JP2008228157A - 電力増幅器 - Google Patents
電力増幅器 Download PDFInfo
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- JP2008228157A JP2008228157A JP2007066572A JP2007066572A JP2008228157A JP 2008228157 A JP2008228157 A JP 2008228157A JP 2007066572 A JP2007066572 A JP 2007066572A JP 2007066572 A JP2007066572 A JP 2007066572A JP 2008228157 A JP2008228157 A JP 2008228157A
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Abstract
【解決手段】 可聴周波数信号を供給された制御電圧に応じた利得で増幅して電圧制御増幅器6が出力する。その出力には直流成分が含まれている。電圧制御僧服器6の出力信号が直流阻止コンデンサ16及びプリアンプ4を介して入力側にデジタルアンプ2に供給される。デジタルアンプ2の入力側と基準電位との間に接合型FET24が接続され、デジタルアンプ2に短絡電流が流れているとき、短絡電流検出器14からの信号によって、電圧制御増幅器6の利得が最小とされ、FET24が導通する。
【選択図】 図1
Description
4 プリアンプ(前置増幅手段)
6 電圧制御増幅器(可変利得増幅手段)
14 短絡電流検出器(過電流検出手段)
24 接合型FET(半導体スイッチング素子)
Claims (3)
- 可聴周波数信号を、供給された制御信号に応じた利得で増幅して出力し、その出力には直流成分が含まれている可変利得増幅手段と、
この可変利得増幅手段の出力が、直流阻止コンデンサを介して入力側に供給され、供給された前記可変利得増幅手段の出力を電力増幅して、出力する電力増幅手段と、
この電力増幅手段の入力側及び前記直流阻止コンデンサの間と基準電位との間に接続された半導体スイッチング素子と、
前記電力増幅手段に過電流が流れているとき、過電流検出信号を生成する過電流検出手段とを、
具備し、前記可変利得増幅手段は、前記過電流検出信号が前記制御信号として供給されたとき、利得を最小とし、前記半導体スイッチング素子は、前記過電流検出信号が供給されたとき導通する
電力増幅器。 - 請求項1記載の電力増幅器において、前記直流阻止コンデンサを介して供給された前記可変利得増幅手段の出力信号を増幅して、前記電力増幅手段の入力側に供給する前置増幅手段を有し、前記半導体スイッチング手段が前記電力増幅手段の入力側と基準電位との間に接続されている電力増幅器。
- 請求項1記載の電力増幅器において、前記電力増幅手段は、フィードバック手段を備えたデジタル増幅手段である電力増幅器。
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JP2007066572A JP4772719B2 (ja) | 2007-03-15 | 2007-03-15 | 電力増幅器 |
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JP2007066572A JP4772719B2 (ja) | 2007-03-15 | 2007-03-15 | 電力増幅器 |
Publications (2)
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JP2008228157A true JP2008228157A (ja) | 2008-09-25 |
JP4772719B2 JP4772719B2 (ja) | 2011-09-14 |
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JP2007066572A Active JP4772719B2 (ja) | 2007-03-15 | 2007-03-15 | 電力増幅器 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106612479A (zh) * | 2015-10-23 | 2017-05-03 | 钰太芯微电子科技(上海)有限公司 | 一种基于扬声器的保护电路 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5595409A (en) * | 1979-01-11 | 1980-07-19 | Sony Corp | Overcurrent detector of pulse-width-modulated signal amplifier circuit |
JPS6047312U (ja) * | 1983-09-08 | 1985-04-03 | 三洋電機株式会社 | 増幅器の保護回路 |
JPH03159408A (ja) * | 1989-11-17 | 1991-07-09 | Fujitsu Ten Ltd | スイッチングアンプの保護回路 |
JPH08172693A (ja) * | 1994-12-20 | 1996-07-02 | Sony Corp | スピーカー駆動回路 |
JP2003304123A (ja) * | 2002-04-11 | 2003-10-24 | Kenwood Corp | オーディオアンプ及びその異常検出方法 |
JP2004015416A (ja) * | 2002-06-06 | 2004-01-15 | Sharp Corp | D級増幅器 |
-
2007
- 2007-03-15 JP JP2007066572A patent/JP4772719B2/ja active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5595409A (en) * | 1979-01-11 | 1980-07-19 | Sony Corp | Overcurrent detector of pulse-width-modulated signal amplifier circuit |
JPS6047312U (ja) * | 1983-09-08 | 1985-04-03 | 三洋電機株式会社 | 増幅器の保護回路 |
JPH03159408A (ja) * | 1989-11-17 | 1991-07-09 | Fujitsu Ten Ltd | スイッチングアンプの保護回路 |
JPH08172693A (ja) * | 1994-12-20 | 1996-07-02 | Sony Corp | スピーカー駆動回路 |
JP2003304123A (ja) * | 2002-04-11 | 2003-10-24 | Kenwood Corp | オーディオアンプ及びその異常検出方法 |
JP2004015416A (ja) * | 2002-06-06 | 2004-01-15 | Sharp Corp | D級増幅器 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106612479A (zh) * | 2015-10-23 | 2017-05-03 | 钰太芯微电子科技(上海)有限公司 | 一种基于扬声器的保护电路 |
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