POWER SOURCE SWITCHING UNIT WITH INTEGRATED CHARGING CIRCUIT...

Details POWER SOURCE SWITCHING UNIT WITH INTEGRATED CHARGING CIRCUIT... POWER SOURCE SWITCHING UNIT WITH INTEGRATED CHARGING CIRCUIT...

2005-07-19

2005-07-19

Vo, Tim (Department: 2111)

Electrical computers and digital processing systems: support

Computer power control

Having power source monitoring

C713S300000, C713S324000

Reexamination Certificate

active

06920575

ABSTRACT:
To obtain a power source switching unit that is capable of cost and size reduction, and also supplying electric power reliably even when external power supply is intercepted, and to obtain a computer that is capable of avoiding shutdown that results from the interception of the external power supply. The power source switching unit is equipped on a power supply line with an AC adapter detection circuit and outputting a #AC-ADAP signal, and a temporary power supply circuit for temporarily supplying electric power to a DC-DC converter when the power supply is intercepted. The switching unit is further equipped with a battery switching circuit for switching the states of FET1, FET2, FET3, and FET4so that main and second batteries are both connected to the DC-DC converter in response to a change in the #AC-ADAP signal when the AC adapter is disconnected from the switching unit.

REFERENCES:
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patent: 5300874 (1994-04-01), Shimamoto et al.
patent: 5886424 (1999-03-01), Kim
patent: 5939799 (1999-08-01), Weinstein
patent: 6195754 (2001-02-01), Jardine et al.
patent: 6202171 (2001-03-01), Townsley et al.
patent: PEUMA 04-28194 (1992-07-01), None
patent: PUPA 08-079982 (1996-03-01), None
patent: PUPA 09-308131 (1996-05-01), None

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