JP2003037452A5 - - Google Patents
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- JP2003037452A5 JP2003037452A5 JP2001226352A JP2001226352A JP2003037452A5 JP 2003037452 A5 JP2003037452 A5 JP 2003037452A5 JP 2001226352 A JP2001226352 A JP 2001226352A JP 2001226352 A JP2001226352 A JP 2001226352A JP 2003037452 A5 JP2003037452 A5 JP 2003037452A5
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- circuit
- input signal
- power supply
- compression
- 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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Description
【００１１】
入力信号を増幅して負荷に供給する増幅器を保護する増幅器の保護回路において、増幅器の入力信号のピークレベルを圧縮する圧縮手段および入力信号の信号レベルを減衰する減衰手段を備えた入力回路と、増幅器に電力を供給するスイッチング電源回路と、該スイッチング電源回路の出力電流を検出する電流検出回路と、前記電流検出回路が過電流を検出したとき、検出した電流に応じて、前記圧縮手段による入力信号のピークレベルの圧縮、前記減衰手段による入力信号の信号レベルの減衰を行う制御回路とを備える。また、さらに、前記制御回路は、前記電源回路の出力側の開放、および前記電源回路の入力側の開放を行う。 [0011]
In a protection circuit of an amplifier for amplifying an input signal to protect an amplifier to be supplied to a load, an input circuit comprising compression means for compressing the peak level of the input signal of the amplifier and attenuation means for attenuating the signal level of the input signal; a switching power supply circuit for supplying to the amplifier unit power, a current detection circuit for detecting an output current of the switching power supply circuit, when the pre-SL current detection circuit detects an overcurrent, depending on the detected current, the compression A control circuit for compressing the peak level of the input signal by the means , and attenuating the signal level of the input signal by the attenuation means . Still further, the control circuit may open the output side of the power supply circuit, and intends row open on the input side of the power supply circuit.
【００１２】
【発明の実施の形態】
以下、本発明の実施形態を添付図面を参照しながら説明する。図１は、本発明の実施形態にかかる増幅器の保護回路を示す図である。図において、１は入力デジタルオーディオ信号をＰＷＭ変調するＤＳＰ（Digital signal processor）、２はオーディオアンプ等の増幅器、３は出力フィルタ、４はスピーカ等の負荷である。５は増幅器の保護回路全体を制御する制御回路であり、マイコン等で構成することができる。６は増幅器の保護回路の状態を表示する表示器、７は増幅器用の電源回路９の出力電流を検出する電流検出回路、８は前記制御回路用のスタンバイ電源、９は前記増幅器２に電力を供給する電源回路であり、スイッチング電源で構成する。１０は商用の交流電源である。Ｓ１は電源スイッチ、Ｓ２，Ｓ３，Ｓ４は制御回路５がオンオフ制御するリレースイッチである。[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. FIG. 1 is a diagram showing a protection circuit of an amplifier according to an embodiment of the present invention. In the figure, 1 is a DSP (Digital Signal Processor) that performs PWM modulation of an input digital audio signal, 2 is an amplifier such as an audio amplifier, 3 is an output filter, and 4 is a load such as a speaker. Reference numeral 5 denotes a control circuit that controls the entire protection circuit of the amplifier, and can be configured by a microcomputer or the like. 6 is a display unit for displaying the state of the protection circuit of the amplifier, 7 a current detection circuit for detecting an output current of the power supply circuit 9 of the amplifier, 8 standby power for the control circuit, the amplifier 2 second electrodeposition force 9 Is a power supply circuit that supplies a switching power supply. 10 is a commercial AC power supply. S1 is a power switch, and S2, S3 and S4 are relay switches that the control circuit 5 performs on / off control.
【００１９】
そこで、本実施形態では電源回路９の出力線（あるいは電源回路内部のトランスの２次巻線等でもよい）に電流検出回路７を設け、この情報を制御回路５に取り込みＤＳＰ１で入力信号のピークレベルを圧縮するピーク圧縮を行う（ＤＳＰを用いたデジタル式圧縮回路）。また、電流検出回路７の情報を再度取り込みさらに圧縮を要するか否かを判断する。このピーク圧縮により、特にクラシック音楽のようにダイナミックレンジの広い音楽では聴感上の音量レベルを下げることなく電流の頭打ちによる歪みまたは保護回路の動作による音切れを防止できる。前記ピーク圧縮を数段階にわけて行った後、未だ過電流が検出される場合には、ＤＳＰ１で入力信号の信号レベルを減衰させるレベル調整を行う。[0019]
Therefore, in the present embodiment, the current detection circuit 7 is provided on the output line of the power supply circuit 9 (or may be a secondary winding of a transformer in the power supply circuit), and this information is taken into the control circuit 5 and the peak of the input signal is received by the DSP 1. Perform peak compression to compress the level (digital compression circuit using DSP). Further, it is determined whether required again captures further compress the information of the current detection circuit 7. By this peak compression, it is possible to prevent the distortion due to the current ceiling or the cut-off due to the operation of the protection circuit without lowering the aural volume level especially in the music with a wide dynamic range like classical music. After the peak compression is divided into several steps, if an overcurrent is still detected, the DSP 1 performs level adjustment to attenuate the signal level of the input signal.
【符号の説明】
１ ＤＳＰ
２ 増幅器
３ 出力フィルタ
４ 負荷（スピーカ）
５ 制御回路
６ 表示器
７ 電流検出回路
８ スタンバイ電源
９ 電源回路
１０ 交流電源
Ｓ１ 電源スイッチ
Ｓ２，Ｓ３，Ｓ４ リレースイッチ[Description of the code]
1 DSP
2 amplifier 3 output filter 4 load (speaker)
5 Control Circuit 6 Display 7 Current Detection Circuit 8 Standby Power Supply 9 Power Supply Circuit 10 AC Power Supply S1 Power Supply Switch S2, S3, S4 Relay Switch
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001226352A JP3774385B2 (en) | 2001-07-26 | 2001-07-26 | Amplifier protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001226352A JP3774385B2 (en) | 2001-07-26 | 2001-07-26 | Amplifier protection circuit |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2003037452A JP2003037452A (en) | 2003-02-07 |
| JP2003037452A5 true JP2003037452A5 (en) | 2005-03-17 |
| JP3774385B2 JP3774385B2 (en) | 2006-05-10 |
Family
ID=19059186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001226352A Expired - Lifetime JP3774385B2 (en) | 2001-07-26 | 2001-07-26 | Amplifier protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3774385B2 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4620043B2 (en) * | 2003-03-21 | 2011-01-26 | ディー２オーディオ コーポレイション | Acoustic amplifier circuit protection system and method |
| US7706545B2 (en) | 2003-03-21 | 2010-04-27 | D2Audio Corporation | Systems and methods for protection of audio amplifier circuits |
| US7929718B1 (en) | 2003-05-12 | 2011-04-19 | D2Audio Corporation | Systems and methods for switching and mixing signals in a multi-channel amplifier |
| JP2008072157A (en) * | 2005-02-28 | 2008-03-27 | Pioneer Electronic Corp | Power amplifying apparatus |
| US7286010B2 (en) * | 2006-01-26 | 2007-10-23 | D2Audio Corporation | Systems and methods for over-current protection |
| JP2008244554A (en) * | 2007-03-26 | 2008-10-09 | Toa Corp | Overcurrent protection circuit of audio system |
| US8081028B2 (en) | 2007-12-31 | 2011-12-20 | Intersil Americas Inc. | Systems and methods for improved over-current clipping |
| JP5430438B2 (en) * | 2010-02-18 | 2014-02-26 | パナソニック株式会社 | Digital amplifier |
| GB2498649B (en) * | 2011-08-03 | 2014-03-26 | Blackstar Amplification Ltd | Solid state audio power amplifier |
| JP6085541B2 (en) * | 2013-09-13 | 2017-02-22 | エムケー電子株式会社 | Ear speaker device |
| JP6433067B2 (en) * | 2015-04-30 | 2018-12-05 | アルパイン株式会社 | Audio amplifier |
| CN106089669B (en) * | 2016-06-06 | 2017-11-21 | 珠海格力电器股份有限公司 | Compressor protective circuit, method and device |
| JP6481669B2 (en) | 2016-08-25 | 2019-03-13 | オンキヨー株式会社 | Amplifier |
-
2001
- 2001-07-26 JP JP2001226352A patent/JP3774385B2/en not_active Expired - Lifetime
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