The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 19, 2011
Filed:
Jun. 30, 2006
Shingo Hishikawa, Kashiwa, JP;
Takuya Domoto, Noda, JP;
Shingo Hishikawa, Kashiwa, JP;
Takuya Domoto, Noda, JP;
Hitachi Medical Corporation, Tokyo, JP;
Abstract
A DC high voltage power source is constituted by an AC-DC converting means () that converts a voltage of a commercial AC power source () to a DC voltage and steps up the converted DC voltage, a DC-AC converting means () that converts the DC voltage stepped up by the previous means to an AC voltage, two insulating transformer () that steps up the AC voltage converted by the previous converting means while insulating each others and a series connection of DC voltages obtained after converting the output voltages from the transformers to DCs and smoothing the same. The DC voltage of the DC high voltage power source is used as the power source to current amplifiers () constituted by a multi level PWM inverter circuit () of 3 levels and the currents flowing through X axis, Y axis and Z axis gradient magnetic field coil () in an MRI apparatus connected to these current amplifiers as loads are controlled by a switching control device () so as to meet with current command values () from a sequencerin the MRI apparatus. As a result, plural DC high voltage power sources necessary for the multi level PWM inverter is constituted by a comparatively simple circuit, in addition, while suppressing loss in the power sources, a small sized and highly accurate high voltage and large current power source device and a magnetic resonance imaging apparatus using the same are provided.