Hitachi Medical Corporation

Hitachi, Ltd.

Shingo Hishikawa

Kaoru Yamamoto

Takuya Domoto

Masakazu Okabe

Provided is a mobile X-ray apparatus that is capable of safely charging multiple mobile X-ray apparatuses. A power supply deviceincludes a plugan electrical outleta batterya control unita current detectorand a power supply circuitThe power supply circuitincludes a power limiting circuitan external output circuitand a charging circuitThe power limiting circuitlimits power together with the control unitIn the power supply circuiti) if an external output circuitside is current-limited, charging is preferentially performed, and ii) if the charging circuitside is current-limited, power is output preferentially to external equipment. In the power supply circuitthe current of one current path is limited, and a large amount of current is allowed to flow preferentially in the other current path.

Mobile X-ray apparatus and method for charging mobile X-ray apparatus

In order to provide an X-ray imaging apparatus including a two-phase anode rotation mechanism driving circuit having a small and light configuration, one end of the main stator coil is connected to a three-phase full-bridge inverter circuit and the midpoint between two semiconductor switches of the first arm, one end of the auxiliary stator coil is connected to the midpoint between two semiconductor switches of the second arm, and the other ends of the main stator coil and the auxiliary stator coil are connected to the midpoint between two semiconductor switches of the third arm. The semiconductor switches are switched using an inverting circuit and a delay circuit so that a first AC voltage is supplied to the one end of the main stator coil and a second AC voltage, which is shifted in phase by 90&#xb0; from the first AC voltage, is supplied to the one end of the auxiliary stator coil.

Anode rotational drive device and X-ray imaging apparatus

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.

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Tokyo, Japan

Shingo Hishikawa