摘要
本文设计了一种基于高线性度高带宽模拟光耦HCNR201芯片的MHz光耦隔离放大器电路,主要应用于计算机数据采集系统中,对其信号进行隔离从而实现过电压保护和提高共模抑制比.HCNR201光耦器件具有双光电二极管结构,使电路在输入端构成反馈环节,消除了光耦的电流传输比对直流增益的影响,为了方便分析建立了它的等效电路.利用线性控制系统的理论方法建立了所设计的隔离放大器电路的数学模型,推导出了电路的传递函数,对电路进行了理论分析和参数优化,并给出了分析设计结果.同时研制了隔离电路并对其进行了实验测试,实验结果与理论分析结果比较一致,符合设计要求,其理论分析方法可以为类似电路设计提供参考.
An optocoupler isolation amplifier with MHz bandwidth is designed based on HCNR201. It is mainly used in com- puter data acquisition system, and isolates the signal to realize over-voltage protection and improve the common mode rejection ra- tio, The HCNR201 consists of double photodiodes which can form a feedback loop in the input port to eliminate the impact of cur- rent Iransfer ratio of the optocoupler on the DC gain. This paper presented the equivalent circuit of HCNR201 for facilitate analysis. This paper built mathematical model of the circuit, derived the transfer function, and gave theoretically analysis and optimized the parameters. We presented the analysis and design resnlts,and the experiment test of the circuit consistent with theoretical analysis is given. The optocoupler isolation amplifier meets the requirements and the theoretical analysis method can provide reference for simi- lar circuit design.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2014年第7期1398-1402,共5页
Acta Electronica Sinica
基金
国际热核聚变实验堆(ITER)计划专项"聚变装置特种电源技术及其系统研究"(No.2010GB108001)
国家磁约束核聚变能发展研究专项"等离子体破裂瞬态电磁和热载荷实验研究"(No.2013GB113003)
关键词
光耦
隔离放大器
数学模型
isolation amplifier
optocoupler
mathematical model
