Patent ID: 11959983
Assignee: SIEMENS HEALTHINEERS AG
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A body coil tuning control device, comprising:
a DC-DC converter, a first low dropout linear regulator (LDO), a first resistor group having one resistor or multiple series resistors, a first operational amplifier, a negative feedback circuit, and a metal-oxide semiconductor field effect transistor (MOSFET) array, wherein:
said DC-DC converter has an input terminal connected to a DC power supply of a magnetic resonance imaging (MRI) system and an output terminal connected to an input terminal of said first LDO, and said DC-DC converter is configured to reduce a voltage of an input DC signal to a preset first voltage;
said first LDO has an output terminal connected to a first connection terminal of said first resistor group, and an output voltage of said first LDO is smaller than the preset first voltage;
said first operational amplifier has an inverting input terminal connected to the first connection terminal of said first resistor group and a non-inverting input terminal connected to a second connection terminal of said first resistor group;
said first operational amplifier has an output terminal connected to a gate of said MOSFET array;
said negative feedback circuit is connected between the output terminal of the operational amplifier and the inverting input terminal of said first operational amplifier;
said MOSFET array has a drain connected to the second connection terminal of said first resistor group, and a source connected to the input terminal of the body coil of said MRI system;
said negative feedback circuit meets the following requirement: after an output signal of said first operational amplifier is input to the gate of said MOSFET array, the source of said MOSFET array outputs a constant preset current; and
each MOSFET in said MOSFET array is connected in parallel, and a number of MOSFETs meets a requirement that a power of each MOSFET is smaller than a preset power.