基于LED光供电的高压设备温度在线监测系统

On-line Temperature Monitoring System for High-voltage Equipment Based on LED Light Energy

针对高压设备无线测温装置供电困难问题,设计了一种由低压侧LED光源供电的新型温度在线监测系统。系统使用LED所产生的光能经太阳能电池光电转换后为高压侧无线测温装置供电,以保证其可靠运行。设计了LED两级可PWM调光恒流驱动电路,为LED提供了恒定电流的同时保证了输入端高功率因数。无线测温装置利用热敏电阻PT1000采集温度信号,并通过ANT无线模块进行数据传输,兼具高精度测量和低功耗优势。实验测得无线测温装置在3.3 V供电电压下的平均消耗电流约7.24 m A,驱动电路在满PWM占空比下输出电流为584 m A,在70%PWM占空比下的工作状态为兼顾高压侧电路可靠运行与节约电能的最佳状态。

For power supply of wireless temperature measuring device of high-voltage equipment, a new on-line temperature monitoring system powered by low-vohage LED light was designed. A solar cell was used to convert LED light energy to electric energy for reliable operation of the high-voltage wireless temperature measuring device. A two-stage PWM dimming constant current LED driver was designed to provide constant current for LED and ensure high power factor at input terminal. Temperature signals are eoUected with thermistor PT1000 and transmitted with ANT wireless communication module in the wireless temperature measuring device, which has the advantages of high precision and low power. the wireless temperature is 584 mA with PWM＇s dition, in which reliable Experiments measuring device is 7.24 mA full duty cycle. The working show that the average current consumption of under 3.3 V voltage, and the output current of the driver condition with 70% of PWM＇s duty cycle is the best con- operation of high-voltage circuit and nower saving are halanced.