Patents by Inventor Martin Hergt

Martin Hergt 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).

  • Publication number: 20210297000
    Abstract: A DC-to-DC converter converts a DC input voltage to a DC output voltage by generating a primary AC voltage and transforming the primary AC voltage into a secondary AC voltage with a transformation ratio. The DC-to-DC converter has series resonance circuit for each AC voltage phase. When the ratio of the DC output voltage to the DC input direct voltage is greater than the transformation ratio, a phase shift between the primary alternating voltage and a series resonance circuit current corresponding to the primary alternating voltage is controlled to zero by changing a clocking frequency clocking the AC voltages. Conversely, when the ratio of the DC output voltage to the DC input voltage is less than the transformation ratio, the phase shift between the secondary AC voltage and a series resonance circuit current corresponding to the secondary AC voltage is controlled to zero by changing a clocking frequency.
    Type: Application
    Filed: July 15, 2019
    Publication date: September 23, 2021
    Applicant: Siemens Aktiengesellschaft
    Inventors: MARKUS ZOCHER, MARTIN HERGT
  • Patent number: 11122655
    Abstract: An electric arc furnace (1) operated with alternating current has a converter (2) which converts mains voltage (U), into primary voltage (U?) having a furnace frequency (f?). A furnace transformer (4) transforms the primary voltage (U?) into a secondary voltage (U?), supplied to electrodes (6) in a furnace vessel (8) (1). They apply electric arcs (10) to a melt material (9) in the vessel (8). The secondary voltage (U?) is also supplied to a capacitor assembly (7) on the output side of the furnace transformer (4) and the furnace transformer (4) is connected on the output side. A control device (5) controls the converter (2) such that a primary voltage (U?) output from the converter (2) to the furnace transformer (4) has a furnace frequency (f) of least ten times the mains frequency (f) and/or greater than 1 kHz.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: September 14, 2021
    Inventors: Björn Dittmer, Martin Hergt, Detlef Rieger
  • Publication number: 20200274452
    Abstract: A resonant DC-DC converter includes an inverter circuit, a rectifier circuit and a transformer unit. The inverter circuit is connected to a first terminal of the transformer unit, and the rectifier circuit is connected to a second terminal of the transformer unit. The first and second terminals are galvanically isolated from one another by a first transformer. The transformer unit is configured to adapt a transformation ratio of the transformer unit. The transformer unit has an energy transmission path which includes an inverter and a second transformer, with an input of the energy transmission path being arranged parallel to a primary side of the first transformer and an output of the energy transmission path being arranged in series with the secondary side of the first transformer.
    Type: Application
    Filed: August 22, 2018
    Publication date: August 27, 2020
    Applicant: Siemens Aktiengesellschaft
    Inventors: MARTIN HERGT, MARCEL LUTZE, SEBASTIAN NIELEBOCK, MARKUS PFEIFER, MARKUS ZOCHER
  • Patent number: 10716176
    Abstract: An apparatus for regulating an electric arc furnace connected to a power supply system with at least one system phase that applies an AC voltage to a furnace electrode and an arc current for melting. A control loop device includes an electrical converter designed for negative feedback of an amplitude and/or frequency of the AC voltage to produce an amplitude and/or frequency of the arc current. The converter includes an input port having a system power supply connected thereto, and an output port having a melting furnace power supply and a primary circuit of a first transformer connected thereto, wherein a secondary circuit of the first transformer is connected to the arc furnace electrode. A primary coil of a second transformer is connected in parallel with the converter input port, and a secondary coil of the first transformer is connected in series with a secondary coil of the second transformer.
    Type: Grant
    Filed: February 13, 2015
    Date of Patent: July 14, 2020
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Arno Doebbeler, Werner Hartmann, Martin Hergt, Juergen Rupp
  • Publication number: 20190254128
    Abstract: An electrical arrangement for an electric arc furnace (1) operated with alternating current has a converter (2) which converts mains voltage (U), having a mains frequency (f), of a supply grid (3) into primary voltage (U?) having a furnace frequency (f?). A furnace transformer (4) of the electrical arrangement transforms the primary voltage (U?) into a secondary voltage (U?). The secondary voltage (U?) is supplied to a number of electrodes (6) of the electric arc furnace (1). The electrodes (6) are arranged in a furnace vessel (8) of the electric arc furnace (1). They apply electric arcs (10) to a melt material (9) in the furnace vessel (8). The secondary voltage (U?) is also supplied to a capacitor assembly (7) which is on the output side of the furnace transformer (4) and to which the furnace transformer (4) is connected on the output side.
    Type: Application
    Filed: July 24, 2017
    Publication date: August 15, 2019
    Inventors: Björn DITTMER, Martin HERGT, Detlef RIEGER
  • Patent number: 9887690
    Abstract: A transformer including a coaxial transmission line and a series circuit of discrete stages of voltage sources arranged along a main axis of wave propagation. Electromagnetic waves are propagated along the coaxial transmission line in each stage and are coupled in the coaxial transmission line by pulse currents. Each stage has a coupling-in inductance formed by discrete inductances that generate the pulse currents. The discrete inductances are magnetically coupled to each other such that magnetic fluxes of the discrete inductances are superimposed on one another and added to one another along a circular line that is rotationally symmetrical to the main axis of wave propagation.
    Type: Grant
    Filed: February 7, 2014
    Date of Patent: February 6, 2018
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Werner Hartmann, Martin Hergt
  • Publication number: 20170150556
    Abstract: An electric arc furnace has a safety device (3) connected to an earthed peripheral device. An earth cable (4) is provided to the peripheral device of the arc furnace (2). An ammeter (6) measures the current across the earth cable (4). A circuit breaker (8) in the earth cable (4) has a tripping time of less than 100 ms.
    Type: Application
    Filed: July 14, 2015
    Publication date: May 25, 2017
    Applicant: Primetals Technologies Germany GmbH
    Inventors: Werner HARTMANN, Vico HAVERKAMP, Martin HERGT, Klaus KRÜGER, THomas MATSCHULLAT
  • Patent number: 9611836
    Abstract: The invention refers to a multilevel topology power converter (I) for electrical adaption of a low voltage alternating current (LVAC) of an electrical wind power generator (1) and a medium voltage (MV) transmission level for a transmission link to each other, the power converter (I) comprising for each phase: a switching unit (9) for adapting the low voltage (LV) and the medium voltage (MV) to each other, the switching unit (9) being controlled by a controller (15), whereby the controlled switching unit (9) separately switches n+1 terminal potentials along terminals of an electrical series of n>1 capacitors C1 . . . Cn (7); a current converter (5) for providing or using a direct current (DC) through the plurality of n>1 capacitors C1 . . . Cn (7) connected in series.
    Type: Grant
    Filed: November 26, 2014
    Date of Patent: April 4, 2017
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Divya Kurthakoti Chandrashekhara, Martin Hergt, Christian Schacherer
  • Publication number: 20170027027
    Abstract: An apparatus for regulating an electric arc furnace connected to a power supply system with at least one system phase that applies an AC voltage to a furnace electrode and an arc current for melting. A control loop device includes an electrical converter designed for negative feedback of an amplitude and/or frequency of the AC voltage to produce an amplitude and/or frequency of the arc current. The converter includes an input port having a system power supply connected thereto, and an output port having a melting furnace power supply and a primary circuit of a first transformer connected thereto, wherein a secondary circuit of the first transformer is connected to the arc furnace electrode. A primary coil of a second transformer is connected in parallel with the converter input port, and a secondary coil of the first transformer is connected in series with a secondary coil of the second transformer.
    Type: Application
    Filed: February 13, 2015
    Publication date: January 26, 2017
    Applicant: Siemens Aktiengesellschaft
    Inventors: Arno Doebbeler, Werner Hartmann, Martin Hergt, Juergen Rupp
  • Publication number: 20160273062
    Abstract: A method for operating an electric arc furnace (10) which has at least one electrode (18) having a through-opening (32). An electric arc (20) is generated between the at least one electrode (18) and a material to be melted (16). A first additive is introduced into the through-opening (32) of the electrode (18) for causing an endothermic chemical reaction which is controlled such that the chemical reaction is caused in a predetermined region (34) of the at least one electrode (18), wherein the region faces the material to be melted (16).
    Type: Application
    Filed: October 23, 2014
    Publication date: September 22, 2016
    Inventors: Manfred BALDAUF, Martin HERGT, Thomas MATSCHULLAT
  • Publication number: 20160226470
    Abstract: A transformer including a coaxial transmission line and a series circuit of discrete stages of voltage sources arranged along a main axis of wave propagation. Electromagnetic waves are propagated along the coaxial transmission line in each stage and are coupled in the coaxial transmission line by pulse currents. Each stage has a coupling-in inductance formed by discrete inductances that generate the pulse currents. The discrete inductances are magnetically coupled to each other such that magnetic fluxes of the discrete inductances are superimposed on one another and added to one another along a circular line that is rotationally symmetrical to the main axis of wave propagation.
    Type: Application
    Filed: February 7, 2014
    Publication date: August 4, 2016
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Werner HARTMANN, Martin HERGT
  • Publication number: 20160156339
    Abstract: The present invention relates to an apparatus for generating high-voltage pulses, in particular by means of an inductive coltage adder (IVA), wherein an inner conductor (1) of a coaxial transmission line (21) is in the form of a body which is rotationally symmetrical to a main axis (HA) of wave propogation and passes through all stages, the outer radius of said body being formed so as to decrease in size continuously from the first to the last stage with a constant pitch.
    Type: Application
    Filed: March 5, 2014
    Publication date: June 2, 2016
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Werner HARTMANN, Martin HERGT
  • Publication number: 20160149509
    Abstract: The invention relates to a Terminal (I) for electrical connection of an amount of electrical generators (1) to a high-voltage transmission network (3), the terminal (I) comprising connected in series in this order for each generator (1) assembly level (Li): a start AC/DC converter (5) for rectification of the generator voltage(s); a series resonant converter (7) for galvanic isolation between the generator (1) and the high-voltage; a converter unit (9) for providing the high-voltage.
    Type: Application
    Filed: November 21, 2014
    Publication date: May 26, 2016
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Martin HERGT, Divya KURTHAKOTI CHANDRASHEKHARA, Christian SCHACHERER
  • Publication number: 20160146192
    Abstract: The invention refers to a multilevel topology power converter (I) for electrical adaption of a low voltage alternating current (LVAC) of an electrical wind power generator (1) and a medium voltage (MV) transmission level for a transmission link to each other, the power converter (I) comprising for each phase: a switching unit (9) for adapting the low voltage (LV) and the medium voltage (MV) to each other, the switching unit (9) being controlled by a controller (15), whereby the controlled switching unit (9) separately switches n+1 terminal potentials along terminals of an electrical series of n>1 capacitors C1 . . . Cn (7); a current converter (5) for providing or using a direct current (DC) through the plurality of n>1 capacitors C1 . . . Cn (7) connected in series.
    Type: Application
    Filed: November 26, 2014
    Publication date: May 26, 2016
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Divya KURTHAKOTI CHANDRASHEKHARA, Martin HERGT, Christian SCHACHERER
  • Publication number: 20160056803
    Abstract: An apparatus and a method for generating high-voltage pulses using an inductive voltage adder, in which a first stage contains an electromagnetically coupling funnel-shaped intermediate piece positioned between a radial transmission line and a coaxial transmission line for transmitting electromagnetic waves from the radial transmission line into the coaxial transmission line.
    Type: Application
    Filed: April 8, 2014
    Publication date: February 25, 2016
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Werner HARTMANN, Martin HERGT
  • Patent number: 7606551
    Abstract: In a mixer circuit with a balanced frequency mixer with varactor diodes, a first input signal that exhibits a first input frequency can be fed to the frequency mixer via a first input. Furthermore, a second input signal that exhibits a second input frequency can be fed to the frequency mixer via a second input. The frequency mixer has at least two amplifier elements fashioned as varactor diodes. These amplifier elements mix the input signals with one another into a mix signal with a first signal component and a second signal component. The first signal component exhibits a first component frequency, the second signal component a second component frequency. The first component frequency is equal to the sum of the first and second input frequencies, the second component frequency is equal to the difference of the first and second input frequencies. An output signal that contains at least one of the signal components can be tapped via the output.
    Type: Grant
    Filed: March 1, 2007
    Date of Patent: October 20, 2009
    Assignee: Siemens Aktiengesellschaft
    Inventors: Jan Bollenbeck, Martin Hergt, Markus Vester
  • Patent number: 7598740
    Abstract: A radio-frequency coil arrangement has a number of conductor traces forming basic coils and with capacitors interconnected in the conductor traces. Conductor traces of various basic coils intersect at node points. At least one switching arrangement for selective, reversible connection of the conductor traces to form different coil geometries is provided at least some of the node points.
    Type: Grant
    Filed: November 21, 2007
    Date of Patent: October 6, 2009
    Assignee: Siemens Aktiengesellschaft
    Inventors: Hubertus Fischer, Oliver Heid, Martin Hergt
  • Patent number: 7518368
    Abstract: In a transmission device for use in magnetic resonance systems for transmitting magnetic resonance signals from a number of local coils to an evaluation device, the signals are transmitted as optical signals in an optical conductor between a first transmitter-side transducer that transduces electrical signals into optical signals and a second receiver-side transducer that transduces optical signals into electrical signals, and an analog/digital converter is respectively provided between the local coils and the first, transmitter-side transducer. The local coils are connected by electronic elements to a single circuit board, and a number of preamplifiers, the analog/digital converters and a multiplexer are integrated onto the circuit board such that the multiplexer merges the outputs of the multiple analog/digital converters.
    Type: Grant
    Filed: January 15, 2008
    Date of Patent: April 14, 2009
    Assignee: Siemens Aktiengesellschaft
    Inventors: Mario Festag, Martin Hergt, Markus Vester
  • Patent number: 7518373
    Abstract: A magnetic resonance system that has a magnet system that generates magnetic fields in an excitation region, allowing nuclei in an examination subject in the excitation region to be excited to emit a magnetic resonance signal. A reception antenna device with multiple local coils for reception of the magnetic resonance signals is arranged in proximity to the examination subject, and has a base part and an attachment part. The attachment part can be placed on the base part such that the examination subject is located between the base part and the attachment part (6). The multiple local coils are respectively connected with an evaluation device for evaluation of magnetic resonance signals.
    Type: Grant
    Filed: October 26, 2007
    Date of Patent: April 14, 2009
    Assignee: Siemens Aktiengesellschaft
    Inventors: Hubertus Fischer, Martin Hergt, Thomas Kundner
  • Patent number: 7486077
    Abstract: A magnetic resonance system has a base unit and a patient bed. The base unit embodies a magnet system by which magnetic fields can be generated in an excitation region, these magnetic fields causing nuclear spins in an examination subject in the excitation region to be excited to emit a magnetic resonance signal. The patient bed can be moved in a travel direction relative to the base body over a travel range. By movement of the patient bed the examination subject can be brought into the excitation region. A number of base unit coupling elements that are connected with an evaluation device for evaluation of magnetic resonance signals are arranged to be stationary at the base unit relative to the base unit. A number of patient bed coupling elements that are connected with a local coil for acquisition of the magnetic resonance signal are arranged on the patient bed so as to be stationary relative to the patient bed.
    Type: Grant
    Filed: December 11, 2007
    Date of Patent: February 3, 2009
    Assignee: Siemens Aktiengesellschaft
    Inventors: Martin Hergt, Thomas Kundner