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51. 发明专利

JPS6288299A INVERTER TYPE X-RAY APPARATUS 失效
公开(公告)号：JPS6288299A
公开(公告)日：1987-04-22
申请号：JP22700485
申请日：1985-10-14
申请人： HITACHI MEDICAL CORP
发明人： UEMURA HIDEKI , HINO HIROBUMI , KANEKO KAZUO
IPC分类号： H05G1/20
摘要： PURPOSE:To reduce the size and the price by employing a reactor splitted into plural sections in order to achieve same inductance. CONSTITUTION:A smoothing reactor section is constituted not with single reactor but with plural splitted reactors 9a, 9b connected in parallel so as to achieve necessary inductance or current capacity. Said reactors 9a, 9b are connected respectively in series with switching elements 8a, 8b. Consequently, the constituting freedom is increased when compared with a case employing single reactor resulting in reduction of the size and the price. While since the reactor can be selected by means of the switching elements, the voltage can be regulated stably and quickly over a wide load range.

52. 发明专利

JPS61158698A INVERTER-TYPE X-RAY PLANT 失效
公开(公告)号：JPS61158698A
公开(公告)日：1986-07-18
申请号：JP27973784
申请日：1984-12-28
申请人： HITACHI MEDICAL CORP
发明人： HINO HIROBUMI , UEMURA HIDEKI , KANEKO KAZUO , HATAKEYAMA KEISHIN , YAMAMOTO KAZUO
IPC分类号： H05G1/20 , H05G1/46
摘要： PURPOSE:To reduce a current capacity of a semiconductor switching element in a inverter and decrease wiring loss by controlling current, with input voltage of an inverter being heightened through a DC-DC converter. CONSTITUTION:Commercial power-supply current is full-wave rectified in a full-wave rectifier circuit 1 and supplied into a DC-DC converter 9 for boosting. A transistor 9b in this converter 9 is controlled by an electrification-factor controller 12 and a base circuit 13, and current flows into a reactor 9a to store magnetic energy at the on period of the transistor 9b. At the off period of the transistor 9b, energy is supplied into a condenser 9d and an inverter 5 through a diode 9c, so as to boost the input voltage of the inverter 5 higher than the input voltage of the converter 9. Consequently, as the current of the inverter 5 can be controlled at a low level, current capacity of a switching element in the inverter 5 can be reduced, together with decreasing a wiring loss, which is caused by wiring resistance in both the inverter 5 and the primary winding or the like in a high voltage transformer 6.

53. 发明专利

JPH0869893A INVERTER TYPE X-RAY DEVICE 失效
公开(公告)号：JPH0869893A
公开(公告)日：1996-03-12
申请号：JP22739194
申请日：1994-08-30
申请人： HITACHI MEDICAL CORP
发明人： SAKAMOTO KAZUHIKO , TAKAHASHI JUN , TAKANO HIROSHI , KOBAYASHI ICHIRO , UEMURA HIDEKI
IPC分类号： H05G1/20
摘要： PURPOSE: To restrain surge voltage to prevent the rupture of a switch by connecting between a DC power source and an inverter by means of a laminated plate to reduce the inductance of a wiring. CONSTITUTION: A laminated plate 6 is formed by laminating the first layer of the conductive plate 61 of a positive electrode, the second layer of the conductive plate 62 of a negative electrode, and the third layer formed of the conductive plate 63 of the output of the positive electrode and the conductive plate 64 of the output of the negative electrode; to nip first and second insulators 65 and 66 between these respective layers. Consequently, electric currents Ip and In flowing to an inverter from a DC power source flow to an output terminal OUT from an input terminal IN on the plates, but since uniformity is absent in the direction of a flow, thereby also generated magnetic flux has no uniform direction. In the magnetic flux genetated in the same plane on the plates, neighboring magnetic flux is canceled, and uncanceled magnetic flux becomes difficult to be interfered because of a distance to narrow magnetic fields f1 and f2 generated in the whole plates. As a result, wiring inductance can be sharply reduced to restrain surge voltage to prevent the rupture of a switch.

54. 发明专利

JPH0696894A INVERTER TYPE X-RAY HIGH-VOLTAGE DEVICE 失效
公开(公告)号：JPH0696894A
公开(公告)日：1994-04-08
申请号：JP26778892
申请日：1992-09-11
申请人： HITACHI MEDICAL CORP
发明人： CHABATA KEIICHI , TAKANO HIROSHI , KOBAYASHI ICHIRO , UEMURA HIDEKI
IPC分类号： H05G1/20 , H05G1/26 , H05G1/32
摘要： PURPOSE:To surely prevent the breakage of a switching element when an overcurrent is generated. CONSTITUTION:The inter-terminal voltage is inputted from driving circuits 3a-3d, the overcurrent by the arm short circuit is detected by a comparing circuit 11, the inverter output current is inputted from a sensor 10, and the overcurrent by a load circuit is detected by the second comparing circuit 12. The overcurrent is compared with the reference value by the comparing circuit 11 or the second comparing circuit 12 respectively, signals are outputted to driving circuits 3a-3d if the measured value is larger, and operations of gate insulation type bipolar transistors 2a-2d are stopped. Overcurrents by the arm short circuit and load short circuit are separately detected respectively, the overcurrents can be surely detected, and the breakage of IGBT2 can be prevented.

55. 发明专利

JPH05315090A X-RAY DEVICE 失效
公开(公告)号：JPH05315090A
公开(公告)日：1993-11-26
申请号：JP14694392
申请日：1992-05-13
申请人： HITACHI MEDICAL CORP
发明人： UEMURA HIDEKI
IPC分类号： H05G1/34
摘要： PURPOSE:To improve operability and maintainability by heating a filament in a nonheated condition to an optimum temperature at a high speed, shortening a time from fluoroscopy to photographing, and further preventing the filament from breaking. CONSTITUTION:In the case of fluoroscopy by a filament resistance detecting circuit 5, filament resistance R'f is calculated from output voltage V'f and an output current I'f of a filament heating circuit 4. This resistance position is fed back to the heating circuit 4, to drive a select switch 8, and a small focal point RsetL or large focal point RsetS is selected and adjusted so as to obtain a predetermined resistance value. By this constitution, a filament in a nonheated condition can be heated at a high speed to an optimum temperature, and a delay time can be shortened. A device can correspond to any kind of X-ray tube, to improve operability and maintainability without generating also a wire break.

56. 发明专利

JPH0556635B2 失效
公开(公告)号：JPH0556635B2
公开(公告)日：1993-08-20
申请号：JP2192586
申请日：1986-02-05
申请人： HITACHI MEDICAL CORP
发明人： HINO HIROBUMI , UEMURA HIDEKI , KANEKO KAZUO
IPC分类号： H05G1/48 , H05G1/20

57. 发明专利

JPH05205897A INVERTER TYPE X-RAY APPARATUS 失效
公开(公告)号：JPH05205897A
公开(公告)日：1993-08-13
申请号：JP3689492
申请日：1992-01-29
申请人： HITACHI MEDICAL CORP
发明人： TAKANO HIROSHI , UEMURA HIDEKI
IPC分类号： H05G1/20 , H05G1/32
摘要： PURPOSE:To protect the switch of an inverter by reducing inductance caused by wiring between a DC power source and the inverter, and restraining surge voltages generated at both ends of the switch. CONSTITUTION:In an inverter type X-ray apparatus comprising a DC power source 1, an inverter 2, a high voltage transformer 3, a high voltage rectifier 4 and an X-ray tube 5, the DC power source 1 is connected to the inverter 2 by laminated wiring 6. The laminated wiring 6 comprises positive conductors 101, 102 and negative conductors 201, 202 of rectangular cross section both covered by insulating material 60. The areas S1-S3 through which the magnetic flux of magnetic fields f1-f4 generated by currents flowing through the conductors pass are thereby reduced and the inductance of the wiring for connecting the DC power source 1 to the inverter 2 is reduced. Since the laminated wiring 6 has small inductance, surge voltage generated at the switch of the inverter is restrained so that breaking of the switch can be prevented.

58. 发明专利

JPH0547493A INVERTER TYPE X-RAY HIGH VOLTAGE DEVICE 失效
公开(公告)号：JPH0547493A
公开(公告)日：1993-02-26
申请号：JP23111291
申请日：1991-08-20
申请人： HITACHI MEDICAL CORP
发明人： HATAKEYAMA KEISHIN , UEMURA HIDEKI
IPC分类号： H05G1/32
摘要： PURPOSE:To improve X-ray output and the ray quality in an inverter type X-ray high voltage device by suppressing a drop, pulsation, fluctuation in tube voltage due to dropping of inverter input voltage generated each time the inverter is switched, and whereby stabilizing the tube voltage. CONSTITUTION:A phase setting circuit 9 for determining operational phase of a transistor of an inverter 2 based on setting signal of such as tube voltage and tube current, a phase control circuit 10 for reversing the transistors of right string as well as of left string of the inverter 2, and for having them alternately worked, and a capacitor 7 serving as an input voltage fluctuation suppression means for compensating dropping of input voltage of the inverter, or a serial connected body between the capacitor 7 and a resistance 8, are provided in an inverter-type X-ray high voltage device. The size and the weight of the entire device are thus reduced, and the output voltage to the load in a wide region is stably controlled.

59. 发明专利

JPH04325880A INVERTER CIRCUIT 失效
公开(公告)号：JPH04325880A
公开(公告)日：1992-11-16
申请号：JP12188991
申请日：1991-04-25
申请人： HITACHI MEDICAL CORP
发明人： KAWASAKI NOBORU , UEMURA HIDEKI
IPC分类号： H02M7/537
摘要： PURPOSE:To operate an inverter circuit using a switching element having a turn-off delay time with high frequency and to reduce in size a device. CONSTITUTION:A current between a base and an emitter of a bipolar transistor as a switching element is detected by a turn-off detector provided in driving circuits 6-9 of a plurality of switching elements 1-4, and cut-off of a current of each switching element is detected by comparing it with a predetermined detection level. A turn-on signal of the other switching element connected in series with the plurality of elements 1-4 is generated by AND circuits 27-30 respectively connected to the driving circuits 6-9 according to a current cut-off signal from one side of the same string of the elements 1-4.

60. 发明专利

JPH04284399A INVERTER TYPE X-RAY DEVICE 失效
公开(公告)号：JPH04284399A
公开(公告)日：1992-10-08
申请号：JP4783391
申请日：1991-03-13
申请人： HITACHI MEDICAL CORP
发明人： UEMURA HIDEKI
IPC分类号： H05G1/10 , H05G1/20 , H05G1/34 , H05G1/38
摘要： PURPOSE:To stabilize X-ray output by providing a power source impedance measurement circuit for measuring the impedance of AC power source from device input voltage as well as input current. CONSTITUTION:Device input voltage as well as input current are detected by a power source impedance measurement circuit 12 through an insulating amplifier 13 and a current transformer 14, respectively. These outputs are converted into digital mode, and are stored in a digital storage circuit 15. Power source impedance is calculated by a no-load input calculation circuit 16 obtained by the circuit 15 based on the ratio of the difference between voltage effective value and a no-load input current effective value. When the input voltage of an inverter 5 is reduced, an X-ray condition that does not saturate inverter control parameter in a feedback circuit 11 is set. Since the saturation of the inverter control parameter is prevented, accuracy and reproducibility of X-ray output is improved.

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