Capacitor discharging

A device comprising:

• one or more components configured to discharge a capacitor;
• an analog-to-digital converter (ADC) configured to generate samples that represent voltage levels of a signal that corresponds to an alternating current (AC) signal across the capacitor;
• and
• one or more processors configured to:
• store, based on samples generated by the ADC, a peak voltage level, a valley voltage level, and a frequency of the signal, wherein the peak voltage level is stored in a first register and the valley voltage level is stored in a second register;
• periodically determine, based on samples generated at a frequency determined based on the stored frequency of the signal, whether a current peak voltage level of the signal is different than the stored peak voltage level of the signal and whether a current valley voltage level of the signal is different than the stored valley voltage level of the signal;
• determine, based on whether the current peak voltage level of the signal is different than the stored peak voltage level or the current valley voltage level of the signal is different than the stored valley voltage level, whether the AC signal has been removed from the capacitor;
• and
• in response to determining that the AC signal has been removed from the capacitor, cause the one or more components to discharge the capacitor.

A device comprising:

• means for storing a peak voltage level, a valley voltage level, and a frequency of a signal that corresponds to an alternating current (AC) signal across a capacitor, wherein the peak voltage level is stored in a first register and the valley voltage level is stored in a second register;
• means for periodically determining, at a frequency determined based on the stored frequency of the signal, whether a current peak voltage level of the signal is different than the stored peak voltage level of the signal and whether a current valley voltage level of the signal is different than the stored valley voltage level of the signal;
• means for determining, based on whether the current peak voltage level of the signal is different than the stored peak voltage level or the current valley voltage level of the signal is different than the stored valley voltage level, whether the AC signal has been removed from the x-capacitor;
• and
• means for discharging the capacitor in response to determining that the AC signal has been removed from the x-capacitor.