Protection circuit and method for protecting switching power...

Details Protection circuit and method for protecting switching power... Protection circuit and method for protecting switching power...

2007-09-27

2009-06-30

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S20700P

Reexamination Certificate

active

07554399

ABSTRACT:
A protection circuit and method for protecting switching power amplifier circuits during reset provides protection against latch-up and other failures due to energy returned from an inductive load when the amplifier is reset. Upon receipt of a reset indication, rather than immediately disabling the switching power output stage, the switching power output stage is driven toward a fifty-percent duty cycle of operation for a time period so that energy stored in inductance of the load is reduced, preventing back-currents that would otherwise may cause latch-up of the output stage when the switching power output stage is disabled. After the time period has elapsed, the switching power output stage is disabled. Alternatively, the current through the inductive load is measured and the switching power stage is disabled after the magnitude of the current has fallen below a threshold.

REFERENCES:
patent: 4322770 (1982-03-01), Sendelweck
patent: 5126637 (1992-06-01), Watts et al.
patent: 6107844 (2000-08-01), Berg et al.
patent: 6639815 (2003-10-01), Gucyski
patent: 6737713 (2004-05-01), Georgescu et al.
patent: 2008/0043391 (2008-02-01), Wong et al.
TA5132 Datasheet, Texas Instruments, 2006.
LM 4673 Datasheet, National Semiconductor, Apr. 2006.

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