An apparatus and method for selecting a ground capacitor that is connected between a ground of a circuit board included in a battery pack and a vehicle chassis. The apparatus includes a checking module configured to check a ground location on the circuit board; a selecting module configured to select a reference location on the circuit board, based on the ground location checked by the checking module; a calculating module configured to calculate a distance from the reference location selected by the selecting module to a nearest ground location as a reference distance; a computing module configured to compute a reference frequency by using the reference distance calculated by the calculating module; and a choosing module configured to choose a recommended capacitor, based on the reference frequency computed by the computing module.

A printed circuit board includes a front layer including frame ground regions on which connectors to be connected with external apparatuses or communication cables are mounted and which are connected with a ground, a signal ground region which is separated from the frame ground regions at the front layer, on which electronic devices configured to receive signals from the connectors are mounted, and which is connected with a ground, and a static electricity removal ground region separated from the frame ground regions and the signal ground region at the front layer, situated outside the frame ground regions, and connected with a ground.

A fastener structure includes a body portion and a fastening body. The body portion has a solderable layer, and the solderable layer is soldered to a plate body. The fastening body combines movably with the body portion. The fastening body has a head and a fastening portion. The body portion or the fastening body, or both the body portion and the fastening body is provided on the plate body for soldering after it is picked up by a tool so that the body portion can combine with the plate body. Also, the body portion or the fastening body, or both the body portion and the fastening body combines with a assisting pickup unit, and the fastener structure is provided on the plate body for soldering after it is picked up by a tool through the assisting pickup unit so that the body portion can combine with the plate body.

This switching power supply device having a plurality of power supply circuits to be connected to a multi-phase power supply, is provided with: a first substrate on which an electric component constituting a filter circuit is mounted, the output end of the filter circuit being provided on one end side in a first direction; a second substrate on which a power semiconductor constituting a circuit provided at a stage later than the filter circuit is mounted, the input end of the circuit provided at the stage later than the filter circuit being provided on one end side in a second direction that intersects with the first direction; and a third substrate which is disposed between the first substrate and the second substrate, and on which a wiring pattern for electrically connecting the output end to the input end is formed.

A disclosed intermediate circuit arrangement includes first and second partial circuit boards of identical design having a series circuit of at least two capacitor banks. The partial circuit boards each have a terminal strip having a positive intermediate circuit connection, a negative intermediate circuit connection, and a central connection. The circuit arrangement also includes a connecting circuit board for electrically connecting the respective connections of the terminal strips of the two partial circuit boards to one another. The connecting circuit board is a multi-layer circuit board with two outer metal layers and at least two inner metal layers arranged between the outer metal layers. The outer metal layers have an electric connection between corresponding connections of the terminal strips of the two partial circuit boards, and at least one first metal layer of the inner metal layers has only an electrical connection of the positive intermediate circuit connections of the two partial circuit boards and at least one second metal layer of the inner metal layers has only an electrical connection of the negative intermediate circuits of the two partial circuit boards. The intermediate circuit arrangement can be part of an inverter.

An electronic device includes a housing, first and second wiring substrates disposed to face each other, a fixing member that is made of an electrically conductive member and fixes the first and second wiring substrates to each other, and an external connection terminal provided in the housing. The fixing member has first and second fixing portions, and is interposed between the first and second wiring substrates. The fixing member is electrically conductive to a first electrically conductive portion provided in the first wiring substrate by fixing the first fixing portion to the first wiring substrate. The fixing member is electrically conductive to a second electrically conductive portion provided in the second wiring substrate by fixing the second fixing portion to the second wiring substrate. The external connection terminal is electrically conductive to the fixing member by electrically connecting the fixing member to the external connection terminal.

According to one embodiment, a wiring board unit includes a reinforcing board, a flexible printed circuit board includes a joint portion including a first plane and a second plane and attached on the reinforcing board, a relay unit extending from the first plane, a plurality of connection pad groups located on one of the first plane and the second plane and a first IC chip mounted on the first plane, and the joint portion is bent on a boundary between the first plane and the second plane.

A light-emitting module includes a first mounting board which has a first surface, a second surface opposite to the first surface, and a recess on the first surface. An opening passes through the first mounting board from a bottom surface of the recess to the second surface. A second mounting board has a mounting surface and a light-emitting element surface opposite to the mounting surface and is provided in the recess such that the light-emitting element surface faces the bottom surface of the recess. A light-emitting element is provided on the light-emitting element surface and configured to emit light through the opening. An elastic cushion is provided between the bottom surface and the light-emitting element surface. The second mounting board projects from the first surface of the first mounting board when a force pressing the second mounting board toward the bottom surface of the recess is not applied.

A fixing device for fixing a display card on a circuit board, includes a backplane and a support bracket. The backplane includes a substrate plate, and a first engaging part. The substrate plate is fixed on the display card. The first engaging part is disposed on the substrate plate. The support bracket includes at least one support leg and a second engaging part. The support leg includes a first end and a second end. The first end is connected with the circuit board. The second engaging part is connected with the second end and engaged with the first engaging part.

A connector includes a flexible connector having a first plurality of solder bumps arranged in a first pattern, and a base connector having a second plurality of solder bumps arranged in a second pattern concentric with and of a different size than the first pattern. A method of interconnecting a flexible connector to a base connector includes providing the flexible connector with a first plurality of solder bumps arranged in a first pattern, and providing the base connector with a second plurality of solder bumps arranged in a second pattern. The flexible and base connectors are aligned by aligning the first and second pluralities of solder bumps.