Abstract:
To improve the stability and robustness of a rectifier and to protect it against atmospheric influences, two plate-like, series-connected semiconductor diodes are soldered to a common tap electrode between them. An external lead wire is soldered to each of the remaining sides of the diodes. The entire soldered structure is embedded in a single mass of resin or plastic, the ends of the electrodes being configured to serve as anchoring elements in the plastic mass.
Abstract:
To improve the stability and robustness of a rectifier and to protect it against atmospheric influences, two semiconductor diodes in the shape of small plates or discs are disposed to hold between them a center electrode. A wire-like lead electrode is held in contact with the remaining side of one diode and the second lead electrode is cup-shaped and its walls surround the diode stack. An inwardly extending lip of the cup-shaped electrode supports a spring which exerts pressure on the enlarged tip of the first lead electrode, thus clamping the entire stack in contact. A cover plate seals the opening of the cup and a resinous mass may be applied over the cover plate to provide a hermetic seal.
Abstract:
A semiconductor element, either a diode or a controlled rectifier, is electrically insulated relative to the heat sink on which it is mounted by either an insulating layer or an insulating diode of high thermal conductivity. A single unit including the heat sink with a plurality of diodes is used as a bridge rectifier in single phase or polyphase circuits.
Abstract:
An integrally housed bridge circuit including a plurality of high power semiconductor rectifiers. The rectifiers are disposed within a hermetically sealed insulative housing and are electrically interconnected therein to form a bridge circuit having a pair of A-C terminals and a pair of D-C terminals.
Abstract:
Two continuous lead strips are advanced longitudinally to receive a semiconductor element therebetween. The semiconductor element is attached to the strips, the semiconductor element is encapsulated, and the strips are segmented to form a semiconductor device. The strips may be fed in side by side or transverse relation. To form a bridge two strips are fed in side by side relation while two more strips are fed in transverse relation to the first two and in side by side relation to each other.
Abstract:
A plurality of rectifier bridges are made simultaneously by placing rectifier components on both sides at the end of comb leads. A T-shaped part is placed in contact with each pair of rectifiers on each side of the comb leads to complete the bridge. Each bridge is encapsulated and the comb leads are severed from the comb support.
Abstract:
A wafer is diffused along opposite surfaces with bands of alternating conductivity type so that a band on one major surface is aligned with a band of an opposite conductivity type on the opposite major surface. Grooves are formed to separate bands along one major surface while grooves are formed at substantially right angles on the opposite major surface. The wafer may then be sub-divided along the grooves to form integrated rectifier units formed of unitary semiconductive elements. Contacts associated with one major surface may be utilized to provide a thermally conductive path to a thermally conductive, electrically insulative surface of a substrate. The contacts and a passivant associated with the semiconductive element together encapsulate the semiconductive element.
Abstract:
An extruded aluminum heat sink for semiconductor rectifiers and having substantially identical right- and left-hand fin sections joined by an integral transverse horizontal web so that the heat sink is symmetrical about a vertical plane through the web. Each fin section has a relatively thick trunk portion that is tapered in thickness in a direction laterally outwardly from the web. A plurality of integral fins are disposed angularly to the trunk portion and project upwardly and downwardly therefrom so that the tips of the fins define a rectangular transverse configuration. Integral with each fin section adjacent the web is a mounting leg that projects downwardly and has an outwardly turned flange at its lower end for mounting the heat sink on a support such as a copper bus bar.