CAJ | 학술논문

平面变压器可减小开关电源的体积，同步整流可提高低压大电流开关电源的效率。以对称半桥式电路为主电路、TL494为控制芯片、采用平面变压器和同步整流技术研制了一台48V／5V（12A）高功率密度开关电源，该电源具有过流、过载保护功能；同时，给出了主电路和控制电路的设计方案、平面变压器参数的计算过程。实验结果表明，该电源满载时输出电压纹波峰峰值仅为10mV，效率可达90％，体积仅有50mm×45mm×30mm。
평면변압기가감소개관전원적체적，동보정류가제고저압대전류개관전원적효솔。이대칭반교식전로위주전로、TL494위공제심편、채용평면변압기화동보정류기술연제료일태48V／5V（12A）고공솔밀도개관전원，해전원구유과류、과재보호공능；동시，급출료주전로화공제전로적설계방안、평면변압기삼수적계산과정。실험결과표명，해전원만재시수출전압문파봉봉치부위10mV，효솔가체90％，체적부유50mm×45mm×30mm。
Planar transformer can reduce the size of switching power supply, and synchronous rectifier can improve the efficiency of low voltage high-current switching power supply. In this paper, with the symmetrical half-bridge circuit as the main circuit and TL494 as the control chip, a 48 V/5 V (12,4) high power density switch power supply is developed by using of planar transformers and synchronous rectification. The power supply has the function of over-current, overload protection; at the same time, the paper shows the design of main circuit and control circuit and calculation process of the planar transformers parameter. Experimental results show that the peak of power supply output voltage ripple at full load is only 10 mV, efficiency is up to 90%. the volume is only 50 mm× 45 mm×30mm.