JPH06337680A - Resonance type buzzer driving device - Google Patents

Resonance type buzzer driving device

Info

Publication number
JPH06337680A
JPH06337680A JP5126579A JP12657993A JPH06337680A JP H06337680 A JPH06337680 A JP H06337680A JP 5126579 A JP5126579 A JP 5126579A JP 12657993 A JP12657993 A JP 12657993A JP H06337680 A JPH06337680 A JP H06337680A
Authority
JP
Japan
Prior art keywords
signal
resonance type
resonance
circuit
type buzzer
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.)
Granted
Application number
JP5126579A
Other languages
Japanese (ja)
Other versions
JP3243060B2 (en
Inventor
Kazunari Goto
一成 後藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Toshiba Electronic Device Solutions Corp
Original Assignee
Toshiba Corp
Toshiba Microelectronics Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Toshiba Microelectronics Corp filed Critical Toshiba Corp
Priority to JP12657993A priority Critical patent/JP3243060B2/en
Publication of JPH06337680A publication Critical patent/JPH06337680A/en
Application granted granted Critical
Publication of JP3243060B2 publication Critical patent/JP3243060B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To provide a resonance type buzzer driving device eliminating switching drive by an output transistor and suitable for an integrated circuit. CONSTITUTION:This device is provided with a signal synthesis circuit 12 synthesizing a tone signal A deciding a tone of a resonance type buzzer 11 and a resonance signal B with a prescribed frequency, and a voltage follower circuit 13 driving the resonance type buzzer 11 based on a synthesis signal C from the signal synthesis circuit 12.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は例えば自動車等におい
て警告音を発生するために用いられる共振型ブザーを駆
動する共振型ブザー駆動装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resonance type buzzer driving device for driving a resonance type buzzer used to generate a warning sound in an automobile or the like.

【0002】[0002]

【従来の技術】一般に共振型ブザーは、音色を決定する
音色信号とその共振型ブザー特有の共振周波数を持つ共
振信号を用いて駆動される。図4は従来の共振型ブザー
駆動装置の回路図である。音色信号Aは演算増幅器(オ
ペアンプ)41の正極性(+)の入力端子に供給される。
この演算増幅器41の出力端子の信号は抵抗42を介して出
力用のNPNトランジスタ43のベースに供給される。こ
のトランジスタ43のコレクタは電源電圧VCCの印加点
に接続されており、そのエミッタには共振型ブザー(B
Z)44の一端が接続されている。このブザー44の他端は
アース電圧GNDの印加点に接続されている。また、ブ
ザー44の一端と上記演算増幅器41の負極性(−)の入力
端子との間には抵抗45が、ブザー44の一端とアース電圧
GNDの印加点との間にはクランプ用のダイオード46が
それぞれ接続されている。
2. Description of the Related Art Generally, a resonance type buzzer is driven by using a tone color signal for determining a tone color and a resonance signal having a resonance frequency peculiar to the resonance type buzzer. FIG. 4 is a circuit diagram of a conventional resonance type buzzer driving device. The tone color signal A is supplied to a positive (+) input terminal of an operational amplifier (op amp) 41.
The signal at the output terminal of the operational amplifier 41 is supplied to the base of the output NPN transistor 43 via the resistor 42. The collector of this transistor 43 is connected to the application point of the power supply voltage VCC, and its emitter has a resonance type buzzer (B
Z) 44 is connected at one end. The other end of the buzzer 44 is connected to the application point of the ground voltage GND. A resistor 45 is provided between one end of the buzzer 44 and the negative (-) input terminal of the operational amplifier 41, and a clamp diode 46 is provided between one end of the buzzer 44 and the ground voltage GND application point. Are connected respectively.

【0003】共振信号Bは抵抗47を介してNPNトラン
ジスタ48のベースに供給される。このトランジスタ48の
ベースとアース電圧GNDの印加点との間には抵抗49が
接続されている。上記トランジスタ48のコレクタは上記
出力用のトランジスタ43のベースに接続されている。そ
して、上記音色信号及び共振信号として例えば図5の波
形図に示すような信号が供給される。
The resonance signal B is supplied to the base of the NPN transistor 48 via the resistor 47. A resistor 49 is connected between the base of the transistor 48 and the application point of the ground voltage GND. The collector of the transistor 48 is connected to the base of the output transistor 43. Then, as the tone color signal and the resonance signal, for example, signals as shown in the waveform diagram of FIG. 5 are supplied.

【0004】上記構成でなる駆動装置において、ブザー
44は音色信号Aを入力とする演算増幅器41と出力用のト
ランジスタ43からなる増幅回路によって駆動され、共振
信号Bに応じて出力用のトランジスタ43がスイッチング
されることにより、ブザー44が共鳴駆動されている。
In the drive device having the above structure, the buzzer
Reference numeral 44 is driven by an amplifier circuit including an operational amplifier 41 that receives the tone color signal A and an output transistor 43, and the output transistor 43 is switched according to the resonance signal B, so that the buzzer 44 is resonantly driven. ing.

【0005】[0005]

【発明が解決しようとする課題】ところで、共振型ブザ
ーは一般に誘導性負荷であり、上記従来の駆動装置では
この誘導性負荷が出力用のトランジスタ43によってスイ
ッチング駆動されているために、このトランジスタ43が
オフ状態となり、ブザー44の一端が高インピーダンス状
態となるときに、図5の波形図に示すようにブザー44の
一端の電圧信号Cには逆起電圧(GNDよりも低い負の
電圧)が生じる。この逆起電圧はGND側の電源に揺れ
を発生させ、ノイズ源となるために他のユニットに悪影
響を与える。
By the way, the resonance type buzzer is generally an inductive load, and since the inductive load is switching-driven by the output transistor 43 in the conventional driving device, the transistor 43 is used. Is turned off and one end of the buzzer 44 is in a high impedance state, a counter electromotive voltage (negative voltage lower than GND) is present in the voltage signal C at one end of the buzzer 44 as shown in the waveform diagram of FIG. Occurs. This back electromotive voltage causes fluctuations in the power supply on the GND side, which becomes a noise source and adversely affects other units.

【0006】このため、従来装置では図示するように、
ブザー44の一端とGNDとの間にクランプ用のダイオー
ド46を接続してこの逆起電圧を吸収するようにしてい
る。しかし、このダイオード46として素子サイズがある
程度大きなものが必要であるため、他の回路と共に集積
回路化することは困難であり、この結果、部品点数が増
大するという問題がある。
Therefore, in the conventional device, as shown in the figure,
A clamp diode 46 is connected between one end of the buzzer 44 and GND to absorb the counter electromotive voltage. However, since the diode 46 needs to have a large element size to some extent, it is difficult to form an integrated circuit with other circuits, and as a result, there is a problem that the number of parts increases.

【0007】また、上記逆起電圧による演算増幅器41の
寄生対策、例えばラッチアップや寄生素子による誤動作
防止を図るために、従来装置では上記抵抗45を設ける必
要があり、このことが集積回路化する際のチップ面積の
増大を招いている。
Further, in order to take measures against the parasitic effect of the operational amplifier 41 due to the back electromotive force, for example, to prevent malfunction due to latch-up and parasitic elements, it is necessary to provide the resistor 45 in the conventional device, which makes an integrated circuit. This leads to an increase in chip area.

【0008】さらに、上記のような逆起電圧が発生する
ために、集積回路化する際にチップ上のパターン・レイ
アウトに工夫が必要になるという問題がある。この発明
は上記のような事情を考慮してなされたものであり、そ
の目的は集積回路化に適した共振型ブザー駆動装置を提
供することにある。
Further, since the counter electromotive voltage as described above is generated, there is a problem that a pattern layout on a chip needs to be devised when integrated into an integrated circuit. The present invention has been made in consideration of the above circumstances, and an object thereof is to provide a resonance type buzzer driving device suitable for integration into an integrated circuit.

【0009】[0009]

【課題を解決するための手段】この発明の共振型ブザー
駆動装置は、共振型ブザーの音色を決定する音色信号と
所定周波数の共振信号とを合成する信号合成回路と、上
記信号合成回路の出力信号に基づいて上記共振型ブザー
を駆動する電圧フォロワ回路とを具備したことを特徴と
する。
SUMMARY OF THE INVENTION A resonance type buzzer driving device of the present invention comprises a signal synthesizing circuit for synthesizing a tone color signal for determining a tone color of a resonance type buzzer and a resonance signal of a predetermined frequency, and an output of the signal synthesizing circuit. A voltage follower circuit for driving the resonant buzzer based on a signal is provided.

【0010】[0010]

【作用】信号合成回路によって音色信号と共振信号とが
合成され、この合成信号が入力される電圧フォロワ回路
によって共振型ブザーが駆動されることにより、従来の
ように出力用のトランジスタをスイッチング駆動する必
要がなくなる。
The signal synthesizing circuit synthesizes the timbre signal and the resonance signal, and the voltage follower circuit to which the synthesized signal is input drives the resonance type buzzer, thereby switching-driving the output transistor. There is no need.

【0011】[0011]

【実施例】以下、図面を参照してこの発明を実施例によ
り説明する。図1はこの発明に係る共振型ブザー駆動装
置の一実施例の概略的な構成を示すブロック図である。
共振型ブザー11の音色を決定する音色信号Aとこの共振
型ブザー特有の共振周波数を持つ共振信号Bとは信号合
成回路12に供給され、ここで両信号の合成信号Cが形成
される。この合成信号Cは演算増幅器を用いた電圧フォ
ロワ回路13に供給され、この電圧フォロワ回路13の出力
で上記ブザー11が共鳴駆動される。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a resonance type buzzer driving device according to the present invention.
The tone color signal A for determining the tone color of the resonance type buzzer 11 and the resonance signal B having the resonance frequency peculiar to this resonance type buzzer are supplied to the signal synthesis circuit 12, where a synthesis signal C of both signals is formed. The combined signal C is supplied to the voltage follower circuit 13 using an operational amplifier, and the output of the voltage follower circuit 13 drives the buzzer 11 in resonance.

【0012】図2は上記図1の実施例装置の詳細な構成
を示している。上記信号合成回路12は、音色信号Aがベ
ースに供給され、コレクタがアース電圧GNDの印加点
に接続されたPNPトランジスタ21と、このトランジス
タ21のエミッタと電源電圧VCCの印加点との間に接続
された電流源22と、上記共振信号Bが抵抗23を介してベ
ースに供給され、エミッタがアース電圧GNDの印加点
に接続され、かつコレクタが上記トランジスタ21のエミ
ッタに接続されたNPNトランジスタ24と、このトラン
ジスタ24のベースとGNDの印加点との間に接続された
抵抗25と、コレクタがVCCの印加点に接続され、ベー
スが上記トランジスタ21のエミッタとトランジスタ24の
コレクタとの共通接続点に接続されたNPNトランジス
タ26と、このトランジスタ26のエミッタとGNDの印加
点との間に接続された抵抗27とから構成されている。
FIG. 2 shows a detailed structure of the apparatus of the embodiment shown in FIG. The signal synthesizing circuit 12 is connected between the timbre signal A supplied to the base and the collector connected to the application point of the ground voltage GND, and the PNP transistor 21 and the emitter of the transistor 21 and the application point of the power supply voltage VCC. And an NPN transistor 24 in which the resonance signal B is supplied to the base through the resistor 23, the emitter is connected to the application point of the ground voltage GND, and the collector is connected to the emitter of the transistor 21. , A resistor 25 connected between the base of the transistor 24 and the GND application point, a collector connected to the VCC application point, and a base at a common connection point between the emitter of the transistor 21 and the collector of the transistor 24. It is composed of a connected NPN transistor 26 and a resistor 27 connected between the emitter of the transistor 26 and the application point of GND. ing.

【0013】上記電圧フォロワ回路13は正極性(+)及
び負極性(−)の入力端子と出力端子とを有する演算増
幅器(オペアンプ)28からなり、負極性(−)の入力端
子と出力端子とが接続され、正極性(+)の入力端子が
前記信号合成回路12内のトランジスタ27のエミッタに接
続されている。
The voltage follower circuit 13 comprises an operational amplifier (op amp) 28 having positive (+) and negative (-) input terminals and an output terminal, and has a negative (-) input terminal and an output terminal. And the positive (+) input terminal is connected to the emitter of the transistor 27 in the signal synthesizing circuit 12.

【0014】前記共振型ブザー11は上記演算増幅器28の
出力端子とGNDの印加点との間に接続されている。図
3は上記実施例回路における音色信号A、共振信号B及
び信号合成回路12の合成信号Cをそれぞれ示す波形図で
ある。
The resonance type buzzer 11 is connected between the output terminal of the operational amplifier 28 and the GND application point. FIG. 3 is a waveform diagram showing the tone color signal A, the resonance signal B, and the combined signal C of the signal combining circuit 12 in the circuit of the above embodiment.

【0015】信号合成回路12では音色信号Aと共振信号
Bとが合成される。この場合には音色信号Aと共振信号
Bの反転信号の積の信号がこの信号合成回路12で形成さ
れる。例えば、共振信号Bが“1”レベルのときはトラ
ンジスタ24がオンする。このとき、そのベース電位がG
NDレベルに低下するためにトランジスタ26がオフし、
合成信号Cは抵抗27によってGND電位に設定される。
The signal synthesis circuit 12 synthesizes the tone color signal A and the resonance signal B. In this case, the signal synthesizing circuit 12 forms a signal which is the product of the inversion signal of the tone color signal A and the resonance signal B. For example, when the resonance signal B is at "1" level, the transistor 24 is turned on. At this time, the base potential is G
The transistor 26 is turned off due to the decrease to the ND level,
The combined signal C is set to the GND potential by the resistor 27.

【0016】他方、共振信号Bが“0”レベルのときは
音色信号Aと相補な信号がトランジスタ26のベースに供
給され、さらのこの信号がトランジスタ26で反転される
ことにより、合成信号Cは音色信号Aに比例した電位レ
ベルに設定される。この結果、信号合成回路12の信号C
は音色信号Aと共振信号Bの反転信号の積の信号とな
る。この信号Cは電圧フォロワ回路13に供給され、その
出力電位でブザー11が駆動される。
On the other hand, when the resonance signal B is at "0" level, a signal complementary to the tone color signal A is supplied to the base of the transistor 26, and this signal is inverted by the transistor 26, whereby the composite signal C is obtained. The potential level is set in proportion to the tone color signal A. As a result, the signal C of the signal synthesis circuit 12
Is a product of the inversion signal of the tone color signal A and the resonance signal B. This signal C is supplied to the voltage follower circuit 13, and the buzzer 11 is driven by its output potential.

【0017】上記実施例装置では、ブザー11は、信号C
に追随して変化する電圧フォロワ回路13の出力信号によ
って駆動されている。共振信号Bが“1”レベルのと
き、電圧フォロワ回路13の出力は従来のように高インピ
ーダンス状態とはならず、必ずGND電位に設定される
ため、ブザー11には従来のような逆起電圧は発生しなく
なる。
In the apparatus of the above embodiment, the buzzer 11 outputs the signal C
It is driven by the output signal of the voltage follower circuit 13 which changes following the above. When the resonance signal B is at "1" level, the output of the voltage follower circuit 13 does not enter the high impedance state as in the conventional case and is always set to the GND potential. Will not occur.

【0018】このため、従来のような電圧クランプ用の
ダイオードは不要であり、演算増幅器28における従来の
ような寄生対策も全く不要である。さらに、逆起電圧対
策用のチップ上のパターン・レイアウトにも工夫を図る
必要がなくなり、容易に設計が可能になる。
Therefore, the conventional diode for voltage clamping is unnecessary, and the conventional parasitic measure in the operational amplifier 28 is completely unnecessary. Further, it is not necessary to devise a pattern layout on the chip for the counter electromotive voltage countermeasure, and the design can be easily performed.

【0019】なお、この発明は上記実施例に限定される
ものではなく種々の変形が可能であることはいうまでも
ない。例えば上記実施例では信号合成回路12として図2
に示すように構成する場合について説明したが、これは
要するに音色信号Aと共振信号Bの反転信号の積の信号
が形成されるものであるならばどのような構成であって
もよい。
It is needless to say that the present invention is not limited to the above embodiment and various modifications can be made. For example, in the above embodiment, the signal synthesizing circuit 12 shown in FIG.
However, any configuration may be used as long as it forms a product of the inversion signal of the tone signal A and the resonance signal B.

【0020】[0020]

【発明の効果】以上説明したようにこの発明によれば、
集積回路化に適した共振型ブザー駆動装置を提供するこ
とができる。
As described above, according to the present invention,
It is possible to provide a resonance type buzzer driving device suitable for integration into an integrated circuit.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の一実施例装置の概略的な構成を示す
ブロック図。
FIG. 1 is a block diagram showing a schematic configuration of a device according to an embodiment of the present invention.

【図2】図1の実施例装置の詳細な構成を示す回路図。FIG. 2 is a circuit diagram showing a detailed configuration of the device of the embodiment shown in FIG.

【図3】上記実施例装置における各種信号の波形図。FIG. 3 is a waveform chart of various signals in the apparatus of the above embodiment.

【図4】従来装置の回路図。FIG. 4 is a circuit diagram of a conventional device.

【図5】上記従来装置における各種信号の波形図。FIG. 5 is a waveform chart of various signals in the conventional device.

【符号の説明】[Explanation of symbols]

11…共振型ブザー、12…信号合成回路、13…電圧フォロ
ワ回路、21…PNPトランジスタ、22…電流源、23,2
5,27…抵抗、24,26…NPNトランジスタ、28…演算
増幅器(オペアンプ)。
11 ... Resonance type buzzer, 12 ... Signal combining circuit, 13 ... Voltage follower circuit, 21 ... PNP transistor, 22 ... Current source, 23, 2
5, 27 ... Resistor, 24, 26 ... NPN transistor, 28 ... Operational amplifier (operational amplifier).

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 共振型ブザーの音色を決定する音色信号
と所定周波数の共振信号とを合成する信号合成回路と、 上記信号合成回路の出力信号に基づいて上記共振型ブザ
ーを駆動する電圧フォロワ回路とを具備したことを特徴
とする共振型ブザー駆動装置。
1. A signal synthesizing circuit for synthesizing a tone color signal for determining a tone color of a resonance type buzzer and a resonance signal of a predetermined frequency, and a voltage follower circuit for driving the resonance type buzzer based on an output signal of the signal synthesizing circuit. And a resonance type buzzer driving device.
【請求項2】 前記電圧フォロワ回路が演算増幅器を用
いて構成されている請求項1に記載の共振型ブザー駆動
装置。
2. The resonance type buzzer driving device according to claim 1, wherein the voltage follower circuit is configured by using an operational amplifier.
JP12657993A 1993-05-28 1993-05-28 Resonant buzzer drive Expired - Fee Related JP3243060B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12657993A JP3243060B2 (en) 1993-05-28 1993-05-28 Resonant buzzer drive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12657993A JP3243060B2 (en) 1993-05-28 1993-05-28 Resonant buzzer drive

Publications (2)

Publication Number Publication Date
JPH06337680A true JPH06337680A (en) 1994-12-06
JP3243060B2 JP3243060B2 (en) 2002-01-07

Family

ID=14938668

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12657993A Expired - Fee Related JP3243060B2 (en) 1993-05-28 1993-05-28 Resonant buzzer drive

Country Status (1)

Country Link
JP (1) JP3243060B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107680573A (en) * 2017-10-30 2018-02-09 联合汽车电子有限公司 Buzzer drive circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107680573A (en) * 2017-10-30 2018-02-09 联合汽车电子有限公司 Buzzer drive circuit
CN107680573B (en) * 2017-10-30 2024-04-16 联合汽车电子有限公司 Buzzer driving circuit

Also Published As

Publication number Publication date
JP3243060B2 (en) 2002-01-07

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