摘要
实现幅度可控制的电源纹波,对于不同纹波的电压应力下电子产品性能可靠性的研究具有重要的意义。以开关电源为例,通过对其纹波信号进行时频域分析,选择尖顶脉冲作为叠加在开关电源输出上的纹波比较符合实际。为了不破坏尖顶脉冲电路的结构,运用交直流叠加和阻抗变换,对不同纹波的电压应力进行了硬件设计,电路由尖顶脉冲生成、交直流叠加、阻抗匹配三部分组成,解决了电应力加速试验中的应力实现问题。根据试验样本的特点,以样本信号的失真度来构建评价指标,以确定试验的加速应力范围。
It is important that the power PARD（Periodic and Random Deviation） can be controlled to study the performance degradation of electronic products under voltage stress with different PARD.For a switching power,it is more realistic to select the peak pulse as the PARD superposed on the switching power output based on the time domain analysis of the PARD signal.In order to protect the structure of the peak pulse circuit,the AC superposed DC and impedance transformation are used for the hardware design for voltage stresses with different PARD,including the peak pulse generation,ACDC superposition and impedance matching parts.This work solved the stress realization problem in the electrical stress accelerated test.Based on the features of the test sample,the signal distortion of the sample is used as the measure to determine the accelerated stress range in the test.
出处
《电子产品可靠性与环境试验》
2010年第1期32-35,共4页
Electronic Product Reliability and Environmental Testing
