Systems and methods for testing a capacitor in a circuit

A method comprising performing, with one or more controllers, operations including:

• connecting a capacitor to a discharge network;
• after a first time period, disconnecting the capacitor from the discharge network and applying a testing voltage to the capacitor;
• after a second time period, disconnecting the testing voltage from the capacitor and connecting the capacitor to a voltage detection circuit;
• measuring, at the voltage detection circuit, a voltage at the capacitor, as a measured voltage;
• comparing the measured voltage against a threshold voltage;
• and
• responsive to the comparing, determining whether the capacitor is connected or disconnected.

A system comprising:

• a testing circuit configured to test a capacitor, the testing circuit comprising:
• a testing voltage source configured to output a testing voltage to the capacitor;
• a discharge network configured to dissipate power from the capacitor;
• a voltage detection circuit configured to measure a voltage of the capacitor, as a measured voltage;
• a first switch configured to connect the capacitor to a main circuit, wherein the main circuit is configured to operate independently from the testing circuit;
• a second switch configured to connect the capacitor to the discharge network;
• a third switch configured to connect the capacitor to the testing voltage source;
• and
• a fourth switch configured to connect the capacitor to the voltage detection circuit;
• and
• one or more controllers configured to (i) control an operation of the first switch, the second switch, the third switch, and the fourth switch to test the capacitor using the testing voltage source, the discharge network, and the voltage detection circuit and (ii) determine, from the measured voltage, whether the capacitor is connected to the testing circuit.