Double-optocoupler image direct voltage sensor

Abstract

The invention relates to a voltage measurement sensor, in particular to a double-optocoupler image direct voltage sensor. The sensor comprises a detected high voltage signal input end, an image current control circuit and a detection signal output end, wherein the image current control circuit comprises two optocouplers with the same electrical parameter, a voltage comparator and a low-pass filter; an input end of the first optocoupler is connected with a to-be-detected direct current high-voltage power supply anode; an output end of the first optocoupler is connected with an inverted input end of the voltage comparator via a pull-up resistor R2; an output end of the voltage comparator is connected with a low-pass filter circuit; an output of the low-pass filter circuit is connected with an input end of the second optocoupler; an output of the second optocoupler is connected with a non-inverted input end of the voltage comparator via a pull-up resistor R3; the low-pass filter circuit extracts an output signal of the voltage sensor; the resistance of the resistors R2 and R3 is equal. According to the sensor, voltage detection of a high-voltage power supply end of equipment by a low-voltage system in the electrical equipment is achieved, the temperature drift is small, the precision is high, and the high-voltage end is completely isolated from the low-voltage system.

Description

technical field [0001] The invention relates to a DC voltage sensor, in particular to a voltage detection sensor which utilizes a low-voltage system to realize accurate measurement of high-voltage power supply voltage. Background technique [0002] The voltage detection system works in the low-voltage power supply system. In order to detect, remotely monitor and control the high-voltage power supply of electrical equipment, transformers, transformers or magnetic effect sensors are often used as high-voltage transmitters, sensors or voltage couplers. Limited by power and transformation ratio, traditional voltage sensors are bulky, have low voltage detection range, are easily affected by changes in temperature, magnetic circuit, and working environment, have defects such as low measurement accuracy, and temperature drift. Functional fiber optic voltage sensors are expensive, bulky, and have temperature drift, which cannot meet the high voltage detection requirements of the pow...

AI Technical Summary

Problems solved by technology

Since there is no reference comparison under the same conditions, the feedback voltage has fluctuations and cannot be used as a voltage sensing and detection circuit for the measurement system

[0004] Voltage sensors or transmitters mostly use electromagnetic conversion transmission technology, which is large in size, low in accuracy, and low in the measurement voltage range; voltage sensors using functional optical fiber technology are expensive and also have temperature effects

The above voltage sensor is bulky and cannot be directly designed and applied to the low-voltage control system as a device

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