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WO2016031299A1 - Dispositif médical - Google Patents

Dispositif médical Download PDF

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Publication number
WO2016031299A1
WO2016031299A1 PCT/JP2015/062175 JP2015062175W WO2016031299A1 WO 2016031299 A1 WO2016031299 A1 WO 2016031299A1 JP 2015062175 W JP2015062175 W JP 2015062175W WO 2016031299 A1 WO2016031299 A1 WO 2016031299A1
Authority
WO
WIPO (PCT)
Prior art keywords
medical device
resonance
capacitor
inductor
frequency
Prior art date
Application number
PCT/JP2015/062175
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English (en)
Japanese (ja)
Inventor
船戸　裕樹
浩和 飯嶋
高橋　昌義
Original Assignee
株式会社日立メディコ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社日立メディコ filed Critical 株式会社日立メディコ
Publication of WO2016031299A1 publication Critical patent/WO2016031299A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]
    • 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
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H5/00—One-port networks comprising only passive electrical elements as network components
    • H03H5/02—One-port networks comprising only passive electrical elements as network components without voltage- or current-dependent elements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/09—Filters comprising mutual inductance

Definitions

  • the present invention relates to a medical device.
  • Patent Document 1 JP 2007-325377 A (Patent Document 1) as background art in this technical field. This publication describes that “a power converter capable of preventing a resonance phenomenon and reducing a common mode voltage of a bus line in a bidirectional converter” is provided.
  • Patent Document 2 states that “improvement of attenuation characteristics for noise components in a band equal to or higher than the self-resonance frequency of the common mode reactor while ensuring a bypass path for high frequency components”. Are listed.
  • EMC Electromagnetic Compatibility
  • One of the EMC standard tests is a conduction noise test, and the device must reduce the noise induced in the power supply line to a regulation value or less.
  • a method is generally used in which a conduction noise of the power line is caused to flow to the ground by installing a filter between the power line and the ground.
  • ground leakage current test the current flowing in the ground wire connecting the equipment and the power source must be less than the regulation value. In order to reduce the ground leakage current, it is important to design so that no current flows from the power line to the ground.
  • An object of the present invention is to provide a medical device that reduces power line noise to meet EMC conduction noise regulations and reduces leakage current to meet leakage current regulations.
  • a medical device including an AC power source and a power converter having a switching element connected to the AC power source.
  • a series resonance capacitor provided between a power supply line connecting the AC power supply and the power converter, and the device GND, a GND side terminal of the series resonance capacitor, and the device GND
  • a resonance inductor provided so as to be connected in series with the series resonance capacitor, and a high frequency noise bypass capacitor provided so as to be connected in parallel with the resonance inductor.
  • the resonance frequency of the capacitor for resonance and the resonance inductor is set to match the switching frequency of the power converter
  • Parallel resonance frequency of the high frequency noise bypass capacitor is characterized in that it is set to a value between the switching frequency and conduction noise restriction start frequency.
  • the present invention it is possible to provide a medical device that reduces power line noise in order to comply with EMC conduction noise regulations and reduces leakage current in order to conform to leakage current regulations.
  • FIG. 1 shows a configuration of a power supply device of a medical device according to an embodiment of the present invention.
  • a CT Computer Planar Tomography
  • the medical device is connected to a three-phase AC power supply 101, and the three-phase AC power supply line is connected to a converter 103 that is a power converter for generating a DC voltage from the AC power supply through a filter 102 for blocking noise. It is connected.
  • the power converter refers to a converter only or a configuration including a converter unit.
  • the DC voltage generated by the converter 103 is supplied to the inverter 105 via the high voltage wiring laid on the slip ring 104.
  • the high voltage generated by the inverter 105 is supplied to the X-ray tube and used to generate X-rays.
  • the converter 103 and the inverter 105 obtain a desired voltage and current waveform by performing a switching operation using a switching element for high voltage such as IGBT.
  • the inverter and the converter are generally mounted on a metal frame or casing, and the frame or casing is grounded on the power supply side via the ground wire 106.
  • the frame and the casing are electrically connected to the power supply ground (ground), and become the device GND (ground) 107.
  • the three-phase power supply is 50 Hz / 60 Hz, and the voltage varies depending on the device specifications such as 100 V to 400 V and the use of the power supply.
  • the switching frequency of the converter 103 and the inverter 105 is about several kHz to several tens of kHz.
  • the switching operation of the converter 103 generates harmonic noise of the switching frequency.
  • the generated noise propagates to the power supply side via the power supply line.
  • the noise filter is provided to suppress the conduction noise generated in the device.
  • the types of filters can be broadly classified into active filters and passive filters.
  • active filters have a relatively complicated circuit configuration, so that they are expensive and difficult to apply to power lines such as power lines.
  • the passive filter has a relatively simple configuration, is low in cost, and can be easily applied to a power line. Therefore, in this embodiment, a passive filter is mounted. Inductance and capacitance are used as elements constituting the passive filter.
  • ⁇ Inductance has the effect of increasing the high frequency impedance and suppressing noise propagation by inserting it in series with the power line.
  • a method for realizing the inductance for example, there are methods such as forming a power supply line in a coil shape and using a magnetic material such as ferrite.
  • the capacitance has an effect of bypassing only the high-frequency current to the GND by being inserted between the power supply line and the device GND. For this reason, a wire and an element with a small current value and a small current capacity can be used, and the size and cost can be suppressed.
  • EMC regulation and ground leakage current regulation will be described.
  • the conduction noise test regulates the amount of conduction noise that propagates to the power supply.
  • the frequency range of conduction noise regulation for medical devices is 150 kHz to 30 MHz.
  • the frequency that is the starting point (lower end value) in the frequency range subject to conduction noise regulation is defined as the conduction noise regulation start frequency.
  • an ammeter is used to regulate the current value flowing through the ground wire connecting the device and the power source ground.
  • the ground leakage current of a medical device must be 5 mA or less.
  • the ammeter used for measurement is defined as having a bandwidth of 1 MHz.
  • a noise filter is provided in consideration of this.
  • this noise filter shall be mounted between the converter 103 which is a three-phase alternating current power supply 101 and a power converter.
  • a series resonance capacitor (Cy) 201 is mounted between each phase of the power supply line of the three-phase AC power supply 101 and the device GND 107, and a resonance inductor (Lp) 202 is connected between the terminal connecting the three phases and the device GND 107.
  • a high frequency noise bypass capacitor (Cp) 203 connected in parallel with the inductor 202 is provided.
  • the series resonance capacitor, the resonance inductor, and the high frequency noise bypass capacitor may be mounted on a substrate included in the power converter, or may be mounted on a substrate dedicated to a noise filter.
  • the power converter substrate or the noise filter dedicated substrate is provided with a power supply connection terminal and a GND connection terminal.
  • the power converter is mounted on a substrate, it is not necessary to provide a filter substrate in particular, so that the cost can be reduced.
  • the presence or absence of the filter can be easily changed by attaching and detaching the noise filter dedicated substrate according to the situation.
  • the series resonance frequency of the capacitor 201 and the inductor 202 is adjusted to the switching frequency of the converter 103, for example, 10 kHz.
  • the impedance between the power supply line and the ground becomes small at the switching frequency of the converter 103, the switching current can be bypassed to the device GND 107, and the leakage noise to the outside of the device can be reduced.
  • the impedance between the power supply line and the device GND 107 can be kept high at a frequency lower than the series resonance frequency set as described above. That is, the switching current of the converter 103 can be bypassed to the device GND 107, and the amount of power source frequency (50 Hz / 60 Hz) current flowing to the device GND 107 can be reduced.
  • the capacitor 203 is set so that the parallel resonance frequency of the inductor 202 and the capacitor 203 is equal to or higher than the switching frequency of the converter 103 (that is, the series resonance frequency of the inductor 202 and the capacitor 201) and less than 150 kHz, which is the EMC conduction noise regulation start frequency.
  • this filter has a capacitive impedance characteristic in a band equal to or higher than the parallel resonance frequency of the inductor 202 and the capacitor 203, and the ground impedance of the power supply line can be lowered at 150 kHz or higher.
  • FIG. 3 shows definitions of terminals for calculating the filter characteristics of this embodiment.
  • the characteristic obtained by the terminal definition in FIG. 3A is herein referred to as a normal mode characteristic.
  • the characteristic obtained in FIG. 3B is a common mode characteristic.
  • the normal mode characteristic is a component in which current is input from one or two phases of the three-phase power supply line and is also output from one or two phases, and does not leak to the GND line.
  • the common mode characteristic is a component that is input from the three-phase power supply line and leaks to the GND line. That is, the definition of the input / output terminal in FIG. 3A is a normal mode characteristic, and FIG. 3B represents a common mode characteristic.
  • Fig. 4 shows the results of calculating the filter characteristics of this example.
  • the inductor (Lp) 202 3 mH
  • the capacitor (Cy) 201 25 nF
  • the capacitor (Cp) 203 5 nF.
  • the switching frequency of converter 103 is assumed to be 10 kHz
  • the series resonance frequency of inductor 202 and capacitor 201 is 10 kHz.
  • FIG. 5 shows a configuration of a noise filter for suppressing noise due to anti-resonance in the second embodiment. That is, a method for controlling the quality factor, that is, the Q value, representing the sharpness of resonance by the inductor 202 (Lp) and the capacitor 203 (Cp) in the resonance type filter of the present embodiment is provided.
  • the quality factor that is, the Q value
  • the parallel resonance frequency of the inductor Lp and the capacitor Cp is not less than the switching frequency of the converter and less than the EMC conduction noise regulation start frequency (150 kHz), but the converter noise is not bypassed near the parallel resonance frequency, The amount of propagation to the power supply side increases.
  • the resistor 501 (R) is inserted in parallel with the inductor 202 or connected in series.
  • the Q value of the parallel resonance can be lowered, thereby reducing the ground impedance.
  • the resistance value is set so that the ground impedance in parallel resonance is less than the desired value. Thereby, the impedance of the parallel resonant frequency of the inductor Lp and the capacitor Cp can be lowered, and the conduction noise can be reduced.
  • Fig. 6 shows the configuration of a noise filter that forms a resonance circuit for each phase of the power line.
  • the impedance between the phases also has resonance characteristics.
  • the phases of the power supply lines are connected by the capacitors 201 (Cy), and this has the effect of suppressing normal mode noise generated between the phases. If it occurs, it can be a path to propagate to other phases.
  • the series resonance frequency of the capacitor Cy and the inductor Lp is set to the switching frequency of a noise source such as a converter
  • the parallel resonance frequency of the capacitor Cp and the inductor Lp is set higher than the switching frequency of the noise source
  • the EMC regulation frequency By making it lower than 150 kHz, it is possible to reduce the leakage current in order to meet the leakage current regulation while reducing the power line noise to meet the EMC conduction noise regulation.
  • Fig. 7 shows the configuration of a noise filter using inductive coupling with a magnetic material such as a ferrite core.
  • the inductor 202 (Lp) connected to each of the power supply three-phase lines is inductively coupled using a magnetic material so that the magnetic fields generated by the currents of the respective phases are coupled in phase with each other, thereby causing the inductors 202 of the respective phases.
  • Inductance is generated only in the in-phase (common mode) component of the current flowing through the.
  • resonance by the capacitor 201 (Cy) and the inductor 202 can be generated only for the common mode component, and no inductance is generated for components other than the common mode component (normal mode component). Functions as a capacitor.
  • This configuration is effective when the noise component to be bypassed to GND due to resonance can be identified as the common mode.
  • an inductor element it is not necessary to add an inductor element to each phase, and an inductor can be formed by using a magnetic material such as ferrite in three phases at a time, so that the number of parts can be reduced.
  • FIG. 8 illustrates a specific method for realizing the inductor Lp.
  • FIG. 8A shows an example using a coil component.
  • the substrate and components can be shared between different devices by separately providing a substrate on which the resonant circuit is mounted as shown in FIG.
  • FIG. 8B shows an example of a mounting method for realizing the inductor Lp using a magnetic material such as ferrite.
  • FIG. 8C shows an example in which the inductor Lp is realized by substrate wiring.
  • the cost can be reduced along with the number of parts.
  • the number of components can be further reduced by designing the spiral inductor with the capacitance between wires and realizing the capacitor Cp with the capacitance between wires instead of as a component.
  • FIG. 9 shows a configuration of an embodiment in which the value of the filter element is dynamically changed.
  • the main point of this embodiment is to match the switching frequency of the noise source (converter or the like) with the resonance circuit of the filter, but the switching frequency of the noise source may change depending on the state and operation of the apparatus.
  • a signal indicating the switching frequency is transmitted from the control block that outputs a signal of the switching frequency to the resonance filter circuit via the signal line, and the filter is configured such that the inductor Lp, the capacitor Cy, and the resonance frequency match the switching frequency.
  • the filter is configured such that the inductor Lp, the capacitor Cy, and the resonance frequency match the switching frequency.
  • variable inductor may be configured to switch the connection of a plurality of components or to use an equivalent inductor using a transistor or the like.
  • this invention is not limited to the above-mentioned Example, Various modifications are included.
  • the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
  • a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medical Informatics (AREA)
  • Power Engineering (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Biophysics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • Pathology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Physics & Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Filters And Equalizers (AREA)
  • Power Conversion In General (AREA)
  • Inverter Devices (AREA)
  • Apparatus For Radiation Diagnosis (AREA)

Abstract

　La présente invention concerne un dispositif médical pourvu d'une alimentation en courant alternatif et d'un convertisseur de puissance qui comporte un élément de commutation connecté à l'alimentation en courant alternatif. Ledit dispositif médical est caractérisé en ce qu'il est pourvu d'un condensateur à résonance série (201) prévu entre la masse de dispositif et une ligne d'alimentation électrique qui connecte l'alimentation en courant alternatif et le convertisseur de puissance, d'un inducteur à résonance (202) prévu afin d'être connecté en série avec le condensateur à résonance série entre la borne côté masse du condensateur à résonance série et la masse de dispositif, et d'un condensateur de dérivation de bruit à haute fréquence (203) prévu afin d'être connecté en parallèle à l'inducteur à résonance ; la fréquence de résonance du condensateur à résonance série et de l'inducteur à résonance étant réglée afin de correspondre à la fréquence de commutation du convertisseur de puissance, et la fréquence de résonance parallèle de l'inducteur à résonance et du condensateur de dérivation de bruit à haute fréquence étant réglée à une valeur entre la fréquence de commutation et la fréquence de commencement de limitation de bruit de conduction. La présente invention permet de réduire les courants de fuite tout en réduisant le bruit de ligne d'alimentation électrique.
PCT/JP2015/062175 2014-08-29 2015-04-22 Dispositif médical WO2016031299A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-174753 2014-08-29
JP2014174753A JP6239468B2 (ja) 2014-08-29 2014-08-29 医療装置

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017158783A1 (fr) * 2016-03-17 2017-09-21 三菱電機株式会社 Dispositif de conversion de puissance et dispositif de climatisation l'utilisant

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018014263A (ja) * 2016-07-21 2018-01-25 株式会社日立製作所 Ｘ線高電圧装置及びｘ線撮像装置
DE102018010146A1 (de) * 2018-12-24 2020-06-25 Finepower Gmbh Vorrichtung zur Filterung von hochfrequenten Störspannungen in einer Schaltung zur Leistungsfaktorkorrektur

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08126201A (ja) * 1994-10-19 1996-05-17 Meidensha Corp キャリア成分抑制方法
JP2006060928A (ja) * 2004-08-20 2006-03-02 Yaskawa Electric Corp ノイズフィルタ装置およびノイズフィルタ装置装着インバータ装置
JP2006165830A (ja) * 2004-12-06 2006-06-22 Renesas Technology Corp 電子装置、ローパスフィルタ、および電子装置の製造方法
JP2008148523A (ja) * 2006-12-13 2008-06-26 Fuji Electric Holdings Co Ltd ノイズフィルタ回路
JP2008245037A (ja) * 2007-03-28 2008-10-09 Fuji Electric Holdings Co Ltd ノイズフィルタ
WO2011021485A1 (fr) * 2009-08-19 2011-02-24 株式会社安川電機 Filtre de sortie, et système d'entraînement de moteur électrique équipé du filtre
JP2012044812A (ja) * 2010-08-20 2012-03-01 Fuji Electric Co Ltd ノイズフィルタ及びこれを使用したｅｍｃフィルタ
US20130083571A1 (en) * 2011-09-29 2013-04-04 Delta Electronics (Shanghai) Co., Ltd Three-phase rectification module, the system thereof and harmonic suppression method
JP2014050260A (ja) * 2012-08-31 2014-03-17 Fuji Electric Co Ltd 電力変換装置

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08126201A (ja) * 1994-10-19 1996-05-17 Meidensha Corp キャリア成分抑制方法
JP2006060928A (ja) * 2004-08-20 2006-03-02 Yaskawa Electric Corp ノイズフィルタ装置およびノイズフィルタ装置装着インバータ装置
JP2006165830A (ja) * 2004-12-06 2006-06-22 Renesas Technology Corp 電子装置、ローパスフィルタ、および電子装置の製造方法
JP2008148523A (ja) * 2006-12-13 2008-06-26 Fuji Electric Holdings Co Ltd ノイズフィルタ回路
JP2008245037A (ja) * 2007-03-28 2008-10-09 Fuji Electric Holdings Co Ltd ノイズフィルタ
WO2011021485A1 (fr) * 2009-08-19 2011-02-24 株式会社安川電機 Filtre de sortie, et système d'entraînement de moteur électrique équipé du filtre
JP2012044812A (ja) * 2010-08-20 2012-03-01 Fuji Electric Co Ltd ノイズフィルタ及びこれを使用したｅｍｃフィルタ
US20130083571A1 (en) * 2011-09-29 2013-04-04 Delta Electronics (Shanghai) Co., Ltd Three-phase rectification module, the system thereof and harmonic suppression method
JP2014050260A (ja) * 2012-08-31 2014-03-17 Fuji Electric Co Ltd 電力変換装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017158783A1 (fr) * 2016-03-17 2017-09-21 三菱電機株式会社 Dispositif de conversion de puissance et dispositif de climatisation l'utilisant

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