Voltage and current sampling method, device and system for multiple power sections

Abstract

Embodiments of the present invention disclose a multi-power segment voltage and current sampling method, device and system. The method is applied to a voltage and current sampling circuit, wherein the voltage and current sampling method includes, if a voltage and current sampling request is received, analyzing the voltage and current sampling request to obtain the input voltage and current signals and the rated voltage and current level of the inverter; select the matching preset voltage and current gear by controlling the adjustment unit, so that the first operational amplifying unit receives the obtained voltage and current signals and outputs the corresponding first an output voltage; converting the first output voltage into a first digital voltage signal; determining the corresponding compensation coefficient according to a preset compensation coefficient table, so that the microprocessor calculates according to the compensation coefficient, the first digital voltage signal and the preset calculation rule A second digital voltage signal within a preset digital voltage range is obtained. The embodiments of the present invention can realize voltage and current sampling of multiple power sections, reduce maintenance pressure, and save costs.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a voltage and current sampling method, device and system for multiple power sections. Background technique [0002] When the existing frequency converter samples the voltage and current of the multi-power stage, the sampling process is usually to first sample the voltage and current through the Hall or transformer, etc., and then select the rated voltage and current level of the frequency converter to be sampled. The matching voltage and current detection board, and then convert the voltage into the corresponding digital voltage through the operational amplifier, and finally input it to the AD port for the convenience of the post-stage calculation. This method is more convenient when the rated voltage and current levels of the inverter are relatively simple, but when the rated voltage and current levels of the inverter are too many, such as on high-voltage inverters with differen...

AI Technical Summary

Problems solved by technology

This method is more convenient when the rated voltage and current levels of the inverter are relatively single, but when the rated voltage and current levels of the inverter are too many, such as on high-voltage inverters with different rated voltage and current levels, then Each different rated voltage and current level requires a corresponding voltage and current detection board. When sampling, a large number of voltage and current detection boards will be required, which will cause inconvenience in use and increase the pressure on equipment maintenance.

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