Patent ID: 8816625
Filing Date: 2014-08-26
Classification: H02M,H02P,H03K

Abstract:
1. An integrated AC regenerative motor drive, comprising: a switching rectifier having first and second DC output nodes; an intermediate DC circuit comprising at least one capacitance, a first DC current path including a first conductive plate connected to the first DC output node of the rectifier, and a separate second conductive plate spaced from the first conductive plate, and a second DC current path connected to the second DC output node of the rectifier, the at least one capacitance being connected between the second conductive plate and the second DC current path; an inverter comprising a first DC input node connected to the second conductive plate, a second DC input node coupled with the second DC current path; a precharging circuit comprising a current limiting component, a diode, and at least one insulated gate bipolar transistor (IGBT) precharge switching device connected between the first and second conductive plates of the intermediate DC circuit; and a controller operative in first, second, and third modes to provide switching control signals to the switching rectifier, the precharging circuit and the inverter to precharge the at least one capacitance of the intermediate DC circuit through the current limiting component of the precharging circuit in a first mode, to conduct regenerative current from the intermediate DC circuit through the diode of the precharging circuit in a second mode, and to conduct DC current through the IGBT of the precharging circuit and convert DC power from the intermediate DC circuit to provide AC electrical power to an AC motor load in a third mode.