Power source system of portable information processing system using battery

• US 5,563,493 A
• Filed: 12/30/1993
• Issued: 10/08/1996
• Est. Priority Date: 01/13/1993
• Status: Expired due to Term

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Ozawa, Hidekiyo, Yano, Hidetoshi, Matsuda, Kouichi, Obitsu, Toshiro, Yamamoto, Tetsuo
• Primary Examiner(s): NAPPI, ROBERT E
• Application Number:
  US08/175,723
• Time in Patent Office: 1,013 Days
• Field of Search: 320/6, 320/8, 320/5, 320/15, 361/685, 361/683
• US Class Current: 320/124
• CPC Class Codes: G06F 1/263 Arrangements for using multiple switchable power supplies, e.g. battery and AC G06F1/30 takes precedence
• CPC Class Codes: H02J 7/0024 Parallel/serial switching of connection of batteries to charge or load circuit
• CPC Class Codes: H02J 7/0031 using battery or load disconnect circuits H02J9/002 takes precedence
• CPC Class Codes: H02J 7/0036 using connection detecting circuits H02J7/0034 takes precedence
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence
• CPC Class Codes: H02J 7/0071 with a programmable schedule
• CPC Class Codes: H02J 9/061 for DC powered loads

Abstract

A system comprises: a portable computer main body having therein a power source circuit section having a battery pack; and a plurality of auxiliary battery units which are mechanically connected and fixed to a casing of the computer main body and are electrically connected in series to a power source input terminal. A charge/discharge control section is provided for each of the auxiliary battery units. The charge/discharge control section sequentially charges from the auxiliary battery unit locating on the computer main body side when charging. On the contrary, the charge/discharge control section sequentially discharges from the auxiliary battery unit on the opposite side which is farthest from the computer main body when discharging. There is also a system construction having a single auxiliary battery unit.

Claims

1. A power source system of an information processing system, comprising:

a portable system main body having power source circuit means;

a plurality of auxiliary battery units which are connected and fixed to a casing of said system main body and are electrically connected in series to a power source input terminal of said power source circuit means; and

battery circuit means mounted within each auxiliary battery unit for sequentially charging each of said auxiliary battery units starting from the auxiliary battery unit located on the system main body side and for sequentially discharging each of said auxiliary battery units starting from the auxiliary battery unit located on the side farthest from said system main body.

2. A system according to claim 1, wherein each of said auxiliary battery units comprises:

a battery pack in which a plurality of battery cells connected in series are enclosed;

an input terminal electrically connected to said battery pack and electrically connected to an output terminal of a second auxiliary battery unit or an output terminal of AC adapter means which converts AC power to DC power;

an output terminal electrically connected to said battery pack and to an input terminal of the second auxiliary battery unit or said power source input terminal of said power source circuit means;

voltage detecting means for detecting an input power source voltage from said input terminal;

current detecting means for detecting an output current to said output terminal;

first discharge switching means for turning ON/OFF the electrical connection to said output terminal;

second discharge switching means for turning ON/OFF the electrical connection from said battery pack;

charge switching means for turning ON/OFF the electrical connection from said input terminal to said battery pack;

charge control means for detecting the electrical connection of said AC adapter means to the input terminal from the detection voltage of said voltage detecting means and for turning ON said charge switching means; and

discharge control means for turning ON said first discharge switching means and turning OFF said second discharge switching means and supplying external power to the auxiliary battery unit when the electrical connection of said AC adapter means or the second auxiliary battery unit is detected from the detection voltage of said voltage detecting means, and for turning ON said first and second discharge switching means and supplying power from said battery pack to the auxiliary battery unit at the front stage when non-electrical connection of said AC adapter means or the second auxiliary battery unit is detected from the detection voltage of said voltage detecting means.

3. A system according to claim 2, wherein said charge switching means comprises:

high speed charging means for supplying a current near a maximum allowable charge current of said battery pack and for charging at a high speed; and

trickle charging means electrically connected in parallel to said high speed charging means for supplying an arbitrary current which is determined by a voltage difference between said input power source voltage and the charging voltage of said battery pack and a specified resistance value,

wherein said charge control means makes said high speed charging means operative when the detection current of said current detecting means is equal to or less than a predetermined value in a state in which the electrical connection of said AC adapter means is detected, thereby charging at a high speed, and makes said trickle charging means operative when the detection current exceeds the predetermined value, thereby trickle charging.

4. A system according to claim 2, wherein said charge control means turns OFF said charge switching means and stops charging when an elapsed time of a timer which was activated at the start of the charging reaches a predetermined time.

5. A system according to claim 2, wherein said charge control means turns OFF said charge switching means and stops charging when a detection temperature by temperature detecting means provided for said battery pack exceeds a predetermined temperature.

6. A system according to claim 2, wherein said charge control means monitors the power source voltage of the battery pack and in a case where a change such that the voltage which rises in association with the charging exceeds a peak voltage and decreases is detected, the charge control means turns OFF the charge switching means, and stops the charging.

7. A system according to claim 1, further comprising display means for indicating a state of the auxiliary battery unit.

8. A system according to claim 7, wherein said display means displays at least an inputting state of the external power source for the input terminal, a charging state, and a state of the battery voltage.

9. A system according to claim 7, wherein said display means has display switching means for displaying information only during an ON operation.

10. A system according to claim 2, wherein said discharge control means turns off the second discharge switching means and disconnects the battery pack in the case where the discharge current of the battery pack is detected and is equal to an overcurrent.

11. A system according to claim 2, wherein said discharge control means turns off the first and second discharge switching means and shuts off the power supply to the unit at the front stage in the case where the discharge voltage of the battery pack is detected and is equal to or less than a specified voltage.

12. A system according to claim 1, wherein said power source circuit means of said system main body comprises:

a battery pack in which a plurality of battery cells electrically connected in series are enclosed;

a power source input terminal to which an output terminal of another auxiliary battery unit or an output terminal of an AC adapter means for converting AC power into DC power;

an output terminal to supply a power source to a main body circuit section;

voltage detecting means for detecting an input voltage from said input terminal;

current detecting means for detecting an output current to said output terminal;

discharge switching means for turning ON/OFF the electrical connection from said battery pack;

charge switching means for turning ON/OFF the electrical connection from said power source input terminal to said battery pack;

charge control means for detecting the electrical connection of said AC adapter means from the detection voltage of said voltage detecting means and for turning ON said charge switching means and charging said battery pack only in the case where the detection current of said current detecting means is equal to or less than a predetermined value; and

discharge control means for turning OFF said discharge switching means and electrically disconnecting said battery pack in the case where the electrical connection of the AC adapter means or the auxiliary battery unit is detected from the detection voltage of said voltage detecting means and for turning ON the discharge switching means and supplying the power source from the battery pack to the main body circuit section in the case where the non-electrical connection of the AC adapter means or the auxiliary battery unit is detected from the detection voltage of said voltage detecting means.

13. A system according to claim 12, wherein said charge switching means comprises:

high speed charging means for supplying a current near a maximum allowable charge current of said battery pack and charging at a high speed; and

trickle charging means electrically connected in parallel to said high speed charging means for charging the battery pack by an arbitrary current which is determined by a voltage difference between the input power source voltage and the charging voltage of said battery pack and a specified resistance value; and

wherein said charge control means makes the high speed charging means operative when the detection current of said current detecting means is equal to or less than a predetermined value in a state in which the electrical connection of the AC adapter means is detected, thereby charging at a high speed, and also makes said trickle charging means operative when said detection current exceeds said predetermined value, thereby trickle charging.

14. A system according to claim 12, wherein said charge control means turns OFF said charge switching means and stops the discharging when an elapsed time of a timer activated at the start of the charging reaches a predetermined time.

15. A system according to claim 12, wherein said charge control means turns OFF said discharge switching means and stops the discharging when a detection temperature by temperature detecting means provided for said battery pack exceeds a predetermined temperature.

16. A system according to claim 12, wherein said charge control means monitors the power source voltage of said battery pack and, when a change such that the voltage which rises in association with the charging exceeds a peak voltage and decreases is detected, said charge control means turns OFF said discharge switching means and stops the discharge.

17. A system according to claim 12, further comprising display means for indicating a state of said power source circuit means.

18. A system according to claim 17, wherein said display means displays at least an inputting state of the external power source for said input terminal, a charging state, and a state of the battery voltage.

19. A system according to claim 17, wherein said display means has display switching means for displaying information only during an ON operation.

20. A system according to claim 12, wherein said discharge control means turns OFF said discharge switching means and electrically disconnects said battery pack in the case where the discharge current of the battery pack is detected and is equal to an overcurrent.

21. A system according to claim 12, wherein said discharge control means turns OFF said discharge switching means and electrically disconnects the power supply to said main body circuit section in a case where the discharging voltage of said battery pack is detected and is equal to or less than a specified voltage.

22. A power source system of an information processing system, comprising:

a portable system main body having power source circuit means;

a single auxiliary battery unit which is connected and fixed to a casing of said system main body and is electrically connected in series to a power source input terminal of said power source circuit means; and

battery circuit means mounted within the auxiliary battery unit for sequentially charging said auxiliary battery unit in accordance with an order of the power source circuit means of the system main body and the auxiliary battery unit and for sequentially discharging said auxiliary battery unit in accordance with the order of the auxiliary battery unit and the power source circuit means of the system main body.

23. A system according to claim 22, wherein said battery circuit means of said auxiliary battery unit comprises:

a battery pack in which a plurality of battery cells electrically connected in series are enclosed;

an input terminal electrically connected to said battery pack and electrically connected to an output terminal of AC adapter means for converting AC power into DC power;

an output terminal electrically connected to said power source input terminal of said power source circuit means;

voltage detecting means for detecting an input power source voltage from said input terminal;

current detecting means for detecting an output current to said output terminal;

discharge switching means for turning ON/OFF the electrical connection from said battery pack to said output terminal;

charge switching means for turning ON/OFF the electrical connection from said input terminal to said battery pack;

charge control means for detecting the electrical connection of said AC adapter means from the detection voltage of said voltage detecting means and for turning ON said charge switching means; and

discharge control means for turning ON said discharge switching means and supplying external power to said system main body at the front stage in the case where the electrical connection of said AC adapter means is detected from the detection voltage of said voltage detecting means and for turning ON the discharge switching means and supplying a power source from said self battery pack to said system main body at the front state in the case where the non-electrical connection of the AC adapter means is detected from the detection voltage of said voltage detecting means.

24. A system according to claim 22, wherein said charge switching means comprises:

high speed charging means for supplying a current near a maximum allowable charge current of said battery pack, thereby charging at a high speed; and

trickle charging means electrically connected in parallel to said high speed charging means for supplying an arbitrary current which is determined by a voltage difference between said input power source voltage and the charging voltage of the battery pack and a specified resistance value and wherein said charge control means makes said high speed charging means operative when the detection current of said current detecting means is equal to or less than a predetermined value in a state in which the electrical connection of said AC adapter means is detected, thereby charging at a high speed, and also makes said trickle charging means operative when said detection current exceeds said predetermined value, thereby trickle charging.

25. A system according to claim 23, wherein said charge control means turns OFF said charge switching means and stops the charging when an elapsed time of a timer activated at the start of the charging reaches a predetermined time.

26. A system according to claim 23, wherein said charge control means turns OFF said charge switching means and stops the charging when a detection temperature by temperature detecting means provided for said battery pack exceeds a predetermined temperature.

27. A system according to claim 23, wherein said charge control means monitors the power source voltage of said battery pack and when a change such that the voltage which rises in association with the charging exceeds a peak voltage and decreases is detected, said charge control means turns off said charge switching means and stops the charging.

28. A system according to claim 22, further comprising display means for indicating a state of said auxiliary battery unit.

29. A system according to claim 28, wherein said display means displays at least an inputting state of an external power source to said input terminal, a charging state, and a state of the battery voltage.

30. A system according to claim 28, wherein said display means has display switching means for displaying information only during an ON operation.

31. A system according to claim 23, wherein said discharge control means turns OFF said discharge switching means and electrically disconnects said battery pack in a case where the discharge current of the battery pack is detected and is equal to an overcurrent.

32. A system according to claim 23, wherein said discharge control means turns OFF said discharge switching means and electrically disconnects the power supply to said system main body at the front stage in the case where the discharge voltage of the battery pack is detected and is equal to a specified voltage.

33. A system according to claim 22, wherein said power source circuit means of said system main body comprises:

a battery pack in which a plurality of battery cells electrically connected in series are enclosed;

a power source input terminal to which an output terminal of said auxiliary battery unit or an output terminal of AC adapter means for converting AC power into DC power;

an output terminal to supply a power source to a main body circuit section;

voltage detecting means for detecting an input voltage from said input terminal;

current detecting means for detecting an output current to said output terminal;

discharge switching means for turning ON/OFF the electrical connection from said battery pack;

charge switching means for turning ON/OFF the electrical connection from said power source input terminal to the battery pack;

charge control means for detecting the electrical connection of said AC adapter means from the detection voltage of said voltage detecting means and for turning ON said charge switching means and charging said battery pack only when the detection current of said current detecting means is equal to or less than a predetermined value; and

discharge control means for turning OFF said discharge switching means and electrically disconnecting said battery pack in the case where the electrical connection of said AC adapter means or said auxiliary battery unit is detected from the detection voltage of said voltage detecting means, and for turning ON the discharge switching means and supplying the power source from the battery pack to said main body circuit section in the case where the non-electrical connection of the AC adapter means or said auxiliary battery unit is detected from the detection voltage of said voltage detecting means.

34. A system according to claim 33, wherein said charge switching means comprises:

high speed charging means for supplying a current near a maximum allowable charge current of said battery pack, thereby charging at a high speed; and

trickle charging means electrically connected in parallel to said high speed charging means for charging said battery pack by an arbitrary current which is determined by a voltage difference between the input power source voltage and the charging voltage of said battery pack and a specified resistance value, and

wherein said charge control means makes said high speed charging means operative when the detection current of said current detecting means is equal to or less than a predetermined value in a state in which the electrical connection of said AC adapter means is detected, thereby charging at a high speed, and also makes said trickle charging means operative when said detection current exceeds said predetermined value, thereby trickle charging.

35. A system according to claim 33, wherein said charge control means turns off said charge switching means and stops the discharging when the elapsed time of a timer activated at the start of the charging reaches a predetermined time.

36. A system according to claim 33, wherein said charge control means turns OFF said discharge switching means and stops the discharging when a detection temperature by temperature detecting means provided for said battery pack exceeds a predetermined temperature.

37. A system according to claim 33, wherein said charge control means monitors the power source voltage of said battery pack and when a change such that the voltage which rises in association with the charging exceeds a peak voltage and decreases is detected, said charge control means turns off said discharge switching means and stops the discharging.

38. A system according to claim 33, further comprising display means for indicating a state of said power source circuit means.

39. A system according to claim 38, wherein said display means displays at least an inputting state of an external power source to said input terminal, a charging state, and a state of the battery voltage.

40. A system according to claim 38, wherein said display means has display switching means for displaying information only during an ON operation.

41. A system according to claim 33, wherein said discharge control means turns OFF said discharge switching means and electrically disconnects said battery pack in a case where the discharge current of the battery pack is detected and is equal to an overcurrent.

42. A system according to claim 33, wherein said discharge control means turns OFF said discharge switching means and electrically disconnects the power supply to said main body circuit section in a case where the discharging voltage of said battery pack is detected and is equal to or less than a specified voltage.