Research Of IGBT Photic Driver Based On Optical Fiber Communication And Power Supply

With the power electronic technology develops gradually to the direction of high power, low loss, high integration, IGBT, as the most typical representative of new generation power semiconductor devices, has the characteristics of high input resistance, conduction low dissipation, high withstand high voltage, high switching frequency and switch speed and so on due to its combination of MOSFET and GTR performance, and it is widely used in various kinds of variable flow system. As one of the key technologies of IGBT application, IGBT driver circuit’s performance directly determines IGBT and the whole device system can be work safely and reliably. So it is of great significance to design a sort of IGBT drive with a high level of integration, applicability and good performance.The paper describes in detail and analyses the basic structure, working mechanism and drive requirements of IGBT, and application field, the performance requirements and developing situation of drive circuit. It combines with the advantages of optical fiber communication, optical fiber communication system’s basic structure and the working mechanism and application of light-emitting and light-receiving devices such as LED and photocell in photoelectric devices, and then puts forward a kind of IGBT photic driving technology combining with IGBT drive, optical fiber communication and photoelectric device’s applications. In view of the IGBT photic driving technology’s application, the paper designs a kind of IGBT photic driver based on optical fiber communication and power supply. The driver uses FPGA as the control center and collects optical transmitter, optical fiber line, optical receiver, independent power supply module as a whole.IGBT photic driver designed in this paper includes FPGA command control module, optical transmitter module, optical receiver module and fiber optic lines. As pulse command controller, The FPGA control module adopts EP1C3T144C8 of EP1 C series as the control center with 48 MHZ clock controlling, and equips with basic peripheral module circuit such as reset circuit, FLASH configuration circuit and serial interface configuration download. Light emitter uses basic amplifying circuit with BJT common collector as a signal modulation and drive circuit, high power white led as light source to implement the conversion of electrical signal and power to light signal and energy. Optical receiver, as a whole of signal demodulation, power supply and IGBT drive, adopts the cadmium sulfide photocell for light receiving power supply module, the Pt19-21 C photocell for optical signal demodulator. Output voltage signal from demodulator outputs after through the voltage amplification, level shift and pulse transformation and implements the IGBT turn-on at pulse high level rise along and turn-off at negative pulse. As transmission medium of light wave, fiber optic line connects light emitter at one end and optical receiver at the other end.This paper uses tools including proteus,saber,quartusII to simulate and optimize control module, optical transmitter, optical receiver and the relevant circuit, builds module circuit to waveform test, and then uses the Altium Designer to complete PCB layout design. Finally, completes intellectual property application of "Photic driving IGBT device based on the single fiber power supply and pulse signal transmission " and master’s thesis writing.