Self-powered DC voltage measurement control circuit and measurement device

Abstract

The invention provides a self-powered DC voltage measurement control circuit and a measurement device, and belongs to the technical field of voltage measurement, and the self-powered DC voltage measurement control circuit comprises: a primary side module which is used for generating a corresponding current signal according to an input high-voltage signal and outputting the current signal and an oscillation signal; a voltage transformation module which is connected with the primary side module and converts a high-voltage signal into a low-voltage signal according to the oscillation signal; and an output module whcih is connected with the voltage transformation module and is used for rectifying and filtering the low-voltage signal and then outputting the low-voltage signal. According to the self-powered DC voltage measurement control circuit provided by the invention, a double-path voltage division circuit is adopted, the oscillating circuit is independently powered through the second voltage division circuit, a self-powered function is realized, an additional external power supply is not needed, and the use cost and space are greatly reduced; meanwhile, the influence of the current consumption of the oscillating circuit on the overall measurement precision and the measurement range is avoided, and the measurement precision and the measurement range are improved.

Description

technical field [0001] The invention belongs to the technical field of voltage measurement, in particular to a self-powered DC voltage measurement control circuit and a measurement device. Background technique [0002] In the application of high-power DC power supply, the system needs to isolate, measure and control the DC high voltage. At present, the DC voltage measurement device mainly adopts the magnetic balance principle, magnetic modulation principle, photoelectric isolation, digital isolation and other methods to realize the isolated measurement of DC high voltage. These methods need to provide a separate standard power supply; the introduction of the standard power supply will increase the cost of the system And complexity, especially in the transformation of the existing site, it is difficult to increase the standard power supply and power supply connection lines due to structural limitations, which limits the application of this type of sensor. [0003] The curren...

AI Technical Summary

Problems solved by technology

At present, the DC voltage measurement device mainly adopts the magnetic balance principle, magnetic modulation principle, photoelectric isolation, digital isolation and other methods to realize the isolated measurement of DC high voltage. These methods need to provide a separate standard power supply; the introduction of the standard power supply will increase the cost of the system and complexity, especially in the transformation of existing sites, it is difficult to increase the standard power supply and power supply connection lines due to structural limitations, which limits the application of this type of sensor

[0003] The current passive DC voltage measuring device has defects such as large temperature drift coefficient and poor mechanical vibration performance, and because the passive DC voltage measuring device adopts a single resistance voltage divider, the current consumption of the oscillation circuit will limit its measurement accuracy and measurement range

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