CN201805270U - High-reliability 25Hz electronic power supply with novel detection device - Google Patents

Abstract

The utility model belongs to the measurement control technology, and provides a high-reliability 25Hz electronic power supply with a novel detection device in order to overcome the defects in the prior art. The electronic power supply consists of main and standby circuits of a track power supply, main and standby circuits of a local power supply, a switching control part, an isolation and shaping processing part of sampling signals, a single chip, an alarm mechanism and a switching execution mechanism. According to the scheme, a blind area of missing detection is overcome by adopting detection point backward movement; operation of the sampling signals, judgment of detection results and execution of motion are controlled by using the single chip; waveform, frequency, phase angle and amplitude value of the output of the 25Hz inverted power supply are detected and compared; and when the parameter change reaches the specified critical value, alarm is given out or main and standby switching is performed to ensure accurate operation of the power supply part. The sent switching and alarm are performed according to the specification of a truth table. The detection part of the scheme has the advantages of simple structure, low cost, accurate and stable operation and high reliability.

Description

High reliability 25Hz electronic power supply with novel detection device

Technical field: the utility model belongs to the control class technology of measuring.It is specifically related to detect with single-chip microcomputer the structure of some physical quantity equipment of 25Hz electronic power supply.

Background technology: railway 25Hz power supply mainly adopts the high-frequency inversion mode at present, owing to adopt a large amount of electronic devices and components and the complicated course of processing, the reliability of each monomer power supply is lower, in order to improve the reliability of system, adopt two working forms that power supply is active and standby each other, when wherein automatically switching to stand-by power supply continuation power supply behind a power failure.But still there is the deficiency of following four aspects in the power-supply device that uses at present, restricted the further raising of its reliability: the function that does not 1. detect the output phase angle: the 25Hz power supply is powered to phase-sensitive track circuits, the 25Hz power supply has two output voltage, be track output voltage and local output voltage, electricity is isolated mutually, railway voltage is AC220V, frequency 25Hz, local voltage is AC110V, frequency 25Hz, for improving antijamming capability, require leading railway voltage 90 degree in phase angle of local voltage, in the prior art, phase place to output voltage does not detect, guarantee on signal criterion that just this phase angle is the lead relationship of 90 degree, but reality there are on signal criterion a plurality of links can cause phase error; 2. there are public part in protective circuit and inversion operating circuit, when the sampling of public part, protective circuit can't detect the overvoltage, under-voltage unusual of output when benchmark was out of order, and lost protective effect; 3. the detection signal of prior art is taken from the front end of switching device, node behind the switching device becomes the detection blind area, detect when promptly fault occurring for some point in the entire circuit less than, after problem appears in these points, also just can't switch to stand-by power supply, cause the output interruption; 4. the output waveform distortions degree is not detected, the high distortion factor can influence the operate as normal of track circuit, influence traffic safety, the iron mark requires less than 5%, there are a plurality of link faults can cause this index exceeding standard in the existing power supply, but existing power supply does not detect this index, and the primary power cource damage can not switch to standby, repeatedly causes the parking accident.What the signalling arrangement of railway special use required is accurate, stable and high reliability, and the deficiency that existing power-supply system is existed is a problem demanding prompt solution.

Summary of the invention: the purpose of this utility model is for solving not enough special this programme that proposes that aforesaid 25Hz inverter exists---have the high reliability 25Hz electronic power supply of novel detection device.It has adopted novel checkout gear, solved the isoparametric detection of phase angle, amplitude, frequency and waveform distortion of power supply output, report to the police when parameter reaches critical value and make active and standby switching, impel timely repairing or change module, normally move to guarantee power safety reliably.

By as above design, the high reliability 25Hz electronic power supply that this programme proposes with novel detection device, it is characterized in that its power unit is provided with the 220V of track circuit needs, the 110V that the power supply of 25Hz and local circuit need, power supply two parts of 25Hz, and the master of two parts circuit, be equipped with the front and back sampling of switching controls, deliver to the single-chip microcomputer of detection, before the track circuit switching controls, after the circuit sampled signal signal is amplified and improves 15～18 pin that current potential is sent into single-chip microcomputer, 11 of single-chip microcomputer output through isolating transformer and operational amplifier, 12 foot control systems actuator and alarm mechanism.

In this programme, its alarm mechanism is to be made of switching tube Q201 and load-relay K201 thereof.Its actuator is made of the light-operated switch 4U4 that switching tube Q202 controls.

Adopt this programme can embody following superiority: 1. to exist the forward blind area that has detection of sampling point, will move behind the sampling point among the design, the effect of detection is improved in view of prior art; 2. this programme has increased the detection of the effective value of phase angle, waveform distortion and amplitude, and the parameter of various measurement gained relatively reaches processing by single-chip microcomputer by the predetermined sequential operation of importing; 3. the sampled signal of each input carries out with the mode of isolating, and adopts independent isolating transformer, and the purpose of isolation is to prevent the mixed electricity of track and locally supplied power source, avoids the phase mutual interference; 4. signal processing is the big and current potential raising of signal of telecommunication amplitude change with input, effect is that the converting electrical signal that will send into becomes to be fit to the Chip Microcomputer A conversion, can successfully carry out voltage magnitude, frequency, the detection of phase distortion degree, provide alarm signal according to the threshold value of setting, and the active and standby switching of control power supply; 5. this programme is to carry out automatically under single-chip microcomputer and preset program thereof, has that speed is fast, precision is high, provides and repair signal exactly in advance, guaranteeing that signalling arrangement normally moves, for the normal operation of the whole railway system creates good conditions.

Description of drawings: Fig. 1 is the electrical schematic diagram of this programme.

Fig. 2 is the design logic figure of this programme.

Fig. 3 is the truth table that this programme sends the effective value of reporting to the police and switching.

Embodiment: the high reliability 25Hz electronic power supply that this programme has a novel detection device is to reform to design on there is the basis of defective in the 25Hz of prior art electronic power supply, it has adopted singlechip technology that waveform, phase angle, amplitude and the frequency of inverter output voltage are measured comparison, when degenerating the critical value that reaches predetermined, measured parameter sends warning, realize preceding the repairing in advance of fault, when some component wear breaks down, it can in time switch to stand-by circuit, guarantees the whole system operate as normal.Sampling point is placed on the output node in this programme, avoid the blind area detected, sampled signal is through transformer isolation, and handle through the operational amplifier shaping, amplitude is strengthened and the current potential raising, send into single-chip microcomputer C8051F330D and carry out calculation process, import 1～4 for before the switching of track power supply, before latter two sampled signal and locally supplied power source switch, after totally four numerical value input of two sampled signals, when reaching the critical value at edge, certain designated parameter sends alarm signal and the warning of active and standby switching signal through the processing of single-chip microcomputer, when send warning, when carry out the regulation of active and standby switching, carry out by single-chip microcomputer by the truth table among Fig. 2.When alarm signal was sent, 12 human hair combing wastes of single-chip microcomputer went out high potential, and alarm signal is sent in the relay redirect that switch controlled is reported to the police.When switching signal was sent, 11 pin of single-chip microcomputer became high potential, made the action of control light-operated switch, carried out handover operation.Use the inverter even running automatically of this programme, when alarm signal occurring, alarm signal is not left alone without help continuously, impels the timely handling failure of staff, or changes module.Whole being operated under the program that single-chip microcomputer imports in advance moved, and it is accurate, strict that complicated work is accomplished, guarantees power unit stable operation, to guarantee the safe operation of the railway system.

Claims (3)

1. high reliability 25Hz electronic power supply with novel detection device, it is characterized in that its power unit is provided with power supply two parts of 110V, the 25Hz of the power supply of the 220V of track circuit needs, 25Hz and local circuit needs, and in the sampling of the front and back of the active and standby switching controls of two parts circuit, deliver to the single-chip microcomputer of detection, the forward and backward circuit sampled signal of track circuit switching controls amplifies signal and improve 15～18 pin that current potential is sent into single-chip microcomputer through isolating transformer and operational amplifier, and 11,12 pin of single-chip microcomputer output connect actuator and alarm mechanism.

2. according to the described high reliability 25Hz electronic power supply with novel detection device of claim 1, the alarm mechanism that it is characterized in that it is to be made of switching tube Q201 and relay K 201, and relay is the load of switching tube.

3. according to the described high reliability 25Hz electronic power supply with novel detection device of claim 1, the actuator that it is characterized in that it is made of switching tube Q202 and light-operated switch 4U4, and light-operated switch is the load of switching tube.

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