Title :
The Design of Broadband Measuring Leakage Current System Based on TMS320F2812
Author :
Jia, Liu ; Xiaofei, Wang ; Dong, Li
Author_Institution :
Sch. of Photoelectronic Inf. & Commun. Eng., Beijing Inf. Sci.& Technol. Univ., Beijing, China
Abstract :
Leakage current is the most important parameter in measuring electrical safety performance. A leakage current measuring system which meets multiple IEC standards is designed based on TMS320F2812 in the paper. Pretreatment amplifying circuit adopts high precision linear optocoupler HCNR201 and broadband amplifier HA7-5127-5. AD converter is the embeded 12-bit A/D in the DSP. Magnification times of the broadband is amended in piecewise linear approximation by software. This system is suitable for DC~1MHz leakage current measurement, and the test precision achieves ±2%.
Keywords :
analogue-digital conversion; approximation theory; electric current measurement; electrical safety; leakage currents; measurement systems; piecewise linear techniques; wideband amplifiers; DSP; HA7-5127-5 amplifier; IEC standard; broadband amplifier; electrical safety performance measurement; embedded 12-bit A/D convertor; high precision linear optocoupler; leakage current measuring system; piecewise linear approximation; pretreatment amplifying circuit; word length 12 bit; Current measurement; Frequency measurement; Humans; Impedance; Impedance measurement; Leakage current; DSP; leakage current; linear fitting; measure;
Conference_Titel :
Intelligent System Design and Engineering Application (ISDEA), 2010 International Conference on
Conference_Location :
Changsha
Print_ISBN :
978-1-4244-8333-4
DOI :
10.1109/ISDEA.2010.405
