Abstract: Method for operating a converter circuit with voltage boosting with N half-bridges, which in each case can be connected by their center connection to a phase of an N-phase generator and at an end side are connected in parallel with a series circuit formed by two capacitances, wherein each half-bridge contains a Top switch and a Bot switch, in which, in a PWM method with a fixed period duration at the beginning of the period duration, all the TOP switches are simultaneously switched on for the duration of a TOP switched-on interval. After half the period duration all the BOT switches are simultaneously switched on for the duration of a BOT switched-on interval wherein the TOP switched-on interval, and the BOT switched-on interval amount at most to half the duration of the period.

Abstract: A power semiconductor module having a housing, a pressure member, a substrate including at least one contact surface, and at least one connection element leading towards the exterior of the housing. The connection element has a first contact device, a resilient section and a second contact device. The pressure member has two stop elements. The first contact device is electrically conductively connected to the contact surfaces of the substrate. The second contact device is arcuate in shape and has at least one deformation at the beginning and at the end of the arc, wherein, as a result of the deformations of the second contact device co-operating with the two stop elements of the pressure member, the connection element is prestressed.

Abstract: An isolating device for a power semiconductor comprising n power terminals for a power grid comprises n module terminals, n grid terminals, n connecting lines which connect the module terminals and grid terminals and have overcurrent fuses, and a tripping controller. The tripping controller includes a detector for detecting the rupture of an overcurrent fuse and a tripping unit for tripping an overcurrent fuse. A power module contains a power semiconductor and an isolating device. A system installation contains at least two power modules connected in parallel. In a method for operating an isolating device, at least one of the overcurrent fuses is tripped upon a predetermined tripping criterion being met.

Abstract: A power semiconductor component having a basic body and at least one contact area. At least one first thin metallic layer of a first material is arranged on the contact area. A second metallic layer—thicker than the first—of a second material is arranged on the first material by a pressure sintering connection of said material. The associated method has the following steps: producing a plurality of power semiconductor components in a wafer; applying at least one first thin metallic layer on at least one contact area of a respective power semiconductor component; arranging a pasty layer, composed of the second material and a solvent, on at least one of the first metallic layers for each power semiconductor component; pressurizing the pasty layer; and singulating the semiconductor components.

Abstract: A power semiconductor module comprising a housing of a first plastic, at least one substrate carrier with a circuit constructed thereon and electric terminating elements extending therefrom. The housing includes attachment means for its permanent connection with the substrate carrier. The housing has a permanently elastic sealing device of a second plastic which is formed integrally with the housing and encircles and is directed towards a first inner main surface of the substrate carrier. A method for constructing such a module includes the steps of constructing a housing of a first mechanically stable plastic and a sealing device of a second permanently elastic plastic; disposing the at least one substrate carrier on the housing; and permanently connecting the housing to the substrate carrier.

Abstract: A frequency converter circuit for a double-fed asynchronous generator with a variable power output, which can be connected to a voltage network contains a rotor rectifier, which can be connected to the rotor of the asynchronous generator, a network frequency converter, which can be connected to the voltage network, and an intermediate circuit. The intermediate circuit contains a semiconductor switch arranged on the rotor rectifier, an intermediate circuit capacitor arranged on the network frequency converter, and a diode arranged between the semiconductor switch and the intermediate circuit capacitor. According to a method for operating such a frequency converter circuit, the semiconductor switch is kept closed during the sub-synchronous operation of the asynchronous generator, and during at least some periods of synchronous or super-synchronous operation of the asynchronous generator the semiconductor switch is opened.

Abstract: A display device has two interlocked contrasting elements. A display element includes indicia and a first locking member. The background element includes a second locking member complementarily shaped to conform to the shape of the first locking member. The first locking member has two portions. The first portion is a waffle plate which tapers from top to bottom. The second portion includes a plurality of frusto-conical pads disposed beneath nodes of the waffle plate of the second portion.

Abstract: A needle protective assembly includes a ratchet and pawl arrangement for permitting the unidirectional movement of a protective sleeve along a body of a dispenser, such as a hypodermic syringe. The sleeve is adapted to cover a standard Y-site diaphragm, and includes a lock to secure the sleeve to the Y-site while in use. The assembly may also include indicia on the exterior thereof to measure the amount of needle exposed beyond the end of the sleeve, if the sleeve is not in its fully extended position. The assembly may further include a luer lock, for attaching the assembly to pre-existing standardized fittings.

Abstract: A fluid dispenser includes a resilient housing having opposing walls. A conduit leads from the interior of the housing to its exterior, and may be used to conduct the fluid from the interior of the housing to its desired end location. A serrated member is affixed to the interior of one of the opposing walls, and a pin is affixed to the other wall. When pressure is exerted on the opposing walls, the pin slides along the serrations of the serrated member, causing an interruption of the continuous pressure exerted on the walls, thereby causing the fluid to be delivered in a pulsed stream.

Abstract: Briefly stated, the invention is directed to a method for the diagnosis of a malady in a subject by the observing of a degree of reaction between the leukocytes in the subject's blood with a foreign entity having a predetermined relationship with the malady being diagnosed.

Abstract: A swimming pool cover support system for maintaining the cleanliness of a pool during periods the pool is not in use includes at least one central support member, and a plurality of support arms. The top of the support member is positioned at a height greater than the distance from the bottom of the pool, at the location of the support member, to a height over the highest point on the side of the pool. Each of the plurality of support arms is attached at one end thereof to the top of the central support member, and at the other end thereof contacts a side of the pool. The other end of each support arm is secured to the side of the pool by means of a side brace affixed to the side of the pool. A cover is disposed over the central support member and support arms, and suspended thereby over the surface of the pool.

Abstract: A display device has two interlocked contrasting elements. A first element is of a first color, and has a top surface configured to resemble desired indicia, e.g. one or more letters or numerals. The first element also has a bottom surface which includes a plurality of first locking members. A second element has a plurality of second locking members which interlock with the first locking members, and is of a second color. The second color preferably contrasts with the first color. The interlocking action of the first locking members with the second locking members serves to interlock the two contrasting elements, thereby providing a good mechanical locking action therebetween. In a first embodiment, the first and second elements together form a generally flat top surface, while in a second embodiment, the two elements are of different top levels, so that the indicia may be either raised or recessed with respect to the background.

Abstract: The invention is directed to disposable dispensing apparatus having a generally triangular body, for dispensing a material therefrom. A stop is disposed within the body, and has a variable thickness. The stop is positioned so that a user of the apparatus may squeeze opposing sides of the body at varying points to dispense varying amounts of the material. Preferably, indicia, such as frets, are disposed on the exterior of the body, to advise the user of the amount of material dispensed by squeezing the body at varying points along the stop. In a preferred embodiment, the body includes a one-way valve for permitting the influx of ambient air into the body after the dispensing of material therefrom, thereby maintaining the volume within the body at a relatively constant level. In a second preferred embodiment, the apparatus further includes a removable nozzle for locating a precise location into which the material is deposited upon exiting the apparatus.

Abstract: The invention is directed to a method for the diagnosis of a malady in a subject by observing a degree of reaction between all blood cells: red blood cells, leukocytes and platelets; in the subject's blood with a foreign entity having a predetermined relationship with the malady being diagnosed. The test includes comparing amounts and sizes of red blood cells, leukocytes and/or platelets in a control sample and at least one test sample. The test sample includes a portion of the subject's blood and the foreign entity being tested.

Abstract: Method and apparatus for the objective determination of the degree of reaction between a suspected allergen and a blood sample, by comparing the number and/or size-distribution of white blood cells present in the blood sample before and after reaction thereof with the suspected allergen.

Abstract: A toothbrush container assembly for use with a toothbrush and for mounting in a wall including a base having a first aperture therein, a slot adjacent said first aperture, an interior reservoir, a second aperture leading from the reservoir to the exterior of the base, the second aperture including a first fastener and means for securing the base to the wall, and a toothbrush container assembly having a cap including a second fastener; a central housing including first and second ends, a third fastener disposed at the first end and adapted to removably engage the second fastener, a fourth fastener disposed at the second end of the housing and adapted to removably engage said first fastener; and engaging hook disposed intermediate the first and second ends and adapted to removably engage the slot; an interior shoulder to support the toothbrush while within the container; a first, perforated, bottom member having a fifth fastener adapted to removably engage the fourth fastener; and a second, imperforate, bottom