical solution of the present invention, allowing rechargeable batteries and dry batteries to use the same set of power management solutions, so that both rechargeable batteries and dry batteries can give a normal operating voltage of V 1 = 3.3 volts for handheld devices. The rechargeable battery is a lithium battery that has a voltage of 4.1 volts when fully charged. The dry batteries are two brand new AAA batteries, which can provide 3 volts. Preset voltage threshold V 0 = 2.8 volts.

[0018] like figure 2 As shown, in the handheld device, the lithium battery and the dry battery are connected to the power management chip through a switch, and the switch is to preferentially use the lithium battery for power supply. The power management chip adopts an IC chip capable of both DC-DC step-up and DC-DC step-down. This chip is available in the market, such as products produced by TI. A power detection circuit detects t...

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PUM

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Abstract

A power supply management method for palm device using either rechangeable battery or dry battery for emergency purpose includes setting up a critical voltage Vo which is lower than normal working voltage, measuring the voltage VI of rechargeable battery, comparing V1 with V0, cutting off the rechargeble battery if V1 is lower than V0, measuring the voltage V of dry battery, comparing V with V0, and switching from rechargeable battery to dry battery if V is greater than or equal to V0, or automatically shutdown if V is less than v0.

Description

Technical field: [0001] The invention belongs to the technical field of power supply control and management, and in particular relates to a power supply management method of a handheld device powered by a rechargeable battery. Background technique: [0002] At present, most handheld devices use a single rechargeable battery power supply system, such as handheld computers powered by lithium batteries, business communication and so on. The handheld device using this single power supply mode often encounters the problem of insufficient voltage and cannot use the power adapter to switch to the AC power supply during use. This is especially the case when using outdoors. If dry batteries can be used as an emergency power supply at this time, it will bring great convenience to users. Invention content: [0003] The purpose of the present invention is to provide a power management method for handheld devices to solve the problem of how to simultaneously use dry batteries as emer...

Claims

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Application Information

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IPC IPC(8): G06F1/26
Inventor 戴丰吕童群
Owner 宏电脑上海