A 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, which belong to the technical field of voltage measurement, including a primary side module, which is used to generate a corresponding current signal according to an input high-voltage signal, and output a current signal and an oscillation signal; The voltage module is connected with the primary side module, and converts the high voltage signal into a low voltage signal according to the oscillation signal; the output module is connected with the voltage transformation module, and is used to output the low voltage signal after rectification and filtering. A self-powered DC voltage measurement control circuit provided by the present invention adopts a dual voltage divider circuit and supplies power to the oscillation circuit separately through the second voltage divider circuit, realizing the self-power supply function without additional external power supply, greatly reducing the use cost and At the same time, it also avoids the impact of the current consumption of the oscillation circuit on the overall measurement accuracy and measurement range, and improves the measurement accuracy and measurement range.

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

Images