Inventor
OZAWA HIDEKIYO
JP71 patents
⚠️ This page may combine multiple inventors who share the name “OZAWA HIDEKIYO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
FUJITSU LTD
46 patentsUS6492791B1Dec 10, 2002
Protection method, control circuit, and battery unit
FUJITSU LTD92 citations99
US5739667AApr 14, 1998
Control system for charging batteries and electronic apparatus using same
FUJITSU LTD259 citations99
US5959368ASep 28, 1999
Power supply apparatus for supplying power from a plurality of batteries to a plurality of loads, and electronic appliance using the power supply apparatus
FUJITSU LTD142 citations98
US5563493AOct 8, 1996
Power source system of portable information processing system using battery
FUJITSU LTD140 citations98
US6452364B1Sep 17, 2002
Battery charge control circuit, battery charging device, and battery charge control method
FUJITSU LTD53 citations96
US6420858B1Jul 16, 2002
DC-to-DC converter circuit having a power saving mode
FUJITSU LTD64 citations96
US6404076B1Jun 11, 2002
DC-DC converter circuit selecting lowest acceptable input source
FUJITSU LTD39 citations96
US6194875B1Feb 27, 2001
Controller for DC-DC converter
FUJITSU LTD62 citations96
US6046896AApr 4, 2000
DC-to-DC converter capable of preventing overvoltage
FUJITSU LTD45 citations96
US6028755AFeb 22, 2000
DC-to-DC converter capable of preventing overvoltages
FUJITSU LTD77 citations96
US6008629ADec 28, 1999
Charging-and-discharging device for an electronic apparatus, and an electronic apparatus including the same, utilizing a charging device providing a constant charging current
FUJITSU LTD43 citations96
US5808444ASep 15, 1998
Charging-and-discharging device, battery pack and electronic apparatus including them
FUJITSU LTD44 citations96
US5801514ASep 1, 1998
Charging-and-discharging control device, a battery pack, and an electronic apparatus with improved charge and discarge control
FUJITSU LTD78 citations96
US6051955AApr 18, 2000
Protection circuit and battery unit
FUJITSU LTD82 citations94
US5905361AMay 18, 1999
Charging-and-discharging device, constant-voltage and constant-current control circuit, and electronic device
FUJITSU LTD68 citations94
US7148587B2Dec 12, 2006
DC-DC converter circuit, power supply selection circuit, and apparatus useful for increasing conversion efficiency
FUJITSU LTD18 citations93
US7122995B2Oct 17, 2006
Multi-phase DC-DC converter and control circuit for multi-phase DC-DC converter
FUJITSU LTD20 citations93
US6989652B2Jan 24, 2006
Protection method, control circuit, and battery unit
FUJITSU LTD26 citations93
US6897635B2May 24, 2005
Method for predicting remaining charge of portable electronics battery
FUJITSU LTD26 citations93
US6657415B2Dec 2, 2003
Portable apparatus
FUJITSU LTD28 citations93
US6566766B2May 20, 2003
DC-DC converter circuit, power supply selection circuit, and apparatus
FUJITSU LTD27 citations93
US6204648B1Mar 20, 2001
DC-to-DC converter capable of preventing overvoltage
FUJITSU LTD38 citations93
US5781000AJul 14, 1998
Power control unit loading test method
FUJITSU LTD37 citations93
US5717318AFeb 10, 1998
Step-down type DC-DC regulator
FUJITSU LTD44 citations93
US5572112ANov 5, 1996
Power supply unit
FUJITSU LTD51 citations93
US7045990B2May 16, 2006
Portable device having a charging circuit and semiconductor device for use in the charging circuit of the same
FUJITSU LTD31 citations92
US6940737B2Sep 6, 2005
Power supply control method
FUJITSU LTD24 citations92
US6724175B1Apr 20, 2004
Power supply control device, power supply circuit, power supply control method, and electronic apparatus controlling output voltage thereof in accordance with a voltage detected across an on switching element
FUJITSU LTD29 citations92
US6664772B2Dec 16, 2003
DC to DC converter producing output voltage exhibiting rise and fall characteristics independent of load thereon
FUJITSU LTD19 citations92
US6498459B1Dec 24, 2002
Electronic equipment and battery unit
FUJITSU LTD20 citations92
US6414403B2Jul 2, 2002
Power unit
FUJITSU LTD41 citations92
US6147477ANov 14, 2000
DC to DC converter producing output voltage exhibiting rise and fall characteristics independent of load thereon
FUJITSU LTD32 citations92
US5717256AFeb 10, 1998
Power supply apparatus and electronic appliance equipped with the power supply apparatus
FUJITSU LTD29 citations92
US5625237AApr 29, 1997
Remove power source device having improved capacity indication capability, and an electronic device using the removable power source device
FUJITSU LTD42 citations92
US5610450AMar 11, 1997
Power supply apparatus for efficiently utilizing battery and electronic apparatus using the power supply
FUJITSU LTD63 citations92
US7098639B2Aug 29, 2006
DC-DC converter and method for controlling DC-DC converter
FUJITSU LTD27 citations91
US6465984B2Oct 15, 2002
Pseudo battery pack, battery pack, electronic apparatus, and electronic apparatus system and method
FUJITSU LTD31 citations91
US6262494B1Jul 17, 2001
Battery unit and information processing system having battery unit mounted therein
FUJITSU LTD39 citations91
US6020718AFeb 1, 2000
Battery capacity predicting method, battery unit and apparatus using battery unit
FUJITSU LTD48 citations91
US6486635B1Nov 26, 2002
Monitor signal output circuit, battery pack, battery voltage monitor circuit, battery system, apparatus, battery voltage monitor method, and battery voltage monitor program storage medium
FUJITSU LTD27 citations90
US7279870B2Oct 9, 2007
DC-DC converter and method of controlling DC-DC converter
FUJITSU LTD10 citations84
US7221131B2May 22, 2007
Control circuit for DC-DC converter in semiconductor integrated circuit device
FUJITSU LTD18 citations84
US7012558B1Mar 14, 2006
A/D converter, battery pack, electronics device and method of voltage measurement
FUJITSU LTD17 citations84
US5872445AFeb 16, 1999
Power supply device having low internal power consumption and electronic appliances using said power supply device
FUJITSU LTD18 citations84
US7019501B2Mar 28, 2006
DC/DC converter
FUJITSU LTD17 citations83
US7298117B2Nov 20, 2007
Step-up (boost) DC regulator with two-level back-bias switch gate voltage
FUJITSU LTD11 citations82
FUJITSU SEMICONDUCTOR LTD
2 patentsFUJITSU MICROELECTRONICS LTD
2 patentsShowing the top 50 of 71 patents by PatentIndex Score.