JP2019041290A - Current source drive type disturbing wave suppression filter - Google Patents
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Abstract
Description
本発明は、コモンモードの妨害波を抑制する電流源駆動型妨害波抑制フィルタに関する。 The present invention relates to a current source driven interference wave suppression filter that suppresses common mode interference waves.
電子機器が発生するコモンモードの妨害波の電流（以下、コモンモード電流と呼ぶ）が平衡伝送線路を伝搬し、他の電子機器へ干渉することがある。この伝搬を抑制するためには、前記コモンモードの妨害波の対策を可能にするフィルタ（以下、コモンモードフィルタと呼ぶ）が必須である。 A current of a common mode interference wave generated by an electronic device (hereinafter referred to as a common mode current) may propagate through the balanced transmission line and interfere with other electronic devices. In order to suppress this propagation, a filter (hereinafter referred to as a common mode filter) that enables countermeasures against the common mode interference wave is essential.
従来では、上記コモンモードフィルタとして、例えばコモンモードの妨害波を発生する前記電子機器を動作させたまま前記妨害波の対策を可能とする、外付けフェライトコアを用いたフィルタが幅広く用いられている。 Conventionally, as the common mode filter, for example, a filter using an external ferrite core that enables countermeasures against the interference wave while operating the electronic device that generates the interference wave of the common mode is widely used. .
フェライトコアとは、フェライト製の磁性体であり、ドーナツ状の円環形状を有する。このフェライトコアの両側に電源線や導線を巻き付けることで一次側のコイルと二次側のコイルとから成るトランスが構成される。 The ferrite core is a magnetic substance made of ferrite and has a donut-shaped annular shape. A transformer composed of a primary coil and a secondary coil is formed by winding a power line or a conductive wire around both sides of the ferrite core.
また、２つのフェライトコアと帰還型増幅回路とを組み合わせ、この帰還型増幅回路による負帰還増幅によって得られる逆起電力を、コモンモードの妨害波を抑制する方向に発生させるコモンモード妨害波抑制フィルタも提案されている（例えば、非特許文献１参照。）。 Also, a common mode interference wave suppression filter that combines two ferrite cores and a feedback amplifier circuit, and generates a back electromotive force obtained by negative feedback amplification by the feedback amplifier circuit in a direction to suppress common mode interference waves. Has also been proposed (see Non-Patent Document 1, for example).
具体的には、一方のフェライトコアの一次側に巻き付けた電源線に重畳して伝搬するコモンモード電流により、当該フェライトコアの二次側に巻き付けた導線に誘起される電圧を前記帰還型増幅回路に印加し、この印加された電圧に応じた電流を他方のフェライトコアの一次側に巻き付けた導線に流すことで、当該一次側の導線に電圧を発生させる。 Specifically, a voltage induced in a conducting wire wound on the secondary side of the ferrite core by a common mode current propagating superimposed on a power supply wire wound on the primary side of one ferrite core is converted into the feedback amplification circuit. And a current corresponding to the applied voltage is caused to flow through a conducting wire wound around the primary side of the other ferrite core, thereby generating a voltage in the conducting wire on the primary side.
これによって前記他方のフェライトコアの二次側に巻き付けた前記電源線に、当該電源線に重畳するコモンモードの妨害波を打ち消すような方向に電圧を誘起させることで、前記コモンモードの妨害波を抑制する。 As a result, a voltage is induced in the power line wound around the secondary side of the other ferrite core in a direction that cancels the common mode disturbance wave superimposed on the power line, thereby causing the common mode disturbance wave to Suppress.
このコモンモード妨害波抑制フィルタでは、フェライトコアに巻き付ける導線の巻数を最適化することで２．５×１０５〜２．０×１０６［Ｈｚ］の広い帯域幅にて前記コモンモードの妨害波を抑制させることが可能であるが、さらに低周波帯域におけるコモンモードの妨害波の抑制には至っていない。 In this common mode jamming wave suppression filter, the common mode jamming wave can be obtained with a wide bandwidth of 2.5 × 10 5 to 2.0 × 10 6 [Hz] by optimizing the number of turns of the conductive wire wound around the ferrite core. However, it has not yet been possible to suppress common mode interference waves in the low frequency band.
非特許文献１のコモンモード妨害波抑制フィルタを用いて低周波帯域にて前記妨害波の抑制を行う場合、前記他方のフェライトコアの一次側と二次側との間の相互インダクタンスが低下しても当該二次側の電源線に前記コモンモードの妨害波を打ち消す十分な電圧を誘起させるためには、当該前記他方のフェライトコアの一次側に巻き付ける導線の回数を増加させる必要がある。 When the interference wave is suppressed in the low frequency band using the common mode interference wave suppression filter of Non-Patent Document 1, the mutual inductance between the primary side and the secondary side of the other ferrite core decreases. However, in order to induce a sufficient voltage to cancel the common mode interference wave in the secondary power line, it is necessary to increase the number of conductive wires wound around the primary side of the other ferrite core.
しかし、帰還型増幅回路の出力端がこの巻数が増加した前記導線に接続されるため、当該帰還型増幅回路の出力端からみた他方のフェライトコアのインピーダンスが上昇する。このため、当該フェライトコアの一次側に巻き付けられた導線に流れ込む電流が減少し、二次側に巻き付けられた電源線に誘起させる逆起電力が小さくなることから、当該電源線へ流れ込む前記コモンモードの妨害波を十分に抑制できないという課題が存在する。 However, since the output terminal of the feedback amplifier circuit is connected to the conducting wire having the increased number of turns, the impedance of the other ferrite core as viewed from the output terminal of the feedback amplifier circuit is increased. For this reason, the current flowing into the conducting wire wound around the primary side of the ferrite core is reduced, and the back electromotive force induced in the power source wire wound around the secondary side is reduced, so that the common mode flowing into the power source line is reduced. There is a problem that the interference wave cannot be sufficiently suppressed.
本発明は、上記課題に鑑みてなされたものであり、低周波帯域においてもコモンモードの妨害波の減衰量を保つことで妨害波の抑制を可能とする電流源駆動型妨害波抑制フィルタを提供することを目的とする。 The present invention has been made in view of the above problems, and provides a current source driven interference wave suppression filter capable of suppressing interference waves by maintaining the attenuation of common mode interference waves even in a low frequency band. The purpose is to do.
本発明に係る電流源駆動型妨害波抑制フィルタは、妨害源となる第１の電子機器から流出するコモンモード電流を検出し、当該コモンモード電流に起因した第１電圧を誘起する検出部と、前記検出部によって誘起された前記第１電圧と基準電位との差に応じた帰還電流を生成する帰還電流生成部と、前記帰還電流により前記第１電圧に一致する電圧を前記基準電位として生成する電圧生成部とを備える帰還部と、前記帰還部の帰還電流生成部により生成された帰還電流に応じて、前記検出部で検出される前記コモンモード電流を小さくする逆起電力を誘起する抑制部と、を備える。 A current source driven interference wave suppression filter according to the present invention detects a common mode current flowing out from a first electronic device serving as an interference source, and induces a first voltage caused by the common mode current; A feedback current generation unit that generates a feedback current according to a difference between the first voltage induced by the detection unit and a reference potential, and a voltage that matches the first voltage by the feedback current is generated as the reference potential. A feedback unit including a voltage generation unit, and a suppression unit that induces a back electromotive force that reduces the common mode current detected by the detection unit in accordance with the feedback current generated by the feedback current generation unit of the feedback unit And comprising.
本発明によれば、低周波帯域（例えば、１×１０４［Ｈｚ］〜１×１０５［Ｈｚ］）においてもコモンモードの妨害波の減衰量を保つことが出来る。 According to the present invention, it is possible to maintain the attenuation amount of the common mode interference wave even in a low frequency band (for example, 1 × 10 4 [Hz] to 1 × 10 5 [Hz]).
以下、実施形態の電流源駆動型妨害波抑制フィルタ１０を図面を参照して説明する。
図１は、実施形態に係る電流源駆動型妨害波抑制フィルタ１０（以下、妨害波抑制フィルタ１０と呼ぶ）を備えた妨害波抑制システム１の全体構成を示す図である。
Hereinafter, the current source drive type interference wave suppression filter 10 of the embodiment will be described with reference to the drawings.
FIG. 1 is a diagram illustrating an overall configuration of an interference wave suppression system 1 including a current source driven interference wave suppression filter 10 (hereinafter referred to as an interference wave suppression filter 10) according to an embodiment.
前記妨害波抑制システム１は、電子機器（妨害源）２０、電子機器（被妨害機器）３０、ならびにこれらの電子機器２０および３０の間に設けられた妨害波抑制フィルタ１０を備える。 The interference wave suppression system 1 includes an electronic device (interference source) 20, an electronic device (interference device) 30, and an interference wave suppression filter 10 provided between these electronic devices 20 and 30.
電子機器２０からは、コモンモード妨害波が発生される。このコモンモード妨害波によってコモンモード電流Ｉｃが電源線Ｓｐを伝搬する。 A common mode interference wave is generated from the electronic device 20. The common mode current Ic propagates through the power supply line Sp by the common mode interference wave.
電子機器３０は、電子機器２０と前記電源線Ｓｐを介して接続される。また、電子機器２０および３０は、共通接地線Ｓｇを介して共通接続される。 The electronic device 30 is connected to the electronic device 20 via the power supply line Sp. The electronic devices 20 and 30 are commonly connected via a common ground line Sg.
前記妨害波抑制フィルタ１０は、上記電子機器２０から発生し、電源線Ｓｐを伝搬するコモンモードの妨害波によるコモンモード電流Ｉｃを抑制する。
前記妨害波抑制フィルタ１０は、検出部１０ａ、電流源駆動型帰還部１０ｂ（以下、帰還部１０ｂと呼ぶ）、および抑制部１０ｃを備える。
The interference wave suppression filter 10 suppresses a common mode current Ic generated by the electronic device 20 and caused by a common mode interference wave propagating through the power line Sp.
The interference wave suppression filter 10 includes a detection unit 10a, a current source driven feedback unit 10b (hereinafter referred to as feedback unit 10b), and a suppression unit 10c.
検出部１０ａは、コモンモード電流Ｉｃを検出し、このコモンモード電流Ｉｃを電圧Ｖａ’に変換する。また、検出部１０ａは、前記電圧Ｖａ’を帰還部１０ｂへ印加する。ここで、検出部１０ａが検出した前記コモンモード電流Ｉｃが電源線Ｓｐを介して抑制部１０ｃに伝搬される。 The detection unit 10a detects the common mode current Ic and converts the common mode current Ic into a voltage Va '. The detection unit 10a applies the voltage Va 'to the feedback unit 10b. Here, the common mode current Ic detected by the detection unit 10a is propagated to the suppression unit 10c through the power supply line Sp.
前記帰還部１０ｂは、前記電圧Ｖａ’に応じた帰還電流Ｉｏｕｔを生成し、当該帰還電流Ｉｏｕｔを抑制部１０ｃに供給する。 The feedback unit 10b generates a feedback current Iout corresponding to the voltage Va ', and supplies the feedback current Iout to the suppression unit 10c.
抑制部１０ｃは、前記帰還部１０ｂから供給された帰還電流Ｉｏｕｔに応じて、前記検出部１０ａにて検出されたコモンモード電流Ｉｃを小さくする電圧Ｖｂを発生する。これにより、前記電子機器２０が発生し、電源線Ｓｐを介して電子機器３０へ伝搬するコモンモード電流Ｉｃが抑制される。 The suppression unit 10c generates a voltage Vb that reduces the common mode current Ic detected by the detection unit 10a in accordance with the feedback current Iout supplied from the feedback unit 10b. As a result, the common mode current Ic generated by the electronic device 20 and propagating to the electronic device 30 via the power line Sp is suppressed.
図２は、前記妨害波抑制フィルタ１０の構成を示す回路図である。
まず、検出部１０ａ、電流源駆動型帰還部１０ｂ、及び抑制部１０ｃの構成について説明する。
FIG. 2 is a circuit diagram showing a configuration of the interference wave suppression filter 10.
First, the configuration of the detection unit 10a, the current source drive type feedback unit 10b, and the suppression unit 10c will be described.
前記検出部１０ａは、一次側に電源線Ｓｐ、二次側に導線を巻いたフェライトコアを用いて作製されていることから、一次側コイルおよび二次側コイルを有するトランスで回路表記する。検出部１０ａが有する一次側コイルの自己インダクタンスをＬａ、相互インダクタンスＭａ、二次側コイルの巻数をｎＡ回（ｎＡ≧１）とする。 Since the detection unit 10a is manufactured using a ferrite core in which the power source line Sp is wound on the primary side and the conductive wire is wound on the secondary side, the circuit is represented by a transformer having a primary side coil and a secondary side coil. The self-inductance of the primary coil included in the detection unit 10a is La, the mutual inductance Ma, and the number of turns of the secondary coil is n A times (n A ≧ 1).
抑制部１０ｃについても、一次側に導線、二次側に前記電源線Ｓｐを巻いたフェライトコアを用いて作製されていることから、一次側コイルおよび二次側コイルを有するトランスで回路表記する。当該抑制部１０ｃの二次側コイルの自己インダクタンスをＬｂ、相互インダクタンスＭｂとし、一次側コイルの巻数をｎＢ回（ｎＢ≧１）とする。 The suppression unit 10c is also expressed as a circuit with a transformer having a primary side coil and a secondary side coil because it is manufactured using a ferrite core in which a conductive wire is wound on the primary side and the power supply line Sp is wound on the secondary side. The self-inductance of the secondary side coil of the suppression unit 10c is Lb and the mutual inductance Mb, and the number of turns of the primary side coil is n B times (n B ≧ 1).
前記検出部１０ａを構成するフェライトコアの一次側に巻かれた電源線Ｓｐと、抑制部１０ｃを構成するフェライトコアの二次側に巻かれた電源線Ｓｐとは直列接続されている。 A power supply line Sp wound on the primary side of the ferrite core constituting the detection unit 10a and a power supply line Sp wound on the secondary side of the ferrite core constituting the suppression unit 10c are connected in series.
なお、Ｖｃはコモンモード電流Ｉｃを発生する電圧源を、またＺｃは当該コモンモード電流Ｉｃからみたときの電子機器２０から電子機器３０までの配線抵抗を含むコモンモードインピーダンスを示している。 Vc represents a voltage source that generates a common mode current Ic, and Zc represents a common mode impedance including a wiring resistance from the electronic device 20 to the electronic device 30 when viewed from the common mode current Ic.
電流源駆動型帰還部１０ｂは、差動増幅器Ａｍｐ（以下、オペアンプＡｍｐと称する）を用いた増幅回路により構成される。なお、ＺｏｕｔおよびＺｉｎ（電圧生成部）はそれぞれ上記オペアンプＡｍｐの出力インピーダンスおよび負極側入力（反転入力）の合成入力インピーダンスを示す。 The current source drive type feedback unit 10b is configured by an amplifier circuit using a differential amplifier Amp (hereinafter referred to as an operational amplifier Amp). Zout and Zin (voltage generation unit) indicate the output impedance of the operational amplifier Amp and the combined input impedance of the negative side input (inverted input), respectively.
オペアンプＡｍｐの正極側入力端子（非反転入力端子）には前記検出部１０の二次側コイルの一端が接続され、負極側入力端子（反転入力端子）にはノードＮ１を介して前記抑制部１０ｃの一次側コイルの他端が接続される。また、ノードＮ１と前記検出部１０の二次側コイルの他端との間に入力インピーダンスＺｉｎが接続される。ただし、Ｚｉｎは純抵抗に近いものとし、オペアンプＡｍｐの負極側入力（反転入力）が元々有する入力インピーダンスと外付け素子との並列合成インピーダンスを表すものとする。すなわち、入力インピーダンスＺｉｎの両端に発生する電圧が、オペアンプＡｍｐの負極側入力端子（反転入力端子）に基準電圧として印加される。さらに、オペアンプＡｍｐの出力端子は、出力インピーダンスＺｏｕｔを介して上記抑制部１０ｃの一次側コイルの一端に接続される。 One end of the secondary coil of the detection unit 10 is connected to the positive input terminal (non-inverting input terminal) of the operational amplifier Amp, and the suppression unit 10c is connected to the negative input terminal (inverting input terminal) via the node N1. The other end of the primary side coil is connected. An input impedance Zin is connected between the node N1 and the other end of the secondary coil of the detection unit 10. However, it is assumed that Zin is close to a pure resistance and represents a parallel combined impedance of the input impedance originally possessed by the negative side input (inverting input) of the operational amplifier Amp and the external element. That is, the voltage generated at both ends of the input impedance Zin is applied as a reference voltage to the negative input terminal (inverting input terminal) of the operational amplifier Amp. Furthermore, the output terminal of the operational amplifier Amp is connected to one end of the primary side coil of the suppression unit 10c via the output impedance Zout.
この構成において、前記電圧源Ｖｃにより発生されるコモンモード電流Ｉｃが電源線Ｓｐを伝搬すると、前記検出部１０ａの一次側コイルに電圧Ｖａが印加される。また、コモンモード電流Ｉｃによって発生した磁界がフェライトコアを貫通することで巻数ｎＡ回に応じた電圧として二次側コイルに電圧Ｖａ’が誘起される。 In this configuration, when the common mode current Ic generated by the voltage source Vc propagates through the power supply line Sp, the voltage Va is applied to the primary coil of the detection unit 10a. Further, the induced voltage Va 'to the secondary side coil as a voltage corresponding to the number of turns n A times by a magnetic field generated by the common mode current Ic through the ferrite core.
その結果、前記電流源駆動型帰還部１０ｂを構成するオペアンプＡｍｐの正極側入力端子に前記電圧Ｖａ’が印加される。 As a result, the voltage Va ′ is applied to the positive input terminal of the operational amplifier Amp constituting the current source drive type feedback unit 10b.
上記電圧Ｖａ’が印加されると、オペアンプＡｍｐからは、上記電圧Ｖａ’と、負極側入力端子に印加される基準電位との電位差に応じた帰還電流Ｉｏｕｔが出力される。 When the voltage Va ′ is applied, the operational amplifier Amp outputs a feedback current Iout corresponding to the potential difference between the voltage Va ′ and the reference potential applied to the negative input terminal.
つまり、ノードＮ１の電位が電圧Ｖａ’となるように、所定の値を有した帰還電流ＩｏｕｔオペアンプＡｍｐから出力されることで、当該インピーダンスＺｉｎの両端に電圧−Ｖａ’が印加され、当該電圧−Ｖａ’が、オペアンプＡｍｐの負極側入力端子に印加される。 That is, by outputting from the feedback current Iout operational amplifier Amp having a predetermined value so that the potential of the node N1 becomes the voltage Va ′, the voltage −Va ′ is applied to both ends of the impedance Zin, and the voltage − Va ′ is applied to the negative input terminal of the operational amplifier Amp.
このように、帰還電流Ｉｏｕｔは、オペアンプＡｍｐの正極側入力端子に入力される電圧Ｖａ’の大きさに依存する値である。 Thus, the feedback current Iout is a value that depends on the magnitude of the voltage Va ′ input to the positive input terminal of the operational amplifier Amp.
また、前記帰還電流Ｉｏｕｔが抑制部１０ｃの一次側コイルを伝搬することで、当該一次側コイルに巻数ｎＢ回に応じた電圧Ｖｂ’が発生される。 Further, the feedback current Iout by propagating primary coil of suppressing portion 10c, the voltage Vb 'that corresponds to the number of turns n B times the primary coil is generated.
その結果、前記一次側コイルに印加された電圧Ｖｂ’に応じた電圧Ｖｂが二次側コイルに誘起される。 As a result, a voltage Vb corresponding to the voltage Vb ′ applied to the primary coil is induced in the secondary coil.
具体的には、帰還電流Ｉｏｕｔによって発生した磁界がフェライトコアを貫通することで抑制部１０ｃの二次側コイルに、前記コモンモード電流Ｉｃとは逆方向の電圧Ｖｂが誘起される。以下、この電圧Ｖｂを、逆起電力Ｖｂと呼ぶ。このため、逆起電力Ｖｂによる、コモンモード電流Ｉｃからみた当該コモンモード電流Ｉｃの流れ難さ、すなわち直列インピーダンスが増加する。 Specifically, when the magnetic field generated by the feedback current Iout penetrates the ferrite core, a voltage Vb in the direction opposite to the common mode current Ic is induced in the secondary coil of the suppressing unit 10c. Hereinafter, this voltage Vb is referred to as a back electromotive force Vb. For this reason, it is difficult for the common mode current Ic to flow as viewed from the common mode current Ic due to the back electromotive force Vb, that is, the series impedance increases.
この結果、前記逆起電力Ｖｂが大きくなるに連れて抑制部１０ｃにおける直列インピーダンスが大きくなることから、前記コモンモード電流Ｉｃが電源線Ｓｐに流れ難くなる。すなわち、抑制部１０ｃの二次側コイルによる逆起電力Ｖｂの誘起により検出部１０ａにて検出されるコモンモード電流Ｉｃの値が抑制され小さくなる。 As a result, as the back electromotive force Vb increases, the series impedance in the suppression unit 10c increases, so that the common mode current Ic hardly flows through the power supply line Sp. That is, the value of the common mode current Ic detected by the detection unit 10a is suppressed and reduced by induction of the counter electromotive force Vb by the secondary side coil of the suppression unit 10c.
その後、前記逆起電力Ｖｂの発生より減少したコモンモード電流Ｉｃに応じて低減した電圧Ｖａ’と、ノードＮ１の基準電位と、が一致するよう、当初よりも低減した帰還電流ＩｏｕｔがオペアンプＡｍｐの出力端子から出力され、その後、抑制部１０ｃの一次側コイルとインピーダンスＺｉｎとを流れる。 After that, the feedback current Iout reduced from the beginning is reduced so that the voltage Va ′ reduced according to the common mode current Ic reduced from the generation of the back electromotive force Vb matches the reference potential of the node N1. It is output from the output terminal, and then flows through the primary side coil and the impedance Zin of the suppressing unit 10c.
帰還電流Ｉｏｕｔが当初よりも低減していることから、抑制部１０ｃの一次側コイルに印加される電圧Ｖｂ’が小さくなり、また誘起させる逆起電力Ｖｂも当初よりも小さくなる。そうすると、増加したコモンモード電流Ｉｃに応じて検出部１０ａの二次側コイルに電圧Ｖａ’が誘起され、またこの電圧Ｖａ’に応じた帰還電流Ｉｏｕｔが発生する。このように帰還電流Ｉｏｕｔは増減を繰り返し、一定時間後に定電流の帰還電流ＩｏｕｔがオペアンプＡｍｐから出力される。 Since the feedback current Iout is reduced from the initial level, the voltage Vb ′ applied to the primary coil of the suppressing unit 10c is reduced, and the induced back electromotive force Vb is also reduced from the initial level. Then, a voltage Va ′ is induced in the secondary coil of the detection unit 10a according to the increased common mode current Ic, and a feedback current Iout corresponding to the voltage Va ′ is generated. In this way, the feedback current Iout repeatedly increases and decreases, and a constant current feedback current Iout is output from the operational amplifier Amp after a certain time.
ここで、抑制周波数の帯域幅をより低周波側に拡大させるために、抑制部１０ｃの一次側コイルをｎＢ回巻いている。この場合、オペアンプＡｍｐの出力端からみた抑制部１０ｃにおける一次側コイルの直列インピーダンス（以下、直列インピーダンスＺｆと呼ぶ）が増加するが、帰還電流Ｉｏｕｔは定電流であるため、当該抑制部１０ｃの一次側コイルに流れ込む帰還電流Ｉｏｕｔは減少することなく、前記コモンモード電流Ｉｃを打ち消すだけの必要な逆起電力Ｖｂを二次側コイルに誘起させることができる。 Here, in order to expand the bandwidth of the suppression frequency to a lower frequency side, and the primary side coil of the suppression portion 10c wound n B times. In this case, the series impedance (hereinafter referred to as series impedance Zf) of the primary side coil in the suppression unit 10c as viewed from the output terminal of the operational amplifier Amp increases, but the feedback current Iout is a constant current, and thus the primary of the suppression unit 10c. The feedback current Iout flowing into the side coil does not decrease, and the back electromotive force Vb necessary to cancel the common mode current Ic can be induced in the secondary side coil.
このように、抑制部１０ｃの一次側のコイルの巻数を増やすことでオペアンプＡｍｐの出力端子からみた前記直列インピーダンスＺｆが増加した場合であっても、前記帰還電流Ｉｏｕｔが減少し、コモンモード電流Ｉｃを抑制するための逆起電力Ｖｂを二次側コイルに誘起させることができないといった不都合を解消することができる。 As described above, even when the series impedance Zf viewed from the output terminal of the operational amplifier Amp is increased by increasing the number of turns of the primary side coil of the suppressing unit 10c, the feedback current Iout is decreased and the common mode current Ic is decreased. The problem that the counter electromotive force Vb for suppressing the secondary coil cannot be induced in the secondary coil can be solved.
図３は、妨害波抑制フィルタ１０による周波数［Ｈｚ］に応じたコモンモード電流Ｉｃの減衰量［ｄＢ］を示した図である。 FIG. 3 is a diagram showing the attenuation [dB] of the common mode current Ic according to the frequency [Hz] by the interference wave suppression filter 10.
図３に示すように、従来と比べて低周波数帯域側（１×１０４〜１×１０５［Ｈｚ］）においてもコモンモード電流Ｉｃの減衰量を１５［ｄＢ］以上に保つことができている。 As shown in FIG. 3, the attenuation of the common mode current Ic can be maintained at 15 [dB] or more on the low frequency band side (1 × 10 4 to 1 × 10 5 [Hz]) as compared with the conventional case. Yes.
以上説明したように実施形態に係る妨害波抑制フィルタ１０では、前記構成の妨害波抑制フィルタ１０によれば、検出したコモンモード電流Ｉｃによって発生した磁界がフェライトコアを貫通することで電圧Ｖａ’を誘起させる検出部１０ａと、前記検出部１０ａによって誘起された電圧Ｖａ’と基準電圧との差に応じた帰還電流Ｉｏｕｔを生成する帰還電流生成部、および前記帰還電流Ｉｏｕｔにより前記電圧Ｖａ’に一致する電圧を前記基準電位として生成するインピーダンスＺｉｎ（電圧生成部）を備える帰還部１０ｂと、前記帰還部１０ｂの帰還電流生成部により生成された帰還電流Ｉｏｕｔに応じて逆起電力Ｖｂを発生させて、前記検出部１０ａで検出される前記コモンモード電流Ｉｃを小さくする抑制部１０ｃと、を備える。 As described above, in the interference wave suppression filter 10 according to the embodiment, according to the interference wave suppression filter 10 having the above-described configuration, the voltage Va ′ is generated by the magnetic field generated by the detected common mode current Ic penetrating the ferrite core. The detection unit 10a to be induced, the feedback current generation unit that generates the feedback current Iout according to the difference between the voltage Va ′ induced by the detection unit 10a and the reference voltage, and the voltage Va ′ by the feedback current Iout A feedback unit 10b having an impedance Zin (voltage generation unit) that generates a voltage to be generated as the reference potential, and a back electromotive force Vb is generated according to the feedback current Iout generated by the feedback current generation unit of the feedback unit 10b. And a suppression unit 10c that reduces the common mode current Ic detected by the detection unit 10a.
従って、インピーダンスＺｉｎを設けることで前記帰還部１０ｂの前記オペアンプＡｍｐから定電流の帰還電流Ｉｏｕｔを出力させることができる。前記帰還電流Ｉｏｕｔは定電流であるため、抑制周波数帯域を低周波側に拡大させるために抑制部１０ｃの一次側コイルの巻数をｎＢ回に増加し、当該一次側コイルの直列インピーダンスを増加させた場合であっても帰還電流Ｉｏｕｔが減少しないことから、電源線Ｓｐを伝搬するコモンモード電流Ｉｃを打ち消すだけの十分な逆起電力Ｖｂを抑制部１０ｃの二次側コイルに誘起させることができる。 Therefore, by providing the impedance Zin, a constant feedback current Iout can be output from the operational amplifier Amp of the feedback unit 10b. Since the feedback current Iout is constant current, the number of turns of the primary coil of the suppression portion 10c in order to enlarge the suppressed frequency band to a lower frequency increased to n B times, increase the series impedance of the primary coil Even in this case, the feedback current Iout does not decrease, so that a sufficient counter electromotive force Vb sufficient to cancel the common mode current Ic propagating through the power supply line Sp can be induced in the secondary side coil of the suppressing unit 10c. .
よって、低周波帯域においてもコモンモード電流Ｉｃを十分に抑制することができ、電子機器３０（図１参照）に与える影響を抑制することができる。 Therefore, the common mode current Ic can be sufficiently suppressed even in the low frequency band, and the influence on the electronic device 30 (see FIG. 1) can be suppressed.
なお、本発明は、前記実施形態に限定されるものではなく、実施段階ではその要旨を逸脱しない範囲で種々に変形することが可能である。さらに、前記実施形態には種々の段階の発明が含まれており、開示される複数の構成要件における適宜な組み合わせにより種々の発明が抽出され得る。例えば、実施形態に示される全構成要件から幾つかの構成要件が削除されたり、幾つかの構成要件が異なる形態にして組み合わされても、発明が解決しようとする課題の欄で述べた課題が解決でき、発明の効果の欄で述べられている効果が得られる場合には、この構成要件が削除されたり組み合わされた構成が発明として抽出され得るものである。 In addition, this invention is not limited to the said embodiment, In the implementation stage, it can change variously in the range which does not deviate from the summary. Further, the embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment or some constituent requirements are combined in different forms, the problems described in the column of the problem to be solved by the invention are not solved. When the effects described in the column “Effects of the Invention” can be obtained, a configuration in which these constituent requirements are deleted or combined can be extracted as an invention.
１０…電流源駆動型妨害波抑制フィルタ、２０…電子機器（妨害源）、３０…電子機器（被妨害源）、１０ａ…検出部、１０ｂ…電流源駆動型帰還部、１０ｃ…抑制部、Ｖｃ…電圧源、Ｚｃ…コモンモードインピーダンス、Ｌａ、Ｌｂ…インダクタンス、Ｚｉｎ、Ｚｏｕｔ…インピーダンス、Ｉｏｕｔ…帰還電流、Ａｍｐ…オペアンプ。 DESCRIPTION OF SYMBOLS 10 ... Current source drive type interference wave suppression filter, 20 ... Electronic device (interference source), 30 ... Electronic device (interference source), 10a ... Detection unit, 10b ... Current source drive type feedback unit, 10c ... Suppression unit, Vc ... Voltage source, Zc ... Common mode impedance, La, Lb ... Inductance, Zin, Zout ... Impedance, Iout ... Feedback current, Amp ... Operational amplifier.
Claims (5)
前記検出部によって誘起された前記第１電圧と基準電位との差に応じた帰還電流を生成する帰還電流生成部と、前記帰還電流により前記第１電圧に一致する電圧を前記基準電位として生成する電圧生成部とを備える帰還部と、
前記帰還部の帰還電流生成部により生成された帰還電流に応じて、前記検出部で検出される前記コモンモード電流を小さくする逆起電力を誘起する抑制部と、
を備える電流源駆動型妨害波抑制フィルタ。 A detection unit that detects a common mode current flowing out of the first electronic device serving as a disturbance source and induces a first voltage caused by the common mode current;
A feedback current generation unit that generates a feedback current according to a difference between the first voltage induced by the detection unit and a reference potential, and a voltage that matches the first voltage by the feedback current is generated as the reference potential. A feedback unit comprising a voltage generation unit;
In accordance with the feedback current generated by the feedback current generation unit of the feedback unit, a suppression unit for inducing a counter electromotive force to reduce the common mode current detected by the detection unit,
A current source drive type interference wave suppression filter comprising:
前記抑制部は、一次側においてｎ回の巻数を有する導線と、前記二次側に前記電源線と、をそれぞれ巻いた第２のフェライトコアを有し、
前記帰還部による帰還電流により前記抑制部の第２のフェライトコアの一次側に発生する第２電圧に応じた前記逆起電力を、前記抑制部の第２のフェライトコアの二次側に誘起させる、請求項１または請求項２に記載の電流源駆動型妨害波抑制フィルタ。 The detection unit includes a first ferrite core in which a power line on which the common mode current is superimposed on a primary side and a conductive wire connected to an input terminal of a feedback current generation unit of the feedback unit are wound on a secondary side. Have
The suppression unit has a second ferrite core in which a conducting wire having n turns on the primary side and the power line on the secondary side are wound, respectively.
The back electromotive force according to the second voltage generated on the primary side of the second ferrite core of the suppression unit is induced on the secondary side of the second ferrite core of the suppression unit by the feedback current from the feedback unit. The current source drive type interference wave suppression filter according to claim 1 or 2.
前記第１のフェライトコアの二次側の一端に接続される正極側入力端子と、前記第１のフェライトコアの二次側の他端に接続される負極側入力端子とを有する、前記帰還電流を出力する差動増幅器と、
前記差動増幅器の負極側入力端子と前記第１のフェライトコアの二次側の他端との間に、前記基準電位を前記正極側入力端子に印加される前記第１電圧に応じた値に設定するための前記電圧生成部として機能するインピーダンスと、
を備える請求項３または請求項４に記載の電流源駆動型妨害波抑制フィルタ。 The feedback section is
The feedback current having a positive input terminal connected to one end on the secondary side of the first ferrite core and a negative input terminal connected to the other end on the secondary side of the first ferrite core. A differential amplifier that outputs
The reference potential is set to a value corresponding to the first voltage applied to the positive input terminal between the negative input terminal of the differential amplifier and the other end of the secondary side of the first ferrite core. An impedance that functions as the voltage generator for setting;
A current source drive type interference wave suppression filter according to claim 3 or 4, comprising:
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5921108A (en) * | 1982-07-26 | 1984-02-03 | Sony Corp | Power amplifier having constant current output characteristic |
| JPS6198096A (en) * | 1984-10-19 | 1986-05-16 | Matsushita Electric Ind Co Ltd | Speaker device |
| JPH07115339A (en) * | 1993-10-18 | 1995-05-02 | Hanshin Densen Kk | Line filter and its impedance changing method |
| JPH10303674A (en) * | 1997-04-25 | 1998-11-13 | Sony Corp | Ac line filter |
| WO2011125944A1 (en) * | 2010-04-05 | 2011-10-13 | 三菱電機株式会社 | Leakage current reducing device |
-
2017
- 2017-08-25 JP JP2017162790A patent/JP6811459B2/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5921108A (en) * | 1982-07-26 | 1984-02-03 | Sony Corp | Power amplifier having constant current output characteristic |
| JPS6198096A (en) * | 1984-10-19 | 1986-05-16 | Matsushita Electric Ind Co Ltd | Speaker device |
| JPH07115339A (en) * | 1993-10-18 | 1995-05-02 | Hanshin Densen Kk | Line filter and its impedance changing method |
| JPH10303674A (en) * | 1997-04-25 | 1998-11-13 | Sony Corp | Ac line filter |
| WO2011125944A1 (en) * | 2010-04-05 | 2011-10-13 | 三菱電機株式会社 | Leakage current reducing device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466537A (en) * | 2021-05-26 | 2021-10-01 | 国网江苏省电力有限公司淮安供电分公司 | Anti-interference current and voltage acquisition method for power system |
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