Inventor
TOKUNAGA NORIKAZU
32 patents
⚠️ This page may combine multiple inventors who share the name “TOKUNAGA NORIKAZU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
27 patentsUS6297616B1Oct 2, 2001
Charge and discharge system for electric power storage equipment
HITACHI LTD132 citations98
US5297015AMar 22, 1994
Power supply control system
HITACHI LTD170 citations98
US6795322B2Sep 21, 2004
Power supply with uninterruptible function
HITACHI LTD369 citations97
US6489756B2Dec 3, 2002
DC-DC converter with switchable control mode
HITACHI LTD63 citations96
US5446645AAug 29, 1995
Inverter apparatus and uinterruptible power supply using the same
HITACHI LTD279 citations96
US4692643ASep 8, 1987
Semiconductor switching device having plural MOSFET's, GTO's or the like connected in series
HITACHI LTD114 citations96
US6580597B2Jun 17, 2003
Voltage regulator module for micro processor and CPO using a super capacitor
HITACHI LTD48 citations95
US4777575AOct 11, 1988
Switching power supply
HITACHI LTD56 citations95
US5210479AMay 11, 1993
Drive circuit for an insulated gate transistor having overcurrent detecting and adjusting circuits
HITACHI LTD58 citations94
US6643152B2Nov 4, 2003
DC power supply device
HITACHI LTD26 citations92
US6603671B2Aug 5, 2003
Synchronized rectifier voltage step down DC-DC converter and control circuit therefor
HITACHI LTD22 citations92
US6507507B2Jan 14, 2003
DC power supply device
HITACHI LTD41 citations92
US6381152B1Apr 30, 2002
Method of driving semiconductor switching device in non-saturated state and power supply apparatus containing such a switching device
HITACHI LTD32 citations92
US5285365AFeb 8, 1994
Power conversion system, method for controlling the same, and uninterruptible power supply using the same
HITACHI LTD49 citations92
US5274541ADec 28, 1993
Parallel circuit module including a diode and an IGBT
HITACHI LTD32 citations92
US5262935ANov 16, 1993
Parallel inverter control apparatus
HITACHI LTD41 citations92
US4933830AJun 12, 1990
Switching power supply
HITACHI LTD31 citations92
US6567261B2May 20, 2003
DC-DC step-down converter with super capacitor
HITACHI LTD37 citations91
US6496395B2Dec 17, 2002
Direct-current power-supply apparatus, control circuit thereof and semiconductor integrated circuit device for power supply
HITACHI LTD28 citations91
US4866589ASep 12, 1989
Voltage resonance type switching power source apparatus
HITACHI LTD28 citations90
US5115386AMay 19, 1992
Circuit for controlling an electric power supply apparatus, a method therefor and an uninterruptible power supply
HITACHI LTD48 citations89
US4878163AOct 31, 1989
Pulse width modulated inverter with high-to-low frequency output converter
HITACHI LTD23 citations82
US4855887AAug 8, 1989
Current and frequency converter having means to reduce switching losses
HITACHI LTD8 citations74
US4292550ASep 29, 1981
Gate control circuit with capacitor for field controlled thyristor
HITACHI LTD8 citations74
US4122516AOct 24, 1978
Inverter control apparatus
HITACHI LTD7 citations74
US4306138ADec 15, 1981
Power supply apparatus for resistance welder including means for preventing polarized transformer excitation
HITACHI LTD4 citations61
US4084222AApr 11, 1978
High-voltage power supply device
HITACHI LTD0 citations38