JPH0287799A - Speaker drive circuit device - Google Patents
Speaker drive circuit deviceInfo
- Publication number
- JPH0287799A JPH0287799A JP23951988A JP23951988A JPH0287799A JP H0287799 A JPH0287799 A JP H0287799A JP 23951988 A JP23951988 A JP 23951988A JP 23951988 A JP23951988 A JP 23951988A JP H0287799 A JPH0287799 A JP H0287799A
- Authority
- JP
- Japan
- Prior art keywords
- drive circuit
- circuit device
- speaker
- diode
- transformer
- 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
- 238000004804 winding Methods 0.000 claims description 4
- 230000003071 parasitic effect Effects 0.000 abstract description 10
- 238000000926 separation method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Landscapes
- Circuit For Audible Band Transducer (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、トランス結合によるスピーカ駆動回路装置
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a speaker drive circuit device using transformer coupling.
第３図に従来のスピーカ駆動回路装置を示す。 FIG. 3 shows a conventional speaker drive circuit device.
図において、１はスピーカ、２はインピーダンスマツチ
ングを行うトランス、３は第１の駆動回路装置、４は第
２の駆動回路装置、５は電源端子である。第１の駆動回
路装置３は、６〜１４で構成されており、それぞれ６は
ＧＮＤ、７．８は駆動用トランジスタ、９．ｌＯは入力
信号端子、１１．１２は出力信号端子、１３．１４は寄
生ダイオードである。入力信号端子９，１０には、互い
に逆相の信号が人力され、その結果、出力信号端子１１
．１２の信号により、トランス２が差動にて駆動される
。In the figure, 1 is a speaker, 2 is a transformer that performs impedance matching, 3 is a first drive circuit device, 4 is a second drive circuit device, and 5 is a power supply terminal. The first drive circuit device 3 is composed of 6 to 14, each of which includes GND 6, a drive transistor 7.8, and 9. 10 is an input signal terminal, 11.12 is an output signal terminal, and 13.14 is a parasitic diode. The input signal terminals 9 and 10 are manually supplied with signals having opposite phases to each other, and as a result, the output signal terminal 11
．． The transformer 2 is differentially driven by the 12 signals.
駆動回路装置３は通常、半導体集積回路装置にて構成さ
れており、この場合、素子分離構造による寄生ダイオー
ド１３．１４が、トランジスタ７゜８のコレクタ電極と
、ＧＮＤ６との間に存在する。The drive circuit device 3 is usually constituted by a semiconductor integrated circuit device, and in this case, parasitic diodes 13 and 14 with an element isolation structure exist between the collector electrode of the transistor 7.8 and the GND6.
第３図の回路は、２系統以上のスピーカ駆動回路装置に
より、スピーカを駆動する回路であり、４は第２の駆動
回路装置である。即ち、第１．第２の駆動回路装置３．
４はいずれか１つが動作状態となり、その時他方は、非
動作状態となっているものである。The circuit shown in FIG. 3 is a circuit that drives speakers using two or more systems of speaker drive circuit devices, and 4 is a second drive circuit device. That is, 1st. Second drive circuit device 3.
4, one of them is in an operating state, while the other is in an inactive state.
従来のスピーカ駆動回路装置は以上のように構成されて
いるが、一方の駆動回路装置による駆動時に他方の駆動
回路装置が負荷となり、スピーカ出力レベルが減衰して
しまうという問題点があった。即ち、第２の駆動回路装
置４にて、スピーカｌを駆動している場合、第１の駆動
回路装置３は非動作状態となっており、その駆動用トラ
ンジスタ７．８はオフ状態となっているが、該回路装置
３の寄生ダイオード１３．１４のためＧＮＤ６から寄生
ダイオード１３．１４を介して電源端子５へのループが
できているため、第２の駆動回路装置４からみて第１の
駆動回路装置３が負荷となり、スピーカ出力レベルが減
衰してしまうという問題点があった。Although conventional speaker drive circuit devices are configured as described above, there is a problem in that when one drive circuit device is driven, the other drive circuit device acts as a load and the speaker output level is attenuated. That is, when the second drive circuit device 4 is driving the speaker l, the first drive circuit device 3 is in an inactive state, and its driving transistor 7.8 is in an off state. However, due to the parasitic diodes 13.14 of the circuit device 3, a loop is formed from the GND 6 to the power supply terminal 5 via the parasitic diodes 13.14, so that the first drive circuit device 4 There is a problem in that the circuit device 3 becomes a load and the speaker output level is attenuated.
この発明は上記のような問題点を解消するためになされ
たもので、スピーカ出力レベルの減衰を防止することが
できるスピーカ駆動回路装置を得ることを目的にする。The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a speaker drive circuit device that can prevent attenuation of the speaker output level.
この発明に係るスピーカ駆動回路装置は、トランスの一
次側巻線の一端もしくは中点タップへの電源電圧の供給
を、ダイオードを介して行うようにしたものである。In the speaker drive circuit device according to the present invention, power supply voltage is supplied to one end or the center tap of the primary winding of the transformer via a diode.
この発明に係るスピーカ駆動回路装置では、トランスへ
の電源電圧の供給をダイオードを介して行うようにした
ので、一方の駆動回路装置が非動作状態のとき、他方の
駆動回路装置の寄生ダイオードによりできるループは切
断され、負荷としては見えなくなるため、スピーカ出力
レベルの減衰を防止することができる。In the speaker drive circuit device according to the present invention, the power supply voltage is supplied to the transformer through the diode, so that when one drive circuit device is in a non-operating state, the parasitic diode of the other drive circuit device causes Since the loop is cut and becomes invisible as a load, attenuation of the speaker output level can be prevented.
以下、この発明の一実施例を図について説明する。 An embodiment of the present invention will be described below with reference to the drawings.
第１図において、１−１４は、第３図と同一の構成部分
を示す。１５はトランス２の一次側巻線の中点タップ・
＼の電源電圧の供給を、これを介して行うループ切断用
ダイオードである。In FIG. 1, 1-14 indicates the same components as in FIG. 3. 15 is the center tap of the primary winding of transformer 2.
This is a loop cutting diode through which the power supply voltage of \ is supplied.
次に動作について説明する。Next, the operation will be explained.
従来例の場合と同様に、第２の駆動回路装置４によって
スピーカを駆動し、第１の駆動回路装置３は非動作状態
となっている場合を考える。この場合、ＧＮＤ６より寄
生ダイオード１３．１４を介して電源端子５へのループ
はダイオード１５により阻止される。したがって、第２
の駆動回路装置４からみて非動作状態の第１の駆動回路
装置３は負荷としては見えなくなり、スピーカ出力レベ
ルが減衰することを防止できる。As in the case of the conventional example, consider a case where the second drive circuit device 4 drives the speaker and the first drive circuit device 3 is in an inactive state. In this case, a loop from GND6 to power supply terminal 5 via parasitic diodes 13 and 14 is blocked by diode 15. Therefore, the second
When viewed from the drive circuit device 4, the first drive circuit device 3 in the inactive state no longer appears as a load, and it is possible to prevent the speaker output level from attenuating.
また、第２図は本発明の他の実施例を示す。上記第１の
実施例は、各駆動回路装置３．４が差動によりトランス
２の駆動を行う差動による駆動回路装置の例であったが
、本実施例の駆動回路装置は、シングルエンド型のもの
であり、この場合トランスの一次側巻線の一端へ電源電
圧の供給を、行うものであり、これにおいても、上記実
施例と同様の効果を奏する。Further, FIG. 2 shows another embodiment of the present invention. The first embodiment described above was an example of a differential drive circuit device in which each drive circuit device 3.4 differentially drives the transformer 2, but the drive circuit device of this embodiment is of a single-ended type. In this case, the power supply voltage is supplied to one end of the primary winding of the transformer, and in this case as well, the same effects as in the above embodiment are achieved.
以上のように、この発明によれば、少なくとも２系統以
上の駆動回路を有するトランス結合型スピーカ駆動回路
装置において、電ａ端子よりダイオードを介して、トラ
ンスに電源電圧を供給するように構成したので、一方の
駆動回路装置が非動作状態のときでも、他方の回路の寄
生ダイオードによるループの形成を阻止でき、スピーカ
出力レベルの減衰を防止できる効果がある。As described above, according to the present invention, in a transformer-coupled speaker drive circuit device having at least two or more systems of drive circuits, the power supply voltage is supplied to the transformer from the electric terminal A through the diode. Even when one drive circuit device is in a non-operating state, it is possible to prevent the formation of a loop due to the parasitic diode of the other circuit, and there is an effect that attenuation of the speaker output level can be prevented.
第１図は本発明の一実施例によるスピーカ駆動回路装置
の回路図、第２図は本発明の他の実施例によるスピーカ
駆動回路装置の回路図、第３図は従来のスピーカ駆動回
路装置の回路図である。
図において、１はスピーカ、２はインピーダンスマツチ
ングを行うトランス、３は第１の駆動回路装置、４は第
２の駆動回路装置、５は電源端子、６はＧＮＤ、７．８
は駆動用トランジスタ、９１０は人力信号端子、１１．
１２は出力信号端子、１３．１４は寄生ダイオードであ
る。
なお図中同一符号は同−又は相当部分を示す。FIG. 1 is a circuit diagram of a speaker drive circuit device according to an embodiment of the present invention, FIG. 2 is a circuit diagram of a speaker drive circuit device according to another embodiment of the present invention, and FIG. 3 is a circuit diagram of a conventional speaker drive circuit device. It is a circuit diagram. In the figure, 1 is a speaker, 2 is a transformer that performs impedance matching, 3 is a first drive circuit device, 4 is a second drive circuit device, 5 is a power supply terminal, 6 is GND, 7.8
910 is a human power signal terminal; 11. is a driving transistor; 910 is a human power signal terminal;
12 is an output signal terminal, and 13 and 14 are parasitic diodes. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (1)
ス結合型スピーカ駆動回路装置において、トランスの一
次側巻線の一端もしくは中点タップへの電源電圧の供給
を、ダイオードを介して行うようにしたことを特徴とす
るスピーカ駆動回路装置。(1) In a transformer-coupled speaker drive circuit device having at least two drive circuits, power supply voltage is supplied to one end or center tap of the primary winding of the transformer via a diode. A speaker drive circuit device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23951988A JPH0287799A (en) | 1988-09-24 | 1988-09-24 | Speaker drive circuit device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23951988A JPH0287799A (en) | 1988-09-24 | 1988-09-24 | Speaker drive circuit device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0287799A true JPH0287799A (en) | 1990-03-28 |
Family
ID=17046005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23951988A Pending JPH0287799A (en) | 1988-09-24 | 1988-09-24 | Speaker drive circuit device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0287799A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0686383A (en) * | 1992-01-24 | 1994-03-25 | Man Ho Kim | Multiple output transformer network of acoustic playback system |
-
1988
- 1988-09-24 JP JP23951988A patent/JPH0287799A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0686383A (en) * | 1992-01-24 | 1994-03-25 | Man Ho Kim | Multiple output transformer network of acoustic playback system |
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