测试用低频正弦电流源的设计与实现  

Research and Implementation on Low-frequency Sine Wave Current Source for Testing

作　　者：程红丽[1] 王利强[1] 刘健[1] 

机构地区：[1]西安科技大学通信与信息工程学院,西安710054

出　　处：《电测与仪表》2010年第1期67-70,共4页Electrical Measurement & Instrumentation

基　　金：新世纪优秀人才支持计划资助项目(NCET050875)

摘　　要：为了满足测试用激励源的要求,提出并实现了一种由预调节开关电压源、开关直流电压源、线性直流正弦电流源、H电桥以及智能控制器组成的测试用低频正弦电流源。H电桥起极性转换的作用;线性直流正弦电流源是系统的输出级,可提高正弦波的质量和动态响应性能;开关直流电压源是系统的中间级,用以减小输出级调整管两端的电压差,提高系统的效率;预调节开关电压源是系统的输入级,对输入电压进行预处理;LPC2138是整个电源的智能控制器。试验结果表明,所提出的方法是可行的,并且具有输出电流稳定、失真度小、频率调节范围宽、频率步进小的特点。In order to meet the requirements of the testing excitation source, a low-frequency sine wave current source is designed and realized. The proposed current source consists of a pre-regulation switching voltage source, a switching DC voltage source, a linear DC sine wave currxent source, an H-bridge and an intelligent controller. The H-bridge can convert the polarity. The linear DC sine wave current source is used to improve the quality of the sine current and the dynamic behavior. The switching DC voltage source is the middle stage, which can reduce the voltage on the regulating transistor and improve the efficiency. The pre-regulation switching voltage source is the input stage, which can regulate the input voltage to a suitable value. LPC2138 is used as the intelligent controller of the whole system. The experiment resuhs show that the proposed current source is feasible, and has the advantages of stable output current, low THD, wide frequency range and small frequency step.

关 键 词：开关电源 低频正弦电流源 H电桥 LPC2138 

分 类 号：TM46[电气工程—电器]