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Battery-pack-with-single-charge-inhibit-regulator-transistor

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Battery pack with single charge-inhibit/regulator transistor

Details

Inventors: Freiman, Joseph F.; McConkey, Steven Kent; Mitchell, Nathan Austin;
Assignee: Compaq Computer Corporation (Houston, TX)
Primary Examiner: Berhane; Adolf
Assistant Examiner: Shin; K.
Attorney, Agent or Firm: Pravel, Hewitt, Kimball & Krieger

A battery pack for use in a portable computing system includes a transistor that is used both for inhibiting charging of the batteries within the system and for limiting the voltage across the batteries in the battery pack. Rather than having two separate devices to inhibit and regulate, this single transistor performs the functions of both, thus reducing component count in a battery pack.

DETAILED DESCRIPTION The present invention relates to a battery pack with lithium-ion batteries.
Such a battery pack includes enabling and disabling circuitry that enables and disables charge based upon whether the batteries are placed into a known system and whether the batteries have failed.
That same transistor, however, also acts as a pass element in a linear regulator, regulating the voltage to the lithium-ion batteries themselves.
In this way, a single transistor operates as both an on/off switch for inhibiting or allowing charge as well as a pass element for regulating voltage, reducing component count.

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