| dc.description.abstract | This paper uses a low-power converter architecture for fast charging: a flyback converter, which converts input AC voltage (110V / 60Hz) into DC voltage (155V) as input, reaching a constant voltage of 5V, 12V 20V output to charge the external load.
It will be roughly divided into three parts, starting with the design of the circuit and the selection of each component, and then confirming the correctness of the calculation results by simulation, the final step is to actually complete the circuit using the PCB board, and measure the waveform, and comparison of simulation results.
The circuit will use silicon (Si) and gallium nitride (GaN) based metal oxide semiconductor field effect transistors to implement the circuit, and compare the differences. In experience, the volume of gallium nitride is smaller and the operating frequency higher, higher conversion efficiency, ideally should be able to obtain better efficiency performance than silicon-based MOSFET.
In terms of operating frequency, the operating frequency of general flyback converters is about 100KHz or lower, but in order to show the high-frequency operating characteristics of gallium nitride, this article will operate the input frequency at 200KHz, the transformer is also selected to be able to operate normally at high frequency, and will not be converted into capacitive because of the high input frequency. | en_US |