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AC Drive RegenerationEnergy Flow:ONE - WAYTWO - WAYACInputDCBusCaps+_IGBTsM• Current flows back into the DC bus, via the IGBT switching & back diodes.• AC Drive front-end rectifier is unidirectional; energy cannot flow back into the ACline.• Some returned energy is dissipated in losses in the capacitors, switches, andmotor windings (10-15%).• Excessive regeneration can cause problems, such as DC Bus Overvoltage.24
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