JPH09214265A - Power amplifier circuit - Google Patents
Power amplifier circuitInfo
- Publication number
- JPH09214265A JPH09214265A JP8040750A JP4075096A JPH09214265A JP H09214265 A JPH09214265 A JP H09214265A JP 8040750 A JP8040750 A JP 8040750A JP 4075096 A JP4075096 A JP 4075096A JP H09214265 A JPH09214265 A JP H09214265A
- Authority
- JP
- Japan
- Prior art keywords
- switching means
- power amplifier
- output
- power
- circuit
- 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.)
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、オーディオ用電力
増幅回路に係り、特にコンサート等に用いて好適な電力
増幅回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio power amplifier circuit, and more particularly to a power amplifier circuit suitable for use in concerts and the like.
【0002】[0002]
【従来の技術】従来からコンサート等で利用可能な大電
力用オーディオ用電力増幅回路として2組のSEPP
(Single Ended Push−Pull)回
路をOTL(Output Transformerl
ess)構成して逆相に駆動する様に成したBTL(B
alanced Transformerless)電
力増幅回路は通常のSEPP回路の2倍の電流電圧利用
率を有するため低電圧で大出力を得る場合やハイパワー
を得たい場合に広く利用されている。2. Description of the Related Art Two sets of SEPPs have been conventionally used as high-power audio power amplifier circuits that can be used in concerts and the like.
(Single Ended Push-Pull) circuit by an OTL (Output Transformer)
ess) configured to drive in reverse phase BTL (B
Since the balanced transform power amplifier circuit has a current-voltage utilization factor that is twice that of a normal SEPP circuit, it is widely used for obtaining a large output at a low voltage and for obtaining a high power.
【0003】図3は、この様なBTL電力増幅回路の構
成を示すもので、音源2としての例えばコンパクトディ
スク(CD)等のデータをアナログ変換して音質調整され
た入力信号は、BTL電力増幅回路を構成する第1及び
第2の電力増幅器3及び4に供給される。この第1及び
第2の電力増幅器3及び4は互いに逆相で駆動する様に
成されている。FIG. 3 shows the configuration of such a BTL power amplification circuit. An input signal whose sound quality is adjusted by analog-converting data such as a compact disc (CD) as the sound source 2 is a BTL power amplification circuit. It is supplied to the first and second power amplifiers 3 and 4 which form the circuit. The first and second power amplifiers 3 and 4 are configured to drive in opposite phases.
【0004】第1及び第2の電力増幅器3及び4の出力
端には第1及び第2のスイッチング手段7及び8として
例えば単投単極型の可動接片を有するリレーに接続さ
れ、第1及び第2のスイッチング手段7及び8の出力端
は出力端子T1 及びT2 を介して負荷であるスピーカ9
に接続されている。図3ではモノラル構成を示している
がステレオ構成では2組の左右のL,R用スピーカを2
組のBTL増幅回路で駆動する構成と成されている。The output terminals of the first and second power amplifiers 3 and 4 are connected to a relay having, for example, a single throw single pole type movable contact piece as the first and second switching means 7 and 8, and And the output ends of the second switching means 7 and 8 are speakers 9 as a load via output terminals T1 and T2.
It is connected to the. Although a monaural structure is shown in FIG. 3, two sets of left and right L and R speakers are arranged in a stereo structure.
It is configured to be driven by a pair of BTL amplifier circuits.
【0005】更に、このBTL増幅回路では、上記第1
又は/及び第2の電力増幅器3及び4が異常を生じたと
きに異常検出回路5で検出し、この検出信号に基づいて
スイッチング制御回路6を介して第1及び第2のスイッ
チング手段7及び8を「オフ」状態となして、スピーカの
損焼を保護するための保護回路が搭載されている。Further, in this BTL amplifier circuit, the first
Alternatively, and / or when an abnormality occurs in the second power amplifiers 3 and 4, the abnormality detection circuit 5 detects the abnormality, and based on this detection signal, the first and second switching means 7 and 8 via the switching control circuit 6. Is turned off, and a protection circuit for protecting the speaker from burning is installed.
【0006】然し、この様なBTL電力増幅回路ではコ
ンサート或いは演奏中に第1又は/及び第2の電力増幅
器3又は4が異常を起こすと、演奏が完全にスピーカ9
から遮断されて何の音もでてこない問題があった。この
様な問題を解消するために特開平2−86202号公報
には図4に示す様に演奏中に第1及び第2の電力増幅器
のうちの一方に異常が生じても他方の電力増幅器を用い
て演奏が中断しない様に成した構成の電力増幅回路が開
示されている。However, in such a BTL power amplifier circuit, if the first or / and the second power amplifier 3 or 4 becomes abnormal during a concert or performance, the performance will be completely lost.
There was a problem that no sound was produced after being cut off from. In order to solve such a problem, Japanese Unexamined Patent Publication No. 2-86202 discloses that, even if one of the first and second power amplifiers is abnormal during the performance, the other power amplifier is replaced as shown in FIG. There is disclosed a power amplifier circuit configured so that the performance is not interrupted by using the power amplifier circuit.
【0007】この電力増幅回路を図4で簡単に説明す
る。図4で図3との対応部分には同一符号を付して重複
説明は省略する。音源2からの入力信号はBTL電力増
幅回路14を構成する入力回路11に供給される。該入
力回路11は入力信号を位相反転する位相反転回路が内
蔵され、第1及び第2の電力増幅器3及び4に逆相の入
力信号が出力されて第1及び第2のスイッチング手段7
及び8及び出力端子T1及びT2 を介してスピーカ9に
供給される。This power amplifier circuit will be briefly described with reference to FIG. 4, parts corresponding to those in FIG. 3 are designated by the same reference numerals, and duplicate description will be omitted. The input signal from the sound source 2 is supplied to the input circuit 11 which constitutes the BTL power amplification circuit 14. The input circuit 11 has a built-in phase inversion circuit that inverts the phase of the input signal, and outputs the anti-phase input signal to the first and second power amplifiers 3 and 4 to output the first and second switching means 7.
And 8 and output terminals T1 and T2 to the speaker 9.
【0008】第1及び第2のスイッチング手段7及び8
のスイッチの電極は単投双極型となされ可動接片aが固
定接点bと接している時は第1及び第2の電力増幅器3
及び4からの出力がスピーカ9に供給される様に成さ
れ、第1及び第2のスイッチング手段7及び8の可動接
片aが固定接点cに接する場合にはスピーカ9は接地
(基準)電位に落とされる様に成され、これら第1及び
第2のスイッチング手段7及び8は第1及び第2の保護
回路12及び13でコントロールされてスイッチの可動
接片aを固定接点b又はc側に切り換え制御する。First and second switching means 7 and 8
The electrode of the switch is a single throw bipolar type, and when the movable contact piece a is in contact with the fixed contact b, the first and second power amplifiers 3
When the movable contact pieces a of the first and second switching means 7 and 8 are in contact with the fixed contact c, the speaker 9 is connected to the ground (reference) potential. The first and second switching means 7 and 8 are controlled by the first and second protection circuits 12 and 13 to move the movable contact piece a of the switch to the fixed contact b or c side. Control switching.
【0009】第1及び第2の保護回路12及び13の入
力側には第1及び第2の電力増幅器3及び4からの出力
が供給されると共に入力端子T3 及びT4 に接続された
ミューテング回路からの電源投入タイミング信号が供給
され第1及び第2の電力増幅器3及び4の異常や電源の
異常を検出可能と成され、これらの異常検出時にスイッ
チング手段7又は8の一方を駆動してスピーカ端子を基
準電位に落として、一方の電力増幅器のみで演奏を続け
ることで演奏中の音切れを防止する様に成されている。The outputs of the first and second power amplifiers 3 and 4 are supplied to the input sides of the first and second protection circuits 12 and 13 and the muting circuit connected to the input terminals T3 and T4. The power-on timing signal is supplied to detect the abnormality of the first and second power amplifiers 3 and 4 and the abnormality of the power source, and at the time of detecting these abnormality, one of the switching means 7 or 8 is driven to drive the speaker terminal. Is dropped to the reference potential and the performance is continued by only one of the power amplifiers to prevent the interruption of the sound during the performance.
【0010】[0010]
【発明が解決しようとする課題】上述の図4に示した従
来構成によれば、BTL電力増幅回路内で何らかの原因
で異常が生じた場合、或いは出力電流が許容値より大き
くなると保護回路が動作して一方の電力増幅器のスピー
カ端子を接地電位に落とし、正常に動作している他方の
電力増幅器を駆動するため演奏時に再生音が遮断される
弊害は除くことができる。According to the conventional structure shown in FIG. 4, the protection circuit operates when an abnormality occurs in the BTL power amplifier circuit for some reason or when the output current becomes larger than the allowable value. Then, the speaker terminal of one of the power amplifiers is dropped to the ground potential, and the other power amplifier that is operating normally is driven, so that the adverse effect of interrupting the reproduced sound during performance can be eliminated.
【0011】然し、今まで第1及び第2の電力増幅器に
よって駆動再生されていたものが突然、出力レベルだと
約半分、パワー出力だと1/4の出力の音で出力されて
再生されるために演奏を聞いている人には違和感を与え
る。特にコンサート等では聴衆に拡声装置の異常を直ち
に知られてしまう問題があった。However, what has been driven and reproduced by the first and second power amplifiers up to now is suddenly output and reproduced with about half of the output level and 1/4 of the power output. It gives a feeling of strangeness to the person who is listening to the performance. Especially at concerts and the like, there is a problem that the abnormality of the loudspeaker is immediately known to the audience.
【0012】本発明は叙上の問題点を解消した電力増幅
回路を提供しようとするもので、その課題とするところ
は音切れを生じさせないと共に視聴者に異常を感じさせ
ない様に成した電力増幅回路を得るにある。The present invention is intended to provide a power amplifier circuit which solves the above-mentioned problems, and its problem is that the power amplifier is designed so as not to cause sound interruption and not to make the viewer feel abnormal. To get the circuit.
【0013】[0013]
【課題を解決するための手段】本発明の電力増幅回路は
その例が図1に示されている様に入力信号を互いに逆相
で出力する第1及び第2の電力増幅器3及び4の出力側
に夫々第1及び第2のスイッチング手段7及び8を介し
て直列に接続した特性の略等しい負荷9A及び9Bを駆
動する様に成した電力増幅回路1に於いて、第1及び第
2のスイッチング手段7及び8の夫々の出力側を反対側
の第2及び第1のスイッチング手段8及び7側の固定接
点cと接続すると共に直列に接続した負荷9A及び9B
の接続中点に一端が基準電位に接続された第3のスイッ
チング手段10を接続して成るものである。The power amplifier circuit according to the present invention, as an example of which is shown in FIG. 1, outputs the first and second power amplifiers 3 and 4 which output input signals in opposite phases. In the power amplifier circuit 1 configured to drive the loads 9A and 9B having substantially equal characteristics, which are connected in series to the sides via the first and second switching means 7 and 8, respectively. Loads 9A and 9B in which the respective output sides of the switching means 7 and 8 are connected to the fixed contacts c on the opposite side of the second and first switching means 8 and 7 and are connected in series.
The third switching means 10, one end of which is connected to the reference potential, is connected to the connection middle point of.
【0014】本発明の電力増幅回路によれば、例えば第
1の電力増幅器3に異常を生じたとき、第1及び第2の
スピーカ9A及び9Bは第2の電力増幅器4に並列に接
続され、第2の電力増幅器4から視た負荷インピーダン
スを1/2にし、駆動電流を2倍にして駆動するため正
常時と略等しい出力の音を放音可能となるので、聴衆に
違和感を与えずに演奏可能となる。According to the power amplifier circuit of the present invention, for example, when an abnormality occurs in the first power amplifier 3, the first and second speakers 9A and 9B are connected in parallel to the second power amplifier 4. Since the load impedance viewed from the second power amplifier 4 is halved and the driving current is doubled for driving, it is possible to emit a sound having an output substantially equal to that in a normal state, so that the audience does not feel discomfort. You can play.
【0015】[0015]
【発明の実施の形態】以下、本発明の電力増幅回路1の
一実施例を図1の系統図によって詳記する。尚、本例で
図3及び図4との対応部分には同一符号を付して説明す
る。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the power amplifier circuit 1 of the present invention will be described in detail below with reference to the system diagram of FIG. In the present example, the portions corresponding to those in FIG. 3 and FIG.
【0016】図1で音源2として、例えばCD等のデー
タをアナログ変換して音質調整された入力信号は、互い
に逆相駆動されるBTL構成の第1及び第2の電力増幅
器3及び4に入力される。第1及び第2の電力増幅器3
及び4の出力は第1及び第2のスイッチング手段7及び
8の固定接点b及び可動接片aを介して出力端子T1及
びT2 に直列に接続された略等しいインピーダンスを有
する2つの負荷9A及び9Bであるスピーカに接続され
ている。In FIG. 1, as a sound source 2, an input signal whose sound quality is adjusted by analog-converting data of a CD or the like is input to first and second power amplifiers 3 and 4 of BTL configuration which are driven in opposite phases. To be done. First and second power amplifier 3
The outputs of 4 and 4 are connected in series to the output terminals T1 and T2 via the fixed contacts b and the movable contact pieces a of the first and second switching means 7 and 8 and have two loads 9A and 9B having substantially equal impedances. Is connected to the speaker.
【0017】直列に接続されたスピーカ9A及び9Bの
接続中点には一端を接地(基準)電位に接続した、例えば
単極単投スイッチから成る第3のスイッチング手段10
が接続されている。The third switching means 10 comprising, for example, a single-pole single-throw switch, one end of which is connected to the ground (reference) potential at the connection midpoint of the speakers 9A and 9B connected in series.
Is connected.
【0018】第1及び第2のスイッチング手段7及び8
は、例えば単投双極型スイッチと成され他の固定接点c
は互いに反対側のスイッチング手段8及び7の可動接片
aに接続されている。First and second switching means 7 and 8
Is a single throw double pole type switch, for example, and is composed of another fixed contact c.
Are connected to the movable contact pieces a of the switching means 8 and 7 on the opposite sides.
【0019】第1及び第2の電力増幅器3及び4に異常
が発生したときは、第1及び第2の異常検出回路5及び
5’が夫々第1及び第2のスイッチング制御回路6及び
6’を介して第1及び第2のスイッチング手段7及び8
の可動接片aを固定接点c側に切換制御して可動接片a
を反対側のスイッチング手段8及び7側に切り換えると
共に第3のスイッチング手段10を切換制御するように
第1及び第2の保護回路12及び13が構成されてい
る。When an abnormality occurs in the first and second power amplifiers 3 and 4, the first and second abnormality detection circuits 5 and 5'are respectively the first and second switching control circuits 6 and 6 '. Via the first and second switching means 7 and 8
The movable contact piece a is controlled to be switched to the fixed contact c side so that the movable contact piece a
Are switched to the switching means 8 and 7 on the opposite side, and the first and second protection circuits 12 and 13 are configured to switch and control the third switching means 10.
【0020】上述の構成での本例の動作を説明する。先
ず、第1及び第2の電力増幅器3及び4が共に正常に動
作している場合は第1及び第2の異常検出回路5及び
5’は電力増幅系路の異常を検出していないので第1及
び第2のスイッチング制御回路6及び6’は非動作状態
でスイッチング手段7の可動接片aは固定接点b側に接
している。これらスイッチング手段は通常リレー或いは
トランジスタ等のスイッチング素子を可とする。The operation of this example with the above configuration will be described. First, when both the first and second power amplifiers 3 and 4 are operating normally, the first and second abnormality detection circuits 5 and 5 ′ have not detected an abnormality in the power amplification system path. The first and second switching control circuits 6 and 6'are in a non-operating state, and the movable contact piece a of the switching means 7 is in contact with the fixed contact b side. These switching means can normally be switching elements such as relays or transistors.
【0021】また、第3のスイッチング手段10は常開
状態に保持されるように、第1又は第2のスイッチング
制御回路6又は6’で制御されるので、正常動作時は2
つのスピーカ9A及び9Bは直列に接続され第1及び第
2の電力増幅器2及び3で駆動される。Further, the third switching means 10 is controlled by the first or second switching control circuit 6 or 6'so that it is kept in the normally open state, so that it is set to 2 during normal operation.
The two speakers 9A and 9B are connected in series and are driven by the first and second power amplifiers 2 and 3.
【0022】従って、音源2からの入力信号は第1及び
第2電力増幅器2及び3によって逆相動作されスピーカ
9A及び9BはBTL駆動される。Therefore, the input signal from the sound source 2 is operated in reverse phase by the first and second power amplifiers 2 and 3, and the speakers 9A and 9B are BTL driven.
【0023】次に第1の電力増幅器3に異常が発生した
場合は、第1の異常検出回路5が異常を検出し、異常信
号を第1のスイッチング制御回路6に出力する。従って
第1のスイッチング制御回路6の制御信号に基づいて第
1のスイッチング手段7の可動接片aは反対側の第2の
スイッチング手段8の可動接片aに接続される様に切換
制御されると共にスピーカ9A及び9Bの接続中点は接
地される。Next, when an abnormality occurs in the first power amplifier 3, the first abnormality detection circuit 5 detects the abnormality and outputs an abnormality signal to the first switching control circuit 6. Therefore, switching control is performed based on the control signal of the first switching control circuit 6 so that the movable contact piece a of the first switching means 7 is connected to the movable contact piece a of the second switching means 8 on the opposite side. At the same time, the midpoint of connection between the speakers 9A and 9B is grounded.
【0024】勿論、第2の電力増幅器4側は正常に動作
しているので第2のスイッチング手段8の可動接片aは
固定接点b側に接続されたままであり、第2の電力増幅
器4に供給される音源2からの入力信号は第2のスイッ
チング手段8の固定接点b→第2のスイッチング手段8
の可動接片a→第1のスイッチング手段7の固定接点c
→第1のスイッチング手段7の可動接片a→出力端子T
1 →第1のスピーカ9A→第3のスイッチング手段10
→接地(基準)電位→音源2の接地電位の系路を介して第
1のスピーカ9Aを正常な第2の電力増幅器4で放音さ
せる。Of course, since the second power amplifier 4 side is operating normally, the movable contact piece a of the second switching means 8 is still connected to the fixed contact b side, and the second power amplifier 4 is connected to the second power amplifier 4 side. The input signal supplied from the sound source 2 is the fixed contact b of the second switching means 8 → the second switching means 8
Of the movable contact piece a → the fixed contact point c of the first switching means 7
→ Movable contact piece a of the first switching means 7 → Output terminal T
1 → first speaker 9A → third switching means 10
-> Ground (reference) potential-> The sound of the first speaker 9A is emitted by the normal second power amplifier 4 via the path of the ground potential of the sound source 2.
【0025】一方、第2の電力増幅器4で増幅された入
力信号は第2のスイッチング手段8の固定接点b→第2
のスイッチング手段8の可動接片a→出力端子T2 →第
2のスピーカ9B→第3のスイッチング手段10→接地
(基準)電位→音源2の接地電位の系路を介して第2のス
ピーカ9Bを正常な第2の電力増幅器4で放音させる。On the other hand, the input signal amplified by the second power amplifier 4 is fixed contact b of the second switching means 8 → second
Movable contact a of the switching means 8 → output terminal T2 → second speaker 9B → third switching means 10 → ground
The second speaker 9B is caused to emit sound by the normal second power amplifier 4 via the path of (reference) potential → ground potential of the sound source 2.
【0026】即ち、第1及び第2のスピーカ9A及び9
Bは第2の電力増幅器4に並列に接続され、第2の電力
増幅器4から視た負荷インピーダンスを1/2にし、駆
動電流を2倍にして駆動するため、正常時と略等しい出
力の音を放音可能となるので、聴衆に違和感を与えずに
演奏を終了可能となる。That is, the first and second speakers 9A and 9
B is connected in parallel to the second power amplifier 4, and the load impedance viewed from the second power amplifier 4 is halved and the drive current is doubled to drive. Since the sound can be emitted, it is possible to end the performance without making the audience feel uncomfortable.
【0027】第2の電力増幅器4が異常な場合には上述
したと同様に第2の異常検出回路5’が異常検出し第2
のスイッチング制御回路6’に異常電圧を出力し、第2
のスイッチング制御回路6’は第2のスイッチング手段
8の可動接片aを固定接点c側に切り換えると共に第3
のスイッチング手段10を制御し、第1の電力増幅器3
の系路に第1及び第2スピーカ9A及び9Bを並列接続
し、第1及び第2のスピーカを夫々駆動する様に成され
る。When the second power amplifier 4 is abnormal, the second abnormality detecting circuit 5'detects an abnormality in the same manner as described above.
Abnormal voltage is output to the switching control circuit 6'of
The switching control circuit 6'of switches the movable contact piece a of the second switching means 8 to the fixed contact c side, and
Controlling the switching means 10 of the first power amplifier 3
The first and second speakers 9A and 9B are connected in parallel to the system path to drive the first and second speakers, respectively.
【0028】上述の各実施例ではシングル型電力増幅回
路として説明したが、ステレオ用の電力増幅回路として
は、図2の様にステレオ音源2及び2’に対し2つの左
右電力増幅回路1L及び1Rを並列駆動すればよい。図
2で図1との対応部分には同一符号を付して示し重複説
明は省略するも、第1及び第2のスピーカ9A及び9B
を1組として夫々左右スピーカ9L及び9Rを構成させ
ればよい。In each of the above-mentioned embodiments, the single type power amplifying circuit has been described. However, as a stereo power amplifying circuit, as shown in FIG. 2, two left and right power amplifying circuits 1L and 1R are provided for the stereo sound sources 2 and 2 '. Can be driven in parallel. In FIG. 2, parts corresponding to those in FIG. 1 are denoted by the same reference numerals and duplicate description is omitted, but first and second speakers 9A and 9B
The left and right speakers 9L and 9R may be respectively configured as one set.
【0029】本発明の電力増幅回路によれば、BTL構
成の電力増幅器の1つが異常を生じた場合に電力増幅器
及びスピーカの破損が防止できるだけでなく、片方の電
力増幅器が異常を生じた場合も音切れすることなく他方
の電力増幅器で駆動できると共に、再生出力が低下する
ことなく、正常時と同じ出力で演奏可能なものが得られ
る効果を有するものである。According to the power amplifier circuit of the present invention, not only can the power amplifier and the speaker be prevented from being damaged when one of the BTL-configured power amplifiers is abnormal, but also when one of the power amplifiers is abnormal. The present invention has the effect that the other power amplifier can be driven without interruption of the sound, and the reproduction output is not lowered and can be played with the same output as in the normal state.
【0030】[0030]
【発明の効果】本発明の電力増幅回路によれば、BTL
構成の一方の電力増幅器に異常があってもスピーカから
の再生出力が遮断されて音切れが生じることがないだけ
でなく、正常時と略々同一出力の再生音を出力可能とな
り聴衆に違和感を感じさせない電力増幅回路が得られ
る。According to the power amplifier circuit of the present invention, the BTL
Even if there is an abnormality in one of the power amplifiers in the configuration, not only does the playback output from the speaker be cut off and no sound breaks occur, but it is also possible to output a playback sound with approximately the same output as in the normal state, making the audience feel uncomfortable. A power amplification circuit that does not feel can be obtained.
【図1】本発明の電力増幅回路の一実施例を示す系統
図。FIG. 1 is a system diagram showing an embodiment of a power amplifier circuit of the present invention.
【図2】本発明の電力増幅回路の他の実施例を示す系統
図。FIG. 2 is a system diagram showing another embodiment of the power amplifier circuit of the present invention.
【図3】従来の電力増幅回路の系統図。FIG. 3 is a system diagram of a conventional power amplifier circuit.
【図4】従来の電力増幅回路の他の系統図。FIG. 4 is another system diagram of a conventional power amplifier circuit.
1 電力増幅回路 2,2’ 音源 3,4 第1及び第2の電力増幅器 5,5’ 第1及び第2の異常検出回路 6,6’ 第1及び第2のスイッチング制御回路 7,8 第1及び第2のスイッチング手段 9A,9B 第1及び第2のスピーカ(負荷) 10 第3のスイッチング手段 11 入力回路 12,13 第1及び第2の保護回路 14 BTL 1 Power amplification circuit 2, 2'Sound source 3,4 First and second power amplifier 5,5 'First and second abnormality detection circuit 6,6' First and second switching control circuit 7,8th 1st and 2nd switching means 9A, 9B 1st and 2nd speaker (load) 10 3rd switching means 11 Input circuit 12, 13 1st and 2nd protection circuit 14 BTL
Claims (2)
び第2の電力増幅器の出力側に夫々第1及び第2のスイ
ッチング手段を介して負荷を駆動する様に成した電力増
幅回路に於いて、上記第1及び第2のスイッチング手段
の夫々の出力側を反対側の第2及び第1のスイッチング
手段側に接続すると共に、上記負荷を複数直列に接続す
ると共に接続した複数の負荷の中点に一端が基準電位に
接続された第3のスイッチング手段を接続して成ること
を特徴とする電力増幅回路。1. A power amplifier circuit configured to drive a load on the output sides of first and second power amplifiers that output input signals in opposite phases to each other via first and second switching means, respectively. Where the output sides of the first and second switching means are respectively connected to the opposite second and first switching means sides, and the plurality of loads are connected in series and the plurality of connected loads are connected. A power amplifier circuit comprising a third switching means, one end of which is connected to a reference potential, connected to the middle point.
ピーカをBTL増幅回路の出力端に第1及び第2の負荷
として接続し、一方の増幅器に異常が発生した時、該増
幅器の出力端に接続された前記第1又は第2の負荷を切
り離すとともに直列に接続した第1及び第2の負荷の中
点を基準電位に接続し、異常の発生した増幅器の出力端
から切り離した前記第1若くは第2の負荷を正常な増幅
器の出力端に接続して第1及び第2の負荷を並列に接続
することを特徴とする電力増幅回路。2. A speaker connected in series and having substantially equal characteristics is connected to the output end of a BTL amplifier circuit as a first load and a second load, and when an abnormality occurs in one of the amplifiers, the output end of the amplifier. The first or second load connected to is disconnected and the midpoint of the first and second loads connected in series is connected to a reference potential, and the first is disconnected from the output terminal of the amplifier in which the abnormality has occurred. A power amplifier circuit characterized in that a second load is connected to an output terminal of a normal amplifier to connect the first and second loads in parallel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8040750A JPH09214265A (en) | 1996-02-02 | 1996-02-02 | Power amplifier circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8040750A JPH09214265A (en) | 1996-02-02 | 1996-02-02 | Power amplifier circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH09214265A true JPH09214265A (en) | 1997-08-15 |
Family
ID=12589318
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8040750A Withdrawn JPH09214265A (en) | 1996-02-02 | 1996-02-02 | Power amplifier circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH09214265A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100555274B1 (en) * | 2001-08-13 | 2006-03-03 | 야마하 가부시키가이샤 | Current detection and overcurrent protection for transistors in pulse-width modulation amplifier |
JP2009094635A (en) * | 2007-10-04 | 2009-04-30 | Oki Semiconductor Co Ltd | Audio output device and audio output method |
WO2013094626A1 (en) * | 2011-12-20 | 2013-06-27 | ヤマハ株式会社 | Class-d power amplifier |
WO2023280655A1 (en) * | 2021-07-06 | 2023-01-12 | Robert Bosch Gmbh | Sound reinforcement system and method for the operation thereof |
-
1996
- 1996-02-02 JP JP8040750A patent/JPH09214265A/en not_active Withdrawn
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100555274B1 (en) * | 2001-08-13 | 2006-03-03 | 야마하 가부시키가이샤 | Current detection and overcurrent protection for transistors in pulse-width modulation amplifier |
JP2009094635A (en) * | 2007-10-04 | 2009-04-30 | Oki Semiconductor Co Ltd | Audio output device and audio output method |
WO2013094626A1 (en) * | 2011-12-20 | 2013-06-27 | ヤマハ株式会社 | Class-d power amplifier |
JP2013131815A (en) * | 2011-12-20 | 2013-07-04 | Yamaha Corp | Class d power amplifier |
CN103999363A (en) * | 2011-12-20 | 2014-08-20 | 雅马哈株式会社 | Class-D power amplifier |
US20140301577A1 (en) * | 2011-12-20 | 2014-10-09 | Yamaha Corporation | Class-d power amplifier |
US9634623B2 (en) | 2011-12-20 | 2017-04-25 | Yamaha Corporation | Class-D power amplifier |
CN103999363B (en) * | 2011-12-20 | 2017-12-15 | 雅马哈株式会社 | D-type power amplifier |
WO2023280655A1 (en) * | 2021-07-06 | 2023-01-12 | Robert Bosch Gmbh | Sound reinforcement system and method for the operation thereof |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030506 |