Inventor
KITAGAWA SEIYA
JP23 patents
⚠️ This page may combine multiple inventors who share the name “KITAGAWA SEIYA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
FUJITSU LTD
17 patentsUS6204633B1Mar 20, 2001
Power supply apparatus with chargeable battery and charge/discharge method
FUJITSU LTD87 citations98
US5831418ANov 3, 1998
Step-up/down DC-to-DC converter
FUJITSU LTD111 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
US6194875B1Feb 27, 2001
Controller for DC-DC converter
FUJITSU LTD62 citations96
US6091234AJul 18, 2000
Control circuit of a synchronous rectification type DC-DC converter
FUJITSU LTD53 citations96
US5898234AApr 27, 1999
Power supply unit with simplified circuitry
FUJITSU LTD74 citations96
US6707271B2Mar 16, 2004
Power supply apparatus with chargeable battery and charge/discharge method
FUJITSU LTD35 citations92
US6664772B2Dec 16, 2003
DC to DC converter producing output voltage exhibiting rise and fall characteristics independent of load thereon
FUJITSU LTD19 citations92
US6624613B2Sep 23, 2003
Power supply apparatus with chargeable battery and charge/discharge method
FUJITSU LTD19 citations92
US6445164B2Sep 3, 2002
Power supply apparatus with chargeable battery and charge/discharge method
FUJITSU LTD32 citations92
US6414403B2Jul 2, 2002
Power unit
FUJITSU LTD41 citations92
US6169392B1Jan 2, 2001
DC-DC converter circuit
FUJITSU LTD33 citations92
US6147477ANov 14, 2000
DC to DC converter producing output voltage exhibiting rise and fall characteristics independent of load thereon
FUJITSU LTD32 citations92
US5966003AOct 12, 1999
DC-DC converter control circuit
FUJITSU LTD41 citations92
US6911806B2Jun 28, 2005
DC to DC converter producing output voltage exhibiting rise and fall characteristics independent of load thereon
FUJITSU LTD10 citations74
US7129682B2Oct 31, 2006
DC to DC converter producing output voltage exhibit rise and fall characteristics independent of load thereon
FUJITSU LTD1 citations63