Research And Manufacture Of The Multi-phase SPWM Controller Based On FPGA

The series cell topology structure has been becoming a main research tendency in the current high voltage frequency variable field. And so we research and developed a multi-route SPWM controller for the high voltage frequency -variable motor driving system that based on the series cell topology structure. the controller from the SPWM modulating theory is analyzed, at one time, the hardware and software are designed in article. Finally, the controller past the test.Firstly, it is introduced that includes the test platform's system composition, modulating method and fault check method. The test system platform is a platform of series cell high voltage frequency variable system topology structure. By analyzing several modulating method and comparing their advantages and shortcomings, the controller adopts the carrier level phase-shift modulating method at last, and analyzed the SPWM pulse width computing method theoretically. Also introduced the system's existing faults kinds.Secondly, the controller's hardware circuit takes the FPGA as its control kernel is designed, which separately is hardware circuit with pulse expand board and interface. The former part includes design of FPGA and CPLD chip circuit etc; latter part includes CPLD design of fiber interface, fault determinant circuit design and fiber transmission.Thirdly, the system's software is designed. On the basis of hardware design, the controller adopts the VHDL language to program the FPGA and CPLD, and realized the following functions:it can be programmed to receive the SPWM pulse width data from the center DSP board, and produce the SPWM pulse. distribute the produced SPWM pulses to every power cell by optical fiber.sample and collect fault signals from every power cell.encode the fault signal and send it to center control board.Finally, tested the controller on the 6kv/22kw testing platform, by analyzing the testing waves get the results that using this controller in series cell frequency variable speed adjusting system can produce the corrected multi-routes SPWM pulses, and it can check the fault reliably, and the system runs stably, and meet the design requirement.