Patents by Inventor Winfried Schierz
Winfried Schierz has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5060048Abstract: A discretely constructed MOSFET is switched by a voltage applied between gate terminal and source terminal. The source terminal has a self-inductance in which a fast change of the load current induces a considerable voltage which opposes the applied gate-source bias. This opposing voltage is reduced since the source contact is connected to an auxiliary terminal which is largely magnetically decoupled from the source terminal. A control voltage is applied between gate terminal and auxiliary terminal. When a plurality of MOSFETs are connected in parallel, oscillations in the control circuit can thus be effectively suppressed.Type: GrantFiled: May 4, 1990Date of Patent: October 22, 1991Assignee: Siemens Aktiengesellschaft & Semikron GmbHInventors: Ernst Hebenstreit, Leo Lorenz, Winfried Schierz, Heinz Amann
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Patent number: 4734755Abstract: A semiconductor device element, switchable and stable against alternating loads, is provided as an intermediate product which can be stored, can be applied universally, has a semiconductor wafer disposed between two annular insulating bodies and is stabilized on its surface. The semiconductor wafer is connected on two sides via soldering to a contact piece of molybdenum. The contact pieces are provided on their outer surface in each case with a metallization for providing pressure contacting. The semiconductor wafer is covered with a protecting, that is, passivating and stabilizing, covering in the edge zone up to the jacket face of the contact pieces. The edge zone of the semiconductor is immersed in an additional surface stabilizing material in the edge zone between the insulating bodies. The adhesive properties of the surface stabilizing substance mutually connect the insulating bodies and the semiconductor wafer.Type: GrantFiled: June 7, 1985Date of Patent: March 29, 1988Assignee: Semikron Gesellschaft fur GleichrichterbauInventor: Winfried Schierz
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Patent number: 4672422Abstract: A semiconductor rectifier unit composed of at least two rectifier elements, late-shaped contact elements contacting each rectifier element, components producing spring pressure for clamping the rectifier elements between the contact elements, and a carrier body supporting the rectifier elements, contact elements and clamping components. Each rectifier element is composed of a semiconductor body having contact electrodes on opposite surfaces thereof and two contact members contacting the electrodes and forming a separable stack with the semiconductor body. A body of insulating material surrounds each rectifier element and is interposed between the contact elements to define therewith an enclosure for each rectifier element, and sealing rings form a sealed joint between the body of insulating material and each contact element for sealing the enclosure for each rectifier element.Type: GrantFiled: September 24, 1985Date of Patent: June 9, 1987Assignee: SEMIKRON Gesellschaft fur Gleichrichterbau und Elektronik m.b.H.Inventor: Winfried Schierz
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Patent number: 4499485Abstract: In a semiconductor unit composed of at least two semiconductor members each rovided at each end with a respective current contact, a housing including a metallic base plate and a cover, elements for mounting the semiconductor members in electrically insulated and thermally conductive communication with the base plate, external connecting leads, and spring elements for establishing pressure contact between the leads and the current contacts, the connecting leads include a lower lead in the form of a contact rail contacting the current contact at that end of each member which is directed toward the base plate and interposed between the base plate and the members, and an upper lead for each member arranged concentrically with its respective member and contacting the current contact at that end of its associated member which is directed toward the cover, the contact rail includes a free end region which extends through an opening in the housing to provide an external connection in a selected connection plane, theType: GrantFiled: October 20, 1983Date of Patent: February 12, 1985Assignee: SEMIKRON Gesellschaft fur Gleichrichterbau und Elektronik mbHInventors: Winfried Schierz, Helmut Creutz
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Patent number: 4209799Abstract: In order to efficiently dissipate heat from both sides of a semiconductor vice to an associated cooling element, the device is contacted at its two load current conducting sides by conductive contacting elements and the contacting elements are both firmly connected to the cooling element in a thermally conductive and electrically insulating manner.Type: GrantFiled: August 24, 1977Date of Patent: June 24, 1980Assignee: Semikron Gesellschaft fur Gleichrichterbau und Elektronik m.b.H.Inventors: Winfried Schierz, Claus Butenschon
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Patent number: 4106052Abstract: An improved semiconductor rectifier unit of the type in which two semicontor rectifier devices are electrically insulated and thermally conductively arranged in an electrical series connection so that a current conducting lead associated with the input and a current conducting lead associated with the output of the series connection as well as a third current conducting lead associated with the connecting conductor between the semiconductor devices are arranged in a row and each one of the two outer current conducting leads together with its associated semiconductor device are firmly mounted on a respective common contact plate which is fastened on the base plate via a wafer of electrically insulating thermally conductive material and in which the semiconductor devices have their contacting and connecting members accommodated in a housing including the base plate and a hollow plastic member fastened to the base plate.Type: GrantFiled: September 1, 1977Date of Patent: August 8, 1978Assignee: Semikron Gesellschaft fur Gleichrichterbau und Elektronik m.b.H.Inventor: Winfried Schierz
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Patent number: 4079410Abstract: An improved semiconductor rectifier arrangement of the type in which two ncapsulated rectifier elements, each having at least one pn-junction, are each fastened, via respective metal contact discs and in a manner that insulates the rectifier elements electrically and provides good heat conductance, on a common cooling member provided with coolant passages in which each rectifier element is connected at its upper connecting terminal to another rectifier element via a current conductor fastened on the contact disc associated with the other rectifier element to form an antiparallel circuit, and in which the structure comprising the cooling member, the rectifier elements and the current conductors is embedded in an insulating mass. Each contact disc bearing a rectifier element is provided with a connecting member for connecting the rectifier arrangement with current conductors, and is fastened to a suitably metallized surface section of a wafer made of a thermally good conducting electrical insulating material.Type: GrantFiled: November 24, 1976Date of Patent: March 14, 1978Assignee: Semikron Gesellschaft fur Gleichrichterbau und Elektronik m.b.H.Inventor: Winfried Schierz
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Patent number: 4047197Abstract: A semiconductor rectifier arrangement in which two semiconductor rectifier evices which each have at least one pn junction are fastened with their connecting components to one side of a common metallic base plate in an electrically isolated but thermally conducting manner, are connected into an electrical series circuit to form a structural unit and are disposed in a housing. In addition to the two current conducting terminals associated with the input and output of the series circuit, a third current conducting terminal is provided which is connected with the conductor connecting the two semiconductor rectifier wafers in series. The three current conducting terminals are arranged in a row with the third terminal associated with the connecting conductor preferably being disposed at one end of the row.Type: GrantFiled: April 16, 1976Date of Patent: September 6, 1977Assignee: SEMIKRON Gesellschaft fur Gleichrichterbau und Elektronik m.b.H.Inventor: Winfried Schierz