Over-current protection circuit and method for protecting...

Details Over-current protection circuit and method for protecting... Over-current protection circuit and method for protecting...

2007-09-27

2009-06-30

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including protection means

C330S010000, C330S251000

Reexamination Certificate

active

07554409

ABSTRACT:
An over-current protection circuit protection circuit and method for protecting switching power amplifier circuits provides protection against latch-up and other failures due to energy returned from an inductive load when one or more transistors in the amplifier output are disabled in response to an over-current condition. Upon detection of an over-current condition, the transistor corresponding to the over-current conduction direction is disabled. At the same time, the transistor corresponding to the conduction direction opposite the over-current direction is enabled for a predetermined time period, or until the magnitude of the load current has dropped, so that energy stored in inductance of the load is reduced, preventing back-currents that would otherwise cause latch-up and consequent destruction of the output stage when the switching power output stage is disabled. After the predetermined time period has elapsed or the load current has dropped below a threshold, the entire output stage is disabled.

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), Guycyski
patent: 6737713 (2004-05-01), Georgescu et al.
patent: 7268621 (2007-09-01), Kanoh et al.
patent: 2004/0184627 (2004-09-01), Kost 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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