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Multi-power-section voltage and current sampling method, device and system

A voltage-current, multi-power technology, applied in the direction of voltage/current isolation, measuring devices, measuring current/voltage, etc., can solve the problems of increased equipment maintenance, large demand, inconvenient use, etc., to simplify the use process and reduce the pressure of maintenance Effect

Active Publication Date: 2020-06-09
INVT POWER ELECTRONICS SUZHOU CO LTD
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  • Claims
  • Application Information

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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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  • Multi-power-section voltage and current sampling method, device and system
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  • Multi-power-section voltage and current sampling method, device and system

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Embodiment Construction

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0031] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "comprises" indicate the presence of described features, integers, operations, elements and / or components, but do not exclude one or more The presence or addition of other features, integers, operations, elements, components and / or collections thereof.

[0032] It should also be understood that the terminology used in the descrip...

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Abstract

The embodiment of the invention discloses a multi-power-section voltage and current sampling method, device and system. The method is applied to a voltage and current sampling circuit and comprises the following steps: if a voltage and current sampling request is received, analyzing the voltage and current sampling request to obtain an input voltage and current signal and a rated voltage and current level of a frequency converter; controlling an adjusting unit to select a matched preset voltage and current gear so that a first operational amplification unit outputs a corresponding first outputvoltage after receiving the acquired voltage and current signal; converting the first output voltage into a first digital voltage signal; and determining a corresponding compensation coefficient according to a preset compensation coefficient table, thereby enabling the microprocessor to calculate and obtain a second digital voltage signal located in a preset digital voltage range according to thecompensation coefficient, the first digital voltage signal and a preset calculation rule. Multi-power-section voltage and current sampling can be realized, the maintenance pressure is reduced and thecost is saved.

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 stages. Background technique [0002] When the existing frequency converter samples the voltage and current of multiple power segments, the sampling process is usually to first sample the voltage and current through Hall or transformer, and then select The matching voltage and current detection board converts the voltage into a corresponding digital voltage through an operational amplifier, and finally inputs it to the AD port for subsequent calculations. 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...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R15/18
CPCG01R19/00G01R15/18
Inventor 花熙文孙成胜唐小伟陈星申大力
Owner INVT POWER ELECTRONICS SUZHOU CO LTD
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