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Integrated AC regenerative motor drives and operating methods are presented in which a precharging circuit is provided with an IGBT, a diode and a parallel current limiting component in an intermediate DC circuit between a switching rectifier and an output inverter, and the drive is operated in one

Integrated AC regenerative motor drives and operating methods are presented in which a precharging circuit is provided with an IGBT, a diode and a parallel current limiting component in an intermediate DC circuit between a switching rectifier and an output inverter, and the drive is operated in one of three modes for motoring, regenerating and precharging.

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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, a

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; anda 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. 2. The integrated AC regenerative motor drive of claim 1, comprising: a plurality of input terminals coupleable to an AC input source;a plurality of output terminals coupleable to an AC motor;the switching rectifier comprising a plurality of AC nodes coupled with the plurality of input terminals, and a plurality of rectifier switching devices individually coupled between one of the AC input nodes and one of the first and second DC output nodes, the rectifier switching devices individually operative to selectively couple a corresponding AC input node with a corresponding DC output node according to a corresponding rectifier switching control signal;the at least one IGBT precharge switching device of the precharging circuit being operative according to a precharge control signal and including a first power terminal coupled with the first conductive plate and a second power terminal coupled with the second conductive plate;the diode of the precharging circuit including a cathode coupled with the first conductive plate and an anode coupled with the second conductive plate;the current limiting component of the precharging circuit being coupled between the first and second conductive plates;the inverter comprising a plurality of AC output nodes coupled with the plurality of output terminals, and a plurality of inverter switching devices individually coupled between one of the DC current paths of the intermediate DC circuit and one of the AC output nodes, the inverter switching devices individually operative to selectively electrically couple the corresponding DC current path with the corresponding AC output node according to a corresponding inverter switching control signal; andthe controller being operative to provide control signals to the switching rectifier, the inverter and the precharging circuit, the controller being operative in the first mode to provide the control signals to turn the switching devices of the switching rectifier, the precharging circuit and the inverter off to precharge the at least one capacitance through the switching rectifier and the current limiting component, the controller being operative in the second mode to provide the control signals to cause the rectifier to conduct regenerative current from the intermediate DC circuit to the input terminals through the diode of the precharging circuit, and the controller being operative in the third mode to provide the control signals to turn the precharge switching device on, to cause the rectifier to convert input power from the input terminals to provide DC power to the intermediate DC circuit, and to cause the inverter to selectively convert DC power from the intermediate DC circuit to provide AC electrical power to the output terminals. 3. The integrated AC regenerative motor drive of claim 2, wherein the precharging circuit comprises: a plurality of diodes individually including a cathode coupled with the first conductive plate and an anode coupled with the second conductive plate; anda plurality of IGBT precharge switching devices operative according to the precharge control signal, the individual IGBT precharge switching devices including a first power terminal connected to the first conductive plate and a second power terminal connected to the second conductive plate. 4. The integrated AC regenerative motor drive of claim 3, wherein the individual IGBT precharge switching devices are integrated with a corresponding one of the plurality of diodes in the precharging circuit. 5. The integrated AC regenerative motor drive of claim 2, wherein the IGBT precharge switching device and the diode of the precharging circuit are integrated in a single package. 6. The integrated AC regenerative motor drive of claim 2, wherein the controller is operative to provide the rectifier switching control signals in the second mode at a frequency approximately equal to a fundamental frequency of the AC input source. 7. The integrated AC regenerative motor drive of claim 6, comprising an input filter including a plurality of input reactors, individual input reactors being coupled in series between a corresponding one of the input terminals and a corresponding one of the AC nodes of the switching rectifier. 8. The integrated AC regenerative motor drive of claim 2, comprising an input filter including a plurality of input reactors, individual input reactors being coupled in series between a corresponding one of the input terminals and a corresponding one of the AC nodes of the switching rectifier. 9. The integrated AC regenerative motor drive of claim 8, wherein the input filter comprises a plurality of L-C-L filter circuits with individual L-C-L filter circuits including first and second reactors coupled in series between the corresponding input terminals and the corresponding one of the AC nodes, and a filter capacitance coupled between a node joining the first and second reactors and a common terminal. 10. The integrated AC regenerative motor drive of claim 2, wherein the controller is operative to provide the rectifier switching control signals in the second mode using pulse width modulation (PWM) at a frequency at least one order of magnitude greater than a fundamental frequency of the AC input source. 11. The integrated AC regenerative motor drive of claim 10, comprising an input filter including a plurality of L-C-L filter circuits with individual L-C-L filter including first and second reactors coupled in series between the corresponding input terminals and the corresponding one of the AC nodes, and a filter capacitance coupled between a node joining the first and second reactors and a common terminal. 12. The integrated AC regenerative motor drive of claim 2, comprising a further conductive plate connected to the second DC output node of the rectifier, wherein the first and second conductive plates of the first DC current path are separated from the further conductive plate by an intervening electrical insulator layer in a laminated plate structure. 13. The integrated AC regenerative motor drive of claim 12, wherein the at least one IGBT precharge switching device is electrically and mechanically connected to the first and second conductive plates using fasteners for connection through associated holes in the first and second conductive plates. 14. The integrated AC regenerative motor drive of claim 2, wherein the at least one IGBT precharge switching device is electrically and mechanically connected to the first and second conductive plates using fasteners for connection through associated holes in the first and second conductive plates. 15. The integrated AC regenerative motor drive of claim 1, comprising a further conductive plate connected to the second DC output node of the rectifier, wherein the first and second conductive plates of the first DC current path are separated from the further conductive plate by an intervening electrical insulator layer in a laminated plate structure. 16. The integrated AC regenerative motor drive of claim 15, wherein the at least one IGBT precharge switching device is electrically and mechanically connected to the first and second conductive plates using fasteners for connection through associated holes in the first and second conductive plates. 17. The integrated AC regenerative motor drive of claim 1, wherein the at least one IGBT precharge switching device is electrically and mechanically connected to the first and second conductive plates using fasteners for connection through associated holes in the first and second conductive plates. 18. A power conversion system, comprising: a switching rectifier having first and second DC output nodes;a 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;a first DC output terminal connected to the second conductive plate;a second DC output terminal connected to the second DC current path of the DC circuit;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 DC circuit; anda controller operative in first, second, and third modes to provide switching control signals to the switching rectifier and the precharging circuit to precharge the at least one capacitance of the DC circuit through the current limiting component of the precharging circuit in a first mode, to conduct regenerative current from the DC circuit through a diode of the precharging circuit in a second mode, and to conduct DC current through the IGBT of the precharging circuit and to provide DC power from the DC circuit to the DC output terminals in a third mode. 19. The power conversion system of claim 18, comprising a further conductive plate connected to the second DC output node of the rectifier, wherein the first and second conductive plates of the first DC current path are separated from the further conductive plate by an intervening electrical insulator layer in a laminated plate structure. 20. The power conversion system of claim 19, wherein the at least one IGBT precharge switching device is electrically and mechanically connected to the first and second conductive plates using fasteners for connection through associated holes in the first and second conductive plates. 21. The power conversion system of claim 18, wherein the at least one IGBT precharge switching device is electrically and mechanically connected to the first and second conductive plates using fasteners for connection through associated holes in the first and second conductive plates.