Patent ID: 9692298
Date: 2017-06-27
CPC Classifications: H02M,H05B,Y02B

Claim:
1. A transient event detector to detect whether a magnitude of a slope of an input current signal exceeds a slope threshold, the transient event detector comprising: a first reference generator coupled to scale the input current signal to generate a first reference current signal that tracks the input current signal; an adjustable low-pass filter circuit coupled to receive the input current signal and to generate a filtered input current signal in response thereto, wherein the adjustable low-pass filter circuit has a cutoff frequency such that a magnitude of a slope of the filtered input current signal is less than the magnitude of the slope of the input current signal during a transient event; and a first comparator coupled to generate an event detection signal that indicates the presence of the transient event in response to a value of the filtered input current signal reaching a value of the first reference current signal, wherein the adjustable low-pass filter circuit is configured to increase the cutoff frequency in response to the event detection signal indicating the presence of the transient event to increase the magnitude of the slope of the filtered input current signal.