CN100581308C - Electrical circuit for LED signal lamp with switching threshold - Google Patents
Electrical circuit for LED signal lamp with switching threshold Download PDFInfo
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- CN100581308C CN100581308C CN200610148497A CN200610148497A CN100581308C CN 100581308 C CN100581308 C CN 100581308C CN 200610148497 A CN200610148497 A CN 200610148497A CN 200610148497 A CN200610148497 A CN 200610148497A CN 100581308 C CN100581308 C CN 100581308C
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- 230000005669 field effect Effects 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 10
- 230000006978 adaptation Effects 0.000 abstract 1
- 239000003550 marker Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004438 eyesight Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
- B61L5/12—Visible signals
- B61L5/18—Light signals; Mechanisms associated therewith, e.g. blinders
- B61L5/1809—Daylight signals
- B61L5/1881—Wiring diagrams for power supply, control or testing
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/357—Driver circuits specially adapted for retrofit LED light sources
- H05B45/3574—Emulating the electrical or functional characteristics of incandescent lamps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L2207/00—Features of light signals
- B61L2207/02—Features of light signals using light-emitting diodes [LEDs]
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Abstract
An electrical circuit for operating a signal lamp, with a signal lamp comprising at least one light emitting diode, with a voltage input for supplying the electrical circuit with AC voltage, and with a diode connected in series with the voltage input, is characterized in that the electrical circuit comprises a first subcircuit connecting the cathode of the diode with the signal lamp, that the electrical circuit comprises a second subcircuit providing a low resistance current path in parallel to the signal lamp, as compared to the signal lamp, when the AC voltage is below a first critical level, that the electrical current comprises a third subcircuit disabling the low resistance current path in parallel to the signal lamp, as compared to the signal lamp, when the AC voltage is above the first critical level, and that the electrical circuit comprises a fourth subcircuit providing a low resistance connection from cathode of the diode to the signal lamp, as compared to the first subcircuit, when the AC voltage is above a second critical level. The inventive electrical circuit allows an adaptation of the luminous intensity by varying the AC input voltage.
Description
Technical field
The present invention relates to be used for circuit that signal lamp is operated, it has: signal lamp, and it comprises at least one light-emitting diode; The voltage input, it is used to this circuit that AC (interchange) is provided voltage; And diode, it is connected with this voltage input.
Background technology
From US2005/0151665A1, can understand such circuit.
Signal lamp is used for various fields, during particularly traffic is used.Railway signal particularly importantly.These signal lamps are used for showing that to the engine driver can enter the railroad track that is about to occur safely partly (switches such as track).
By day, the light of railway signal lamp must be enough bright, so that the state of engine driver's marker lamp before arriving this signal lamp.Yet during night, the luminous intensity of this signal lamp must be enough low, makes that the engine driver can dim eyesight.This just means the luminous intensity that should adjust railway signal lamp in one day stroke.
Railway signal lamp of the prior art typically uses the luminous element of common bulb as them.In order to adjust the luminous intensity of these bulbs, the ac input voltage of railway signal lamp is revised by railway control centre.During night, bulb be operated in daytime during the voltage that uses compare and be reduced to about 66% voltage place.Between the lights and in the morning, correspondingly switch this input voltage, so that carry out this day/night adjustment.
Recently, railway signal lamp has been equipped power led (LED) luminous element as them.It is more reliable more and cost is effective than common bulb that power LED has been proved to be.
Yet the characteristic of LED is very different with the characteristic of bulb, particularly with regard to considering the correlation between input voltage and the luminous intensity.When replacing common bulb with LED in railway signal lamp, railway control centre place is used for that to adjust the existing equipment of luminous intensity just no longer suitable by changing input voltage.
In the prior art, according to the needs of LED, the LED signal lamp with variable luminous intensity is equipped with the particular power source with variable current.
US2005/0151665A1 has described a kind of signal controlling device equipment of the LED of being used for signal lamp, and it has the transducer that is used to detect external light load; And Switching power.According to the control signal that is generated by this transducer, electric-control system is adjusted the LED electric current, thereby and has adjusted the luminous intensity of LED.
Sort signal control device equipment is incompatible with adjusting luminous intensity by the change ac input voltage.Therefore, when renewal has the existing railway signal of LED, in the prior art, must upgrade this railway control centre, and its luminous intensity control system.This is quite expensive and trouble.
Summary of the invention
Therefore, the objective of the invention is to realize day/night adjustment to the luminous intensity of LED-based signal lamp by changing ac input voltage.Especially, the objective of the invention is to make and to use existing luminous intensity control system (applying the variable input voltage that is suitable for based on the signal lamp of bulb) in conjunction with LED-based signal lamp.
According to the present invention, by as starting described circuit, can reach this purpose at specification, this circuit is characterised in that it comprises:
First electronic circuit, its negative electrode with this diode is connected with this signal lamp;
Second electronic circuit, when this AC voltage was lower than first critical level, this second electronic circuit provides to compare with this signal lamp had more low-resistance current path in parallel with this signal lamp;
The 3rd electronic circuit, when this AC circuit was higher than first critical level, the 3rd electronic circuit forbidding is compared with this signal lamp had more low-resistance current path in parallel with this signal lamp;
The 4th electronic circuit, when this AC circuit was higher than second critical level, the 4th electronic circuit provides to compare with this first electronic circuit to have more low-resistance negative electrode being connected to this signal lamp from this diode.
When switching input voltage, circuit of the present invention has been simulated a kind of characteristic of the signal lamp based on bulb together with its LED-based signal lamp.Especially, circuit design of the present invention is in the operation of the different voltages place of this voltage input.That is, at the first operating voltage place (between first critical level and second critical level), this circuit makes can carry out nighttime operation with the low luminous intensity of LED-based signal lamp.At the second operating voltage place (being higher than second critical level), this signal lamp makes can carry out day time operation with the high luminous intensity of LED-based signal lamp.
As long as AC voltage is lower than first critical level, this situation appears when having undesirable interference voltage usually, and all electric currents all are redirected to via second electronic circuit, and this signal lamp is not luminous.When AC voltage was higher than first critical level but is lower than second critical level, this signal lamp was powered via first electronic circuit.The assembly of first electronic circuit defines at this obtainable electric current in signal lamp place.When AC voltage was higher than second critical level, this signal lamp was powered by the 4th electronic circuit.This first electronic circuit can be left in the basket or be disabled subsequently.Therefore, generally speaking, the switching threshold place that is distributed between the loading resistor of input current in LED and circuit of the present invention changes.By selecting loading resistor carefully, circuit of the present invention has the characteristic of common bulb in its voltage input.Especially, only just can simulate the voltage/current characteristic of common bulb, obtain continuous basically characteristic with a spot of step.
For the purpose of upgrading, the circuit of the present invention of circuit of the present invention or a plurality of parallel connections can replace the bulb of existing railway signal or other signals such as traffic light signal.
In the preferred embodiment of circuit of the present invention, first electronic circuit comprises: power supply transistor, its collector electrode or emitter and first resistor in series; And second resistor, its transistorized base stage of will powering is connected with this signal lamp.By power supply transistor and the resistor that is connected to base stage, low current can be used for nighttime operation.When being higher than second critical level, can easily forbid first electronic circuit by with base stage identical voltage being set for the transistorized emitter of described power supply.
In another preferred embodiment, second electronic circuit comprises: shunting transistor, and its collector electrode or emitter are connected to signal lamp via at least one resistor, and wherein the base stage of shunting transistor is connected to the negative electrode of diode via another resistor.Enough voltage can be set by the base stage place at this shunting transistor to be activated via this at least one resistor and this shunting transistor low resistance current path in parallel with signal lamp.This resistor that connects this shunting transistor base stage and this diode cathode should be chosen as and make just in time at signal lamp because interference voltage and at the base stage place enough voltage was set before can be luminous.In addition, by turn-offing the voltage at base stage place, can easily forbid this shunting transistor.
In further preferred embodiment, the 3rd electronic circuit comprises disable transistor, wherein the base stage of this disable transistor is tapped between the resistor of two series connection, the resistor of these two series connection is connected the negative electrode of diode and the electrode of input voltage, and the electrode of this input voltage is free of attachment to this diode.Thereby the resistance of these two series connection is as voltage divider and can easily select first critical level.This disable transistor can easily be cooperated with second electronic circuit.
In the further developing of preceding two kinds of preferred embodiments, the collector electrode of disable transistor or emitter are connected to the base stage of shunting transistor.When the disable transistor conducting, shunting transistor has lost the voltage and the no longer conducting of shunting transistor at its base stage place.
The highly preferred embodiment of circuit of the present invention is characterised in that the 4th electronic circuit comprises: reference element, and it has output, control input and low resistance input; Wherein the output of reference element is via the 3rd resistance and the 4th resistance negative electrode that is connected to diode of series connection; Wherein when this AC voltage was higher than second critical level, the output of reference element was connected to the low resistance input of this reference element; And this embodiment is characterised in that the 4th electronic circuit also comprises: field-effect transistor, and it connects negative electrode and this signal lamp of diode, and wherein the grid of this field-effect transistor is tapped between the 3rd resistance and the 4th resistance.This field-effect transistor is provided to the low resistance current path of signal lamp.When reference element was the given enough voltage of the grid of field-effect transistor, this path was activated.Therefore, reference element and control the input assembly determined second critical level.Generally speaking, this embodiment can easily switch low resistance current path and easily determine critical level.
In the further developing of this embodiment, the 4th electronic circuit also comprises capacitor, and it connects the base stage of diode and the grid of field-effect transistor.This capacitor makes the voltage at grid place level and smooth,, as long as reload this capacitor after each cycle, just keeps field-effect transistor all conductings on the whole cycle of the AC of voltage input voltage that is.
In particularly preferred embodiment, signal lamp comprises at least 4 LED on the current path that is distributed at least two parallel connections, and especially, wherein at least two LED connect in each current path.The current path of every parallel connection is independent of the current path of another parallel connection and works, and therefore the fault of a LED can not influence the LED on another current path.LED connected make and under the situation that adopts same equipment, to use higher voltage and more LED.
Also comprise a kind of signal lamp device in the scope of the present invention, it has: aforesaid at least the first circuit and second circuit at least; Be used for the common electric voltage input of these circuit, wherein compare with this at least one second circuit, the polarity of this at least one first circuit on the electrode of common electric voltage input is opposite.Feasible two half-waves that can use AC voltage of this device.As a result of, on the whole cycle of this AC voltage, the LED of first circuit or second circuit luminous, has avoided flicker all the time.Select the sum of parallel circuits and the LED number of each circuit at required LED availability when LED of each circuit (its maximum) and acceptable design cost (its all LED in lucky two circuit have opposite polarity chron maximum).Select the sum of LED corresponding to the required maximum emission intensity of this signal lamp device.
In addition, as mentioned above, comprise the purposes of signal lamp device within the scope of the invention, wherein this signal lamp device is used as railway signal or is used as traffic light signal.
Can extract more advantage according to specification and accompanying drawing.Can jointly use above-mentioned and following characteristics individually or with any combination according to the present invention.Mentioned embodiment should not be construed as exhaustive, is used to describe illustrative properties of the present invention and be interpreted as having.
Description of drawings
The present invention has been shown in the accompanying drawing.
Fig. 1 shows the schematic circuit of the signal lamp device of the present invention that comprises two circuit of the present invention;
Fig. 2 shows the schematic circuit of the reference unit among Fig. 1;
Fig. 3 shows and illustrates that by day the parameter of circuit of the present invention is as the diagrammatic sketch of the function of time during the operator scheme.
Embodiment
Fig. 1 shows the schematic circuit of the signal lamp device of the present invention that comprises two circuit 1,21 of the present invention.Circuit 1,21 polarity are parallel to common electric voltage input V1 on the contrary.It is the sinusoidal pattern alternating current (AC) of about 6V to 12V (crest voltage) that voltage input V1 provides voltage.Utilize this voltage, can control luminous intensity.For simplicity, only the operation of last circuit 1 is elaborated; Yet following circuit 21 moves in the same manner with second half ripple of AC voltage.The reference marker of circuit 21 is corresponding to the reference marker of the circuit 1 of numeral little 20 (be in the circuit 1 resistance R 3 corresponding to the R23 in the circuit 21).
The diode D1 that is connected in series to the bottom electrode 2 of voltage input V1 is used as direction rectifier.The top electrode 3 of the negative electrode 4 of this diode D1 and this voltage input V1 provides power supply for circuit 1.
Generally the low-voltage of voltage being imported the V1 place via first electronic circuit 11 that comprises power supply transistor Q3 and resistor R 1, R2 offers signal lamp input 6.Causing a certain electric current corresponding to the voltage between the base stage of the negative electrode 4 of the diode D1 of the emitter of Q3 and Q3, this electric current is in order to flow through R2 and generally to be provided for the electric current of signal lamp input 6.
When the input voltage at the V1 place is lower than 1V, this signal lamp 5 will be not luminous fully.For this reason, what not needing to pay makes great efforts just to make signal lamp 5 and LED D3-D6 thereof away from such voltage.
The input voltage that is higher than 1V can make signal lamp 5 luminous, and therefore need handle this situation.Comprise that reference number is 12a, second electronic circuit of two parts of 12b comprises shunting transistor Q1 and is connected to the resistor R 11 of its base stage.When this AC voltage is higher than 1V, at the R11 place with at the base stage place of Q1 enough voltage is set, make Q1 become conducting.The resistor R 6, R7 that is parallel to the current path of signal lamp 5 provides to compare with signal lamp 5 together with Q1 has more low-resistance current path.The electric current that flows through resistor R 2 only flows through R6, R7 and Q1 subsequently, and (or negligible small amount of current is only arranged) do not flow through signal lamp 5.As a result, this signal lamp is not luminous.
Be higher than the input voltage place that is approximately first critical level of 6V at this, these signal lamp 5 expections can be luminous with its nighttime mode.First electronic circuit 11 provides a certain electric current to signal lamp 5, and wherein this electric current is determined by resistor R 2 basically.The flow through resistor R 1 of part electric current of power supply transistor Q3 of reception is used for the characteristic of signal lamp 5 is adjusted into the characteristic of bulb.In this night mode, the second electronic circuit 12a, 12b are necessary for non-activation.
This is carried out by the 3rd electronic circuit, and the 3rd electronic circuit comprises disable transistor Q2 and two resistor R 12, R13.When the AC voltage at negative electrode 4 places was higher than first critical value that is approximately 6V, the voltage at the base stage place of transistor Q2 was high enough to make disable transistor Q2 conducting.As a result of, the voltage at shunting transistor Q1 base stage place descends, and the Q1 blocking-up.Subsequently, no longer available via the low resistance current path of resistor R 6, R7 and Q1, and also will be through the LED D3-D6 of signal lamp 5 through the electric current of R2.Nighttime operation condition that Here it is.
When the AC voltage at negative electrode 4 places was higher than second critical value that is approximately 10V, luminous intensity should strengthen significantly so that carry out day time operation.This is to realize by the new low resistance current path of setting up from negative electrode 4 to signal lamp 5 the input 6, and this new low resistance current path is connected to compare with the power supply of first current path 11 and has lower resistance.This new low resistance current path makes that higher relatively electric current can flow through signal lamp 5.
This new low resistance current path comprises field-effect transistor (FET) M1, marks as Fig. 1, and it is the part of the 4th electronic circuit 14.This FET M1 connects negative electrode 4 and the signal lamp input 6 of diode D1.Has only when being provided with enough voltage just conducting of this FET M1 at grid 15 places.This enough voltage can be provided with by reference element U1.Reference element U1 has control input 16a, low resistance input 16b and output 16c.Low resistance input 16b is directly connected to the electrode 3 of voltage input V1, and control input 16a is via being connected to described electrode 3 with capacitor C2 parallel resistor device R10.Output 16c is connected to grid 15 via diode D2 and resistor R 5.
If the voltage at control input 16a place is enough high, then low resistance input 16b is connected in reference element U1 with output 16c, and grid 15 obtains enough voltage so that FET M1 conducting.Otherwise,, do not connect and also have high resistance thereby then export 16c if promptly the voltage at control input 16a place is lower.With resistor R 9, R10 and capacitor C2 is when being chosen as negative electrode 4 places that the switching that makes among the reference element U1 occurs in diode D1 and having the second critical voltage level just.
Only during a bit of time interval of a complete AC voltage cycle, promptly near the voltage peak of a half period, at grid 15 places enough voltage is set by reference element U1.In order to make signal lamp keep luminous (as long as promptly electric current process diode D1) during the whole half period of AC voltage, capacitor C1 makes the voltage at grid 15 places level and smooth.Though capacitor C1 is via resistor R 8 discharges.Being sized to of C1, R8 made during the complete cycle of AC voltage, the voltage at grid 15 places remained be high enough to make FET M1 to keep conducting, but can not make the voltage at C1 place be refreshed (charging) by reference element U1 in the next cycle or in several other cycle again, FET M1 blocks once more.
As long as FET M1 conducting, emitter and the voltage between its base stage of power supply transistor Q3 just descend, and do not have base current, and this power supply transistor Q3 closes.Subsequently, only be provided to the electric current of signal lamp 5 via FETM1.
Because used the different electric current supplies path of signal lamp 5 by day during operating condition and the nighttime operation condition, so such two paths can design independently.As a result of, can be independently and the luminous intensity (and near these target voltages characteristic) of this signal lamp 5 at two target voltage places is set with the scope of broad.For day time operation, the target voltage of 12V is typical to railway applications.For nighttime operation, daytime voltage about 66%, promptly 8V is typical.According to the present invention, during night, luminous intensity can be reduced to 0.2% of luminous intensity on this on daytime.Can utilize circuit of the present invention, easily realize this point by correspondingly selecting resistor R 2 and R1.
As the advantage of shown embodiment, on the one hand input voltage is compared with second critical value at reference element U1 place, and on the other hand during at least one cycle of AC voltage the state to the 4th electronic circuit C1 carry out record, the two separates.This just feasible second critical value that can limit the U1 place very exactly with the accuracy of about 1%-2%.The time of staying at the output 16c place that this also makes at U1 has the excursion of broad, particularly has the possibility of the quick switching from the day mode of operation to the nighttime mode.
According to the present invention, 17 circuit that signal can comprise 17 circuit of the positive half wave that for example is used for AC voltage and be used for negative half-wave.For example the complete signalling arrangement of railway signal and so on then comprises 136 LED altogether.
Fig. 2 shows the circuit diagram of reference element U1, can be as the part of inventive circuit 1 shown in Figure 1 as it.To control input 16a and low resistance input 16b feed-in operational amplifier, and output 16c is connected to transistorized collector electrode.This transistorized base stage is connected to the output of operational amplifier.
Fig. 3 has illustrated (time shaft t to the right) in three cycles of AC voltage during the operator scheme by day a plurality of parameters the circuit 1 of Fig. 1 in (make progress spool), and AC voltage is approximately 12V (at the peak value place) here.
Top figure has illustrated voltage U (4) (see figure 1) at negative electrode 4 places of diode D1.Have only positive half wave to pass through diode D1.In order to determine direction, marked second critical level (equaling scl).Here the scl level is approximately 10V.Voltage U (4) is higher than near the scl the voltage peak.
Second figure (from beginning number) illustrated the output resistance R (16c) of the output 16c of reference element U1.Just in time when U (4) has reached this scl, switch to low resistance input 16a owing to will export 16c, resistance R (16c) descends.And the like, when U4 drops to scl when following once more, R (16c) rises once more.
The 3rd figure illustrated the voltage U (15) at grid 15 places of FET M1, and its voltage with capacitor C1 place is identical.As long as R (16c) descends (and U (4) reaches scl simultaneously), the charging of capacitor C1 will begin.The time constant of this loading procedure is τ=R5C1.As long as R (16c) raises once more, C1 just begins discharge with another (longer) timeconstant=R8C1.In order to determine direction, marked the threshold voltage of the FET M1 of sM1 by name.On one-period, promptly when charging, U (15) remains on more than the sM1 fully next time.
The 4th figure represents to drain to it from the source electrode of FET M1, i.e. the voltage U (M1) of input 6 from negative electrode 4 to signal lamp.In the beginning of period 1, voltage U (M1) increases simultaneously with U (4).Yet as U (15) when reaching sM1, this FET M1 becomes conducting, and U (M1) drops to low level.During the negative half-wave of this ac input voltage, voltage (zero level) does not appear at the M1 place.At positive half wave time durations after a while, because U (15) remains on more than the sM1, so U (M1) is positioned at the low level place.Be positioned at the time durations of its low level place (but non-vanishing level) at U (M1), this signal lamp 5 is luminous brightly with day mode.
Claims (10)
1. be used for circuit (1,21) that signal lamp (5) is operated, it has:
Signal lamp (5), it comprises at least one light-emitting diode (D3, D4, D5, D6);
Voltage input (V1), it is used to described circuit (1,21) that AC is provided voltage; And diode (D1), it is imported (V1) with described voltage and connects,
Described circuit (1,21) is characterised in that it comprises:
First electronic circuit (11, Q3, R1, R2), its negative electrode with described diode (D1) (4) is connected with described signal lamp (5);
Second electronic circuit (12a, 12b, R11, Q1, R6, R7), when described AC voltage was lower than first critical level, described second electronic circuit (12a, 12b, R11, Q1, R6, R7) provides to compare with described signal lamp (5) had more low-resistance and described signal lamp (5) current path in parallel (R6, R7, Q1);
The 3rd electronic circuit (13, R12, R13, Q2), when described AC voltage was higher than described first critical level, compared with described signal lamp (5) described the 3rd electronic circuit (13, R12, R13, Q2) have more low-resistance and described signal lamp (5) current path in parallel (R6, R7, Q1) by forbidding;
The 4th electronic circuit (14, M1, C1, R8, R5, D2, U1, R9, R10, C2), when described AC voltage was higher than second critical level (scl), described the 4th electronic circuit (14, M1, C1, R8, R5, D2, U1, R9, R10, C2) provides to compare with described first electronic circuit (11, Q3, R1, R2) had be connected (M1, R3, the R4) of more low-resistance negative electrode from described diode (D1) (4) to described signal lamp (5).
2. circuit according to claim 1 (1,21) is characterized in that described first electronic circuit (11, Q3, R1, R2) comprising:
Power supply transistor (Q3), its collector electrode or emitter are connected with first resistor (R1); And
Second resistor (R2), its base stage with described power supply transistor (Q3) is connected with described signal lamp (5).
3. circuit according to claim 1 (1,21) is characterized in that described second electronic circuit (12a, 12b, R11, Q1, R6, R7) comprising:
Shunting transistor (Q1), its collector electrode or emitter are connected to described signal lamp (5) via at least one resistor (R6, R7), and the base stage of wherein said shunting transistor (Q1) is connected to the negative electrode (4) of described diode (D1) via another resistor (R11).
4. circuit according to claim 1 (1,21) is characterized in that described the 3rd electronic circuit (13, R12, R13, Q2) comprising:
Disable transistor (Q2), the base stage of wherein said disable transistor (Q2) is tapped between the resistor (R12, R13) of two series connection, the resistor of these two series connection (R12, R13) is connected the negative electrode (4) of described diode (D1) and the electrode (3) of described voltage input (V1), and the electrode (3) of described voltage input (V1) is free of attachment to the anode of described diode (D1).
5. circuit according to claim 3 (1,21) is characterized in that described the 3rd electronic circuit (13, R12, R13, Q2) comprises disable transistor (Q2), wherein:
The base stage of described disable transistor (Q2) is tapped between the resistor (R12, R13) of two series connection, the resistor of these two series connection (R12, R13) is connected the negative electrode (4) of described diode (D1) and the electrode (3) of described voltage input (V1), and the electrode (3) of described voltage input (V1) is free of attachment to the anode of described diode (D1); And
The collector electrode of described disable transistor (Q2) or emitter are connected to the base stage of described shunting transistor (Q1).
6. circuit according to claim 1 (1,21) is characterized in that described the 4th electronic circuit (14, M1, C1, R8, R5, D2, U1, R9, R10, C2) comprising:
Reference element (U1), it has output (16c), control input (16a) and low resistance input (16b), the negative electrode (4) that the output (16c) of wherein said reference element (U1) is connected to described diode (D1) via the 3rd resistance (R8) of connecting and the 4th resistance (R5);
Wherein when described AC voltage was higher than described second critical level (scl), the output (16c) of described reference element (U1) was connected to the low resistance input (16b) of described reference element (U1);
And described circuit (1,21) is characterised in that described the 4th electronic circuit (14, M1, C1, R8, R5, D2, U1, R9, R10, C2) also comprises:
Field-effect transistor (M1), its source electrode or drain electrode connect the negative electrode (4) and the described signal lamp (5) of described diode (D1), and the grid (15) of wherein said field-effect transistor (M1) is tapped between described the 3rd resistance (R8) and described the 4th resistance (R5),
Wherein said reference element (U1) is used for locating enough voltage is set at the grid (15) of described field-effect transistor (M1), so that make described field-effect transistor (M1) conducting.
7. circuit according to claim 6 (1,21), it is characterized in that described the 4th circuit (14, M1, C1, R8, R5, D2, U1, R9, R10, C2) also comprises capacitor (C1), it connects the negative electrode (4) of described diode (D1) and the grid (15) of described field-effect transistor (M1).
8. circuit according to claim 1 (1,21) is characterized in that:
Described signal lamp (5) comprises at least 4 LED (D3, D4, D5, D6) on the current path that is distributed at least two parallel connections, and especially, wherein at least two LED (D3, D4, D5, D6) connect in every current path.
9. signal lamp device, it has:
At least the first circuit according to claim 1 (1) and second circuit (21) at least;
Be used for the common electric voltage input (V1) of described circuit (1,21), wherein compare with described at least one second circuit (21), the polarity that described at least one first circuit (1) is imported at described common electric voltage on the electrode (2,3) of (V1) is opposite.
10. the purposes of a signal lamp device wherein is used as railway signal or traffic light signal with signal lamp device according to claim 9.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP05292461A EP1787886B1 (en) | 2005-11-18 | 2005-11-18 | Electrical circuit for an LED signal lamp with a switching threshold for switching between a daylight operation mode and a nighttime operation mode |
| EP05292461.0 | 2005-11-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1968554A CN1968554A (en) | 2007-05-23 |
| CN100581308C true CN100581308C (en) | 2010-01-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200610148497A Expired - Fee Related CN100581308C (en) | 2005-11-18 | 2006-11-17 | Electrical circuit for LED signal lamp with switching threshold |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1787886B1 (en) |
| CN (1) | CN100581308C (en) |
| AT (1) | ATE382530T1 (en) |
| DE (1) | DE602005004167T2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008025187A1 (en) * | 2008-05-23 | 2009-12-03 | Siemens Aktiengesellschaft | Signal transmitter for a LED light signal |
| DE102008029725A1 (en) * | 2008-06-23 | 2010-01-07 | Siemens Aktiengesellschaft | signaler |
| RS52884B (en) | 2010-10-15 | 2014-02-28 | Thales Deutschland Gmbh | Led signal lamp with constant current operation |
| EP2463174B1 (en) * | 2010-12-09 | 2013-10-30 | Siemens Schweiz AG | Method and device for replacing a bulb of a light signal |
| WO2013045867A1 (en) * | 2011-09-29 | 2013-04-04 | The Howells Group Plc | Railway light signals |
| US10104730B2 (en) * | 2017-03-07 | 2018-10-16 | B/E Aerospace, Inc. | LED bulb and method for operating same |
| CN116437201B (en) * | 2023-06-13 | 2023-10-10 | 深圳比特微电子科技有限公司 | Method and device for preventing continuous light and shade vibration of camera and camera system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE59406833D1 (en) * | 1993-11-05 | 1998-10-08 | Siemens Schweiz Ag | CIRCUIT ARRANGEMENT FOR RAILWAY LIGHT SIGNALING SYSTEMS |
| DE19846753A1 (en) * | 1998-10-07 | 2000-04-13 | Siemens Ag | Circuit arrangement for operating a light sign |
| GB2383180B (en) * | 2001-12-11 | 2005-05-04 | Westinghouse Brake & Signal | Signal lamps and apparatus |
| DE10164561B4 (en) * | 2001-12-14 | 2004-03-04 | Siemens Ag | Circuit arrangement for operating an LED signal |
| DE10221573B4 (en) * | 2002-05-08 | 2004-03-18 | Siemens Ag | Circuit arrangement for operating a light sign |
-
2005
- 2005-11-18 EP EP05292461A patent/EP1787886B1/en not_active Not-in-force
- 2005-11-18 DE DE602005004167T patent/DE602005004167T2/en active Active
- 2005-11-18 AT AT05292461T patent/ATE382530T1/en not_active IP Right Cessation
-
2006
- 2006-11-17 CN CN200610148497A patent/CN100581308C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP1787886A1 (en) | 2007-05-23 |
| DE602005004167D1 (en) | 2008-02-14 |
| ATE382530T1 (en) | 2008-01-15 |
| CN1968554A (en) | 2007-05-23 |
| DE602005004167T2 (en) | 2008-12-24 |
| EP1787886B1 (en) | 2008-01-02 |
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