High-speed multichannel current-voltage multiplexing collection unit and data collection method

Abstract

The invention relates to a high-speed multichannel current-voltage multiplexing collection unit. The high-speed multichannel current-voltage multiplexing collection unit comprises a plurality of current/voltage collection units respectively consisting of a signal conditioning circuit and an ADC sampling circuit which are connected with each other. The high-speed multichannel current-voltage multiplexing collection unit is characterized by also comprising a backboard, and an FPGA, a DSP and a clock module, which are installed on the backboard, all current/voltage collection units are connected to the FPGA, the FPGA is connected to the DSP, and the clock module is respectively connected with the FPGA and the DSP. The high-speed multichannel current-voltage multiplexing collection unit can be applied to a system with the FPGA and DSP which are distributed on different circuit boards, the current collection and voltage collection multiplexing can be realized by the signal conditioning circuit, and multiple circuits of current or voltage data can be simultaneously sampled. Data transmission is carried out by virtue of a LinkPort, so that the data transmission speed is greatly increased, and the data transmission speed can reach 400Mbit/s.

Description

technical field [0001] The invention belongs to the technical field of data acquisition, and relates to a high-speed multi-channel current and voltage multiplexing acquisition unit and a data acquisition method. Background technique [0002] During the design and debugging process of the EMU traction system, it is necessary to monitor various current or voltage analog quantities in the traction system in real time, including input network voltage, network current, intermediate voltage of the converter, three-phase current of the inverter, etc. These key analog quantities need to be accurately collected and transmitted to the processor quickly and reliably, otherwise the traction system cannot be accurately controlled. But the existing current or voltage acquisition system cannot meet its requirements. [0003] The current current or voltage acquisition unit is usually composed of an analog-to-digital conversion module, FPGA, and DSP, and a dual-port RAM is used between the ...

AI Technical Summary

Problems solved by technology

[0005] 2) This scheme is prone to data read and write errors caused by address data contention

[0006] 3) The communication speed of dual-port RAM is slow, and it is difficult to guarantee the data reading and control speed

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