公开(公告)号：US11561274B1

公开(公告)日：2023-01-24

申请号：US17929488

申请日：2022-09-02

Applicant: Bruker BioSpin GmbH

Inventor： Michael Maixner

IPC: G01R33/60

Abstract: A microwave bridge circuit routes a transmission signal from a transmitter to a resonator and forwards the reception signal generated in the resonator to a receiver. It includes two electrical lines connected in parallel at a first circuit point TX, where the transmission signal is divided. The first electrical line has an attenuator for attenuating a first transmission signal portion. The second electrical line carries a second transmission signal portion and connects to the resonator at a second circuit point R, which divides it between section L1, which runs from TX to R, and section L2, which runs from R to a third circuit point RX. The length of the sections L1 and L2 corresponds to an odd integer multiple of one quarter of the wavelength of the transmission signal, and the divided transmission signal portions are combined at RX, where the reception signal is forwarded to the receiver.

公开(公告)号：US11754600B1

公开(公告)日：2023-09-12

申请号：US18173102

申请日：2023-02-23

Applicant: Bruker BioSpin GmbH

Inventor： Michael Maixner

IPC: G01R19/32 ,  G01R19/25 ,  G01R15/04 ,  G01R1/20

CPC classification number: G01R19/32 ,  G01R1/203 ,  G01R15/04 ,  G01R19/2509

Abstract: A method for determining an electric current includes sending the electric current to be measured through a shunt arrangement that includes at least three identical resistors. The at least three identical resistors are thermally coupled to a common base plate and are electrically interconnected such that the electric current is at least partially divided such that a first local current through a first resistor is not equal to a second local current through a second resistor. The method also includes measuring, at the shunt arrangement, a first voltage and a second voltage via which the voltage dropping across a first resistor and across a second resistor are directly or indirectly determinable, and determining the electric current via the first voltage and the second voltage. A heating in the shunt arrangement generated by the electric current is at least partially taken into account in the determining the electric current.

公开(公告)号：US10429462B2

公开(公告)日：2019-10-01

申请号：US16050715

申请日：2018-07-31

Applicant: Bruker BioSpin GmbH

Inventor： Michael Maixner

IPC: G01R33/385 ,  G01R33/54 ,  G01R33/565

Abstract: A magnetic resonance (MR) device, having a gradient arrangement that includes a gradient coil (G) with an internal resistance (Rg), as well as an electric circuit for generating variable pulse-shaped currents through the gradient arrangement. The electric circuit has at least one low-voltage voltage source (V) for generating a voltage U≤100V, and a first circuit section in the electric circuit for current in the gradient coil in one direction and a second circuit section in the electric circuit for current in the gradient coil in a reverse direction to the first circuit section. This permits the generation of accurate square-wave current pulses, with a simultaneously short charging time of the auxiliary inductance.

公开(公告)号：US20190033406A1

公开(公告)日：2019-01-31

申请号：US16050715

申请日：2018-07-31

Applicant: Bruker BioSpin GmbH

Inventor： Michael Maixner

IPC: G01R33/385 ,  G01R33/54

CPC classification number: G01R33/3852 ,  G01R33/543 ,  G01R33/56572

Abstract: A magnetic resonance (MR) device, having a gradient arrangement that includes a gradient coil (G) with an internal resistance (Rg), as well as an electric circuit for generating variable pulse-shaped currents through the gradient arrangement. The electric circuit has at least one low-voltage voltage source (V) for generating a voltage U≤100V, and a first circuit section in the electric circuit for current in the gradient coil in one direction and a second circuit section in the electric circuit for current in the gradient coil in a reverse direction to the first circuit section. This permits the generation of accurate square-wave current pulses, with a simultaneously short charging time of the auxiliary inductance.