CN100361361C

CN100361361C - Intelligent railway signal power source switching module

Info

Publication number: CN100361361C
Application number: CNB031161847A
Authority: CN
Inventors: 刘小宁; 陆文光
Original assignee: Ningbo Baoxin Railway Signal Equipment Manufacturing Co ltd; Institute of Plasma Physics of CAS
Current assignee: Ningbo Baoxin Railway Signal Equipment Manufacturing Co ltd; Institute of Plasma Physics of CAS
Priority date: 2003-04-02
Filing date: 2003-04-02
Publication date: 2008-01-09
Anticipated expiration: 2023-04-02
Also published as: CN1534843A

Abstract

The present invention relates to an intelligent railway signal power source switching module used for automatically switching a railway signal two-way power source. The switching module is composed of a main loop, excess voltage, under-voltage, a phase failure detection circuit, a switching circuit and a driving circuit, wherein the main loop is output by means of a two-way input power source via a switch circuit composed of IGBT tubes connected in series or in parallel. When one path of input power source has the excess voltage, the under-voltage or a phase failure, the failure detection circuit changes corresponding signals sent to the switching circuit from a high level to a low level so as to change the output state of a gate circuit; then, the IGBT tubes are switched off and the IGBT tubes of the other power source is quickly conducted so that the two-way power source is quickly switched. Due to the adoption of a two-way conducting electronic switch composed of the IGBT tubes which can be quickly switched on or off, the excess voltage, the under-voltage and the phase failure of the input power source can be quickly diagnosed and switched in a moment, and time for switching to the other path of power source is less than 2 ms and switching time for regularly repairing the power source is less than 50 mus when one path of power source has a failure.

Description

Intelligent railway signal power supply handover module

Technical field

The present invention relates to the railway traffic management, guarantee the technical field of railway traffic safety, especially relate to the automatic switchover technology field of railway signal double loop power supply.

Background technology

The intelligent power supply panel of the electric centrally connected power supply of railway is to be used for respectively to the semaphore flashing power source, track circuit, electric point machine, dispatching concentration, microcomputer interlocking, relay and control desk and indicating panel provide the power supply of alterating and direct current, for guaranteeing safety of railway traffic, its outside electric power network power supply must be the power supplies of two road power supplys, therefore just need two road power transfer devices, be used for when one road power supply breaks down or during the power supply of regular maintenance road, switch to another road power supply in short time to guarantee the normal power supply of intelligent power supply panel at the utmost point, the Ministry of Railways formulates standard switching time is 150ms, and perfect condition should be to switch the zero-time; It is to be realized switching by the contactor of mechanical contact mostly that existing two road power supplys switch, the Mechanical Contact device is difficult to realize the switching of switching time less than 40ms on the one hand, because of it coil burnout, contact adhesion, machinery fault such as get stuck often appears on the other hand in running, cause the signaling point loss of power accident, seriously disturbed normal driving order; For addressing the above problem, China's utility model patent discloses a kind of " double loop power supply automatic switchover solid-state controller " (patent No.: 02204997.5) it by main road and be equipped with the road input circuit, rectification absorbs circuit, continuous current excitation circuit, controlled power switching circuit and control switching circuit and forms, be 20-30ms its switching time, though can satisfy the Ministry of Railways to the requirement of switching time, switch the big gap of also existence with the zero-time of perfect condition less than the 150ms regulation.

Summary of the invention

The objective of the invention is in order to overcome the deficiency of prior art, provide a kind of and when one road power supply presents fault, switch to the time of another road power supply less than 2ms, the switching time of regular maintenance power supply is less than the intelligent railway signal power supply handover module of 50 μ S, with the rate of failure that effective reduction causes because of switching time is long, improve the security reliability of railway operation.

For achieving the above object, technical scheme of the present invention is: a kind of intelligent railway signal power supply handover module, mainly by major loop, overvoltage, under-voltage and open-phase detection circuit, commutation circuit and drive circuit four parts are formed, wherein major loop is by turn-off device IGBT pipe serial or parallel connection electronic switch and two tunnel input power supplys, be that power supply I (three-phase A1, B1, C1) is connected with power supply II (three-phase A2, B2, C2), output all is connected to three-phase A, B, C, and which power supply of control decision is an electric; Overvoltage, under-voltage and open-phase detection circuit is responsible for the overvoltage to two tunnel input power supplys (power supply I and II), quick diagnosis is carried out in the under-voltage and phase failure, particularly the phase failure detects, should detect the phase failure in the extremely short time distinguishes near the low-voltage band the phase failure and the alternating voltage zero-crossing point again, produce misoperation to avoid that voltage zero-cross is used as the phase failure, this overvoltage, under-voltage and high speed open-phase detection circuit comprises resistance in forming, electric capacity, optocoupler and comparator, respectively to the voltage of two-way power supply input through step-down, and the electric current of input, sample by devices such as linear optical couplings, be connected with comparator, after amplifying, be connected to NOR gate, control IGBT pipe; The signal that commutation circuit is responsible for failure detector circuit is sent here carries out logical operation, judge power failure, signal to the electronic switch of drive circuit shutoff trouble power three-phase then, the electronic switch of conducting normal power source three-phase, thereby when realizing that one road power supply breaks down the utmost point in the short time (less than 2ms) switch to another road power supply, also designed the circuit that prevents two road power electronic switchs of conducting simultaneously in the commutation circuit, the disaster of having avoided two road power supply direct short-circuits to bring, this commutation circuit is by OR-NOT circuit and overvoltage, under-voltage and open-phase detection circuit connects, with overvoltage, the detected signal of under-voltage and open-phase detection circuit, be connected to trigger through NOR gate, reverser is by the photocoupler set control Driver Circuit; The effect of drive circuit is that the signal that commutation circuit is sent here is delivered to the trigger electrode of the electronic switch of each road each phase of power supply exactly by isolating amplification, is IGBT as electronic switch, just delivers to the GE utmost point of IGBT.

The course of work of intelligent railway signal power supply handover module of the present invention is as follows: as the output of A, B, C A1, B1, the C1 from power supply I, normal as all, the first triode J1 conducting in the commutation circuit at this moment, EXBI (the EXB841 inputs of 6 serial connections) has the electric current of 10～25mA to flow through, make the reliable conducting of three-phase IGBT electronic switch of power supply I by drive circuit, power supply I work.And the second triode J2 turn-offs, and the EXBII no current flows through, and the three-phase IGBT electronic switch of power supply II is for turn-offing.In case overvoltage, under-voltage or open phase fault have appearred in power supply I, failure detector circuit is given the corresponding overvoltage of commutation circuit, under-voltage or phase failure signal will become low level from high level, the gate circuit output state that changes can make the first triode J1 turn-off, the three-phase IGBT of power supply I can turn-off rapidly, II is normal as power supply, the second triode J2 is with conducting, drive circuit also will make the three-phase IGBT conducting of power supply II rapidly, the output of A, B, C will so just realize the quick switching of two road power supplys from A2, B2, the C2 of power supply II.In like manner, be power supply II when what just started working, equally also can switch to trouble-free power supply I apace when breaking down.

Owing to adopted technique scheme, utilization is the electronic switch of the two-way admittance that constitutes such as the power electronic device of break-make such as IGBT, IGCT or GTO fast, replace long Mechanical Contact device operate time, the input power supply is carried out the quick diagnosis and the instantaneous switching of overvoltage, the under-voltage and phase failure, the time of having realized switching to another road power supply when one road power supply presents fault, the switching time of regular maintenance power supply was less than 50 μ s less than 2ms.

Description of drawings

The invention will be further described below in conjunction with drawings and Examples.

Fig. 1 is a circuit block diagram of the present invention.

Fig. 2 is major loop figure of the present invention.

Fig. 3 is open-phase detection circuit figure of the present invention.

Fig. 4 is commutation circuit figure of the present invention.

Embodiment

With reference to Fig. 1, a kind of intelligent railway signal power supply handover module of the present invention is mainly by overvoltage 1) major loop, 2), under-voltage and open-phase detection circuit, 3) commutation circuit and 4) drive circuit four parts form;

With reference to Fig. 2-Fig. 4, said major loop, by two tunnel input power supplys, promptly power supply I (three-phase A1, B1, C1) and power supply II (three-phase A2, B2, C2) manage the switching circuit of forming through the turn-off device IGBT with serial or parallel connection, are output as three-phase A, B, C; Said overvoltage, under-voltage and open-phase detection circuit, it comprises resistance, electric capacity, optocoupler and comparator in forming, respectively to the voltage of two-way power supply input and the electric current of input, sample by the linear optical coupling device, be connected with comparator, after amplifying, be connected to NOR gate, control IGBT pipe; Said commutation circuit comprises trigger and reverser, commutation circuit is to be connected by OR-NOT circuit and overvoltage, under-voltage and open-phase detection circuit, respectively with the overvoltage of two road power supplys, the under-voltage and detected signal of open-phase detection circuit, be connected to trigger, reverser through NOR gate, by the photocoupler set control Driver Circuit, this photocoupler set is formed by connecting by EXBI, EXBII, the first triode J1, the second triode J2 and resistance, electric capacity, voltage stabilizing didoe; Wherein EXBI, EXBII are respectively the circuit that the input of 6 chip for driving EXB841 of the electronic switch IGBT of power supply I, power supply II is cascaded and forms; The effect of drive circuit is that the signal that commutation circuit is sent here is delivered to the trigger electrode of the electronic switch of each road each phase of power supply exactly by isolating amplification, is IGBT as electronic switch, just delivers to the GE utmost point of IGBT.

Claims

1, a kind of intelligent railway signal power supply handover module is characterized in that: it is mainly by major loop, overvoltage, under-voltage and open-phase detection circuit, and commutation circuit and drive circuit four parts are formed; Said major loop, by two tunnel input power supplys, promptly power supply I and power supply II manage the switching circuit of forming through the turn-off device IGBT with serial or parallel connection, are output as three-phase A, B, C; Said overvoltage, under-voltage and open-phase detection circuit, it comprises resistance, electric capacity, optocoupler and comparator in forming, by overvoltage, under-voltage and open-phase detection circuit respectively to the voltage of two-way power supply input and the electric current of input, sample by the linear optical coupling device, be connected with comparator, after amplifying, be connected to OR-NOT circuit, be connected with commutation circuit by OR-NOT circuit; Said commutation circuit comprises trigger and reverser, and commutation circuit with the overvoltage of two road power supplys, the under-voltage and detected signal of open-phase detection circuit, is connected to trigger, reverser through OR-NOT circuit, by the photocoupler set control Driver Circuit respectively.

2, a kind of intelligent railway signal power supply handover module according to claim 1, it is characterized in that: said photocoupler set is formed by connecting by EXBI, EXBII, first triode (J1), second triode (J2) and resistance, electric capacity, voltage stabilizing didoe; Wherein EXBI, EXBII are respectively the circuit that the input of 6 chip for driving EXB841 of the electronic switch IGBT of power supply I, power supply II is cascaded and forms.