WO2021153340A1 - D級アンプモジュール、オーディオシステム、自動車 - Google Patents
D級アンプモジュール、オーディオシステム、自動車 Download PDFInfo
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- WO2021153340A1 WO2021153340A1 PCT/JP2021/001638 JP2021001638W WO2021153340A1 WO 2021153340 A1 WO2021153340 A1 WO 2021153340A1 JP 2021001638 W JP2021001638 W JP 2021001638W WO 2021153340 A1 WO2021153340 A1 WO 2021153340A1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
- H03F3/2178—Class D power amplifiers; Switching amplifiers using more than one switch or switching amplifier in parallel or in series
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
- H03F3/2171—Class D power amplifiers; Switching amplifiers with field-effect devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
- H03F1/083—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements in transistor amplifiers
- H03F1/086—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements in transistor amplifiers with FET's
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
- H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
- H03F3/187—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only in integrated circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
- H03F3/2173—Class D power amplifiers; Switching amplifiers of the bridge type
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/03—Indexing scheme relating to amplifiers the amplifier being designed for audio applications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/297—Indexing scheme relating to amplifiers the loading circuit of an amplifying stage comprising a capacitor
Definitions
- This disclosure relates to an audio system.
- FIG. 1 is a circuit diagram of an audio system 100r.
- the audio system 100r includes an audio amplifier IC (Integrated Circuit) 200r and a filter 104 P / N in addition to the electroacoustic conversion element 102.
- the electroacoustic conversion element 102 is BTL (Bridged Transless / Bridge-Tied Load) connected to the audio amplifier IC 200r.
- the audio amplifier IC200r includes an OUTP terminal and an OUTN terminal.
- a filter 104 P is provided between the positive electrode terminal + and the OUTP terminal of the electroacoustic conversion element 102, and a filter 104 N is provided between the negative electrode terminal-and the OUTN terminal of the electroacoustic conversion element 102.
- the filter 104 is a primary filter having a series inductor L1 and a shunt capacitor C1.
- the audio amplifier IC200r includes a class D amplifier 202 P / N and a pulse modulator 206.
- the pulse modulator 206 receives an analog or digital audio signal S1 and pulse-modulates it to generate a pulse signal S2 P / N.
- Class D amplifiers 202 P and 202 N include a driver 203 and an output stage 204, respectively.
- the driver 203 drives the output stage 204 in response to the pulse signals S2 P and S2 N.
- the audio system 100r shown in FIG. 1 is composed of 4 channels, and the audio amplifier IC200 has circuits for 4 channels integrated.
- the switching line 108 is composed of wiring and cables on the printed circuit board, and the length thereof becomes long. Since the long switching line 108 has an unintended parasitic inductance component, it can be a factor of deteriorating the sound quality.
- a class D amplifier 202 for four channels is integrated in the audio amplifier IC 200.
- the class D amplifier 202 serves as a heat source during operation, but when a plurality of class D amplifiers 202 are integrated on the same semiconductor chip, heat generation of the audio amplifier IC200r becomes a problem. Therefore, heat dissipation measures such as connecting a huge heat sink to the audio amplifier IC200r are required, which causes an increase in cost.
- the present disclosure has been made in view of the above-mentioned problems, and one of the exemplary purposes of the embodiment is to provide an audio amplifier module capable of solving at least one of the above-mentioned problems.
- Class D amplifiers have n (n ⁇ 1) output stages, each containing a high-side transistor and a low-side transistor, and n high-side transistors, each of which drives one corresponding high-side transistor with n output stages.
- a semiconductor chip including a driver, n low-side transistors each driving one corresponding low-side transistor in n output stages, and n switching terminals connected to the outputs of n output stages.
- Each of which includes n inductors, one end of which is connected to one corresponding switching terminal of n output stages, is housed in one package, and operates in response to a control signal from an external processor.
- 3A and 3B are diagrams showing simulation results of heat generation of the audio system of FIG. 1 and the audio system of FIG. 4 (a) and 4 (b) are diagrams illustrating one of the advantages of the class D amplifier module of FIG. It is a perspective view which shows the structural example of the class D amplifier module.
- the class D amplifier module includes a semiconductor chip and n inductors, is housed in one package, and operates in response to a control signal from an external processor.
- a semiconductor chip is an n high-side drivers that drive n (n ⁇ 1) output stages, each containing a high-side transistor and a low-side transistor, and one corresponding high-side transistor, each of which has n output stages.
- n low-side drivers each driving one corresponding low-side transistor in n output stages, and n switching terminals connected to the outputs of n output stages.
- One end of each of the n inductors is connected to one corresponding switching terminal of the n output stages.
- the switching line connecting the output stage and the inductor exists in the package of the class D amplifier module and its length is shortened, the influence of the parasitic inductance can be suppressed and the sound quality can be improved.
- the switching line exists in the package and its length is shortened, the emission of EMI noise from the switching line can be suppressed.
- the output stages of the class D amplifier which is a heating element
- heat dissipation measures can be facilitated and the cost can be reduced.
- class D amplifier modules By increasing or decreasing the number of class D amplifier modules, it is possible to design systems with different numbers of channels.
- the class D amplifier module may further include n capacitors, each of which is provided between the other end of the corresponding n inductors and ground.
- the high-side transistor may be an NMOS transistor.
- a semiconductor chip receives a constant voltage at a voltage source that generates a constant voltage, n bootstrap terminals, and each anode, and each cathode is connected to the corresponding one of n bootstrap terminals.
- the rectifying element of the above may be further included.
- Class D amplifier modules have n bootstrap capacitors, one end of which is connected to the corresponding one of n bootstrap terminals and the other end of which is connected to the corresponding one of n switching terminals. You may also prepare for it.
- N 2
- the two output stages may be BTL-connected.
- the "state in which the member A is connected to the member B” means that the member A and the member B are physically directly connected, and that the member A and the member B are electrically connected to each other. It also includes the case of being indirectly connected via other members, which does not substantially affect the connection state, or does not impair the functions and effects performed by the combination thereof.
- a state in which the member C is provided between the member A and the member B means that the member A and the member C, or the member B and the member C are directly connected, and their electricity. It also includes the case of being indirectly connected via other members, which does not substantially affect the connection state, or does not impair the functions and effects produced by the combination thereof.
- FIG. 2 is a block diagram of an audio system 100 including a class D amplifier module 300 according to the embodiment.
- the audio system 100 is composed of m channels (m ⁇ 1), and includes m electroacoustic conversion elements 102_1 to 102_m, m class D amplifier modules 300_1 to 300_m, and a processor 400.
- m 4.
- the processor 400 generates control pulses S1P / S1P to SmP / SmN for m class D amplifier modules 300_1 to 300_m.
- the semiconductor chip 310 includes n output stages 312_1 to 312_n, n high-side drivers 314_1 to 314_n, n low-side drivers 316_1 to 316_n, and n switching terminals SW1 to SWn, and is integrated on one semiconductor substrate. It has been transformed.
- the electroacoustic conversion element 102_i is BTL-connected to the output stages 312_1 and 312_2 of the corresponding class D amplifier module 300_i.
- the high-side driver 314_j drives the corresponding high-side transistor MH of the n output stages 312.
- the low-side driver 316_j drives the corresponding low-side transistor ML of the n output stages 312.
- One end of the inductor Lj is connected to the switching terminal SWj of one corresponding 312_j of the n output stages 312. Further, the capacitor Cj is provided between the other end of the corresponding inductor Lj and the ground, and constitutes a low-pass filter together with the inductor Lj.
- the above is the configuration of the class D amplifier module 300. According to the class D amplifier module 300, at least one of the advantages 1 to 4 can be supplied.
- the switching line 304 connecting the switching terminal SWj of the output stage 312 and the inductor L1 exists in the package of the class D amplifier module 300, and the length thereof is shortened. As a result, the influence of the parasitic inductance of the switching line 304 can be suppressed and the sound quality can be improved.
- the switching line 304 exists in the package and its length is shortened, the emission of EMI noise from the switching line 304 can be suppressed.
- the output stages 312 of the class D amplifier which is a heating element, can be distributed and arranged for each class D amplifier module 300. That is, since the heat sources can be dispersed and arranged, heat dissipation measures can be facilitated and the cost can be reduced.
- 3 (a) and 3 (b) are diagrams showing simulation results of heat generation of the audio system 100r of FIG. 1 and the audio system 100 of FIG. Each has a 4-channel configuration, and the class D amplifier of each channel is modeled as a 25 W heating element.
- the audio system 100 of FIG. 2 will be described with reference to FIG. 3 (b).
- a plurality of class D amplifier modules 300_1 to 300_m are dispersedly arranged in the region where the LC filter existed in FIG. 3A.
- the temperature rise of each class D amplifier module 300 is suppressed to about 120 ° C. Therefore, the heat dissipation measures can be significantly simplified as compared with the conventional case, and the cost can be reduced.
- FIG. 4A shows a 4-channel audio system 100
- FIG. 4B shows a 2-channel audio system 100.
- the number m of the class D amplifier modules 300 can be increased or decreased according to the number of channels m, and it is possible to easily support systems having different numbers of channels m.
- FIG. 5 is a perspective view showing a configuration example of the class D amplifier module 300.
- the inductors L1 and L2 are configured as a single chip component.
- the layout of the semiconductor chip 310 and the chip components C1, C2, L1 and L2 on the support substrate 302 is not particularly limited.
- the semiconductor chip 310 and a plurality of chip components are mounted on the same surface of the support substrate 302, but the present invention is not limited to this, and the semiconductor chip 310 may be mounted three-dimensionally.
- a member other than the support substrate 302, for example, a lead frame or the like may be used as a base material to form the package.
- FIG. 6 is a circuit diagram of the class D amplifier module 300A according to the first modification.
- the high-side transistor MH is an N-channel FET.
- N 2
- the class D amplifier module 300A includes semiconductor chips 310A, inductors L1 and L2, capacitors C1 and C2, and n bootstrap capacitors C B 1 and C B 2.
- the boot strap capacitor C B j is connected between the corresponding boot strap terminal BSP j and the corresponding switching terminal SW j.
- the semiconductor chip 310A includes n output stages 312, n high-side drivers 314, n low-side drivers 316, n rectifying elements 322, and a constant voltage source 320.
- the constant voltage source 320 produces a constant voltage VREG .
- the class D amplifier module 300A may include a capacitor C REG for smoothing a constant voltage V REG .
- the anode of the rectifying element 322_j is supplied a constant voltage V REG, the cathode is connected to the corresponding bootstrap terminal BSPj.
- Rectifying element 322_j bootstrap capacitor C B j constitutes a bootstrap circuit, for generating a supply voltage for the high side driver 314_J.
- Protection / control circuit 330 is a block for integrally controlling the class D amplifier module 300A, a communication interface with an external microcomputer (e.g. I 2 C), comprising a protective circuit of the semiconductor chip 310A.
- an external microcomputer e.g. I 2 C
- the protection / control circuit 330 detects an abnormality, it notifies an external microcomputer or the like via the ERROR pin.
- the protection / control circuit 330 is connected to an external microcomputer via the clock pin SCL and the data pin SDA, and receives a control signal from the external microcomputer.
- the protection / control circuit 330 controls the start and stop of the class D amplifier module 300A according to the power-down signal (inversion logic) input to the PDX pin. Further, the protection / control circuit 330 switches between the mute state and the non-mute state according to the mute signal (inversion logic) input to the MUTEX pin.
- FIG. 7 is a block diagram of the audio system 100B according to the third modification.
- one electroacoustic conversion element 102 is single-ended connected to one output stage 312.
- a capacitor Co for decoupling is externally attached between the output pin of the class D amplifier module 300 and the electroacoustic conversion element 102.
- the capacitor Co may be built in the class D amplifier module 300.
- the n capacitors C1 to Cn may be externally attached to the class D amplifier module 300.
- FIG. 8 is a block diagram of an automobile (vehicle-mounted audio device) 500 equipped with an audio system 100.
- the in-vehicle audio device 500 is composed of four channels (front right FR, rear right RR, front left FL, rear left RL), and includes a plurality of speakers 502FR, 502RR, 502FL, and 502RL corresponding to the four channels.
- the in-vehicle audio device 500 may have 5.1 channels further including a center channel and a subwoofer channel, or may have more channels.
- the sound source 504 is a CD player, a DVD player, a Blu-ray player, an HDD / silicon audio player, a radio tuner, or the like, and reproduces an analog or digital audio signal.
- the DSP 200 receives an audio signal from the sound source 504 and performs various digital signal processing.
- the audio signal processed by the DSP 200 is input to the amplifier block 506.
- the amplifier block 506 corresponds to the audio system 100 described above, and includes a processor 400 and a plurality of class D amplifier modules 300.
- the amplifier block 506 amplifies the analog audio signal of each channel and drives the corresponding speaker 502.
- the microcomputer 508 integrally controls blocks such as the DSP 200.
- the sound source 504, the microcomputer 508, the DSP 200, and the amplifier block 506 operate by receiving power supplied from the battery 520.
- the sound source 504, the microcomputer 508, the DSP 200, and the amplifier block 506 may be built in the head unit 510.
- This disclosure relates to an audio system.
- Electroacoustic conversion element 300 Class D amplifier module L1 inductor C1 capacitor 302 Support board 310 Semiconductor chip 312 Output stage MH High side transistor ML Low side transistor 314 High side driver 316 Low side driver 320 Constant voltage source 322 Rectifier element 330 Protection / Control circuit 400 processor
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Abstract
Description
オーディオシステム100rでは、オーディオアンプIC200の出力ピンOUTP/OUTNとフィルタ104P/104Nの間は、スイッチングライン108を介して接続されている。出力ピンOUTP/OUTNに発生する大信号の出力信号Vo+,Vo-は、スイッチングライン108を経由して伝送され、またスイッチングライン108には大電流が流れる。
大信号のスイッチング波形が、長いスイッチングライン108を伝搬すると、EMI(Electromagnetic Interference)ノイズとして輻射され易いという問題がある。
図1のオーディオシステム100rでは、オーディオアンプIC200に4チャンネル分のD級アンプ202が集積化される。D級アンプ202は動作中に熱源となるところ、複数のD級アンプ202を同じ半導体チップ上に集積化すると、オーディオアンプIC200rの発熱が問題となる。このため、オーディオアンプIC200rに巨大なヒートシンクを接続するなどの放熱対策が必要となり、コストアップの要因となる。
図1のオーディオシステム100rでは、4チャンネルのうち、2チャンネルしか使用しない場合に、2チャンネル分のD級アンプ202が無駄となる。
本明細書に開示される一実施の形態は、D級アンプモジュールに関する。D級アンプモジュールは、半導体チップと、n個のインダクタを備え、ひとつのパッケージに収容され、外部のプロセッサからの制御信号に応じて動作する。半導体チップは、それぞれがハイサイドトランジスタおよびローサイドトランジスタを含むn個(n≧1)の出力段と、それぞれがn個の出力段の対応するひとつのハイサイドトランジスタを駆動するn個のハイサイドドライバと、それぞれがn個の出力段の対応するひとつのローサイドトランジスタを駆動するn個のローサイドドライバと、n個の出力段の出力と接続されるn個のスイッチング端子と、を含む。n個のインダクタは、それぞれの一端がn個の出力段の対応するひとつのスイッチング端子と接続される。
以下、実施の形態について図面を参照しながら説明する。各図面に示される同一または同等の構成要素、部材、処理には、同一の符号を付するものとし、適宜重複した説明は省略する。また、実施の形態は、開示を限定するものではなく例示であって、実施の形態に記述されるすべての特徴やその組み合わせは、必ずしも開示の本質的なものであるとは限らない。
図2のD級アンプモジュール300によれば、出力段312のスイッチング端子SWjとインダクタL1を接続するスイッチングライン304は、D級アンプモジュール300のパッケージ内に存在し、その長さが短くなる。これにより、スイッチングライン304の寄生インダクタンスの影響を抑制し、音質を改善できる。
また、スイッチングライン304がパッケージ内に存在し、その長さが短くなるため、スイッチングライン304からのEMIノイズの放射を抑制できる。図2の構成では、プロセッサ400からi番目(i=1,…m)のD級アンプモジュール300_iに対して、プリント基板上の配線を介してパルス信号SiP/SiNが供給されるが、パルス信号SiP/SiNは小信号であるため、EMIノイズの問題は生じにくい。
図2のオーディオシステム100において、発熱体であるD級アンプの出力段312を、D級アンプモジュール300ごとに分散して配置できる。すなわち熱源を分散して配置できるため、放熱対策が容易となり、コストを下げることができる。
図4(a)、(b)は、図2のD級アンプモジュール300の利点のひとつを説明する図である。図4(a)は、4チャンネルのオーディオシステム100を、図4(b)は、2チャンネルのオーディオシステム100を示す。このようにチャンネル数mに応じて、D級アンプモジュール300の個数mを増減することができ、チャンネル数mが異なるシステムに容易に対応できる。
図6は、変形例1に係るD級アンプモジュール300Aの回路図である。この変形例において、ハイサイドトランジスタMHはNチャンネルFETである。この例ではN=2であり、D級アンプモジュール300Aは、半導体チップ310A、インダクタL1,L2、キャパシタC1,C2およびn個のブートストラップキャパシタCB1,CB2を備える。ブートストラプキャパシタCBjは、対応するブートストラップ端子BSPjと対応するスイッチング端子SWjの間に接続される。
実施の形態では、n=2個の出力段312に対して、電気音響変換素子102がBTL接続される場合を説明したがその限りでない。図7は、変形例3に係るオーディオシステム100Bのブロック図である。この変形例3において、1個の出力段312に対して、1個の電気音響変換素子102がシングルエンド接続される。D級アンプモジュール300の出力ピンと電気音響変換素子102の間には、デカップリング用のキャパシタCoが外付けされる。なお、D級アンプモジュール300を、シングルエンド専用とする場合、キャパシタCoを、D級アンプモジュール300に内蔵してもよい。
変形例4において、n個のキャパシタC1~Cnは、D級アンプモジュール300に外付けするようにしてもよい。
実施の形態では、ひとつのD級アンプモジュール300にn=2の出力段312を内蔵したが、その限りでなく、n=1であってもよいし、n≧3であってもよい。
102 電気音響変換素子
300 D級アンプモジュール
L1 インダクタ
C1 キャパシタ
302 支持基板
310 半導体チップ
312 出力段
MH ハイサイドトランジスタ
ML ローサイドトランジスタ
314 ハイサイドドライバ
316 ローサイドドライバ
320 定電圧源
322 整流素子
330 保護/制御回路
400 プロセッサ
Claims (6)
- それぞれがハイサイドトランジスタおよびローサイドトランジスタを含むn個(n≧1)の出力段と、それぞれが前記n個の出力段の対応するひとつの前記ハイサイドトランジスタを駆動するn個のハイサイドドライバと、それぞれが前記n個の出力段の対応するひとつの前記ローサイドトランジスタを駆動するn個のローサイドドライバと、前記n個の出力段の出力と接続されるn個のスイッチング端子と、を含む半導体チップと、
それぞれの一端が前記n個の出力段の対応するひとつの前記スイッチング端子と接続されるn個のインダクタと、
を備え、ひとつのパッケージに収容され、外部のプロセッサからの制御信号に応じて動作することを特徴とするD級アンプモジュール。 - それぞれが前記n個のインダクタの対応するひとつの他端と接地の間に設けられる、n個のキャパシタをさらに備えることを特徴とする請求項1に記載のD級アンプモジュール。
- 前記ハイサイドトランジスタはNMOSトランジスタであり、
前記半導体チップは、
定電圧を生成する電圧源と、
n個のブートストラップ端子と、
それぞれのアノードに前記定電圧を受け、それぞれのカソードが前記n個のブートストラップ端子の対応するひとつと接続されるn個の整流素子と、
をさらに含み、
前記D級アンプモジュールは、それぞれの一端が前記n個のブートストラップ端子の対応するひとつと接続され、それぞれの他端が前記n個のスイッチング端子の対応するひとつと接続される、n個のブートストラップキャパシタをさらに備えることを特徴とする請求項1または2に記載のD級アンプモジュール。 - n=2であり、2個の出力段はBTL接続されることを特徴とする請求項1から3のいずれかに記載のD級アンプモジュール。
- プロセッサと、
m個(m≧1)の電気音響変換素子と、
それぞれが前記m個の電気音響変換素子の対応するひとつを駆動するm個の請求項4に記載のD級アンプモジュールと、
を備えることを特徴とするオーディオシステム。 - 請求項5に記載のオーディオステムを備えることを特徴とする自動車。
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202180007194.6A CN114830531A (zh) | 2020-01-27 | 2021-01-19 | D级放大器模块、音频系统、汽车 |
| DE112021000761.0T DE112021000761T5 (de) | 2020-01-27 | 2021-01-19 | Class-D-Verstärkermodul, Audiosystem und Automobil |
| KR1020227014450A KR20220132519A (ko) | 2020-01-27 | 2021-01-19 | D급 앰프 모듈, 오디오 시스템, 자동차 |
| JP2021574654A JP7588100B2 (ja) | 2020-01-27 | 2021-01-19 | オーディオシステム、自動車 |
| US17/874,359 US20220407477A1 (en) | 2020-01-27 | 2022-07-27 | Class d amplifier module |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-011038 | 2020-01-27 | ||
| JP2020011038 | 2020-01-27 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US17/874,359 Continuation US20220407477A1 (en) | 2020-01-27 | 2022-07-27 | Class d amplifier module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2021153340A1 true WO2021153340A1 (ja) | 2021-08-05 |
Family
ID=77078855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2021/001638 Ceased WO2021153340A1 (ja) | 2020-01-27 | 2021-01-19 | D級アンプモジュール、オーディオシステム、自動車 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20220407477A1 (ja) |
| JP (1) | JP7588100B2 (ja) |
| KR (1) | KR20220132519A (ja) |
| CN (1) | CN114830531A (ja) |
| DE (1) | DE112021000761T5 (ja) |
| WO (1) | WO2021153340A1 (ja) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10308990A (ja) * | 1997-05-09 | 1998-11-17 | Nissan Motor Co Ltd | 自動車のスピーカユニット |
| JP2005294576A (ja) * | 2004-03-31 | 2005-10-20 | Sharp Corp | デジタルアンプ基板 |
| JP2010045726A (ja) * | 2008-08-18 | 2010-02-25 | Sharp Corp | 信号増幅装置及び信号処理方法 |
| JP2012060269A (ja) * | 2010-09-06 | 2012-03-22 | Toyota Motor Corp | 増幅器及び方法 |
| JP2016208500A (ja) * | 2015-04-27 | 2016-12-08 | ローム株式会社 | オーディオアンプ回路、それを用いたオーディオ出力装置、およびそれを用いた電子機器 |
| US20190267957A1 (en) * | 2018-02-23 | 2019-08-29 | Qsc, Llc | Audio amplifier assemblies, processes, and methods |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3410061B2 (ja) | 2000-02-07 | 2003-05-26 | 株式会社 デジアン・テクノロジー | D級アンプ |
| US7378904B2 (en) * | 2003-10-15 | 2008-05-27 | Texas Instruments Incorporated | Soft transitions between muted and unmuted states in class D audio amplifiers |
| JP2006050431A (ja) | 2004-08-06 | 2006-02-16 | Taiyo Yuden Co Ltd | デジタルアンプモジュールおよび音声処理装置 |
| JP2007259262A (ja) | 2006-03-24 | 2007-10-04 | Sharp Corp | オーディオ装置 |
| JP2011172066A (ja) * | 2010-02-19 | 2011-09-01 | Renesas Electronics Corp | 演算増幅器、並びに、それを用いた表示パネルドライバ及び表示装置 |
| US9685919B2 (en) * | 2013-08-21 | 2017-06-20 | On-Bright Electronics (Shanghai) Co., Ltd. | Amplification systems and methods with output regulation |
| JP6560032B2 (ja) * | 2015-06-22 | 2019-08-14 | ローム株式会社 | 半導体集積回路、オーディオアンプ回路、電子機器 |
| US10243443B2 (en) * | 2016-03-16 | 2019-03-26 | Analog Devices, Inc. | Bias voltage generator for n-channel based linear regulator |
| JP6820171B2 (ja) * | 2016-09-15 | 2021-01-27 | ローム株式会社 | D級アンプ回路、その制御方法、オーディオ出力装置、電子機器 |
| KR102534861B1 (ko) | 2016-12-23 | 2023-05-22 | 삼성전자주식회사 | 앰프 모듈 및 그 제어 방법 |
-
2021
- 2021-01-19 KR KR1020227014450A patent/KR20220132519A/ko not_active Ceased
- 2021-01-19 WO PCT/JP2021/001638 patent/WO2021153340A1/ja not_active Ceased
- 2021-01-19 JP JP2021574654A patent/JP7588100B2/ja active Active
- 2021-01-19 CN CN202180007194.6A patent/CN114830531A/zh active Pending
- 2021-01-19 DE DE112021000761.0T patent/DE112021000761T5/de active Pending
-
2022
- 2022-07-27 US US17/874,359 patent/US20220407477A1/en not_active Abandoned
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10308990A (ja) * | 1997-05-09 | 1998-11-17 | Nissan Motor Co Ltd | 自動車のスピーカユニット |
| JP2005294576A (ja) * | 2004-03-31 | 2005-10-20 | Sharp Corp | デジタルアンプ基板 |
| JP2010045726A (ja) * | 2008-08-18 | 2010-02-25 | Sharp Corp | 信号増幅装置及び信号処理方法 |
| JP2012060269A (ja) * | 2010-09-06 | 2012-03-22 | Toyota Motor Corp | 増幅器及び方法 |
| JP2016208500A (ja) * | 2015-04-27 | 2016-12-08 | ローム株式会社 | オーディオアンプ回路、それを用いたオーディオ出力装置、およびそれを用いた電子機器 |
| US20190267957A1 (en) * | 2018-02-23 | 2019-08-29 | Qsc, Llc | Audio amplifier assemblies, processes, and methods |
Also Published As
| Publication number | Publication date |
|---|---|
| DE112021000761T5 (de) | 2022-11-24 |
| CN114830531A (zh) | 2022-07-29 |
| JPWO2021153340A1 (ja) | 2021-08-05 |
| KR20220132519A (ko) | 2022-09-30 |
| US20220407477A1 (en) | 2022-12-22 |
| JP7588100B2 (ja) | 2024-11-21 |
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