増幅回路

Abstract

PURPOSE: To reduce the power consumption and to improve the efficiency of an amplifier circuit by providing the 1st and 2nd power circuits which supply the positive and negative voltage to an amplifier part and adding a bypass circuit, a boosting circuit and a selection switch circuit to every power circuit. CONSTITUTION: A comparator 13 always detects the amplification signal ZS and the positive power voltage face. When the potential difference (+Vcc-ZS) is less than 5V, a boosting chopper 12 is actuated. Then the operation of the chopper 12 is stopped when the potential difference is larger than 5V. As a result, the value of the signal ZS is increased and the preceding potential difference is reduced. If a state where the voltage face is larger than the signal ZS is left as it is, the signal ZS tries to exceed the voltage face to clip the output. In such a case, the chopper 12 is actuated by the comparator 13 and boosted up to +31V, i.e., the voltage face of a high efficiency amplifier 17. Thus the clipping distortions can be prevented.
(57)【要約】 【目的】 車載用のオーディオアンプなどに用いられる 増幅回路の効率の改善に関する。 【構成】 増幅部17にそれぞれ正負の電源を供給する第 1,第2の電源回路18,19は、正/負の定電圧±Vbを増 幅部17に電源電圧として供給するバイパス回路12,15 と、正/負の定電圧±Vbを昇圧させる昇圧回路11,14 と、増幅信号ZSと正/負の定電圧±Vbとを常時検出し、 増幅信号ZSが正/負の定電圧±Vbに比して大きいときに のみ、昇圧回路11,14を動作させて昇圧された電圧を増 幅部17に電源電圧として供給させる選択切替回路13,16 を備え、増幅部17は、入力信号ASを増幅して増幅信号ZS を生成する信号増幅部1と、正/負の定電圧±Vbを用い て増幅信号ZSに追従して変動する電圧を生成し、信号増 幅部1の電源電圧とする補助電源部2を備えたこと。

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Cited By (3)

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    FR-2847741-A1May 28, 2004Bosch Gmbh RobertProcede de reglage de la tension d'alimentation d'un etage amplificateur et etage amplificateur pour la mise en oeuvre du procede
    JP-2007228570-ASeptember 06, 2007Marvell World Trade Ltd, マーベル ワールド トレード リミテッドVariable power adaptive transmitter
    JP-2009097920-AMay 07, 2009Nippon Eng Kk, 日本エンジニアリング株式会社Tester device