Continuous testing of high voltage,large current power switches and modules based on reciprocal charging circuit

A reciprocal charging circuit with a small capacity power source was used for periodic firing and extinction tests of high voltage, large current power switches, power modules and even whole systems can be carried. Thus, the system provides an ideal way to replicate the rated-state operating condition including switching voltages and current stresses, controller anti-jamming ability, radiator performance and total system power losses. The test method was utilized to test a three-level NPC converter and the entire DSTATCOM system. The test results agree well with type testing results.