JP6734332B2 - Current negative feedback current drive amplifier - Google Patents
Current negative feedback current drive amplifier Download PDFInfo
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- JP6734332B2 JP6734332B2 JP2018155822A JP2018155822A JP6734332B2 JP 6734332 B2 JP6734332 B2 JP 6734332B2 JP 2018155822 A JP2018155822 A JP 2018155822A JP 2018155822 A JP2018155822 A JP 2018155822A JP 6734332 B2 JP6734332 B2 JP 6734332B2
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- 230000003321 amplification Effects 0.000 claims description 11
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Description
この発明はスピーカーを電流駆動するためのオーデイオ電流負帰還―電流駆動増幅器に関するものである。The present invention relates to an audio current negative feedback-current drive amplifier for current driving a speaker.
従来、スピーカーの再生には電圧駆動型のスピーカー駆動パワー増幅器が一般に実用上使用されており電流駆動型のパワー増幅器はほとんど市販されていない。Conventionally, a speaker driving power amplifier of a voltage driving type has been generally used in practice for reproducing a speaker, and a power amplifier of a current driving type has hardly been commercially available.
従来のスピーカー駆動パワー増幅器は、ほとんど電圧駆動型であるが、一般のダイナミックスピーカーは低域に共振点ｆ０ を有し、電気インピーダンスが上昇し、当該スピーカーに流れる電流は減少し、パワーが入り難いので低域での音圧が減る欠点がある。一方、電流駆動増幅器は一般に市販されていない。また、定電流駆動型なのでスピーカーの低域で生ずる共振点ｆ０ で電気インピーダンスが増加し、それに応じてパワーが増加し、音圧が上昇し周波数特性が平坦でなくなる欠点がある。本発明により、低インピーダンス出力による制動力を有し、平坦な周波数特性を示し、前記共振点ｆ０ での盛り上がりに起因する最大出力限界問題を解決した電流負帰還電流駆動増幅器とするものであるThe conventional speaker driving power amplifier is almost voltage driven type, but a general dynamic speaker has a resonance point f 0 in the low range, the electric impedance increases, the current flowing through the speaker decreases, and the power enters. Since it is difficult, there is a drawback that the sound pressure in the low range is reduced. On the other hand, current drive amplifiers are generally not commercially available. Further, since it is a constant current drive type, there is a drawback that the electric impedance increases at the resonance point f 0 generated in the low frequency range of the speaker, the power increases accordingly, the sound pressure increases, and the frequency characteristic becomes uneven. According to the present invention, there is provided a current negative feedback current drive amplifier which has a braking force by a low impedance output, exhibits a flat frequency characteristic, and solves the maximum output limit problem caused by the rise at the resonance point f 0.
本発明は電流負帰還回路にスピーカーユニットのボイスコイルを負帰還ネットワークとして動作させ、かつ当該スピーカーユニットを電流駆動とし、低域共振周波数ｆ０ での音圧の盛り上がりを平坦に抑えることである。According to the present invention, the current negative feedback circuit operates the voice coil of the speaker unit as a negative feedback network, and the speaker unit is driven by current to suppress the rise of the sound pressure at the low resonance frequency f 0 to be flat.
請求項１について本発明は前記課題の解決のため以下の手段を案出した。 スピーカー駆動システムであって、接続されるべき複数のボイスコイルから成るスピーカーユニットと、 バッファーアンプ部と、当該バッファーアンプ部の出力部を流れる電流の検出部と、電流加算部と、電流―電圧変換部と、電圧駆動増幅部と、電流負帰還部とを具備し、当該電圧駆動増幅部からの出力端とア−ス間に当該スピーカーユニットのボイスコイルを接続し、当該電圧駆動増幅部からの出力端と当該バッファーアンプ部の出力端との間に当該スピーカーユニットの他のボイスコイルを接続する、スピーカーユニットを含めた電流−電圧駆動増幅器の機能を有するスピーカー駆動システムである。Regarding Claim 1, the present invention has devised the following means for solving the above problems. A speaker driving system, which includes a speaker unit including a plurality of voice coils to be connected, a buffer amplifier unit, a current detection unit that detects a current flowing through the output unit of the buffer amplifier unit, a current addition unit, and a current-voltage conversion unit. Section, a voltage drive amplifier section, and a current negative feedback section, and a voice coil of the speaker unit is connected between the output end of the voltage drive amplifier section and the ground. A speaker drive system having a function of a current-voltage drive amplifier including a speaker unit, in which another voice coil of the speaker unit is connected between an output end and an output end of the buffer amplifier section.
請求項２について本発明は前記課題の解決のため以下の手段を案出した。
複数のボイスコイルから成るスピーカーユニットを駆動するためのスピーカー電流駆動増幅器であって、当該スピーカー電流駆動増幅器の出力部からの負帰還インピーダンスに当該スピーカーユニットのボイスコイルと、それに直列につながる抵抗器とで、その負帰還回路を構成し電流駆動を行う手段と、当該スピーカー電流駆動増幅器の出力部とアース間に当該スピーカーユニットの他のボイスコイルを接続し電圧駆動する手段とを備えることを特徴とするスピーカー電流ー電圧駆動増幅システムである。Regarding Claim 2, the present invention has devised the following means for solving the above problems.
A speaker current drive amplifier for driving a speaker unit composed of a plurality of voice coils, wherein a negative feedback impedance from an output part of the speaker current drive amplifier is connected to a voice coil of the speaker unit and a resistor connected in series to the voice coil. And a means for driving the current by configuring the negative feedback circuit, and means for driving the voltage by connecting another voice coil of the speaker unit between the output part of the speaker current drive amplifier and the ground. This is a speaker current-voltage drive amplification system.
請求項１によるモーショナルフィードバックも含めて、本発明によるモーショナルフィードバックによる効果を以下に示す。スピーカー駆動時、電流駆動するスピーカーユニットのボイスコイルに発生する逆起電圧の大きさはそのボイスコイルの速度に対応しているので、スピーカーの振動板の速度に比例した信号として逆起電圧を取り出す。また、電流駆動部を兼ねているこのボイスコイルによる逆起電圧検出部は、この逆起電圧に対して無制動で無負荷状態で電流が流れない。The effect of the motional feedback according to the present invention including the motional feedback according to claim 1 will be described below. When the speaker is driven, the magnitude of the back electromotive force generated in the voice coil of the current driven speaker unit corresponds to the speed of the voice coil, so the back electromotive force is extracted as a signal proportional to the speed of the speaker diaphragm. .. In addition, the counter electromotive voltage detection unit using the voice coil, which also serves as the current driver, does not apply a current to the counter electromotive voltage in a no-load state without braking.
スピーカーの制動力は電磁誘導によって振動板を止めるが、本発明では電磁制動より大きなメカニカルな制動である電流駆動出力と電圧駆動出力とによるモーショナルフィードバック機能をもって行う。The braking force of the speaker stops the diaphragm by electromagnetic induction, but in the present invention, it is carried out by a motional feedback function by current driving output and voltage driving output, which is mechanical braking larger than electromagnetic braking.
請求項２について図５に基づいて説明する。本発明の方式によって図５に示す増幅部Ａ（４０）の出力端（４１）とアース（３９）間にダブルボイスコイルの一方を接続し、他端に負帰還ボイスコイルを接続すると当該負帰還ボイスコイルから発生する逆起電圧が出力端（４１）とアース（３９）間にある電圧駆動するボイスコイルに働き、両ボイスコイルは同一筒に捲かれ機械的に結合しているので、モーショナルフィードバックが働き、直線性が増し、歪が改善される。さらに低インピーダンス出力の電圧駆動と連動しているので、ダンピングファクターは大きくなり制動効果が働き、電流駆動の制動の利かない欠点を取り去っている。Claim 2 will be described with reference to FIG. According to the method of the present invention, if one of the double voice coils is connected between the output end (41) and the ground (39) of the amplification section A (40) shown in FIG. The counter electromotive voltage generated from the voice coil acts on the voltage-driven voice coil between the output end (41) and the ground (39), and both voice coils are wound in the same cylinder and mechanically coupled to each other. Feedback works, linearity is increased, and distortion is improved. Furthermore, since it is linked to voltage drive with low impedance output, the damping factor increases and the braking effect works, eliminating the disadvantage of current drive that is not effective for braking.
図６は 図５に示された回路図の基本ブロックダイアグラムを示している。
以下請求項１に関して図６に基づいて説明する。
入力信号Ｖ１は抵抗Ｒｓ（４５）を通して電流ｉ１（４６）となりボイスコイルＢｌ１（４７）を励磁しＦ１＝Ｂ・ｌ１・ｉ１（４８）として駆動力Ｆ１となりスピーカーコーンの振動力となり、その機械インピーダンス１／Ｚｍ（４９）を通して振動速度ｖ０となる。一方、入力信号Ｖ１は 増幅部Ａ〔５１〕を通過して増幅され、 ボイスコイルＢｌ１（５７）に１／Ｚｖ（５６）を通して電流ｉ２（６０）として供給されＦ２＝Ｂ・ｌ２・ｉ２（５０）となり、ここで前記Ｆ１と当該Ｆ２が機械的に合流し、前記スピーカーコーンを振動させる。ここでＺｖはボイスコイルインピータンスとする。
前記機械インピーダンス１／Ｚｍ （４９）による速度出力によって逆起電圧
Hereinafter, claim 1 will be described with reference to FIG.
The input signal V 1 becomes a current i 1 (46) through the resistor Rs (45) to excite the voice coil Bl 1 (47) and F1=B·l 1 ·i 1 (48) to become the driving force F1 and the vibration force of the speaker cone. And the vibration velocity v 0 is obtained through the mechanical impedance 1/Zm (49). On the other hand, the input signal V1 passes through the amplifier A[51], is amplified, and is supplied as a current i 2 (60) to the voice coil Bl 1 (57) through 1/Zv (56) and F2=B·l 2 · i 2 (50), where the F1 and the F2 mechanically merge to vibrate the speaker cone. Here, Zv is a voice coil impedance.
The back electromotive force is generated by the velocity output by the mechanical impedance 1/Zm (49).
請求項２に関して図５に基づいて説明する。 ボイスコイルＢｌ１（４４）は、負帰還形の 増幅部Ａ（４０）によって駆動され、当該Ｂｌ１（４４）に流れる電流は抵抗Ｒｓ（３７）にかかる電圧Ｖ２により一定となる。前記Ｂｌ１（４４）の両端子間は高インピーダンス駆動となり、ここで発生する逆起電圧による電流は流れないがボイスコイルＢｌ２（４２）に電圧としてこの両端子間（片側は アース）にかかる。一方前記増幅部Ａ（４０）の出力端 （４１）とアース（３９）間に接続されているボイスコイルＢｌ２（４２）は定電圧駆動されており、低インピーダンス駆動となっている。前記ボイスコイルＢｌ１（４４）と同Ｂｌ２（４２）は同一筒に巻かれたダブルボイスコイルとなっている。
これにより定電流駆動と定電圧駆動が合成された駆動力となる。Claim 2 will be described with reference to FIG. The voice coil Bl 1 (44) is driven by the negative feedback type amplification unit A (40), and the current flowing through the Bl 1 (44) is constant due to the voltage V 2 applied to the resistor Rs (37). High impedance driving is performed between both terminals of the Bl 1 (44), and a current due to the counter electromotive voltage generated here does not flow, but it is applied as a voltage to the voice coil Bl 2 (42) between these two terminals (one side is grounded). .. On the other hand, the voice coil Bl 2 (42) connected between the output terminal (41) of the amplification section A (40) and the ground (39) is driven at a constant voltage and is driven at low impedance. The voice coil Bl 1 (44) and the voice coil Bl 2 (42) are double voice coils wound in the same cylinder.
As a result, a constant driving force and a constant voltage driving force are combined.
３７ ： 抵抗Ｒｓ
３８ ： 電流加算部
３９ ： アース
４０ ： 増幅部Ａ
４１ ： 出力端
４２ ： ボイスコイルＢｌ２
４４ ： ボイスコイルＢｌ１
４５ ： 抵抗Ｒｓ
４６ ： 電流ｉ１
４７ ： ボイスコイルＢｌ１
４８ ： Ｆ１
４９ ： 機械インピーダンス
５０ ： Ｆ２
５３ ： 逆起電圧Ｖ２
５４ ： 逆起電圧Ｖ１
５１ ： 増幅部Ａ
５６ ： ボイスコイルインピーダンスＺｖ
５７ ： ボイスコイルＢｌ２
６０ ： 電流ｉ２37: Resistance Rs
38: Current adder 39: Ground 40: Amplifier A
41: Output end 42: Voice coil Bl2
44: Voice coil Bl1
45: Resistance Rs
46: Current i1
47: Voice coil Bl1
48: F1
49: Mechanical impedance 50: F2
53: Back electromotive force V2
54: Back electromotive force V1
51: Amplification unit A
56: Voice coil impedance Zv
57: Voice coil Bl2
60: current i2
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| JP2018155822A JP6734332B2 (en) | 2018-08-06 | 2018-08-06 | Current negative feedback current drive amplifier |
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| JP2018155822A JP6734332B2 (en) | 2018-08-06 | 2018-08-06 | Current negative feedback current drive amplifier |
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| JP2015153673A Division JP6697230B2 (en) | 2015-07-16 | 2015-07-16 | Current negative feedback current drive amplifier |
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| JP2019004494A JP2019004494A (en) | 2019-01-10 |
| JP6734332B2 true JP6734332B2 (en) | 2020-08-05 |
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| EP3968515A1 (en) * | 2020-09-09 | 2022-03-16 | Shenzhen Goodix Technology Co., Ltd. | Driver circuit arrangement for high capacitive load |
| JP6997846B1 (en) * | 2020-09-14 | 2022-01-18 | 紀元 佐藤 | Power drive amplifier |
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