在许多便携式设备中，其开关电源的噪声和电磁干扰(emi)是亟待解决的问题，比较好的办法是利用扩频技术来减少EMI信号的功率成分。
In many portable instruments, the noise and EMI of its switch power supply must be solved, the preferable method is that EMI power is reduced with spread spectrum frequency technique.
此新型材料特别适用于开关电源中的功率变换器，即使不满载时，也可达到最佳效率。
The new material is thus particularly suitable for power converters in switch-mode power supplies, allowing optimized efficiency even at partial load.
大功率通信高频开关电源的噪声干扰中除了有谐波的传导干扰外，还存在电磁的辐射干扰问题。
In high-frequency switching power supply, influence on switching power supply by the more parasitic transformer parameters is increasing.
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