Method and apparatus for protecting a switching amplifier...

Details Method and apparatus for protecting a switching amplifier... Method and apparatus for protecting a switching amplifier...

2007-01-02

2007-01-02

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S298000

Reexamination Certificate

active

11030776

ABSTRACT:
A class D switching amplifier has a pulse width modulator that drives a speaker. The amplifier includes an over-current protection circuit, which includes current-monitoring MOSFETs that are each in parallel with one of four power MOSFETs. Signals taken from one side of the current-monitoring MOSFETs go to a logic circuit that removes the amplifier input circuit when the logic circuit indicates that an over-current condition is present. Current through the current-monitoring MOSFETs also goes through the speaker, thus improving amplifier efficiency.

REFERENCES:
patent: 5008586 (1991-04-01), Miyazaki et al.
patent: 5973569 (1999-10-01), Nguyen
patent: 6603353 (2003-08-01), Ishida
patent: 6859096 (2005-02-01), Tanaka et al.
patent: 2001/0010482 (2001-08-01), Oki et al.
patent: 2004/0061552 (2004-04-01), Tanaka et al.
patent: 2004/0196072 (2004-10-01), Jiandong
patent: 1193867 (2002-04-01), None

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