JPH0339929Y2 - - Google Patents
Info
- Publication number
- JPH0339929Y2 JPH0339929Y2 JP1983140747U JP14074783U JPH0339929Y2 JP H0339929 Y2 JPH0339929 Y2 JP H0339929Y2 JP 1983140747 U JP1983140747 U JP 1983140747U JP 14074783 U JP14074783 U JP 14074783U JP H0339929 Y2 JPH0339929 Y2 JP H0339929Y2
- Authority
- JP
- Japan
- Prior art keywords
- switch
- amplifier
- state
- output terminal
- amplifiers
- 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.)
- Expired
Links
- 238000004804 winding Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000005283 ground state Effects 0.000 description 1
Landscapes
- Amplifiers (AREA)
Description
【考案の詳細な説明】 本考案はBTL接続可能な増幅装置に関する。[Detailed explanation of the idea] The present invention relates to an amplifier capable of BTL connection.
従来、１対の増幅器を負荷スピーカの両端に接
続したBTL（balanced transformer less）接続
増幅装置が知られている。 BACKGROUND ART Conventionally, a BTL (balanced transformer less) connected amplifier device in which a pair of amplifiers is connected to both ends of a load speaker is known.
本考案は上記１対の増幅器の接続を変化させて
BTL増幅装置を一対の増幅器によるステレオ又
は並列増幅装置としても利用出来る様にしたもの
で以下実施例に従つて詳細に説明する。 The present invention changes the connection of the above pair of amplifiers.
The BTL amplification device can be used as a stereo or parallel amplification device using a pair of amplifiers, and will be described in detail below with reference to embodiments.
第１図及び第２図は本考案の一実施例である。
第１図において、１及び１６は入力信号源を示
し、この入力信号源１６はスイツチ９の一方の固
定接点９ａに接続され、入力信号源１が第１の増
幅器（正相増幅器）２及びスイツチ９の他方の固
定接点９ｂに接続される。スイツチ９の可動接点
９ｃは反転増幅器３の入力端子並びに第１の選択
スイツチ４の一方の固定接点４ａに接続される。
反転増幅器３の出力端子がスイツチ４の他方の固
定接点４ｂに接続される。５は第２の増幅器を示
し、この第２の増幅器（正相増幅器）５の入力端
子にスイツチ４の可動接点４ｃが接続される。６
及び７は、それぞれ第１の選択スイツチ４と連動
する第２及び第３の選択スイツチを示し、スイツ
チ６の可動接点６ｃが第１の増幅器２の出力端子
に接続される。スイツチ７の一方の固定接点７ａ
は接地され、他方の固定接点７ｂ及びスイツチ６
の一方の固定接点６ａが第２の増幅器５の出力端
子に接続される。増幅器２の出力端子はさらにス
イツチ８を介して一方の外部出力端子１０に接続
される。スイツチ６の他方の固定接点６ｂは遊接
点である。スイツチ７の可動接点７ｃは他方の外
部出力端子１１に接続される。第１図に示した増
幅装置の各スイツチは、第２図に示す制御回路に
よつて、所定の接続状態となるように制御され
る。 1 and 2 show an embodiment of the present invention.
In FIG. 1, 1 and 16 indicate input signal sources, this input signal source 16 is connected to one fixed contact 9a of the switch 9, and the input signal source 1 is connected to the first amplifier (positive phase amplifier) 2 and the switch. 9 is connected to the other fixed contact 9b. The movable contact 9c of the switch 9 is connected to the input terminal of the inverting amplifier 3 and to one fixed contact 4a of the first selection switch 4.
The output terminal of the inverting amplifier 3 is connected to the other fixed contact 4b of the switch 4. Reference numeral 5 designates a second amplifier, and the input terminal of the second amplifier (positive phase amplifier) 5 is connected to the movable contact 4c of the switch 4. 6
and 7 indicate second and third selection switches that operate in conjunction with the first selection switch 4, respectively, and the movable contact 6c of the switch 6 is connected to the output terminal of the first amplifier 2. One fixed contact 7a of switch 7
is grounded, and the other fixed contact 7b and switch 6
One fixed contact 6a of is connected to the output terminal of the second amplifier 5. The output terminal of the amplifier 2 is further connected to one external output terminal 10 via a switch 8. The other fixed contact 6b of the switch 6 is a free contact. The movable contact 7c of the switch 7 is connected to the other external output terminal 11. Each switch of the amplifier shown in FIG. 1 is controlled by a control circuit shown in FIG. 2 so as to be in a predetermined connection state.
第２図において、４，６，７，８及び
９はそれぞれ第１図にスイツチ４，６，７，８
及び９として示した各リレーの各巻線を示し、こ
のうち、巻線４，６，８及び９の一端は
制御電源端子＋Ｂに接続される。巻線４，６
及び９の他端はそれぞれダイオード２０，２１
及び２２を介して選択制御スイツチ１２の固定接
点１２ｂに接続される。巻線６の他端は又ダイ
オード１９を介してスイツチ１２の固定接点１２
ｃに接続され、巻線９の他端はスイツチ１２の
固定接点１２ａにダイオード２３を介して接続さ
れる。可動接点１２ｄは接地されている。１３は
npn型トランジスタを示し、このトランジスタ１
３のコレクタと電源端子＋Ｂとの間にリレーの巻
線８が接続され、エミツタは接地される。トラ
ンジスタ１３のベースは抵抗器１４を介して電源
端子１１に接続されると共に、ベースとアース間
にコンデンサ１５が接続される。巻線７はpnp
型トランジスタ１７のコレクタと第２の選択制御
スイツチ１８の固定接点１８ｂ並びに１８ｃとの
間に接続される。トランジスタ１７のベースはト
ランジスタ１３のコレクタに直結され、エミツタ
は電源端子１１に接続される。スイツチ１２と連
動するスイツチ１８の固定接点１８ａは遊接点で
あり、可動接点１８ｄは接地される。 In Figure 2, 4, 6, 7, 8 and 9 are the switches 4, 6, 7, 8 and 9 in Figure 1 respectively.
and 9, each of which has one end connected to the control power terminal +B. Windings 4, 6
The other ends of 9 and 9 are diodes 20 and 21, respectively.
and 22 to the fixed contact 12b of the selection control switch 12. The other end of the winding 6 is also connected to the fixed contact 12 of the switch 12 via a diode 19.
The other end of the winding 9 is connected to the fixed contact 12a of the switch 12 via a diode 23. The movable contact 12d is grounded. 13 is
Indicates an npn type transistor, and this transistor 1
The winding 8 of the relay is connected between the collector of 3 and the power supply terminal +B, and the emitter is grounded. The base of the transistor 13 is connected to the power supply terminal 11 via a resistor 14, and a capacitor 15 is connected between the base and ground. Winding 7 is pnp
It is connected between the collector of type transistor 17 and fixed contacts 18b and 18c of second selection control switch 18. The base of transistor 17 is directly connected to the collector of transistor 13, and the emitter is connected to power supply terminal 11. The fixed contact 18a of the switch 18 that interlocks with the switch 12 is a free contact, and the movable contact 18d is grounded.
以上の構成による動作を説明する。選択制御ス
イツチ１２が図示の状態にあるとき、増幅装置の
主電源スイツチ（図示せず）がオンされると、直
ちに制御電源端子＋Ｂに直流電圧が供給されて、
巻線４，６及び９が付勢され、スイツチ
４，６及び９は第１図に示した切換状態になる。
しかし、主電源スイツチの投入の当初に於いて
は、トランジスタ１３のベース電位は、抵抗器１
４及びコンデンサ１５から成る時定数回路の存在
により、未だトランジスタ１３をオンさせるに到
らないので、巻線８及び７は付勢されず、従
つて、スイツチ８及び７は第１図に示したミユー
テイング状態にある。 The operation of the above configuration will be explained. When the selection control switch 12 is in the state shown, when the main power switch (not shown) of the amplifier is turned on, a DC voltage is immediately supplied to the control power terminal +B.
Windings 4, 6 and 9 are energized and switches 4, 6 and 9 are placed in the switching state shown in FIG.
However, when the main power switch is initially turned on, the base potential of the transistor 13 is
Due to the presence of the time constant circuit consisting of 4 and capacitor 15, windings 8 and 7 are not energized since it is not yet possible to turn on transistor 13, so that switches 8 and 7 are not energized as shown in FIG. In a state of mutating.
主電源スイツチの投入後、各増幅器２及び５が
正常動作するに要する例えば数秒の所定時間が経
過すると、トランジスタ１３のベース電位が上昇
し、トランジスタ１３がオンになると、巻線８
及び７が付勢されて、スイツチ８及び７が閉じ
てミユーテイングが解除され、両増幅器２及び５
と外部出力端子１０及び１１とが接続されるの
で、外部出力端子１０及び１１の間にスピーカを
接続すればBTL接続の状態になる。 After turning on the main power switch, when a predetermined time period of several seconds, which is required for each amplifier 2 and 5 to operate normally, has elapsed, the base potential of the transistor 13 rises, and when the transistor 13 is turned on, the winding 8
and 7 are energized, switches 8 and 7 are closed and muting is released, and both amplifiers 2 and 5 are energized.
Since the external output terminals 10 and 11 are connected, if a speaker is connected between the external output terminals 10 and 11, a BTL connection is established.
選択制御スイツチ１２及び１８の可動接点１２
ｄ及び１８ｄが固定接点１２ｃ及び１８ｃ側にあ
る場合は、巻線４及び９が付勢されず、巻線
６，７及び８が付勢されるので、ミユーテ
イング解除後はスイツチ４，７，８及び９は第１
図と逆の切換状態になる。従つて外部出力端子１
０及び１１にそれぞれスピーカを接続すれば両増
幅器２及び５はステレオの左右チヤンネル増幅器
として入力信号１及び１６をそれぞれ別々に増幅
する。 Movable contacts 12 of selection control switches 12 and 18
When d and 18d are on the fixed contacts 12c and 18c side, windings 4 and 9 are not energized and windings 6, 7, and 8 are energized, so that after muting is released, switches 4, 7, and 8 are energized. and 9 is the first
The switching state will be opposite to that shown in the diagram. Therefore, external output terminal 1
When speakers 0 and 11 are respectively connected, both amplifiers 2 and 5 amplify input signals 1 and 16 separately as stereo left and right channel amplifiers.
次に選択制御スイツチ１２及び１８が固定接点
１２ａ及び１８ａを選択する場合、巻線９及び
８は付勢されるが、巻線４，６及び７は
付勢されない。従つて、この場合、スイツチ７及
び９のみが第１図の場合と変りなく、他のスイツ
チ４，６及び８は共に第１図と逆の切換状態とな
る。従つてスピーカを外部出力端子１０及び１１
の間に接続すれば、両増幅器２及び５は並列増幅
器として動作する。 If selection control switches 12 and 18 then select fixed contacts 12a and 18a, windings 9 and 8 will be energized, but windings 4, 6 and 7 will not be energized. Therefore, in this case, only the switches 7 and 9 are the same as in the case of FIG. 1, and the other switches 4, 6 and 8 are all in the reverse switching state as in FIG. Therefore, the speakers are connected to external output terminals 10 and 11.
If connected between them, both amplifiers 2 and 5 operate as parallel amplifiers.
なお、スイツチ７は上述の様に選択スイツチと
して動作するばかりでなく、スイツチ８と協働し
てミユーテイングスイツチとしても動作する。即
ち、上述の様に主電源スイツチのオン時巻線８
及び７を共に消勢して、出力端子１０及び１１
と両増幅器２及び５とを分離し保護する。従つて
スイツチ７に直列にミユーテイング専用スイツチ
を設ける必要がないので、ミユーテイングスイツ
チの接触抵抗による出力インピーダンスの増加を
最小限におさえることが出来る。又ミユーテイン
グスイツチとして働くスイツチ７及び８は周知の
如く、電源オン直後のみでなく例えばスピーカ端
の短絡等を検知して動作する様にしてもよい。 Note that the switch 7 not only operates as a selection switch as described above, but also operates as a muting switch in cooperation with the switch 8. That is, as mentioned above, when the main power switch is turned on, the winding 8
and 7 are both deenergized, and output terminals 10 and 11 are output.
and both amplifiers 2 and 5 are separated and protected. Therefore, since there is no need to provide a switch exclusively for muting in series with switch 7, an increase in output impedance due to contact resistance of the muting switch can be suppressed to a minimum. Further, as is well known, the switches 7 and 8 which function as muting switches may operate not only immediately after the power is turned on, but also upon detecting, for example, a short circuit at the speaker end.
以上のように本考案によれば一対の増幅器を並
列出力接続、ステレオ接続及びBTL接続に選択
し切り替えたとき、ミユーテイングスイツチとし
て開放動作時に第２の外部の出力端子を接地しス
テレオ接続及びBTL接続時第２の増幅器の出力
をミユーテイング動作させ、同じ接地状態では並
列出力接続時負荷を接続してこのスイツチを兼用
させ、増幅器の出力端と負荷との間を簡単な回路
でそれぞれの状態に接続すると共にミユーテイン
グ動作状態に切換えることができる。 As described above, according to the present invention, when a pair of amplifiers is selected and switched to parallel output connection, stereo connection, or BTL connection, the second external output terminal is grounded during open operation as a muting switch, and stereo connection or BTL connection is selected. When connected, the output of the second amplifier is muted, and in the same ground state, when connecting parallel outputs, the load is connected and this switch also functions, and a simple circuit is used to connect the output terminal of the amplifier and the load to each state. It is possible to switch to the muting operation state as soon as the connection is made.
第１図は本考案による増幅装置の一実施例を示
す結線図、第２図は第１図に示した増幅装置の制
御回路を示す結線図である。
２，５……第１及び第２の増幅器、３……反転
増幅器、４，６，７，９……選択スイツチ、１
２，１８……選択制御スイツチ。
FIG. 1 is a wiring diagram showing an embodiment of an amplifier according to the present invention, and FIG. 2 is a wiring diagram showing a control circuit of the amplifier shown in FIG. 2, 5...First and second amplifiers, 3...Inverting amplifier, 4, 6, 7, 9...Selection switch, 1
2, 18...Selection control switch.
Claims (1)
幅器の各入力端子を共通にして出力同志を同相で
結合する第１の状態と逆相で分離する第２の状態
と、上記各入力端子を分離して出力同志を同相で
分離する第３の状態とのいずれかを選択する選択
手段と、少くとも上記第１の増幅器の出力を第１
の外部出力端子に接続するミユーテイングスイツ
チと、第２の外部出力端子を上記第１の状態にお
いては接地し、上記第２及び第３の状態において
は上記第２の増幅器の出力に接続するように上記
選択手段と連動して切換える切換手段とを具備
し、上記切換手段は上記ミユーテイングスイツチ
の開放時に上記第２の外部出力端子を接地するよ
うにしたことを特徴とする増幅装置。 a first state in which the input terminals of the first and second amplifiers are common and their outputs are coupled in the same phase; and a second state in which the outputs are separated in opposite phase; selection means for selecting either a third state in which the input terminals are separated and the outputs are separated in phase; and at least the output of the first amplifier is
a muting switch connected to an external output terminal of the amplifier, and a second external output terminal, which are grounded in the first state and connected to the output of the second amplifier in the second and third states. and a switching means for switching in conjunction with the selection means, the switching means grounding the second external output terminal when the muting switch is opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14074783U JPS6047316U (en) | 1983-09-09 | 1983-09-09 | Amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14074783U JPS6047316U (en) | 1983-09-09 | 1983-09-09 | Amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6047316U JPS6047316U (en) | 1985-04-03 |
| JPH0339929Y2 true JPH0339929Y2 (en) | 1991-08-22 |
Family
ID=30315018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14074783U Granted JPS6047316U (en) | 1983-09-09 | 1983-09-09 | Amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6047316U (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4674474B2 (en) * | 2005-02-24 | 2011-04-20 | パナソニック株式会社 | Parallel drive bi-amp switching circuit |
| JP4949193B2 (en) * | 2007-10-23 | 2012-06-06 | ティーオーエー株式会社 | Audio power amplifier |
| US7986187B1 (en) * | 2010-03-04 | 2011-07-26 | Bose Corporation | Versatile audio power amplifier |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57198112U (en) * | 1981-06-11 | 1982-12-16 |
-
1983
- 1983-09-09 JP JP14074783U patent/JPS6047316U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6047316U (en) | 1985-04-03 |
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