Voltage frequency conversion high voltage isolating circuit for use in voltage measurement in photovoltaic power station

Abstract

The invention relates to a voltage frequency conversion high voltage isolating circuit for use in voltage measurement in a photovoltaic power station. The circuit comprises an input voltage interface, wherein the anode end of the input voltage interface is connected with a high voltage ground after being serially connected with a twenty-fifth resistor through a divider resistor; the twenty-fifth resistor is connected with an in-phase end of a first calculation amplifier through a twenty-second resistor; an output end of the first calculation amplifier is connected with an opposite-phase end of a second calculation amplifier through a twelfth resistor, and is connected with an in-phase end of the second calculation amplifier through a thirtieth resistor; the opposite-phase end of the second calculation amplifier is connected with an output end of a twentieth resistor, and is connected with a DIS end through a forty-fifth resistor; an output end of the second calculation amplifier is connected with an output end CVOLT (Control Voltage) end; an output end of a timer is connected with an optical coupler thyristor; and a conversion output end is formed at one end of a secondary loop of the optical coupler thyristor. With the adoption of the circuit, the long-term stabilized operation of an isolating voltage acquiring circuit is ensured, and the convenient detection and measurement of the high voltage isolating simulation quantity is realized.

Description

technical field [0001] The invention relates to a voltage-frequency conversion high-voltage isolation circuit, especially a voltage-frequency conversion high-voltage isolation circuit used in photovoltaic power station voltage measurement, specifically for high-voltage monitoring of photovoltaic panels in photovoltaic power stations, monitoring The isolated DC voltage can be as high as above 1000V, which belongs to the technical field of photovoltaic voltage monitoring. Background technique [0002] With the development of society, the demand for energy is becoming increasingly tense. China is very rich in solar energy resources. Accelerating the construction of photovoltaic power plants is not only in line with my country's national conditions, but will also more effectively promote the transformation of my country's economic structure and the optimization of energy structure. With the development of computer technology, people have higher and higher requirements for the m...

AI Technical Summary

Problems solved by technology

It is difficult to achieve high precision

Moreover, as time gets longer and the light-emitting diodes age, the acquisition accuracy will decrease accordingly.

Therefore, the existing problems of the original circuit: 1. High cost; 2. High requirements for optocoupler devices; 3. Large measurement error, and the accuracy will decrease after a long time

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