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Power supply management system for palm equipment

A power management system, a technology for handheld devices, used in data processing power supplies, measuring devices, measuring flow/mass flow, etc.

Inactive Publication Date: 2005-05-25
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 system for handheld devices to solve the problem of how to use dry batteries as emergency power in handheld devices powered by rechargeable batteries

Method used

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  • Power supply management system for palm equipment
  • Power supply management system for palm equipment
  • Power supply management system for palm equipment

Examples

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Embodiment Construction

[0017] This section provides an example of adopting the present invention, allowing rechargeable batteries and dry batteries to use the same set of power management system, 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] 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 detects the voltage of lithium b...

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PUM

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Abstract

The invention provides a power management system for handheld devices. The handheld device is powered by a rechargeable battery, and also includes: a dry battery used as an emergency power supply; a switch for switching between the rechargeable battery and the dry battery to select one of the two to supply power to the handheld device ; a power detection circuit for detecting the voltage of the lithium battery and dry battery; a controller for controlling the switching switch according to the detection result of the power detection circuit. With the power management system 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, in particular to a power management system 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 system for handheld devices to solve the problem of how to simultaneously use dry batteries as emergency power in hand...

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