CN217880061U

CN217880061U - Isolation protection circuit of locomotive control system

Info

Publication number: CN217880061U
Application number: CN202222208938.5U
Authority: CN
Inventors: 王飞; 杨树广; 于海东; 王虎; 马成; 安猛; 薛鹏雨
Original assignee: Harbin Lengtao Electronic Technology Co ltd
Current assignee: Harbin Lengtao Electronic Technology Co ltd
Priority date: 2022-08-22
Filing date: 2022-08-22
Publication date: 2022-11-22
Anticipated expiration: 2032-08-22

Abstract

An isolation protection circuit of a locomotive control system relates to the field of locomotives. The circuit comprises a filter circuit and an optical coupling isolation circuit; the output end of the filter circuit is connected with the input end of the optical coupling isolation circuit, and the output end of the optical coupling isolation circuit is connected with the input end of the locomotive controller. The circuit comprises a filter circuit for filtering an input signal, and a polar capacitor is arranged, so that the filter effect is better; and inputting the filtered signal into an optical coupling isolation circuit to carry out optical coupling isolation protection on the signal. The problem of signal transmission interference immunity is strong after a programmable logic device is adopted at present is solved.

Description

Isolation protection circuit of locomotive control system

Technical Field

The utility model relates to a locomotive field.

Background

With the rapid development of high-speed railways, a series of updates are made to models of electric locomotives. The control system of the electric locomotive is one of the important indexes for updating the model. In general, the control system of the electric locomotive can be divided into two parts, namely a locomotive control circuit for controlling the operation and control of the equipment state of the locomotive and a speed regulation control system for controlling the speed of the locomotive. The locomotive control circuit mainly realizes the operation control of the states of the equipment in the main circuit and the auxiliary circuit, and finishes the preparation of locomotive servicing and carriage. The locomotive speed regulating control system is mainly used for respectively and independently automatically regulating the traction force and the speed of the locomotive according to the instruction of a driver and the change of load so as to meet the running requirement of transportation production on the premise of adapting to the change of the load.

The traditional electric locomotive adopts a relay control mode to control the state of locomotive equipment, so as to realize the operation of the locomotive. With the development of modern electronic and computer technologies, programmable logic control devices have been used for the logic control of the whole electric locomotive, replacing the original 110V direct current contact control circuit of the locomotive, replacing the original low-voltage electric appliances such as time relays, intermediate relays and the like and a large number of circuitous circuits on the locomotive, and reserving the communication with the microcomputer network of the locomotive. The use of the programmable logic device brings convenience to locomotive control, but also brings a plurality of problems, namely, the input signal and the output signal of the programmable logic device are relatively high in interference, and the signal transmission effect is poor, so that how to solve the problem that the signal transmission interference resistance is high after the programmable logic device is adopted at present is necessary.

SUMMERY OF THE UTILITY MODEL

The utility model relates to a solve the problem that signal transmission interference immunity is strong behind the current programmable logic device that adopts, provide locomotive control system's isolation protection circuit.

The utility model adopts the technical proposal that:

the isolation protection circuit of the locomotive control system is used for carrying out isolation protection on a locomotive controller 3 and comprises a filter circuit 1 and an optical coupling isolation circuit 2;

the filter circuit 1 comprises polar capacitors C1, C2, C3 and a capacitor C4; the optical coupling isolation circuit 2 comprises an optical coupling isolation chip HCPL-0631, a resistor HR11, a resistor HR12, a capacitor HC2 and a 3V power supply; the output end of the filter circuit 1 is connected with the input end of the optical coupling isolation circuit 2, and the output end of the optical coupling isolation circuit 2 is connected with the input end of the locomotive controller 3; the anode and the cathode of the polar capacitor C1 are used as two input ends of the filter circuit 1; the anode of the polar capacitor C1 is simultaneously connected with the anode of the polar capacitor C2, the anode of the polar capacitor C3 and one end of the capacitor C4; the cathode of the polar capacitor C1 is simultaneously connected with the cathode of the polar capacitor C2, the cathode of the polar capacitor C3 and the other end of the capacitor C4; two ends of the capacitor C4 are used as the output end of the filter circuit 1;

in the optical coupling isolation circuit 2, a pin 2 of an optical coupling isolation chip HCPL-0631 is used as one input end of the optical coupling isolation circuit 2, and one end of a resistor HR12 is used as the other input end of the optical coupling isolation circuit 2; a pin 1 of the optical coupling isolation chip HCPL-0631 is connected with the other end of the resistor HR 12; a pin 8 of the optical coupling isolation chip HCPL-0631 is connected with a 3V power supply; a pin 7 of the optical coupling isolation chip HCPL-0631 is connected with one end of a resistor HR11 and serves as an output end of the optical coupling isolation circuit 2; a pin 5 of the optical coupling isolation chip HCPL-0631 is connected with one end of a capacitor HC2, and the other end of the capacitor HC2 is connected with a 3V power supply;

two ends of the capacitor C4 are connected with a pin 2 of the optical coupling isolation chip HCPL-0631 and the other end of the resistor HR 12; and a pin 7 of the optical coupling isolation chip HCPL-0631 is connected with the input end of the locomotive controller 3.

Has the advantages that: the utility model relates to an isolation protection circuit for carry out isolation protection to locomotive control system, the filter circuit that this circuit contains carries out the filtering to the signal of input, inputs to opto-coupler isolation circuit behind the filtering, carries out opto-coupler isolation protection to the signal, has solved the current problem that signal transmission interference immunity is strong behind the logic device that adopts programmable.

Drawings

FIG. 1 is a schematic diagram of an isolation protection circuit of a locomotive control system;

FIG. 2 is a schematic diagram of a light coupling isolation circuit;

fig. 3 is a schematic diagram of a filter circuit.

Detailed Description

The first embodiment,

Specifically describing the present embodiment with reference to fig. 1 to 3, the isolation protection circuit of the locomotive control system according to the present embodiment is used for isolating and protecting a locomotive controller 3, and includes a filter circuit 1 and an optical coupling isolation circuit 2;

In the utility model, the filter circuit contained in the circuit filters the input signal, and the existence of the polar capacitor ensures better filtering effect; the filtered signal is input to an optical coupling isolation circuit to carry out optical coupling isolation protection on the signal, and an optical coupling isolation chip HCPL-0631 is adopted and is an optical coupling logic gate device combined with a GaAsP light-emitting diode and a high-gain light detector, so that an enable input permission detector can be gated. Compact SO8 packaging, 10M high speed. The circuit solves the problem of strong anti-interference performance of signal transmission after the programmable logic device is adopted at present.

The present invention has been described in terms of several specific embodiments, and it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, the utility model can be modified in various ways according to specific conditions or concrete conditions without departing from the scope of the utility model. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. The isolation protection circuit of the locomotive control system is used for carrying out isolation protection on a locomotive controller (3), and is characterized by comprising a filter circuit (1) and an optical coupling isolation circuit (2);

the filter circuit (1) comprises polar capacitors C1, C2 and C3 and a capacitor C4; the optical coupling isolation circuit (2) comprises an optical coupling isolation chip HCPL-0631, a resistor HR11, a resistor HR12, a capacitor HC2 and a 3V power supply; the output end of the filter circuit (1) is connected with the input end of the optical coupling isolation circuit (2), and the output end of the optical coupling isolation circuit (2) is connected with the input end of the locomotive controller (3); the anode and the cathode of the polar capacitor C1 are used as two input ends of the filter circuit (1); the anode of the polar capacitor C1 is simultaneously connected with the anode of the polar capacitor C2, the anode of the polar capacitor C3 and one end of the capacitor C4; the cathode of the polar capacitor C1 is simultaneously connected with the cathode of the polar capacitor C2, the cathode of the polar capacitor C3 and the other end of the capacitor C4; two ends of the capacitor C4 are used as the output end of the filter circuit (1);

in the optical coupling isolation circuit (2), a pin 2 of an optical coupling isolation chip HCPL-0631 is used as one input end of the optical coupling isolation circuit (2), and one end of a resistor HR12 is used as the other input end of the optical coupling isolation circuit (2); a pin 1 of the optical coupling isolation chip HCPL-0631 is connected with the other end of the resistor HR 12; a pin 8 of the optical coupling isolation chip HCPL-0631 is connected with a 3V power supply; a pin 7 of the optical coupling isolation chip HCPL-0631 is connected with one end of a resistor HR11 and serves as an output end of the optical coupling isolation circuit (2); a pin 5 of the optical coupling isolation chip HCPL-0631 is connected with one end of a capacitor HC2, and the other end of the capacitor HC2 is connected with a 3V power supply;

two ends of the capacitor C4 are connected with a pin 2 of the optical coupling isolation chip HCPL-0631 and the other end of the resistor HR 12; and a pin 7 of the optical coupling isolation chip HCPL-0631 is connected with the input end of the locomotive controller (3).