Abstract: An electric booster includes a housing having one end including a coupling surface where the housing is coupled to a master cylinder, and the other end including an attachment surface where the housing is attached to a vehicle. A controller includes a flat plate-like control board, and the control board is disposed so as to be positioned between a first plane including the attachment surface of the housing where the housing is attached to the vehicle, and a second plane including the coupling surface of the housing where the housing is coupled to the master cylinder.

Abstract: An electric booster in which a rotation of an electric motor is converted into linear motion and transmitted to an output member by a rotation-linear motion mechanism. The output member pushes a piston of a master cylinder to generate brake fluid pressure in a pressure chamber in the master cylinder. An ECU casing containing boards is coupled to the top of a motor casing constituting the electric motor. The ECU casing is offset in one direction in a plane perpendicular to a plane containing an axis of the master cylinder. A male connector is provided at a side surface of the ECU casing on the opposite side from the offset direction side, and a space between the male connector and an interference area of the ECU casing is utilized as a space for attachment/detachment of the male connector.

Abstract: A voltage controller for an automotive alternator prevents a delay in response to an engine controller, thus enabling proper engine control to be accomplished. The voltage controller for an automotive alternator includes a switching means connected to an alternator, which is driven by an engine to charge a battery, so as to control supply and cutoff of exciting current supplied to a field coil of the alternator, and a conduction rate monitoring output terminal for monitoring the conduction rate of the field coil. The conduction rate monitoring output terminal outputs the conduction rate of the field coil in a steady mode wherein the output voltage of the alternator is a predetermined voltage or more, while it outputs an alternator voltage change signal in a transient mode wherein the output voltage of the alternator is below the predetermined voltage.

Abstract: A voltage controller for an automotive alternator prevents a delay in response to an engine controller, thus enabling proper engine control to be accomplished. The voltage controller for an automotive alternator includes a switching means connected to an alternator, which is driven by an engine to charge a battery, so as to control supply and cutoff of exciting current supplied to a field coil of the alternator, and a conduction rate monitoring output terminal for monitoring the conduction rate of the field coil. The conduction rate monitoring output terminal outputs the conduction rate of the field coil in a steady mode wherein the output voltage of the alternator is a predetermined voltage or more, while it outputs an alternator voltage change signal in a transient mode wherein the output voltage of the alternator is below the predetermined voltage.