Short-circuit detecting circuit

Details Short-circuit detecting circuit Short-circuit detecting circuit

2009-07-21

2010-12-07

Nguyen, Hieu P (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S20700P, C330S20700P, C330S298000

Reexamination Certificate

active

07847632

ABSTRACT:
A short-circuit detecting circuit which can accurately detect an output short-circuit of a class-D amplifier by a simple circuit construction. Two comparison pulse signals are formed on the basis of predetermined generating threshold values and a signal level of each of two output stage input pulse signals which are formed on the basis of an input pulse signal to the class-D amplifier and are supplied to an output stage of the class-D amplifier. A signal level of an output pulse from the class-D amplifier in a period of time corresponding to a pulse width of each of the comparison pulse signals is compared with a predetermined detection threshold values. A short-circuit detection signal is outputted in accordance with obtained level comparison results.

REFERENCES:
patent: 7327187 (2008-02-01), Lee
patent: 7586369 (2009-09-01), Kobayashi et al.
patent: 2007-235526 (2007-09-01), None

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