JP2006015863A - Luminaire for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire for a vehicle operating by receiving power supply from a battery capable of maintaining lamp illuminance constant, even if battery voltage fluctuates, and always turning on the lamp in an optimum state to prevent shortening of the service life of the lamp. <P>SOLUTION: This luminaire 1 is provided with the lamp 3 and a lighting circuit 66 for turning on and driving the lamp 3, and receives power supply from the battery 110 provided in the vehicle. On an upstream side of the lighting circuit 66, a constant voltage circuit 65 is provided to keep supply voltage from the battery 110 constant. The lighting circuit 66 performs a stable operation by receiving an output of the constant voltage of the constant voltage circuit 65. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lighting device for a vehicle that is used by being attached to a railway vehicle such as a train or a bus, and more particularly to a lighting device for a vehicle that operates by receiving power supply from a battery.

  For example, there are both alternating current and direct current as power supplies for railway vehicles, but direct current is often used for conventional railways. In addition, when traveling in the city center, it may be supplied with direct current, and in the suburbs, alternating current may be supplied.

In such a vehicle to which DC power is supplied, a battery is provided in the vehicle, and the supplied DC power is temporarily stored in the battery, and power is supplied from this battery to the vehicle lighting device, and lighting is performed. A lamp (fluorescent tube. The fluorescent tube refers to, for example, an FL tube, an FLR tube, a T5 tube, etc.) is driven to be lit by a lighting circuit inside the instrument (for example, Patent Document 1).
JP 2000-350377 A

  By the way, in a vehicle equipped with the battery as described above, the voltage of the battery may fluctuate greatly.

  For example, as described above, in a vehicle that travels in an AC / DC section, there is a non-power supply section in which power is not supplied to the vehicle when alternating current and direct current are switched. At that time, the train runs in inertia, the battery voltage decreases, and the battery voltage increases when power supply is resumed.

  In addition, when checking and cleaning the vehicle in the garage after daily work, the lamp is turned on using the power stored in the battery, so the battery voltage drops and charging resumes at the next run. Battery voltage rises.

  However, if the battery voltage decreases, the lamp illuminance of a lighting fixture that receives power from the battery also decreases, and if the battery voltage increases, the lamp illuminance also increases. There was a drawback that could not be done.

  In addition, the operation of the driving circuit for lighting the lamp becomes unstable due to fluctuations in the battery voltage, and the lamp cannot be lit in an optimum state, which causes a shortened lamp life.

  Note that the voltage fluctuation of the battery as described above extends to about DC 70 to 110 V, and is larger than the voltage fluctuation allowed for lighting fixtures other than those for vehicles. The problems of instability of lamp illuminance and shortening of lamp life are more prominent than lighting fixtures other than those for vehicles.

  The present invention has been made in view of such circumstances, and even when the battery voltage fluctuates, the lamp illuminance can be maintained constant and the lamp can be lit in an optimal state at all times. It is an object of the present invention to provide a vehicle lighting device that can prevent the lamp life from being shortened.

  In the vehicular lighting fixture that includes a lamp and a lighting circuit that drives and drives the lamp, and receives power supply from a battery provided in the vehicle, the supply from the battery is provided upstream of the lighting circuit. This is solved by a vehicular illuminator characterized in that a constant voltage circuit that outputs a constant voltage is provided.

  According to this vehicular lighting fixture, since the constant voltage circuit that outputs the voltage supplied from the battery at a constant level is provided upstream of the lighting circuit, the lighting circuit is operated by the constant voltage circuit even if the battery voltage fluctuates. Is supplied with a constant voltage.

  The vehicle lighting device is preferably used for a railway vehicle having a particularly large battery voltage fluctuation.

  According to the first aspect of the present invention, since the constant voltage circuit is provided, the lamp can be driven to light at a constant voltage even when the battery voltage fluctuates, so that the illuminance in the vehicle by the lamp can be kept constant. Can do.

  In addition, since the lighting circuit can be stably operated regardless of the voltage of the battery by the constant voltage circuit, the lamp can be driven to be lit in an optimum state at all times, and the lamp life can be extended.

  According to the second aspect of the present invention, the effect can be exhibited more effectively by being used in a railway vehicle in which the battery voltage fluctuates particularly.

  An embodiment of the present invention will be described below.

  FIG. 1 is a perspective view showing a main part of a lighting fixture 1 for a train according to an embodiment of the present invention, disassembled and omitting a wiring cord, and FIG. 2A is an illumination in a state where the wiring cord is omitted. FIG. 3 is a plan view of the fixture 1, (b) is a front view with a part of the fixture body cut away, FIG. 3 is an enlarged perspective view of the main part of the lighting fixture 1, and FIG. is there.

  As shown in FIG. 1, the lighting fixture 1 is used by being attached to a ceiling 100 in a train, and has a fixture body 2, a lamp 3, and a cover 4. The instrument body 2 is a pair of vertical plates having a long horizontal plate portion 21 that functions as a reflector, and provided in the longitudinal direction at both ends in the width direction of the horizontal plate portion 21 and having an inner bent portion 23 at the lower end portion. The portions 22 and 22 form a channel shape.

  The lamp 3 is connected to a pair of sockets 5, 5 (shown in FIG. 2) connected to both ends of the fixture body 1 at both ends in the longitudinal direction of the fixture body 1. By this, it is supported by the horizontal board part 21 in the downward direction. When the length of the lamp 3 is long, a holder (not shown) that supports an intermediate portion in the length direction of the lamp 3 may be provided on the horizontal plate portion 21.

  The cover 4 covers the lamp 3 and includes a pair of upper projecting pieces 42 and 42 formed on the upper surface of the opening 41 facing the front and rear opening edges extending in the length direction so as to face each other. In a state of being fitted between the inner bent portions 23, 23 of the two vertical plate portions 22, 22, the instrument main body 2 is detachably fixed by known means. The cover 4 is made of a light transmissive resin.

  On the upper surface of the horizontal plate portion 21 of the appliance main body 2, the lighting control unit 6 is attached via a unit attachment member 7. The lighting control unit 6 is a so-called inverter that drives the lamp 3 to light, and the unit 6 contains circuit components such as an oscillation circuit. The circuit in the lighting control unit 6 will be described later.

  The unit attachment member 7 includes two plate-like leg portions 71 and 71 erected in a manner facing the upper surface of the horizontal plate portion 21 of the instrument main body 2 and the upper end portions of the leg portions 71 and 71. It is provided with a erected top plate portion 72 and short horizontal inner folded portions 73 and 73 formed at the lower ends of the leg portions 71 and 71, and is orthogonal to the opposing direction of the leg portions 71 and 71. It is formed in a substantially downward U shape with both sides of the direction largely open.

  And the length direction of the said top-plate part 72 is made into the direction which matched the length direction of the horizontal board part 21 of the instrument main body 2, and each inner folding | turning part 73 and 73 is the upper surface of the horizontal board part 21 of the instrument main body 2. And is screwed to the horizontal plate portion 21 with screws 74 and 74 that pass through the horizontal plate portion 21 from below the horizontal plate portion 21 and are screwed into the inner folded portions 73 and 73. It is fixed.

  On the other hand, the lighting control unit 6 is formed with thin flange portions 61 and 61 projecting in the length direction at upper ends of both ends in the length direction. Then, with the top surface of the lighting control unit 6 and the top surfaces of the flange portions 61, 61 in contact with the bottom surface of the top plate portion 72 of the unit mounting member 7, the top plate portion 72 is moved from above the top plate portion 72. The unit mounting member 7 is screwed and fixed by a screw 62 that passes through and is screwed into the flange portions 61 and 61.

  Here, the thickness (height) of the lighting control unit 6 is set to be sufficiently smaller than the distance between the top plate portion 72 of the unit mounting member 7 and the horizontal plate portion 21 of the instrument main body 2. As shown in detail in FIG. 4, a sufficient gap 8 is formed between the control unit 6 and the horizontal plate portion 21. The gap 8 is for relaxing the operating environment of the lighting control unit 6.

  That is, the luminaire 1 is turned on during train operation. In summer, etc., the train may be hot until the air conditioner starts working immediately after the start of operation. However, various factors such as the air conditioner and ventilation fan in the train cause air movement, that is, wind on the back of the ceiling. However, this wind passes through the gap 8 between the lighting control unit 6 and the horizontal plate portion 21 of the instrument body 2. For this reason, a cooling effect is brought about on the lighting control unit 6, and the operating environment of the lighting control unit 6 can be relaxed.

  Further, the heat from the lamp 3 is conducted to the horizontal plate portion 21 of the fixture body 2 by the lighting operation of the lamp 3, but there is a gap 8 between the horizontal plate portion 21 and the lighting control unit 6. The air layer in the gap 8 functions as a heat insulating layer, and heat conduction from the lamp 3 to the lighting control unit 6 through the horizontal plate portion 21 can be suppressed. Moreover, since heat is separately dissipated from both the lamp 3 and the lighting control unit 6 to the air layer in the gap 8, the temperature rise of the lighting control unit 6 can be further suppressed.

  In this embodiment, as described above, the unit attachment member 7 that supports the lighting control unit 6 is attached to the upper surface of the horizontal plate portion 21 of the appliance body 2, so that the unit attachment member 7 is removed from the horizontal plate portion 21. It is in a state of protruding upward. For this reason, the train ceiling 100 to which the luminaire 1 is attached is provided with a hole 101 having a size corresponding to the unit attachment member 7, as shown in FIG. The horizontal plate portion 21 is fixed to the ceiling 100 by a known method with the unit mounting member 7 fitted in the hole 101.

  As shown in FIG. 5, the lighting fixture 1 includes a jack 9a at the tip of a power cord 9 drawn from the lighting control unit 6 and a plug 9b connected to a battery in the train, as shown in FIG. Connect and receive power from the power supply. In this embodiment, the alignment bracket 10 of the power cord 9 is erected on the upper surface of the horizontal plate portion 21 of the instrument body 2, and the ring-shaped alignment member 11 inserted through the power cord 9 is screwed into the bracket 10. It has been stopped.

  In FIG. 5, reference numeral 12 denotes a connection cord for connecting the lighting control unit and the lamp socket 5, and this connection cord 12 is also latched by a latch member 13 provided on the horizontal plate portion 21 of the instrument body 2. It is routed well together.

  Further, the power cord 9 and the connection cord 12 drawn out from the lighting control unit 6 do not bypass the leg portion 71 of the unit attachment member 7 as shown in FIG. 2) may be provided and the cord through hole may be inserted.

  FIG. 6 is a circuit diagram showing an electrical system of the lighting device 1.

  In FIG. 6, the lighting device 1 includes input terminals 63 and 63, a full-wave rectifier circuit 64 connected to the input terminals 63 and 63, and a constant voltage circuit connected to the output side of the full-wave rectifier circuit 64. 65 and an oscillation / control circuit 66 as a lighting circuit connected to the output side of the constant voltage circuit 65, and the lamp 3 is connected to the output of the oscillation / control circuit 66.

  In the lighting device 1, the jack 9a shown in FIG. 5 is connected to the input terminals 63 and 63, and the jack 9a is connected to the plug 9b connected to the battery 110 provided in the vehicle. The power supply is supplied from the battery 110 to operate. However, in this embodiment, the full-wave rectifier circuit 64 is provided so that power can be supplied from an AC power supply.

  The constant voltage circuit 65 converts the voltage of the battery 110 into a constant voltage regardless of the fluctuation, and a chopper circuit is used in this embodiment. Specifically, the constant voltage circuit 65 includes a coil 651 inserted in the plus line of the full-wave rectifier circuit 64, and an anode and a cathode between the output side of the coil 651 and the minus line of the full-wave rectifier circuit 64. FET (field effect transistor) 652 as a switching element connected to each other, a diode 653 having an anode connected to a connection point between the coil 651 and the FET 652 and a cathode connected to the oscillation / control circuit 66, and a cathode of the diode 653 And a chopper control circuit 654 connected between the gates of the FET 652, and an electrolytic capacitor 655 connected between the cathode of the diode 653 and the negative line of the full-wave rectifier circuit 64.

  The coil 651 induces an induced voltage based on the switching operation of the FET 652. The magnitude of the induced voltage depends on the magnitude of the current flowing through the coil 651 when the FET 652 is turned off. The diode 653 is for blocking a reverse current, and the capacitor 655 charges an induced voltage induced in the coil 651.

  The chopper control circuit 654 inputs a gate signal for turning on / off the FET 652 to the gate of the FET 652. The chopper control circuit 654 monitors the charging voltage of the capacitor 655, that is, the output voltage of the constant voltage circuit 65, and controls the on / off timing of the FET 652 so that the output voltage becomes a constant value.

  Specifically, the chopper control circuit 654 includes a comparison unit that compares the output voltage of the constant voltage circuit 65 with a reference voltage. When the output voltage is lower than the reference voltage, the ON time of the FET 652 is lengthened. By turning off the FET 652 in a state where the current flowing through the coil 651 is increased, the induced voltage induced in the coil 651 is increased, and the output voltage of the constant voltage circuit 65 is increased. On the other hand, when the output voltage exceeds the reference voltage, the on-time of the FET 652 is shortened to turn off the FET 652 in a state where the current flowing through the coil 651 is reduced, thereby reducing the induced voltage induced in the coil 651 and reducing the constant voltage. The output voltage of the voltage circuit 65 is reduced.

  By such control, the output voltage of the constant voltage circuit 65 is kept constant, so that a constant voltage is input to the oscillation / control circuit 66.

  The oscillation / control circuit 66 controls the oscillation of the voltage supplied from the constant voltage circuit 65 and drives the lamp 3 to light.

  Next, the electrical operation of the lighting fixture 1 shown in FIG. 6 will be described.

  When the lighting apparatus 1 is used, the jacks 9a and 9a of the input terminals 63 and 63 are connected to the plugs 9b and 9b drawn from the battery 110 installed in the vehicle.

  The FET 652 is on / off controlled by the chopper control circuit 654. When the FET 652 is turned off, an induced voltage is generated in the coil 651, and the capacitor 655 is charged by this induced voltage.

  On the other hand, the oscillation / control circuit 66 oscillates the voltage supplied from the constant voltage circuit 65 and controls the lighting of the lamp 3.

  In this state, for example, if a vehicle traveling in an AC / DC section travels through a non-power source section at the AC / DC switching position and the voltage of the battery 110 decreases, the output voltage of the constant voltage circuit 65 will also decrease. And The output voltage of the constant voltage circuit 65 is monitored by the chopper control circuit 654. When the output voltage decreases, the chopper control circuit 654 extends the on-time of the FET 652 to increase the current flowing through the coil 651, and in this state the FET 652 is turned off. Let

  When the FET 652 is turned off while the current flowing through the coil 651 is increased, a large induced voltage is induced in the coil 651 and the output voltage of the constant voltage circuit 65 (terminal voltage of the capacitor 655) increases.

  On the other hand, when the output voltage of the constant voltage circuit 65 increases too much, the chopper control circuit 654 shortens the ON time of the FET 652 to decrease the current flowing through the coil 651, and in this state, turns off the FET 652.

  When the FET 652 is turned off while the current flowing through the coil 651 is reduced, the induced voltage of the coil 651 is also reduced, and the output voltage of the constant voltage circuit 65 (terminal voltage of the capacitor 655) is lowered.

  Thus, by controlling the on / off timing of the FET 652, the output voltage of the constant voltage circuit 65 is always kept constant regardless of the fluctuation of the voltage of the battery 110. That is, since the voltage supplied to the oscillation / control circuit 66 is maintained at a constant value, the oscillation / control circuit 66 performs a stable lighting drive operation of the lamp 3. Thereby, even if a large voltage fluctuation of the battery 110 occurs, the illuminance of the lamp 3 can be kept constant, and the life of the lamp 3 can be extended by a stable operation.

  In addition, although the above embodiment demonstrated the lighting fixture 1 applied to a train, this invention does not prevent the application to the lighting fixture used for other vehicles, such as a bus | bath.

  The configuration of the constant voltage circuit 65 is not limited to that of the illustrated embodiment, and various known constant voltage circuits can be applied.

It is a perspective view which decomposes | disassembles the principal part of the lighting fixture for trains which concerns on one Embodiment of this invention, and abbreviate | omits a wiring cord. (A) is a top view of the lighting fixture of the state which abbreviate | omitted the wiring cord, (b) is a front view which notches and shows a part of fixture main body. It is an expansion perspective view of the principal part of a lighting fixture. It is the IV-IV sectional view taken on the line of FIG. (A) is an enlarged plan view of the principal part of a lighting fixture, (b) is a front view which notches and shows a part of fixture main body. 1 is a circuit diagram of a railway vehicle lighting apparatus according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Appliance main body 3 Lamp 4 Cover 6 Lighting control unit 7 Unit attachment member 8 Gap 21 Horizontal flat plate portion 22 Vertical plate portion 23 Inner bending portion 65 Constant voltage circuit 66 Transmission / control circuit (lighting circuit)
651 Coil 652 FET
654 Chopper control circuit 655 capacitor

Claims (2)

In a vehicle lighting device that includes a lamp and a lighting circuit that lights and drives the lamp, and receives power supply from a battery provided in the vehicle,
A lighting device for a vehicle, wherein a constant voltage circuit for outputting a constant supply voltage from the battery is provided upstream of the lighting circuit.   The vehicle lighting device according to claim 1, which is used in a railway vehicle.

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