DETECTION CIRCUIT FOR AN ACTIVE DISCHARGE CIRCUIT OF AN X-CAPACITOR, RELATED ACTIVE DISCHARGE CIRCUIT, INTEGRATED CIRCUIT AND METHOD

摘要

An active discharge circuit discharges an X. The detection circuit includes a sensor circuit that generates a sensor signal indicative of an AC oscillation voltage at the X capacitor. The detection circuit also includes a processing unit that generates the reset signal as a function of a comparison signal. A comparator circuit generates the comparison signal by comparing the sensor signal with a threshold. A timer circuit sets a discharge enable signal to a first logic level when the timer circuit is reset via a reset signal. The timer circuit determines the time elapsed since the last reset and tests whether the time elapsed exceeds a given timeout value. If the time elapsed exceeds the given timeout value, the timer circuit sets the discharge enable signal to a second logic level. A dynamic threshold generator circuit varies the threshold of the comparator circuit as a function of the sensor signal.

主权项

1. A detection circuit, comprising:
a sensor circuit for connection to an X capacitor, said sensor circuit configured to generate a sensor signal indicative of a voltage at said X capacitor; a comparator circuit configured to generate a comparison signal by comparing said sensor signal with a threshold; a timer circuit configured to:
set a discharge enable signal to a first logic level in response to said timer circuit being reset via a reset signal; anddetermine a time elapsed since said timer circuit has been reset via the reset signal;test whether said time elapsed exceeds a given timeout value; andin case said time elapsed exceeds said given timeout value, set said discharge enable signal to a second logic level to cause the active discharge circuit to discharge the X capacitor; an elaboration circuit configured to generate said reset signal for said timer circuit as a function of said comparison signal; and a dynamic threshold generator circuit configured to vary said threshold of said comparator circuit as a function of said sensor signal.