POWER SUPPLY SYSTEM AND ELECTRONIC EQUIPMENT

Title:

POWER SUPPLY SYSTEM AND ELECTRONIC EQUIPMENT

Document Type and Number:

Japanese Patent JP2007306647

Kind Code:

A

Abstract:

To provide a power supply system capable of reducing the number of switching elements.

In this power supply system, an AC/DC adaptor 121 supplies power to a load 125 and a charger 122. The charger includes a high side FET 102 and a low side FET 103 both operating on a synchronous rectification method and charges batteries 108, 109. When a commercial power supply fails, a power failure detecting circuit provided to the charger detects the power failure and outputs a power failure signal. The charger receiving the power failure signal sets the high side FET to on-keep, allowing the current discharged from the battery to flow through a discharge channel 119, with a reduction in the number of FET as compared with other power supply systems.

Inventors:

ODAOHARA SHIGEFUMI

Application Number:

JP2006129864A

Publication Date:

November 22, 2007

Filing Date:

May 09, 2006

Export Citation:

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Assignee:

LENOVO SINGAPORE PTE LTD

International Classes:

H02J7/00; H01M10/44; H02J7/34; H02J9/06; H02M3/155

Attorney, Agent or Firm:

Hiromichi Watanabe
Kazuo Moriya

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