Design Of Nano-diamond Coating FED Driving Circuit

Nowadays, the research of FED devices with its inherent advantages has been a hot research. With the development of FED cathode materials, FED driving circuit has been more and more important. The traditional high-voltage DC power-supply has big bulk and power dissipation, and low efficiency. The design of high-frequency high-voltage power-supply for FED driving circuit using switching power-supply technology is discussed in this paper. With the high-voltage design, a low-voltage power-supply has been designed for the power-supply of IC and dot-matrix controller.By testing the FED samples with the nano-diamond power coating cathode, FED samples with wide gap need high-voltage to drive, and general parameters are gained. With the detailed analysis of the types of power-supply and circuit topologies, the PWM-Flyback circuit is selected. The analysis and calculation of relative parameters of high-voltage and low-voltage transform is primarily researched in this paper, and a practical calculation is given. A Flyback circuit design is achieved for FED driving circuit. Primary circuit is consisted of PWM circuit, high-voltage transform and feedback circuit and its output is high-voltage, which can be controlled. Assistant circuit is consisted of PWM circuit, low-voltage transform and its output is low-voltage (5V/24V) that is stable. Using the power-supply software Saber the Flyback circuit is simulated. PCB is made, and sample circuit board is produced and tested. The result of low-voltage part is consistent with anticipative design.