Synchronous isolation sampling direct-current power meter of wide voltage and large current

Abstract

The invention discloses a synchronous isolation sampling direct-current power meter of wide voltage and large current. The synchronous isolation sampling direct-current power meter of the wide voltage and the large current comprises a hardware watchdog, a digital signal processor (DSP), a field-programmable gate array (FPGA), a storage unit, a left optical isolation switch, a right optical isolation switch, a left second order sigma-delta modulator, a right second order sigma-delta modulator, a resistor voltage-dividing gear switching circuit and a differential operational amplifier gear switching circuit. The resistor voltage-dividing gear switching circuit, the differential operational amplifier gear switching circuit, the FPGA and the DSP form a control system. The synchronous isolation sampling direct-current power meter of the wide voltage and the large current achieves high-accuracy measurements of synchronous isolation sampling of the wide voltage and the large current within a whole range. Based on a DSP mathematical algorithm, measurements of high-accuracy power, ampere-hours and watt hours are achieved by synchronously isolating sampling voltage and current signals.

Description

technical field [0001] The invention relates to a wide-voltage and high-current synchronously isolated sampling DC power meter, which belongs to the technical field of measurement and control. Background technique [0002] As the national high-tech research and development plan (863 plan) listed electric vehicles and related technologies as development topics, the research on battery maintenance equipment has been put on the agenda. When battery manufacturers test a group of batteries, they need to measure the total discharge voltage, total discharge current, discharge power, discharge ampere-hour and discharge watt-hour of the modules connected in series, so as to evaluate the overall performance and usage of the battery. basis. On the other hand, as a battery charging device, it is also necessary to measure the parameters of the total charging voltage, total charging current, charging power, charging ampere-hour and charging watt-hour, as the feedback of the charging cont...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a wide voltage, high current and high precision synchronous isolation sampling DC power meter that can overcome the above technical problems. The wide voltage and high current synchronous isolation sampling DC power meter of the present invention aims to solve the battery pack test During the process, the sampling of the total voltage and total current is not synchronized, resulting in inaccurate measurement of power, ampere-hour and watt-hour. At the same time, advanced Σ-Δ analog-to-digital conversion technology and optimized isolation measures are adopted to simplify the isolation design of the sampling circuit. The intermediate link ensures the high linearity of sampling measurement, thus meeting the high-precision requirements of voltage, current, power, ampere-hour and watt-hour measurement in the full-scale range of wide voltage and high current

Images