CAJ | 학술논문

混沌信号具有类随机、连续频谱的特性，混沌调制用于直流开关变换器可以扩展频谱，抑制电磁干扰（EMI）。但实际产生的混沌信号频谱具有一定的范围，如由蔡氏电路产生的模拟混沌信号，具有一个特殊频率并以之为中心左右基本对称的频谱范围，这个频率为中心频率并由电路的实际参数所决定。本文以BUCK变换器为例，采用外接蔡氏电路作为模拟混沌信号发生器，分别选用合适中心频率的混沌信号，实施混沌化占空比和混沌化频率的方案，通过计算机仿真结果进行对比，验证了混沌调制具有改善电磁兼容（EMC）的性能，且混沌化频率的方案抑制EMI效果更明显。
혼돈신호구유류수궤、련속빈보적특성，혼돈조제용우직류개관변환기가이확전빈보，억제전자간우（EMI）。단실제산생적혼돈신호빈보구유일정적범위，여유채씨전로산생적모의혼돈신호，구유일개특수빈솔병이지위중심좌우기본대칭적빈보범위，저개빈솔위중심빈솔병유전로적실제삼수소결정。본문이BUCK변환기위례，채용외접채씨전로작위모의혼돈신호발생기，분별선용합괄중심빈솔적혼돈신호，실시혼돈화점공비화혼돈화빈솔적방안，통과계산궤방진결과진행대비，험증료혼돈조제구유개선전자겸용（EMC）적성능，차혼돈화빈솔적방안억제EMI효과경명현。
Chaos modulation was applied to suppress electromagnetic interference (EMI) in DC converters by expand-ing the spectra because the chaotic signal has characteristics of pseudo random and continuous spectrum. Actually the frequency band of chaotic signals is limited by its generator. The analogue chaotic signal produced by Chua's circuit has its oscillating frequency centered at the limited band, which is decided by the parameters of some components, such as the inductor and the capacitors. With BUCK converters as an example, two different schemes of chaos modulation with an external Chua's circuit were designed. As the result, the chaotic duty and the chaotic frequency of PWM were verified to flatten the amplitude of the fundamental and harmonics of the switching frequency in the simulation with Saber 7.0. It should be pointed out that the latter was better to reduce EMI, though some ripples appeared in output voltages.