Inventor · disambiguated record
Hidekiyo Ozawa
Also filed as: OZAWA HIDEKIYO
70 granted patents·3 pending applications·2,314 citations·filing 1982–2008
99Inventor score
Top patents by PatentIndex Score
73 records- 0197US5739667AControl system for charging batteries and electronic apparatus using sameFUJITSU LTD·Filed 1995·Granted Apr 14, 1998·259 cites·10 claims
- 0293US6492791B1Protection method, control circuit, and battery unitFUJITSU LTD·Filed 2000·Granted Dec 10, 2002·92 cites·13 claims
- 0390US5563493APower source system of portable information processing system using batteryFUJITSU LTD·Filed 1993·Granted Oct 8, 1996·140 cites·42 claims
- 0489US6028755ADC-to-DC converter capable of preventing overvoltagesFUJITSU LTD·Filed 1999·Granted Feb 22, 2000·77 cites·46 claims
- 0589US5959368APower supply apparatus for supplying power from a plurality of batteries to a plurality of loads, and electronic appliance using the power supply apparatusFUJITSU LTD·Filed 1997·Granted Sep 28, 1999·142 cites·34 claims
- 0687US5572112APower supply unitFUJITSU LTD·Filed 1995·Granted Nov 5, 1996·51 cites·7 claims
- 0785US6404076B1DC-DC converter circuit selecting lowest acceptable input sourceFUJITSU LTD·Filed 2000·Granted Jun 11, 2002·39 cites·14 claims
- 0884US7122995B2Multi-phase DC-DC converter and control circuit for multi-phase DC-DC converterFUJITSU LTD·Filed 2005·Granted Oct 17, 2006·20 cites·20 claims
- 0984US6204648B1DC-to-DC converter capable of preventing overvoltageFUJITSU LTD·Filed 2000·Granted Mar 20, 2001·38 cites·41 claims
- 1084US5801514ACharging-and-discharging control device, a battery pack, and an electronic apparatus with improved charge and discarge controlFUJITSU LTD·Filed 1997·Granted Sep 1, 1998·78 cites·3 claims
- 1183US6452364B1Battery charge control circuit, battery charging device, and battery charge control methodFUJITSU LTD·Filed 2000·Granted Sep 17, 2002·53 cites·70 claims
- 1283US6046896ADC-to-DC converter capable of preventing overvoltageFUJITSU LTD·Filed 1996·Granted Apr 4, 2000·45 cites·52 claims
- 1382US7221131B2Control circuit for DC-DC converter in semiconductor integrated circuit deviceFUJITSU LTD·Filed 2005·Granted May 22, 2007·18 cites·20 claims
- 1482US7098639B2DC-DC converter and method for controlling DC-DC converterFUJITSU LTD·Filed 2003·Granted Aug 29, 2006·27 cites·17 claims
- 1582US6420858B1DC-to-DC converter circuit having a power saving modeFUJITSU LTD·Filed 1999·Granted Jul 16, 2002·64 cites·23 claims
- 1680US7279870B2DC-DC converter and method of controlling DC-DC converterFUJITSU LTD·Filed 2006·Granted Oct 9, 2007·10 cites·7 claims
- 1780US6486635B1Monitor signal output circuit, battery pack, battery voltage monitor circuit, battery system, apparatus, battery voltage monitor method, and battery voltage monitor program storage mediumFUJITSU LTD·Filed 2000·Granted Nov 26, 2002·27 cites·22 claims
- 1880US5905361ACharging-and-discharging device, constant-voltage and constant-current control circuit, and electronic deviceFUJITSU LTD·Filed 1997·Granted May 18, 1999·68 cites·22 claims
- 1979US7663345B2Circuit and method for controlling DC-DC converterFUJITSU MICROELECTRONICS LTD·Filed 2006·Granted Feb 16, 2010·16 cites·26 claims
- 2079US6465984B2Pseudo battery pack, battery pack, electronic apparatus, and electronic apparatus system and methodFUJITSU LTD·Filed 2000·Granted Oct 15, 2002·31 cites·19 claims
- 2178US7423415B2DC-DC converter and its control method, and switching regulator and its control methodFUJITSU LTD·Filed 2006·Granted Sep 9, 2008·7 cites·11 claims
- 2278US6566766B2DC-DC converter circuit, power supply selection circuit, and apparatusFUJITSU LTD·Filed 2002·Granted May 20, 2003·27 cites·1 claims
- 2377US6989652B2Protection method, control circuit, and battery unitFUJITSU LTD·Filed 2002·Granted Jan 24, 2006·26 cites·6 claims
- 2477US6051955AProtection circuit and battery unitFUJITSU LTD·Filed 1997·Granted Apr 18, 2000·82 cites·46 claims
- 2575US6940737B2Power supply control methodFUJITSU LTD·Filed 2003·Granted Sep 6, 2005·24 cites·2 claims
- 2674US7045990B2Portable device having a charging circuit and semiconductor device for use in the charging circuit of the sameFUJITSU LTD·Filed 2003·Granted May 16, 2006·31 cites·16 claims
- 2774US6724175B1Power 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 elementFUJITSU LTD·Filed 2000·Granted Apr 20, 2004·29 cites·47 claims
- 2873US6664772B2DC to DC converter producing output voltage exhibiting rise and fall characteristics independent of load thereonFUJITSU LTD·Filed 2001·Granted Dec 16, 2003·19 cites·33 claims
- 2973US6194875B1Controller for DC-DC converterFUJITSU LTD·Filed 1999·Granted Feb 27, 2001·62 cites·21 claims
- 3073US6147477ADC to DC converter producing output voltage exhibiting rise and fall characteristics independent of load thereonFUJITSU LTD·Filed 1997·Granted Nov 14, 2000·32 cites·41 claims
- 3173US5717318AStep-down type DC-DC regulatorFUJITSU LTD·Filed 1997·Granted Feb 10, 1998·44 cites·8 claims
- 3272US6657415B2Portable apparatusFUJITSU LTD·Filed 2001·Granted Dec 2, 2003·28 cites·21 claims
- 3372US5808444ACharging-and-discharging device, battery pack and electronic apparatus including themFUJITSU LTD·Filed 1997·Granted Sep 15, 1998·44 cites·4 claims
- 3471US7298117B2Step-up (boost) DC regulator with two-level back-bias switch gate voltageFUJITSU LTD·Filed 2006·Granted Nov 20, 2007·11 cites·11 claims
- 3571US6897635B2Method for predicting remaining charge of portable electronics batteryFUJITSU LTD·Filed 2003·Granted May 24, 2005·26 cites·27 claims
- 3671US6008629ACharging-and-discharging device for an electronic apparatus, and an electronic apparatus including the same, utilizing a charging device providing a constant charging currentFUJITSU LTD·Filed 1997·Granted Dec 28, 1999·43 cites·7 claims
- 3770US7781909B2Control circuit of power supply, power supply and control method thereofFUJITSU SEMICONDUCTOR LTD·Filed 2006·Granted Aug 24, 2010·4 cites·17 claims
- 3870US7148587B2DC-DC converter circuit, power supply selection circuit, and apparatus useful for increasing conversion efficiencyFUJITSU LTD·Filed 2003·Granted Dec 12, 2006·18 cites·12 claims
- 3968US5781000APower control unit loading test methodFUJITSU LTD·Filed 1996·Granted Jul 14, 1998·37 cites·23 claims
- 4068US5610450APower supply apparatus for efficiently utilizing battery and electronic apparatus using the power supplyFUJITSU LTD·Filed 1995·Granted Mar 11, 1997·63 cites·8 claims
- 4166US7705483B2DC-DC converter control circuit, DC-DC converter, power supply unit, and DC-DC converter control methodFUJITSU MICROELECTRONICS LTD·Filed 2006·Granted Apr 27, 2010·7 cites·14 claims
- 4265US6020718ABattery capacity predicting method, battery unit and apparatus using battery unitFUJITSU LTD·Filed 1996·Granted Feb 1, 2000·48 cites·75 claims
- 4364US7928601B2Power supply circuit for providing semiconductor integrated circuit device with a plurality of power supply voltagesFUJITSU SEMICONDUCTOR LTD·Filed 2005·Granted Apr 19, 2011·6 cites·2 claims
- 4463US7957165B2DC-DC converter with a plurality of soft-start control circuitsFUJITSU SEMICONDUCTOR LTD·Filed 2008·Granted Jun 7, 2011·6 cites·8 claims
- 4563USRE42114EControl system for charging batteries and electronic apparatus using sameFUJITSU SEMICONDUCTOR LTD·Filed 2000·Granted Feb 8, 2011·13 cites·80 claims
- 4663US7675267B2Control circuit of power supply and control method of the power supplyFUJITSU MICROELECTRONICS LTD·Filed 2006·Granted Mar 9, 2010·5 cites·11 claims
- 4763US7019501B2DC/DC converterFUJITSU LTD·Filed 2004·Granted Mar 28, 2006·17 cites·19 claims
- 4863US6414403B2Power unitFUJITSU LTD·Filed 1998·Granted Jul 2, 2002·41 cites·20 claims
- 4962US5625237ARemove power source device having improved capacity indication capability, and an electronic device using the removable power source deviceFUJITSU LTD·Filed 1995·Granted Apr 29, 1997·42 cites·34 claims
- 5061US6911806B2DC to DC converter producing output voltage exhibiting rise and fall characteristics independent of load thereonFUJITSU LTD·Filed 2003·Granted Jun 28, 2005·10 cites·13 claims
Showing the top 50 of 73 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →