Inventor
KUMAGAI KEIZO
JP10 patents
⚠️ This page may combine multiple inventors who share the name “KUMAGAI KEIZO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
MITSUMI ELECTRIC CO LTD
5 patentsUS7372239B2May 13, 2008
Multi-output type DC/DC converter
MITSUMI ELECTRIC CO LTD25 citations92
US7378823B2May 27, 2008
Multi-output type DC/DC converter with a constant on time interval in a steady state
MITSUMI ELECTRIC CO LTD30 citations89
US7977890B2Jul 12, 2011
Direct current power supply device, power supply device for driving LED and semiconductor integrated circuit for controlling power supply
MITSUMI ELECTRIC CO LTD9 citations82
US7977889B2Jul 12, 2011
Direct-current power supply device, power supply device for driving LED and semiconductor integrated circuit for driving power supply
MITSUMI ELECTRIC CO LTD3 citations61
US7733070B2Jun 8, 2010
Multi-output type DC/DC converter
MITSUMI ELECTRIC CO LTD5 citations61
KUMAGAI KEIZO
4 patentsUS11387821B2Jul 12, 2022
Pulse signal sending circuit
KUMAGAI KEIZO2 citations70
US9048729B2Jun 2, 2015
Step-up/down DC-DC converter and switching control circuit
KUMAGAI KEIZO4 citations70
US8193793B2Jun 5, 2012
DC-DC converter
KUMAGAI KEIZO6 citations70
US8957650B2Feb 17, 2015
Step-up/down DC-DC converter and switching control circuit
KUMAGAI KEIZO0 citations39