公开(公告)号：JP2001186680A

公开(公告)日：2001-07-06

申请号：JP34930699

申请日：1999-12-08

Applicant: IBM

Inventor： ODAOHARA SHIGEFUMI ,  KUMAKI ATSUSHI ,  MITO TOSHITSUGU ,  NAKAGAWA HIROSHI ,  NAKAMURA TETSUSHI

IPC: H02J7/02 ,  G06F1/16 ,  H02J7/00

Abstract: PROBLEM TO BE SOLVED: To provide a charge control method which can perform efficient charge in the case where the charge is stopped halfway, and a computer where that charge control method is applied. SOLUTION: The charge of the main battery is started, and at the point of time when the capacity of the main battery reaches a specified value, the charge of the main battery is stopped (steps 200-204). Then, the charge of the second battery is started, and at the point of time when the capacity of the second battery reaches a specified value, the charge of the second battery is stopped (steps 206-210). Then, the charge of the main battery is restarted, and at the point of time when the capacity of the main battery becomes 100%, the charge of the main battery is stopped, and then the charge of the second battery is restarted, and at the point of time when the capacity of the second battery becomes 100%, the charge of the second battery is stopped (steps 212-222).

公开(公告)号：JPH09233713A

公开(公告)日：1997-09-05

申请号：JP3219196

申请日：1996-02-20

Applicant: IBM ,  A T BATTERY KK ,  TOSHIBA BATTERY

Inventor： MITO TOSHITSUGU ,  KIZAWA MASAHITO ,  NAKAGAWA HIROSHI ,  MUKAI KAZUO ,  SHIOJIMA NOBUO ,  ISSHIKI MASANORI ,  ITO NORIYUKI

IPC: G01R31/36 ,  H01M10/44 ,  H01M10/48 ,  H02H7/18 ,  H02J7/00

Abstract: PROBLEM TO BE SOLVED: To inform used equipment such as a charger or a batter of its abnormality and prevent overcharge or overdischarge by changing the temperature detection output into the signal equivalent abnormal temperature, when this protective circuit detects the abnormality of the charge condition or discharge condition of a secondary battery. SOLUTION: Secondary batteries 1 and 2 are charged by fixed voltage charge method used for, for example, a lithium secondary battery, a lead battery, etc. The batteries 1 and 2 are connected in series, and n-channel FETs 3 and 4 constituting first and second switch elements are connected in series to the charge/discharge circuit. The parasitic diodes D1 and D2 of the FETs 3 and 4 get in forward direction at the time of charge and discharge. In a protective circuit, the + terminal, to the + terminal of the battery 1, and the - terminal, to the source of the FET 3, and a thermistor 1, between the outer terminal T and the - terminal, are connected. The thermistor 11 operates overcharge or overdischarge preventive circuits 5 or 6 through a transistor 12 and an abnormality detection circuit 10 so as to charge or discharge it properly when the temperature during charge or discharge deviates from the specified range.

公开(公告)号：JP2002076868A

公开(公告)日：2002-03-15

申请号：JP2000247048

申请日：2000-08-16

Applicant: IBM

Inventor： ODAOHARA SHIGEFUMI ,  NAKAGAWA HIROSHI

IPC: H02M3/155 ,  H02M1/00 ,  H02M3/158 ,  H03K17/06 ,  H03K17/08 ,  H03K17/082 ,  H03K17/14 ,  H03K17/687

Abstract: PROBLEM TO BE SOLVED: To provide a voltage converter that can reduce the circuit area by incorporating a protection circuit to a switching element where high-speed switching is a requirement so as to solve a problem of the layout of the protection circuit. SOLUTION: The voltage converter that converts an input voltage (Vin) 11 into an output voltage (Vout) 18, is provided with a 1st FET (FET 1) 21 that applies ON/OFF switching to the input voltage (Vin) 11 to provide an output of a voltage, a 2nd FET (FET 2) 14 that provides an output of a voltage for a period when the 1st FET (FET 1) 21 is turned off, a PWM controller 15 that controls the switching operation of the 1st FET (FET 1) 21 and the 2nd FET (FET 2) 14, and the protection circuit 30 that receives its operating power from a drain terminal 22 of the 1st FET (FET 1) 21 and short-circuits a gate terminal 23 and a source terminal 24 of the 1st FET (FET 1) 21 when the temperature of the 1st FET (FET 1) 21 and the 2nd FET (FET 2) 14 reaches a prescribed temperature or over.

公开(公告)号：JP2002075466A

公开(公告)日：2002-03-15

申请号：JP2000247050

申请日：2000-08-16

Applicant: IBM

Inventor： ODAOHARA SHIGEFUMI ,  NAKAGAWA HIROSHI ,  TSURUKAWA NOBORU ,  NISHIO TOMONORI

IPC: G01R31/36 ,  H01M10/44 ,  H01M10/48 ,  H02J7/00 ,  H02J7/34

Abstract: PROBLEM TO BE SOLVED: To detect a generation of a memory effect more accurately, while making a secondary cell operate as usual. SOLUTION: It is so regarded that a memory effect is generated, when a cell voltage during discharge is measured and the fact that the cell voltage is too low against the charging current, is detected. The electric power supply device comprises an intelligent cell 12 supplying electric power to a main body circuit, a current measuring circuit 30 measuring a current during discharge, a voltage measuring circuit 40 measuring a voltage during discharge, and a controller 15 detecting the generation of memory effect by judging whether the voltage during discharge measured against the current during discharge when the detected cell capacity is lower than the prescribed capacity, is lower than the prescribed voltage or not.