Abstract: In method for operating a magnetic resonance apparatus that has a gradient power amplifier that supplies a voltage to a gradient coil, and a gradient power amplifier control processor that provides control a control signal thereto that predetermines the aforementioned voltage, and a simulation computer that models an operational characteristic of each of the gradient coil the gradient power amplifier, an actual current value of a current fed into the gradient coil by the gradient power amplifier is measured and a target current value of the current fed into the gradient coil by the gradient power amplifier is determined by the simulation computer, using the control signal as an input variable. A fault signal is generated as a function of a determined deviation in the actual current value from the target current value.

Abstract: An arrangement to generate a basic magnetic field and a gradient magnetic field in a magnetic resonance tomography system include at least one basic electromagnet without an iron core that generates the basic magnetic field, at least three gradient field electromagnets that generate the gradient magnetic field, with the basic field electromagnet situated within the gradient field electromagnets such that during acquisition of magnetic resonance data from a subject, the basic field electromagnet is closer to the subject than the gradient field electromagnets. Because the basic electromagnet is situated within the gradient field electromagnets, an active shielding of the gradient field electromagnets can be foregone, and since the basic field electromagnet is situated near the subject, it can be a water-cooled air coil.

Abstract: In method for operating a magnetic resonance apparatus that has a gradient power amplifier that supplies a voltage to a gradient coil, and a gradient power amplifier control processor that provides control a control signal thereto that predetermines the aforementioned voltage, and a simulation computer that models an operational characteristic of each of the gradient coil the gradient power amplifier, an actual current value of a current fed into the gradient coil by the gradient power amplifier is measured and a target current value of the current fed into the gradient coil by the gradient power amplifier is determined by the simulation computer, using the control signal as an input variable. A fault signal is generated as a function of a determined deviation in the actual current value from the target current value.

Abstract: An inverter is proposed for providing an inverter output signal scalable in frequency. The inverter has a controller for controlling frequency of the inverter output signal according to a predefinable value. In order to generate a signal having a frequency value prescribed for the inverter output signal, the controller initiates a time delay of signals and superimposes the signals onto the signal having the frequency value prescribed for the inverter output signal. A low-complexity inverter concept for high voltages or high power is thus provided.

Abstract: An arrangement to generate a basic magnetic field and a gradient magnetic field in a magnetic resonance tomography system include at least one basic electromagnet without an iron core that generates the basic magnetic field, at least three gradient field electromagnets that generate the gradient magnetic field, with the basic field electromagnet situated within the gradient field electromagnets such that during acquisition of magnetic resonance data from a subject, the basic field electromagnet is closer to the subject than the gradient field electromagnets. Because the basic electromagnet is situated within the gradient field electromagnets, an active shielding of the gradient field electromagnets can be foregone, and since the basic field electromagnet is situated near the subject, it can be a water-cooled air coil.

Abstract: An inverter is proposed for providing an inverter output signal scalable in frequency. The inverter has a controller for controlling frequency of the inverter output signal according to a predefinable value. In order to generate a signal having a frequency value prescribed for the inverter output signal, the controller initiates a time delay of signals and superimposes the signals onto the signal having the frequency value prescribed for the inverter output signal.

Abstract: A connection system that couples a contact of a flat block of components to an apparatus is provided. The connection system comprises a conductive connecting element electrically coupled to the contact of the flat block of components, and a clamping device electrically coupled to the apparatus. The clamping device receives the connecting element. The connecting element is a rigid conductor. The rigid conductor is a screw fastened conductively to the contact. The screw penetrates a bore in the flat block of components and is locked by a nut on a second side of the flat block of components, which is opposite a first side of the flat block of components.

Abstract: A connection system that couples a contact of a flat block of components to an apparatus is provided. The connection system comprises a conductive connecting element electrically coupled to the contact of the flat block of components, and a clamping device electrically coupled to the apparatus. The clamping device receives the connecting element. The connecting element is a rigid conductor. The rigid conductor is a screw fastened conductively to the contact. The screw penetrates a bore in the flat block of components and is locked by a nut on a second side of the flat block of components, which is opposite a first side of the flat block of components.

Abstract: A capacitor module includes a first capacitor and a second capacitor, the first capacitor and the second capacitor each including a first electric terminal and a second electric terminal, a conductor to connect corresponding first electric terminals of the first capacitor and the second capacitor, and a connector to connect the conductor to corresponding second electric terminals of the first capacitor and the second capacitor.

Abstract: A housing for an electrochemical cell having at least a first electrode and a second electrode. The housing includes a lid having a first indentation to contact the first electrode, and a bottom having a second indentation to contact the second electrode. The first indentation has a first cross-section and the second indentation has a second cross-section. The first cross-section and the second cross-section get narrower as the first indentation and the second indentation progress into an interior of the housing.

Abstract: A transistor module formed on a substrate comprises a first transistor, a first recovery diode, a second transistor and a second recovery diode. A first transistor chip associated with the first transistor and a second diode chip associated with the second recovery diode are disposed adjacently on a positive potential area. The first transistor chip and the second diode chip are disposed on an output potential area. A second transistor chip associated with the second transistor and a first diode chip associated with the first recovery diode are adjacently disposed on the output potential area. At least two sides of the output potential area are adjacent to a negative potential area. Both the second transistor chip and the first diode chip are connected to the negative potential area, and one of the first and second transistor chips is disposed opposite one of the first and second diode chips located on a different potential area.

Abstract: A housing (1) having a lid (5), for electrochemical cells having at least two electrodes is proposed, wherein indentations (5B, 10B) for contacting the electrodes are present both in the lid and in the housing bottom. In this arrangement, the indentations demonstrate a cross-section that narrows into the interior of the housing, so that a particularly large, easily welded contact area between the indentations and the electrodes is the result.

Abstract: A gradient coil for use in magnetic resonance tomography is assembled from electrically conductive elements that each define a plane and that are arranged such that these planes lie parallel to one another. These elements are connected in a coil-forming fashion to electrically conductive spacers and in a stabilizing fashion to electrically insulating spacers.

Abstract: A transistor module formed on a substrate comprises a first transistor, a first recovery diode, a second transistor and a second recovery diode. A first transistor chip associated with the first transistor and a second diode chip associated with the second recovery diode are disposed adjacently on a positive potential area. The first transistor chip and the second diode chip are disposed on an output potential area. A second transistor chip associated with the second transistor and a first diode chip associated with the first recovery diode are adjacently disposed on the output potential area. At least two sides of the output potential area are adjacent to a negative potential area. Both the second transistor chip and the first diode chip are connected to the negative potential area, and one of the first and second transistor chips is disposed opposite one of the first and second diode chips located on a different potential area.

Abstract: A pot-shaped housing with a cover for capacitors has the pot-shaped housing and cover both being extruded as single workpieces and having different spatial dimensions along two principal axes so that they form either a rectangular or square. The cover is provided with two electrical terminals, preferably with one of the terminals being conducted through an opening in the cover and the other terminal preferably being integrally formed with the cover. The cover has a bent-up edge on its periphery in an interlocking fashion with the opening in the housing pot.

Abstract: A pot-shaped housing with a cover for capacitors has the pot-shaped housing and cover both being extruded as single workpieces and having different spatial dimensions along two principal axes so that they form either a rectangular or square. The cover is provided with two electrical terminals, preferably with one of the terminals being conducted through an opening in the cover and the other terminal preferably being integrally formed with the cover. The cover has a bent-up edge on its periphery in an interlocking fashion with the opening in the housing pot.

Abstract: A gradient coil for use in magnetic resonance tomography is assembled from electrically conductive elements that each define a plane and that are arranged such that these planes lie parallel to one another. These elements are connected in a coil-forming fashion to electrically conductive spacers and in a stabilizing fashion to electrically insulating spacers.

Abstract: A method for determining sources of interference that cause partial discharges in an encapsulated conductor structure of a magnetic resonance apparatus, particularly in a gradient coil. Under the method, a low-frequency high voltage is applied to a conductor, and signals resulting from an adjacent high voltage are measured within a frequency range located in the kHz range, particularly from 40 to 400 kHz. The signals are analyzed in order to determine partial discharges. The conductor is again charged with a low-frequency high voltage and additional signals are measured within a frequency range located in the MHz range, particularly from 10 to 300 MHz. The additional signals are analyzed in order to determine partial discharges.

Abstract: A method for determining sources of interference that cause partial discharges in an encapsulated conductor structure of a magnetic resonance apparatus, particularly in a gradient coil. Under the method, a low-frequency high voltage is applied to a conductor, and signals resulting from an adjacent high voltage are measured within a frequency range located in the kHz range, particularly from 40 to 400 kHz. The signals are analyzed in order to determine partial discharges. The conductor is again charged with a low-frequency high voltage and additional signals are measured within a frequency range located in the MHz range, particularly from 10 to 300 MHz. The additional signals are analyzed in order to determine partial discharges.

Abstract: A switching amplifier operable in a switched mode has a common-mode charging current which arises due to charge reversals in the conductor to ground and coupling capacitances. In order to make this charging current easily filterable, in a switching amplifier and a method for operating a switching amplifier, n successively connected cascade elements are provided n being odd and greater than equal to three, and a control unit drives comparable switch elements in the individual cascade elements so that these comparable switch elements are driven offset from cascade element-to-cascade element by 1/n times the switching period.