Denso Corporation

Koito Manufacturing Company, Ltd.

Toyota Jidosha Kabushiki Kaisha

Nippon Soken, Inc.

So-Ken Corporation

Kenji Tomita

Seiji Iyasu

Yuichi Handa

Kimikazu Nakamura

Yuji Hayashi

Tomohisa Kishigami

Yoshihisa Sato

Katutada Shirai

Yuuichi Handa

Katsutoyo Misawa

Masachika Kamiya

Ikuo Hayashi

Shinya Goto

Keiji Shigeoka

Toshihiro Wakamatsu

Norihito Kimura

Shigeyuki Soga

Kazunori Sakai

Hirofumi Kinjou

Yoshihiro Yamai

Ken Matsuoka

Masato Kume

Hiroshi Honda

Mikito Yagyu

Yosiaki Aiso

Kikuo Iguchi

A control apparatus performs peak current mode control in which a drive switch is turned off when output of a comparator is inverted during an on-operation period determined by a basic signal. The comparator inverts the output when a reactor current increases to a command current. The control apparatus determines that a switching frequency of the drive switch is required to be switched when the output of the comparator is detected to have not become inverted during the single switching period while the peak current mode control is being performed. The control apparatus sets the switching frequency to a first frequency when the switching determining unit determines that the switching frequency is not required to be switched, and switches the switching frequency from the first frequency to a second frequency lower than the first frequency when the switching determining unit determines that the switching frequency is required to be switched.

Control apparatus for power conversion apparatus

In a control device applied to an insulated DC-DC converter including a transformer and drive switches connected to a input winding of the transformer, the control device operates the drive switches to control an output voltage output via the output winding to a target voltage. Furthermore, the control device includes a voltage acquiring unit acquiring the output voltage and a frequency setting unit setting a switching frequency for the drive switches based on the output voltage acquired by the voltage acquiring unit. The frequency setting unit sets, for the switching frequency, a value increasing with a value of the acquired output voltage, and sets the switching frequency such that an increase in the value of the output voltage increases a frequency increase rate corresponding to an amount of increase in the switching frequency per unit amount of increase in the output voltage.

Control device for DC-DC converter

An apparatus for controlling a power converter includes a first converter configured to convert an AC voltage into a DC voltage by operations of an input side switch, a DC link capacitor charged with the DC voltage from the first converter, and a second converter configured to step down the DC voltage across the DC link capacitor by operations of one or more output side switches. In the apparatus, a lower limit calculator calculates a lower limit of the DC voltage across the DC link capacitor based on an output voltage of the second converter, a turns ratio of a transformer of the second converter, and a ratio of a turn-on period to one switching period for the one or more output side switches. A switch controller operates the input side switch to control the voltage across the DC link capacitor to a command voltage higher than the lower limit.

Apparatus for controlling power converter

A power conversion apparatus supplies power from a DC power supply to a capacitive load by a current input push-pull DCDC converter provided with switching elements Qand Q. When a capacitive load voltage is not larger than a second predetermined value, a first mode is used which turns ON one of the switching elements Qand Qalternated with turning OFF both. When the capacitive load voltage is larger than the second predetermined value but not larger than a first predetermined value, a second mode is used which turns ON both of the switching elements Qand Q, then turns ON one of them, then turns OFF both, sequentially. When the capacitive load voltage is larger than the first predetermined value, a third mode is used, turning ON both of the switching elements Qand Qalternated with turning ON one of them.

Power conversion apparatus and method for controlling power conversion apparatus

In a power converter, a feedback controller feedback controls a manipulated variable based on a first electrical parameter depending on input power and a feedback controlled variable determined for output power. A dead-time determiner determines a value of the dead time as a function of a boundary condition variable depending on at least one of the input power and the output power. The boundary condition represents a reference for determining whether the power converter is operating in a continuous conduction mode or a discontinuous conduction mode. The continuous conduction mode is designed for a current to be continuously flowing through an inductor included in the power converter or a load as an inductor current. The discontinuous conduction mode is designed for the inductor current to be discontinuously flowing through the inductor.

Power converter with dead-time control function

A DC-DC converter generates PWM signals PWMH, PWML on the basis of a reference signal CLKto drive switching elements connected in series. When generating a reset signal RST, the converter generates PWM signals PWMH, PWML on the basis of the reset signal RST. When generating no reset signal, the converter generates the PWM signals PWMH, PWML on the basis of a reference signal CLKin order to drive other switching elements connected in series. The converter generates the reset signal RST at an optional timing to the reference signal CLK. The reference signal CLKis brought forward from the reference signal CLKby &#x394;T. The PWM signals PWMH, PWML are different in timing from the PWM signals PWMH, PWML. This makes it possible to avoid the switching elements diagonally arranged from being simultaneously turned on and off, and suppress a switching loss, and to increase an efficiency of the converter.

Electric power conversion circuit

A vehicle lamp includes a reflector tiltably supported by an aiming mechanism intervening between the reflector and a lamp body. An aiming fulcrum forming the aiming mechanism is formed with a ball joint including a pivot on the reflector side and a bearing on the lamp body side. The pivot is formed with a shaft portion on the base end side and a ball portion on the front end side. The bearing is formed with a cylindrical ball bearing portion formed on the inner periphery where a ball supporting surface in press-contact with the ball portion opening forward via a ring-like diameter reducing portion. Vertical slits are provided in the open peripheral edge portion of the ball bearing portion. The ball portion is formed into a substantially hemispheric ball portion such that its front side press-fitted into the ball bearing portion has a spherical surface.

Vehicle lamp

A multiplex communication system having a data repeater, which can prevent data from being lost so as to improve reliability of data communication, when a data repeater of a multiplex communication system repeats data. A multiplex communication system is made up of a plurality of communication groups including a plurality of communication lines and a data repeater. The data repeater is made up of receiving buffers, sending buffers, a data controller and a transfer-address table. The data controller selects multiplex communication lines through which the received data is to be repeated and transfers the received data thereto. The data controller has a priority-reset means for increasing a priority of a received data before being sent. The priority-reset means prioritizes a sending of the data from the data repeater, even if the data sent from the data repeater collides with the other data on the multiplex communication lines through which the received data is to be repeated. In this way, the priority-reset means prevents the data waiting for being sent in the data repeater from being lost by being overwritten with newly received data.

Data repeater and multiplex communication system using the same

A vehicle lamp wherein a mounting member,A for mounting and fixing a lamp unit,onto a vehicle body is projected from the outer surface of a synthetic-resin lamp body,forming part of the lamp unit,. The mounting member,A is formed of synthetic-resin and incorporated into the lamp body,by welding. A material greater in strength than the lamp body,is used as the material of the mounting member,A to secure sufficient strength for the mounting member,A. The quantity H of projection of the mounting member,A from the outer surface of the lamp body,is made smaller than the quantity of projection of any conventional mounting member, so that the depth of a lamp chamber can be set greater.

Vehicle lamp and mounting member

An automobile lamp such as a license plate lamp having improved de-misting and waterproofing properties. The lamp includes a lamp housing, a lens, a gasket fitted between the housing and the lens, a member for conducting out the lead wires to the lamp socket, and a rubber cover crowning the lead conducting member and also serving as bushings for the leads. An air passageway communicates with the lamp chamber through the interiors of the bulb socket and the lead conducting member.

Automobile lamp

Growing community of inventors

Nisshin, Japan

Kenji Tomita