Norikazu Tokunaga

Person

Hitachi-shi, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Backup power supply
- Patent number 7,157,810
- Issue date Jan 2, 2007
- Hitachi, Ltd.
- Akihiko Kanouda
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Power supply with uninterruptible function
- Patent number 7,053,502
- Issue date May 30, 2006
- Hitachi, Ltd.
- Nobuyuki Aihara
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Backup power supply
- Patent number 6,977,448
- Issue date Dec 20, 2005
- Hitachi, Ltd.
- Akihiko Kanouda
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Power supply with uninterruptible function
- Patent number 6,795,322
- Issue date Sep 21, 2004
- Hitachi, Ltd.
- Nobuyuki Aihara
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Parallel power source system
- Patent number 6,738,270
- Issue date May 18, 2004
- Renesas Technology Corporation
- Ryohei Saga
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
DC power supply device
- Patent number 6,643,152
- Issue date Nov 4, 2003
- Hitachi, Ltd.
- Norikazu Tokunaga
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Synchronized rectifier voltage step down DC-DC converter and contro...
- Patent number 6,603,671
- Issue date Aug 5, 2003
- Hitachi, Ltd.
- Norikazu Tokunaga
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Voltage regulator module for micro processor and CPO using a super...
- Patent number 6,580,597
- Issue date Jun 17, 2003
- Hitachi, Ltd.
- Akihiko Kanouda
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
DC-DC step-down converter with super capacitor
- Patent number 6,567,261
- Issue date May 20, 2003
- Hitachi, Ltd.
- Akihiko Kanouda
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
DC power supply device
- Patent number 6,507,507
- Issue date Jan 14, 2003
- Hitachi, Ltd.
- Norikazu Tokunaga
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Direct-current power-supply apparatus, control circuit thereof and...
- Patent number 6,496,395
- Issue date Dec 17, 2002
- Hitachi Ltd.
- Norikazu Tokunaga
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
DC-DC converter with switchable control mode
- Patent number 6,489,756
- Issue date Dec 3, 2002
- Hitachi, Ltd.
- Akihiko Kanouda
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Method of driving semiconductor switching device in non-saturated s...
- Patent number 6,381,152
- Issue date Apr 30, 2002
- Hitachi, Ltd.
- Tadashi Takahashi
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Charge and discharge system for electric power storage equipment
- Patent number 6,297,616
- Issue date Oct 2, 2001
- Hitachi, Ltd.
- Kenji Kubo
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Inverter apparatus and uinterruptible power supply using the same
- Patent number 5,446,645
- Issue date Aug 29, 1995
- Hitachi, Ltd.
- Hidefumi Shirahama
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Power supply control system
- Patent number 5,297,015
- Issue date Mar 22, 1994
- Hitachi, Ltd.
- Hideki Miyazaki
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Power conversion system, method for controlling the same, and unint...
- Patent number 5,285,365
- Issue date Feb 8, 1994
- Hitachi, Ltd.
- Ikuo Yamato
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Parallel circuit module including a diode and an IGBT
- Patent number 5,274,541
- Issue date Dec 28, 1993
- Hitachi, Ltd.
- Shin Kimura
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Parallel inverter control apparatus
- Patent number 5,262,935
- Issue date Nov 16, 1993
- Hitachi, Ltd.
- Hidefumi Shirahama
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Drive circuit for an insulated gate transistor having overcurrent d...
- Patent number 5,210,479
- Issue date May 11, 1993
- Hitachi, Ltd.
- Shin Kimura
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Circuit for controlling an electric power supply apparatus, a metho...
- Patent number 5,115,386
- Issue date May 19, 1992
- Hitachi, Ltd.
- Hidefumi Shirahama
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Switching power supply
- Patent number 4,933,830
- Issue date Jun 12, 1990
- Hitachi, Ltd.
- Masayoshi Sato
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Pulse width modulated inverter with high-to-low frequency output co...
- Patent number 4,878,163
- Issue date Oct 31, 1989
- Hitachi, Ltd.
- Ikuo Yamato
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Voltage resonance type switching power source apparatus
- Patent number 4,866,589
- Issue date Sep 12, 1989
- Hitachi, Ltd.
- Masayoshi Satoo
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Current and frequency converter having means to reduce switching lo...
- Patent number 4,855,887
- Issue date Aug 8, 1989
- Hitachi, Ltd.
- Ikuo Yamato
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Switching power supply
- Patent number 4,777,575
- Issue date Oct 11, 1988
- Hitachi Ltd.
- Ikuo Yamato
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Inverter type switching power supply with transformer and short cir...
- Patent number 4,737,974
- Issue date Apr 12, 1988
- Hirofumi Hino
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Semiconductor switching device having plural MOSFET's, GTO's or the...
- Patent number 4,692,643
- Issue date Sep 8, 1987
- Hitachi, Ltd.
- Norikazu Tokunaga
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Power supply apparatus for resistance welder including means for pr...
- Patent number 4,306,138
- Issue date Dec 15, 1981
- Hitachi, Ltd.
- Norikazu Tokunaga
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Gate control circuit with capacitor for field controlled thyristor
- Patent number 4,292,550
- Issue date Sep 29, 1981
- Hitachi, Ltd.
- Kenichi Onda
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER

Patents Applicationslast 30 patents

Information Patent Application
Power supply with uninterruptible function
- Publication number 20050078494
- Publication date Apr 14, 2005
- NOBUYUKI AIHARA
- Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
Information Patent Application
Backup power supply
- Publication number 20040145926
- Publication date Jul 29, 2004
- Akihiko Kanouda
- Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
Information Patent Application
DC-DC converter and a method of controlling thereof
- Publication number 20030197494
- Publication date Oct 23, 2003
- Hitachi, Ltd.
- Akihiko Kanouda
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Application
Backup power supply
- Publication number 20030184937
- Publication date Oct 2, 2003
- Hitachi, Ltd.
- Akihiko Kanouda
- Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
Information Patent Application
DC power supply device
- Publication number 20030107906
- Publication date Jun 12, 2003
- Hitachi, Ltd
- Norikazu Tokunaga
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Application
VOLTAGE REGULATOR MODULE FOR MICRO PROCESSOR AND CPO USING A SUPER...
- Publication number 20030042878
- Publication date Mar 6, 2003
- Akihiko Kanouda
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
DC-DC STEP-DOWN CONVERTER WITH AN ELECTRIC DOUBLE-LAYER CAPACITOR
- Publication number 20030039092
- Publication date Feb 27, 2003
- Hitachi, Ltd
- Akihiko Kanouda
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
DC-DC converter and a method of controlling thereof
- Publication number 20020185994
- Publication date Dec 12, 2002
- Hitachi, Ltd.
- Akihiko Kanouda
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Application
Backup power supply
- Publication number 20020186576
- Publication date Dec 12, 2002
- Akihiko Kanouda
- Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
Information Patent Application
DC-DC converter and control circuit therefor
- Publication number 20020136030
- Publication date Sep 26, 2002
- Hitachi, Ltd.
- Norikazu Tokunaga
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Application
DC-DC converter
- Publication number 20020080631
- Publication date Jun 27, 2002
- Akihiko Kanouda
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Application
Parallel power source system
- Publication number 20020074862
- Publication date Jun 20, 2002
- Ryohei Saga
- Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
Information Patent Application
Power Supply With Uninterrupted Function
- Publication number 20020071292
- Publication date Jun 13, 2002
- NOBUYUKI AIHARA
- Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
Information Patent Application
DC power supply device
- Publication number 20020067630
- Publication date Jun 6, 2002
- Hitachi, Ltd.
- Norikazu Tokunaga
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Application
Direct-current power-supply apparatus, control circuit thereof and...
- Publication number 20010026462
- Publication date Oct 4, 2001
- Norikazu Tokunaga
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...

Norikazu Tokunaga

Person

Patents Grantslast 30 patents

Backup power supply

Power supply with uninterruptible function

Backup power supply

Power supply with uninterruptible function

Parallel power source system

DC power supply device

Synchronized rectifier voltage step down DC-DC converter and contro...

Voltage regulator module for micro processor and CPO using a super...

DC-DC step-down converter with super capacitor

DC power supply device

Direct-current power-supply apparatus, control circuit thereof and...

DC-DC converter with switchable control mode

Method of driving semiconductor switching device in non-saturated s...

Charge and discharge system for electric power storage equipment

Inverter apparatus and uinterruptible power supply using the same

Power supply control system

Power conversion system, method for controlling the same, and unint...

Parallel circuit module including a diode and an IGBT

Parallel inverter control apparatus

Drive circuit for an insulated gate transistor having overcurrent d...

Circuit for controlling an electric power supply apparatus, a metho...

Switching power supply

Pulse width modulated inverter with high-to-low frequency output co...

Voltage resonance type switching power source apparatus

Current and frequency converter having means to reduce switching lo...

Switching power supply

Inverter type switching power supply with transformer and short cir...

Semiconductor switching device having plural MOSFET's, GTO's or the...

Power supply apparatus for resistance welder including means for pr...

Gate control circuit with capacitor for field controlled thyristor

Patents Applicationslast 30 patents

Power supply with uninterruptible function

Backup power supply

DC-DC converter and a method of controlling thereof

Backup power supply

DC power supply device

VOLTAGE REGULATOR MODULE FOR MICRO PROCESSOR AND CPO USING A SUPER...

DC-DC STEP-DOWN CONVERTER WITH AN ELECTRIC DOUBLE-LAYER CAPACITOR

DC-DC converter and a method of controlling thereof

Backup power supply

DC-DC converter and control circuit therefor

DC-DC converter

Parallel power source system

Power Supply With Uninterrupted Function

DC power supply device

Direct-current power-supply apparatus, control circuit thereof and...