JP2004114968A - Light emitting diode signal lamp and railway signal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize an LED signal lamp and a railway signal that can be used under the same voltage without performing resistor switching even under a series connection of two lamps and a single lamp. <P>SOLUTION: This LED signal lamp 50 comprises a fitting or disengaging unit having a fitting 21 replaced in a railway signal lamp and a connecting contact portion 22; an LED unit having a plurality of LEDs 52a and 52b connected in such a way that they can be driven concurrently; a rectifier circuit 31 inserted at an electrical power path extending from the connecting contact portion 22 to the LED; and current control circuits 51a and 51b for restricting the current in the electrical power path to an allowable range of the LEDs. In addition to LEDs, the current control circuit is also divided into two groups, and a series connection/parallel connection changing-over circuit 56 capable of changing-over whether or not the two groups are set in a series-connected state or a parallel-connected state is installed. When this is installed at a railway signal unit, the two groups are switched into a parallel-connected state in the series connected two lamps and the two groups of one lamp are switched to a series connection. With such an arrangement as above, all the light emitting signal lamps are lit and driven at a rated voltage. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an LED signal light bulb used as a signal light bulb for railways, and more particularly, to an LED signal light bulb that can replace a filament-type signal light bulb while configuring a light emitting unit with a large number of light emitting diodes. Such an LED signal light bulb is suitable for a railway signal light to which a railway I-shaped light bulb or the like can be attached.
In addition, the present invention relates to a railway traffic signal provided with a plurality of light boxes to which such signal light bulbs are mounted, and more specifically, a signal light bulb connected in series and a signal light bulb other than those are driven at the same voltage. The present invention relates to a railway traffic light. Such railroad traffic lights include railroad transit traffic lights and exchange traffic lights as well as exchange traffic signs.
[0002]
[Background technology]
5A and 5B show a general configuration of a relay traffic signal 10 which is an example of a railway traffic signal, where FIG. 5A is a front view of a signal light part as a main part, FIG. 5B is a circuit diagram thereof, and FIGS. () Is an explanatory diagram of a voltage application state. The relay signal device 10 (see FIG. 5A) is provided with a large number of light boxes to which a railway I-type signal bulb can be mounted, and the lighting thereof is controlled by a higher-level control device (not shown). In addition, (see FIG. 5B), among these light boxes, the light box 11 (first light box) and the light box 12 (second light box) are connected in series, and the series circuit is connected to, for example, a relay signal HR. The corresponding predetermined voltage Vin (the voltage between BX and CX) is applied or not applied. Further, among the remaining light boxes, the light box 13 is connected in series with the resistor 14 so that the same circuit Vin is applied / unapplied to the series circuit according to, for example, the relay signal HR or another signal. It has become.
[0003]
Then, when the voltage Vin is applied to the series circuit of the light boxes 11 and 12 (see FIG. 5C), both the divided voltage V1 of the light box 11 and the divided voltage V2 of the light box 12 are half (Vin / 2) of the voltage Vin. )become. The voltage (Vin / 2) is the rated voltage of the I-type signal bulb, and the signal bulb mounted on the light boxes 11 and 12 emits light properly when driven at that voltage (Vin / 2). Also, when the voltage Vin is applied to the series circuit of the light box 13 and the resistor 14 (see FIG. 5D), if the light box 13 is equipped with a filament type I-type signal bulb, the voltage of the light box 13 is reduced. Both the voltage V3 and the divided voltage Vr of the resistor 14 become half of the voltage Vin (Vin / 2). This is because the resistor 14 corresponds to such a filament type railway signal bulb. Specifically, the resistance value of the resistor 14 is almost the same as the resistance value of the filament at the time of light emission.
[0004]
[Prior art]
As a railway signal bulb mounted on the light boxes 11 to 13 described above, in addition to the filament type I-type signal bulb 20 (see FIG. 6A) which is a standard product, an LED signal bulb 30 ( A circuit diagram of FIG. 6B and Patent Document 1) and an LED signal light bulb 40 (see a block diagram of FIG. 6C and Patent Document 2) are also known.
More specifically, the signal light bulb 20 includes at least a pair of terminals 22 (connecting contact portions) supported by a base 21 and a filament 23 (light emitting portion) encapsulating a vitreous sphere. It can be attached to and detached from seats such as the light boxes 11 to 13 of the relay signal 10 in accordance with the above.
[0005]
The LED signal bulb 30 is provided with the above-described base 21 and the terminal 22 on the detachable portion for mounting compatibility, but the light emitting portion has a large number of LEDs (a plurality of light emitting diodes) instead of the filament 23. Is provided. The LED light emitting section 32 is a lighting circuit in which a large number of LEDs are connected in series and parallel and driven simultaneously. In addition, a transformer, a rectifier circuit 31, and a current limiting circuit 33 are interposed and connected to the power supply path from the terminals 22, 22 to the LED light emitting unit 32 in that order. The rectifier circuit 31 includes a diode stack or the like, and converts AC to DC. The current limiting circuit 33 is composed of a constant current diode or the like, and alleviates and attenuates the undesired effect of the supply current of the LED light emitting unit 32 due to the fluctuation of the applied voltage (Vin / 2) during lighting, thereby stabilizing the light emitting state. It is made to let.
[0006]
Like the LED signal bulb 30, the LED signal bulb 40 also includes the terminals 22, 22, a rectifying circuit 31, and an LED light emitting unit 32, but a smoothing circuit and a constant circuit are provided between the rectifying circuit 31 and the LED light emitting unit 32. A current control circuit 43 is provided. Also, a current presence / absence detection circuit 44 (detection means) for detecting the presence / absence of a current supplied from the smoothing circuit to the LED light emitting section 32, and a power supply amount for switching the amount of power supply to the terminals 22, 22 based on the detection result. A switching circuit 45 is also provided. When one of these LED signal bulbs 40 is turned off due to a disconnection failure when two lamps are used in series, the other is also turned off.
[0007]
[Patent Document 1]
Registered Utility Model Publication No. 3068502 (Page 1, FIG. 2)
[Patent Document 2]
JP-A-2002-173028 (page 1-2, FIG. 5)
[0008]
[Problems to be solved by the invention]
In such a conventional LED signal light bulb, compatibility with a filament type signal light bulb in terms of a mechanical structure and a driving voltage of a detachable portion is ensured, and a long life and a reduction in power consumption are achieved. Further, the latter LED signal light bulb provided with the detecting means and the electricity amount switching means is compatible with the filament type signal light bulb with respect to the property that both light are extinguished due to disconnection failure when used in series.
By the way, instead of obtaining the advantage of saving power consumption, compatibility is not maintained with respect to the current, and the current value of the LED signal bulb is reduced to about 1/10 of that of the filament type signal bulb. In other words, the equivalent resistance of the LED signal bulb does not correspond to a filament type railway signal bulb.
[0009]
For this reason, for example, when the LED signal bulb 30 or the LED signal bulb 40 is mounted on the light boxes 11 to 13 of the above-described relay signal device 10, for the light boxes 11 and 12 (see FIG. 5C), the LED signal of the light box 11 Although both the partial voltage V1 of the light bulb and the partial voltage V2 of the LED signal light bulb of the light box 12 have appropriate rated voltages (Vin / 2), for the light box 13 (see FIG. 5D), the partial voltage Vr of the resistor 14 Since the voltage becomes significantly smaller as the current decreases, the partial voltage V3 of the LED signal bulb of the light box 13 greatly exceeds the rated voltage, approaches the voltage Vin, and becomes undesired.
[0010]
As a straightforward measure to avoid this, the current of the LED signal light bulb must be compatible with the filament type signal light bulb, and the resistance value of the resistor connected in series with the light box in the railway signal light must be adjusted. It is conceivable to perform replacement for lowering.
However, the former current compatibility is a technique that costs and loses a significant advantage, and the latter resistance replacement requires time and effort to reduce the compatibility between railway traffic lights and filament type signal bulbs. This is a method of losing a copy, and there are difficulties in each case. It is not desirable to prepare two types of LED signal bulbs having different rated voltages, because this leads to an increase in cost and complicates production management and inventory management.
[0011]
Therefore, even if a plurality of LED signal bulbs of the same type are mounted on a railway traffic signal that drives a series connection circuit of a resistor corresponding to a filament-type signal bulb and a single lamp at the same voltage as two lamps in series, the railway traffic signal will still have a resistance. It is a technical problem to devise the configuration and the like of the LED signal bulb so that the LED signal bulb can be used as it is without replacement and the power consumption of the LED signal bulb can be kept low.
The present invention has been made in order to solve such a problem, and has realized an LED signal bulb and a railway signal which can be used at the same voltage without replacing a resistor in two lamps in series or one lamp alone. The purpose is to do.
[0012]
[Means for Solving the Problems]
The LED signal light bulb invented to solve such a problem is, as described in claim 1 at the beginning of the application, at least one pair of connection contacts in addition to a base detachable to a seat of a light box of a railway signal light. LED having a light emitting diode having a plurality of light emitting diodes connected so as to be able to be driven simultaneously, and a rectifying circuit inserted in a power supply path from the connection contact portion to the light emitting diode. In the signal light bulb, a connection for dividing the light emitting diodes into two groups is provided, and a series / parallel switching circuit capable of switching between the two groups in a series connection state or a parallel connection state is provided. That is.
[0013]
Further, as described in claim 2 at the beginning of the application, when a current control circuit that suppresses the current of the power supply line to an allowable range of the light emitting diode is also provided, the current control circuit includes two groups in addition to the light emitting diode. The two groups are set as switching targets of the series-parallel switching circuit.
Further, as described in claim 3 at the beginning of the application, a smoothing circuit is provided between the rectifier circuit and the light emitting diode, and a detecting means for detecting the presence or absence of a current supplied from the smoothing circuit to the light emitting diode. If there is also provided an energization amount switching means for switching the magnitude of the energization amount of the connection contact portion based on the detection result, the connection is made such that the detection means is divided into two groups in addition to the light emitting diodes. Are to be switched by the series-parallel switching circuit.
[0014]
In such an LED signal light bulb, if the series / parallel switching circuit is switched to the parallel side, the rated voltage is the same as the conventional one, so where the conventional LED signal light bulb can be used, use it as before. Can be. On the other hand, when the series / parallel switching circuit is switched to the series side, the rated voltage becomes about twice that of the parallel side. The current is the same as that of the conventional LED signal bulb at the parallel side, and only half of that at the series side, and in any case, is much smaller than that of the filament type railway signal bulb.
[0015]
Therefore, the first light box and the second light box, each of which can be equipped with a railway signal bulb, are connected in series, and the resistance corresponding to the filament type railway signal bulb is connected in series with the third light box. When they are mounted on a railway traffic light driven by the same voltage and used, the following is performed. That is, as described in claim 4 at the beginning of the application, for the LED signal bulbs mounted on the first light box and the second light box, the series / parallel switching circuit is switched to the parallel connection state, and the LED light bulb mounted on the third light box is mounted. For the LED signal bulb, the series / parallel switching circuit is switched to a series connection state. Then, since the voltage of the resistor is small and negligible under a small current, all the LED signal light bulbs are driven to be driven at the rated voltage without performing the resistance replacement of the railway traffic light.
[0016]
As described above, by switching between the two groups of LEDs inside the light bulb, it is possible to share the LED signal light bulb for lighting one light and for lighting two lights in series. In addition, the advantage of low power consumption is not impaired, and there is no undesired influence from the resistance corresponding to the filament type signal bulb associated with one lamp operation.
Therefore, according to the present invention, it is possible to realize an LED signal light bulb and a railway traffic signal that can be used at the same voltage without performing resistor replacement or the like with two lamps in series or one lamp alone.
[0017]
Further, when the two-group division and the serial / parallel switching are also applied to the current control circuit, the advantage that the influence of the fluctuation of the applied voltage on the LED with respect to the current is reduced or suppressed and the light emitting state is stabilized is maintained. You.
Furthermore, when the two-group division and the series / parallel switching are also applied to the detection means, the function of maintaining the function that when one of the two lamps is used in series and one of them is extinguished due to a disconnection failure and the other is extinguished. Since this function is added on the premise that there is a possibility of using two lamps in series, the practicability is further enhanced by also having this function.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Specific embodiments of the LED signal light bulb and the railway signal light of the present invention achieved by such a solution will be described with reference to the drawings. 1A and 1B show the structure of the LED signal light bulb 50, wherein FIG. 1A is a circuit diagram and FIG. FIG. 2 is a circuit diagram of a main part of the relay signal 10 (railway signal) to which the LED signal bulb 50 is mounted. In the drawings, the same components as those in the related art are denoted by the same reference numerals, and the description of the background art with reference to FIG. Since each embodiment is also common, duplicate explanations will be omitted, and the following description will focus on differences from the conventional example. That is, since the relay signal 10 has no change including the resistor 14, the modification points of the LED signal bulb 50 will be described in detail below.
[0019]
Like the conventional LED signal bulbs 30 and 40, the LED signal bulb 50 is provided with the base 21 and the terminal 22 described above in the detachable section for mounting compatibility, and supplies power to the LED (light emitting diode) of the light emitting section. For this reason, the rectifier circuit 31 is also inserted and connected to the power supply path. However, unlike the related art, the LED light emitting unit 32 (a plurality of light emitting diodes) is divided into two groups, an LED group 52a and an LED group 52b. And a series-parallel switching circuit 56 for switching the two groups into a series connection state or a parallel connection state. A circuit for suppressing the current flowing through the power supply path from the pair of terminals 22 to the LED groups 52a and 52b via the rectifier circuit 31 and the series / parallel switching circuit 56 to an allowable range of the LEDs is also a current control circuit for the LED group 52a. The circuit 51a and the current control circuit 51b related to the LED group 52b are provided separately.
[0020]
Each of the LED groups 52a and 52b includes a plurality of LEDs connected in series and parallel, and has the same number of LED stages as that of the LED light emitting unit 32 and the number of parallel LEDs is half of the LED light emitting unit 32. , So that they can be driven via a pair of power supply lines. Each of the feed lines leads to a series / parallel switching circuit 56, in which current control circuits 51a and 51b are interposed in the illustrated example. They may be grouped together with the groups 52a and 52b. The current control circuits 51a and 51b may be the same as the above-described current limiting circuit 33 of the LED signal bulb 30 and the constant current control circuit 43 of the LED signal bulb 40 as described later. Each control target current value is also halved.
[0021]
The series-parallel switching circuit 56 is mainly configured of, for example, two manually operated changeover switches. With the wiring, the power supply line coming out of the positive voltage output terminal (+) of the rectifier circuit 31 is used as it is as the positive voltage side power supply line of the current control circuit 51a and the LED group 52a, and is output from the negative voltage output terminal (-) of the rectifier circuit 31. In addition to using the supplied power line as it is as the negative voltage side power supply line of the current control circuit 51b and the LED group 52b, the switch connects the negative voltage side power supply line such as the LED group 52a and the positive voltage side power supply line such as the LED group 52b. Is switched.
[0022]
Specifically, one of the two switches has a movable piece constant connection terminal connected to the negative voltage supply line of the LED group 52a, and one contact connected to the positive voltage supply line of the LED group 52b, The other contact is connected to the movable piece constant connection terminal of the other switch. In the other switch, the movable piece constant connection terminal is also connected to the positive voltage supply line of the LED group 52b, one contact is connected to the positive voltage supply line of the LED group 52a, and the other contact is opened. ing.
Further, the dual switch operator 56a is mounted on the rear surface of the LED signal light bulb 50 so as to be partially exposed so that the switching operation can be easily performed.
[0023]
With respect to the LED signal light bulb 50 and the relay signal device 10, usage modes and operations thereof will be described. Here, the operation when the three LED signal bulbs 50 are mounted on the three light boxes 11 to 13 of the relay signal device 10 will be mainly described.
[0024]
When the LED signal bulb 50 is mounted on the light box 11, the dual switch operator 56a is manually operated to connect the negative voltage side power supply line of the LED group 52a to the negative voltage side power supply line of the LED group 52b, The positive voltage side power supply line of the LED group 52b is connected to the positive voltage side power supply line of the LED group 52a.
The same applies when the LED signal bulb 50 is mounted on the light box 12.
[0025]
On the other hand, when attaching the LED signal bulb 50 to the light box 13, the dual switch operator 56a is manually operated so that the negative voltage side power supply line of the LED group 52a is connected to the negative voltage side power supply line of the LED group 52b. The LED group 52b is connected to the positive voltage side power supply line of the LED group 52b, and the positive voltage side power supply line of the LED group 52b is separated from the positive voltage side power supply line of the LED group 52a.
Nothing is done with the resistor 14.
[0026]
Then, regardless of the operation of the dual switch operator 56a, the positive voltage output terminal of the rectifier circuit 31 is connected to the positive voltage side power supply line of the LED group 52a and the LED group 52b The negative voltage output terminal of the rectifier circuit 31 is connected to the negative voltage side power supply line, so that the LED groups 52a and 52b are connected in parallel in the LED signal bulb 50 mounted on the light box 11 and the LED signal bulb 50 mounted on the light box 12. The LED groups 52a and 52b are connected in series in the LED signal bulb 50 with the light box 13 attached.
[0027]
In this state, when the voltage Vin is applied to the series circuit of the light boxes 11 and 12, both the divided voltage V1 of the light box 11 and the divided voltage V2 of the light box 12 become half (Vin / 2) of the voltage Vin. Since the voltage (Vin / 2) is an appropriate voltage for both the LED groups 52a and 52b, the LED signal bulb 50 mounted on the light boxes 11 and 12 appropriately emits light. The current control circuits 51a and 51b also exhibit current control capability when the voltage is near (Vin / 2).
[0028]
Further, when the voltage Vin is applied to the series circuit of the light box 13 and the resistor 14, the current is about 1/20, unlike when the filament type signal bulb is mounted, so that the partial voltage Vr of the resistor 14 is very small. Value (approximately Vin / 40), the partial voltage V3 of the light box 13 becomes a value close to the total voltage Vin. Then, since the LED groups 52a and 52b are equally divided into the series LED groups 52a and 52b in the LED signal bulb 50 mounted on the light box 13, both the LED groups 52a and 52b can be appropriately divided under the vicinity of the appropriate voltage (approximately Vin / 2). It emits light. Further, such a slight difference in voltage is mitigated by the current control circuits 51a and 51b, and the currents of the LED groups 52a and 52b are maintained at the same level as under the proper voltage (Vin / 2). LED signal bulb 50 is also lit at an appropriate luminous intensity.
[0029]
Thus, in the LED signal light bulb 50 and the relay signal light 10, when the LED signal light bulb 50 is mounted on the relay signal light 10, when two lamps are connected in series, the LED groups 52a and 52b are arranged in parallel, and the same power supply voltage is used. In the case of a single lamp below, by setting the dual switch operator 56a so that the LED groups 52a and 52b are in series, the LED signal bulbs 50 having the same structure can be easily used properly. As a result, the compatibility of the LED signal light bulb with the filament type signal light bulb is further improved without impairing the advantages such as low power consumption.
[0030]
[First embodiment]
The LED signal bulb 50 whose circuit diagram is shown in FIG. 3 is different from that of the above-described embodiment in that a transformer TR is inserted and connected between the terminal 22 and the rectifier circuit 31 and its primary side. And a fuse FL is interposed and connected to the secondary side. With these additions, the LED signal bulb 50 has improved surge resistance and is practical.
[0031]
The rectifier circuit 31 employs a full-wave rectifier composed of a diode stack, and the current control circuits 51a and 51b employ a large number of constant current diodes as in the current limit circuit 33. 52a and 52b are distributed and incorporated.
Such an LED signal bulb 50 is obtained by applying the present invention to a conventional LED signal bulb 30 (see the circuit diagram of FIG. 6B and Patent Document 1).
[0032]
[Second embodiment]
The LED signal light bulb 50 whose circuit diagram is shown in FIG. 4 is different from that of the above-described embodiment in that a lightning arrester Ar and a fuse PTC are introduced to improve surge resistance and the like, and the terminals 22 and 22 and the third terminal Connected to the FG, a noise removal circuit 57 is added immediately thereafter, a current supply switching circuit 55 is provided on the primary side of the rectifier circuit 31, and the LED group 52a is connected in series and parallel. The current presence / absence detection circuit 54a, the smoothing circuit and the constant current control circuit 53a are provided between the switching circuit 56, and the current presence / absence detection circuit 54b is provided between the LED group 52b and the series / parallel switching circuit 56. A circuit and a constant current control circuit 53b are provided.
[0033]
Such an LED signal light bulb 50 is obtained by applying the present invention to the conventional LED signal light bulb 40 (see the circuit diagram of FIG. 6C and Patent Document 2), and includes a smoothing circuit and a constant current control. The circuits 53a and 53b have the same circuit configuration as the smoothing circuit and the constant current control circuit 43, respectively. However, the constant current control circuit portion of the smoothing circuit and the constant current control circuit 53a corresponds to the current control circuit 51a, and the constant current control of the smoothing circuit and the constant current control circuit 53b corresponds to the two divisions of the LED. The circuit portion corresponds to the current control circuit 51b.
[0034]
Similarly to the current presence / absence detection circuit 44, the current presence / absence detection circuit 54a includes a coil portion of the relay R1 inserted and connected to the power supply line of the LED group 52a, and the current presence / absence detection circuit 54b also has a coil portion of the relay R2. This is interposed and connected to the power supply line of the LED group 52b.
Further, similarly to the energization amount switching circuit 45, the energization amount switching circuit 55 basically includes an opening / closing circuit including an intermittent relay that repeats on / off by applying a voltage, and an AC operation type electromagnetic relay R3. The amount of current flowing from the terminals 22 and 22 to the rectifier circuit 31 is switched. The relays R1 and R2 are both excited when the current presence / absence detection circuit is divided into a plurality 54a and 54b. When one or both of the relays R1 and R2 are not energized, the amount of energization is made small.
[0035]
In such an LED signal light bulb 50, the amount of electricity to the rectifier circuit 31 is reduced by the electricity amount switching circuit 55 regardless of which side of the LED groups 52a and 52b is disconnected. 52b goes out together. In addition, the amount of current supplied to other LED signal bulbs 50 connected in series with the LED signal bulb 50 is simultaneously narrowed down. As a result, the function of the LED signal bulb 40 that one of the lamps is extinguished when one of the lamps is extinguished due to a disconnection failure when used in series is inherited by the LED signal bulb 50. Moreover, the series / parallel switching circuit 56 also has a function of switching the LED groups 52a and 52b in series and parallel.
[0036]
[Other]
In the above-described embodiment and each example, the series / parallel switching circuit 56 is configured by two manually operated switches. However, the embodiment of the series / parallel switching circuit 56 is not limited thereto. Alternatively, it is also possible to use a circuit configured by a semiconductor circuit using a transistor, an SSR, or the like, and automatically performing series-parallel switching based on the value of the input voltage.
In addition, although the energization amount switching circuit and the current presence / absence detection circuit are embodied by a relay circuit, the present invention is not limited to this, and those circuits may be configured by a semiconductor circuit. For example, the current presence / absence detection circuit is embodied by using a current-voltage conversion resistor, a switching transistor, and the like, and the energization amount switching circuit is a pulse generation circuit, a waveform shaping circuit using a diode or the like, a power transistor, an SSR, a triac, and the like. Of these, it may be embodied by using an appropriate device or another appropriate semiconductor element, IC, or the like.
Furthermore, the LED group 52a for light emission is not limited to a large number of series-parallel connections, but may be connected in series or only connected in parallel as long as they can be driven simultaneously and have sufficient light quantity. The same applies to the LED group 52b.
[0037]
【The invention's effect】
As is clear from the above description, in the LED signal light bulb and the railway traffic light of the present invention, the series switching of the two LEDs in the light bulb can be switched, so that all the LED signal light bulbs have the rated voltage. And the LED signal light bulb and the railway signal can be used at the same voltage without replacing the resistor with two lamps in series or one lamp alone. There is.
[Brief description of the drawings]
FIG. 1 shows the structure of an LED signal light bulb according to an embodiment of the present invention, wherein (a) is a circuit diagram and (b) is an external view.
FIG. 2 is a circuit diagram of a main part of a railway traffic signal.
FIG. 3 is a circuit diagram of a first embodiment of the LED signal light bulb of the present invention.
FIG. 4 is a circuit diagram of a second embodiment of the LED signal bulb of the present invention.
5A and 5B show a general configuration of a railway traffic signal, where FIG. 5A is a front view of a main part, FIG. 5B is a circuit diagram of a main part, and FIGS. .
6A and 6B show the configuration of a conventional signal light bulb, wherein FIG. 6A is a front view of a filament type I signal light bulb, FIG. 6B is a circuit diagram of an LED signal light bulb, and FIG. 6C is a circuit block of another LED signal light bulb. FIG.
[Explanation of symbols]
10. Relay signal (railway signal)
11, 12, 13 Light box (where signal bulbs are mounted)
14 Resistance (corresponds to filament type railway signal bulb)
20 signal bulbs (I-shaped signal bulbs, filament-type railway signal bulbs)
21 Base (removable part of light box to seat, I-shaped light bulb socket)
22 terminals (light box attachment / detachment part, contact part for connection)
23 filament (light emitting part)
30 LED signal bulb (I-type compatible railway signal bulb)
31 Rectifier circuit (diode stack, full-wave rectifier)
32 LED light emitting unit (lighting circuit, multiple light emitting diodes)
33 Current limiting circuit (constant current diode, current control circuit)
40 LED signal bulb (I-type compatible railway signal bulb)
43 Smoothing circuit and constant current control circuit (current control circuit)
44 Current detection circuit (detection means)
45 Current supply switching circuit (intermittent relay, pulse generation + switch circuit)
50 LED signal bulb (I-compatible railway signal bulb)
51a, 51b Current control circuit (current limiting circuit, constant current control circuit)
52a, 52b LED group (a plurality of light emitting diodes are divided into two groups)
53a, 53b Smoothing circuit and constant current control circuit
54a, 54b Current presence / absence detection circuit (detection means divided into two groups)
55 Current supply switching circuit (intermittent relay, pulse generation + switch circuit)
56 Series / parallel switching circuit
56a Double switch operator
57 Noise Removal Circuit

Claims (4)

An attachment / detachment portion having at least a pair of connection contact portions in addition to a base that can be attached / detached to a seat of a light box for a railway signal light, an LED light-emitting portion having a plurality of light-emitting diodes connected so as to be simultaneously driven, In an LED signal light bulb including a rectifier circuit interposed in a power supply path from a contact portion to the light emitting diode, a connection is made to divide the light emitting diode into two groups, and the two groups are connected in series. An LED signal light bulb provided with a series-parallel switching circuit capable of switching between a parallel connection state and a parallel connection state. An attachment / detachment portion having at least a pair of connection contact portions in addition to a base that can be attached / detached to a seat of a light box for a railway signal light, an LED light-emitting portion having a plurality of light-emitting diodes connected so as to be simultaneously driven, In an LED signal bulb including a rectifier circuit inserted in a power supply path from a contact portion to the light emitting diode, and a current control circuit for suppressing a current in the power supply path to an allowable range of the light emitting diode, In addition, the current control circuit is also connected so as to be divided into two groups, and a series-parallel switching circuit capable of switching the two groups into a series connection state or a parallel connection state is provided. Characteristic LED signal bulb. An attachment / detachment portion having at least a pair of connection contact portions in addition to a base that can be attached / detached to a seat of a light box for a railway signal light, an LED light-emitting portion having a plurality of light-emitting diodes connected so as to be simultaneously driven, A rectifier circuit inserted in a power supply path from the contact portion to the light emitting diode, a smoothing circuit provided between the rectifier circuit and the light emitting diode, and a supply current from the smoothing circuit to the light emitting diode. In an LED signal light bulb comprising: a detecting means for detecting the presence / absence, and an energizing amount switching means for switching a magnitude of an energizing amount of the connection contact portion based on the detection result, the detecting means includes two in addition to the light emitting diode. A series / parallel switching circuit is provided which is connected to be divided into groups and which can switch between the two groups in a series connection state or a parallel connection state. And LED signal light bulb, characterized in that are. In each case, a first light box and a second light box capable of mounting a railway signal bulb are connected in series, and a resistor corresponding to a filament type railway signal bulb is connected in series with a third light box. In a railway traffic light driven by the same voltage, the LED signal bulb according to any one of claims 1 to 3 is mounted on any of the first light box, the second light box, and the third light box. Each of the LED signal bulb mounted on the first light box and the LED signal bulb mounted on the second light box has its series / parallel switching circuit switched to the parallel connection state, and the LED mounted on the third light box. A signal light for railways, wherein the signal light bulb has its series / parallel switching circuit switched to a series connection state.

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