Electricity: battery or capacitor charging or discharging – Means to identify cell or battery type
Patent
1999-07-06
2000-07-11
Tso, Edward H.
Electricity: battery or capacitor charging or discharging
Means to identify cell or battery type
320DIG12, H01M 1046
Patent
active
060878037
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a battery pack to be loaded into electronic equipment, e.g., a portable personal computer, to supply power, and also relates to an electronic equipment system having a battery pack and electronic equipment, as well as to a loading detecting method for the battery pack, which detects whether or not the battery pack is loaded in the electronic equipment.
BACKGROUND ART
Electronic equipment is being increasingly provided as portable electronic equipment, e.g., the so-called notebook-type personal computers, information terminals, video tape recorders, sound recorders and/or portable telephones, etc. and there are, e.g., electric bicycles provided with a motor for power assist, etc.
Such electronic equipment is adapted so that a battery pack (also called a battery package) is loaded into the equipment for the purpose of supplying power from the battery pack for operating the equipment.
An explanation will be given by taking the example of a notebook personal computer and battery pack therefor as an example of the prior art.
The function to detect whether or not a conventional battery pack is electrically connected to the body of the notebook personal computer be explained with reference to FIG. 1.
FIG. 1 shows a portion of the circuit configuration of an interface of a notebook personal computer 1000 and a battery pack 1002.
The notebook personal computer 1000 and the battery pack 1002 are detachably connected by a connecting portion 1003. A battery plus terminal (Batt+terminal) 1003a and a battery minus terminal (Batt-terminal) 1003e are connecting portions for power supply of the notebook personal computer 1000 and the battery pack 1002. The notebook personal computer 1000 can collect respective information of the battery pack 1002 such as charge/discharge current, battery voltage and capacity, etc. through a communication line from the battery pack 1002.
In FIG. 1, there is shown a communication system of the two wire type having a data line and a clock line, and the data line and the clock line of the notebook personal computer 1000 and the battery pack 1002 are respectively connected by a data terminal 1003b and a clock terminal 1003c. A B-IN terminal 1003d is a connecting portion of a detection line 1002e relating to the loading state of the battery pack 1002 in the body of the notebook personal computer 1000.
Reference numeral 1001a indicates a 5V power supply line of the notebook personal computer 1000, reference numeral 1001f indicates a communication LSI (Large Scale Integrated) Circuit of the notebook personal computer 1000, reference numeral 1001b indicates a pull-up resistor Rn 1 (e.g., 4.7 k.OMEGA.) of the data line, and reference numeral 1001c indicates a pull-up resistor Rn2 (e.g., 4.7 k.OMEGA.) of the clock line. Reference numeral 1001d indicates a pull-down resistor Rn3 (e.g., 10 k.OMEGA.) for allowing the loading state detection line 1002e of the battery pack 1002 to be at an L level (low).
Reference numeral 1002a indicates a 5V power supply line of the battery pack 1002, and reference numeral 1002f indicates a CPU (Central Processing Unit) for charge/discharge control of the battery pack 1002, communication with the notebook personal computer 1000 and various calculations. Reference numeral 1002d indicates a pull-up resistor Rp3 (e.g., 1 M.OMEGA.) of the loading state detection line of the battery pack 1002.
Let us consider the case where an AC adapter (A.C. current adapter) is not connected to the notebook personal computer 1000 and the 5V power supply line 1001a of the notebook personal computer 1000 has a high impedance. Before loading of the battery pack 1002 is detected, the CPU 1002f of the battery pack 1002 does not deliver power to the notebook personal computer 1000. When the battery pack 1002 is loaded, the signal level of the loading state detection line 1002e of the battery pack 1002 shifts from the H level (high) to the L level (low) by a resistor (Rn3) 1001d of the notebook personal computer 1000, and the CPU 1002f thus detects loa
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patent: 5861812 (1999-01-01), Mitchell et al.
patent: 5870025 (1999-02-01), Hinohara
Eguchi Yasuhito
Yoshida Kazuhiko
Sony Corporation
Tso Edward H.
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