Electrical transmission or interconnection systems – Plural load circuit systems – Transformer connections
Reexamination Certificate
2011-04-19
2011-04-19
Fureman, Jared J (Department: 2836)
Electrical transmission or interconnection systems
Plural load circuit systems
Transformer connections
Reexamination Certificate
active
07928600
ABSTRACT:
A DC high voltage power source is constituted by an AC-DC converting means (4, 6) that converts a voltage of a commercial AC power source (3) to a DC voltage and steps up the converted DC voltage, a DC-AC converting means (7) that converts the DC voltage stepped up by the previous means to an AC voltage, two insulating transformer (8, 9) 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 (19, 20, 21) constituted by a multi level PWM inverter circuit (18) of 3 levels and the currents flowing through X axis, Y axis and Z axis gradient magnetic field coil (15, 16, 17) in an MRI apparatus connected to these current amplifiers as loads are controlled by a switching control device (18q) so as to meet with current command values (22c1, 22c2, 22c3) from a sequencer22in 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.
REFERENCES:
patent: 63-92263 (1988-04-01), None
patent: 63-190556 (1988-08-01), None
patent: 2-184266 (1990-07-01), None
patent: 5-159893 (1993-06-01), None
patent: 7-65987 (1995-03-01), None
patent: 7-57094 (1995-06-01), None
patent: 7-313489 (1995-12-01), None
patent: 9-190898 (1997-07-01), None
patent: 2004-350471 (2004-12-01), None
Domoto Takuya
Hishikawa Shingo
Cooper & Dunham LLP
Fureman Jared J
Hitachi Medical Corporation
Parries Dru M
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