Railway three-phase signal power supply voltage/current acquisition circuit

Abstract

The invention discloses a railway three-phase signal power supply voltage / current acquisition circuit which comprises a multi-way simulation switch circuit, an amplification circuit, a filtering circuit, an A / D conversion circuit and a microprocessor which are connected in sequence, wherein an A-phase voltage isolation sampling circuit, a B-phase voltage isolation sampling circuit, a C-phase voltage isolation sampling circuit, an A-phase current isolation sampling circuit, a B-phase current isolation sampling circuit and a C-phase current isolation sampling circuit are connected with the input end of the multi-way simulation switch circuit; the A-phase voltage isolation sampling circuit, the B-phase voltage isolation sampling circuit and the C-phase voltage isolation sampling circuit all consist of electronic transformers T, diodes D1 and diodes D2; the A-phase current isolation sampling circuit, the B-phase current isolation sampling circuit and the C-phase current isolation sampling circuit all consist of current transformers CT, diodes D3 and diode D4. The railway three-phase signal power supply voltage / current acquisition circuit is reasonable in design, high in voltage and current acquisition precision, high in anti-interference property and high in working reliability, and electric isolation is achieved.

Description

technical field [0001] The invention relates to the technical field of voltage and current acquisition, in particular to a voltage and current acquisition circuit of a railway three-phase signal power supply. Background technique [0002] At present, most of the voltage and current collection methods of railway three-phase signal power supply adopt V / F and synchronous signal collection methods, while the collection objects of railway power supply voltage and current are mostly traction power supply systems. The characteristics of the traction power supply system are that the system load changes greatly, and the high-order harmonic pollution is serious. After the external power grid is disturbed, the power system contains high-order harmonics, and it is easy to divide the synchronous pulse width into the sum of several pulse widths, and the software acquisition only corresponds to One of the pulse widths outputs data, and the output data changes when the pulse width changes, ...

AI Technical Summary

Problems solved by technology

The characteristics of the traction power supply system are that the system load changes greatly, and the high-order harmonic pollution is serious. After the external power grid is disturbed, the power system contains high-order harmonics, and it is easy to divide the synchronous pulse width into the sum of several pulse widths, and the software acquisition only corresponds to One of the pulse width output data, the output data changes when the pulse width changes, resulting in poor accuracy of the acquisition circuit, and even garbled characters

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