CN103475230A - Railway signal machine state monitoring and steady power supply unit - Google Patents

Abstract

The invention discloses a railway signal machine state monitoring and steady power supply unit which comprises two rectifier filter circuits, a first breaker circuit, an SEPIC converter circuit, a current sampling and monitoring circuit, a window voltage comparator circuit, a quick restart circuit, a logical processing circuit and a second breaker, wherein the two rectifier filter circuits and the first breaker circuit are connected with the output end of a railway signal transformer, and the output end of the second breaker is connected with an optical signal unit and a warning state output circuit. The circuits of the unit can deal with various emergencies in real time and improve reliability of a signal machine. When the damage rate of LED lamps of the railway signal machine reaches 30%, the unit sends a warning signal back to a central control room while the optical signal unit continues to work; when the damage rate of the LED lamps of the railway signal machine reaches 50%, the unit sends a warning signal to the central control room while the optical signal unit is turned off forcibly; when the railway signal machine is short-circuited or undervoltag or disconnected or have other abnormal situations, the railway signal machine is shut down, and a warning signal is sent back to the 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 the circuit engineering field.

Background technology

At present, the domestic power frequency transformer for railway signal (as the BXI-34 type) that generally adopts is powered to the luminescence unit (as incandescent lamp, LED luminosity scale etc.) of railway signal.The impact that can be subject to input voltage fluctuation and mounting distance due to the output voltage of transformer for railway signal changes, in actual applications, be easy to affect the operating state of luminescence unit and status monitoring circuit, even can cause the semaphore luminosity to change, the serious result such as supervisory circuit malfunction.

When mounting distance alters a great deal, although can, by changing 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 discontinuous, and adjusting range is very limited, and can cause the problems such as line complexity; Simultaneously, can't tackle the fluctuation of input line voltage in the short time by the line regulative mode of transformer for railway signal at all.

Summary of the invention

Technical problem to be solved by this invention is to overcome defect of the prior art, design a kind of railway signal condition monitoring and steady power supply unit of dependable performance, this railway signal condition monitoring and steady power supply unit need have following functions: can be at set input voltage range endoadaptation continuous or discontinuous change in voltage, the constant output predetermined voltage, the malfunction of automatic detection signal machine accurately, the 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 unit, it is characterized in that, comprise the first rectifier filter, the first rectifier filter and the first break-make device circuit that are connected with the output of transformer for railway signal; The output of the first rectifier filter connects the SEPIC converter circuit, SEPIC converter circuit output connects current sampling and supervisory circuit and window voltage comparator circuit, restarting fast circuit is connected with transformer for railway signal output, the second rectifier filter and the output of output break-make device, current sampling is connected logic processing circuit and the second break-make device with the output of supervisory circuit, the second break-make device output connects output on-off control circuit and window voltage comparator circuit, and output break-make device output connects optical signal cell; The output of the second rectifier filter circuit connects the input of window voltage comparator circuit, the output of window voltage comparator circuit connects logic processing circuit, and the output of logic processing circuit connects the first break-make device, the second break-make device and alarm condition output circuit; The output of the first break-make device connects capacitive load compensation net circuit.

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 the power supply input circuit;

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

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

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

Described the first rectifier filter output voltage V H+ is connected to respectively 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 the non-essential resistance network, connects the Sense pin of controller U1 by resistance R S3 simultaneously, monitors the power switch tube current; The Ngate pin of controller U1 connects the grid of power switch pipe QP, output gate drive voltage driving power switching tube QP; Output voltage V P1 is connected to the Vfb pin of controller U1 through the first resistance pressure-dividing network, feedback signal is provided; Two output current sampling points are set in described SEPIC converter circuit.

The output voltage V P1 of described SEPIC converter circuit being connected on the pin of the chip U5 in described current sampling and supervisory circuit, is chip U5 power supply; The output current of described SEPIC converter circuit is connected to respectively on two other pin of U5; The output voltage V P1 of described SEPIC converter circuit obtains reference voltage VCSA and VCSB by the second resistance pressure-dividing network and three end adjustable shunt reference source TRE simultaneously;

Also comprise two comparators in described current sampling and supervisory circuit, the in-phase end of the 6A comparator in two comparators, the end of oppisite phase of 6B comparator all are connected with the output of chip U5, the end of oppisite phase of 6A comparator 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 obtained to upper voltage limit value Vref1 and the lower voltage limit value Vref2 of window voltage comparison circuit through the 3rd resistance pressure-dividing network in described window voltage comparison circuit and three end adjustable shunt reference source T2; To connect the input pin IN+ of the 4th comparator U4 after supply power voltage VP dividing potential drop, lower voltage limit value Vref2 connects another input pin IN-of the 4th comparator U4; The output voltage DV1 of described rectifier filter B is compared with upper voltage limit value Vref1 and lower voltage limit value Vref2 respectively, and when voltage DV1 is greater than upper voltage limit value Vref1, the state of output L is not affected by supply power voltage VP state, and output L exports high level; When 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 power voltage VP, if supply power voltage VP is when effectively being loaded work piece, output L exports high level, if supply power voltage VP is 0 while being non-loaded, output L output low level; When 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.

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;

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

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

Described output on-off control circuit is connected with described window voltage comparison circuit, comprises a plurality of switching tubes that output L in described window voltage comparison circuit and auxiliary magnet are controlled conducting or cut-off in described output on-off control circuit;

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

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

Described capacitive load compensation net circuit comprises switching end SW, SW1, the SW2 that described two groups of rectification circuits is carried out to capacitive compensation; When the 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 current relay; When LED lamp spoilage reaches 30%, the SW of capacitance compensation net and SW2 connect, second group of capacitive load compensation net of switching, and compensation reduces because the LED lamp damages the electric current caused; When LED lamp spoilage reaches 50%, the SW of capacitance compensation net and SW1 and SW2 disconnect, and excise two groups of capacitive load compensation nets, disconnect the current relay of Central Control Room; When occur overcurrent, under-voltage, while the situation such as opening circuit, disconnect the current relay of Central Control Room, send alarm signal.

Describedly restart fast circuit, comprise input voltage observation circuit, switch driving circuit, the first switching tube and second switch pipe; The 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 ground wire with the output of the second rectifier filter respectively with source terminal, and the drain electrode of second switch pipe is connected with ground wire with the supply power voltage of system supply load respectively with source terminal; When the 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 all are transitioned into conducting state from cut-off state, and the voltage that system is remaining discharges fast.

The beneficial effect that the present invention reaches:

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

2. design capacitive load compensation net, can change the electric current and voltage phase place, adjusted the reactive power ratio.First group of load compensation circuit of switching when the LED signal lamp works, increase electric current, makes the current relay of Central Control Room can adhesive, and the normal operation indicator light is bright; Second group of load compensation circuit of switching when LED signal lamp spoilage reaches 30%, make up because the LED lamp damages the electric current reduced, and guarantees that circuit works on; When LED signal lamp spoilage reaches 50%, disconnect all load compensation circuit, reduce electric current, current relay is enough disconnected.

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

4. design current sampling and supervisory circuit, while the abnormal conditions such as overcurrent or short circuit occurring at circuit, by logic processing circuit, made to export the action of break-make device, completed the abnormal conditions self-shield.

Tool of the present invention can be at set input voltage range endoadaptation continuous or discontinuous change in voltage, the constant output predetermined voltage, parameters such as the malfunction of automatic detection signal machine, input voltage state, output current state accurately, and carry out corresponding state and automatically adjust, there is fast start-up performance repeatedly, and can send fault alarm.Possesses the degree according to abnormal, the function of beaming back alarm signal or railway signal unconditionally being turn-offed to Central Control Room when the abnormal situation.Design perfect abnormal conditions self-protection circuit, can tackle in real time emergency case, the reliability of semaphore has obtained larger improvement.When the LED of railway signal lamp spoilage reaches 30%, signal lamp, when working on, is beamed back alarm signal to Central Control Room; When the supply power voltage of railway signal, lower than 150V, in the time of can not guaranteeing the semaphore normal operation, or the LED lamp spoilage in railway signal surpasses 50%, in the time of can not normal illumination; Or railway signal all will unconditionally turn-off railway signal while short circuit or overcurrent abnormal conditions occurring.

The accompanying drawing explanation

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 is output 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.

Embodiment

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

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

Input (primary voltage side) I1-I2:180V, I1-I3:220V two group interfaces; Output (secondary voltage side) 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: minute 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 of using the major-minor filament, first-selected main filament power supply.When main filament damages, automatically switch to auxiliary filament, and start alarm relay.

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

Be illustrated in figure 1 railway signal condition monitoring of the present invention and steady power supply unit schematic diagram.The output of railway signal transformer connects rectifier filter A, B circuit and break-make device A circuit; The output of rectifier filter A circuit connects the SEPIC converter circuit, SEPIC converter circuit output connects current sampling and supervisory circuit and window voltage comparator circuit, restarting fast circuit is connected with transformer for railway signal output, the second rectifier filter, window voltage comparator and the output of output break-make device, current sampling is connected logic processing circuit and output break-make device with the output of supervisory circuit, output break-make device output connects output on-off control circuit and window voltage comparator circuit, and output break-make device output connects optical signal cell; The output of rectifier filter B circuit connects the input of window voltage comparator circuit, and the output of window voltage comparator circuit connects logic processing circuit, and the output of logic processing circuit connects break-make device A, output break-make 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, an end AC2 of transformer for railway signal output connects after resettable fuse F with other end AC1 as the power supply input circuit.

Safe electric capacity Y1, Y2 are connected between power line and ground (AC1-E, AC2-E), for suppressing common mode disturbances; Piezo-resistance RV1 is connected between two power lines (AC1-AC2), during for overtension, and fuse wire F, protective circuit.SW-SW1, SW-SW2 is respectively two groups of rectification circuits, between the cross-over connection input.Rectifier filter A: sent into the rectifier bridge BR1 be attached thereto after foregoing circuit by AC1, AC2, rectifier bridge BR1 is by a high voltage VH+ of filter capacitor CP output; Rectifier filter B: sent into the rectifier bridge BR be attached thereto after foregoing circuit by AC1, AC2, BR by filter capacitor CH1, CH2 and resistance R A1, RA2 network after output voltage DV and DV1, capacitor C H3 and CH4 are for starting fast and filtering.

SEPIC converter circuit shown in Fig. 3, be connected to the rectifier filter A output voltage V H+ of Fig. 2 respectively drain electrode, input filter capacitor C3 and the inductance L 1 of resistance R 1, transistor T 1.Inductance L 1, power switch pipe QP, coupling capacitance C4 and C5, inductance L 2, rectifier diode D1, output filter capacitor C6 and C7, Technics of Power Electronic Conversion controller U1 form the SEPIC switching power circuit.The source electrode of transistor T 1 connects the VCC pin of controller U1, is controller U1 power supply, and controller is selected the integrated circuits such as LTC1871, LTC3803 of Linear company; Voltage VH+ connects the Ith/Run pin of U1 by resistance R 1, diode DZ1, capacitor C 1, resistance R 2, control the start-stop of controller U1; The source electrode of power switch pipe QP connects the non-essential resistance network, connects the Sense pin of controller U1 by resistance R S3 simultaneously, monitors switching current; The Ngate pin of U1 connects the grid of power switch pipe QP, output gate drive voltage driving power switch QP.Output voltage V P1 is connected to the Vfb pin of U1 through the resistance pressure-dividing network consisted of resistance R 4, R3, R3A, feedback signal is provided.SIN+ and SIN-are the output current sampling 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 _inat AC6.5-20V (DC8.0-30V has deducted rectifier bridge pressure drop 0.8V), can work, output voltage V _oconstant is DC14.5V, rated current I _ofor 2.0A.

Input and output voltage and duty ratio 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 rectifying schottky diode forward conduction voltage drop, D is switching tube working signal duty ratio.

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 value, I _{l1 (MAX)}, I _{l2 (MAX)}maximum current for inductance L 1 and L2.

When continuous operation mode, switching tube switching current expression formula is:

I _SW(MAX)=I _L1(MAX)+I _L2(MAX)

Switching tube peak 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 the SEPIC circuit, the parameter χ span of above formula is 0.2 to 0.4, gets the ripple current DI that χ=0.4 can obtain inductance here _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 value V _{iN (MIN)}, maximum functional duty ratio D _mAXwith ripple current DI _sW, can obtain the inductance expression formula of separate cores:

$\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="HDA0000379428960000032.png"\; state="\{\{state\}\}">L</figure-callout>}1=\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="HDA0000379428960000032.png,HDA0000379428960000041.png"\; state="\{\{state\}\}">L</figure-callout>}2=\frac{V_{\mathrm{IN}\left(\mathrm{MIN}\right)}}{0.5{\mathrm{\&Delta;I}}_{\mathrm{SW}}\&CenterDot;f_{\mathrm{OSC}}}\&CenterDot;D_{\mathrm{MAX}}$

SEPIC circuit in the present invention, the span of inductance is 1 μ H-100 μ H. when two inductance simultaneously around on a magnetic core time, gets L1=L2, the expression formula of inductance value is:

$L=\frac{V_{\mathrm{IN}\left(\mathrm{MIN}\right)}}{{\mathrm{\&Delta;I}}_{\mathrm{SW}}\&CenterDot;f_{\mathrm{OSC}}}\&CenterDot;D_{\mathrm{MAX}.}$

Current sampling as shown in Figure 4 and supervisory circuit, by the output of Fig. 3 by current resistor R _inbe converted to voltage V _sense=IR _s.Pass through input resistance R by electrical connection terminal SIN+ again _inafter be connected to current sense amplifier U5-the IN pin, electrical connection terminal SIN-be connected to current sense amplifier U5+the IN pin.The output voltage V out of U5 is calculated by following formula:

$V_{\mathrm{out}}=\frac{V_{\mathrm{sense}}\&CenterDot;R_L}{R_{\mathrm{in}}}=\frac{I\&CenterDot;R_S\&CenterDot;R_L}{R_{\mathrm{in}}}$

In above formula, I is for flowing through sample resistance R _selectric current, V _sensefor sample resistance R _sthe voltage at two ends, V _outvoltage for current sense chip U5 output.

Voltage VP1 obtains operating current threshold values reference voltage VCSA and VCSB by resistance pressure-dividing network and the three end adjustable shunt reference source TRE that consist of resistance R 25, R26, R27, R16, R17, R18 simultaneously.The in-phase end of comparator U6A connects the output of U5, and end of oppisite phase connects reference voltage VCSA; Comparator U6B end of oppisite phase connects the output of U5, and in-phase end connects reference voltage VCSB.When operating current reduces by 30% from rated value, but while not reaching 50%, the voltage of voltage comparator U6A output terminals A is low level, and the voltage of the output B of voltage comparator U6B is low level.When the operating current reduction meets and exceeds 50%, the voltage of voltage comparator U6A output terminals A is low level, and the voltage of U6B output B is high level.

As shown in Figure 5 be the window voltage comparison circuit.The resistance pressure-dividing network that the output voltage V P1 of Fig. 3 process is consisted of resistance R 5, R6, R7 and three end adjustable shunt reference source T2 obtain upper voltage limit value Vref1 and the lower voltage limit value Vref2 of window voltage comparison circuit.The supply power voltage that VP is the system supply load, by supply power voltage VP, by connecting the in-phase end of comparator U4 after resistance R 13, R14 dividing potential drop, lower voltage limit value Vref2 connects the end of oppisite phase of comparator U4.The output voltage DV1 of rectifier filter B in Fig. 1 is compared with upper voltage limit value Vref1 and lower voltage limit value Vref2 respectively, when voltage DV1 is greater than upper voltage limit value Vref1, the state of output L is not affected by supply power voltage VP state, and output L unconditionally exports high level; When 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 power voltage VP, if supply power voltage VP is when effectively being loaded work piece, output L is high level, if supply power voltage VP is that 0(is non-loaded) time, output L is low level; When DV1 is less than lower voltage limit value 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 the comparator U6A output in Fig. 4 current sampling and supervisory circuit, the comparator U6B output that B is Fig. 4, G is auxiliary magnet.When LED lamp spoilage reaches 30% but while not reaching 50%, A is low level, B is low level, and C is high level, and War is high level, connects buzzer BZ, and the output state of relay J K1 transfers " normally closed " to and to the Central Control Room output alarm signal from " often opening "; When LED lamp spoilage reaches 50%, A is low level, and B is high level, and 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 the output of comparator U6A and U6B in Fig. 4 current sampling and supervisory circuit.When the LED lamp works, the A end is high level, transistor T 8 conductings, and the power supply of VP1 end, by resistance R 30, is lighted normal indicator light Lok.Simultaneously, the Chang Kaiduan adhesive of relay J K1, the indicator light of connecting long-range Central Control Room shows normal operation; When the A end is low level, transistor T 8 turn-offs, and the voltage of VP1 end, by control winding and the resistance R 31 of relay J K1, is lighted malfunction indicator lamp Lerro.Simultaneously, the normally closed electric shock adhesive of relay J K1, send failure alarm signal to Central Control Room; The spark that the capacitor C L1 of relay J K1 output, CL2, resistance R L1 produce while being used for eliminating the electric shock break-make.

Output break-make control structure circuit as shown in Figure 8, L is the window voltage comparison circuit output shown in Fig. 5, G is the auxiliary magnet in logic processing circuit.When the LED spoilage lower than 50% the time, the B output low level, auxiliary magnet G is high level, switch transistor T 4 cut-offs, switch transistor T 3 conductings, keep between output L and load connecting, load still works on; When the LED spoilage reaches 50%, B exports high level, and auxiliary magnet G is low level, switch transistor T 4 conductings, and switch transistor T 3 cut-offs, be disconnected between output L and load.

Capacitive load compensation net circuit as shown in Figure 9, the output that C, J3 are logic processing circuit in Fig. 6, the output that A is comparator U6A in Fig. 4 current sampling and supervisory circuit, the capacitive compensation switching end that SW, SW1, SW2 are current rectifying and wave filtering circuit in Fig. 2.When the LED lamp is working properly, drop into first group of capacitive load compensation net (SW-SW1), increase electric current and make the Central Control Room current relay be enough to adhesive; When LED lamp spoilage reaches 30%, A is low level, and B is low level, and C is high level, and J3 is low level, relay J K3 action, and second group of capacitive load compensation net (SW-SW2) of switching, compensation reduces because the LED lamp damages the electric current caused; When LED lamp spoilage reaches 50%, A is low level, and B is high level, and C is low level, and JK3 is high level, and relay J K3 and JK2 disconnect, and by the excision of two groups of capacitive load compensation nets, electric current is reduced, and is enough to allow the 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; Whether the friendship of its input voltage observation circuit (directly) stream input is connected with the output of transformer for railway signal, for monitoring transformer for railway signal, have power supply to provide.Switch driving circuit is the grid of connecting valve pipe Q1, Q2 respectively, the drain electrode of switching tube Q1 is connected with ground wire with the output voltage DV of the second rectifier filter respectively with source terminal, and the drain electrode of switching tube Q2 is connected with ground wire with the supply power voltage VP in the window voltage comparator circuit respectively with source terminal.When transformer for railway signal has power supply to provide, switching tube Q1 and Q2 are all in cut-off state; When the moment that transformer for railway signal is stopped power supply to system, switching tube Q1 and Q2 all produce a transition process from " cut-off state " to " conducting state ", discharge fast the electric energy of DV and 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 for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement and distortion, these improvement and distortion also should be considered as protection scope of the present invention.

Claims (10)

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

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

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

In described the second rectifier filter, described first end AC1, the second end AC2 be with after rectifier bridge BR is connected, by output voltage DV and DV1 respectively 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 voltage V H+ is connected to respectively 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 the non-essential resistance network, connects the Sense pin of controller U1 by resistance R S3 simultaneously, monitors the power switch tube current; The Ngate pin of controller U1 connects the grid of power switch pipe QP, output gate drive voltage driving power switching tube QP; Output voltage V P1 is connected to the Vfb pin of controller U1 through the first resistance pressure-dividing network, feedback signal is provided; Two output current sampling points are set in described SEPIC converter circuit.

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

The output voltage V P1 of described SEPIC converter circuit being connected on a pin of the chip in described current sampling and supervisory circuit, is chip power supply; The output current of described SEPIC converter circuit is connected to respectively on two other pin of chip; The output voltage V P1 of described SEPIC converter circuit obtains reference voltage VCSA and VCSB by the second resistance pressure-dividing network and three end adjustable shunt reference source TRE simultaneously;

Also comprise two comparators in described current sampling and supervisory circuit, the in-phase end of the 6A comparator in two comparators, the end of oppisite phase of 6B comparator all are connected with the output of chip, the end of oppisite phase of 6A comparator 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.

5. 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 comparison circuit through the 3rd resistance pressure-dividing network in described window voltage comparison circuit and three end adjustable shunt reference source T2; To connect the input pin IN+ of the 4th comparator U4 after supply power voltage VP dividing potential drop, lower voltage limit value Vref2 connects another input pin IN-of the 4th comparator U4; The output voltage DV1 of described rectifier filter B is compared with upper voltage limit value Vref1 and lower voltage limit value Vref2 respectively, and when voltage DV1 is greater than upper voltage limit value Vref1, the state of output L is not affected by supply power voltage VP state, and output L exports high level; When 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 power voltage VP, if supply power voltage VP is when effectively being loaded work piece, output L exports high level, if supply power voltage VP is 0 while being non-loaded, output L output low level; When 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.

6. railway signal condition monitoring according to claim 4 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;

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

7. railway signal condition monitoring according to claim 6 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 grid of the transistor T 8 in described alarm condition output circuit, and the collector electrode of transistor T 8 is connected with relay J K1, described relay J K1 trigger alarm signal.

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

Described output on-off control circuit is connected with described window voltage comparison circuit, comprises a plurality of switching tubes that output L in described window voltage comparison circuit and auxiliary magnet are controlled conducting or cut-off in described output on-off control circuit;

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

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

9. railway signal condition monitoring according to claim 6 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; When the 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 current relay; When LED lamp spoilage reaches 30%, second group of capacitive load compensation net of switching, compensation reduces because the LED lamp damages the electric current caused; When LED lamp spoilage reaches 50%, excise two groups of capacitive load compensation nets, disconnect the current relay of Central Control Room; When overcurrent, under-voltage, open circuit conditions occurring, disconnect the current relay of Central Control Room, send alarm signal.

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

Describedly restart fast circuit, comprise input voltage observation circuit, switch driving circuit, the first switching tube and second switch pipe; The 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 ground wire with the output of the second rectifier filter respectively with source terminal, and the drain electrode of second switch pipe is connected with ground wire with the supply power voltage of system supply load respectively with source terminal; When the 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 all are transitioned into conducting state from cut-off state, and the voltage that system is remaining discharges fast.

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