JP4791794B2 - LED lighting attachment - Google Patents

LED lighting attachment Download PDF

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Publication number
JP4791794B2
JP4791794B2 JP2005307560A JP2005307560A JP4791794B2 JP 4791794 B2 JP4791794 B2 JP 4791794B2 JP 2005307560 A JP2005307560 A JP 2005307560A JP 2005307560 A JP2005307560 A JP 2005307560A JP 4791794 B2 JP4791794 B2 JP 4791794B2
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led
constant current
attachment
led module
circuit
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JP2007115594A (en
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佳明 八谷
崇 國松
穣 福井
竜太郎 荒川
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パナソニック株式会社
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Description

The present invention relates to an attachment incorporating a drive circuit for an LED lighting device.

Currently, most illumination devices for indoor lighting use incandescent bulbs or fluorescent lamps for AC 100 volts as the light source. However, incandescent bulbs have the disadvantages of high power consumption and short lifetime. Fluorescent lamps consume less power and have a longer life than incandescent bulbs, but there is a need for further lower power consumption and longer life. In recent years, high-brightness LEDs (light-emitting diodes) have attracted attention as light sources for lighting devices that satisfy such requirements, and have been used in some lighting devices.

  The LED lighting device differs greatly from the incandescent bulb and the fluorescent lamp in the driving method and driving circuit, and needs to be driven by a direct current. Furthermore, it is preferable to drive with a constant current in consideration of efficiency and safety. In addition, since the shape of the LED lighting device is different from that of the conventional lighting device, it is usually difficult to directly attach the LED lighting device to a socket for an incandescent bulb or a receptacle for a fluorescent lamp lighting device provided in a general home. Therefore, in order to introduce the LED lighting device into a general home, it is necessary to perform power supply installation work and electrical wiring work including a receptacle for the LED lighting device in the home.

Therefore, an LED lighting device that can be directly mounted on an incandescent bulb socket has been proposed. For example, Patent Document 1 discloses an LED lighting device having a structure that includes a base similar to an incandescent bulb and incorporates a power supply circuit for driving LEDs therein. This LED lighting device has a diode bridge circuit that rectifies alternating current into direct current as a power supply circuit for driving LEDs, and a resistor and a Zener diode that step down the rectified direct current voltage to a low voltage (5 volts) for driving LEDs A circuit including When the base of the LED lighting device is attached to a socket for an incandescent lamp, a 5 volt DC voltage is obtained from the 100 volt AC voltage supplied to the base by the above power supply circuit, and this is applied to a plurality of LEDs arranged on the substrate. Is done. As a result, a plurality of LEDs emit light and illuminate the surroundings.
JP 2001-52504 A (pages 5-6, FIG. 1)

  However, the conventional LED lighting device disclosed in Patent Document 1 has the following problems. That is, since the power supply circuit housed in the base is a circuit that rectifies and steps down an AC voltage to a DC voltage to easily make a constant voltage, the LED driving current is likely to fluctuate. For example, the current value flowing through the LED varies due to variations in the forward voltage drop of the LED. As a result, the illuminance and emission color of the LED illumination device vary. Moreover, since there is a loss in the series resistance included in the power supply circuit, the power supply utilization efficiency is poor, and the advantages of the LED device having low power consumption cannot be fully utilized. Furthermore, since there are various types of LED devices and their rated currents are different from each other, it is necessary to change the circuit constant of the power supply unit according to the LED. In other words, it is necessary to provide a dedicated power supply unit according to the LED device to be used.

  In view of the above-described conventional problems, the present invention provides an LED illumination attachment that is interposed between a receptacle for an illuminating device installed in a home and the LED module and supplies a constant current to the LED module. For the purpose. It is also an object of the present invention to provide an LED illumination attachment that can change the constant current value to be supplied according to the rated current of the LED module and that is automatically set.

The attachment for LED lighting according to the present invention includes a case provided with a power input terminal electrically connected to a commercial power line and a constant current output terminal connected to the LED module, and is incorporated in the case. A driving circuit that generates a constant current for LED driving from the power supplied from the input terminal and outputs the constant current to the constant current output terminal, and the driving circuit includes a switching element connected in series to the LED module; An energy storage device for storing electrical energy as magnetic energy, and a regenerative diode for continuing to flow current due to the magnetic energy stored in the energy storage device to the LED module when the switching element is turned off, A current detection circuit for detecting a current flowing through the switching element; Look including a switching element control circuit for on-off control of the switching element based on the output of the clock and the current detection circuit, the power input terminals are provided so as to protrude from the surface of the case, the constant The current output terminal is a concave terminal provided in a hole formed in the surface of the case .

  The LED illumination attachment of the present invention can be interposed between a lighting device receptacle and the like installed in a home and the LED module to supply a constant current to the LED module. Thus, a power-saving LED lighting device can be easily realized. In addition, since it is possible to connect an LED illumination attachment to a lighting device receptacle or the like installed in the home without special electrical work, the LED lighting device can be easily used in the home. It becomes like this.

  In a preferred embodiment of the LED illumination attachment according to the present invention, the power input terminal and the constant current output terminal are respectively disposed on opposite surfaces of the case. According to such a configuration, a small LED illumination attachment can be realized, and for example, a downlight type illumination device using LEDs connected to a receptacle for a lighting fixture installed on a ceiling can be easily realized.

  In another preferred embodiment of the LED illumination attachment according to the present invention, the power input terminal is provided so as to protrude from the surface of the case, and the constant current output terminal is provided in a hole formed on the surface of the case. It is a concave terminal provided. According to such a configuration, when the LED illumination attachment that is not attached to the LED module is attached to the receptacle for the lighting fixture, the constant current output terminal does not protrude from the surface of the case, so there is no possibility of touching the human body. Since there is no risk of electric shock, it is possible to realize an attachment for LED lighting in consideration of safety.

  In still another preferred embodiment of the LED illumination attachment of the present invention, the power input terminal and the constant current output terminal are provided on the same surface of the case. According to such a configuration, a surface (for example, a ceiling surface) to which the illumination device receptacle is attached is irradiated by the LED module, and an indirect illumination type LED illumination device that illuminates the room with the reflected light is easily realized. be able to.

  In another preferred embodiment of the LED illumination attachment according to the present invention, a constant current setting means for changing and setting a constant current value for LED driving output to the constant current output terminal by the driving circuit is provided. It has been. According to such a structure, the general purpose LED illumination attachment which can respond to a some LED module is realizable. That is, a plurality of types of LED modules having different rated currents can be used with the same LED illumination attachment.

  In still another preferred embodiment of the LED illumination attachment according to the present invention, an operation portion of a circuit component constituting the constant current setting means is provided on the surface of the case. According to such a configuration, it is possible to provide a convenient LED illumination attachment that allows the user to easily change and set the LED drive current (output current). If the drive current is changed for the same LED module, it can also be used as a dimming function for adjusting the luminance of the LED.

  In still another preferred embodiment of the LED illumination attachment according to the present invention, the switching element is connected to a high potential side of the constant current output terminal, and a switch for forcibly turning off the switching element by an external operation is provided. It has been. According to such a configuration, it is possible to safely remove the LED module from the LED illumination attachment. In other words, if the LED module is removed after forcibly turning off the switching element, both constant-current output terminals are at a low potential, so work without fear of electric shock. Can do.

  In still another preferred embodiment of the LED illumination attachment according to the present invention, the timer circuit for measuring the usage time of the LED module electrically connected to the constant current output terminal, and based on the output of the timer circuit, And an indicator for indicating that it is time to replace the LED module. According to such a configuration, the lifetime deterioration of the LED module can be managed by integrating the usage time, and the user can be notified that the replacement time has come. This facilitates early replacement before the brightness of the LED module is greatly reduced.

  In still another preferred embodiment of the attachment for LED illumination of the present invention, at least a contact surface with the LED module is formed of a material having high thermal conductivity among the surfaces of the case, and the LED module is used for the LED illumination. The heat generated in the LED module when mounted on the attachment is radiated through the contact surface. According to such a configuration, since heat generated in the LED module is dissipated through the contact surface of the LED illumination attachment, the temperature rise of the LED module can be suppressed, and the reliability of the entire LED illumination apparatus is improved.

  In still another preferred embodiment of the LED illumination attachment according to the present invention, the electronic components constituting the drive circuit are mounted on a metal base substrate having a high thermal conductivity. According to such a configuration, the heat dissipation of the electronic component mounted on the substrate is promoted, the temperature rise is suppressed, and a highly reliable LED illumination attachment can be realized.

  In still another preferred embodiment of the LED illumination attachment according to the present invention, an incandescent bulb base is provided as a power input terminal so that the electronic components and the substrate constituting the drive circuit are substantially contained in the internal space of the base. Is housed in. According to such a configuration, since the LED lighting attachment is directly screwed into the incandescent light bulb socket installed on the ceiling or wall surface of the room, it can be easily attached without requiring special electrical work. It is easy to remove. An LED lighting apparatus having a high degree of freedom in design and appearance can be realized by a combination of a compact LED illumination attachment in which a drive circuit is built in the base and an LED module.

In still another preferred embodiment of the LED illumination attachment according to the present invention, the LED module is provided with an operation portion having a specific shape determined according to a rank of a rated drive current, and the LED illumination attachment includes: When the LED module is mounted, a rated current detection unit is provided that outputs a unique signal that is operated according to the rank of the rated drive current when operated by the operation unit, and the constant current detection unit outputs the specific signal according to the output of the rated current detection unit. The constant current value output to the current output terminal is automatically set. According to such a configuration, when the LED module is attached to the LED illumination attachment, the drive current supplied to the LED module is automatically set. Therefore, settings that may occur when manually setting the drive current The risk of breaking the LED module due to mistakes can be avoided.
(Embodiment 1)
FIG. 1 is a cross-sectional view showing the structure of an LED illumination attachment or the like according to the first embodiment of the present invention. FIG. 2 is a circuit diagram of an LED drive circuit built in the LED illumination attachment of FIG. FIG. 3 is a functional block diagram centering on the switch IC of the LED drive circuit of FIG. FIG. 4 is a waveform diagram showing waveforms of voltages and currents at various parts in the functional block diagram of FIG.

  As shown in FIG. 1, the attachment 1 for LED lighting of this embodiment is used interposing between the receptacle 28 for illuminating devices installed in the ceiling 9 of the general household, for example, and the LED module 4. As shown in FIG. A pair of power input terminals 2 is provided on one surface (upper surface in FIG. 1) of a rectangular parallelepiped or a cylindrical case (for example, a resin case) constituting the LED illumination attachment 1, and the power input terminals 2 are illuminated. It is electrically connected to the power supply terminal 2 </ b> A of the apparatus receptacle 28. The illumination device receptacle 28 is connected to the indoor wiring 10 laid on the back of the ceiling. Therefore, the commercial AC voltage is supplied from the indoor wiring 10 to the LED illumination attachment 1 mounted on the illumination device receptacle 28 through the connection between the power supply terminal 2A and the power input terminal 2.

  Further, the surface (the lower surface in FIG. 1) opposite to the surface provided with the power input terminal 2 of the case of the LED illumination attachment 1 constitutes a contact surface 25 with the LED module 4. The contact surface 25 is provided with a pair of holes, and the constant current output terminals 3 for supplying a constant current to the LED module 4 are provided in the holes. The constant current output terminal 3 is electrically connected to the constant current input terminal 3 </ b> A of the LED module 4. The shape of the power input terminal 2 and the constant current output terminal 3 of the LED illumination attachment 1 can be connected to the power supply terminal 2A of the illumination device receptacle 28 and the constant current input terminal 3A of the LED module 4, respectively. Any shape can be designed.

  The LED module 4 has a structure in which a transparent or translucent lens 24 is provided on one surface of a resin case, and an LED device mounting substrate 23 on which the LED device 5 is mounted is accommodated in the resin case. The constant current input terminal 3A is directly mounted on the LED device mounting board 23 and is electrically connected. However, the illustrated structure is merely an example, and LED modules having various appearances and structures can be used in practice.

  Inside the LED illumination attachment 1, a control component mounting board 6, an electronic component 8, and the like constituting a drive circuit as shown in the circuit diagram of FIG. 2 are incorporated. By attaching the LED illumination attachment 1 so as to be interposed between the illumination device receptacle 28 and the LED module 4, a predetermined DC constant current is generated from the commercial AC voltage supplied in the home to the LED module. Can be supplied.

  Next, the operation of the drive circuit built in the LED illumination attachment 1 will be described with reference to FIG. The commercial alternating current supplied from the power input terminal 2a is supplied to the rectifying diode bridge 13 via the line filter 19 for protecting each circuit element from surge and noise. However, the line filter 19 is not essential and can be omitted.

  The voltage converted from alternating current to direct current (pulsating flow) by the diode bridge 13 becomes a substantially constant direct current voltage by the smoothing capacitor 18b. A coil 11, an LED module 4, and a switching element 14 as energy storage devices are connected in series to this DC voltage. Further, a regenerative diode 12 for flowing a regenerative current is connected between the cathode side of the LED module 4 and the power source side of the coil 11. As the regenerative diode 12, it is preferable to use a fast rectification diode (FRD) that has a short reverse recovery time (for example, 200 ns or less). In the following description, the regenerative diode 12 is referred to as FRD12.

  The above circuit is merely an example. For example, the rectifier circuit formed of the diode bridge 13 may be a half-wave rectifier circuit configured by one diode. The smoothing capacitor 18b is not essential and can be omitted. Moreover, the order of the serial connection of the coil 11 and the LED module 4 may be reversed.

  A switching element control circuit 15 for on / off control of the switching element 14 is connected to the gate of the switching element 14. A capacitor 18 a for stabilizing the output voltage of the internal control power supply circuit 27 is connected between the power supply terminals of the switching element control circuit 15. Further, a current detection circuit 16 that detects a drain current flowing through the switching element 14 is provided, and an output thereof is fed back to the switching element control circuit 15. The operating power supply for the switching element control circuit 15 is generated and supplied by the control power supply circuit 27 from the DC voltage generated by the diode bridge 13 and the smoothing capacitor 18b. The switching element 14, the switching element control circuit 15, the current detection circuit 16, and the control power supply circuit 27 can be configured as a monolithic IC 17 configured on the same semiconductor substrate. This monolithic IC 17 is referred to as “switch IC 17” in the following description.

  FIG. 3 is a functional block of a drive circuit centered on the switch IC 17. FIG. 4 is a waveform diagram showing waveforms of voltages or currents at various parts in the functional block diagram of FIG. Hereinafter, the operation of supplying a constant DC current to the LED module 4 will be described with reference to FIGS. 3 and 4.

  In FIG. 3, when a switch (for example, a lighting switch for an indoor wall surface) 36 is turned on, an AC voltage is supplied from the commercial AC power supply 10 to the power input terminal 2 a. The AC voltage is rectified by the diode bridge 13 and smoothed by the smoothing capacitor 18b to become the DC voltage Vin. When the AC voltage is 100 volts, a DC voltage Vin of about 140V is obtained. This DC voltage Vin is connected to the IN terminal of the switch IC17, and the internal reference circuit compares the internal reference potential with the potential divided by the DC voltage Vin and rises above the starting voltage set to a predetermined value. Then, the switch IC 17 becomes operable. If the DC voltage Vin drops below the stop voltage for some reason, the switch IC 17 stops operating.

  When the Vin voltage rises, substantially the same voltage as the Vin terminal is applied to the VD terminal of the switch IC 17. The switching element 14 in this figure is an element in which JFET and MOSFET are integrated. When the gate terminal of the switching element 14 is in an OFF state and the same voltage as Vin is applied to the VD terminal, the pinch-off voltage of the JFET is applied to the VJ terminal. Is applied. The control power supply circuit 27 generates the internal circuit drive voltage Vcc of the switch IC 17 from the applied voltage of VJ. When the internal circuit drive voltage Vcc rises and the DC voltage Vin rises above the starting voltage, the switch IC 17 generates a clock with a predetermined frequency generated by the internal oscillation circuit, a MAX DUTY signal that determines the maximum duty, and the voltage of VJ (switching The switching element 14 is repeatedly turned on and off in accordance with a drain current ID that can be detected from the Ron voltage of the element 14 and a signal from an on-time blanking pulse generator that does not detect reverse recovery current when the switching element 14 is turned on. Start. When the switching element 14 is turned on, the current IL flows through a path including the coil 11, the LED module 4, and the switching element 14. When the switching element 14 is turned off by the following control, the current IL that continues to flow through the coil 11 flows through a loop that passes through the LED module 4 and the FRD 12 as a regenerative current.

  In this block diagram, the drain-source voltage VJ of the switching element 14 is fed back to the current detection circuit 16. Further, the current detection circuit 16 is configured as a part of the switching element control circuit 15. Although these points are different from the circuit diagram shown in FIG. 2, there is no difference in basic operation, and any configuration may be used.

  Due to the action of the switching element control circuit 15 including the current detection circuit 16, the gate voltage of the switching element 14 is set so that the switching element 14 is turned off when the drain current ID flowing through the switching element 14 in the on state reaches a predetermined current value. Is controlled. The switch IC 17 supplies a constant current (a ripple current with a constant average current) to the LED module 4 by repeatedly turning on and off.

  As shown in the waveform diagram of FIG. 4, the drain-source voltage VD (substantially equal to VJ) of the switching element 14 changes in a rectangular waveform according to the on / off state of the switching element 14. Correspondingly, the drain current ID of the switching element 14 also changes, but rises linearly with a slope (dID / dt) determined by the inductance of the coil 11 and the DC voltage Vin while the switching element 14 is on. When the drain current ID reaches the peak value IDP, the switching element 14 is turned off as described above. When the switching element 14 is turned off, the drain current ID suddenly becomes zero, but the current IL is applied to the loop composed of the coil 11, the LED module 4 and the regenerative diode (FRD) 12 by the magnetic energy accumulated in the coil 11. It continues to flow and its value gradually decreases. Then, as soon as the switching element 14 is turned on according to the above-mentioned clock, the current IL starts to rise again.

  Therefore, the current IL flowing through the coil 11 and the LED module 4 is a ripple current having a peak value IDP, a bottom value IDL, and an average value (constant current output value) ILO as shown in FIG. That is, the LED module 4 is supplied with a constant current having a constant average value ILO determined by the inductance of the coil 11 and the DC voltage Vin.

  As described above, according to the LED illumination attachment 1 of the present embodiment, the rectifier diode 13, the coil (energy storage device) 11, the FRD (regeneration diode) 12, the switching element 14, the current detection circuit 16, and the switching element control. The drive circuit including the circuit 15 can generate a constant DC current from the AC voltage supplied from the commercial power supply line, and can stably drive the LED module 4.

  The bottom value IDL of the current IL flowing through the LED module 4 can be adjusted by the on / off control clock frequency of the switch IC 17 so that the average value (constant current output value) ILO matches the rated current of the LED module 4. It is necessary to adjust to. In addition, the ripple width of the current IL (difference between the peak value IDP and the bottom value IDL) can be reduced by setting the inductance, clock frequency, and the like of the coil 11 to optimum values. In addition, various devices such as a MOSFET, an IGBT, and a bipolar transistor can be used as the switching element 14.

  In the LED illumination attachment 1 of the present embodiment, as shown in FIG. 1, the control component mounting substrate 6 and the electronic component 8 mounted on the control component mounting substrate 6 constitute the drive circuit as described above. Further, the power input terminal 2 and the constant current output terminal 3 described above are electrically connected to the control component mounting board 6. The control component mounting board 6 is preferably composed of a metal base board having a high thermal conductivity. Thereby, heat dissipation of the electronic component 8 etc. is accelerated | stimulated, a temperature rise is suppressed, and the attachment for LED illumination with high reliability is realizable.

  In FIG. 2, the LED module 4 is drawn with one LED circuit symbol, but actually, due to the voltage, the LED module 4 is configured by connecting a plurality of LEDs in series as shown in FIG. 3. .

  Moreover, since the LED module 4 has polarity and may break if the anode and the cathode are connected in reverse, it is necessary to devise measures to prevent reverse connection. For example, the reverse connection may be prevented by changing the shape and size of the pair of constant current output terminals 3 (and the constant current input terminal 3A of the LED module 4) according to the polarity. Alternatively, a reverse connection may be prevented by adding a dummy terminal or an engaging portion in the vicinity of the constant current output terminal 3 and the constant current input terminal 3A. The arrangement of the constant current output terminal 3 is not limited to that shown in FIG. 1 and can be changed according to the design of the LED module 4.

  Moreover, it is preferable to comprise the contact surface 25 with the LED module 4 of the attachment 1 for LED lighting with a material with good thermal conductivity. When the LED module 4 is mounted on the LED illumination attachment 1, the heat generated in the LED module 4 is dissipated through the contact surface 25 of the LED illumination attachment 1, thereby suppressing the temperature rise of the LED module 4. Is possible.

  Further, the illumination device receptacle 28 is not necessarily installed on the ceiling as shown in FIG. 1, and the LED illumination according to the present invention is applied even when the illumination device receptacle is installed on a wall surface or a floor surface. The attachment 1 can be mounted.

As an effect when using the LED illumination attachment 1 as described above, there are the following advantages.
(1) Variations in LED brightness and emission color are small. In the driving method in which a constant voltage is applied to the LED as in the configuration of the conventional example, the driving current fluctuates due to variations in the forward voltage Vf of the LED, and variations in luminance and emission color tend to occur. On the other hand, the LED illumination attachment 1 of the present embodiment supplies a constant constant voltage to the LED module 4, so that there is almost no variation in the luminance and emission color of the LED.
(2) The power loss of the LED drive circuit is small. In a driving method in which a constant voltage is applied to an LED, a resistor is often used to obtain a predetermined driving current. In this case, a power loss occurs in the resistor, so that the power supply utilization efficiency is lowered (generally 50% or less), and the power saving characteristic inherent in LED lighting cannot be fully utilized. On the other hand, the LED illumination attachment 1 of the present embodiment supplies a constant current to the LED module 4 by a switching method that does not use a resistor, so that the power loss of the drive circuit can be made extremely small.
(3) It is easy to realize downsizing of the LED drive circuit. Since the LED illumination attachment 1 of the present embodiment can include the main part of the drive circuit in the integrated circuit, the number of components is small and the drive circuit can be easily downsized. For this reason, the freedom degree of design of the whole LED lighting apparatus and the freedom degree of external appearance design can be raised.
(Embodiment 2)
FIG. 5 is a cross-sectional view showing the structure of an LED illumination attachment or the like according to the second embodiment of the present invention. FIG. 6 is a circuit diagram of an LED driving circuit built in the LED illumination attachment of FIG. FIG. 7 is a functional block diagram centering on the switch IC of the LED drive circuit of FIG. FIG. 8 is a waveform diagram showing waveforms of voltages and currents at various parts in the functional block diagram of FIG.

  The LED illumination attachment of the present embodiment is obtained by adding a function (constant current setting means or the like) for changing and setting the LED drive current (a constant current supplied to the LED module) to the LED illumination attachment of the first embodiment. . Since other basic configurations and functions are the same, description thereof is omitted. In each figure, elements having the same functions as those in the first embodiment are denoted by the same reference numerals.

  As shown in FIG. 5, the operation part (trimmer) 7 of the constant current setting means for changing and setting the value of the constant current supplied to the LED module 4 is one side of the case of the LED illumination attachment 1 (the side in the example shown). ). When the operation unit 7 is rotated, the value of the constant current supplied to the LED module 4 is changed as described below.

  As shown in the circuit diagram of FIG. 6, a resistor 20a and a variable resistor 20b for dividing the control power supply voltage (output of the control power supply circuit 27) are provided, and a terminal for inputting the divided voltage is provided in the switch IC 17. Yes. The variable resistor 20b corresponds to the constant current setting means described above. The switch IC 17 performs control to change the peak value IDP of the drain current ID of the switching element 14 according to the input voltage of this terminal. This control will be described in detail with reference to the block diagram of FIG.

  As shown in FIG. 7, a sense device 14A for detecting a drain current connected in parallel with the switching element 14 and a sense resistor SR connected between the source terminal and the ground are added. The voltage corresponding to the voltage drop caused by the sense resistor SR is input to the drain current detection circuit 16 as a detection value corresponding to the drain current. However, as in the first embodiment, the drain-source voltage of the switching element 14 may be input to the drain current detection circuit 16 as a detection value corresponding to the drain current.

  The drain current detection circuit 16 is composed of a comparator that compares an input detection value with a reference voltage Vsn. The reference voltage Vsn is a voltage obtained by dividing the control power supply voltage Vcc by the resistor 20a and the variable resistor 20b. is there.

  Therefore, when the operation part of the variable resistor 20b which is a constant current setting means is operated, the resistance value of the variable resistor 20b changes and the reference voltage Vsn changes. When the resistance values of the resistor 20a and the variable resistor 20b are Rc and Ra, respectively, Vsn = Vcc · Rc / (Ra + Rc). When Vsn changes, the drain current ID when the output of the comparator constituting the drain current detection circuit 16 is inverted, that is, the peak value IDP changes.

  For example, when the resistance value Ra of the variable resistor 20b is operated in the direction of decreasing, the reference voltage Vsn decreases. Therefore, the output of the comparator is inverted at a lower peak value IDP, and the switching element 14 is turned off. As a result, the average value (output value of constant current) ILO of the drive current IL becomes small. Conversely, when the resistance value Ra of the variable resistor 20b is manipulated in the direction of increasing, the reference voltage Vsn increases, the output of the comparator is inverted at a higher peak value IDP, and the switching element 14 is turned off. As a result, the average value (output value of constant current) ILO of the drive current IL increases.

  The waveform diagram of FIG. 8 shows a state where the peak value IDP of the drain current ID is changed (reduced) in two stages. It can be seen that when the peak value IDP is changed, the average value (constant current output value) ILO of the drive current IL also changes accordingly.

  According to the LED illumination attachment 1 of the present embodiment, it is possible to replace and use a plurality of types of LED modules 4 having different rated currents of the LED device 5. That is, the drive current (constant current output value) can be changed and set using the constant current setting means (variable resistor 20b) so as to match the rated current of the LED device 5 mounted in each LED module 4. Therefore, if there is one LED illumination attachment 1, a plurality of types of LED modules 4 can be handled.

  The variable resistor 20b may be a rotary operation type or a slide operation type. Alternatively, the reference voltage Vsn may be configured to be changed using a push button switch (increase / decrease switch) and an electronic volume constituted by a microcomputer or a dedicated circuit. In this case, the reference voltage Vsn may be changed and set by remote operation using infrared communication or the like. If such a constant current setting means is operated with respect to the same LED module 4, it can also be used as a dimming function of the LED lighting apparatus.

The following advantages can be given as effects when the LED illumination attachment of the present embodiment is used.
(1) A general-purpose LED illumination attachment that can support a plurality of LED modules can be realized. Since the drive current (constant current value) supplied to the LED module can be changed and set, a plurality of types of LED modules having different rated currents can be replaced with the same LED illumination attachment. In addition, driving that maximizes the performance of the LED module is possible.
(2) A dimming function can be added. If the drive current is changed for the same LED module, the brightness of the LED can be adjusted. Therefore, if the attachment for LED illumination of this embodiment is used, it can be easily realized to add a dimming function to the LED illumination device.
(Embodiment 3)
FIG. 9 is a cross-sectional view showing the structure of an LED illumination attachment or the like according to the third embodiment of the present invention. The LED illumination attachment of the present embodiment has a base similar to that of an incandescent bulb, and has a structure in which the drive circuit described in the above-described embodiment is incorporated. In FIG. 9 showing the cross-sectional structure, elements having the same functions as those of the above-described embodiments are denoted by the same reference numerals.

  As described in the first embodiment, the driving circuit of the LED illumination attachment 1 can include the main part in the integrated circuit, so that the number of components is small and the driving circuit can be easily downsized. Therefore, as shown in FIG. 9, the LED illumination attachment 1 of the present embodiment is configured such that a part of the case is configured by a base 22 similar to an incandescent bulb, and an electronic component 8 or the like configuring a drive circuit is mounted therein. The control component mounting board 6 is incorporated. The base 22 and the control component mounting board 6 are electrically connected by two electric wires WR. The constant current output terminal 3 is provided on the surface (lower surface) of the case opposite to the base 22 as in the above-described embodiment.

  The LED illumination attachment 1 having the above-described structure is used by screwing a cap 22 into an incandescent bulb socket 21 installed on a ceiling 9 or the like of a room. A commercial AC voltage is supplied from the indoor wiring 10 to the drive circuit of the LED illumination attachment 1 through the incandescent lamp socket 21 and the base 22. The configuration and operation of the drive circuit are the same as those in the above-described embodiment, and a circuit diagram and description thereof are omitted.

The following advantages can be given as effects when the LED illumination attachment 1 of the present embodiment is used. That is, since the LED lighting attachment 1 is directly screwed into the incandescent light bulb socket 21 installed on the ceiling or wall surface of the room, it can be easily attached without requiring special electrical work and can be easily removed. It is. An LED lighting apparatus having a high degree of freedom in design and appearance can be realized by combining a compact LED illumination attachment 1 in which a drive circuit is built in the base and the LED module.
(Embodiment 4)
FIG. 10 is a block diagram of a drive circuit for an LED illumination attachment according to the fourth embodiment of the present invention. FIG. 11 is a waveform diagram showing waveforms of voltages or currents at various parts in the block diagram of FIG. The LED illumination attachment of this embodiment is slightly different from the above-described embodiment in the configuration of a built-in drive circuit. Hereinafter, only the difference between the drive circuit of the LED illumination attachment of the present embodiment and the drive circuit of the above-described embodiment will be described.

  First, the connection position of the switching element 14 and the LED module 4 is different. That is, in the drive circuit described above, the coil 11 and the LED module 4 are connected to the high potential side of the DC voltage Vin, and the switching element 14 is connected to the low potential side thereof. is there. As can be seen from FIG. 10, the switching element 14 is connected to the high potential side of the DC voltage Vin, the cathode of the coil 11 and the FRD 12 is connected to the source side, and the other end of the coil 11 is connected to the anode side of the LED module 4. Has been. The cathode side of the LED module and the anode side of the FRD 12 are at ground (GND) potential.

  The order of series connection of the coil 11 and the LED module 4 is such that the source side terminal of the switch IC 17 and the anode terminal of the LED module 4 are connected, the cathode terminal of the LED module 4 is connected to the coil 11, and the other end of the coil 11 is grounded. It may be a (GND) potential. In these connection circuits, the switching element is connected to the high potential side of the constant current output terminal 3. The drain-source voltage VD of the switching element 14 changes as shown in FIG. 11 with respect to the DC voltage Vin. The waveform diagram of FIG. 11 shows a state in which the peak value IDP of the drain current ID is changed (reduced) in two stages, similarly to the waveform diagram of FIG.

  Next, in the drive circuit according to the present embodiment, an externally operable switch 35 for forcibly turning off the switching element 14 by short-circuiting the output line (Vcc) of the control power supply circuit 27 and the ground line is added. ing. When the output line (Vcc) of the control power supply circuit 27 becomes the ground potential by the operation of turning on the switch 35, the switch IC 17 is not in an operable state but in a switching stopped state. As a result, the switching element 14 is forcibly turned off. In this state, since both the constant current output terminals 3 are at a low potential, when removing the LED module 4 from the LED illumination attachment 1 for replacement of the LED module 4 or the like, there is no risk of electric shock. Can work on. Other basic configurations of the drive circuit are the same as those of the above-described embodiment.

The following advantages can be given as effects when the LED illumination attachment of the present embodiment is used. That is, the operation of removing the LED module from the LED illumination attachment can be performed safely. If the operation of removing the LED module after performing the operation of forcibly turning off the switching element 14 is performed, both the constant current output terminals 3 are at a low potential, so there is no fear of electric shock.
(Embodiment 5)
FIG. 12: is sectional drawing which shows structures, such as an attachment for LED lighting concerning the 5th Embodiment by this invention. In FIG. 12, elements having the same functions as those in the above-described embodiment are denoted by the same reference numerals. As shown in FIG. 12, the LED illumination attachment 1 of the present embodiment is different from the above-described embodiment in that the power input terminal 2 and the constant current output terminal 3 are on the same surface of the case (the upper surface in the illustrated example). ). With such a structure, it is possible to easily realize an indirect illumination type LED illumination device that irradiates a surface (for example, a ceiling surface) to which a receptacle for an illumination device is attached with the LED module 4 and illuminates the room with the reflected light. Can do.

  In the example shown in FIG. 12, the reflecting plate 37 is provided on the ceiling surface, and the light flux 29 irradiated upward from the LED module 4 is reflected by the reflecting plate 37 to become indoor illumination light. However, the reflection plate 37 is not essential and may be natural reflection by a ceiling surface or a wall surface. Moreover, the structure and shape of the LED module 4 are not limited to those illustrated in FIG. 12, and can be freely designed.

The following advantages can be given as effects when the LED illumination attachment of the present embodiment is used. That is, it is possible to easily realize an indirect illumination type LED illumination device that irradiates light from an LED module attached to an LED illumination attachment toward a ceiling or a wall and illuminates the room with the reflected light. Such indirect illumination can provide a lighting effect according to the place.
(Embodiment 6)
FIG. 13: is sectional drawing which shows structures, such as an attachment for LED lighting concerning the 6th Embodiment by this invention. In FIG. 13, elements having the same functions as those in the above-described embodiment are denoted by the same reference numerals. The attachment 1 for LED illumination of this embodiment is provided with the indicator (displays, such as small LED) 30 which notifies the replacement time of the LED module 4 on one side (in the example of illustration) of a case. In addition, a timer circuit 34 for measuring the usage time of the LED module 4 is mounted on the control component mounting board 6. The indicator 30 is lit by the output.

  In general, the lifetime of the LED module 4 is much longer than incandescent bulbs and fluorescent lamps. However, the life of the LED module 4 is shorter than that of the LED illumination attachment 1, and it is necessary to replace it with a new one if the luminance decreases due to deterioration. However, since the luminance gradually deteriorates and the luminance decreases, it is not easy to determine the replacement time. Therefore, the LED lighting attachment 1 of the present embodiment measures (integrates) the usage time of the LED module 4 by the timer circuit 34, and indicates that the replacement time of the LED module 4 has been reached when the integrated value reaches a predetermined time. The user is notified by turning on 30.

  The integrated value of the timer circuit 34 needs to be reset when the LED module 4 is replaced. For example, it is preferable to provide a push button switch for reset operation on the contact surface 25 of the case of the LED illumination attachment 1. In this way, it is possible to avoid the possibility that the timer circuit 34 is reset by accidentally pressing the push button switch. Alternatively, the timer circuit 34 can be automatically reset upon detecting that the LED module 4 has been removed. Moreover, the display of the replacement time by the indicator 30 is not limited to the lighting display but may be a blinking display, and the replacement time can be displayed by various other methods.

The following advantages can be given as effects when the LED illumination attachment of the present embodiment is used. That is, the life deterioration of the LED module can be managed by integrating the usage time, and the user can be notified that the replacement time has come. This facilitates early replacement before the brightness of the LED module is greatly reduced.
(Embodiment 7)
FIG. 14: is sectional drawing which shows structures, such as an attachment for LED lighting concerning the 7th Embodiment by this invention. The attachment for LED illumination of Embodiment 2 mentioned above can respond | correspond to several types of LED module from which a rated current differs by having the function to change and set a drive current. The LED device cannot be driven with a current larger than the current value determined as the absolute maximum rating, and if the LED device is driven with a current higher than the maximum drive current, the LED device may be destroyed. Therefore, when the drive current is changed and set with the LED illumination attachment of Embodiment 2, it is necessary to carefully check the absolute maximum rating of the LED module to be used in advance.

  The LED illumination attachment according to the present embodiment can automatically set an appropriate drive current while avoiding the risk of setting errors associated with manual drive current change setting as described above. Such automatic setting of the drive current according to the type of the LED module is performed by the switch component 32 and its push button 33 and the operation protrusion 31 provided in the LED module 4 shown in FIG.

  In the example shown in FIG. 14, a switch component 32 is mounted on the control component mounting board 6 of the LED illumination attachment 1, and the switch component 32 includes three push buttons 33. Three contact points correspond to the three push buttons 33, and eight states can be set by combinations of these on / off states. Further, three through holes HL are provided at positions corresponding to the three push buttons 33 on the contact surface 25 side of the case.

  On the other hand, an operation protrusion 31 is erected on the surface of the LED module 4 on which the constant current input terminal 3A is provided (upper surface in the illustrated example). When the LED module 4 is mounted on the LED illumination attachment 1, the operation protrusion 31 enters the inside through the through hole HL of the case of the LED illumination attachment 1, and the tip of the operation projection 31 comes into contact with the push button 33. Press. The operation protrusions 31 are provided in a combination of a position and a number corresponding to the rank of the rated drive current of the LED device 5 of the LED module 4. Depending on the combination of the presence or absence of the three operation protrusions 31, it is possible to correspond to eight ranks. When at least one operation protrusion 31 is provided for detecting the attachment / detachment state, it is possible to correspond to seven ranks.

  With the configuration as described above, when the LED module 4 is mounted on the LED illumination attachment 1, the LED illumination attachment 1 detects the LED from the signals of the three contacts corresponding to the three push buttons 33 of the switch component 32. The rank information of the rated drive current of the LED device 5 of the module 4 can be acquired, and an appropriate drive current (output current) can be automatically set. Although a description of a specific configuration for automatically setting is omitted, for example, three contact signals of the switch part 32 are input to the microcomputer, and as described as a modification of the second embodiment, the microcomputer What is necessary is just to comprise so that the reference voltage Vsn may be changed and set using the electronic volume comprised by these.

  The following advantages can be given as effects when the LED illumination attachment of the present embodiment is used. That is, when the LED module is attached to the LED illumination attachment, the drive current (constant current) supplied to the LED module is automatically set, so that a setting error that may occur when manually setting the drive current The risk of breaking the LED module can be avoided.

  As mentioned above, although various embodiment of this invention was described with each modification, this invention can be implemented combining these embodiment and modification arbitrarily, or changing suitably.

  The LED illumination attachment of the present invention is particularly useful for easily realizing an LED illumination device that can be directly attached to a receptacle for an illumination device or a socket for an incandescent light bulb that has been conventionally installed in general households.

It is sectional drawing which shows structures, such as an attachment for LED lighting concerning the 1st Embodiment of this invention. It is a circuit diagram of the LED drive circuit built in the attachment for LED illumination of FIG. FIG. 3 is a functional block diagram centering on a switch IC of the LED drive circuit of FIG. 2. FIG. 4 is a waveform diagram showing waveforms of voltages and currents at various parts in the functional block diagram of FIG. 3. It is sectional drawing which shows structures, such as an attachment for LED lighting concerning the 2nd Embodiment by this invention. It is a circuit diagram of the LED drive circuit built in the attachment for LED illumination of FIG. It is a functional block diagram centering on switch IC of the LED drive circuit of FIG. It is a wave form diagram which shows the waveform of the voltage of each part in the functional block diagram of FIG. It is sectional drawing which shows structures, such as an attachment for LED lighting concerning the 3rd Embodiment by this invention. It is a block diagram of the drive circuit of the attachment for LED illumination which concerns on 4th Embodiment by this invention. It is a wave form diagram which shows the waveform of the voltage or electric current of each part in the block diagram of FIG. It is sectional drawing which shows structures, such as an attachment for LED lighting concerning the 5th Embodiment by this invention. It is sectional drawing which shows structures, such as an attachment for LED lighting concerning the 6th Embodiment by this invention. It is sectional drawing which shows structures, such as an attachment for LED lighting concerning the 7th Embodiment by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 LED illumination attachment 2 Power input terminal 2A Power supply terminal 3 Constant current output terminal 3A Constant current input terminal 4 LED module 5 LED device 6 Control component mounting board 7 Operation part of constant current setting means 8 Electronic component 11 Coil 12 Regenerative diode 13 Diode bridge 14 Switching element 15 Switching element control circuit 16 Current detection circuit 17 Switch IC
18a, 18b Capacitor 19 Line filter 20a Resistor 20b Variable resistor 21 Incandescent bulb socket 22 Base 23 LED device mounting substrate 24 LED module lens 25 Contact surface with attachment LED module 27 Control power circuit 28 Lighting device receptacle 29 Reflected illumination Luminous flux 30 LED module life display indicator 31 Operation protrusion (operation part)
32 Switch parts (rated current detector)
33 Push button 34 Timer circuit 35, 36 Switch

Claims (10)

  1. A case provided with a power input terminal electrically connected to the commercial power supply line and a constant current output terminal connected to the LED module; and power supplied from the power input terminal incorporated in the case A driving circuit that generates a constant current for LED driving and outputs the constant current to the constant current output terminal;
    The drive circuit includes a switching element connected in series to the LED module, an energy storage device that stores electrical energy as magnetic energy, and magnetic energy stored in the energy storage device when the switching element is turned off. A regenerative diode for continuing the current from the LED module to flow through the LED module, a current detection circuit for detecting a current flowing through the switching element, and on / off of the switching element based on a predetermined clock and an output of the current detection circuit look including a switching element control circuit for controlling,
    The LED is characterized in that the power input terminal is provided so as to protrude from the surface of the case, and the constant current output terminal is a concave terminal provided in a hole formed in the surface of the case. Attachment for lighting.
  2. The LED illumination attachment according to claim 1, wherein the power input terminal and the constant current output terminal are respectively disposed on opposite surfaces of the case.
  3. The LED illumination attachment according to claim 1, wherein the power input terminal and the constant current output terminal are provided on the same surface of the case.
  4. LED according to any one of claims 1-3 in which the constant current setting means for changing and setting the value of the constant current for LED drive output to the constant current output terminal by the drive circuit is provided Attachment for lighting.
  5. The LED illumination attachment according to claim 4 , wherein an operation portion of a circuit component constituting the constant current setting means is provided on a surface of the case.
  6. Wherein the said switching element is connected to the high potential side of the constant current output terminal, LED forcibly any one of claims 1 to switch to turn off is provided 5 the switching device by an external operation Attachment for lighting.
  7. A timer circuit for measuring the usage time of the LED module electrically connected to the constant current output terminal; and an indicator for indicating that the replacement time of the LED module has come based on the output of the timer circuit. The attachment for LED lighting of any one of Claim 1 to 6 .
  8. Of the surface of the case, at least a contact surface with the LED module is formed of a material having high thermal conductivity, and heat generated in the LED module when the LED module is mounted on the LED illumination attachment is The attachment for LED lighting of any one of Claim 1 to 7 comprised so that heat may be radiated | emitted via a contact surface.
  9. The attachment for LED lighting of any one of Claim 1 to 8 with which the electronic component which comprises the said drive circuit is mounted in the metal base substrate with high heat conductivity.
  10. The LED module is provided with an operation unit having a specific shape determined according to the rank of the rated drive current, and the LED illumination attachment is operated by the operation unit when the LED module is mounted. A rated current detection unit that outputs a unique signal determined according to the rank of the rated drive current is provided, and a constant current value to be output to the constant current output terminal is automatically set according to the output of the rated current detection unit. The attachment for LED lighting of any one of Claim 1 to 9 comprised .
JP2005307560A 2005-10-21 2005-10-21 LED lighting attachment Expired - Fee Related JP4791794B2 (en)

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