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Power supply management method for palm equipment

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

Inactive Publication Date: 2005-05-04
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

[0018] 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.

[0019] Such as 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 detect...

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PUM

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Abstract

The invention provides a power management method for handheld devices. The handheld device is powered by a rechargeable battery, and also uses a dry battery as an emergency power supply, and manages the power supply as follows: set a voltage threshold V 0 , the critical value is lower than the normal operating voltage of the handheld device V 1 ; First select a rechargeable battery for power supply, and detect its voltage V, and compare V with V 0 , if V≥V 0 Then continue to use rechargeable battery power supply, if V<V 0 Then cut off the power supply of the rechargeable battery; further detect the voltage V' of the dry battery, and compare V' with V 0 , if V′≥V 0 Use dry batteries to supply power to handheld devices, if V′<V 0 Then the handheld device will automatically shut down. By adopting the power management method of the present invention, the rechargeable battery and the dry battery can be used on the handheld device at the same time, and when the voltage of the rechargeable battery is insufficient, the dry battery can be used as an emergency power supply.

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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Patent Type & Authority Patents(China)
IPC IPC(8): G06F1/26
Inventor 戴丰吕童群
Owner 宏电脑上海