State Key Laboratory of Extreme Environment Optoelectronic Dynamic Measurement Technology and Instrument,North University of China,Taiyuan 030051,China
Aiming at the demand of an industrial test system for simultaneous measurement of multi-channel DC high-voltage signal parameters, a multi-communication interface multi-channel high-precision high voltage acquisition test system is designed. The system adopts a logic controller centered on a field programmable gate array (FPGA), and supports 16 voltage signal inputs. The system supports Gigabit Ethernet, LVDS and RS422 interfaces for data interaction, and is equipped with host computer software to realize human-computer interaction, and the collected data is saved by the host computer. The system reduces the high voltage proportionally to a safe low voltage for subsequent measurement and processing by connecting multiple high-precision sampling resistors in series, uses an AD824ARZ-14 op amp to follow the voltage after voltage division, uses FPGA as the main control unit, and uses an AD7616BSTZ A/D converter with a resolution of 16 bits to collect voltage. Verified in actual engineering projects, the system can achieve high-precision measurement of 16 DC voltage signals ranging from 1 000 V to 1 000 V, with a signal sampling frequency of 20 Hz~1 kHz and a parameter measurement error of less than 0.1%. It can also realize data interaction through three communication interfaces and accurately record the data through the host computer, meeting the design requirements of the task book and providing an important reference for the industrial optimization design of DC high voltage.
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