Power supply control circuit, electronic apparatus and charging method thereof

A technology for power control circuits and electronic instruments, applied in battery circuit devices, secondary battery charging/discharging, instruments, etc.

Inactive Publication Date: 2003-03-12
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Therefore, it is impossible to set the same electroni

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  • Power supply control circuit, electronic apparatus and charging method thereof
  • Power supply control circuit, electronic apparatus and charging method thereof
  • Power supply control circuit, electronic apparatus and charging method thereof

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Embodiment Construction

[0054] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0055] The embodiments described below are not limited only to the contents of the present invention described in the claims, and all the configurations described in the embodiments are not limited only to the elements necessary for the configuration of the present invention.

[0056] One embodiment of the present invention relates to a power control circuit for an electronic instrument with a USB interface, wherein when the electronic instrument is set on the slave side of USB data transmission and is in normal operation mode, the power control circuit switches the power of the USB power cord to A power supply for a rechargeable battery, or an external power supply for a data transmission control circuit for controlling USB data transmission; and when an electronic instrument is set on the slave side of USB data transmission and in charging mode, in order to recharge...

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Abstract

When an electronic instrument Q is in normal operating mode and set to be slave, power from a rechargeable battery or an external power source is supplied to a data transfer control circuit, and when the electronic instrument Q is in charge mode and set to be slave, power from VBUS is supplied thereto to charge a rechargeable battery. When an external power source can be used in charge mode, power from the external power source is supplied to the rechargeable battery instead of from VBUS. When an electronic instrument P is in normal operating mode and set to be master, power from a rechargeable battery or an external power source is supplied to the data transfer control circuit and the electronic instrument Q; and when the electronic instrument P is in charge mode and set to be master, power from the rechargeable battery or the external power source is supplied to the electronic instrument Q through the VBUS in order to charge a rechargeable battery of the electronic instrument Q. In charge mode, the supply of power to the data transfer control circuit is either turned off or an energy-saving mode is set.

Description

technical field [0001] The present invention relates to a power control circuit, an electronic instrument and a charging method thereof. technical background [0002] In portable electronic instruments such as mobile phones, it is very common to use battery power. Its rechargeable battery (rechargeable battery, or secondary battery) must be charged using a dedicated AC adapter or charger. Moreover, such an AC adapter or charger cannot be applied to other types of portable electronic instruments (products of other companies or self-produced products) in many cases. Therefore, when going out with a variety of portable electronic instruments, it is necessary to carry a plurality of AC adapters or chargers, which is very inconvenient for the user. [0003] On the other hand, in recent years, a universal serial bus (USB), which is an interface standard for connecting a personal computer (hereinafter referred to as a PC) with its external devices, has been rapidly introduced int...

Claims

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Application Information

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IPC IPC(8): G06F1/26G06F1/32G06F3/00H01M10/44H02J7/00
CPCY02E60/12G06F1/3237Y02B60/1221H02J7/0054G06F1/263H02J2007/006G06F1/3203H02J7/0055G06F1/324Y02B60/1292G06F1/266Y02B60/1217H02J2207/30H02J2207/40H02J7/342Y02D10/00
Inventor 松田邦昭大下俊
Owner SEIKO EPSON CORP
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