K
Koichi Toyama
Researcher at Denso
Publications - 39
Citations - 309
Koichi Toyama is an academic researcher from Denso. The author has contributed to research in topics: Gas-discharge lamp & Voltage. The author has an hindex of 11, co-authored 39 publications receiving 309 citations. Previous affiliations of Koichi Toyama include Fujitsu & Toyota Boshoku.
Papers
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Patent
Discharge lamp device
Koichi Toyama,Hironao Yamaguchi +1 more
TL;DR: In this article, a discharge lamp device to reduce noise radiation and to reduce a surge pulse current resulting from a shield sheath involves providing a ballast, including a DC/DC conversion circuit for boosting a direct current voltage from a battery, an inverter circuit for converting the voltage boosted by the DC and DC conversion circuit into an alternating current voltage, a starting circuit having a second transformer for boosting to such a voltage that causes a breakdown between electrodes of a lamp in starting up the lamp.
Patent
Control apparatus for a lighting system of a discharge lamp used in various types of vehicles
TL;DR: In this paper, an electric power of a DC/DC converter is controlled by lamp power calculating circuit 36 and DC-DC converter drive circuit 37 based on the lamp current detected by lamp current detecting resistance 35 and the lamp voltage detecting resistances 33 and 34, which is connected at a connecting point "a" which is grounded.
Patent
Anti-skid system for a vehicle
TL;DR: In this paper, an improved anti-skid system for a vehicle which effectively utilizes an approximated slip ratio between vehicle or body velocity and wheel velocity to generate a brake release signal for the brake release valve but without actually utilizing a vehicle and body velocity detector is presented.
Patent
Power supply circuit
TL;DR: In this article, a switch is opened to provide a resistor in the preceeding stage of the inductor of a power supply circuit to limit an in-rush current at the time of charging a capacitor effectively.
Patent
Discharge lamp apparatus having directly coupled lamp and electronic controller
Hironao Yamaguchi,Koichi Toyama +1 more
TL;DR: In this article, a casing of an electronic controller unit for a discharge lamp is comprised of a resin casing and a metal casing and accommodates therein circuit components for generating a voltage supplied to the discharge lamp.