Current signal output circuit for microcomputer protection device and microcomputer protection device

Abstract

The invention provides a current signal output circuit for a microcomputer protection device and the microcomputer protection device. The current signal output circuit comprises an input resistor, a signal amplifier, a sampling resistor, a differential circuit and a negative feedback resistor, one end of the input resistor is connected with an external to-be-converted voltage end, the other end of the input resistor is connected with a reverse input end of the signal amplifier, an output end of the signal amplifier is connected with a non-inverting input end of the differential circuit, and two ends of the sampling resistor are respectively connected with the non-inverting input end and the reverse input end of the differential circuit. One end of the sampling resistor connected to the reverse input end is a current output end, the current output end is connected with an external supply circuit, one end of the negative feedback resistor is connected with the output end of the differential circuit, and the other end is connected with the reverse input end of the signal amplifier. The microcomputer protection device solves the technical problems that a current signal transmission circuit of a microcomputer protection device in the prior art is sensitive to temperature change and electromagnetic interference, and meanwhile the signal precision and response speed are poor.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a current signal output circuit for a microcomputer protection device and the microcomputer protection device. Background technique [0002] With the development of my country's power system and the progress of microelectronics technology, the application of microcomputer protection devices in the field of power generation has become more and more extensive, and the technical indicators such as the accuracy of signals sent by the centralized control system, response speed, and anti-interference ability have also gradually proposed more technical indicators. High requirements, and the signal accuracy, linearity, response speed and stability output by the microcomputer protection device also directly affect the power regulation ability of the power system. [0003] However, the microcomputer protection device transmission current signal circuit in the prior art often adopts a relativel...

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Problems solved by technology

[0004] Based on the above problems, the present invention proposes a current signal output circuit and a microcomputer protection device for a microcomputer protection device. The present invention solves the problem that the transmission current signal circuit of a microcomputer protection device in the prior art is sensitive to temperature changes and electromagnetic interference, and at the same time The accuracy and response speed of the signal are also relatively poor, which often leads to the control imbalance of the power system, and because of the slow response speed, the adjustment speed cannot be effectively adjusted quickly according to the change of power demand, which may easily cause system oscillation and lead to serious downtime accidents.

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