JP2010055841A - Lighting system, lighting system for vehicle interior, and lighting system for vehicle - Google Patents

Lighting system, lighting system for vehicle interior, and lighting system for vehicle Download PDF

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JP2010055841A
JP2010055841A JP2008217427A JP2008217427A JP2010055841A JP 2010055841 A JP2010055841 A JP 2010055841A JP 2008217427 A JP2008217427 A JP 2008217427A JP 2008217427 A JP2008217427 A JP 2008217427A JP 2010055841 A JP2010055841 A JP 2010055841A
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emitting diode
light emitting
lighting
connected
switching element
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JP5624269B2 (en
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Takashi Kanbara
Haruo Nagase
春男 永瀬
隆 神原
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Panasonic Electric Works Co Ltd
パナソニック電工株式会社
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Abstract

In a lighting device including a plurality of lighting fixtures each using a light emitting diode as a light source, the luminance and color of the light emitting diodes do not vary between the lighting fixtures, the cost is low, the construction work is easy, and the lighting efficiency It is an object of the present invention to provide an illumination device, a vehicle interior illumination device, and a vehicle illumination device that can enhance the vehicle.
The lighting device includes a plurality of lighting fixtures B each using a light-emitting diode LED as a light source, and one light-emitting diode driving circuit A that outputs a DC voltage. Each lighting fixture B is connected in series via the connection line CL1. Both ends of the series circuit of each lighting fixture B are connected to the output end of the light emitting diode driving circuit A through a pair of power supply lines PL1 and PL2.
[Selection] Figure 1

Description

  The present invention relates to a lighting device using a light emitting diode as a light source, a lighting device for a vehicle interior using the lighting device in a vehicle interior, and a vehicle lighting device using the lighting device for a vehicle.

  2. Description of the Related Art Conventionally, there has been provided a lighting device including a lighting fixture that uses a light emitting diode as a light source and a light emitting diode driving circuit that drives the lighting fixture.

  Light-emitting diodes have a longer life than incandescent bulbs, have a quick response, can be mounted compactly, and can easily express various colors without a color filter, depending on the application.

  Further, the brightness of the light emitting diode has a strong correlation with the forward current (forward current), and when the forward current is increased, the brightness increases monotonically up to the threshold current. Therefore, dimming can be easily performed by changing the forward current.

  In light emitting diodes, white light emitting diodes have been mass-produced in recent years, and their uses are diversified. In the field of vehicles, development has been carried out for use in white light in a passenger compartment, headlights with increased brightness, and daytime running lamps. When a white light emitting diode is used as a light source, the lighting fixture can be mounted thinly and three-dimensionally compared to the case where a fluorescent lamp or the like is used, and a free design that does not limit the shape such as a car design is possible.

  As a method for setting the light emitting color of the light emitting diode to white, there is a method using a yellow phosphor for a blue light emitting diode. In the white light emitting diode manufactured by this method, when the forward current changes, the hue may change with luminance.

  Specifically, when the forward current decreases, it shifts in the yellow direction, and when the forward current increases, it tends to shift in the blue direction.

  Therefore, in a lighting device having a plurality of lighting fixtures each using a white light emitting diode as a light source, if the current supplied to each lighting fixture varies between the lighting fixtures, variations in luminance and hue occur between the lighting fixtures. Sometimes.

  As a lighting device including a plurality of lighting fixtures, there is a lighting device used for a vehicle headlight as shown in FIG. There are two lighting fixtures B, and each includes a light emitting diode unit U in which a plurality of light emitting diodes LED are connected in series as a light source. The two lighting fixtures B are connected to the two light emitting diode drive circuits A through two pairs (four) of feeder lines PL1 and PL2, respectively. The light from the light emitting diode LED is distributed by the reflector F.

  Each light emitting diode drive circuit A is connected to a battery included in a car as a power source. Each light emitting diode drive circuit A outputs a DC voltage, controls the current value of the DC current to be output, and drives (lights) each lighting fixture B.

  In the configuration shown in FIG. 20, the supply direct current supplied to each lighting fixture B due to variations in the characteristics of the components constituting each light emitting diode drive circuit A and the variations in the characteristics of the light emitting diodes LED constituting the light emitting diode unit U are provided. The electric current may vary between the lighting fixtures B, and as described above, the luminance and the hue may vary.

  In order to reduce variations in brightness and hue, the light-emitting diode LED is selected, or a precision component is used in the light-emitting diode drive circuit A to improve the accuracy of current control by the light-emitting diode drive circuit A. There is a need.

On the other hand, as shown in FIG. 21, there is an illuminating device used for illumination in a vehicle interior. Although the basic configuration is the same as the configuration of FIG. 20, the lighting fixture B is used for lighting of each seat and lighting of the feet, and has a large number of units. The illuminating device shown in FIG. 21 includes a control unit H that centrally controls the operation of each light emitting diode drive circuit A. The control unit H controls the switching regulator R included in each light emitting diode drive circuit A to control the magnitude of the direct current supplied to each lighting fixture B.
JP 2006-73400 A

  In the configuration of FIG. 20, there is a problem that when the selection of the light emitting diodes LED is performed, the number of work steps is increased, and when accurate components are used, the yield decreases and the light emitting diode driving circuit A becomes expensive.

  Further, in the configuration of FIG. 21, each light-emitting diode drive circuit A is connected to each lighting fixture B. Therefore, if the number of lighting fixtures B is large, the number of feeder lines PL1 and PL2 increases accordingly, and the construction work is performed. There is a problem that (connection work) becomes difficult.

  In addition, when the distance between each lighting fixture B and the light emitting diode drive circuit A is increased, the power supply lines PL1 and PL2 become longer, and it is difficult to perform the connection work, and there is a problem that the power supply lines PL1 and PL2 become complicated.

  Furthermore, the number of light-emitting diode drive circuits A corresponding to the number of lighting fixtures B is necessary, and if the number of lighting fixtures is large, the number of light-emitting diode drive circuits A increases correspondingly, which increases the cost. .

  By the way, a light emitting diode used for a pilot lamp or the like is used with a current of about several tens of mA, but a light emitting diode used for illumination is used with a current in a range of several hundred mA to several A. Therefore, in the illumination device using a light emitting diode as a light source, there is a problem that the power (power loss) consumed by the feeder line increases. In order to reduce power loss, it is conceivable to increase the thickness of the feeder line. However, increasing the thickness of the feeder line increases the weight of the feeder line. In a lighting device used in a car, an increase in weight adversely affects fuel consumption.

  The present invention has been made in view of the above reasons, and the object thereof is to enable lighting of each lighting fixture without variation in brightness and color in a lighting device including a plurality of lighting fixtures including light emitting diodes. In addition, the lighting device, the vehicle interior lighting device, and the vehicle lighting that can reduce the cost, facilitate the wiring work, and further improve the efficiency by suppressing the power loss in the wiring including the feeder line. To provide an apparatus.

  The invention of claim 1 includes a plurality of lighting fixtures each having a light emitting diode, and a light emitting diode driving circuit that outputs a DC voltage, and the plurality of lighting fixtures are connected in series via a connection line to form a series circuit. The both ends of the series circuit of a lighting fixture and the output end of a light emitting diode drive circuit are connected through a pair of feeder lines.

  According to this configuration, since a plurality of lighting fixtures are connected in series, a direct current of the same current value is supplied to each lighting fixture, and there is an advantage that no difference in brightness occurs between the lighting fixtures. Also, since direct current of the same current value is supplied to each lighting fixture, even when a white light emitting diode using a yellow phosphor as a blue light emitting diode is used as a light source, the color changes between the lighting fixtures. There is nothing.

  Also, since multiple light fixtures are driven (lighted) by one light emitting diode drive circuit, the light emitting diodes are driven rather than the conventional configuration in which multiple light fixtures are driven (lighted) by multiple light emitting diode drive circuits, respectively. There is an advantage that the number of circuits can be reduced and the cost can be reduced.

  Furthermore, since the light emitting diode drive circuit and the series circuit of the luminaire are connected by a pair of power supply lines, and the luminaires are connected by a connection line, wiring required for driving each luminaire (feed line and connection line) ) Is a value obtained by adding 1 to the number of lighting fixtures (two power lines and one connecting line minus the number of lighting fixtures). In the conventional configuration, the number of necessary wirings (feed lines) is a value obtained by multiplying the number of lighting fixtures by two. Therefore, the number of wirings is smaller than that in the conventional configuration. Since the number of wirings is reduced, there is an advantage that wiring work becomes easier than the conventional configuration. Further, since the number of wirings is small, the total length of the wirings is usually smaller than that of the conventional configuration, and the power loss consumed by the wirings is reduced, so that the lighting efficiency can be improved. .

  The invention of claim 2 controls the on-duty of the dimming switching element provided between the light emitting diode driving circuit and the series circuit of the lighting fixture and the dimming switching element in the invention of claim 1. And a dimming control circuit.

  According to this configuration, since the dimming control circuit to which the dimming signal is input changes the on-duty of the dimming switching element according to the dimming signal, it can be dimmed by the dimming signal. There are advantages.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a plurality of extinguishing switches connected in parallel to the respective lighting fixtures are provided.

  According to this configuration, since each lighting fixture can be turned off by turning on each turn-off switch, each lighting fixture can be turned on and off individually, and there is an advantage that convenience is good. .

  According to a fourth aspect of the present invention, in the invention according to the first or second aspect, the switch for extinguishing light connected in parallel to each of the other lighting fixtures excluding at least one of the lighting fixtures. It is characterized by providing.

  According to this configuration, by turning on the extinguishing switch, it is possible to extinguish the lighting fixtures connected in parallel to the extinguishing switch. Therefore, the lighting fixtures connected in parallel to the extinguishing switch are individually turned on and off. Can be convenient. Further, even if all the extinguishing switches are turned on, the light emitting diode drive circuit will not be in a secondary short circuit state by a lighting fixture to which no extinguishing switch is connected. Since the light emitting diode driving circuit is not in the secondary short circuit state, the light emitting diode driving circuit is not turned on in the secondary short circuit state, and the safety of the light emitting diode driving circuit can be ensured. There is an advantage.

  According to a fifth aspect of the present invention, in the invention according to the third or fourth aspect, the extinguishing switch is a switching element, and includes a remote control unit that instructs on / off of the extinguishing switch.

  According to this configuration, since the remote control unit that instructs on / off of the extinguishing switch is provided, the extinguishing switch can be installed in the vicinity of the lighting fixture, and the line connecting the extinguishing switch and the lighting fixture can be shortened. it can. Therefore, there is an advantage that the power (power loss) consumed by the line connecting the switch for turning off and the wiring device is reduced, and the lighting efficiency can be increased.

  According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the light emitting diode driving circuit includes a boost chopper.

  According to this configuration, since the light emitting diode driving circuit includes the boost chopper, there is an advantage that each light emitting diode can be lit at the rated voltage even when the voltage input to the light emitting diode driving circuit is low. .

  According to a seventh aspect of the present invention, in the invention according to any one of the first to fifth aspects, the light-emitting diode driving circuit includes a power supply circuit unit that performs step-down.

  According to this configuration, since the light emitting diode driving circuit includes the power supply circuit unit that performs step-down, each light emitting diode can be lit at the rated voltage even when the voltage input to the light emitting diode driving circuit is high. There is an advantage.

  The invention according to claim 8 is the invention according to any one of claims 1 to 5, wherein the light emitting diode drive circuit includes a step-up / down converter.

  According to this configuration, since the light emitting diode driving circuit includes the step-up / step-down converter, there is an advantage that each light emitting diode can be lit at the rated voltage regardless of the magnitude of the voltage input to the light emitting diode driving circuit. .

  The invention according to claim 9 is the invention according to claim 8, wherein the step-up / down converter includes a transformer having a power supply side winding and an output side winding, and a control switching connected in series to the power supply side winding. A light-emitting diode drive circuit having a detection winding that is electromagnetically coupled to a power-supply side winding and detecting a first output voltage of the transformer. A detection unit, and a second detection unit that has a current detection resistor connected in series to the power supply side winding and detects an input current of the transformer. The first detection unit and the second detection unit are provided in the switch control unit. The switch control unit is connected, and the switching control unit controls on / off of the switching element according to the voltage detected by the first detection unit and the current detected by the second detection unit.

  According to this configuration, since the first detection unit and the second detection unit are insulated from the output side of the transformer, the switch control unit to which the first detection unit and the second detection unit are connected is connected to the output side of the transformer. Insulated from. Therefore, the switch control unit has an advantage that it can control on / off of the switching element according to the input current and the output voltage of the transformer while being insulated from the output side of the transformer.

  According to a tenth aspect of the present invention, in the invention according to any one of the first to ninth aspects, each of the lighting fixtures has a conductor portion that forms a reflective surface, and is disposed close to the light emitting diode. Each of the light-emitting diodes includes a reflector that distributes the light of the light-emitting diode, and one end of the reflector is grounded and a ground line close to the feeder line is connected to the conductor.

  According to this configuration, the ground line and the feeder line, which are grounded at one end, are parallel and close to each other, so that high-frequency noise superimposed on the direct current supplied to the series circuit of the lighting fixture is generated in the feeder line. There is an advantage that it is reduced.

  The invention of claim 11 is the illumination device according to any one of claims 1 to 10, wherein the illumination fixture is a vehicle interior illumination device installed in a vehicle interior. .

  A twelfth aspect of the present invention is the lighting device according to any one of the first to tenth aspects, wherein the lighting fixture, the light emitting diode drive circuit, the feeder line, and the connection line are installed in a vehicle. It is the vehicle lighting device used.

  The present invention provides a lighting device including a plurality of lighting fixtures, in which luminance and color do not vary between the lighting fixtures, the cost is low, the wiring work is easy, the power loss in wiring is reduced, and the efficiency is increased. The lighting device, the vehicle interior lighting device, and the vehicle lighting device can be provided.

(Embodiment 1)
In this embodiment, as shown in FIG. 1, two lighting fixtures B of the same specification used as a headlight (or daytime running lamp) of a car and one unit that drives (lights) each lighting fixture B Illuminating device for vehicles provided with the following light emitting diode drive circuit A is illustrated. The two lighting fixtures B are connected in series via the connection line CL1. Both ends of the series circuit of the luminaire B are connected to the output end of the light emitting diode drive circuit A via a pair of power supply lines PL1 and PL2.

  In the present embodiment, the vehicle lighting device is exemplified, but the present invention is not limited to this. As shown in FIG. 4, as shown in FIG. 4, a plurality of units used for lighting of each seat, lighting of the feet, lighting of the driver's seat, etc. A vehicle interior lighting device including the lighting fixture B may be used. The plurality of lighting fixtures B are connected in series via a connection line CL1, and the series circuit of the lighting fixture B is connected to the light emitting diode drive circuit A via a pair of power supply lines PL1 and PL2.

  As shown in FIG. 1, the two lighting fixtures B of the present embodiment each include a light emitting diode unit U in which a plurality of light emitting diodes LED are connected in series. The light emitting diode units U are connected in series so that the cathode of one light emitting diode LED is connected to the anode of another light emitting diode LED. However, the light emitting diode unit U may be configured by only one light emitting diode LED, and the number can be changed according to the required luminance.

  The light emitting diode unit U (the upper light emitting diode unit U in the figure) provided in one lighting fixture B has one end (the anode of the light emitting diode LED located at the end) connected to the high voltage side output end of the light emitting diode drive circuit A. The other end is connected to the connection line CL1. The light emitting diode unit U (lower light emitting diode unit U in the figure) provided in the other lighting fixture B has one end (the anode of the light emitting diode LED located at the end) connected to the connection line CL1, and the other end connected to the light emitting diode. The power supply line PL2 connected to the low-voltage side output terminal of the drive circuit A is connected.

  As shown in FIG. 5, one or a plurality of light emitting diode units U having the same configuration can be connected to the light emitting diode unit U in parallel.

  As the light emitting diode LED, a white light emitting diode using a yellow phosphor as a blue light emitting diode is used. However, light emitting diodes of other colors or white light emitting diodes of other configurations can also be used.

  As shown in FIG. 1, each lighting fixture B includes a reflector F that is formed in a bowl shape having an opening on the bottom surface and in which the light emitting diode unit U is disposed. The reflecting plate F is formed in a size such that the light emitting diode LED is close to the inner surface, and the inner surface is formed on the reflecting surface. The light of the light emitting diode LED is reflected by the inner surface (reflecting surface) of the reflecting plate F and emitted from the opening of the reflecting plate F. The reflecting plate F is disposed so that the mouth axis direction of the opening of the reflecting plate F is in front of the vehicle.

  The light emitting diode drive circuit A is connected to the power source E. The power source E is a battery mounted on the vehicle and outputs a DC voltage of about 12V, for example. However, as shown in FIG. 6, a power source E ′ that is an AC power source may be used as a power source. In that case, a DC conversion circuit G including a rectifying unit DB and a smoothing capacitor C1 is provided between the power supply E ′ and the light emitting diode driving circuit A. A diode bridge or the like is used for the rectifying unit DB.

  As shown in FIG. 2, the light emitting diode drive circuit A has a boost chopper 10 that boosts a DC voltage input from a power supply E, and a DC voltage output from the light emitting diode drive circuit A (hereinafter referred to as an output DC voltage). And a current detection unit 12 that detects a supply direct current IL supplied to the series circuit of the lighting fixture B.

  The step-up chopper 10 includes a step-up unit 101 that performs step-up and a control unit 102 that controls the step-up operation of the step-up unit 101. The booster 101 has an inductor L1 having one end connected to the high voltage side of the power source E, a diode D1 having an anode connected to the other end of the inductor L1, and a cathode of the diode D1 and a low voltage side of the power source E. A smoothing capacitor C2 to be connected and a switching element Q1 connected between the anode of the diode D1 and the low voltage side of the power source E are provided. A MOSFET or the like is used for the switching element Q1.

  As shown in FIG. 3, the control unit 102 includes a first reference voltage generation unit 1022, a second reference voltage generation unit 1023, a differential amplifier 1024 composed of an operational amplifier, two diodes D2 and D3, and two Comparators CP1 and CP2, an oscillator OSC that outputs a triangular wave, and a drive circuit 1021 that drives the switching element Q1.

  The first reference voltage generation unit 1022 includes a series circuit of voltage dividing resistors R4 and R5. In the series circuit of the voltage dividing resistors R4 and R5, the reference voltage Vref is applied to one end (the voltage dividing resistor R4 side), the other end (the voltage dividing resistor R5 side) is grounded, and the connection end is connected to the inverting input terminal of the comparator CP1. Connected.

  The second reference voltage generation unit 1023 includes a series circuit of voltage dividing resistors R6 and R7. In the series circuit of the voltage dividing resistors R6 and R7, one end (the voltage dividing resistor R6 side) is applied with the reference voltage Vref, the other end (the voltage dividing resistor R7 side) is grounded, and the connection end is the inverting input of the differential amplifier 1024. Connected to the terminal. That is, the second reference voltage generation unit 2023 divides the voltage between the constant power source Vref and the ground point to generate the second reference voltage, and the generated second reference voltage is the inverting input terminal of the differential amplifier 1024. Is input. A resistor R8 is connected between the inverting input terminal and the output terminal of the differential amplifier 1024.

  The output terminal of the comparator CP1 is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the inverting input terminal of the comparator CP2. The output terminal of the differential amplifier 1024 is connected to the anode of the diode D3, and the cathode of the diode D3 is connected to the inverting input terminal of the comparator CP2.

  The non-inverting input terminal of the comparator CP2 is connected to the oscillator OSC that outputs a triangular wave, and the output terminal is connected to the drive circuit 1021. An output terminal of drive circuit 1021 is connected to a control terminal (not shown) of switching element Q1.

  The voltage detection unit 11 included in the light emitting diode driving circuit A includes a series circuit of voltage dividing resistors R1 and R2. The series circuit of the voltage dividing resistors R1 and R2 is connected in parallel to the smoothing capacitor C2, and the connection end is connected to the non-inverting input terminal of the comparator CP1. That is, the voltage detector 11 detects the output DC voltage, and the detection value of the voltage detector 11 is input to the non-inverting input terminal of the comparator CP1.

  The current detection unit 12 includes a current detection resistor R3. One end of the current detection resistor R3 is connected to one end of the smoothing capacitor C2 (the side connected to the low voltage side of the power supply E), and the other end is connected to the feeder line PL2 and the non-inverting input terminal of the differential amplifier 1024. . That is, the current detection unit 12 detects the supplied direct current, and the detection voltage of the current detection unit 12 is input to the non-inverting input terminal of the differential amplifier 1024.

  Next, the operation of this embodiment will be described. The differential amplifier 1024 amplifies and outputs the difference between the second reference voltage input to the inverting input terminal and the detection value of the current detection unit 12 input to the non-inverting input terminal. The comparator CP2 compares the output voltage of the differential amplifier 1024 with the triangular wave output from the oscillator OSC and outputs a rectangular wave. The switch drive circuit performs PWM control by turning on and off the switching element Q1 with an on-duty corresponding to the width of the rectangular wave.

  As the detection voltage of the current detection unit 12 increases, the width of the rectangular wave decreases, the on-duty of the switching element Q1 decreases, the supply DC voltage decreases, and the detection voltage of the current detection unit 12 decreases. Further, when the detection voltage of the current detection unit 12 is decreased, the width of the rectangular wave is increased, the on-duty of the switching element Q1 is increased, the supplied DC voltage is increased, and the detection voltage of the current detection unit 12 is increased.

  Therefore, the supply DC current IL is kept at a constant value. That is, the light emitting diode driving circuit A is controlled by the control unit 102 at a constant current.

  The supplied DC current IL is set to be the rated current of the light emitting diode LED by the resistance values of the voltage dividing resistors R6 and R7 that generate the second reference voltage.

  Note that the frequency of the rectangular wave output from the comparator CP2 matches the frequency of the triangular wave output from the oscillator OSC, and the drive circuit 2011 drives the switching element Q1 at a frequency that matches the frequency of the rectangular wave. That is, the drive frequency of the switching element Q1 matches the frequency of the triangular wave. In the present embodiment, the frequency of the triangular wave is set to several hundred kHz, and the switching element Q1 is driven at a driving frequency of several hundred kHz.

  Moreover, in this embodiment, the thing of the specification into which rated current flows into light emitting diode LED is applied to the two lighting fixtures B by applying the DC voltage of 15V-25V. The light emitting diode drive circuit A boosts the voltage (about 12V) of the power source E to 30 to 50V and outputs it, thereby lighting each lighting fixture B.

  In the present embodiment, since the light emitting diode drive circuit A includes the boost chopper 10, even when the voltage of the power source E is low (12V), the voltage (30 to 50V) that can light up each light emitting diode LED at the rated voltage. Can be supplied to the series circuit of the luminaire B.

  Next, the comparator CP1 will be described. The comparator CP1 compares the first reference voltage input to the inverting input terminal with the voltage corresponding to the output DC voltage input to the non-inverting input terminal, and outputs a high level or low level voltage. When the output voltage of the comparator CP1 is at a low level, the output voltage of the comparator CP2 depends on the output voltage of the differential amplifier 1024, and the control unit 102 performs constant current control as described above.

  When the output voltage of the comparator CP1 is at a high level, the comparator CP2 outputs a low level voltage, and the switch drive circuit 1021 turns off the switching element Q1. As a result, the light emitting diode driving circuit A stops outputting.

  If disconnection occurs in the lighting fixture B, the power supply lines PL1 and PL2, or the connection line CL1, and the supply DC current IL is extremely reduced, the output DC voltage becomes too large due to constant current control, causing the light emitting diode drive circuit A to fail. There is a risk of doing. In the present embodiment, the comparator CP1 stops the operation of the light emitting diode drive circuit A in such a case. That is, the comparator CP1 is used for overvoltage prevention.

  As described above, since the stable value of the supplied DC current IL is determined by the second reference voltage, the stable value of the supplied DC current IL changes when the second reference voltage is changed. As a result, dimming can be performed. For example, as shown in FIG. 7, one end of a series circuit of a variable resistor R14 and a resistor R15 is connected to a connection end of the voltage dividing resistors R6 and R7. The other end of the series circuit of the variable resistor R14 and the resistor R15 is grounded.

  When the second reference voltage is decreased by changing the resistance value of the variable resistor R14, the output voltage of the differential amplifier 1024 increases and the width of the rectangular wave output from the comparator CP2 decreases. When the width of the rectangular wave is reduced, the ON time of the switching element Q1 is shortened and the supplied DC current IL is reduced. As a result, the brightness of the light-emitting diode LED is lowered and light control is performed.

  If a variable resistor R14 whose resistance value can be manually changed is used, the light can be adjusted by operating the variable resistor R14.

  Further, as shown in FIG. 8, the other end of the resistor R17 whose one end is grounded is connected to the inverting amplification terminal of the differential amplifier 1024, and a control voltage is directly input to the inverting input terminal of the differential amplifier 1024. However, constant current control and dimming can be performed.

  As described above, in the present embodiment, two light fixtures B can be turned on by one light emitting diode drive circuit A, and thus two light fixtures B are respectively connected by two light emitting diode drive circuits A. The number of light emitting diode drive circuits A is smaller than the conventional configuration for lighting. Since the number of light emitting diode drive circuits A can be reduced, the manufacturing cost is lower than that of the conventional configuration. As the number of lighting fixtures B increases, the manufacturing cost can be greatly reduced.

  Moreover, since the two lighting fixtures B are connected in series, the current values of the direct currents supplied to the respective lighting fixtures B are the same. Therefore, depending on the current value of the supplied direct current, there is no variation in brightness or hue between the two lighting fixtures B.

  By the way, in the present embodiment, the number of wirings (feed lines PL1, PL2 and connection line CL1) for supplying power to the light emitting diode LED is three.

  On the other hand, the number of wirings (feed lines) in the conventional configuration is four when there are two lighting fixtures. Therefore, the number of wires is smaller than that of the conventional configuration, and the construction work (connection work) is facilitated. As the number of lighting fixtures B increases, the difference in the number of wirings increases, and a greater effect is achieved.

  Further, even if the number of lighting fixtures B increases, the number of power supply lines PL1 and PL2 is only two, so that the connection work between the light emitting diode drive circuit A and the lighting fixture B becomes easier than the conventional configuration. .

  Furthermore, since the number of wires is small, the total length of wires is usually shorter than that of the conventional configuration. By shortening the total length of the wiring, the power consumed by the wiring (power loss) is reduced, and the lighting efficiency can be increased as compared with the conventional configuration. In addition, since the total length of the wiring is shortened, the weight of the wiring is reduced, and the fuel efficiency of the vehicle is improved.

  Incidentally, the reflecting plate F is formed of a conductor such as metal. As shown in FIG. 9, a ground line GL whose one end is grounded can be connected to the outer surface of each reflecting plate F (the outer surface not formed on the reflecting surface). The ground line GL is bundled together with the power supply line PL1 connected to the output terminal on the high voltage side of the light emitting diode driving circuit A. The ground lines GL are bundled so as to be close to the power supply line PL1.

  As described above, the reflector F is formed in the shape of a bowl and is disposed in the vicinity of the light emitting diode unit U, and is grounded by the ground line GL, so that high-frequency noise is absorbed by the reflector F.

  Further, since the feeder line PL1 is bundled together with the ground line GL whose one end is grounded, high-frequency noise superimposed on a direct current supplied to the series circuit of the lighting fixture B can be reduced in the feeder line PL1.

  In addition, the reflecting plate F can also be formed by covering the surface of the base material formed of a nonconductor with the conductor.

  Further, when the feeder line PL2 is grounded, the ground line GL may be connected to the feeder line PL2.

(Embodiment 2)
As shown in FIG. 10, the lighting device exemplified in the present embodiment is implemented in that the light emitting diode drive circuit A includes a forward type step-down converter 20 that is a power supply circuit unit that performs step-down instead of the step-up chopper 10. Different from Form 1.

  The step-down converter 20 includes a step-down unit 201 and a control unit 202. The step-down unit 201 includes a transformer 2011, a switching element Q2, two diodes D4 and D5, an inductor L2, and a smoothing capacitor C3. The transformer 2011 includes a power supply side winding 2011a that is connected to the high voltage side of the power supply E and wound around the core 2011c, and an output side winding 2011b wound around the core 2011c.

  A switching element Q2 is connected between one end of the power supply side winding 2011a and the low voltage side of the power supply E. A MOSFET or the like is used for the switching element Q2. One end of the output side winding 2011b is connected to the low voltage side of the power source E, and the other end is connected to the anode of the diode D4. The cathode of the diode D4 is connected to the cathode of the diode D5, and the anode of the diode D5 is connected to the low voltage side of the power supply E.

  The cathode of the diode D4 is connected to one end of the inductor L2, and a smoothing capacitor C3 is connected between the other end of the inductor L2 and the low voltage side of the power source E.

  The configuration of the control unit 202 is basically the same as the configuration of the control circuit 102, except that the comparator CP1 and the first reference voltage generation unit 1022 (see FIG. 3) are not provided.

  When the switching element Q2 is turned on and off, the DC voltage output from the power source E is stepped down by the step-down unit 201 and supplied to the lighting fixture B. At this time, the control unit 202 performs constant current control in the same manner as described above using the supplied DC current IL detected by the current detection unit 12.

  In the present embodiment, even when the DC voltage output from the power source E is higher than the DC voltage necessary for lighting each lighting fixture B (voltage that applies the rated voltage to each light emitting diode LED), the light emitting diode driving circuit A is the power source. By reducing the DC voltage output by E, each light emitting diode LED can be lit at the rated voltage.

  Other configurations in the present embodiment are the same as those in the first embodiment.

(Embodiment 3)
As illustrated in FIG. 11, the illumination device exemplified in the present embodiment is different from the second embodiment in that a step-down chopper 20 ′ is provided as a power supply circuit unit that performs step-down instead of the step-down converter 20.

  The step-down chopper 20 'includes a step-down unit 203 and a control unit 202'. The step-down unit 203 includes a switching element Q3, a diode D6, an inductor L3, and a smoothing capacitor C4.

  One end of the switching element Q3 is connected to the high voltage side of the power source E, and the other end is connected to one end of the inductor L3. A smoothing capacitor C4 is connected between the other end of the inductor L3 and the low voltage side of the power source E. The cathode of the diode D6 is connected to one end of the switching element Q3 (one end connected to the inductor L3), and the anode is connected to the low voltage side of the power source E.

  When the switching element Q3 is turned on and off, the DC voltage output from the power source E is stepped down by the step-down unit 203 and supplied to the lighting fixture B. The configuration of the control unit 202 ′ is the same as that of the control unit 202, and constant current control is performed in the same manner as described above by the supply DC current IL detected by the current detection unit 12.

  In the present embodiment, even if the DC voltage output from the power source E is higher than the DC voltage required for lighting each lighting fixture B (voltage that applies the rated voltage to each light emitting diode LED), the light source is driven by the light emitting diode driving circuit A. The DC voltage output from E can be stepped down and supplied to the series circuit of the lighting fixture B.

  Other configurations in the present embodiment are the same as those in the second embodiment.

(Embodiment 4)
In the present embodiment, as shown in FIG. 12, a vehicle interior lighting device including a plurality of lighting fixtures used for lighting a vehicle seat, lighting a foot, or the like is illustrated. The plurality of lighting fixtures B are connected in series by a connection line CL2 to form a series circuit of the lighting fixture B, and the series circuit of the lighting fixture B is connected to the light emitting diode drive circuit A by a pair of feed lines PL1 and PL2. Is done. Although the basic structure of the lighting fixture B is the same as that of Embodiment 1, it is different in that it does not have a reflector F because it is for a vehicle interior.

  The basic configuration of the light-emitting diode drive circuit A is the same as that of the light-emitting diode drive circuit A of the first embodiment, except that a flyback converter 30 that is a step-up / step-down converter is provided instead of the step-up chopper 10.

  The flyback converter 30 includes a step-up / step-down unit 301 and a control unit 302. The step-up / step-down unit 301 includes a flyback transformer 3011, a diode D7, a smoothing capacitor C5, and a switching element Q4. A MOSFET or the like is used for the switching element Q4.

  The flyback transformer 3011 has one end connected to the high voltage side of the power source E and a power source side winding 3011a wound around the core 3011c, and is spaced apart from the power source side winding 3011a and opposite to the power source side winding 3011a. And an output side winding 3011b wound around the core 3011c. One end of the output side winding 3011b is connected to the low voltage side of the power source E.

  The other end of the power supply side winding 3011a is connected to one end of the switching element Q4, and the other end of the switching element Q4 is connected to the low voltage side of the power supply E.

  The other end of the output side winding 3011b is connected to the anode of the diode D7. The cathode of the diode D7 is connected to one end of the smoothing capacitor C5, and the other end of the smoothing capacitor C5 is connected to the low voltage side of the power source E.

  When the switching element Q4 is turned on, a direct current flows through the power supply side winding 3011a and magnetic energy is stored in the power supply side winding 3011a. When the switching element Q4 is turned off, a DC voltage having a magnitude corresponding to the magnetic energy stored in the power supply side winding 3011a is output. Since the magnetic energy stored in the power supply side winding 3011a depends on the ON time of the switching element Q4, the output voltage of the flyback converter 30 can be changed by changing the ON duty of the switching element Q2. That is, the flyback converter 30 can perform step-up / step-down.

  The controller 302 controls on / off of the switching element Q4. The configuration of the control unit 302 is the same as the configuration of the control unit 102 of the first embodiment, and the control unit 302 performs constant current control.

  In the present embodiment, the flyback converter 30 steps up and down the DC voltage output from the power source E, so that each light emitting diode LED can be lit at the rated voltage regardless of the voltage level of the power source E.

(Embodiment 5)
As illustrated in FIG. 13, the illumination device exemplified in the present embodiment includes a first detection unit 31 instead of the voltage detection unit 11 (see FIG. 12), and includes a first detection unit 12 (see FIG. 12). The point provided with the 2 detection part 32 differs from Embodiment 4. FIG.

  The first detector 31 includes a detection winding 311 wound around the core 3011c, a diode D8 having an anode connected to one end of the detection winding 311, a cathode of the diode D8, and the detection winding 311. And a smoothing capacitor C6 having both ends connected to the ends. One end of the detection winding 311 (the end to which one end of the smoothing capacitor C6 is connected) is grounded.

  The configuration of the first detection unit 31 is the same as the configuration of the output side of the flyback converter 30 (configuration of the output side winding 3011b, the diode D4, and the smoothing capacitor C3). The voltage according to is output. One end of the smoothing capacitor C4 (the side connected to the cathode of the diode D5) is connected to the control unit 302 which is a switch control unit.

  The second detection unit 32 includes a current detection resistor R16 connected between the switching element Q4, which is a control switching element, and the low-voltage side of the power source E. That is, the current detection resistor R16 is connected in series with the power supply side winding 3011a.

  One end of the current detection resistor R9 (the side connected to the switching element Q4) is connected to the control unit 302. That is, the first detection unit 31 detects the input current of the flyback converter 30, and the detection voltage detected by the first detection unit 31 is input to the control unit 302.

  The control unit 302 performs constant current control by the current detected by the second detection unit 32 in the same manner as described above, and controls the power supply lines PL1, PL2 and the like by the voltage detected by the first detection unit 31 in the same manner as described above. When the disconnection occurs, the operation of the light emitting diode drive circuit A is stopped.

  In the present embodiment, as described above, since the first detection unit 31 and the second detection unit 32 are insulated from the output side of the flyback converter 30, the control unit 302 is also connected from the output side of the flyback converter 30. Insulated. Therefore, even when the number of lighting fixtures B is large and the output voltage of the light emitting diode drive circuit A is high, the safety of the control unit 302 is ensured.

(Embodiment 6)
As shown in FIG. 14, the lighting device exemplified in the present embodiment includes a dimming switching element Q5 provided between the light emitting diode drive circuit A and the series circuit of the lighting fixture B, and a dimming switching element Q5. It differs from the configuration of the second embodiment in that it includes a dimming control circuit 40 that controls on / off. A MOSFET or the like is used as the dimming switching element Q5.

  The dimming control circuit 7 receives a dimming signal from the outside, and controls the on / off of the dimming switching element Q5 according to the dimming level instructed in the dimming signal, as shown in FIG. The signal is output. The on-duty of the dimming switching element Q5 changes in accordance with the width of the rectangular wave, and the time average value of the current supplied to the series circuit of the lighting fixture B changes to perform dimming.

  More specifically, assuming that the light emitting diode LED is lit at the rated current when the width of the rectangular wave is t1, the time average value of the supplied DC current IL is reduced by reducing the width of the rectangular wave from t1 to t2. To reduce the brightness of the light emitting diode LED.

  The frequency f of the rectangular wave (f = 1 / T, T is the period of the rectangular wave) is set to 100 Hz to several kHz in order to suppress flicker and noise.

  Therefore, as shown in FIG. 14, the driving frequency (several hundred kHz) of the switching element Q2 (see FIG. 10) is higher than the driving frequency of the dimming switching element Q5, and the dimming switching element Q5 is off. In addition, the switching element Q2 is turned on and off.

  While the dimming switching element Q5 is off, the switching element Q2 is turned on and off to perform constant current control. When the switching element Q2 is turned on, the supplied direct current IL is temporarily changed by the discharge current of the smoothing capacitor C3. When it becomes larger, the capacity of the smoothing capacitor C3 is reduced to shorten the time during which the large supply DC current IL flows, thereby reducing the burden on the light emitting diode drive circuit A.

  Other configurations of the present embodiment are the same as those of the second embodiment. In addition, it can also be set as the structure which adds the switching element Q5 for light control and the control circuit 40 for light control to Embodiment 1 and Embodiment 3-5.

(Embodiment 7)
The illuminating device illustrated in the present embodiment is an illuminating device installed in a vehicle interior, and as shown in FIG. 16, the number of lighting fixtures B (four in the illustrated example) is the same as the number (four in the illustrated example). The difference from the configuration of the sixth embodiment is that a switch SW is provided.

  A push button switch or the like is used as the switch SW for turning off. Each turn-off switch SW is connected in parallel to each lighting fixture B using a switch connection line CL2. When the turn-off switch SW is turned on, no current is supplied to the luminaire B connected in parallel to the turn-off switch SW, and the light is turned off. That is, each turn-off switch SW can switch each lighting fixture B on and off. A driver or a passenger can turn on or turn off each lighting fixture B individually by operating the switch SW for turning off.

  Other configurations of the present embodiment are the same as those of the sixth embodiment. In addition, the switch SW for extinguishing can also be added to the structure of Embodiment 1-5.

(Embodiment 8)
As shown in FIG. 17, the lighting device exemplified in the present embodiment is different from the configuration of the seventh embodiment in that there is a lighting fixture B (the lowest lighting fixture B in the drawing) to which the switch SW for turning off is not connected. Different. A power switch 3 is connected between the high voltage side of the power source E and the light emitting diode drive circuit A.

  Since there is a lighting fixture B to which the switch SW for extinguishing is not connected, the output side of the light emitting diode drive circuit A will not be short-circuited (secondary short-circuited) even if all the switches for extinction SW are on . Therefore, when the power switch 3 is turned on and power is turned on, the light emitting diode driving circuit A is not in the secondary short circuit state, and the safety of the light emitting diode driving circuit A is ensured.

  By the way, if the amount of electric power output from the light emitting diode driving circuit A is large, the burden on the light emitting diode driving circuit A is large, and the light emitting diode driving circuit A may be broken.

  Therefore, in the present embodiment, in order to regulate the output power amount of the light emitting diode drive circuit A, a function of changing the magnitude of the supplied DC current IL according to the magnitude of the output DC voltage V is provided.

  Specifically, the light emitting diode drive circuit A includes a current limiting circuit (not shown) that limits the output current when the output DC voltage V increases. As shown in FIG. 18A, the output DC voltage V is changed from the normal state V1 (the supplied DC current is I1) in which the rated voltage is applied to each light emitting diode LED to the voltage V2 that increases the burden on the light emitting diode driving circuit A. Then, the supply direct current IL is limited by the current limiting circuit.

  Further, a voltage adjusting circuit (not shown) for reducing the second reference voltage in proportion to the magnitude of the output DC voltage V is provided in the light emitting diode driving circuit A, and as shown in FIG. The supply direct current IL can be gradually decreased as V increases.

  In FIGS. 18A and 18B, when the output DC voltage becomes Vmax (> V2), the operation of the light emitting diode drive circuit A is stopped by the comparator CP1 (see FIG. 3) as described above.

  A function for reducing the burden on the light emitting diode drive circuit A as described above can be added to the first to seventh embodiments.

  Other configurations of the present embodiment are the same as the configurations of the seventh embodiment.

(Embodiment 9)
As shown in FIG. 19, the lighting device exemplified in the present embodiment is provided with a plurality of (three in the illustrated example) switch-off switches 50 and a remote control unit 60 instead of the switch-off switch SW. Different from the sixth embodiment.

  Each turn-off switch unit 50 includes a switching element Q6 that is a turn-off switch, a series circuit of voltage dividing resistors R9 and R10 connected to the switching element Q6, a switching element Q7, and a voltage division connected to the switching element Q7. And a series circuit of resistors R11 and R12.

  In the present embodiment, a PNP bipolar transistor is used for the switching element Q6. The switching element Q6 is connected to each lighting fixture B in parallel. Specifically, the emitter is connected to one end of the light emitting diode unit U (one end of the light emitting diode LED located at the end and the cathode is connected to the other light emitting diode LED). The collector is connected to the other end of the light emitting diode unit U.

  In the series circuit of the voltage dividing resistors R9 and R10, one end (the voltage dividing resistor R9 side) is connected to the emitter of the switching element Q6, and the connection end is connected to the base of the switching element Q6.

  An NPN bipolar transistor is used as the switching element Q7. Switching element Q7 has a collector connected to one end (voltage dividing resistor R9 side) of a series circuit of voltage dividing resistors R9 and 10, and an emitter connected to power supply line PL2.

  The resistance values of the voltage dividing resistors R9 and R10 are set to such values that when the switching element Q7 is turned on, the switching element Q6 is also turned on.

  In the series circuit of the voltage dividing resistors R11 and 12, one end (the voltage dividing resistor R12 side) is connected to the emitter of the switching element Q7, and the connection end is connected to the base of the switching element Q7.

  The remote control unit 60 is installed in a driver's seat or the like. The remote operation unit 60 has the number of operation switches 61 (three in the illustrated example) corresponding to the number of the switch-off switches 50 (three in the illustrated example), one end of the operation switch 61, and both ends of the power supply Vcc. And a plurality (three in the illustrated example) of resistors R13 to be connected. The other end of each operation switch 61 is connected to one end (resistor R11 side) of a series circuit of the voltage dividing resistors R11 and R12 through the signal line SL.

  A push button switch or the like is used as the operation switch 61 and is operated by a driver or the like. When the operation switch 61 is turned on, the voltage between the power supply Vcc and the power supply line PL2 is divided by the voltage dividing resistors R11 and R12 and input to the base of the switching element Q7, and the switching element Q7 is turned on.

  When the switching element Q7 is turned on, the switching element Q6 is also turned on as described above, and the lighting fixture B to which the switching element Q6 is connected is turned off. Therefore, each lighting switch B can be turned on and off by operating each operation switch 61.

  Note that the remote control unit 60 may directly control the on / off of the switching element Q6 without using the switching element Q7.

  Moreover, the light extinction switch part 50 can also be comprised with the latch relay which can hold | maintain on-off.

  In the present embodiment, since the switching element Q6 that is a switch for turning off can be operated by the remote control unit 60, the switching element Q6 can be installed near the lighting fixture B, and as a result, the switch connection line CL2 is connected. Can be shortened. That is, the switch connection line CL2 is shorter than the configuration in which the switch connection line CL2 is extended and the switch for turning off the light is installed near the driver's seat and the driver directly operates the switch for turning off the light.

  Therefore, the power consumed by the switch connection line CL2 (power loss) is small, and the lighting efficiency can be increased.

  When a vehicle lighting device such as a headlamp and a vehicle interior lighting device such as a seat lighting are installed in one vehicle, each lighting device B provided in each lighting device emits one light. It can be configured to be driven by the diode drive circuit A. Further, the light-emitting diode driving circuit A of each lighting device can be formed on the same substrate.

1 is a circuit diagram of Embodiment 1. FIG. It is a circuit diagram of the light emitting diode drive circuit same as the above. It is a circuit diagram of a control part same as the above. It is a circuit diagram of another form same as the above. It is a part of circuit diagram of another form same as the above. It is a circuit diagram of another form same as the above. It is a circuit diagram of another form same as the above. It is a circuit diagram of another form same as the above. It is a circuit diagram of another form same as the above. FIG. 6 is a circuit diagram of a second embodiment. FIG. 6 is a circuit diagram of a third embodiment. FIG. 6 is a circuit diagram of a fourth embodiment. FIG. 9 is a circuit diagram of a fifth embodiment. FIG. 10 is a circuit diagram of a sixth embodiment. It is an output waveform of the switching element for light control same as the above. FIG. 10 is a circuit diagram of the seventh embodiment. FIG. 10 is a circuit diagram of an eighth embodiment. It is a figure showing the relationship between the direct current voltage which a light emitting diode drive circuit same as the above outputs, and the time average value of the direct current supplied to the series circuit of a lighting fixture. 10 is a circuit diagram of Embodiment 9. FIG. It is a circuit diagram of a conventional example. It is a circuit diagram of another conventional example.

Explanation of symbols

10 Step-up chopper 20 Step-down converter (power supply circuit)
20 'Step-down chopper (power supply circuit)
30 Flyback converter 40 Dimming control circuit 50 Switch-off switch unit 60 Remote control unit 202 Control unit (switch control unit)
302 Control unit (switch control unit)
311 Detection winding 3011a Power supply side winding 3011b Output side winding A Light emitting diode drive circuit B Lighting fixture F Reflector Q4 Switching element (switching element for control)
Q5 Dimming switching element Q6 Switching element (light-off switch)
SW OFF switch LED Light-emitting diode PL1, PL2 Feed line CL1 Connection line

Claims (12)

  1.   A plurality of lighting fixtures each having a light-emitting diode and a light-emitting diode driving circuit that outputs a DC voltage are provided, and the plurality of lighting fixtures are connected in series via a connection line to form a series circuit. An illumination device, wherein both ends of the circuit and an output end of the light emitting diode driving circuit are connected via a pair of power supply lines.
  2.   A dimming switching element provided between the light emitting diode driving circuit and a series circuit of the lighting fixture, and a dimming control circuit for controlling an on-duty of the dimming switching element. Item 2. The lighting device according to Item 1.
  3.   The lighting device according to claim 1, further comprising: a plurality of extinguishing switches connected in parallel to the respective lighting fixtures.
  4.   3. The lighting device according to claim 1, further comprising an extinguishing switch connected in parallel to each of the other lighting fixtures excluding at least one lighting fixture among the plurality of lighting fixtures.
  5.   The lighting device according to claim 3 or 4, wherein the extinguishing switch is a switching element and includes a remote control unit that instructs on / off of the extinguishing switch.
  6.   The lighting device according to claim 1, wherein the light emitting diode driving circuit includes a step-up chopper.
  7.   The lighting device according to claim 1, wherein the light emitting diode driving circuit includes a power supply circuit unit that performs step-down.
  8.   The lighting device according to claim 1, wherein the light emitting diode drive circuit includes a step-up / down converter.
  9.   The step-up / down converter includes a transformer having a power supply side winding and an output side winding, a control switching element connected in series to the power supply side winding, and a switch control unit for controlling on / off of the control switching element; The light emitting diode drive circuit includes a first detection unit that has a detection winding electromagnetically coupled to the power supply side winding and detects the output voltage of the transformer, and a current detection connected in series to the power supply side winding And a second detector for detecting the input current of the transformer, the first detector and the second detector are connected to the switch controller, and the switch controller is detected by the first detector The lighting device according to claim 8, wherein on / off of the switching element is controlled according to the voltage and the current detected by the second detection unit.
  10.   Each of the lighting fixtures includes a reflection plate that has a conductor portion that forms a reflection surface and is disposed in the vicinity of the light emitting diode and distributes light from the light emitting diode, and one end of the conductor portion is grounded. The lighting device according to any one of claims 1 to 9, wherein a ground line close to the power supply line is connected to the lighting device.
  11.   The lighting device according to any one of claims 1 to 10, wherein the lighting fixture is installed in a vehicle interior.
  12.   11. The lighting device according to claim 1, wherein the lighting fixture, the light emitting diode driving circuit, the power feeding line, and the connection line are installed in a vehicle. Vehicle lighting device.
JP2008217427A 2008-08-26 2008-08-26 Lighting device, vehicle interior lighting device, vehicle lighting device Active JP5624269B2 (en)

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