Abstract: A test system includes a first, second, and third power converter and a data collection system. The test system performs load testing on the second and third power converters without requiring any external load. The first power converter is supplied by an Alternating Current (AC) source. During a test cycle, the first, second, and third power converters are controlled such that the second power converter is supplied by an output current of the first power converter and a feedback current output by the third power converter. The third power converter receives current output by the second power converter and outputs the feedback current onto the second power converter. The data collection system receives power converter test characteristics (voltage, current, and temperature information) during the test cycle without any power being dissipated by an external load. Test information is used to determine whether the second and third power converters are defective.