Switching type power source device and magneto-resonance imaging device using the same

A switching power supply, magnetic resonance imaging technology, applied in the direction of application, electrical components, measuring magnetic variables, etc., can solve problems such as hindering MRI images, current pulsation, and reducing coil current accuracy

Inactive Publication Date: 2006-03-08
HITACHI MEDICAL CORP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Although current power supply equipment for MRI equipment needs boosted voltage and enhanced current for high-speed imaging, even if the above-mentioned multi-level PWM inverter is used for a switching power supply, current ripples still occur during switching operations, thereby Reduced accuracy of the current supplied to the magnetic field generating coil operating as a load, which prevents high-quality MRI images from being obtained

Method used

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  • Switching type power source device and magneto-resonance imaging device using the same
  • Switching type power source device and magneto-resonance imaging device using the same
  • Switching type power source device and magneto-resonance imaging device using the same

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Embodiment Construction

[0011] Embodiments of the present invention are now explained with reference to the drawings.

[0012] figure 1 Shown is a structural block diagram when a switching power supply device according to an embodiment of the present invention is applied to a gradient magnetic field coil of an MRI device.

[0013] The gradient magnetic field coil power supply device 2 for MRI equipment is configured to be powered from a three-phase AC power supply 3 and connected to the gradient magnetic field coil 1 operating as a load to supply current thereto. A power supply device 2 for a gradient magnetic field coil used in MRI equipment is provided with an AC / DC converter 4 connected to a three-phase AC power supply 3 and capable of converting three-phase AC voltage into a DC voltage, connected to the AC / DC converter 4 The smoothing capacitor 5 of the output terminal and smoothing DC voltage and the starter connected to the smoothing capacitor 5 to receive the smoothing DC voltage and provide ...

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Abstract

A switching type power source device used for magnetic field generation coils for an MRI device in which a switching power sources ( 9-11 ) are constituted by a first and a second multi level PWM inverter ( 12,13 ) having a same number of potential levels connected in parallel each other with respect to magnetic field generating coils ( 6-8 ) for the MRI device working as a load as well as a switching control circuit ( 19 ) for drive controlling the first and the second multi level PWM inverter ( 12,13 ) is constituted to drive control the first and the second multi level PWM inverter ( 12,13 ) in a manner to shift the switching phases thereof each other, thereby, ripple components in currents output from the first and the second multi level PWM inverter ( 12,13 ) are canceled out each other and a current with a further reduced ripple components as a whole can be supplied to the load ( 6-8 ).

Description

technical field [0001] The present invention relates to switching power supply equipment suitable for coils for magnetic field generation, that is, for magnetic resonance imaging equipment (hereinafter referred to as MRI equipment), a coil for generating a gradient magnetic field or a high-frequency magnetic field, and an MRI equipment using it. Background technique [0002] Switching power supplies have been widely used as power supply equipment for MRI equipment. Recently, in order to meet the demand for increased current, power supply equipment for coils for magnetic field generation in MRI equipment is constructed by connecting two stages of PWM inverters in parallel, as in JP-A -8-211139 as disclosed. Also, in the field of inverter power supplies for driving three-phase motors, multilevel inverter technology is used to boost voltage and boost current and measure higher harmonic components in the opposite direction, as in Jose Rodriguez et al. "Multilevel Inverters: A ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/055G01R33/385H02M7/00H02M7/48H02M7/483H02M7/5387
CPCH02M2003/1555H02M7/493G01R33/3852H02M7/487H02M3/1555H02M1/0043
Inventor 堂本拓也高野博司
Owner HITACHI MEDICAL CORP
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