Hold-up capacitance health measurement with current leakage detection

A circuit, comprising:

• a capacitor between a voltage line and ground and having a parasitic resistance;
• a first resistor between the voltage line and a first switch to the ground;
• a second resistor between the first switch and a second switch to the ground;
• and
• a controller coupled to the voltage line and configured to charge the voltage line to a first voltage, discharge the first voltage to a second voltage via the first resistor during a first identified time, discharge the first voltage to the second voltage via the first and second resistors during a second identified time, and determine the parasitic resistance using the first and second identified times.

A circuit, comprising:

• a capacitor between a voltage line and ground and having a parasitic current sink (pis);
• first and second current sinks (is) between the voltage line and first and second respective switches to the ground;
• and
• a controller configured to charge the voltage line to a first voltage, to discharge the first voltage to a second voltage via the first is during a first identified time, to discharge the first voltage to the second voltage via at least the second is during a second identified time, and to determine a current through pis the using the first and second identified times.