CN103475230B - Railway signal condition monitoring and steady power supply unit - Google Patents

Abstract

The invention discloses a kind of railway signal condition monitoring and steady power supply unit, comprise two the rectifier filter circuit and the first break-make device circuit that are connected with transformer for railway signal output; SEPIC converter circuit, current sampling and supervisory circuit, window voltage comparator circuit, restart circuit fast, logic processing circuit and the second break-make device, the second break-make device output connects optical signal cell and alarm condition output circuit. Circuit of the present invention can be tackled multiple emergency case in real time, has improved the reliability of semaphore. In the time that the LED of railway signal lamp spoilage reaches 30%, when keeping optical signal cell to work on, beam back alarm signal to Central Control Room; In the time that the LED lamp spoilage in railway signal exceedes 50%, when positive closing optical signal cell, beam back alarm signal to Central Control Room; When railway signal occur short circuit, under-voltage, while the abnormal conditions such as opening circuit, turn-off railway signal, and beam back alarm signal to Central Control Room.

Description

Railway signal condition monitoring and steady power supply unit

Technical field

The present invention relates to a kind of railway signal condition monitoring and steady power supply unit, belong to circuit engineering field.

Background technology

At present, domestic generally adopt power frequency transformer for railway signal (as BXI-34 type) to railway signal send outLight unit (as incandescent lamp, LED luminosity scale etc.) power supply. Because the output voltage of transformer for railway signal can be subject toThe impact of input voltage fluctuation and mounting distance and changing, in actual applications, is easy to affect luminescence unitWith the duty of status monitoring circuit, even can cause semaphore luminosity to change, supervisory circuit mistakeThe serious result such as action.

In the time that mounting distance alters a great deal, although can pass through to change the mode of connection of transformer for railway signal,Eliminate to a certain extent the line voltage distribution decay of AC220V. But this adjustment by the mode of connection is not connectContinue, adjusting range is very limited, and can cause the problems such as line complexity; Meanwhile, pass through railway signalThe line regulative mode of transformer cannot be tackled the fluctuation in the input line voltage short time at all.

Summary of the invention

Technical problem to be solved by this invention is to overcome defect of the prior art, designs a kind of dependable performanceRailway signal condition monitoring and steady power supply unit, the power supply of this railway signal condition monitoring and steadyUnit need have following functions: can be at set input voltage range endoadaptation continuous or discontinuous voltage change,Constant output predetermined voltage, accurately the malfunction of automatic detection signal machine, input voltage state,The parameters such as output current state, and carry out corresponding state and automatically adjust, there is fast start-up performance repeatedly,And can send fault alarm.

For solving the problems of the technologies described above, the invention provides a kind of railway signal condition monitoring and steady power supply listUnit, is characterized in that, comprises the first rectifier filter, first being connected with the output of transformer for railway signalRectifier filter and the first break-make device circuit; The output of the first rectifier filter connects SEPIC converter electricityRoad, SEPIC converter circuit output connects current sampling and supervisory circuit and window voltage comparator circuit,Restart fast the output of circuit and transformer for railway signal output, the second rectifier filter and output break-make deviceEnd connects, and current sampling is connected logic processing circuit and the second break-make device, second with the output of supervisory circuitBreak-make device output connects output on-off control circuit and window voltage comparator circuit, the output of output break-make deviceEnd connects optical signal cell; The output of the second rectifier filter circuit connects window voltage comparator circuitInput, the output of window voltage comparator circuit connects logic processing circuit, logic processing circuit defeatedGo out end and connect the first break-make device, the second break-make device and alarm condition output circuit; The output of the first break-make deviceConnect capacitive load compensation net circuit.

In the circuit of described first, second rectifier filter, by the second end AC2 of transformer for railway signal outputConnect after resettable fuse F with first end AC1 as power supply input circuit;

Between two power line AC1-AC2 and ground, be connected with safe electric capacity; Between two power lines, meet piezo-resistance RV1;Two groups of rectification circuits of cross-over connection between two power lines;

In described the first rectifier filter, after described first end AC1, the second end AC2 are connected with rectifier bridge BR1,By exporting a high voltage VH+ after filtering;

In described the second rectifier filter, after described first end AC1, the second end AC2 are connected with rectifier bridge BR,By difference output voltage DV and DV1 after filtering and dividing potential drop.

Described the first rectifier filter output voltage V H+ is connected to respectively one in described SEPIC converter circuitThe drain electrode of transistor T 1; The source electrode of transistor T 1 connects the VCC pin of controller U1, is controller U1Power supply; High voltage VH+, by being connected to the control end of controller U1, controls the start-stop of controller U1; PowerThe source electrode of switching tube QP connects non-essential resistance network, connects the Sense of controller U1 by resistance R S3 simultaneouslyPin, monitors power switch tube current; The Ngate pin of controller U1 connects the grid of power switch pipe QPThe utmost point, output gate drive voltage driving power switching tube QP; Output voltage V P1 is through the first electric resistance partial pressure netNetwork is connected to the Vfb pin of controller U1, and feedback signal is provided; In described SEPIC converter circuit, arrangeTwo output current sample points.

The output voltage V P1 of described SEPIC converter circuit is connected to described current sampling and supervisory circuitIn a pin of chip U5 on, be chip U5 power supply; The output current of described SEPIC converter circuitBe connected to respectively on two other pin of U5; The output voltage V P1 of described SEPIC converter circuit simultaneouslyBy the second resistance pressure-dividing network and three end adjustable shunt reference source TRE obtain reference voltage VCSA andVCSB；

In described current sampling and supervisory circuit, also comprise two comparators, the 6A comparison in two comparatorsThe in-phase end of device, the end of oppisite phase of 6B comparator are all connected with the output of chip U5,6A comparatorEnd of oppisite phase connects reference voltage VCSA, and the in-phase end of 6B comparator connects reference voltage VCSB;

The output of described 6A comparator, 6B comparator is connected in described logic processing circuit.

The output voltage V P1 of described SEPIC converter circuit is passed through in described window voltage comparison circuitThe 3rd resistance pressure-dividing network and three end adjustable shunt reference source T2 obtain the upper voltage limit of window voltage comparison circuitValue Vref1 and lower voltage limit value Vref2; One defeated by what connect the 4th comparator U4 after supply voltage VP dividing potential dropEnter pin IN+, lower voltage limit value Vref2 connects another input pin IN-of the 4th comparator U4; By instituteThe output voltage DV1 that states rectifier filter B respectively with upper voltage limit value Vref1 and lower voltage limit value Vref2Relatively, in the time that voltage DV1 is greater than upper voltage limit value Vref1, the state of output L is not subject to supply voltage VPState impact, output L exports high level; When voltage DV1 is less than upper voltage limit value Vref1 and under being greater thanWhen voltage limit value Vref2, the state of output L is determined by supply voltage VP, if supply voltage VP isWhile being effectively loaded work piece, output L output high level, if supply voltage VP is 0 while being non-loaded,Output L output low level; In the time that DV1 is less than lower voltage limit value Vref2, no matter whether is with and carries, outputEnd L is 0; Described output L is connected with described output on-off control circuit.

Decision logic in described logic processing circuit is:

When LED lamp spoilage reaches 30% but while not reaching 50%, in described current sampling and supervisory circuitThe output terminals A of 6A comparator is low level, and 6B comparator output terminal B is low level;

In the time that LED lamp spoilage reaches 50%, the output terminals A of 6A comparator is low level, 6B comparisonDevice output B is high level.

The output terminals A of the 6A comparator in described current sampling and supervisory circuit is connected to described alarm conditionThe grid of the transistor T 8 in output circuit, the colelctor electrode of transistor T 8 is connected with relay J K1, described inRelay J K1 trigger alarm signal.

Described output on-off control circuit is connected with described window voltage comparison circuit, the control of described output break-makeIn circuit, comprise by the output L in described window voltage comparison circuit and auxiliary magnet control conducting or cut-offMultiple switching tubes;

When LED spoilage is lower than 50% time, make to keep connecting between output L and load by described switching tube;

In the time that LED spoilage reaches 50%, make to be disconnected between output L and load by described switching tube.

Described capacitive load compensation net circuit comprises the switching that described two groups of rectification circuits is carried out to capacitive compensationEnd SW, SW1, SW2; In the time that LED lamp is working properly, drop into first group of capacitive load compensation net, increase electricityStream makes the adhesive of Central Control Room electric current relay; In the time that LED lamp spoilage reaches 30%, the SW of capacitance compensation net andSW2 connects, second group of capacitive load compensation net of switching, and compensation reduces because LED lamp damages the electric current causing;In the time that LED lamp spoilage reaches 50%, the SW of capacitance compensation net and SW1 and SW2 disconnect, and excise two groups of appearancesProperty load compensation net, disconnect the electric current relay of Central Control Room; When occur overcurrent, under-voltage, while the situation such as opening circuit,The electric current relay that disconnects Central Control Room, sends alarm signal.

Described restart fast circuit, comprise input voltage observation circuit, switch driving circuit, the first switchPipe and second switch pipe; Input voltage observation circuit is connected with the output of transformer for railway signal, and switch drivesMoving circuit connects respectively the grid of the first switching tube and second switch pipe, the drain electrode of the first switching tube and source terminalBe connected with output and the ground wire of the second rectifier filter respectively, the drain electrode of second switch pipe and source terminal are respectivelyBe connected with supply voltage and the ground wire of system supply load; When transformer for railway signal powered on moment, the first HeSecond switch Guan Jun is in cut-off state; When the moment of transformer for railway signal power down, the first and second switchesGuan Juncong cut-off state is transitioned into conducting state, and voltage remaining system is discharged fast.

The beneficial effect that the present invention reaches:

1. designed window voltage comparison circuit, effectively judged whether transformer output end voltage has band and carry energyPower, carries and is not with the two kinds of situations of carrying according to output band, set window voltage comparison circuit higher limit and underLimit value, according to judged result, emit signal or cut-off signals;

2. design capacitive load compensation net, can change electric current and voltage phase place, adjusted reactive power ratio.First group of load compensation circuit of switching in the time that LED signal lamp is normally worked, increases electric current, makes the electricity of Central Control RoomCurrent relay can adhesive, and normal relay indicating light is bright; Switching in the time that LED signal lamp spoilage reaches 30%Two groups of load compensation circuit, make up because LED lamp damages the electric current reducing, and ensure that circuit works on;When LED signal lamp spoilage reaches 50%, disconnect all load compensation circuit, reduce electric current, electric current is continuedElectrical equipment enough disconnects.

3. designed logic processing circuit, can make break-make device A or the action of output break-make device according to sampled signal,Complete the automatic processing of normal work or various abnormal conditions.

4. designed current sampling and supervisory circuit, in the time that the abnormal conditions such as overcurrent or short circuit appear in circuit, logicalCross logic processing circuit and make to export the action of break-make device, complete abnormal conditions self-shield.

Tool of the present invention can be at set input voltage range endoadaptation continuous or discontinuous voltage change, constant defeatedGo out predetermined voltage, accurately the malfunction of automatic detection signal machine, input voltage state, output electricityThe parameters such as stream mode, and carry out corresponding state and automatically adjust, there is fast start-up performance repeatedly, and can send outThe warning of being out of order. Possess according to abnormal degree occurs, in the time there are abnormal conditions, beam back warning to Central Control RoomSignal or the function that railway signal is unconditionally turn-offed. Design perfect abnormal conditions self-protection circuit, canReply emergency case in real time, the reliability of semaphore has obtained larger improvement. When the LED of railway signal lampWhen spoilage reaches 30%, signal lamp, in working on, is beamed back alarm signal to Central Control Room; Work as railwayThe supply voltage of semaphore is lower than 150V, can not ensure that semaphore is normally worked time, or in railway signalLED lamp spoilage exceedes 50%, can not normal illumination time; Or there are short circuit or the abnormal feelings of overcurrent in railway signalWhen condition, all will unconditionally turn-off railway signal.

Brief description of the drawings

Fig. 1 is structure connection diagram of the present invention;

Fig. 2 is rectifier filter A and the B structure connection layout in Fig. 1;

Fig. 3 is the SEPIC transformer configuration connection layout in Fig. 1;

Fig. 4 is current sampling and the monitoring structure connection layout in Fig. 1;

Fig. 5 is the window voltage comparator structure connection layout in Fig. 1;

Fig. 6 is logic processing circuit and the alarm condition output circuit structure connection layout in Fig. 1;

Fig. 7 exports break-make device structure connection layout in Fig. 1;

Fig. 8 is the output break-make control structure connection layout in Fig. 1;

Fig. 9 is break-make device A and the capacitive load compensation net circuit structure connection layout in Fig. 1;

Figure 10 restarts circuit diagram in Fig. 1 fast.

Detailed description of the invention

Below in conjunction with accompanying drawing, the invention will be further described. Following examples are only for more clearly explanationTechnical scheme of the present invention, and can not limit the scope of the invention with this.

1. the transformer for railway signal BXI-34 parameter adopting:

Input (primary voltage side) I1-I2:180V, I1-I3:220V two group interfaces; Output (secondary voltageSide) II1-II2:13V, tri-kinds of interfaces of II1-II3:14V and II1-II4:16V.

2. adopt accessible some the set parameter request of railway signal of the present invention:

(1) working power voltage scope: AC150-265V, unconditional shutdown signal machine during lower than AC150V;

(2) the electric current monitor current range of railway signal: point 40mA and two kinds of threshold power specifications of 60mA(be more than or equal to 40mA and 60mA automatic pick, otherwise disconnect).

(3) for the system that uses major-minor filament, first-selected main filament power supply. In the time that main filament damages, automatically cutChange to auxiliary filament, and start alarm relay.

(4) for using LED luminosity scale, in the time that luminosity scale LED damages 30%, start alarm relay.In the time that luminosity scale LED damages 50%, unconditionally close the parts of giving out light of railway signal, start alarm relay,Electric current monitor on AC220V line is disconnected.

Be illustrated in figure 1 railway signal condition monitoring of the present invention and steady power supply unit schematic diagram. RailwayThe output of semaphore transformer connects rectifier filter A, B circuit and break-make device A circuit; Rectifier filterThe output of A circuit connects SEPIC converter circuit, and SEPIC converter circuit output connects current samplingWith supervisory circuit and window voltage comparator circuit, restart fast circuit and transformer for railway signal output,The second rectifier filter, window voltage comparator and the output of output break-make device are connected, current sampling and prisonThe output of control circuit connects logic processing circuit and output break-make device, and output break-make device output connects outputOn-off control circuit and window voltage comparator circuit, output break-make device output connects optical signal cell; WholeThe output of stream wave filter B circuit connects the input of window voltage comparator circuit, window voltage comparatorThe output of circuit connects logic processing circuit, and the output of logic processing circuit connects break-make device A, output is logicalDisconnected device and alarm condition output; The output of break-make device A connects capacitive load compensation net circuit.

Figure 2 shows that the circuit of rectifier filter A, B, one end AC2 of transformer for railway signal output connects certainlyRecover after fuse F with other end AC1 as power supply input circuit.

Safe electric capacity Y1, Y2 are connected between power line and ground (AC1-E, AC2-E), dry for suppressing common modeDisturb; Piezo-resistance RV1 is connected between two power lines (AC1-AC2), during for overtension, and fusing insuranceSilk F, holding circuit. SW-SW1, SW-SW2 is respectively two groups of rectification circuits, between cross-over connection input. WholeStream wave filter A: sent into the rectifier bridge BR1 being attached thereto, rectifier bridge by AC1, AC2 after foregoing circuitBR1 is by a high voltage VH+ of filter capacitor CP output; Rectifier filter B: in AC1, AC2 processAfter stating circuit, send into the rectifier bridge BR being attached thereto, BR is by filter capacitor CH1, CH2 and resistance R A1, RA2Output voltage DV and DV1 after network, capacitor C H3 and CH4 are for starting fast and filtering.

SEPIC converter circuit shown in Fig. 3, connects the rectifier filter A output voltage V H+ of Fig. 2 respectivelyBe connected to drain electrode, input filter capacitor C3 and the inductance L 1 of resistance R 1, transistor T 1. Inductance L 1, power are openedClose pipe QP, coupling capacitance C4 and C5, inductance L 2, commutation diode D1, output filter capacitor C6 and C7,Technics of Power Electronic Conversion controller U1 forms SEPIC switching power circuit. The source electrode of transistor T 1 connects to be controlledThe VCC pin of device U1, is controller U1 power supply, and controller is selected LTC1871, the LTC3803 of Linear companyDeng integrated circuit; Voltage VH+ connects U1's by resistance R 1, diode DZ1, capacitor C 1, resistance R 2Ith/Run pin, controls the start-stop of controller U1; The source electrode of power switch pipe QP connects non-essential resistance network,The Sense pin that simultaneously connects controller U1 by resistance R S3, monitors switching current; The Ngate of U1 drawsPin connects the grid of power switch pipe QP, output gate drive voltage driving power switch QP. Output voltageVP1 is connected to the Vfb pin of U1 through the resistance pressure-dividing network being made up of resistance R 4, R3, R3A, provideFeedback signal. SIN+ and SIN-are output current sample point. In the present embodiment, output voltage V P1 is 14.5V.

Below with a specific embodiment explanation SEPIC converter design process:

Input voltage V_inCan normally work at AC6.5-20V (DC8.0-30V has deducted rectifier bridge pressure drop 0.8V),Output voltage V_OConstant is DC14.5V, rated current I_OFor 2.0A.

Input and output voltage and dutycycle relation:

$\frac{V_O+V_D}{V_{\mathrm{in}}}=\frac{D}{D-1},$

In above formula, V_OFor output voltage, V_inFor input voltage, V_DFor the conducting of rectifying schottky diode forwardPressure drop, D is switching tube working signal dutycycle.

The maximum duty cycle expression formula of circuit is:

$D_{\mathrm{MAX}}=\frac{V_O+V_D}{V_{\mathrm{IN}\left(\mathrm{MIN}\right)}+V_O+V_D};$

Expression formula between input current, inductive current and output current is:

$L_{L1\left(\mathrm{MAX}\right)}=I_{\mathrm{IN}\left(\mathrm{MAX}\right)}=I_{O\left(\mathrm{MAX}\right)}\·\frac{D_{\mathrm{MAX}}}{1-D_{\mathrm{MAX}}};$

I_L2(MAX)=I_O(MAX)；

In above-mentioned formula, V_IN(MIN)For input voltage minimum of a value, I_L1(MAX)、I_L2(MAX)For the maximum of inductance L 1 and L2Electric current.

In the time of continuous operation mode, switching tube switching current expression formula is:

I_SW(MAX)=I_L1(MAX)+I_L2(MAX)

Switching tube peak point current expression formula is:

$I_{\mathrm{SW}\left(\mathrm{PEAK}\right)}=(1+\frac{\mathrm{\χ}}{2})\·I_{O\left(\max \right)}\frac{1}{1-D_{\mathrm{MAX}}}$

In SEPIC circuit, the parameter χ span of above formula is 0.2 to 0.4, and getting χ=0.4 here canTo obtain the ripple current DI of inductance_SWExpression formula:

DI_SW=χ·I_SW(PEAK)

The ripple current DI of inductance L 1 and L2_L1=DI_L2, be expressed as:

DI_L1=DI_L2=0.5DI_SW

According to operating frequency f_OSC, input voltage minimum of a value V_IN(MIN), maximum functional dutycycle D_MAXWith ripple electricityStream DI_SW, can obtain the inductance expression formula of separate cores:

$L1=L2=\frac{V_{\mathrm{IN}\left(\mathrm{MIN}\right)}}{0.5{\mathrm{\ΔI}}_{\mathrm{SW}}\·f_{\mathrm{OSC}}}\·D_{\mathrm{MAX}}$

SEPIC circuit in the present invention, the span of inductance is that 1 μ H-100 μ H. works as two inductance togetherTime around on a magnetic core time, get L1=L2, the expression formula of inductance value is:

$L=\frac{V_{\mathrm{IN}\left(\mathrm{MIN}\right)}}{{\mathrm{\ΔI}}_{\mathrm{SW}}\·f_{\mathrm{OSC}}}\·D_{\mathrm{MAX}.}$

Current sampling as shown in Figure 4 and supervisory circuit, by the output of Fig. 3 by current resistor R_inConversionFor voltage V_sense=I·R_S. Pass through input resistance R by electrical connection terminal SIN+ again_inAfter be connected to current sense and putLarge device U5-IN pin, electrical connection terminal SIN-be connected to current sense amplifier U5+IN pin. U5Output voltage V out calculated by following formula:

$V_{\mathrm{out}}=\frac{V_{\mathrm{sense}}\·R_L}{R_{\mathrm{in}}}=\frac{I\·R_S\·R_L}{R_{\mathrm{in}}}$

In above formula, I is for flowing through sample resistance R_SElectric current, V_senseFor sample resistance R_SThe voltage at two ends, V_outForThe voltage of current sense chip U5 output.

Voltage VP1 is simultaneously by the electric resistance partial pressure being made up of resistance R 25, R26, R27, R16, R17, R18Network and three end adjustable shunt reference source TRE obtain operating current threshold values reference voltage VCSA and VCSB. RatioConnect the output of U5 compared with the in-phase end of device U6A, end of oppisite phase connects reference voltage VCSA; Comparator U6B is anti-End connects the output of U5 mutually, and in-phase end connects reference voltage VCSB. When operating current reduces from rated value30%, but while not reaching 50%, the voltage of voltage comparator U6A output terminals A is low level, voltage comparatorThe voltage of the output B of U6B is low level. In the time that operating current reduction meets and exceeds 50%, voltage ratioThe voltage of device U6A output terminals A is low level, and the voltage of U6B output B is high level.

As shown in Figure 5 be window voltage comparison circuit. By the output voltage V P1 of Fig. 3 through by resistance R 5,The resistance pressure-dividing network that R6, R7 form and three end adjustable shunt reference source T2 obtain window voltage comparison circuitUpper voltage limit value Vref1 and lower voltage limit value Vref2. VP is the supply voltage of system supply load, will supplyPiezoelectric voltage VP connects the in-phase end of comparator U4, lower voltage limit value Vref2 after by resistance R 13, R14 dividing potential dropConnect the end of oppisite phase of comparator U4. By the output voltage DV1 of rectifier filter B in Fig. 1 respectively with on ration the power supplyPressure value Vref1 and lower voltage limit value Vref2 comparison, in the time that voltage DV1 is greater than upper voltage limit value Vref1,The state of output L is not affected by supply voltage VP state, and output L unconditionally exports high level; Work as electricityPress DV1 to be less than upper voltage limit value Vref1 and while being greater than lower voltage limit value Vref2, the state of output L bySupply voltage VP determines, if supply voltage VP is when being effectively loaded work piece, output L be that height is electricFlat, if supply voltage VP is that 0(is non-loaded) time, output L is low level; When DV1 is less than lower limitWhen magnitude of voltage Vref2, no matter whether be with and carry, unconditionally close output (L=0).

Logic processing circuit as shown in Figure 6 and alarm condition output circuit, A is Fig. 4 current sampling and monitoringComparator U6A output in circuit, the comparator U6B output that B is Fig. 4, G is auxiliary magnet. Work as LEDLamp spoilage reaches 30% but while not reaching 50%, A is low level, and B is low level, and C is high level,War is high level, connects buzzer BZ, and the output state of relay J K1 transfers " normally closed " to from " often opening "And to Central Control Room output alarm signal; In the time that LED lamp spoilage reaches 50%, A is low level, and B is high electricityFlat, C is low level, if now diode D14 short circuit War be high level, connect buzzer BZ sounding.

Output break-make device circuit shown in Fig. 7, A and B are respectively in Fig. 4 current sampling and supervisory circuit and compareThe output of device U6A and U6B. In the time that LED lamp is normally worked, A end is high level, transistor T 8 conductings,The power supply of VP1 end, by resistance R 30, is lighted normal indicator lamp Lok. Meanwhile, the Chang Kaiduan of relay J K1Adhesive, the indicator lamp of connecting long-range Central Control Room shows normal work; When A end is low level, transistor T 8 closesDisconnected, the voltage of VP1 end, by control winding and the resistance R 31 of relay J K1, is lighted malfunction indicator lamp Lerro.Meanwhile, the normally closed electric shock adhesive of relay J K1, sends failure alarm signal to Central Control Room; Relay J K1Capacitor C L1, CL2, the resistance R L1 of output are used for the spark producing while eliminating electric shock break-make.

Output break-make control structure circuit as shown in Figure 8, L is that the window voltage comparison circuit shown in Fig. 5 is defeatedGo out end, G is the auxiliary magnet in logic processing circuit. When LED spoilage is lower than 50% time, B output low level,Auxiliary magnet G is high level, and switch transistor T 4 is ended, and switch transistor T 3 conductings, protect between output L and loadHold connection, load still works on; In the time that LED spoilage reaches 50%, B exports high level, auxiliary magnetG is low level, switch transistor T 4 conductings, and switch transistor T 3 is ended, and between output L and load, is disconnected.

Capacitive load compensation net circuit as shown in Figure 9, C, J3 are the output of logic processing circuit in Fig. 6,A is the output of comparator U6A in Fig. 4 current sampling and supervisory circuit, and SW, SW1, SW2 are in Fig. 2The capacitive compensation switching end of current rectifying and wave filtering circuit. In the time that LED lamp is working properly, drop into first group of capacitive loadCompensation net (SW-SW1), increases electric current and makes Central Control Room electric current relay be enough to adhesive; When LED lamp spoilage reachesTo 30% time, A is low level, and B is low level, and C is high level, and J3 is low level, and relay J K3 is movingDo, second group of capacitive load compensation net of switching (SW-SW2), compensation subtracts because LED lamp damages the electric current causingLittle; In the time that LED lamp spoilage reaches 50%, A is low level, and B is high level, and C is low level, and JK3 isHigh level, relay J K3 and JK2 disconnect, and by the excision of two groups of capacitive load compensation nets, electric current are reduced,Be enough to allow the electric current relay of Central Control Room disconnect.

As shown in figure 10 restart fast circuit, comprise input voltage observation circuit, switch driving circuit,Switching tube Q1 and switching tube Q2; Friendship (directly) stream input and the railway signal transformation of its input voltage observation circuitWhether the output of device connects, have power supply to provide for monitoring transformer for railway signal. Switch driving circuit dividesThe grid of other connecting valve pipe Q1, Q2, the drain electrode of switching tube Q1 and source terminal respectively with the second rectifying and wave-filteringThe output voltage DV of device is connected with ground wire, the drain electrode of switching tube Q2 and source terminal respectively with window voltage comparisonSupply voltage VP in device circuit is connected with ground wire. In the time that transformer for railway signal has power supply to provide, switching tubeQ1 and Q2 are all in cut-off state; When the moment that transformer for railway signal is stopped power supply to system, switching tubeQ1 and Q2 all produce a transition process from " cut-off state " to " conducting state ", discharge fast DVElectric energy with the storage of VP end. For quick start system is ready again next time.

The above is only the preferred embodiment of the present invention, it should be pointed out that common for the artTechnical staff, not departing under the prerequisite of the technology of the present invention principle, can also make some improvement and changeShape, these improvement and distortion also should be considered as protection scope of the present invention.

Claims (9)

1. railway signal condition monitoring and a steady power supply unit, is characterized in that, comprises the first rectifier filter, the second rectifier filter and the first break-make device that are connected with the output of transformer for railway signal; The output of the first rectifier filter connects SEPIC converter circuit, SEPIC converter circuit output connects current sampling and supervisory circuit and window voltage comparator circuit, restarting fast circuit is connected with the output of transformer for railway signal output, the second rectifier filter and output break-make device, current sampling is connected logic processing circuit and output break-make device with the output of supervisory circuit, output on-off control circuit connects the output of window voltage comparator circuit, and output break-make device output connects optical signal cell and alarm condition output circuit; The output of the second rectifier filter connects the input of window voltage comparator circuit, the output of window voltage comparator circuit is connected logic processing circuit through current sampling with supervisory circuit, and the output of logic processing circuit connects the first break-make device, output break-make device and alarm condition output circuit; The output of the first break-make device connects capacitive load compensation net circuit.

2. railway signal condition monitoring according to claim 1 and steady power supply unit, is characterized in that,

In the circuit of described first, second rectifier filter, after the second end AC2 of transformer for railway signal output meets resettable fuse F with first end AC1 as power supply input circuit;

Between two power lines and ground, be connected with respectively safe electric capacity; Between two power lines, meet piezo-resistance RV1; Two groups of rectification circuits of cross-over connection between two power lines;

In described the first rectifier filter, after described first end AC1, the second end AC2 are connected with rectifier bridge BR1, by exporting a high voltage VH+ after filtering;

In described the second rectifier filter, after described first end AC1, the second end AC2 are connected with rectifier bridge BR, by difference output voltage DV and DV1 after filtering and dividing potential drop.

3. railway signal condition monitoring according to claim 2 and steady power supply unit, is characterized in that,

Described the first rectifier filter output HIGH voltage VH+ is connected to the drain electrode of the transistor T 1 in described SEPIC converter circuit; The source electrode of transistor T 1 connects the VCC pin of controller U1, is controller U1 power supply; High voltage VH+, by being connected to the control end of controller U1, controls the start-stop of controller U1; The source electrode of power switch pipe QP connects non-essential resistance network, connects the Sense pin of controller U1 by resistance R S3 simultaneously, monitors power switch pipe QP electric current; The Ngate pin of controller U1 connects the grid of power switch pipe QP, output gate drive voltage driving power switching tube QP; The output voltage V P1 of SEPIC converter circuit is connected to the Vfb pin of controller U1 through the first resistance pressure-dividing network, feedback signal is provided; Two output current sample points are set in described SEPIC converter circuit.

4. railway signal condition monitoring according to claim 3 and steady power supply unit, it is characterized in that, the output voltage V P1 of described SEPIC converter circuit is obtained to upper voltage limit value Vref1 and the lower voltage limit value Vref2 of window voltage comparator circuit through the 3rd resistance pressure-dividing network in described window voltage comparator circuit and three end adjustable shunt reference source T2; To after supply voltage VP dividing potential drop, connect an input pin IN+ of the 4th comparator U4, lower voltage limit value Vref2 connects another input pin IN-of the 4th comparator U4; By the voltage DV1 of described the second rectifier filter output respectively with upper voltage limit value Vref1 and lower voltage limit value Vref2 comparison, in the time that voltage DV1 is greater than upper voltage limit value Vref1, the state of output L is not affected by supply voltage VP state, and output L exports high level; In the time that voltage DV1 is less than upper voltage limit value Vref1 and is greater than lower voltage limit value Vref2, the state of output L is determined by supply voltage VP, if supply voltage VP is when being effectively loaded work piece, output L output high level, if supply voltage VP is 0 while being non-loaded, output L output low level; In the time that voltage DV1 is less than lower voltage limit value Vref2, no matter whether be with and carry, output L is 0; Described output L is connected with described output on-off control circuit.

5. railway signal condition monitoring according to claim 3 and steady power supply unit, is characterized in that,

Decision logic in described logic processing circuit is:

When LED lamp spoilage reaches 30% but while not reaching 50%, the output terminals A of the 6A comparator in described current sampling and supervisory circuit is low level, 6B comparator output terminal B is low level;

In the time that LED lamp spoilage reaches 50%, the output terminals A of 6A comparator is low level, and 6B comparator output terminal B is high level.

6. railway signal condition monitoring according to claim 5 and steady power supply unit, is characterized in that,

The output terminals A of the 6A comparator in described current sampling and supervisory circuit is connected to the base stage of the transistor T 8 in output break-make device, and the colelctor electrode of transistor T 8 is connected with relay J K1, described relay J K1 trigger alarm signal; The grounded emitter of transistor T 8.

7. railway signal condition monitoring according to claim 5 and steady power supply unit, is characterized in that,

Described output on-off control circuit is connected with described window voltage comparator circuit, comprises by the auxiliary magnet control conducting in output L and logic processing circuit in described window voltage comparator circuit or multiple switching tubes of cut-off in described output on-off control circuit;

When LED spoilage is lower than 50% time, make to keep connecting between output L and load by described switching tube;

In the time that LED spoilage reaches 50%, make to be disconnected between output L and load by described switching tube.

8. railway signal condition monitoring according to claim 5 and steady power supply unit, is characterized in that,

Described capacitive load compensation net circuit comprises the switching end that described two groups of rectification circuits is carried out to capacitive compensation; In the time that LED lamp is working properly, drop into first group of capacitive load compensation net, increase electric current and make the adhesive of Central Control Room electric current relay; In the time that LED lamp spoilage reaches 30%, second group of capacitive load compensation net of switching, compensation reduces because LED lamp damages the electric current causing; In the time that LED lamp spoilage reaches 50%, excise two groups of capacitive load compensation nets, disconnect the electric current relay of Central Control Room; In the time there is overcurrent, under-voltage, open circuit conditions, disconnect the electric current relay of Central Control Room, send alarm signal.

9. railway signal condition monitoring according to claim 1 and steady power supply unit, is characterized in that,

Described restart fast circuit, comprise input voltage observation circuit, switch driving circuit, the first switching tube and second switch pipe; Input voltage observation circuit is connected with the output of transformer for railway signal, switch driving circuit connects respectively the grid of the first switching tube and second switch pipe, the drain electrode of the first switching tube is connected with output and the ground wire of the second rectifier filter respectively with source terminal, and the drain electrode of second switch pipe is connected with supply voltage and the ground wire of system supply load respectively with source terminal; When transformer for railway signal powered on moment, the first and second switching tubes are all in cut-off state; When the moment of transformer for railway signal power down, the first and second switching tubes are all transitioned into conducting state from cut-off state, and voltage remaining system is discharged fast.