开关电源纹波抑制研究

提出开关电源纹波的定义,分析开关电源纹波产生的原因,并提出几种抑制纹波的方法。最后针对一款特殊开关电源,论述了开关电源的输出稳定性问题。该电源输出电流为10A,输出电压为12V,主要用于驱动半导体激光器。为减小输出电流纹波,提高激光功率稳定性,研究分析了几种抑制纹波的方法,包括滤波法,多路叠加法等。该电源的设计采用主、副电源的思路,从主电源采集纹波信号反馈给副电源的控制端,从而使主副电源输出叠加后保持较小的输出纹波。通过实验验证该方法可以使纹波系数保持在1%,使得性能有所提高。

Study on ripple rejection for switching power supply

The ripple of switching power supply is defined.The reason of generating the ripple is analyzed.Several solutions to reject the ripple are proposed in this pepper.Aiming at a special switching power supply,the output stability of the switch power supply is described.This power supply which is used to drive semiconductor laser can output the 12 V voltage and 10 A current.Several methods of ripple rejection such as filtering,multi-channel superposition and so on are studied to reduce the ripple of output current and improve the stability of laser power.The integrated power supply is divided into two parts,the major power supply and minor power supply.The ripple signal which is collected in the major one will be send to the control end of minor one.That can make output ripple of major and minor ones smaller.This method can keep the ripple within 1% which was verified in experiments,and improve the performance of the power supply.