Dc isolated audio power amplifier

Details Dc isolated audio power amplifier Dc isolated audio power amplifier

H - Electricity

03

F

H03F 1/02 (2006.01)

Patent

CA 2326102

There is provided an audio power amplifier having an output DC isolated from ground between two capacitors which are connected in series across a bias potential. The bias potential may be generated from common AC line currents by a simple bridge rectifier without the need for a bulky power supply transformer. The amplifier is DC isolated from the input signal, and hence from ground, by a balun or other small-signal transformer. Feedback is provided to compensate for ripple appearing on the bias potential.

L'invention se rapporte à un amplificateur de puissance audio ayant une sortie en courant continu isolée de la terre entre deux condensateurs reliés en série et aux bornes desquels est appliqué un potentiel de polarisation. Ce potentiel de polarisation peut être généré à partir de courants alternatifs de ligne commune par un simple redresseur en pont sans recours à un transformateur d'alimentation volumineux. L'amplificateur est isolé en courant continu par rapport au signal d'entrée, et donc par rapport à la terre, par un transformateur symétrique-dissymétrique ou tout autre transformateur de petits signaux. Une rétroaction permet de compenser l'ondulation apparaissant sur le potentiel de polarisation.

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