一种基于频率同步的低噪声电源适配器设计

A Low Noise Power Adapter Design with Frequency Synchronization

针对电源适配器高频开关信号的噪声干扰对某些精密仪器性能(如B超机显示清晰度)的影响问题,提出通过适配器开关频率和系统设备工作频率同步方式解决噪声干扰的设计思路。以便携式B超机电源适配器设计实践为例,介绍了同步电路的设计方法、功率电路拓扑和辅助电源方案。同步功能通过实验验证,采用该方案的电源适配器已成功应用于某全球知名B超机产品。

Based on the problem that noise interference from high-frequency switching signal of power adapter affects the performance of some precision instruments such as B ultrasound machine display clarity,a design idea of frequency synchronization between the adapter switching frequency and system operating frequency is presented. By portable B ultrasonic machine power adapter design as an example,the design method of synchronizing circuit and design schemes of power circuit topology and auxiliary power are introduced. By test,the power adapter has the frequency synchronization function and has been successfully applied to the world-famous B ultrasound machine products.