Abstract:
L'invention concerne un procédé de brasage d'un composant électronique, tel qu'un composant électronique de puissance, sur un circuit imprimé comprenant un trou de fluage comportant au moins les étapes suivantes : - Dépôt du composant électronique sur un emplacement du circuit imprimé comprenant ledit trou de fluage, et - Brasage sur le circuit imprimé du composant électronique en faisant fluer une pâte à braser en fusion dans le trou de fluage, de sorte qu'un orifice du trou de fluage est obturé par une protubérance de brasure.
Abstract:
A method of using coated and/or magnetic particles to deposit structures including solder joints, bumps, vias, bond rings, and the like. The particles may be coated with a solderable material. For. solder joints, after reflow the solder material may comprise unmelted particles in a matrix, thereby increasing the strength of the joint and decreasing the pitch of an array of joints. The particle and coating may form a higher melting point alloy, permitting multiple subsequent reflow steps. The particles and/or the coating may be magnetic. External magnetic fields may be applied during deposition to precisely control the particle loading and deposition location. Elements with incompatible electropotentials may thereby be electrodeposited in a single step. Using such fields permits the fill of high aspect ratio structures such as vias without requiring complete seed metallization of the structure. Also, a catalyst consisting of a magnetic particle coated with a catalytic material, optionally including an intermediate layer.
Abstract:
A package for power converters in which a multilayers circuit board holds the components. The winding of the magnetic elements are incorporated in the multilayers circuit board. The top and some portions of the bottom layers are also support for electronic components. Some of the components are placed on the top layer, which may not be utilized for magnetic winding, reducing the footprint of the magnetic core (26a). The power dissipating devices placed on pads which have a multitude of copper coated via connecting the top to bottom layers. Through these via the heat is transferred from the power devices to the other side of the PCB. In some of the embodiments of this invention the heat can be further transferred to a metal plate connected to the multilayers circuit board via a thermally conductive insulator. The base plate has cutouts or cavities to accomodate the magnetic cores. A thermally conductive material is placed between the magnetic core (26a) and the metal plate on the bottom of the cavity.
Abstract:
A transformer group in which a multitude of transformers (110A and 110B) are used to supply energy to a single load. The transformers (110A and 110B) are connected in series; in order to assist in providing a "flux equalizing" effect, the invention includes a flux equalizer circuit (112A and 112B). The flux equalizer circuit (112A and 112B) provides a series of flux windings. Each flux winding is associated with a single transformer. The windings are arranged in parallel. In this manner, a balancing of the output of the transformers is obtained; the power output from each transformer is "sensed" by its associated flux winding which is "shared" with the other transformers via their own associated flux winding. Power is processed then through the secondary windings, rectifiers, and output filters to a common load.
Abstract:
A semiconductor package with an improved solder joint reliability and a manufacturing method thereof are provided to enhance thermal and mechanical shock characteristics of the semiconductor package itself by using a solder connection part. A semiconductor package includes a PCB(Printed Circuit Board) on which a PSR(Photo Solder Resist) is coated, an adhesive member, a semiconductor chip and a solder connection part. The PCB includes a plurality of metal line layers(107) and a plurality of through holes. The adhesive member(104) is attached on an upper surface of the PCB. The semiconductor chip(102) is electrically connected with the metal line layers of the PCB. The semiconductor chip is mounted on the adhesive member. The solder connection part(110) is filled in the through hole.
Abstract:
A BGA package includes a semiconductor chip, and a PCB having a board body, a plurality of circuit patterns, a plurality of signal via holes, a solder resist, and a plurality of thermal emissive vias. The thermal emissive vias are holes located beneath a chip attach area, and these holes are filled with metal having a low melting point. The metal prevents moisture from being absorbed, while effectively transferring heat. The semiconductor chip is attached to the chip attach area of the PCB and is connected to circuit patterns of the PCB with bonding wires. The bonding wires and the semiconductor chip are encapsulated to protect them from external environmental stress. Solder bumps are formed on circuit patterns of the PCB. The BGA package has advantages in that it prevents moisture from penetrating to the chip through the thermal emissive vias, and effectively transfers the heat generated by the chip to the outside.
Abstract:
The present invention relates generally to electric circuit testing, building, or implementing using a breadboard style PCB. Aspects of the present invention include eliminating the need to use hookup wires when building and testing electric circuits on PCBs. In embodiments, a PCB system having rows and columns of signal tie points connected in a breadboard layout and using an embedded wire and a solder bridge to form partial connections between signal tie points. In embodiments, the embedded wire and solder bridge is capable of connecting a column of signal tie points. In embodiments, the embedded wire and solder bridge is capable of connecting a power rail to a signal tie point. Thus, a circuit can be implemented and tested by applying a small amount of solder to the solder bridge without the need for hookup wires.
Abstract:
Bei einem Verfahren zum Herstellen einer aus wenigstens zwei Leiterplattenbereichen (1, 2) bestehenden Leiterplatte, wobei die Leiterplattenbereiche (1, 2) jeweils wenigstens eine leitende Schicht (31), insbesondere strukturierte leitende Schicht und/oder wenigstens einen Bauteil (32) oder eine leitende Komponente beinhalten, wobei miteinander zu verbindende Leiterplattenbereiche (1, 2) im Bereich von jeweils wenigstens einer unmittelbar aneinander angrenzenden Seitenfläche (3) miteinander durch eine mechanische Kopplung bzw. Verbindung verbunden werden, ist vorgesehen, dass jeweils wenigstens ein Teilbereich oder Verbindungsanschluss der wenigstens einen leitenden Schicht (31) und/oder ein leitendes Element (33) des Bauteils (32) bzw. der Komponente der miteinander mechanisch verbundenen bzw. zu verbindenden Leiterplattenbereiche (1, 2) an der wenigstens einen aneinander angrenzenden Seitenfläche (3) elektrisch leitend miteinander verbunden bzw. gekoppelt werden, wodurch eine einfache und zuverlässige laterale elektrische Kopplung bzw. Verbindung zwischen miteinander zu verbindenden Leiterplattenbereichen (1, 2) möglich wird. Darüber hinaus wird eine derartige Leiterplatte zur Verfügung gestellt.
Abstract:
A test point of a circuit board is probed using an edge probe provided in a fixed orientation when the edge of the probe contacts a solder mound of the test point. The solder mound has an elongated shape. A length of the edge is substantially perpendicular to a length of the solder mound when the edge contacts the solder mound and is maintained in the fixed orientation.