Source: https://patents.google.com/patent/JP2004253364A/en
Timestamp: 2020-02-17 01:09:25
Document Index: 257587694

Matched Legal Cases: ['arts 11', 'arts 11', 'art 13', 'art 139', 'art 14', 'art 14']

JP2004253364A - Lighting system - Google Patents
JP2004253364A
JP2004253364A JP2003277052A JP2003277052A JP2004253364A JP 2004253364 A JP2004253364 A JP 2004253364A JP 2003277052 A JP2003277052 A JP 2003277052A JP 2003277052 A JP2003277052 A JP 2003277052A JP 2004253364 A JP2004253364 A JP 2004253364A
JP2003277052A
憲保 谷本
2003-07-18 Application filed by Matsushita Electric Ind Co Ltd, 松下電器産業株式会社 filed Critical Matsushita Electric Ind Co Ltd
2004-09-09 Publication of JP2004253364A publication Critical patent/JP2004253364A/en
<P>PROBLEM TO BE SOLVED: To provide a lighting system in which stabilization of luminous intensity of the LED bear chip in the LED module can be realized and exchange to the LED module of different specification and extension of the LED module can be implemented easily. <P>SOLUTION: In the module socket 20, a spacing between a connector 21 and a connector 22 is connected by a wiring and three LED modules 11, 12, 13 are connected to the constant voltage circuit unit 40 in parallel through this wiring. Each of the LED modules 11, 12, 13 is constructed of constant current circuit parts 11a, 12a, 13a and LED mounting parts 11b, 12b, 13b. The constant current circuit part 13a is constructed of one resistive element 133 and two transistor elements 134, 135 which are mounted on the surface of a sub substrate 131 formed with a conductive land 132. The sub substrate 131 is adhered to the main substrate. <P>COPYRIGHT: (C)2004,JPO&NCIPI
The present invention relates to a lighting device, and more particularly to a lighting device using a light emitting diode as a light source.
In recent years, lighting devices using light-emitting diodes (hereinafter, referred to as “LEDs”) have been developed, and some of them are being put to practical use.
As an illumination device using LEDs (hereinafter, referred to as “LED illumination device”), for example, an LED bare chip is mounted on a substrate (LED module), and power is supplied from a power supply source to the LED bare chip to emit light. That is mentioned. And, since a sufficient amount of light for illumination cannot be obtained by mounting only one LED bare chip on the substrate, a plurality of LED bare chips are generally mounted. The LED bare chips are mounted at a high density in order to reduce the size of the device.
In the LED lighting device having such a configuration, a metal base substrate having a higher thermal conductivity than a resin substrate is used in consideration of the property that the LED bare chip is rapidly deteriorated by heat generated by the LED bare chip when the LED is turned on. It is also being considered. The metal base substrate is a substrate having a laminated structure of a metal layer and an insulating layer (resin layer), and has a thermal conductivity of about 1 to 10 (W / m · K).
Further, in an LED lighting device, constant-current controlled power is supplied from a power supply source in order to stabilize the luminous intensity of the LED bare chip during light emission driving (Patent Document 1).
In the lighting device, when the life of the LED module has expired, it is necessary to replace the LED module. At this time, the specification of the LED module to be used for replacement changes, which causes a problem that the specification differs from the current module specification.
That is, LEDs have a much longer life than conventionally used incandescent lamps and the like, and in the field of LEDs that are being developed every day, the specifications of the LED module to be replaced (for example, Vf of LED bare chip) are changed. It is hard to imagine that it is the same as when designing the lighting device.
However, as described in the device using the circuit of Patent Document 1, the circuit configuration is different from the LED module and the circuit, and the circuit includes a converter circuit and a constant current circuit.
In the case of this circuit, when the number of LED modules increases to the parallel side, there is only one feedback signal of the converter circuit, and the reference main LED module is limited to one even if the number of LED modules increases.
That is, the control is heavily dependent on the connected LED module for extracting the feedback signal, and the other subordinate LED modules are dominant and are not optimal for the individual LED modules. For this reason, in this device, when replacing the LED module, it is preferable to use an LED module having the same characteristics (specifications).
If the unit constituted by the latest LED module is replaced as the main LED module, the performance of the subordinate LED module is reduced. Similarly, when the sub LED module is replaced, the performance of the replaced sub LED module is reduced.
As described above, according to Patent Literature 1, it is difficult to compensate for differences in LED performance between LED modules, and it is difficult to maximize the performance of each LED module.
For this reason, in these devices, in order to maintain the performance of the LED module, it is necessary to re-produce or stock the LED module of the specification at the time of replacement at the time of replacement, and use it. It means that it is not possible to replace it with the latest LED module which has superiority in performance.
JP 2001-215913 A
The present invention has been made in view of the above-described problems, and can stabilize the luminous intensity of an LED bare chip in an LED module, and can replace an LED module with a different specification and replace the LED module. It is an object of the present invention to provide a lighting device that can be easily expanded.
In order to achieve the above object, a lighting device according to the present invention includes an LED module having a light emitting diode bare chip and a power supply terminal for receiving power supply from a power supply source side on a main surface of a main board. A luminous intensity stabilizing circuit electrically connected to the diode bare chip is further provided.
In this lighting device, since a luminous intensity stabilizing circuit including a constant current circuit is provided in a power supply path for supplying power to the LED bare chip of the LED module, the luminous intensity of the LED bare chip can be stabilized during light emission driving. Can be achieved.
Further, in this lighting device, since the luminous intensity stabilizing circuit is provided in the LED module, the luminous intensity stabilizing circuit such as a constant current circuit may not be provided on the power supply side for supplying power to the LED module. The LED bare chip can emit light at the luminous intensity determined.
Also, for example, if the LED module of the device is made detachable, a luminous intensity stabilizing circuit corresponding to the specification of the LED bare chip mounted on the new LED module can be provided even when the LED module is replaced with a new one. If this is the case, the LED bare chip can emit light with a similarly stable luminous intensity.
Further, in the lighting device of the present invention, the LED module can be easily expanded.
Therefore, in the lighting device of the present invention, the luminous intensity of the LED bare chip in the LED module can be stabilized, and for example, when the LED module of the device is made detachable, the LED module can be replaced with an LED module having a different specification and the LED module can be replaced. In addition, in the above-described lighting device, when a constant current circuit is employed as the luminous intensity stabilizing circuit, power controlled at a constant current can be supplied to the LED bare chip, so that the LED bare chip emits light. It is desirable from the aspect of stabilizing the luminous intensity. In particular, by supplying constant-voltage controlled power from a power supply source to the constant current circuit of the LED module, the luminous intensity of the LED bare chip can be stabilized with higher accuracy.
In the above-mentioned lighting device, when the constant current circuit is provided, a die bonding method using silver paste, a method of attaching a sub-substrate in which the constant current circuit is formed in advance to a main substrate (metal base substrate), or the like is adopted. Can be. In particular, when a method using a sub-substrate is adopted, a constant current circuit can be formed on the main substrate without causing an increase in manufacturing cost.
In order to mount the LED bare chip on the conductive land provided on the insulating layer of the metal base substrate, FCB (flip chip bonding) by an ultrasonic bonding method or the like is generally used. Must be kept clean, and the reflow method cannot be used to mount electronic components for a constant current circuit.
On the other hand, if the constant current circuit is provided on the sub-board, the reflow method can be used for mounting the electronic components on the sub-board.
A material such as resin, ceramic, or Si can be used for the sub-substrate.
In the above lighting device, a single LED module may be provided, or a plurality of LED modules may be provided. In particular, when a plurality of LED modules are provided, a plurality of LED modules are provided to a power supply source. Are connected in parallel, it is possible to easily add LED modules. That is, in the lighting device of the present invention, the LED module can be easily expanded.
In this case, the configurations of the plurality of LED modules may be the same in that a constant current circuit is provided in each module, and the number of mounted LED bare chips does not necessarily have to be the same.
Furthermore, if the LED module is configured to be detachable from the socket connected to the power supply source, the replacement of the LED module during the life of the LED bare chip is facilitated, which is desirable in terms of workability.
Further, in the lighting device, since a substrate having a laminated structure of an insulating layer and a metal layer, that is, a so-called metal base substrate is used as a main substrate included in the LED module, compared with a case where a substrate made of only a resin is used. In addition, the heat generated from the LED bare chip can be efficiently released at the time of the light emission driving, which is effective in suppressing the deterioration of the LED bare chip due to the heat.
Further, in the above-mentioned lighting device, a heat-sensitive element (for example, a thermistor or the like) is arranged in the vicinity of the area where the LED bare chip of the LED module is mounted, and this heat-sensitive element is connected to a luminous intensity stabilizing circuit, so that the LED is connected. When the temperature of the bare chip becomes equal to or higher than a preset temperature, the supply current to the LED bare chip can be reduced.
It is preferable that the supply current can be adjusted according to the temperature of the LED bare chip in order to extend the life of the LED bare chip.
Further, in the lighting device, in the LED module, near the region where the light emitting diode bare chip is mounted, an abnormality detecting unit that detects an abnormality of the light emitting diode bare chip is arranged, and the constant voltage circuit is A control unit that reduces or stops a current supplied to the LED module when the abnormality detection unit detects an abnormality of the light emitting diode bare chip, or in the LED module, the light emitting diode bare chip includes a plurality of light emitting diode bare chips. In these light emitting diode bare chips, a plurality of series groups connected in series are connected in parallel, and a current detection unit is connected to each series group, and the constant voltage circuit If the amount of current detected by the detection unit is abnormal, the supply current to the LED module is reduced. Others characterized in that it comprises a control unit to stop. Therefore, the LED bare chip does not continue to emit light in an abnormal state, which is preferable for safety.
Further, in the above-mentioned lighting device, it is desirable that the Zener diode is provided in parallel with the LED bare chip in the LED module in that the LED bare chip can be protected from static electricity.
In the lighting device of the present invention, an LED module including a light emitting diode bare chip and a power supply terminal for receiving power from the power supply source side on the main surface of the main board is electrically connected between the power supply terminal and the light emitting diode bare chip. A light intensity stabilizing circuit connected to the LED module is further provided, so that the emission luminous intensity of the LED bare chip can be stabilized and the specification of the LED bare chip mounted on the LED module is supported. A luminous intensity stabilizing circuit can be provided. Therefore, the LED module can be replaced without limiting the specifications of the mounted LED bare chip, and the LED module can be easily expanded.
Therefore, in the lighting device of the present invention, the luminous intensity of the LED bare chip in the LED module can be stabilized, and the LED module can be easily replaced with an LED module having a different specification and the LED module can be easily expanded.
An overall configuration of an LED lighting device 1 according to an embodiment of the present invention will be described with reference to FIGS. 1, 2, and 3. FIG. FIG. 1 is a perspective view of a main part of the LED lighting device 1, FIG. 2 is a partial sectional view thereof, and FIG. 3 is a block diagram showing a circuit configuration.
As shown in FIG. 1, the LED lighting device 1 includes three LED modules 11, 12, 13, a module socket 20 into which these can be loaded, and a radiator plate 30 attached to the back of the module socket 20. I have.
Further, although not shown in FIG. 1, it has a constant voltage circuit unit connected to a power supply source, and a lead wire 41 following this is connected to a connector 42. The connector 42 is inserted into the female connector 21 provided in the module socket 20.
The LED modules 11, 12, and 13 are connected to wirings 23 and 24 (not shown in FIG. 1) in the module socket 20 via connection terminals (terminals 136 and 137 in the LED module 13, respectively). I have.
The module socket 20 is entirely made of a metal frame such as stainless steel, and has magazine portions 20a, 20b, and 20c for loading the LED modules 11, 12, and 13.
Further, the module socket 20 has two connectors 21 and 22. One connector 21 can receive the connector 42 connected to the lead wire 41 from the constant voltage circuit unit as described above. I have. The connectors 21 and 22 are connected by wires 23 and 24 (not shown in FIG. 1) in the module socket 20.
The other connector 22 is used to expand the LED module. That is, in the LED lighting device 1, it is possible to add a module socket via the connector 22.
When the LED modules 11, 12, and 13 are loaded into the magazine portions 20a, 20b, and 20c, respectively, the LED modules 11, 12, and 13 are slid in such a manner that both sides of the LED modules 11, 12, and 13 are fitted into the side grooves. Push it in the lower left direction.
When completely loaded in the magazines 20a and 20b like the LED modules 11 and 12 in the drawing, each connection terminal is configured to be connected to the terminal provided in the module socket. .
Specifically, as shown in FIG. 2, when the LED module 12 is loaded in the magazine portion 20b, the connection terminals 127 of the LED module 12 and the terminals 25 of the module socket 20 come into contact with each other, and the electrical connection state is established. Become.
A part of the terminal 25 is formed in a “<” shape, and presses the connection terminal 127 when the LED module 12 is loaded. As a result, the LED module 12 is not easily detached from the module socket 20 due to its own weight or the like.
In FIG. 2, the connection between the terminal 25 connected to the wiring 24 and the connection terminal 127 of the LED module 12 among the wirings 23 and 24 is shown, but another connection terminal in the LED module 12 or The connection terminals of the other LED modules 11 and 13 are also connected to the terminals provided at the back of the magazine portions 20a and 20b of the module socket 20 (not shown in FIG. 2).
Returning to FIG. 1, the radiator plate 30 is for releasing heat generated from the LED bare chips of the LED modules 11, 12, and 13 during light emission driving. For example, screws 31, 32, 33, and 34 are used to release the module socket 20. It is attached to the back side of.
Next, a circuit configuration of the LED lighting device 1 will be described with reference to FIG.
As shown in FIG. 3, the constant voltage circuit unit 40 connected to a power supply source 50 such as a commercial power supply is connected to the module socket 20 via a connector 42. In the module socket 20, the three LED modules 11, 12, and 13 are connected to the constant voltage circuit unit 40 in parallel.
Each of the LED modules 11, 12, 13 includes a constant current circuit section 11a, 12a, 13a and an LED mounting section 11b, 12b, 13b.
Note that each of the LED modules 11, 12, and 13 is connected in parallel, and each has a constant current circuit section 11a, 12a, and 13a. Even if not, it is possible to drive the device to emit light with only one or only two loaded. Further, as described above, the LED module can be added using the connector 22.
(Configuration of LED module)
The configuration of the LED modules 11, 12, and 13 will be described with reference to FIGS. FIG. 4 is a perspective view (partially transparent view) of the LED module 13, and FIG. 5 is a circuit diagram thereof.
As shown in FIG. 4, in the LED module 13, a constant current circuit section 13a and an LED mounting section 13b are formed on a main board 130. The connection terminals 136 and 137 are provided on the lower left edge of the main board 130 in the drawing.
The main substrate 130 is a so-called metal base substrate having a configuration in which an insulating layer 130a such as a resin is laminated on a metal layer 130b such as Al. The main substrate 130 has a good thermal conductivity of 1 to 10 (W / m · K) because the insulating layer 130a and the metal layer 130b are in a state of being thermally bonded.
Therefore, the main board 130 has very excellent thermal conductivity as compared with a board made of only resin. That is, it can be said that this is an optimal substrate for a lighting device or the like that uses LED bare chips mounted in high density. On the insulating layer 130a, conductive lands (not shown) having a desired pattern are formed.
The insulating layer 130a in the main substrate 130 is formed from a composite material including an inorganic filler (Al 2 O 3 , MgO, BN, SiO 2 , SiC, Si 3 N 4 , AlN, etc.) and a resin composition.
Although not shown, the LED mounting portion 13b has a total of 64 LED bare chips mounted on conductive lands on the main board 130 using FCB (flip chip bonding) by an ultrasonic bonding method. After arranging the reflection plate and the phosphor resin, the structure is sealed with resin. At the time of sealing, hemispherical lenses are formed at locations corresponding to the respective LED bare chips.
Further, a part of the conductive land extends from one side surface of the sealing resin in the LED mounting portion 13b, and functions as terminals 13b1 and 13b2 for connection with a constant current circuit portion 13a described later. .
As shown in FIG. 4, a constant current circuit section 13a is provided on the main board 130 between the LED mounting section 13b and a region where the connection terminals 136 and 137 are formed.
More specifically, the constant current circuit section 13a uses a sub-substrate 131 on which conductive lands 132 having a desired pattern are formed, and forms one resistance element 133 and two transistor elements 134 on the sub-substrate 131 in advance by using a reflow method. , 135 are mounted and configured.
The sub-substrate 131 on which the constant current circuit is formed is attached to the above-mentioned area on the main substrate 130 using a resin material or the like.
The connection between the constant current circuit section 13a and the terminals 13b1 and 13b2 of the LED mounting section 13b, and the connection between the constant current circuit section 13a and the connection terminals 136 and 137 are made using a bonding wire 138 made of Au or the like.
Also, in FIG. 4, the circuit configuration on the sub-board 131 is indicated by a broken line for easy understanding, but the sub-board 131 on which the circuit is formed is sealed with a resin including each connection portion (resin). Sealing part 139).
The circuit configuration of the LED module 13 is such that the constant current circuit section 13a and the LED mounting section 13b are connected as shown in FIG. 3, but will be specifically described with reference to FIG.
As shown in FIG. 5, the LED mounting portion 13b has a configuration in which a total of 64 LED bare chips 13L are arranged in eight rows and eight rows.
Further, the constant current circuit section 13a has a general constant current circuit composed of one resistance element 133 and two NPN transistor elements 134 and 135. Specifically, a resistance element 133 is inserted between the emitter and the base of the transistor element 134, and the base of the transistor element 134 is connected to the emitter of another transistor element 135. The collector of the transistor element 134 is connected to the base of the transistor element 135.
The base of the transistor element 135 is connected to the IN-side connection terminal 136 and one terminal 13b1 of the LED mounting portion 13b, and the collector is connected to the other terminal 13b2 of the LED mounting portion 13b.
The emitter of the transistor element 134 is connected to the connection terminal 137 on the OUT side.
In this manner, the constant current circuit unit 13a is configured to be inserted into the power supply path of the LED module 13, and performs constant current control on the power supplied from the constant voltage circuit unit 40 to perform constant current control. The supplied power is supplied to the LED mounting unit 13b. That is, the constant current circuit section 13a functions as a circuit for stabilizing the luminous intensity of the LED bare chip when the LED module 13 is driven to emit light.
The other LED modules 11 and 12 have the same configuration.
(Formation of Constant Current Circuit 13a)
Next, a method for forming the constant current circuit portion 13a in forming the LED module 13 will be described with reference to FIG.
As shown in FIG. 6A, one resistive element 133 and two transistor elements 134 and 135 are surface-mounted on a conductive land 132 on the main surface of a sub-substrate 131 made of resin by using a reflow method. deep. The sub-substrate 131 in which the constant current circuit is configured by these components is mounted on the main substrate 130 on which the LED mounting portion 13b is formed in advance by using resin.
After that, as shown in FIG. 6B, a part of the conductive land on the sub-substrate 131 is connected to the terminals 13b1, 13b2 and the connection terminals 136, 137 using a bonding wire 138 made of Au.
Finally, the entire constant current circuit portion 13a including the bonding portion is sealed with resin, and the formation of the constant current circuit portion 13a on the LED module 13 is completed.
(Advantage of LED lighting device 1)
In the LED lighting device 1 configured as described above, the three LED modules 11, 12, and 13 each have a constant current circuit unit 13a as shown in FIG. 13 are connected in parallel, so that the LED module can be expanded.
That is, when the number of LED modules is increased to four or more, it is possible to use the module socket 20 having the same configuration as that of FIG. 1 described above. Since the current is controlled, the luminous intensity of the LED bare chip can be stabilized.
In addition, even when the LED bear chips mounted on the LED module have different rated currents, the constant current circuit portion 13a corresponding to the specification of the LED bear chip to be mounted can be formed in each LED module to achieve stable operation. The light emission can be driven at the emitted light intensity.
That is, when replacing the LED module, the LED lighting device 1 can use an LED module in which the specifications of the mounted LED bare chip are different from those at the time of designing the LED lighting device 1.
In addition, since the LED modules 11, 12, and 13 in the LED lighting device 1 use the metal base substrate as the main substrate 130, the heat generated in the LED bare chip 13L can be transmitted to the heat radiating plate 30 with high efficiency. That is, when a resin substrate is used as the substrate of the LED module as in the light source device disclosed in JP-A-2002-304902, it is easy to form various circuits on the same substrate, It is impossible to simply mount the LED bare chip at high density from the viewpoint of heat radiation treatment of the heat generated from the bare chip, and it is difficult to use the LED bare chip as a practical lighting device.
On the other hand, as in the present embodiment, in the LED modules 11, 12, and 13 using the metal base substrate as the main substrate 130, even when a total of 64 LED bare chips 13L are densely mounted, Deterioration of the LED bare chip 13L due to heat can be suppressed.
Further, regarding the formation of the constant current circuit portions 11a, 12a and 13a on the LED modules 11, 12, and 13, the electronic components 133 to 135 are mounted on the sub-board 131 by using a reflow method in advance as shown in FIG. A method is employed in which a constant current circuit is formed, and this is mounted on the main board 130 to form the constant current circuit section 13a in the LED module 13. Therefore, during the circuit formation stage, the LED bare chip 13L is heated by reflow heat. It does not cause damage and is excellent in cost.
Note that the sub-board 131 may be joined to the main board 130 either after the formation of the LED mounting portion 13b as shown in FIG. 6 or conversely before the formation of the LED mounting portion 13b. No problem.
In particular, when attaching the sub-board 131 before forming the LED mounting portion 13b, when the LED bare chip 13L is sealed with resin, the constant current circuit portion 13a is formed in the same process as the formation of the resin lens portion of the LED mounting portion 13b. Excellent in work efficiency because it can be sealed with resin.
Therefore, the LED lighting apparatus 1 according to the present embodiment can stabilize the luminous intensity of the LED bare chip 13L densely mounted on the main board 130, and extend and replace the LED modules 11, 12, and 13. Can be easily achieved. When expanding or replacing the LED modules 11, 12, and 13, it is not always necessary to use the same specification.
An LED lighting device according to Modification 1 will be described with reference to FIG. FIG. 7 shows a circuit configuration of the LED module 14 which is different from the above embodiment of the present invention.
As shown in FIG. 7, the LED module 14 according to the present modification has an LED mounting portion 14b composed of 64 LED bare chips 14L as in the above embodiment.
The constant current circuit section 14a is different from the above-described embodiment and includes one resistor element 143 and one transistor element 144. Specifically, the IN-side connection terminal is connected to one terminal of the LED mounting portion 14b, and is also connected to the base of the transistor element 144.
On the other hand, the connection terminal on the OUT side is connected to one end of the resistance element 143, and the other end of the resistance element 143 is connected to the emitter and the base of the transistor element 144.
The other terminal of the LED mounting part 14b is connected to the collector of the transistor element 144.
The LED module 14 having the constant current circuit unit 14a configured as described above can perform constant current control on the power supplied to the LED bare chip 14L with a simpler circuit configuration than the LED module 13 in FIG.
Therefore, the LED lighting device having the LED module 14 can stabilize the luminous intensity of the LED bare chip 14L densely mounted on the main board 130 at a lower cost than the LED lighting device 1 and can achieve the LED lighting. Like the device 1, the LED modules 11, 12, and 13 can be easily expanded and replaced.
Further, the LED module 13 is excellent in the stability of the luminous intensity.
The other parts than the circuit configuration of the constant current circuit part 14a are the same as those of the LED lighting device 1 described above.
An LED module 15 according to Modification 2 will be described with reference to FIG.
As shown in FIG. 8, the LED module 15 according to the present modification is characterized in that a part of the configuration of the constant current circuit section 15a is different and that the LED module 15 has a thermistor 15T.
Specifically, in the LED module 15, the thermistor 15T is inserted between the collector of the transistor element 154 and the base of the transistor element 155 in the constant current circuit section 15a. Although not shown, the thermistor 15T is fixed on the surface of the insulating layer of the main substrate with a silicone resin or the like.
In the LED module 15 having such a configuration, the heat from the LED bare chip 15L generated during the light emission driving can be monitored substantially in real time by the thermistor 15T, and the current to the LED mounting portion 15b can be controlled accordingly.
Here, the thermistor 15T is disposed on the surface of the insulating layer as described above, but the heat of the LED bare chip 15L can be sensed substantially in real time due to the good heat conductivity of the metal base substrate.
Therefore, in the LED lighting device including the LED module 15 according to the present modification, in addition to the advantage that the LED lighting device 1 has, it is possible to reduce the life due to the heat generated by the LED bare chip 15L during driving. Can be suppressed.
The location of the thermistor 15T is not limited on the surface of the insulating layer as described above, and since the metal base substrate having excellent heat conductivity is used, it can be placed anywhere on the substrate. Similar effects can be obtained.
For example, a groove having a size capable of embedding the thermistor 15T in the insulating layer and reaching the metal layer may be provided, and the thermistor 15T may be filled in the groove.
An LED module 16 according to Modification 3 will be described with reference to FIG.
As shown in FIG. 9, the circuit of the LED module 16 is different from the circuit of the LED module 13 according to the above-described embodiment in that a constant voltage diode (hereinafter, referred to as a “Zener diode”) 16Z is provided in parallel with the LED mounting portion 16b. Is where is inserted. In other respects, the circuit configuration and the configuration of the LED module are the same as those in the above-described embodiment.
Thus, in the LED module 16 including the Zener diode 16Z, the LED bare chip 16L, the wiring, and the like can be protected from static electricity.
Therefore, in the LED lighting device including the LED module 16, in addition to the superiority of the LED lighting device 1, the LED bare chip 16L can be protected from static electricity, and is a highly reliable device.
An LED module 17 according to Modification 4 will be described with reference to FIG.
As shown in FIG. 10, in the LED module 17 according to the present modification, a chip component for the constant current circuit portion 17a is directly attached on a conductive land 172 formed on the surface of the insulating layer of the main substrate 170.
That is, in the LED module 17, instead of using the sub-substrate as in the above-described embodiment, the resistive element 173 and the two transistor elements 174 are formed by die bonding using an Ag paste or the like at a required position of the conductive land 172. 175 are implemented.
These circuit components 173, 174, and 175 are mounted before and after ultrasonic mounting of the LED bare chip, and a region including the conductive land 172 is finally sealed with resin.
The circuit configuration of the LED module 17 is the same as that of FIG. 5, and the conductive land 172 is insulated including the connection terminals 176, 177 and the terminals 17b1, 17b2,..., 17b9 of the LED mounting portion 17b. It is formed by etching a metal layer on the layer.
The LED module 17 having such a structure is superior in weight and cost by the amount of the sub-substrate 131 as compared with the case where the sub-substrate 131 is provided like the LED module 13 according to the above-described embodiment. Further, in the LED lighting device including the LED module 17, the superiority of the LED lighting device 1 can be similarly exhibited.
The lighting device according to Modification Example 5 is characterized in that when an abnormal temperature rise occurs in the LED bare chip mounted on the LED module due to any abnormality, for example, a short circuit, the power supplied to the LED module is reduced.
That is, the LED module has an abnormality detecting unit for detecting an abnormality of the LED bare chip, and the constant voltage circuit unit has an electric power supplied to the module socket (each LED module) when the abnormality detecting unit detects the abnormality of the LED bare chip. It is characterized in that a control unit for lowering is provided.
Hereinafter, the configuration and the like will be specifically described using two examples. Here, “reducing the supplied power” includes stopping the supply of power.
Here, a case where the temperature of the LED module excessively increases as an abnormality of the LED bare chip will be described with reference to FIGS.
First, as shown in FIG. 11, the lighting device 101 according to the fifth modification includes a module socket 120 having three LED modules 18, 19, and 20 detachably attached thereto and fixed to each of the LED modules 18, 19, and 20. A constant voltage circuit unit 140 for supplying a voltage controlled voltage. The constant voltage circuit unit 140 and the module socket 120 are connected by three lead wires.
Each of the LED modules 18, 19, and 20 has substantially the same configuration, and the LED module 18 will be described below.
As shown in FIGS. 11 and 12, the LED module 18 includes a constant current circuit section 18a, an LED mounting section 18b, and a thermal element section 18c. Note that the constant current circuit section 18a and the LED mounting section 18b are as described in the embodiment, and description thereof will be omitted.
The heat-sensitive element section 18c is for detecting an abnormal temperature of the LED mounting section 18b (this is an abnormality detecting section of the present invention). For example, as shown in FIG. 12, a thermistor 186, a resistor 187, a comparator 188 and And is connected in parallel to the constant current circuit section 18a.
In FIG. 12, the thermistor 186 is separated from the LED mounting portion 18b for convenience, but is actually arranged near the LED mounting portion 18b so that if there is a temperature abnormality in the LED bare chip 18L, it can be detected immediately. Has become.
That is, when the temperature of the LED mounting portion 18b is a temperature at which no short circuit or the like occurs (this case is referred to as “normal lighting”), for example, the H signal is output from the comparator 188.
Conversely, if the temperature of the LED mounting portion 18b excessively rises from that during normal lighting (this case is referred to as “abnormal lighting”), the input voltage of the comparator 188 becomes the reference voltage (“Ref” in FIG. 12). ), And the comparator 188 outputs, for example, an L signal (indicated by “SM1” in FIG. 12).
The module socket 120 is basically the same as that described in the above-described embodiment and the first to fourth modifications. However, as shown in FIG. When the signal SM1 output from the element units 18c, 19c, 20c includes an L signal, the logic circuit unit 120a outputs an L signal (indicated by “SM2” in FIG. 13) to the constant voltage circuit unit 140. , For example, an AND gate. The output of the signal to the constant voltage circuit unit 140 is performed via a lead wire connected to the connector 121.
The logic circuit unit 120a is connected to the connector 122 in addition to the three LED modules 18, 19, and 20. This is because, as described in the embodiment, when the LED module is expanded, an abnormality of the LED module mounted in another module socket can be detected.
As shown in FIG. 13, the constant voltage circuit unit 140 includes, as main components, a rectifier 141, a capacitor C1, an output transformer T, transistors Q1, Q2, an IC, and the like.
The rectifier 141 rectifies the AC output from the commercial AC power supply 50, and the capacitor C1 is connected between the output terminals O1 and O2 of the rectifier 141, and smoothes the power rectified by the rectifier 141.
The output transformer T includes a primary winding T1 on the input side, a secondary winding T2 on the output side, and a tertiary winding T3. The input terminal I1 of the primary winding T1 is connected to the output terminal O1 of the rectifier 141, and the input terminal I2 of the primary winding T1 is connected to the collector C of the transistor Q1. Output terminals O3 and O4 of the secondary winding T2 are connected to the module socket 120 side, respectively.
The output terminal O5 of the tertiary winding T3 is connected to the S3 terminal of the IC via the diode D1, and the output terminal O6 is connected to the output terminal O2 of the rectifier 141. A capacitor C2 is connected between the output side of the diode D1 and the output end O6 of the tertiary winding T3.
The emitter E of the transistor Q1 is connected to the output terminal O6 of the tertiary winding T3, and the base B is connected to the S2 terminal of the IC.
The transistor Q1 is turned on (substantially conducting between the collector and the emitter) and turned off (non-conducting) based on a pulse signal from the signal output terminal S2 of the IC, and the DC applied to the primary winding T1 of the output transformer T. The voltage is switched to output a constant voltage to the secondary winding T2 and the tertiary winding T3 according to the turns ratio.
In addition, a control circuit 142 (this circuit) is provided between the capacitor C1 and the output transformer T to control the supply of power to the module socket 120 to be stopped when the LED bare chips of the LED modules 18, 19, 20 have an abnormality. This is a control unit of the invention.).
When the output signal SM2 of the module socket 120 is an H signal, the control circuit 142 stops the supply of power to the module socket 120 by stopping the switching of the transistor Q1.
The control circuit 142 includes an IC, a transistor Q2, and the like.
The IC is a known PWM type switching power supply control IC, and controls the switching operation of the transistor Q1. Here, S1 of the IC is a signal input terminal, S2 is a signal output terminal, S3 is a power input terminal, and S4 is a ground terminal connected to the output terminal O2 of the rectifier 141.
The power input terminal S3 of the IC is connected to the output terminal O1 of the rectifier 141 via the resistor R4, and is connected to the output terminal O5 of the tertiary winding T3 of the output transformer T via the diode D1.
The signal input terminal S1 is connected to the collector C of the transistor Q2, and is also connected to the power input terminal S3 via the resistor R3. The emitter E of the transistor Q2 is connected to the output terminal O2 of the rectifier 141, and the base B is connected to the module socket 120 (logic circuit section 120a).
In such a configuration, the constant voltage circuit unit 140 performs the following operation.
(Normal lighting)
First, the constant voltage circuit unit 140 is connected to the power supply source 50, the module socket 120 is connected to the constant voltage circuit unit 140 via a lead wire, and the power from the power supply source 50 connects the constant voltage circuit unit 140. It is supplied to the LED modules 18, 19, and 20 via the power supply.
Each of the LED modules 18, 19, and 20 receives supply of power from the constant voltage circuit unit 140, and each of the LED bare chips (18L) in the LED mounting units 18b, 19b, and 20b is turned on.
At this time, if the temperature of the LED mounting portions 18b, 19b, and 20b in each of the LED modules 18, 19, and 20 is the temperature at the time of normal lighting, the H signal (SM1) is output from the comparator of each of the thermosensitive element portions 18c, 19c, and 20c. Is output to the logic circuit unit 120a.
The logic circuit unit 120a outputs an H signal (SM2) to the constant voltage circuit unit 140 when all the input signals SM1 from the comparator are H signals.
On the other hand, in the constant voltage circuit unit 140, the input AC power is rectified by the rectifier 141, and the rectified DC voltage is applied to the power input terminal S3 of the IC via the resistor R4. At the same time, charging of the capacitor C2 is started. Here, the value of the resistor R4 is set large for the protection of the IC, and when the charging of the capacitor C2 is completed, the operating voltage of the IC is reached and the operation of the IC is started.
When there is no abnormality in the LED modules 18, 19, and 20 to the base B of the transistor Q2, the voltage of the H signal is applied, and Q2 is turned on (the collector and the emitter are almost electrically connected), and the IC is turned on. Signal input terminal S1 is almost grounded (L level).
When an operating voltage is applied to the power supply input terminal S3 and the signal input terminal S1 is grounded, that is, when the IC is at the L level, the IC outputs a pulse signal having a predetermined cycle and a predetermined duty ratio. The signal is output from the output terminal S2, and the transistor Q2 is switched (on / off).
As a result, a voltage having a substantially rectangular waveform is applied to the primary winding T1 of the output transformer T, and a voltage corresponding to the turns ratio is output from the secondary winding T2 and the tertiary winding T3.
The output from the secondary winding T2 causes the LED bare chips of the LED modules 18, 19, 20 to light up.
Although the output from the tertiary winding T3 is also a rectangular wave, it is rectified and smoothed by the diode D1 and the capacitor C2 and applied to the power input terminal S3 of the IC. That is, after the switching by the transistor Q2 is started, the output of the tertiary winding T3 becomes the supply source of the operating voltage of the IC.
(When temperature is abnormal)
On the other hand, when a short circuit or the like occurs in any one of the LED bare chips of the LED modules 18, 19, and 20, the temperature of the LED mounting portion that has caused the short circuit abnormally increases.
This rise in temperature lowers the resistance of the thermosensitive elements 18c, 19c, 20c provided in the LED modules 18, 19, 20. When a voltage equal to or higher than the reference voltage is input to the comparator 188, the L signal (SM1) is output from the comparator 188. Is output to the logic circuit unit 120a. In response to this, the logic circuit section 120a outputs an H signal (SM2) to the constant voltage circuit unit 140.
Since the output signal SM2 from the module socket 120 is an L signal, the transistor Q2 turns off, and the output voltage of the output terminal O5 of the tertiary winding T3 of the output transformer T is connected to the diode D1 at the signal input terminal S1 of the IC. , Through the resistor R3 (hereinafter, referred to as “H level”).
When the signal input terminal S1 goes high, the IC stops outputting the pulse signal from the signal output terminal S2 and stops the switching operation of the transistor Q2 (turns off the transistor Q2).
As a result, no current flows through the primary winding T1 of the output transformer T, the outputs of the secondary winding T2 and the tertiary winding T3 become almost zero, and the LED bare chips of the LED modules 18, 19 and 20 are turned off.
The power supplied to the LED modules 18, 19, and 20 can be reduced by, for example, setting the on / off switching operation of the transistor Q2 to a longer off state.
Here, the case where the current amount of the LED bare chip excessively increases as the abnormality of the LED bare chip will be described with reference to FIG. 14 for the LED module. Note that the module socket and the constant voltage circuit unit in this example are the same as those in Example 1 described above, and thus description thereof will be omitted. Further, since each of the LED modules according to the present example has the same structure, the LED module 20 will be described.
As shown in FIG. 14, the LED module 21 includes a constant current circuit unit 21a, an LED mounting unit 21b, and a current detection unit 21c. Note that the constant current circuit section 21a and the LED mounting section 21b are as described in the embodiment, and a description thereof will be omitted.
The current detection section 21c is for detecting a current abnormality of the LED mounting section 18b (an abnormality detection section of the present invention), and includes, for example, a resistor 216a and a comparator 216b as shown in FIG. I have. The current detection unit 21c is connected in series upstream of a series group in which eight LED bare chips 19L are connected in series, and outputs the output signal SM3 of the comparator 216b to the logic circuit unit 217.
That is, when there is no disconnection or the like in the LED bare chip 21L in the eight-row serial group (this case corresponds to “at the time of normal lighting” in Example 1), the comparator 216b performs the same operation as in Example 1 described above. For example, when the H signal is output and the LED bare chip 21L is disconnected and the current amount in the series group increases (this case corresponds to “abnormal lighting” in Example 1). The input voltage of the comparator 216b becomes equal to or higher than the reference voltage, and the comparator 216b outputs, for example, an L signal (indicated by “SM3” in FIG. 14).
Then, the signal SM3 from the comparator 216b in each column is output to the logic circuit unit 217. If all the input signals SM3 from the comparators 216b are H signals, the logic circuit unit 217 outputs an H signal (SM4) to the constant voltage circuit unit, and the input signal SM3 from each comparator 216b includes an L signal. If it is, an L signal (SM4) is output to the constant voltage circuit unit.
3. Conclusion In Examples 1 and 2 described above, if an abnormality occurs in the LED mounting units 18b, 19b, 20b, and 21b for some reason, the abnormality is detected by the abnormality detection unit (the thermosensitive element unit in Example 1, the current detection unit in Example 2). ) To stop the supply of power to the module socket.
Thereby, for example, the temperature of one LED mounting portion of the plurality of LED modules excessively increases, and this heat is transmitted from the heat sink 30 (see FIGS. 1 and 2) to another LED module, and It is possible to prevent the temperature of the LED module from rising. In addition, when heat is transmitted to another LED module and its temperature rises, the life of the LED bare chip is shortened.
4. Other a. Regarding the lighting device In the lighting device according to the fifth modification, the module socket and the constant voltage circuit unit are separate bodies, but they may be integrated. Even in this case, when an abnormality occurs in the LED mounting portion, the power supplied to each LED bare chip is reduced, so that an excessive rise in temperature of each LED module can be prevented, and breakage or malfunction of the constant voltage circuit unit can be prevented. Can be prevented.
b. Regarding the constant voltage circuit unit The circuit configuration of the constant voltage circuit unit in Modification Example 5 is also an example, and a constant voltage circuit other than the above-described configuration may be provided. For example, a constant current circuit using an operational amplifier may be used.
c. LED Module In the fifth modification, the LED module is detachable, but may not be detachable. In other words, the present modification is characterized in that the power supplied to the LED bare chip of the LED mounting unit is reduced when the LED mounting unit is abnormal.
Therefore, for example, the lighting device includes an LED bare chip (one or more), a lighting circuit for lighting the LED bare chip, and abnormality detection for detecting an abnormality such as an increase in temperature or an increase in current when the LED bare chip is lit. Means, and the lighting circuit may include a control circuit that reduces power supplied to the LED bare chip when the abnormality detecting means detects an abnormality in the LED bare chip.
The lighting circuit described above includes, for example, a rectifying / smoothing circuit for rectifying and smoothing power from a power supply source, a switch element for switching an output of the rectifying / smoothing circuit, and a switch for switching a primary side of the rectifying / smoothing circuit to the first rectifying circuit. An output transformer connected to the element (eg, in series). On the other hand, the control circuit controls, for example, the switching operation of the switch element of the lighting circuit to reduce (including stop) the output of the output transformer.
The embodiments of the present invention and the modified examples 1 to 54 are used as examples to explain the configuration of the present invention and the effects obtained, and the scope of the above (means for solving the problems) is described. If it is inside, it is not limited to this. For example, in the above-described embodiment, the sub-substrate 131 made of a resin material is used, and the components for the constant current circuit are surface-mounted on the sub-substrate 131. However, a substrate made of ceramic, a Si substrate, or the like may be used. In particular, when a Si substrate is used as a sub-substrate, the transistor region and the resistance region can be diffused and formed on the Si substrate, so that a compact and inexpensive constant current circuit section can be obtained.
In addition, the circuit configuration of the constant current circuit unit is also an example, and a constant current circuit unit having a configuration other than the above-described embodiment and the modified example may be provided. For example, a constant current circuit using an operational amplifier may be used.
In the above embodiment, the constant current circuit is used as an example of a circuit for stabilizing the luminous intensity of the LED bare chip. However, a constant voltage circuit may be used. However, it is generally desirable to use constant current control for controlling the LED.
Also, in FIG. 1 described above, a fixed type is used for the module socket 20. However, if the module socket 20 has a structure in which the loading portions 20a, 20b, 20c of the LED modules 11, 12, 13 are movable, the light emitting module 11 , 12, 13 can be improved. For example, if the module socket is provided with a hinge mechanism so that only the magazine portion can be raised from the base portion fixed to the lighting device main body, the module socket is removed from the lighting device each time the LED module is replaced. If not, the magazine can be raised and replaced.
INDUSTRIAL APPLICABILITY The lighting device according to the present invention can be used to stabilize the luminous intensity, and can be used to easily replace an LED module with a different specification and expand the LED module.
It is a principal part perspective view showing LED lighting device 1 concerning an embodiment of the invention. It is sectional drawing which shows the AA part in the LED lighting device 1 of FIG. FIG. 2 is a block diagram illustrating a circuit of the LED lighting device 1 of FIG. 1. FIG. 2 is a perspective view (partially transparent view) showing an LED module 13 which is a component of the LED lighting device 1 of FIG. 1. FIG. 5 is a circuit diagram of the LED module 13 of FIG. FIG. 5 is a process chart illustrating a method for forming the LED module 13 of FIG. 4. FIG. 9 is a circuit diagram of an LED module 14 according to a first modification. FIG. 9 is a circuit diagram of an LED module 15 according to a second modification. FIG. 13 is a circuit diagram of an LED module 16 according to a third modification. FIG. 15 is a perspective view (partially transparent view) showing an LED module 17 according to Modification 4. 15 is a block diagram illustrating a circuit of an LED lighting device 101 according to Modification Example 5. FIG. FIG. 15 is a circuit diagram of an LED module 18 according to a first modification example 5. 15 is a diagram illustrating a circuit configuration of a constant voltage circuit unit 140 according to Example 1 of Modification Example 5. FIG. FIG. 14 is a circuit diagram of an LED module 21 according to a second modification example 5.
DESCRIPTION OF SYMBOLS 1 LED lighting apparatus 11, 12, 13 LED module 15T Thermistor 16Z Zener diode 20 Module socket 30 Heat sink 40 Constant voltage circuit unit 130 Main board 131 Sub-board 133 Resistance element 134, 135 Transistor element 139 Resin sealing part
An LED module having a light emitting diode bare chip and a power supply terminal for receiving power supply from a power supply source side on a main surface of a main board; a luminous intensity stabilization electrically connected between the power supply terminal and the light emitting diode bare chip; A lighting device, further comprising a circuit.
The lighting device according to claim 1, wherein the luminous intensity stabilizing circuit is a constant current circuit.
A constant voltage circuit that supplies constant-voltage controlled power to the power supply terminal by using power supplied from a power supply source; and in the LED module, the power supplied to the power supply terminal is the constant current circuit. The lighting device according to claim 2, wherein the light is supplied to the light emitting diode bare chip after the constant current control is performed.
A sub-board is mounted on the main board,
The lighting device according to claim 2, wherein the constant current circuit is formed on the sub-substrate.
The lighting device according to claim 4, wherein the sub-substrate is made of resin, ceramic, or Si.
A second LED module is connected to the LED module in parallel with a power supply,
The lighting device according to any one of claims 1 to 5, wherein the second LED module has a configuration equivalent to that of the LED module.
The lighting device according to claim 1, wherein the LED module is detachable from a socket on a power supply source side.
The main board is formed by laminating an insulating layer disposed on a main surface side and a metal layer disposed on a main back side, and the socket is configured such that when the LED module is loaded, the main board is The lighting device according to claim 7, further comprising: a heat sink that is in thermal contact with the metal layer of (1) to release heat when the light emitting diode bare chip emits light to the outside of the LED module.
In the LED module, a heat-sensitive element connected to the luminous intensity stabilizing circuit is arranged near a region where the light-emitting diode bare chip is mounted,
The said light intensity stabilization circuit reduces the electric current supplied to the said light emitting diode bare chip, when the temperature of the said light emitting diode bare chip becomes more than the preset temperature. The method in any one of Claim 1 to 8 characterized by the above-mentioned. Lighting equipment.
In the LED module, in the vicinity of the region where the light emitting diode bare chip is mounted, an abnormality detecting unit that detects an abnormality of the light emitting diode bare chip is arranged,
The said constant voltage circuit is provided with the control part which reduces or stops the electric current supplied to the said LED module, when the said abnormality detection part detects abnormality of a light emitting diode bare chip. The thing in any one of Claim 3 to 9 characterized by the above-mentioned. The lighting device according to the above.
The lighting device according to claim 10, wherein the abnormality detecting unit is a thermosensitive element that detects a temperature abnormality of the light emitting diode bare chip.
In the LED module, there are a plurality of the light emitting diode bare chips, and in the light emitting diode bare chips, a plurality of serial groups connected in series are connected in parallel, and a current detecting unit is connected to each series group. Has been
The said constant voltage circuit is provided with the control part which reduces or stops the supply current to the said LED module, when there is abnormality in the electric current amount which the said current detection part detects. The lighting device according to claim 1.
13. The lighting device according to claim 1, wherein in the LED module, a zener diode is connected to the luminous intensity stabilizing circuit in parallel with the light-emitting diode bare chip. 14.
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