Battery connecting device for a computer system and a method of

Details Battery connecting device for a computer system and a method of Battery connecting device for a computer system and a method of

1995-07-26

1998-07-21

Sheikh, Ayaz R.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

39575008, 307 66, 320 14, 320 15, H02J 700, G06F 126

Patent

active

057846260

ABSTRACT:
Two batteries can be selectively coupled to a computer, each through a separate pair of serially coupled transistors. Each of the four transistors is shunted by a diode, and each transistor can be individually controlled by a control circuit. To couple one of the batteries to the computer, the control circuit activates one pair of transistors, such that the battery current flows through the transistors and not through the diodes, thereby avoiding any power loss that would occur in the diodes. When switching from one battery to the other, the control circuit enters an intermediate mode in which one transistor in each of the two pairs of transistors is switched OFF, such that both batteries are momentarily "OR" coupled to the computer through two of the diodes, thereby preventing a momentary loss of power during the switching operation. A door covers both batteries such that neither battery can be removed except when the door is open. A door switch sends a signal to the control circuit that indicates door position. When the door is open, the control circuit "OR" couples both batteries to the computer through two of the diodes, thereby permitting either battery to be removed without interrupting power to the computer.

REFERENCES:
patent: 4079303 (1978-03-01), Cox
patent: 4163935 (1979-08-01), Sakurada et al.
patent: 4914469 (1990-04-01), Ishimura et al.
patent: 5057779 (1991-10-01), Mittel
patent: 5243269 (1993-09-01), Katayama et al.
patent: 5300874 (1994-04-01), Shimamoto et al.
patent: 5448719 (1995-09-01), Schultz et al.

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