Discharge circuit for the capacitor of an ac-input filter and method for operating it

摘要

In accordance with an embodiment, a power supply (10) may include a filter stage (32,20,34) coupled to an input terminal (80A) of a discharge circuit (80) and a supply capacitor (52) coupled to an output terminal (80B) of the discharge circuit (80). In accordance with another embodiment, a method for discharging at least one capacitor includes discharging the at least one capacitor in response to a signal at the input terminal of the discharge circuit being different from a reference signal.