MAGNETIC RESONANCE IMAGING APPARATUS AND A POWER SOURCE SUPPLY SYSTEM THEREFOR

• US 20190331743A1
• Filed: 04/26/2019
• Published: 10/31/2019
• Est. Priority Date: 04/28/2018
• Status: Active Grant

• Current Assignee: Siemens Healthineers AG (Siemens AG)
• Original Assignee: Siemens Healthcare GMBH (Siemens AG)
• Inventors: Wu, Rui Ling, Yu, Hai Bo, Li, Zhi Bin
• Granted Patent: US 11,009,571 B2
• Time in Patent Office: Days
• CPC Class Codes: G01R 33/28 Details of apparatus provided for in groups G01R33/44 - G01R33/64
• CPC Class Codes: H02M 1/007 Plural converter units in cascade push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826
• CPC Class Codes: H02M 1/008 Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• CPC Class Codes: H02M 7/04 by static converters

Abstract

A power source supply system for a magnetic resonance imaging (MRI) apparatus that has multiple loads operating in a magnetic field environment, has an AC/DC conversion circuit that converts a supplied AC current to a first DC current having a predetermined first voltage, a branching element that supplies the first DC current in separate paths respectively to the multiple loads, a switching power source, disposed in each of the loads that converts the first DC current to a second DC current having a second voltage capable of being supplied to the load, with a switching frequency of the switching power source being set such that a positive integer frequency multiple thereof is offset from the Larmor frequency of the MRI apparatus.

Claims

1. A power source supply system for a magnetic resonance imaging apparatus that has multiple loads operating in a magnetic field environment, said power source supply system comprising:

an AC/DC conversion circuit that converts a supplied AC current to a first DC current having a predetermined first voltage;

a branching element that supplies the first DC current in separate paths respectively to the multiple loads;

a switching power source, disposed in each of the loads, that converts the first DC current to a second DC current having a second voltage capable of being supplied to the load; and

the switching power source having a switching frequency of that is set such that a positive integer frequency multiple thereof is offset from the Larmor frequency of the magnetic resonance imaging apparatus.

2. The power source supply system as claimed in claim 1, wherein the switching frequency of the switching power source is selected from 2.2 MHz-2.6 MHz or a positive integer frequency multiple thereof.

3. The power source supply system as claimed in claim 2, wherein the switching frequency of the switching power source is 2.5 MHz or a positive integer frequency multiple thereof.

4. The power source supply system as claimed in claim 1, wherein the AC/DC conversion circuit comprises an AC/DC converter and a filter.

5. The power source supply system as claimed in claim 1, comprising a transformer that converts AC power supplied from outside power source supply the system to AC power having a voltage capable of being supplied to the AC/DC conversion circuit.

6. The power source supply system as claimed in claim 1, wherein the branching element is selected from the group consisting of a Y-cable, a power strip, and a PCBA.

7. a magnetic resonance imaging apparatus comprising:

a magnetic resonance data acquisition scanner comprising multiple loads that operate in a magnetic field environment in order to acquire magnetic resonance data with said magnetic resonance data acquisition scanner operating at a Larmor frequency; and

a power source supply system comprising an AC/DC conversion circuit that converts a supplied AC current to a first DC current having a predetermined first voltage, a branching element that supplies the first DC current in separate paths respectively to the multiple loads, a switching power source, disposed in each of the loads, that converts the first DC current to a second DC current having a second voltage capable of being supplied to the load, and the switching power source having a switching frequency of that is set such that a positive integer frequency multiple thereof is offset from the magnetic resonance data acquisition scanner.