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WO2019102937A1 - Circuit de filtre de bruit et circuit d'alimentation électrique - Google Patents

Circuit de filtre de bruit et circuit d'alimentation électrique Download PDF

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Publication number
WO2019102937A1
WO2019102937A1 PCT/JP2018/042418 JP2018042418W WO2019102937A1 WO 2019102937 A1 WO2019102937 A1 WO 2019102937A1 JP 2018042418 W JP2018042418 W JP 2018042418W WO 2019102937 A1 WO2019102937 A1 WO 2019102937A1
Authority
WO
WIPO (PCT)
Prior art keywords
common mode
noise
circuit
mode choke
power supply
Prior art date
Application number
PCT/JP2018/042418
Other languages
English (en)
Japanese (ja)
Inventor
浩志 北田
耕太 斉藤
寛之 高辻
直通 榎
由浩 今西
Original Assignee
株式会社村田製作所
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 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2019102937A1 publication Critical patent/WO2019102937A1/fr

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Classifications

    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc 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
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac 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
    • 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 noise filter circuit and a power supply circuit, and more particularly to a noise filter circuit that reduces common mode noise of a power conversion circuit, and a power supply circuit using the noise filter circuit.
  • a common mode choke coil in which the winding is wound in the same direction, and between the power line and ground A noise filter circuit is used which is composed of a Y capacitor connected to.
  • Patent Document 1 discloses a power supply unit in which two stages of a filter circuit composed of a common mode choke coil and a Y capacitor are provided at the front stage of an inverter circuit (switching circuit) for driving a DC brushless motor. There is.
  • connection portion of the Y capacitor constituting one of the filter circuits is connected to the ground terminal through the ground pattern of the printed circuit board, and the common mode noise is released to the ground side. Further, the connection portion of the Y capacitor constituting the other filter circuit is connected to the ground terminal through the ground wire, and the noise is dissipated to the ground side. Then, in this power supply unit, by arranging the ground line of the other filter circuit to be separated from the power supply line of the printed circuit board, radiation noise generated from the ground line can be propagated to the power supply line on the printed circuit board. It is suppressing.
  • common mode noise transmitted from the inverter circuit side does not pass through the common mode choke coil through the Y capacitor forming the (other) filter circuit on the inverter circuit side ( That is, there is a risk that the noise level may be escaped to the ground).
  • common mode noise transmitted to the ground may be transmitted to the power supply line without passing through the common mode choke coil via the Y capacitor (that is, without reducing the noise level).
  • switching noise generated on the inverter circuit (switching circuit) side may be transmitted to the power supply side through the ground.
  • the present invention has been made to solve the above problems, and is a noise filter capable of further reducing common mode noise of a power conversion circuit in which the ground on the input side and the ground on the output side are common. It is an object of the present invention to provide a circuit and a power supply circuit.
  • the noise filter circuit according to the present invention is characterized by comprising a pair of common mode choke coils connected in series to the power line, and a Y capacitor connected only between the pair of common mode choke coils.
  • a power supply circuit includes the noise filter circuit and a power conversion circuit.
  • FIG. 1 is a circuit diagram showing a configuration of a power supply circuit 3 using a noise filter circuit 1.
  • the power supply circuit 3 includes a noise filter circuit 1 and a power conversion circuit 10.
  • the noise filter circuit 1 is a power supply EMC filter that reduces common mode noise and normal mode noise (differential mode noise) of the power conversion circuit 10.
  • the noise filter circuit 1 is connected in series to the AC lines 11 and 12 (corresponding to the power lines described in the claims) on the output side (AC side) of the power conversion circuit 10 in order to reduce common mode noise.
  • the noise filter circuit 1 is connected between the inductors 21 and 22 connected in series to the AC lines 11 and 12 and between the AC lines 11 and 12 in order to reduce normal mode noise (differential mode noise).
  • the X capacitors 41 and 42 are provided. Each component will be described in more detail below.
  • the power conversion circuit 10 has a switching element, and converts, for example, the voltage or frequency of the power input from the input side, and outputs the converted voltage to the output side.
  • Examples of the power conversion circuit 10 include a DC-DC converter, an AC-AC converter, an AC-DC converter, a DC-AC converter, and an inverter circuit.
  • the power conversion circuit 10 is applied to a DC-AC converter.
  • the ground on the input side (DC side) of the power conversion circuit 10 and the ground on the output side (AC side) are common (electrically connected).
  • An inductor 21 and an inductor 22 are connected in series to each of the pair of AC lines 11 and 12 on the output side (AC side) of the power conversion circuit 10. Further, an X capacitor 41 is connected between the pair of AC lines 11 and 12. A differential mode filter (LC filter) is configured by the inductor 21, the inductor 22, and the X capacitor 41. Further, an X capacitor 42 is connected between the pair of AC lines 11 and 12 also on the downstream side of a common mode choke coil 32 described later. The X capacitors 41 and 42 are capacitors connected between the AC lines 11 and 12 in order to reduce normal mode noise (differential mode noise).
  • LC filter differential mode filter
  • a pair (two) common mode choke coil 31 and a common mode choke coil 32 are connected in series on the downstream side (rear stage) of the X capacitor 41. It is connected to the.
  • Each of the common mode choke coil 31 and the common mode choke coil 32 is formed by winding a pair of windings in the same direction, and has a high common mode impedance and a low normal mode (differential mode) impedance.
  • the common mode choke coils 31 and 32 for example, a well-known winding type common mode choke coil or a laminated common mode choke coil can be suitably used.
  • Y capacitors 501 and 502 are connected to the AC lines 11 and 12 between the pair (two) common mode choke coils 31 and 32 (only to the AC lines 11 and 12 therebetween). That is, no Y capacitor is provided on the upstream side (the power conversion circuit 10 side) of the common mode choke coil 31 and on the downstream side of the common mode choke coil 32. That is, the Y capacitors 501 and 502 are disposed so as to be sandwiched between the common mode choke coil 31 and the common mode choke coil 32. In other words, common mode choke coils are disposed upstream and downstream of the Y capacitors 501 and 502, respectively.
  • the Y capacitors 501 and 502 are capacitors connected between the AC lines 11 and 12 and the ground in order to reduce common mode noise.
  • the common mode noise transmitted through the AC lines 11 and 12 must be the common mode choke coil 32 or the common before it is released to the ground through the Y capacitors 501 and 502. It passes through the mode choke coil 31 (that is, common mode noise is reduced). In addition, even when common mode noise transmitted to the ground is transmitted to the AC lines 11 and 12 through the Y capacitors 501 and 502, it passes through the common mode choke coil 32 or 31 (common mode noise is weakened). It will be.
  • LISN Line Impedance Stabilizing Network
  • FIG. 2 is a graph showing measurement results of noise levels when the noise filter circuit 1 according to the present embodiment and the noise filter circuit according to the comparative example shown in FIG. 4 are used.
  • the upper graph in FIG. 2 shows the noise level of the L1 phase (ACV side).
  • the horizontal axis of this graph is frequency (MHz), and the vertical axis is noise level (dB ⁇ V).
  • the lower graph in FIG. 2 shows the noise level on the positive side (DCV side).
  • the horizontal axis of this graph is frequency (MHz), and the vertical axis is noise level (dB ⁇ V).
  • Y disposed on the upstream side (power change circuit 10 side) of the common mode choke coil 31
  • a noise filter circuit having capacitors 511 and 512 and Y capacitors 521 and 522 disposed downstream of the common mode choke coil 32 was used.
  • the noise level of the L1 phase (ACV side) is also positive (compared to the noise filter circuit according to the comparative example). It has been confirmed that the noise level on the DCV side also decreases over the entire frequency range. Moreover, according to the noise filter circuit 1 which concerns on this embodiment, it was confirmed that it is less than the limit value (CISPR11ClassA) in the whole region (it is satisfied).
  • CISPR Comite International Special Perturbations Radio hereby
  • FIG. 3 shows the noise filter circuit 1 according to this embodiment, the comparative example 1 (only the Y capacitors 511 and 512 shown in FIG. 4), and the comparative example 2 (Y capacitors 521 and 522 shown in FIG. 4).
  • the upper graph in FIG. 3 shows the noise level of the common mode on the ACV side.
  • the horizontal axis of this graph is frequency (MHz) and the vertical axis is noise level (dB ⁇ A).
  • the lower graph in FIG. 3 shows the noise level of the common mode on the DCV side.
  • the horizontal axis of this graph is frequency (MHz) and the vertical axis is noise level (dB ⁇ A).
  • the conducted noise (voltage) measured by the LISN is a noise in which the common mode noise and the normal mode noise are added, but the common mode noise at this time is either the higher noise level noise (for example, when the common mode noise on the AC side is high on the AC side and the DC side, the common mode noise on the AC side is obtained. Therefore, for example, even if a Y capacitor is inserted on the AC side to reduce the common mode noise level on the AC side, if the noise level on the DC side increases, the noise level measured by LISN will hardly change . That is, to reduce the noise level measured by the LISN, it is necessary to reduce common mode noise on both the AC side and the DC side, and it is required to reduce the noise conducted to the ground through the Y capacitor. Also from this, it was confirmed that the configuration of the filter circuit 1 according to the present embodiment is optimal.
  • the Y capacitors 501 and 502 are connected only to the AC lines 11 and 12 between the pair of (two) common mode choke coils 31 and 32. Therefore, common mode noise transmitted through the AC lines 11 and 12 always passes through the common mode choke coil 31 or the common mode choke coil 32 before being released to the ground via the Y capacitors 501 and 502 (common mode noise is weakened). It will be. In addition, even when common mode noise transmitted to the ground is transmitted to the AC lines 11 and 12 through the Y capacitors 501 and 502, it passes through the common mode choke coil 32 or 31 (common mode noise is weakened). It will be.
  • common mode noise is escaped to the ground through Y capacitors 501 and 502 without passing through common mode choke coils 31 and 32, and common mode noise transmitted through the ground causes common mode choke coils 31 and 32 to It can be prevented from being transmitted to the AC lines 11 and 12 through the Y capacitors 501 and 502 without passing through.
  • common mode noise of the power conversion circuit 10 in which the ground on the input side and the ground on the output side are common can be further reduced.
  • common mode noise switching noise generated by the switching operation of the switching elements constituting the power conversion circuit 10 can be effectively reduced.
  • the present invention is applied to a DC-AC converter as an example, the present invention has a switching element and converts voltage or frequency of input power and the like.
  • the present invention can also be applied to a power conversion circuit that outputs, for example, a DC-DC converter, an AC-DC converter, an inverter circuit (motor driver circuit), and the like.
  • noise filter circuit 1 is provided on the output side (AC side) of the power conversion circuit 10 in the above embodiment, the noise filter circuit 1 may be provided on the input side (DC side) of the power conversion circuit 10.
  • the number of common mode choke coils may be three or more.
  • the number of common mode choke coils is three is shown in FIG.
  • the Y capacitors 501 and 502 and the Y capacitors 503 and 504 are connected only to the power lines 11 and 12 between the three common mode choke coils 31, 32 and 33, respectively.
  • common mode noise is dissipated to the ground through the Y capacitors 501 and 502 and the Y capacitors 503 and 504 without passing through the common mode choke coils 31, 32 and 33, and Common mode noise that is transmitted to the AC lines 11 and 12 of the power conversion circuit 10 through the Y capacitors 501 and 502 and the Y capacitors 503 and 504 without passing through the common mode choke coils 31, 32 and 33. it can. Furthermore, in this case, the noise reduction effect of the common mode noise can be further enhanced by forming the common mode choke coils 31, 32, 33, the Y capacitors 501, 502 and the Y capacitors 503, 504 in multiple stages.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Filters And Equalizers (AREA)
  • Power Conversion In General (AREA)

Abstract

Un circuit de filtre de bruit (1) comprend : une paire (deux) de bobines d'arrêt en mode commun (31, 32) connectées en série à des lignes de courant alternatif (11, 12) sur le côté de sortie d'un circuit de conversion de puissance (10) dans lequel la masse côté entrée (côté CC) et la masse côté sortie (côté CA) sont une masse partagée ; et des condensateurs Y (501, 502) uniquement connectés aux lignes CA (11, 12) entre la paire de bobines d'arrêt en mode commun (31, 32).
PCT/JP2018/042418 2017-11-22 2018-11-16 Circuit de filtre de bruit et circuit d'alimentation électrique WO2019102937A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-224407 2017-11-22
JP2017224407 2017-11-22

Publications (1)

Publication Number Publication Date
WO2019102937A1 true WO2019102937A1 (fr) 2019-05-31

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Application Number Title Priority Date Filing Date
PCT/JP2018/042418 WO2019102937A1 (fr) 2017-11-22 2018-11-16 Circuit de filtre de bruit et circuit d'alimentation électrique

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020250275A1 (fr) * 2019-06-10 2020-12-17 三菱電機株式会社 Circuit de filtrage de bruit

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4999594A (en) * 1988-12-09 1991-03-12 Condor, Inc. AC line filter with tapped balun winding
JPH05292668A (ja) * 1992-04-13 1993-11-05 Mels Corp ノイズフィルター
JPH07256149A (ja) * 1994-03-25 1995-10-09 Hitachi Koki Co Ltd 遠心機用モータの制御装置
JP2000102242A (ja) * 1998-09-14 2000-04-07 Abb Ind Oy 伝導妨害の除去を最適化する方法および装置
JP2001157441A (ja) * 1999-11-24 2001-06-08 Sanken Electric Co Ltd 電力変換装置
JP2007214789A (ja) * 2006-02-08 2007-08-23 Tdk Corp 複合コイルおよびノイズフィルタ
JP2016152642A (ja) * 2015-02-16 2016-08-22 Tdk株式会社 制御回路およびスイッチング電源装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4999594A (en) * 1988-12-09 1991-03-12 Condor, Inc. AC line filter with tapped balun winding
JPH05292668A (ja) * 1992-04-13 1993-11-05 Mels Corp ノイズフィルター
JPH07256149A (ja) * 1994-03-25 1995-10-09 Hitachi Koki Co Ltd 遠心機用モータの制御装置
JP2000102242A (ja) * 1998-09-14 2000-04-07 Abb Ind Oy 伝導妨害の除去を最適化する方法および装置
JP2001157441A (ja) * 1999-11-24 2001-06-08 Sanken Electric Co Ltd 電力変換装置
JP2007214789A (ja) * 2006-02-08 2007-08-23 Tdk Corp 複合コイルおよびノイズフィルタ
JP2016152642A (ja) * 2015-02-16 2016-08-22 Tdk株式会社 制御回路およびスイッチング電源装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020250275A1 (fr) * 2019-06-10 2020-12-17 三菱電機株式会社 Circuit de filtrage de bruit

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