基于线性光耦的多机冗余系统电源检测模块

Multi-machine power testing module based on linearity optocouplers

针对多机冗余系统中需在隔离条件下对多路电源进行准确和快速检测的要求,介绍了采用线性光耦实现电源检测的原理和方法。以某车载监控系统为例,重点分析了线性光耦的光电转换原理、隔离传输性能和外围电路结构,同时介绍了模块中A/D转换和ISA接口电路的设计。测试结果表明,各路电源检测精度均保持在5%以内,工作稳定可靠,满足预期的设计要求。AD1647和CPLD的应用使模块具有结构简洁、精度较高、价格低廉的优点,具有很好的实用推广价值。

The principle and method of power test using linearity optocouplers is introduced.The linearity optocouplers is used to solve accurate and fast detection of multiple power in multi-machine application.With a example of on-train monitor system,the photoelectric conversion principle,isolation transmission performance and peripheral circuit structure is discussed.Also the design of A/D conversion and ISA interface circuit is introduced.It is showed by test results that the measurement accuracy of each channel is kept within 5%.The operation of this module is stable and reliable,and meets the expectations of the design requirements.With the application of AD1647 and CPLD,the module has advantages of simple structure,higher precision and lower cost.The design is practical and valuable to similar applications.