JP5067547B2 - Load control device and indicator light - Google Patents

Description

  The present invention relates to a load control device that can cope with different current values by switching the secondary winding side of a current transformer, and a marker lamp equipped with the load control device.

  2. Description of the Related Art Conventionally, for example, an embedded beacon lamp as a beacon lamp such as an aerial beacon lamp for guiding an aircraft is embedded in a road surface of an airport runway or taxiway.

  In order to maintain the appearance of the sign even when the ambient brightness changes, such an embedded sign lamp switches the output current of the AC constant current power source according to the ambient brightness, etc. Lighting control is performed by a lighting control device that is a load control device so that the lamp operates at a predetermined luminous intensity ratio.

  As a light source, a halogen light bulb or the like has been conventionally used, but in recent years, a light-emitting diode (LED) that is energy-saving and has a long service life has been used. In this case, since the required current differs between the halogen bulb and the light-emitting diode even at the same luminous intensity, it cannot be handled simply by replacing the halogen bulb with the light-emitting diode.

Therefore, a plurality of windings for outputting a current of a light emitting diode corresponding to a predetermined luminous intensity ratio to the secondary side of a current transformer having a primary side connected to the AC constant current power source as it is There is known a beacon lamp configured to switch the output current by switching the taps (see, for example, Patent Document 1).
JP 2006-65724 A (page 6-8, FIG. 3)

  For example, in the case of a current transformer that switches between a rated tap with a luminous intensity ratio of 100% and an operating tap with a luminous intensity ratio of 10%, the primary current is 6.6 A corresponding to a halogen bulb, and the rated secondary current Is, for example, 350 mA, and the operating secondary current is, for example, 35 mA. Since the number of turns of the current transformer is the reciprocal of the current ratio, for example, when the primary winding has 10 turns, the secondary winding for the rated tap has 189 turns and the secondary winding of the operation tap has 1886 turns. . In addition, although the wire diameter of the winding is increased or decreased in accordance with the current to flow, according to the calculation by the present applicant, for example, for two light emitting diodes with a rated power of 1 W, 1.3 mm or more on the primary side. The wire diameter is required, 0.3 mm or more is required for the secondary winding of the rated tap, and 0.1 mm or more is required for the secondary winding of the operation tap. The current transformer is the so-called EI-48 core size, that is, the longest The side length is 48 mm. Such an EI-48 core size current transformer has a problem that it is too large to be incorporated in a lamp body of a marker lamp.

  This invention is made | formed in view of such a point, and it aims at providing the load control apparatus which can be reduced in size, and a marker lamp provided with the same.

The load control device according to claim 1 is provided separately from the primary winding connected to the AC constant current power source, the first secondary winding having a predetermined number of turns, and the first secondary winding. , has a smaller predetermined number of turns than the first secondary winding, and a current transformer with a second secondary winding of the first secondary winding and the primary side; the AC constant-current power supply And switching means for selectively connecting either the first secondary winding or the second secondary winding to the load side in response to the output current. It is.

  The load control device is used in, for example, an illumination device such as a marker lamp having a light source, but is not limited thereto.

  As the switching means, for example, a relay that detects a primary current and is turned on / off according to the current value is used.

The first secondary winding and the second secondary winding that are selectively connected to the load side by the switching means corresponding to the output current from the AC constant current power source are separated, and the first secondary winding By setting the winding as the primary side of the second secondary winding, the first secondary winding side and the second secondary winding side are each reduced in size, and the overall size can be reduced.

  The load control device according to claim 2 is the load control device according to claim 1, wherein the switching means short-circuits the second secondary winding in a state where the first secondary winding is connected to the load side. It is.

  And, when the first secondary winding is connected to the load side, the switching means short-circuits the second secondary winding while the first secondary winding is connected to the load side. Generation of a high voltage between the first secondary winding and the second secondary winding is prevented.

  The marker lamp according to claim 3 is a light source as a load, and a lighting unit including the load control device according to claim 1 or 2 for lighting the light source; and the light lamp is disposed above the lighting unit. And a lamp body.

  For example, there is an embedded type of aerial beacon light that is embedded in a road surface such as an airport runway or taxiway. However, the present invention is not limited to this. It may be ground type.

  For example, the light source is preferably a light emitting diode that is smaller than other light sources, but is not limited to the light emitting diode.

  The lamp body is configured, for example, to emit light from a light source sideways from an emission window.

  Then, by turning on the light source as a load covered by the lamp body with the load control device according to claim 1 or 2, a downsized sign lamp can be provided.

  According to a fourth aspect of the present invention, there is provided a marker lamp according to the third aspect, wherein the marker lamp includes a plurality of substrates that are spaced apart from each other in the lighting unit and on which a part of the load control device is mounted. The first secondary winding side is disposed separately from these substrates above the substrate, and the second secondary winding side of the current transformer is mounted on the uppermost substrate.

  The substrates are, for example, a pair, that is, two substrates, but are not limited to two.

  The first secondary winding side of the current transformer is arranged separately from the board above the board, and the second secondary winding side of the current transformer is mounted on the uppermost board, so that the overall weight balance is achieved. The influence of vibration is suppressed.

  The marker lamp according to claim 5 is the marker lamp according to claim 3 or 4, wherein the first secondary winding side of the light source and the current transformer is mounted at a position above the mounting portion between the lamp body and the lighting unit. It is what has been.

  And even if the first secondary winding side of the light source and the current transformer is attached at a position above the attachment portion between the lamp body and the lighting unit, even if it is flooded from the attachment portion between the lamp body and the lighting unit. , It is possible to prevent moisture from adversely affecting the light source and the first secondary winding.

According to the load control device of the first aspect, the first secondary winding and the second secondary winding that are selectively connected to the load side by the switching means in response to the output current from the AC constant current power source. Separately and by making the first secondary winding the primary side of the second secondary winding, the first secondary winding side and the second secondary winding side can be reduced in size, respectively. Can be miniaturized.

  According to the load control device of the second aspect, in addition to the effect of the load control device of the first aspect, the second secondary winding in a state where the switching means connects the first secondary winding to the load side. By short-circuiting the wire, it is possible to prevent a high voltage from being generated between the first secondary winding and the second secondary winding when the first secondary winding is connected to the load side.

  According to the marker lamp of the third aspect, the light source as a load covered by the lamp body is turned on by the load control device according to the first or second aspect, whereby a downsized marker lamp can be provided.

  According to the marker lamp of claim 4, in addition to the effect of the marker lamp of claim 3, the first secondary winding side of the current transformer is arranged separately from the substrate above the substrate, By mounting the second secondary winding side on the uppermost substrate, the entire weight balance can be dispersed and the influence of vibration can be suppressed.

  According to the marker lamp of claim 5, in addition to the effect of the marker lamp of claim 3 or 4, the first secondary winding of the light source and the current transformer is located above the mounting portion between the lamp body and the lighting unit. By attaching to the position, even if water is submerged from the attachment part of the lamp body and the lighting unit, it is possible to prevent moisture from adversely affecting the light source and the first secondary winding side.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 to 3 show a first embodiment, FIG. 1 is a circuit diagram of a load control device, FIG. 2 is a sectional view of a marker lamp provided with the load controller, and FIG. 3 is a plan view of the marker lamp. .

  2 and 3 is an aerial beacon light that is embedded in a road surface 12 such as an airport runway or taxiway, and is embedded in a road surface 12. A base (not shown), an adapter ring 13 for adjusting a rotational direction position as an installation member attached to the upper part of the base, a lamp body 14 detachably attached to the upper part of the adapter ring 13, and a base (not shown) And a lighting unit 15 that is covered with a lamp body 14.

  The adapter ring 13 is formed with a bottom 18 and a cylindrical peripheral wall portion 19 erected from the outer peripheral portion of the bottom portion 18, and a storage portion 20 for storing the lamp body 14 by the bottom portion 18 and the peripheral wall portion 19 is upward. An opening is formed. A plurality of mounting holes 21 for mounting to the base with bolts (not shown) and a plurality of insertion holes 22 for protruding the bolts B for mounting the lamp body 14 from below are formed on the periphery of the bottom 18, respectively. An opening 23 into which a part of the lamp body 14 is inserted is formed at the center of the bottom 18. A cable for supplying power to the lamp body 14 is wired on the base. The upper end of the peripheral wall portion 19 of the adapter ring 13 is embedded and installed at a height that substantially matches the road surface 12.

  The lamp body 14 has a disk-shaped lamp body 25, and there are a plurality of circumferential positions in the vicinity of the outer periphery of the lamp body 25, and fastening portions 26 that are fastened to the adapter ring 13 at three positions. Is formed. Each fastening portion 26 has a recess 27 and a mounting hole 28 at the bottom of the recess 27. Then, the lamp body 25 is fitted into the housing portion 20 of the adapter ring 13 via the packing 29, and each bolt B of the fastening part protruding from the adapter ring 13 side protrudes upward from each mounting hole 28 and is fastened to these bolts. The lamp body 14 is liquid-tightly fixed to the adapter ring 13 by screwing and tightening a cap nut N which is a nut of the component. The upper surface of the lamp body 14 has a convex shape with the central portion protruding slightly upward from the outer peripheral portion, and the outer peripheral portion of the upper surface of the lamp body 14 attached to the adapter ring 13 is the upper end of the peripheral wall portion 19 of the adapter ring 13 And the central portion of the upper surface of the lamp body 14 is disposed so as to protrude slightly above the upper end portion of the peripheral wall portion 19 of the adapter ring 13 and the road surface 12. A flat portion 14 a is formed at the center of the upper surface of the lamp body 14.

  On the upper side of the lamp body 25, there are two exit windows 31 that can emit light toward the sides in opposite directions opposite to each other, and from each exit window 31 to the outer periphery of the lamp body 25 A light exit groove 32 is formed so as to face.

  The two exit windows 31 have a quadrangular opening shape and are arranged at positions that are staggered with respect to the center position 25a of the lamp body 25, and at least a part of each of the exit windows 31 is formed on the lamp body 25. They are arranged on the opposite side of the emission direction a from the center position 25a.

  The exit groove 32 is formed so as to gradually expand from the bottom surface 33 of the groove that is inclined from the lower part of the exit window 31 to the upper end of the outer peripheral portion of the lamp body 25, and from the left and right sides of the exit window 31. It has groove side surfaces 34 on both sides, and is widened and opened toward the upper and side emission directions a.

  In addition, in the fastening part 26 provided at the position of the exit groove 32, the cap nut N is positioned at a position lower than the groove bottom surface 33 of the exit groove 32, and the projecting height of the lamp body 14 from the road surface 12 is lowered. However, the cap nut N does not block the light passing through the emission groove 32, and a desired light distribution can be obtained.

  In addition, a substantially cylindrical connecting portion 36 is formed on the lower side of the lamp body 25 so as to protrude downward at a position closer to the center than the position of the packing 29. The connecting portion 36 is fitted to the upper end of the lighting unit 15, thereby defining a space portion 37 between the lighting unit 15 and the upper side.

  Further, a jig (not shown) is engaged at two positions on the periphery of the lamp body 14 perpendicular to the emission direction a in which light is emitted from the respective emission windows 31 of the lamp body 14. A jig engaging portion 38 for lifting the lamp body 14 upward and removing it from the adapter ring 13 is formed.

  One jig engaging portion 38 is provided in the fastening portion 26 at a position orthogonal to the emission direction a in which light is emitted from each emission window 31 of the lamp body 14. An engagement hole 39 is formed in the inner wall surface toward the center of the lamp body 14. The other jig engaging portion 38 is provided with a groove portion 40 in the lamp body 14, and an engagement hole 39 is formed on the inner wall surface of the groove portion 40 toward the center of the lamp body 14.

  For example, using a bifurcated jig whose tip can be opened and closed, a hooking claw provided at each bifurcated tip of the jig is inserted into the recess 27 with respect to one jig engaging portion 38. And then hooked into the engagement hole 39, inserted into the groove 40 for the other jig engagement portion 38, hooked into the engagement hole 39, and pulled up the lamp body 14 while being hooked into both engagement holes 39. The adapter ring 13 can be removed.

  The lighting unit 15 includes a case 41 that is liquid-tightly attached to the lower surface of the lamp body 14 and a unit main body 42 that is accommodated in the case 41.

  The case 41 is formed in a substantially bottomed cylindrical shape having an opening 45 communicating with the space 37 at the upper end, and is formed so as to gradually increase in diameter from the lower side to the upper side. In addition, the case 41 includes a flat portion 46 for placing the upper portion of the unit main body 42 at the upper end, which is the periphery of the opening 45, and a lamp on the outer peripheral surface below the flat portion 46. A flange portion 47 on which the connection portion 36 of the body body 25 is placed is formed so as to protrude in the horizontal direction. Further, on the outer peripheral surface above the flange portion 47, a groove portion 49 for attaching a packing 48, which is an O-ring gasket sandwiched between the inner peripheral surface of the connection portion 36 of the lamp body 25, is continuous over the entire circumference. Is formed. Therefore, the lamp body 14 and the case 41 of the lighting unit 15 are connected in a liquid-tight manner.

  On the other hand, the unit main body 42 includes a plurality of substrates 55 and 56 that are substantially semicircular in plan view, and a mounting member that is substantially circular in plan view as a mounting member provided separately from the substrates 55 and 56. And 57. Each substrate 55, 56 is formed with a load control device 59 for turning on a light emitting diode (LED) 58 as a light source as a load.

  The substrates 55 and 56 are connected and integrated with each other via a spacer 61 which is an interval forming member, and are spaced apart from each other in the vertical direction. The substrates 55 and 56 are connected and fixed to the lower surface of the mounting bracket 57 by a spacer 62 which is an interval forming member attached to the upper surface of the substrate 55 in connection with the spacer 61.

  The mounting bracket 57 is an LED substrate on which two light emitting diodes 58 are mounted, and an optical system 64 is attached to each of the light emitting diodes 58. Further, the mounting bracket 57 has an outer peripheral edge portion placed on the flat surface portion 46 of the case 41, and a mounting screw 66 is screwed from above into a screwing hole 65 provided in the flat surface portion 46. The light emitting diodes 58 are integrally fixed to the opening 45 of the case 41, and are arranged at positions corresponding to the respective emission windows 31. Therefore, the mounting bracket 57 is a connecting portion between the connecting portion 36 and the flange portion 47, which is a mounting portion between the lamp body 14 and the lighting unit 15, in other words, a connecting surface (contact point) between the lamp body 14 and the lighting unit 15. It is attached above the surface. For this reason, the light emitting diode 58 is positioned above the connection surface between the lamp body 14 and the lighting unit 15.

  The optical system 64 is configured so that the light from each light emitting diode 58 is emitted from each exit window 31. The lens 67 that receives the light from the light emitting diode 58 and controls the light distribution, and the light distribution by the lens 67. A prism 68 for emitting controlled light from the emission window 31 is provided, and a lens 67 is attached to the upper surface of the mounting bracket 57 by a lens holder 69.

  The prism 68 is fitted in a liquid-tight manner from the inside of the emission window 31 through a packing (not shown), and is held by a holding plate 70 attached to the lower surface of the lamp body 25 in this state. The prism 68 is formed with an incident surface 71 for entering light from the lens 67, a reflecting surface 72 for reflecting incident light, and an exit surface 73 for emitting reflected light from the exit window 31. The reflecting surface 72 of the prism 68 is formed and arranged so that the light from the lens 67 is substantially totally reflected by the reflecting surface 72 of the prism 68. That is, a lens 67 is disposed opposite to the prism 68, and an incident direction in which light enters the prism 68 from the lens 67 and an exit direction a in which the light reflected by the reflecting surface 72 exits from the exit window 31 are substantially L-shaped. Are arranged in a relationship.

  The load control device 59 is a lighting control device (lighting control circuit) that controls the lighting of the light emitting diode 58 that is a load. As shown in FIG. 1, the load control device 59 is a commercial AC power source e that is an AC constant current power source. The primary winding CT1a of the current transformer CT having a predetermined number of turns is connected via the varistor TNR, and the first secondary winding CT2a is arranged opposite to the primary winding CT1a, and the rating as the first transformer section A current transformer CTa for supplying load electric power (high power) is configured, and each secondary winding CT1b, CT1c, CT1d connected to the first secondary winding CT2a is combined with the second secondary as a secondary transformer. Winding CT2b, third secondary winding CT2c, and fourth secondary winding CT2d are arranged, and current transformer CTb for supplying operational load power (low power) as a second transformer section separately from current transformer CTa. For the control power supply as the third transformer section A current transformer CTc and a current transformer CTd for current detection as a fourth transformer section are configured.

  The current transformer CTa is formed separately (separately) from the substrates 55 and 56 shown in FIG. 2 and is fixed to the lower surface of the mounting bracket 57 by mounting screws 75, and is located on the side of each substrate 55 and 56. ing. Therefore, the current transformer CTa is attached above the connection surface between the lamp body 14 and the lighting unit 15. The current transformers CTb to CTd are mounted on the lower surface of the substrate 55 positioned on the upper side, and are positioned between the substrates 55 and 56. The current transformers CTa to CTd are in a non-contact state separated from the inner surface of the case 41, that is, in a suspended state. In other words, a space 77 is formed between the case 41 and the unit main body 42.

  Returning to FIG. 1, the first secondary winding CT2a is set to a predetermined number of turns so as to have a predetermined turn ratio with respect to the primary winding CT1a in order to allow the rated current to flow through the light emitting diode 58. Further, a plurality of, that is, two different first switching taps T1a and T1b, which are input side relay terminals of the relay Ry serving as switching means, are connected to the winding start side of the first secondary winding CT2a. Further, the winding end side of the first secondary winding CT2a is connected to the primary windings CT1b, CT1c, CT1d, respectively.

  The second secondary winding CT2b is set to have a predetermined number of turns so as to have a predetermined turn ratio with respect to the primary winding CT1a in order to cause an operating current smaller than the rated current to flow through the light emitting diode 58. Therefore, the second secondary winding CT2b has a smaller number of turns than the first secondary winding CT2a. Further, a second switching tap T2a that is an input side relay terminal of the relay Ry that is paired with the first switching tap T1a is connected to the winding start side of the second secondary winding CT2b.

  Here, the relay Ry is provided as a first switch unit provided between the output taps TOa and TOb, which are output side terminals as output side relay terminals, and the output tap TOa and the switching taps T1a and T2a and switched by an excitation current. Each of the switch taps T1a and T2a is provided with a switch piece SW1 and a switch piece SW2 serving as a second switch section provided between the output tap TOb and the first switching tap T1b and switched by the excitation current. Control is performed such that the first switching tap T1b is switched to be connected to the output tap TOb while switching to be connected to the tap TOa.

  The output tap TOb of the relay Ry is connected to the winding start side of the primary winding CT1b. Between the output taps TOa and TOb of this relay, full-wave rectification means is connected as diodes D1 to D4. A bridge diode BD1 is connected. Further, a parallel circuit of a series circuit of a resistor R1, a constant voltage element Zener diode ZD1 and a resistor R2 and a thyristor SCR as a switching element is connected to the output side of the bridge diode BD1, and the anode side of the Zener diode ZD1 And the resistor R2 are connected to the gate of the thyristor SCR to form the surge protector 79. The light emitting diode 58 is connected to the negative output side of the bridge diode BD1 via the surge protection unit 79.

  The third secondary winding CT2c has a smaller number of turns than the first secondary winding CT2a. The third secondary winding CT2c is connected to a constant power source 81 for controlling the relay Ry. This control constant power supply unit 81 has an N-channel field effect transistor (FET) for chopping as a switching element on the output side of the bridge diode BD2 as full-wave rectification means connected to the third secondary winding CT2c. ) A parallel circuit of Q1 and a smoothing electrolytic capacitor C1 is connected, and a diode D5 is connected between the source terminal of the field effect transistor Q1 and the positive side of the electrolytic capacitor C1. Further, on the output side of the electrolytic capacitor C1, for example, a constant voltage ICIC1 having three terminals, a comparator or ICIC2 as a comparator, a Zener diode ZD2 as a constant voltage element, and a series circuit of voltage dividing resistors R3 and R4, Are connected in parallel.

  The constant voltage ICIC1 has a capacitor C2 connected between the input terminal and the ground terminal, and a parallel circuit of a capacitor C3 and an electrolytic capacitor C4 connected between the output terminal and the ground terminal. Yes.

  The ICIC2 has a positive terminal connected to the cathode side of the diode D5 and a negative terminal connected to the ground. Further, the non-inverting input terminal of the ICIC2 is connected to the connection point of the resistors R3 and R4, and the inverting input terminal is connected to the output side terminal of the constant voltage ICIC1 and is used for the reference voltage setting resistors R5 and R6. Are connected to the connection points of these resistors R5 and R6. The connection point of the resistors R5 and R6 is connected to the ground via the capacitor C5. The output terminal of the ICIC2 is connected to the gate terminal of the voltage effect transistor Q1 through the resistor R7, and the connection point between the resistor R7 and the gate terminal of the field effect transistor Q1 is connected to the ground through the resistor R8. Has been.

  The fourth secondary winding CT2d has a smaller number of turns than the first secondary winding CT2a. The fourth secondary winding CT2d is connected to a parallel circuit of a resistor R9 and a series circuit of a resistor R10 and a diode D6, and a parallel circuit of a resistor R11 and a capacitor C6 on the cathode side of the diode D6. The fourth secondary winding CT2d, the resistors R9, R10, R11, the diode D6, and the capacitor C6 constitute a current detection unit 83 that monitors the primary current.

  The output side of the capacitor C6 is connected via a resistor R12 to a comparator as an operational amplifier which is a level determination means as a comparator, that is, a non-inverting input terminal of ICIC3. The inverting input terminal of the ICIC3 is a resistor R13, R14 in a series circuit of a reference voltage setting resistor R13, R14 and a variable resistor VR formed between the output terminal of the constant voltage ICIC1 of the control constant power supply unit 81 and the ground. The capacitor C7 is connected in parallel with the resistor R14 and the variable resistor VR, while being connected to the connection point of R14.

  Further, a series circuit of resistors R16 and R17 is connected to the output terminal of ICIC3, and a connection point of these resistors R16 and R17 is connected to a base terminal of an NPN transistor Q2 which is a switching element. Connected between the base terminal and the emitter terminal. A resistor R18 is connected between the output terminal and the non-inverting input terminal of ICIC3. Furthermore, a parallel circuit of a diode D7 and a relay Ry is connected to the collector terminal of the transistor Q2, and the cathode side of the diode D7 is connected to the cathode side of the Zener diode ZD2 of the control constant power supply unit 81. The resistors R12 to R18, ICIC3, the capacitor C7, and the transistor Q2 constitute a current level determination unit 85 that determines the level of the primary current value detected by the current detection unit 83 based on the current threshold set in the ICIC3. ing. Therefore, the current threshold value of ICIC3 is set to an intermediate value between the rated current (350 mA) of the light emitting diode 58 and the operating current (35 mA), for example.

  ICIC3 may be a chip included in the same package as ICIC2.

  In the embedded sign lamp 11 configured as described above, the current detection unit 83 monitors the current value of the primary current via the current value flowing through the resistor R11, and the current level determination unit 85 uses, for example, a light emitting diode. By turning the transistor Q2 on and off by judging whether the 58 is set to the rated current (350 mA) that emits light at a luminous intensity ratio of 100% or the operating current (35 mA) that emits light at a luminous intensity ratio of 10%. By supplying the power from the control constant power supply unit 81 to the relay Ry and turning this relay Ry on and off, each wave flows to the light emitting diode 58 by full-wave rectification by the bridge diode BD1, and the light emitting diode 58 Lights on.

  Specifically, in the state where the relay Ry is turned off, the switch piece SW1 connects the first switching tap T1a and the output tap TOa, and the switch piece SW2 is turned off from the first switching tap T1b, so that the first secondary winding is performed. When the rated current is supplied from the line CT2a side to the light emitting diode 58 side and the relay Ry is turned on, the switch piece SW1 connects the second switching tap T2a and the output tap TOa, and the switch piece SW2 switches the first switch The tap T1b and the output tap TOb are connected, and an operating current is supplied from the second secondary winding CT2b side to the light emitting diode 58 side.

  When the light-emitting diodes 58 are turned on, the light from each light-emitting diode 58 enters the lens 67, and the light emitted from the light distribution is controlled by the lens 67 from the incident surface 71 of the prism 68. The incident light is totally reflected by the reflection surface 72 and emitted from the emission surface 73, that is, the light is emitted from the emission window 31 through the emission groove 32 to the side.

  As described above, the first secondary winding CT2a and the second secondary winding CT2b are separate current transformers CTa and CTb, and the first secondary winding CT2a is the second secondary winding CT2b. By adopting the primary side, the current transformer CTa including the first secondary winding CT2a and the current transformer CTb including the second secondary winding CT2b can be reduced in size, and the load control device 59 and the embedded sign lamp 11 can be reduced. As a whole.

  By configuring as described above, for example, the current transformer CTa has a so-called EI-41 core size (longest side length 41 mm), and the current transformer CTb has an EI-24 core size (longest side length 24 mm).

  That is, since the size of each of the current transformers CTa and CTb can be suppressed, the degree of freedom in arrangement can be improved as compared with the case where these current transformers are made one large current transformer, and the case 41 is relatively small. The load control device 59 can be arranged in a space-saving manner by effectively using a dead space.

  Similarly, the current transformers CTc and CTd including the secondary windings CT2c and CT2d having the first secondary winding CT2a as the primary side are separated from the current transformer CTa, respectively, so that the current transformers CTc and CTd are also small. The degree of freedom of arrangement can be improved.

  For example, the current transformer CTc is a so-called EI-24 core size (longest side length 24 mm), and the current transformer CTd is a ring core having a diameter of 20 mm.

  As a result, by using the load control device 59 in the embedded marker lamp 11, for example, it can be easily arranged even in a general small marker lamp having a diameter of about 60 mm, and a compact embedded marker lamp 11 is provided. it can.

  In addition, the current transformer CTa, which is the largest weight in the load control device 59 including the first secondary winding CT2a, is placed separately on the mounting bracket 57 above the boards 55 and 56, and the second secondary winding. By mounting current transformer CTb, which is a heavy object including CT2b, on the board 55 located on the upper side, the weight balance inside the case 41 is dispersed and the heavy object is concentrated on the lower side. This makes it less susceptible to vibration.

  Further, by fixing the current transformer CTa including the first secondary winding CT2a to the mounting bracket 57 for combining the lighting unit 15 and the lamp body 14, the current from the mounting portion of the lamp body 14 and the lighting unit 15 can be reduced. The distance to the transformer CTa can be reduced, making it less susceptible to vibration.

  Similarly, by mounting the current transformers CTc and CTd, which are heavy objects including the secondary windings CT2c and CT2d, on the board 55 positioned on the upper side, the weight balance inside the case 41 is further dispersed, and vibration is reduced. Can be less affected.

  Moreover, by arranging the current transformer CTa separately from the boards 55 and 56, for example, even when the specification of the power supply on the primary side is changed, the current transformer CTa can be easily replaced. Can easily cope with specification changes.

  By attaching the current transformer CTa including the light emitting diode 58 and the first secondary winding CT2a to a position above the attachment portion of the lamp body 14 and the lighting unit 15, the light emitting diode 58 and the first secondary winding CT2a are mounted. Even if it is in a position deviated upward from the flooding route and flooded from the mounting part of the lamp body 14 and the lighting unit 15, moisture should have an unfavorable effect on the light emitting diode 58 and the first secondary winding CT2a side. Can be suppressed.

  In addition, the unit main body 42 including the current transformers CTa to CTd is suspended in the case 41 to form a space 77 between the case 41 and the water inside the case 41 even when the case 41 is submerged. The water stays in the unit body 42, making it difficult for moisture to go to the unit body 42 side.

  In particular, since the light emitting diode 58 cannot be subjected to a drip-proofing process, the light emitting diode 58 can be reliably protected against water flooding by being disposed on the upper side of the mounting bracket 57.

  Next, FIG. 4 shows a second embodiment, and FIG. 4 is a circuit diagram of the load control device. In addition, about the structure and effect | action similar to the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the second embodiment, the relay Ry of the first embodiment is connected to the first secondary winding CT2a on the light emitting diode 58 side, that is, in the off state, the second secondary winding. This is a short circuit between both terminals of CT2b.

  That is, the second secondary winding CT2b has a plurality of, that is, two different second switching taps T2a and T2b, and the relay Ry has the switch piece SW2 provided between the output tap TOb and the switching taps T1b and T2b. ing.

  When the rated current is supplied to the light emitting diode 58 side, that is, when the light emitting diode 58 is caused to emit light at a luminous intensity ratio of 100%, no exciting current flows to the relay Ry, the relay Ry is turned off, and the switch piece SW1 is 1 switching tap T1a and output tap TOa are connected, switch piece SW2 is connected to 2nd switching tap T2b and output tap TOb, and the rated current flows from the first secondary winding CT2a side to the light emitting diode 58 side. When the relay Ry is supplied, the switch piece SW1 connects the second switching tap T2a and the output tap TOa, the switch piece SW2 connects the first switching tap T1b and the output tap TOb, By supplying the operating current from the secondary winding CT2b side to the light emitting diode 58 side, not only can the same effect as the first embodiment described above be achieved, but also in the OFF state of the relay Ry, Both terminals of the second secondary winding CT2b Since it is short-circuited by the chip piece SW2, it is possible to prevent a high voltage from occurring between the secondary windings CT2a and CT2b, that is, between the switching taps T1b and T2a serving as open ends.

  And by preventing such a high voltage, the dielectric breakdown etc. accompanying a high voltage can be prevented and reliability can be improved.

  In each of the above embodiments, the indicator lamp is not limited to the embedded type.

  Further, the load control device 59 can be used for any lighting device other than the marker lamp.

  Furthermore, any light source other than the light emitting diode 58 can be used as the light source.

  And it can apply not only to a light source but to arbitrary loads.

1 is a circuit diagram of a load control device showing a first embodiment of the present invention. It is sectional drawing of the marker lamp provided with the load control apparatus same as the above. It is a top view of a marker lamp same as the above. It is a circuit diagram of the load control apparatus which shows the 2nd Embodiment of this invention.

Explanation of symbols

11 Recessed beacon as a beacon
14 lamp
15 Lighting unit
55, 56 substrates
58 Light-emitting diode as a light source as a load
59 Load control device
CT current transformer
CT1a primary winding
CT2a 1st secondary winding
CT2b Secondary winding e Commercial AC power supply that is an AC constant current power supply
Relay as Ry switching means

Claims (5)

The primary winding connected to the AC constant current power source, the first secondary winding having a predetermined number of turns, and the first secondary winding are provided separately from the first secondary winding. A current transformer including a second secondary winding having a small predetermined number of turns and having the first secondary winding as a primary side;
Switching means for detecting an output current from the AC constant current power source and selectively connecting either the first secondary winding or the second secondary winding to the load side in response to the output current;
A load control device comprising: The load control device according to claim 1, wherein the switching unit short-circuits the second secondary winding in a state where the first secondary winding is connected to the load side. A light source as a load, and a lighting unit comprising the load control device according to claim 1 for lighting the light source;
A lamp placed over the lighting unit and covering the light source;
A sign lamp characterized by comprising: A plurality of substrates mounted on a part of the load control device, spaced apart from each other and disposed in the lighting unit;
The first secondary winding side of the current transformer is disposed separately from these substrates above the substrate,
The marker lamp according to claim 3, wherein the second secondary winding side of the current transformer is mounted on the uppermost substrate. 5. The marker lamp according to claim 3, wherein the first secondary winding side of the light source and the current transformer is attached at a position above an attachment portion between the lamp body and the lighting unit.

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