CN100553086C - Power conversion device, inverter X-ray high voltage device, X-ray fluoroscopy camera device, X-ray CT device, MRI device - Google Patents
Power conversion device, inverter X-ray high voltage device, X-ray fluoroscopy camera device, X-ray CT device, MRI device Download PDFInfo
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- CN100553086C CN100553086C CNB2005800082918A CN200580008291A CN100553086C CN 100553086 C CN100553086 C CN 100553086C CN B2005800082918 A CNB2005800082918 A CN B2005800082918A CN 200580008291 A CN200580008291 A CN 200580008291A CN 100553086 C CN100553086 C CN 100553086C
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 9
- 238000002594 fluoroscopy Methods 0.000 title 1
- 239000003990 capacitor Substances 0.000 claims abstract description 131
- 230000006866 deterioration Effects 0.000 claims abstract description 70
- 238000003860 storage Methods 0.000 claims abstract description 14
- 238000007599 discharging Methods 0.000 claims abstract 5
- 230000009471 action Effects 0.000 claims description 17
- 230000007423 decrease Effects 0.000 claims description 8
- 230000005855 radiation Effects 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 238000002059 diagnostic imaging Methods 0.000 abstract description 8
- 238000009499 grossing Methods 0.000 abstract description 5
- 238000002595 magnetic resonance imaging Methods 0.000 description 17
- 238000012544 monitoring process Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 9
- 230000006870 function Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 6
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- 230000015556 catabolic process Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/385—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
- G01R33/3852—Gradient amplifiers; means for controlling the application of a gradient magnetic field to the sample, e.g. a gradient signal synthesizer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC
- H02M5/42—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters
- H02M5/44—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC
- H02M5/453—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- X-Ray Techniques (AREA)
- Power Conversion In General (AREA)
Abstract
本发明的电力变换装置具有：将工业交流电压整流为直流电压的变换器；使直流电压平滑的电容器；将平滑了的直流电压变换成预定频率的交流电压的逆变器；在每次使用电力变换装置时测量上述电容器的充放电特性的测量单元；事先通过上述测量单元测量初始状态下上述电容器的充放电特性、并存储测量出的特性的存储单元；对由测量单元在上述每次使用时测量出的充放电特性和由上述存储单元存储的初始状态下的充放电特性进行比较的比较单元；根据比较结果判断上述电容器的劣化状态的电容器劣化判断单元；和通知电容器劣化状态的通知单元。由此，可以防止伴随电容器劣化的故障，因此作为向医用图像诊断装置提供的稳定电源可确保其高可靠性。
The power conversion device of the present invention has: a converter for rectifying an industrial AC voltage into a DC voltage; a capacitor for smoothing the DC voltage; an inverter for converting the smoothed DC voltage into an AC voltage of a predetermined frequency; A measuring unit for measuring the charging and discharging characteristics of the above-mentioned capacitor when changing the device; a storage unit for measuring the charging and discharging characteristics of the above-mentioned capacitor in the initial state through the above-mentioned measuring unit in advance, and storing the measured characteristics; a comparing unit for comparing the measured charging and discharging characteristics with the charging and discharging characteristics in the initial state stored by the storage unit; a capacitor deterioration judging unit for judging the deterioration state of the capacitor based on the comparison result; and a notification unit for notifying the deterioration state of the capacitor. As a result, failures associated with deterioration of the capacitor can be prevented, and thus high reliability can be ensured as a stable power supply for medical imaging diagnostic equipment.
Description
Technical field
The present invention relates to power-converting device as the power supply of medical diagnostic imaging apparatus, described medical diagnostic imaging apparatus comprises inversion X line high voltage device, X line fluoroscopic, x-ray ct device and MRI (Magnetic Resonance Imaging: device magnetic resonance imagine), particularly relate to following technology: observation is in the degradation of the capacitor of the input stage setting of inverter, and prevent the fault of the power-converting device that causes because of the capacitor deterioration by this observation, thereby prevent to guarantee high reliability by this fault.
Background technology
Power-converting device has: the interchange reactance coil that is connected with industrial power, the converter circuit that is connected with this interchange reactance coil, the capacitor that is connected with this converter circuit, the inverter circuit that is connected with this capacitor, the transformer that is connected with this inverter circuit, the rectification circuit and the load that are connected with this transformer.
Exchange reactance coil industrial power is provided.The AC voltage conversion (rectification) that converter circuit will exchange reactance coil becomes direct voltage.Capacitor removal (smoothly) is superimposed on the fluctuation composition on the direct voltage that is formed by the converter circuit rectification.Inverter circuit will become high-frequency ac voltage by the dc voltage conversion of the level and smooth mistake of capacitor.High voltage transformer will be boosted by the high-frequency ac voltage that the inverter circuit conversion forms and be ac high voltage.Ac high voltage after rectification circuit will be boosted by transformer is rectified into dc high voltage.Load is the gradient magnetic field coil of X spool or magnetic resonance imagine device.
Here, when above-mentioned capacitor is done level and smooth action at every turn, owing to there is fluctuating current, therefore cause above-mentioned capacitor self-heating, according to its heating and environment for use, at the dielectric of this capacitor or in electrolytic capacitor, electrolyte etc. can continuous deterioration when each electrification converting means.The deterioration of capacitor not only can be lost smoothing function, and also the fluctuation composition that can not remove by its smoothing function be provided to inverter circuit, and inverter circuit can not regular event, makes above-mentioned power-converting device produce fault.
Therefore, a kind of processing method as the capacitor deterioration has [patent documentation 1].
[patent documentation 1] has: to the measuring unit measured of the electrology characteristic value of capacitor arbitrarily in the electrostatic capacitance of capacitor, tan δ, leakage current, the impedance; The memory cell that the result that measuring unit is measured stores by the time sequence; With the judging unit of judging the deterioration of capacitor according to the event memory of memory cell, it predicts and shows the deterioration of capacitor according to the electrology characteristic Value Data of the capacitor of pressing the time sequence measuring.
Patent documentation 1: the spy opens the 2002-267708 communique
But, the processing method of [patent documentation 1], its purpose is, under the prerequisite that the electrolytic capacitor of placing on not signal processing circuit substrate takes out from circuit, carry out the deterioration diagnosis of capacitor, therefore, corresponding to high reliability request, still there is following some deficiency as the suitable power-converting device of the power supply of medical diagnostic imaging apparatus.
(1) in power-converting device, need frequently carry out the judgement of capacitor deterioration, and must before the fault that is caused by the capacitor deterioration produces, handle.
But, in [patent documentation 1], only record the judgement of carrying out the capacitor deterioration by the time sequence, therefore the explanation capacitor deterioration is judged when being used for power-converting device urgency and importance do not have actual effect.
(2) in [patent documentation 1], the judgement of capacitor deterioration is used is the capacitor specific characteristics judgment value of storage in advance in the database, and that does not therefore consider capacitor intrinsicly departs from the influence that this capacitor self deterioration is brought.
(3) in [patent documentation 1], do not have to consider after the fault of judging the capacitor deterioration, about the Notification Method of warning.
Summary of the invention
Power-converting device of the present invention, it is characterized in that having: converter, move under non-pressure-increasning state and pressure-increasning state, described non-pressure-increasning state is only to be the state of direct voltage with industrial ac voltage rectifier, and described pressure-increasning state is the state that boosts in rectification; Capacitor, the direct voltage that has made by this converter rectification is level and smooth; Inverter, will by this capacitor level and smooth dc voltage conversion become the alternating voltage of preset frequency; Measuring unit when pressure-increasning state switches to non-pressure-increasning state, is measured the charge-discharge characteristic of above-mentioned capacitor at each above-mentioned converter; Memory cell, in advance measure when dispatching from the factory by above-mentioned measuring unit or the initial condition in when installation under the charge-discharge characteristic of above-mentioned capacitor, and store the charge-discharge characteristic of above-mentioned capacitor under this initial condition of measuring; Comparing unit, to by this measuring unit at the charge-discharge characteristic of the capacitor that each above-mentioned converter is measured when pressure-increasning state switches to non-pressure-increasning state and under by the initial condition of said memory cells storage the charge-discharge characteristic of capacitor compare; Capacitor deterioration judging unit according to by this comparing unit result relatively, is judged the deterioration state of above-mentioned capacitor; And notification unit, the deterioration state of the capacitor that notice is gone out by this capacitor deterioration judgment unit judges.
Inversion X line high voltage device of the present invention is characterized in that having: above-mentioned power-converting device; High voltage transformer is connected with the output of the inverter of above-mentioned power-converting device, and the output voltage of above-mentioned inverter is boosted; The output transform of this high voltage transformer is become the high voltage rectifier of dc high voltage; Be connected with the output of this high voltage rectifier, as the X spool of load; And the operating unit of setting the X line output condition of this X spool.
X line fluoroscopic of the present invention is characterized in that having: above-mentioned inversion X line high voltage device; The X line source provides high voltage from this inversion X line high voltage device, and produces the X line, and the roentgen radiation x that will produce is to the examinee; Be subjected to the picture unit, be oppositely arranged, receive the X line that sees through above-mentioned examinee with this X line source; Demonstration is subjected to be subjected to the display part of X line picture behind the picture as the unit by this; And operating desk, input is used to control above-mentioned X line source, above-mentioned bed platform and the above-mentioned controlled quentity controlled variable that is subjected to the picture unit.
X-ray ct device of the present invention is characterized in that, has: above-mentioned inversion X line high voltage device; The X line source provides high voltage from this inversion X line high voltage device, and produces the X line, and the roentgen radiation x that will produce is to the examinee; The X thread detector is oppositely arranged across above-mentioned examinee with this X line source, detect see through above-mentioned examinee the X line as data for projection; Support and rotate the swivel plate of this X thread detector and above-mentioned X line source; Graphics processing unit utilizes by this swivel plate rotation and the data for projection that obtains from a plurality of directions, above-mentioned examinee's layer image is carried out image reconstruct; And image-display units, show the layer image that has carried out the reconstituted above-mentioned examinee of image by this graphics processing unit.
MRI device of the present invention has: the static field magnet that produces uniform magnetostatic field in the space at examinee place; In this space, form the gradient magnetic field coil that magnetic field tilts; The irradiation coil, on the atomic nucleus of the atom of the tissue that constitutes the examinee, the high frequency magnetic field of irradiation and this nuclear resonance frequency same frequency; Reception is by the receiving coil of the NMR signal of examinee's generation; Graphics processing unit carries out signal processing to the NMR signal that is received by this receiving coil, and above-mentioned examinee's layer image is carried out image reconstructs computing; And image-display units, showing the layer image that has carried out the reconstituted above-mentioned examinee of image by this graphics processing unit, this MRI device is characterised in that, offers the leaning magnetic field power supply of above-mentioned gradient magnetic field coil, is above-mentioned power-converting device.
Thus, the fault of capacitor deterioration can be prevented to follow, therefore its high reliability can be guaranteed as the stabilized power supply that provides to medical diagnostic imaging apparatus.
Description of drawings
Fig. 1 is the block diagram of the structure example of the expression X line fluoroscopic that adopts power-converting device of the present invention.
Fig. 2 is the block diagram of the structure example of the expression x-ray ct device that adopts power-converting device of the present invention.
Fig. 3 is the block diagram of the embodiment of the expression contravariant X line high voltage device that adopts power-converting device of the present invention.
Fig. 4 is the block diagram that is illustrated in the voltage decline curve at capacitor two ends of Fig. 3, drops to the comparison of the voltage fall time till a certain scheduled voltage.
Fig. 5 be illustrated in the voltage decline curve at capacitor two ends of Fig. 3, the block diagram of the comparison of the magnitude of voltage of a certain predetermined down under the time.
Fig. 6 is the block diagram of the structure example of the expression MRI device that adopts power-converting device of the present invention.
Fig. 7 is the block diagram of the structure example of the power-converting device that adopted of expression MRI device shown in Figure 6.
Embodiment
Below, embodiments of the present invention are described with reference to the accompanying drawings.
(embodiment 1)
The load that power-converting device is described in the present embodiment is the situation of X spool.Utilize the medical diagnostic imaging apparatus of X spool, X line fluoroscopic, x-ray ct device are arranged.The system configuration example of X line fluoroscopic utilizes Fig. 1 to describe, and the system configuration of x-ray ct device utilizes Fig. 2 to describe.
Fig. 1 is an example of X line fluoroscopic, is the system configuration example that is used for C arm type X line fluoroscopic.
C arm type X line fluoroscopic has: inversion X line high voltage device 100; Bed platform 101; Image receiving means 102; The monitor 103 that is connected with image receiving means 102; The operating desk 104 that is connected with bed platform 101, image receiving means 102 and X spool 107; Support image receiving means 102 and make its relative bracing or strutting arrangement 106 with X spool 107; And the X spool 107 that is connected with inversion X line high voltage device 100 by high-voltage cable 105.
Inversion X line high voltage device 100 is to be connected with the power-converting device of X spool 107 as load.Bed platform 101 is the platforms that are used to carry the patient.Image receiving means 102 is the X line that is used to have accepted to see through the patient film that sees through picture, image intensifier (I.I.), X line area detector (FPD) etc.Monitor 103 shows that in X-ray room the X line sees through picture.Operating desk 104 has the function of action separately of the setting of control X lines spare, demonstration that the X line sees through picture and X spool 107, image receiving means 102, bed platform 101.High-voltage cable 105 will supply to X spool 107 from the high voltage of inversion X line high voltage device 100.Bracing or strutting arrangement 106 supports X spool 107 and makes its relative configuration with image receiving means 102.X spool 107 is to patient exposure X line.
The X line fluoroscopic of Gou Chenging like this, carried out patient's the location at shooting position at operation bed platform 101 and bracing or strutting arrangement 106 after, set X lines spare by operating desk 104, X lines spare according to this setting, apply dc high voltage (tube voltage) from inversion X line high voltage device 100 to X spool 107 via high-voltage cable 105, from X spool 107 to the patient exposure X line that is carried on the platform 101.The X line of irradiation sees through the patient, and accepts the X line by image receiving means 102.Seen through picture by what image receiving means 102 had looked like, be presented at monitor 103 and be installed in the monitor on the operating desk 104.
Fig. 2 is the system configuration example of x-ray ct device.
X-ray ct device has: X spool 201, the X line filter 202 and the collimator 203 that on roentgen radiation x direction, are provided with from X spool 201, bed platform top board 204, the X line grating 205 that on the input face direction of X thread detector 206, is provided with, X thread detector 206, swivel plate 207, stand 208, measuring condition setup unit 211, shooting control unit 212, swivel plate driver element 213, bed platform mobile unit 214, image collection unit 215, graphics processing unit 216, image-display units 217, collimator control unit 218.
Central portion at stand 208 is provided with peristome 210, inserts configuration examinee 209 therein.
X line generation-detection system by X spool 201, X line filter 202, collimator 203, X line grating 205 and X thread detector 206 constitute is referred to as camera system.Camera system is fixed on the swivel plate 207, rotates by not shown known drive motor.Rotating shaft with swivel plate 207 is the Z axle.And, be that the level of initial point and the reference axis of vertical direction are made as X-axis, Y-axis respectively with pivot O.In addition, X-axis is made as θ with respect to the anglec of rotation that the X line produces some S.
Above-mentioned x-ray ct device moves according to following steps.The tester sets measured zone, image pickup mode of examinee 209 Z-direction etc. by measuring condition setup unit 211.Measuring condition setup unit 211 is input to collimator 218 and shooting control unit 212 with the information of above-mentioned set point.Collimator control unit 218 according to above-mentioned set point control collimator 203, changes the irradiation area of X line.Shooting control unit 212 is formulated X spool 201 according to above-mentioned set point and is produced the sequential of X line and the shooting sequential of X thread detector 206.And shooting control unit 212 is formulated and is given the rotatable sequence (シ one ケ Application ス) of swivel plate driver element 213 and give a mobile sequence of platform mobile unit 214.And then shooting control unit 212 is also formulated reading/saving sequence of the camera data of giving image collection unit 215.At this, the operator is after omitted illustrated operator input scan sign on, and rotating plate driver element 213 according to the rotatable sequence of being given by shooting control unit 212, utilizes not shown known CD-ROM drive motor to make swivel plate 207 rotations.Bed platform mobile unit 214, the bed platform mobile sequence according to being given by shooting control unit 212 utilizes not shown known drive motor, and the examinee 209 on a platform top board 204 and the bed platform top board 204 is moved along Z-direction.By the X line that X spool 201 produces, remove harmful low-energy component by X line filter 202, and limited after the irradiation area by collimator 203, shine examinee 209.Seen through examinee 209 X line, removed after the scattered rays, detected by X thread detector 206, and convert the signal of telecommunication to by the X line grating.The above-mentioned signal of telecommunication that detects by not shown known collector ring mechanism, is sent to image collection unit 215.Image collection unit 215 becomes numerical data and preservation by not shown known A/D converter with the above-mentioned electrical signal conversion that detects.Graphics processing unit 216 according to the numerical data of above-mentioned preservation, carries out reconstructing of CT image, and will the results are shown in image-display units 217.
Fig. 3 represents to be connected with in the load of power-converting device in the present embodiment the example of the contravariant X line high voltage device of X spool.
Contravariant X line high voltage device has: the boost converter that is connected with industrial voltage (Voltage step up Converter) 301, the capacitor 302 that is connected with boost converter, the resistance 303 that is connected with capacitor 302, the inverter 304 that is connected with resistance 303, the high voltage transformer 305 that is connected with inverter 304, the high voltage rectifier 306 that is connected with high voltage transformer 305, tube voltage detector 307 that is connected with high voltage rectifier 306 and X spool 308, the convertor controls portion 309 that is connected with boost converter 301, the inverter control part 311 that is connected with inverter 304, be connected and contain the digital-control circuit 312 of capacitor monitoring deterioration portion 310 with capacitor 302 and inverter control part 311, and the operating portion 313 that is connected with digital-control circuit 312.
Next, the function of above-mentioned inscape is done simple declaration respectively.Boost converter 301 is to have IGBT (the Insulated Gate BipolarTransistor: the high power factor converting device of boost function igbt) that has used as power model.This boost converter 301, (Pulse Width Modulation: pulse-width modulation) action comes the industrial three-phase alternating-current supply voltage of 50Hz or 60Hz is carried out rectification by PWM, and be made as zero by leading or hysteresis essence, make power factor be roughly 1 phase voltage and phase current.This boost converter 301, after the action that makes IGBT stopped, as full-wave rectifying circuit action, the VD during its full-wave rectification became AC-input voltage
Doubly.
Capacitor 302, in order to ensure above-mentioned AC-input voltage
Doubly withstand voltage and be provided with two with being connected in series.Resistance 303 is to be provided with for the voltage that makes above-mentioned two capacitors 302 that are connected in series is evenly distributed.Inverter 304 will become high-frequency ac voltage from the dc voltage conversion of boost converter 301 outputs.Inverter 304 also has controls the function that is applied to as the voltage (tube voltage) on the X spool 308 of load.
High voltage transformer 305, its primary coil is connected with the output of inverter 304, and the alternating voltage that is transformed into by inverter 304 is boosted.High voltage rectifier 306 will be transformed into dc high voltage from the high-frequency high-voltage of the secondary coil of high voltage transformer 305, and its output is connected with X spool 308, and this dc high voltage is applied on the X spool 308.Tube voltage detector 307 detects the voltage that is applied on the X spool 308.X spool 308 provides dc high voltage by rectifier 306, and produces the X line.
Digital-control circuit 312 has: convertor controls portion 309, capacitor monitoring deterioration portion 310 and inverter control part 311.
IGBT in the convertor controls portion 309 switches control boost converter 301.Capacitor monitoring deterioration portion 310 monitors the deterioration of capacitor 302.Inverter control part 311 has following function: detect the output voltage of phase current and boost converter 301, and by tube voltage detector 307 detector tube voltages, make it consistent with desired value.
313 pairs of digital-control circuits of operating portion 312 are set based on tube voltage/tube current and X line the expose to the sun operation condition of the time of penetrating and instruction thereof etc.And, have the function that monitors the power-converting device state.
Secondly, as the capacitor monitoring deterioration portion 310 following formations of major part of the present invention.
Power-converting device, under its initial condition when installing (when dispatching from the factory or etc.), make boost converter 301 actions after, when stopping its action (non-pressure-increasning state), capacitor 302 enters the full-wave rectification state by resistance 303 discharges.Capacitor monitoring deterioration portion 310 enters dropping voltage characteristics during the full-wave rectification state, capacitor 302 two ends to the discharge from capacitor 302 and detects.And then capacitor monitoring deterioration portion 310 with the dropping voltage characteristic of its detected dropping voltage characteristic as initial condition, is stored in the memory in the capacitor deterioration diagnosis portion 310.
As shown in Figure 4, the storage means of this moment, the value of the voltage decline of storage after the boost action of boost converter 301 stops to have begun to pass through the scheduled time.In addition, as shown in Figure 5, other storage meanss are storages to be stopped to voltage from the boost action of boost converter 301 and drops to elapsed time till the scheduled voltage.These storage meanss can be used use also capable of being combined separately.
Next, capacitor deterioration diagnosis portion 310, when the use of power-converting device (here, also abbreviate " when device uses " as), begin when the boost action from above-mentioned boost converter 301 is stopped to entering till the full-wave rectification state during in the dropping voltage characteristic of capacitor 302 detect the dropping voltage characteristic when using.Capacitor deterioration diagnosis portion 310, the dropping voltage characteristic when relatively being stored in the dropping voltage characteristic of the initial condition in the above-mentioned memory and installing use, if its comparative result meets following situation at least, then make capacitor 302 judgement of deterioration:
Voltage decrease speed when (1) device uses is increased to the situation of predetermined value compared with initial condition;
Voltage decrease speed when (2) device uses is measured in use at every turn, all situation about increasing with predetermined ratio.
Capacitor monitoring deterioration portion 310 judging capacitor 302 under the situation of deterioration, generates warning signal.The warning signal of this generation is sent to the warning display part 314 of operating portion 313.
Warning display part 314 when capacitor monitoring deterioration portion 310 receives warning signal, is notified this warning to the operator.Here, notice is meant, five senses such as tactile data that produce by auditory informations such as visual information, sound such as demonstrations, by the vibrations such as vibrator of mobile phone are informed to the operator of medical diagnostic imaging apparatus.
The independent as follows or combination of the notice of this moment is carried out.
(1) warning display part 314 shows " think capacitor deterioration " so direct message.In addition, warning display part 314 also can be provided with sound producer and loud speaker separately, sends above-mentioned message with the form of sound.And then warning display part 314 also can make the framework vibration of warning display part 314 when showing above-mentioned message or sounding.
(2) warning display part 314 shows " please this being warned code to get in touch with service centre " so indirect message within a week when showing the warning code.And warning display part 314 also can be provided with sound producer and loud speaker separately, sends above-mentioned message with the form of sound.And then warning display part 314 also can make the framework vibration of warning display part 314 when showing above-mentioned message or sounding.
(3) warning display part 314 is lighted emergency warning lamp.If this emergency warning lamp is designed to imitate the shape of electrolytic capacitor, then be easy to intuitivism apprehension.
(4) warning display part 314, can be not limited to the demonstration or the non-demonstration of above-mentioned (1)～(3), and via the interface that can send to networks 315 such as internet, the deterioration information of above-mentioned capacitor 302 is sent to network 315, be arranged on the receiving terminal 316 (personal computer) of the service centre that is connected with network 315 equally etc., the deterioration information of the capacitor 302 that reception is sent by above-mentioned transmitting element is informed the degradation of the capacitor of power-converting device.
If the circuit structure of above explanation then need not to be provided with the resistance and the switch that are connected in parallel with respect to capacitor.
Like this,, therefore do not need and the proportional high withstand voltage switch of voltage that is applied on the capacitor miniaturization that can implement device because converter circuit is boost converter.
As mentioned above, present embodiment, when being used to use the contravariant X line high voltage device of booster type high power factor converting device, need not to add particular component, and, by the standard that the dropping voltage characteristic of the capacitor of initial condition is judged as deterioration, can judge the deterioration that each capacitor carry out high-precision above-mentioned capacitor.
Like this, can avoid power-converting device in action, to produce fault.
In the circuit structure of above explanation, explanation be that converter circuit is the example of boost converter, but implementing under the situation of the present invention, converter is not limited to boost converter.
This is because of the present inventionly focus on eliminating the influence of capacitor deterioration to power-converting device, so problem is the frequency of the deterioration diagnosis of capacitor, so the kind of converter is not limited to booster type.
(embodiment 2)
Next, in the present embodiment, the load that power-converting device is described is the situation of the gradient magnetic field coil of MRI device.
Fig. 6 is a whole schematic diagram of having used MRI device of the present invention.This MRI device has: the static field magnet 601 that produces uniform magnetostatic field in the space at examinee 612 places; In this space, form the gradient magnetic field coil 602 that magnetic field tilts; Irradiation coil 604, on the atomic nucleus of the atom of the tissue that constitutes examinee 612, the high frequency magnetic field of irradiation and its resonance frequency same frequency; And the receiving coil 606 that receives the NMR signal that produces by examinee 612.Gradient magnetic field coil 602 is connected with leaning magnetic field power supply 603, and irradiation coil 604 is connected with transmitting system 605, and this transmitting system 605 is made of the oscillator of the generation and the high frequency of above-mentioned resonance frequency same frequency, modulator, amplifier etc.In addition, receiving coil 606 is connected with receiving system 607, and this receiving system 607 is made of amplifier, phase detector, A/D converter etc.
Leaning magnetic field power supply 603, transmitting system 605 and receiving system 607 are connected with CPU 608.CPU 608, control the action of leaning magnetic field power supply 603, transmitting system 605 and receiving system 607, and the NMR signal of receiving system 607 receptions is carried out signal processing, carry out computings such as image reconstructs.CPU 608 has: storage devices such as ROM, RAM 611, and storage is used for the program of above-mentioned control, the program that is used for computing, operation result etc.; Display 609 is used to show image as operation result etc.; With operating desk 610, be used to import the instruction that makes device action, imaging conditions etc.
Particularly, the program that can be used as is for example enrolled shooting sequences such as gtadient echo method in advance, selects the shooting sequence of expectation in operating desk 610.And,, set for example about the sheet thickness and the thin slice coded number of thin slice, the make a video recording visual field (FOV), frequency band, asymmetric measure rate (AMI), number of samples etc. as the parameter of imaging conditions.Behind operating desk 610 setting shooting sequences and imaging conditions, make a video recording according to this shooting sequence.
In recent years, to the MRI device, just developing high speed image capture methods such as echo-planar imaging method.Be accompanied by the development of this high-speed camera method, power-converting device require to increase output current that magnetic field produces power supply, and shortens the voltage rise time, the trend of oriented big electric current, Towards Higher Voltage development.In order to improve the output current pace of change that magnetic field produces power supply, power-converting device need be input to the Towards Higher Voltage and the high stableization of the input voltage of gradient magnetic field coil.Therefore, use stable MRI device supply unit, as the magnetic field generation Switching Power Supply that is used to produce magnetostatic field and generation leaning magnetic field etc. with voltage-type AC-DC converter.
Fig. 7 is the block diagram that MRI device leaning magnetic field produces the supply unit example in the presentation graphs 6.
Leaning magnetic field produces supply unit 701 to have: the power-type AC-DC converter 703 that is connected with industrial power 702, the capacitor 704 that is connected with power-type AC-DC converter 703, the resistance 705 that is connected with capacitor 704, reach current amplifier 706.
Power-type AC-DC converter 703 is transformed into direct current with the alternating current of industrial power 702.Capacitor 704 makes the direct current smoothing that is transformed into by power-type AC-DC converter 703.Resistance 705 is connected in parallel with capacitor 704, is used for the voltage detecting of voltage detector 720.706 pairs of current amplifiers by capacitor 704 level and smooth direct current amplify.By the electric current that has amplified by current amplifier 706, drive gradient magnetic field coil 707.
The AC-DC converter of here using 703 has: the reactance coil 708～710 that is connected with industrial power 702, the fly-wheel diode that is connected with reactance coil 708～710 full-bridges, the IGBT 711～716 as switch element that is connected in parallel with fly-wheel diode.
This voltage-type AC-DC converter 703 is by control circuit 717 its output voltages of control.Promptly, control circuit 717, according to by the detected input current that flows to voltage-type AC-DC converter 703 of current detector 718,719, by the voltage of voltage detection unit 720 detected capacitors 704, and from the voltage instruction value of outside input, FEEDBACK CONTROL output voltage.In this control, smoothing capacitor 704 charges by reactance coil 708～710 and the switch element 711～716 that is connected with industrial power, and with respect to the duty ratio of its charging voltage change switch element 711～716, thus it is controlled at high voltage.And, output current Be Controlled circuit 721 FEEDBACK CONTROL of current amplifier 706.Control circuit 717 according to by current detector 722 detected current values with by the electric current designated value of outside input, is tried to achieve the magnification ratio of current amplifier 706, and by this magnification ratio Control current amplifier 706 of trying to achieve.
Like this, if apply the present invention to MRI,, therefore can guarantee its high reliability as the stabilized power supply that provides to the MRI device owing to can prevent to follow the fault of capacitor deterioration with on the supply unit.
And, though what mentioned in the above-described embodiments all is the boost converter of three-phase, the invention is not restricted to this, the power-converting device that uses single-phase boost converter also is suitable for certainly.
As mentioned above,, be not limited to above-mentioned disclosed execution mode, realize that the technology contents of the described technological thought of claim all belongs to the present invention though the present invention has been illustrated a plurality of execution modes.
Usability on the industry
Because power-converting device of the present invention can prevent from following the fault of capacitor deterioration, because of This can guarantee its high reliability as the stabilized power source that provides to medical diagnostic imaging apparatus.
Claims (16)
1. power-converting device is characterized in that having:
Converter moves under non-pressure-increasning state and pressure-increasning state, and described non-pressure-increasning state is only to be the state of direct voltage with industrial ac voltage rectifier, and described pressure-increasning state is the state that boosts in rectification;
Capacitor, the direct voltage that has made by this converter rectification is level and smooth;
Inverter, will by this capacitor level and smooth dc voltage conversion become the alternating voltage of preset frequency;
Measuring unit when pressure-increasning state switches to non-pressure-increasning state, is measured the charge-discharge characteristic of above-mentioned capacitor at each above-mentioned converter;
Memory cell, in advance measure when dispatching from the factory by above-mentioned measuring unit or the initial condition in when installation under the charge-discharge characteristic of above-mentioned capacitor, and store the charge-discharge characteristic of above-mentioned capacitor under this initial condition of measuring;
Comparing unit, to by this measuring unit at the charge-discharge characteristic of the capacitor that each above-mentioned converter is measured when pressure-increasning state switches to non-pressure-increasning state and under by the initial condition of said memory cells storage the charge-discharge characteristic of capacitor compare;
Capacitor deterioration judging unit according to by this comparing unit result relatively, is judged the deterioration state of above-mentioned capacitor; And
Notification unit, the deterioration state of the capacitor that notice is gone out by this capacitor deterioration judgment unit judges.
2. power-converting device as claimed in claim 1 is characterized in that,
Above-mentioned measuring unit from the charging of above-mentioned capacitor action begins when discharging action stops when stopping till, is measured the dropping voltage characteristic at above-mentioned capacitor two ends, as the charge-discharge characteristic of above-mentioned capacitor.
3. power-converting device as claimed in claim 1 is characterized in that,
Above-mentioned converter is a boost converter, and said memory cells storage stops to begin value through the voltage decline of the above-mentioned capacitor after the scheduled time from the boost action of this boost converter.
4. power-converting device as claimed in claim 1 is characterized in that,
Above-mentioned converter is a boost converter, and said memory cells storage stops to begin dropping to elapsed time till the scheduled voltage to the voltage of above-mentioned capacitor from the boost action of this boost converter.
5. as any described power-converting device in the claim 2～4, it is characterized in that,
Above-mentioned judging unit, when being following situation, the result of above-mentioned comparing unit judges capacitor deterioration: the voltage decrease speed when above-mentioned capacitor discharges, compare with initial condition, be increased to predetermined value.
6. as any described power-converting device in the claim 2～4, it is characterized in that,
Above-mentioned judging unit, when being following situation, the result of above-mentioned comparing unit judges capacitor deterioration: the voltage decrease speed when above-mentioned capacitor discharges, when this capacitor discharge, measure at every turn, all increase with predetermined ratio.
7. as any described power-converting device in the claim 1～4, it is characterized in that,
Above-mentioned notification unit being gone out above-mentioned capacitor by above-mentioned judgment unit judges during deterioration, is shown in its deterioration information in the monitor.
8. power-converting device as claimed in claim 7 is characterized in that,
Above-mentioned notification unit is shown in above-mentioned deterioration information in the monitor with its countermeasure information.
9. power-converting device as claimed in claim 7 is characterized in that,
Above-mentioned notification unit, the shape of imitating above-mentioned capacitor is shown in above-mentioned deterioration information in the monitor.
10. as any described power-converting device in the claim 1～4, it is characterized in that,
Above-mentioned notification unit is being gone out above-mentioned capacitor during deterioration, by its deterioration information of sound notification by above-mentioned judgment unit judges.
11. as any described power-converting device in the claim 1～4, it is characterized in that,
Above-mentioned notification unit is being gone out above-mentioned capacitor during deterioration, by its deterioration information of vibration informing by above-mentioned judgment unit judges.
12. as any described power-converting device in the claim 1～4, it is characterized in that,
Above-mentioned notification unit has: transmitting element is sent to network with the deterioration information of above-mentioned capacitor; Receiving element is set in the service centre with this transmitting element different places, receives the deterioration information of the above-mentioned capacitor that is sent by above-mentioned transmitting element; And the unit that shows the deterioration information of the capacitor that receives by this receiving element.
13. an inversion X line high voltage device is characterized in that having:
Any described power-converting device in the claim 1～4; High voltage transformer is connected with the output of the inverter of above-mentioned power-converting device, and the output voltage of above-mentioned inverter is boosted; The output transform of this high voltage transformer is become the high voltage rectifier of dc high voltage; Be connected with the output of this high voltage rectifier, as the X spool of load; And the operating unit of setting the X line output condition of this X spool.
14. an X line fluoroscopic is characterized in that having:
The described inversion X of claim 13 line high voltage device; The X line source provides high voltage from this inversion X line high voltage device, and produces the X line, and the roentgen radiation x that will produce is to the examinee; Be subjected to the picture unit, be oppositely arranged, receive the X line that sees through above-mentioned examinee with this X line source; Demonstration is subjected to be subjected to the display part of X line picture behind the picture as the unit by this; And operating desk, input is used to control above-mentioned X line source, bed platform and the above-mentioned controlled quentity controlled variable that is subjected to the picture unit.
15. an x-ray ct device is characterized in that having:
The described inversion X of claim 13 line high voltage device; The X line source provides high voltage from this inversion X line high voltage device, and produces the X line, and the roentgen radiation x that will produce is to the examinee; The X thread detector is oppositely arranged across above-mentioned examinee with this X line source, detect see through above-mentioned examinee the X line as data for projection; Support and rotate the swivel plate of this X thread detector and above-mentioned X line source; Graphics processing unit utilizes by this swivel plate rotation and the data for projection that obtains from a plurality of directions, above-mentioned examinee's layer image is carried out image reconstruct; And image-display units, show the layer image that has carried out the reconstituted above-mentioned examinee of image by this graphics processing unit.
16. a MRI device has: the static field magnet that in the space at examinee place, produces uniform magnetostatic field; In this space, form the gradient magnetic field coil that magnetic field tilts; The irradiation coil, on the atomic nucleus of the atom of the tissue that constitutes the examinee, the high frequency magnetic field of irradiation and this nuclear resonance frequency same frequency; Reception is by the receiving coil of the NMR signal of examinee's generation; Graphics processing unit carries out signal processing to the NMR signal that is received by this receiving coil, and above-mentioned examinee's layer image is carried out image reconstructs computing; And image-display units, showing the layer image that has carried out the reconstituted above-mentioned examinee of image by this graphics processing unit, this MRI device is characterised in that,
Offering the leaning magnetic field power supply of above-mentioned gradient magnetic field coil, is any described power-converting device in the claim 1～4.
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| CN102340147A (en) * | 2011-08-12 | 2012-02-01 | 东华大学 | A Method of Weakening the Impact of CT Starting on Power Grid |
| EP2568589B1 (en) * | 2011-09-08 | 2013-11-13 | ABB Technology AG | Multilevel converter comprising an active AC-DC converter and a resonant DC-DC converter and a control method for operating a multilevel converter |
| JP6472592B2 (en) * | 2012-04-18 | 2019-02-20 | キヤノンメディカルシステムズ株式会社 | Magnetic resonance imaging apparatus and magnetic resonance imaging method |
| CN104904322B (en) * | 2013-01-10 | 2017-03-15 | 东芝医疗系统株式会社 | X-ray computed tomograohy apparatus and X-ray generator |
| JP6006670B2 (en) * | 2013-04-04 | 2016-10-12 | 日本電信電話株式会社 | Information communication terminal device degradation status judgment system |
| JP5931148B2 (en) | 2014-09-10 | 2016-06-08 | ファナック株式会社 | PWM rectifier with capacitance calculator |
| CN109642918B (en) * | 2016-08-24 | 2021-03-09 | 东芝三菱电机产业系统株式会社 | Power-on evaluation test device of input filter for pulse width modulation converter |
| JP6884029B2 (en) * | 2017-05-09 | 2021-06-09 | 株式会社日立製作所 | Power converter and diagnostic method of power converter |
| WO2019126062A1 (en) * | 2017-12-20 | 2019-06-27 | Dean Craig S | Digital high voltage power supply |
| CN110579720B (en) * | 2018-06-08 | 2022-08-30 | 台达电子工业股份有限公司 | Power supply monitor |
| JP6690842B1 (en) * | 2019-01-15 | 2020-04-28 | 東芝エレベータ株式会社 | Elevator main circuit diagnostic device |
| CN109900461B (en) * | 2019-02-27 | 2020-12-01 | 东软医疗系统股份有限公司 | Method and device for testing safety of CT rotating plate |
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| JP2535543B2 (en) * | 1987-06-27 | 1996-09-18 | シャープ株式会社 | Digital IQ demodulation system |
| JP3324239B2 (en) * | 1993-12-01 | 2002-09-17 | 富士電機株式会社 | Inverter device |
| JP3200307B2 (en) * | 1994-10-26 | 2001-08-20 | リズム時計工業株式会社 | Power supply life monitoring device for surveillance camera and notification method of power supply maintenance |
| JPH105189A (en) * | 1996-06-25 | 1998-01-13 | Hitachi Medical Corp | Power power unit for magnetic resonance imaging device |
| JP4318779B2 (en) * | 1999-03-03 | 2009-08-26 | 株式会社日立メディコ | Inverter X-ray high voltage device |
| JP2002165357A (en) * | 2000-11-27 | 2002-06-07 | Canon Inc | Power converter and its control method, and power generating system |
| JP2003070185A (en) * | 2001-08-28 | 2003-03-07 | Toshiba Corp | Power converter monitor |
| JP2003079132A (en) * | 2001-08-31 | 2003-03-14 | Hitachi Kokusai Electric Inc | Electronic equipment |
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| WO2005088814A1 (en) | 2005-09-22 |
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