JP2001094366A - Pseudo grounding circuit of audio power amplifier - Google Patents
Pseudo grounding circuit of audio power amplifierInfo
- Publication number
- JP2001094366A JP2001094366A JP30741299A JP30741299A JP2001094366A JP 2001094366 A JP2001094366 A JP 2001094366A JP 30741299 A JP30741299 A JP 30741299A JP 30741299 A JP30741299 A JP 30741299A JP 2001094366 A JP2001094366 A JP 2001094366A
- Authority
- JP
- Japan
- Prior art keywords
- power amplifier
- voltage
- audio
- ground
- power supply
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Landscapes
- Amplifiers (AREA)
Abstract
Description
【０００１】[0001]
【考案の属する技術分野】この発明は単一電源で高性能
なオーディオ直流接続電力増幅器を構成する回路に関す
るもので、今までの単一電源のオーディオ電力増幅器で
グラウンドアースに接地されていたスピーカーの一端を
半導体のプッシュプルの電力増幅器により疑似的にグラ
ウンドアースに接続して動作させるオーディオ直流接続
電力増幅器の回路構成に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit constituting a high performance audio DC connection power amplifier with a single power supply, and relates to a speaker which has been grounded to the ground ground in a conventional single power supply audio power amplifier. The present invention relates to a circuit configuration of an audio DC connection power amplifier which operates by connecting one end to a ground ground by a semiconductor push-pull power amplifier.
【０００２】[0002]
【従来の技術】従来、オーディオ直流接続電力増幅器を
構成するにはグラウンドアース（０Ｖ）に対し正と負の
２種類の電源で動作させている。オーディオ信号は中点
を基準に上下にほぼ均等に動作するため、スピーカー等
の負荷の片側端子をグラウンドアースに接続し、もう一
方の端子に正、負の電圧をかけて電流を流すことでスピ
ーカーを駆動している。この方式はとても高性能なアン
プを構成できる反面、電源を２種類用意しなくてはなら
ずコストもかかってしまい、サイズも小型化しにくい。2. Description of the Related Art Conventionally, an audio DC connection power amplifier is operated with two types of power supplies, positive and negative, with respect to ground earth (0 V). Since audio signals operate almost equally up and down with respect to the midpoint, one terminal of a load, such as a speaker, is connected to ground, and a positive or negative voltage is applied to the other terminal to allow current to flow. Is driving. Although this method can constitute a very high-performance amplifier, it requires two types of power supplies, which increases the cost and makes it difficult to reduce the size.
【０００３】[0003]
【発明が解決しようとする課題】単一電源でオーディオ
直流接続電力増幅器を構成しようとすると、電源電圧の
中点を中心に上下にオーディオ信号が動作する事にな
る。スピーカーの片側をグラウンドアースに接続する
と、オーディオ信号の中心と直流の電位差が出てしまう
ため、無信号時にスピーカーは電源電圧の中点の直流が
流された状態になるので、正しく駆動できない。したが
って、単一電源で駆動されるオーディオ電力増幅器はス
ピーカーの端子とアンプ出力間にコンデンサを挿入（交
流接続）し、スピーカーを駆動することになる。交流接
続は直流接続に比べ音質、特性等も劣っているのは周知
の事実であるのもかかわらず、汎用の単一電源アンプで
は直流接続電力増幅器は実現できなかった。If an audio DC connection power amplifier is to be constituted by a single power supply, the audio signal operates up and down around the midpoint of the power supply voltage. If one side of the loudspeaker is connected to ground earth, a DC potential difference will occur between the center of the audio signal and the dc, and the loudspeaker will be in a state in which the dc of the midpoint of the power supply voltage flows when there is no signal, so that it cannot be driven properly. Therefore, an audio power amplifier driven by a single power supply drives a speaker by inserting a capacitor (AC connection) between a speaker terminal and an amplifier output. Although it is a well-known fact that the AC connection is inferior to the DC connection in sound quality and characteristics, it has not been possible to realize a DC connection power amplifier with a general-purpose single power supply amplifier.
【０００４】[0004]
【課題を解決するための手段】通常はグラウンドアース
に接続されるべきスピーカーの端子は、オーディオ信号
電流が流される端子に対して常に基準電圧を保たなけれ
ばならない。激しい電圧変化をするオーディオ信号に対
し安定した電圧を保ち、負荷に対し十分に低インピーダ
ンスであってこそ信号に忠実にスピーカーを駆動できる
からである。単一電源で直流接続電力増幅器を実現する
にはそれを電源電圧の中点の電圧で行わなくてはならな
い。そこでグラウンドのかわりに中点電位を出力する低
インピーダンスでプッシュプルの半導体電力増幅器を接
続する。The terminals of the loudspeaker, which should normally be connected to ground, must always maintain a reference voltage with respect to the terminals through which audio signal currents flow. This is because a stable voltage can be maintained for an audio signal that undergoes a drastic voltage change, and the speaker can be driven faithfully to the signal only when the impedance is sufficiently low with respect to the load. To implement a DC-connected power amplifier with a single power supply, it must be performed at the midpoint of the power supply voltage. Therefore, a low-impedance push-pull semiconductor power amplifier that outputs a midpoint potential instead of the ground is connected.
【０００５】[0005]
【発明の実施の形態】この電力増幅器が接続された端子
は、スピーカーのもう一方の端子の電圧が電源電圧が増
大すれば電流を吸収し、減少すれば放出するプッシュプ
ル動作をして中点電圧を保ち続けることにより、今まで
の２電源による直流接続オーディオ電力増幅器のグラウ
ンドアースと同等の疑似グラウンドアースと見なすこと
が出来る。よって、単一電源で直流接続電力増幅器が可
能になる。今までにもＢＴＬ方式といわれているスピー
カーの端子の片側に逆相（正反対の動きをする）の信号
を出力する方式がある。この方式なら単一電源の直流接
続が可能である。しかし、この方式は同じ電圧でパワー
が４倍とれるという利点があるものの、歪率も比例して
増大してしまい、本発明の様なシングルエンド（片側を
電圧固定する）の方式の音質は得られない。DESCRIPTION OF THE PREFERRED EMBODIMENTS The terminal to which this power amplifier is connected performs a push-pull operation in which the voltage of the other terminal of the speaker absorbs current when the power supply voltage increases, and releases when the power supply voltage decreases. By maintaining the voltage, it can be regarded as a pseudo ground ground equivalent to the ground ground of the conventional DC connection audio power amplifier with two power supplies. Thus, a DC power amplifier can be realized with a single power supply. Up to now, there is a BTL system that outputs a signal of opposite phase (moving in the opposite direction) to one side of a speaker terminal. With this method, DC connection of a single power supply is possible. However, although this method has the advantage that the power can be quadrupled with the same voltage, the distortion factor also increases in proportion, and the sound quality of the single-ended (fixed voltage on one side) system of the present invention is obtained. I can't.
【０００６】[0006]
【考案の効果】本発明により、今までは大型高級電力増
幅器でしか実現出来なかったオーディオ直流接続電力増
幅器が単一電源の小型電力増幅器でも実現できるように
なった。電源部品の減少や交流接続のコンデンサが無く
なることにより、低コストで小型なオーディオ直流接続
電力増幅が可能になった。単一電源のオーディオ回路に
おいて中点電圧をアクティブにつくりだし、疑似グラウ
ンドアースとして使用する本発明は、オーディオ電力増
幅器だけでなく２電源が必要であった他の低周波増幅回
路にも応用できると思われる。According to the present invention, an audio DC connection power amplifier which can be realized only by a large high-grade power amplifier until now can be realized by a small power amplifier having a single power supply. The reduction in the number of power supply components and the elimination of capacitors for AC connection have made possible low-cost, compact audio DC connection power amplification. It is believed that the present invention, which actively creates a mid-point voltage in a single-supply audio circuit and uses it as a pseudo-ground, can be applied not only to audio power amplifiers but also to other low-frequency amplifier circuits that required two power supplies. It is.
【図１】今までの２電源動作のオーディオ直流接続電力
増幅器のブロック図FIG. 1 is a block diagram of a conventional dual power supply audio DC power amplifier.
【図２】今までの単一電源動作のオーディオ交流接続電
力増幅器のブロック図FIG. 2 is a block diagram of a conventional audio AC connection power amplifier operating with a single power supply.
【図３】本発明の単一電源動作のオーディオ直流接続電
力増幅器のブロック図FIG. 3 is a block diagram of a single power supply operation audio DC connection power amplifier of the present invention.
【図４】本発明の回路図例FIG. 4 is a circuit diagram example of the present invention.
１はオーディオの信号源 ２はオーディオ電力増幅器 ３は＋電源 ４は−電源 ５はスピーカー ６はグラウンドアース ７はコンデンサ 1 is an audio signal source 2 is an audio power amplifier 3 is a positive power supply 4 is a negative power supply 5 is a speaker 6 is a ground ground 7 is a capacitor
フロントページの続き Ｆターム(参考） 5J069 AA02 AA17 AA41 CA11 CA31 CA77 CA81 CA87 CA93 FA10 FA20 HA02 KA12 KA47 KA59 KA62 MA21 SA05 TA01 5J091 AA02 AA17 AA41 CA11 CA31 CA77 CA81 CA87 CA93 FA10 FA20 HA02 KA12 KA47 KA59 KA62 MA21 SA05 TA01 Continued on the front page F term (reference) 5J069 AA02 AA17 AA41 CA11 CA31 CA77 CA81 CA87 CA93 FA10 FA20 HA02 KA12 KA47 KA59 KA62 MA21 SA05 TA01 5J091 AA02 AA17 AA41 CA11 CA31 CA77 CA81 CA87 CA93 FA10 FA20 HA02 KA12 KA05 KA47
Claims (1)
力増幅器を構成するために、負荷を接続する出力端子の
一端を半導体増幅器により疑似的に接地する回路1. A circuit in which one end of an output terminal for connecting a load is pseudo-grounded by a semiconductor amplifier to constitute a high-performance audio DC connection power amplifier with a single power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30741299A JP2001094366A (en) | 1999-09-24 | 1999-09-24 | Pseudo grounding circuit of audio power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30741299A JP2001094366A (en) | 1999-09-24 | 1999-09-24 | Pseudo grounding circuit of audio power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001094366A true JP2001094366A (en) | 2001-04-06 |
Family
ID=17968754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30741299A Pending JP2001094366A (en) | 1999-09-24 | 1999-09-24 | Pseudo grounding circuit of audio power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001094366A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002095936A1 (en) * | 2001-05-21 | 2002-11-28 | Niigata Seimitsu Co., Ltd. | Audio output amplifier |
| WO2002095935A1 (en) * | 2001-05-21 | 2002-11-28 | Niigata Seimitsu Co., Ltd. | Audio output amplifier |
| JP2012090125A (en) * | 2010-10-21 | 2012-05-10 | Onkyo Corp | Amplifying device |
-
1999
- 1999-09-24 JP JP30741299A patent/JP2001094366A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002095936A1 (en) * | 2001-05-21 | 2002-11-28 | Niigata Seimitsu Co., Ltd. | Audio output amplifier |
| WO2002095935A1 (en) * | 2001-05-21 | 2002-11-28 | Niigata Seimitsu Co., Ltd. | Audio output amplifier |
| JP2012090125A (en) * | 2010-10-21 | 2012-05-10 | Onkyo Corp | Amplifying device |
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Legal Events
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|---|---|---|---|
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Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20060803 |
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