JP2010198791A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire for having high efficiency while obtaining high rendering properties, and also economically advantageous. <P>SOLUTION: A reference value IF1 to determine a constant current passing through an LED lighting lamp 26 by the constant current control part 272 of a control part 27, and a reference value IF2 for obtaining a constant current larger than the constant current determined by this reference value IF1 is selectively set. Thereby, the LED lighting lamp 26 using a high efficiency type LED element obtains highly efficient optical output by setting this reference value IF1, and the LED lighting lamp 26 using an LED element of a high rendering property type obtains high optical output having high rendering properties by setting the reference value IF2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a luminaire using a semiconductor light emitting element such as a light emitting diode (LED element) as a light source.

  Recently, there is a lighting fixture that uses a plurality of LED elements connected in series and parallel as a light source (Patent Document 1). By the way, as a lighting fixture using such an LED element as a light source, one using a high-efficiency type LED element and one using a high color rendering LED element are known. Here, the high-efficiency type LED element generally provides a blue chip on a substrate and generates white light by passing light from the blue chip through a yellow phosphor. In the high color rendering type LED element, white light having high color rendering properties is generated by passing light from a blue chip through a phosphor in which a red phosphor and a green phosphor are further mixed with a yellow phosphor. For this reason, while a high-efficiency type LED element can easily obtain a large light output, a high color-rendering type LED element has better color rendering than a high-efficiency type LED element. When used, the wavelength range of the excitation spectrum is wide, and not only the emission color of the blue chip but also the light in the emission region of the yellow illuminant tends to be absorbed and the light output for use in excitation tends to be small. And the lighting fixture using the LED element of these high efficiency type or high color rendering property type is used properly according to a use, respectively.

JP 2008-055695 A

  In general, the high-efficiency type and the high color rendering type are distributed as one of a plurality of variation products using lighting devices having the same electrical characteristics of the instrument shell and the power supply circuit.

  However, when a light source using an LED element is used as a lighting fixture, the difference in light output between the high efficiency type and the high color rendering property type may be large, especially in a lighting fixture with a high light output. There is a possibility that the degree of freedom of the sex-type application is difficult to spread. Therefore, it is desired that even if the color rendering property type is high, it is difficult to cause a difference in light output from a high-efficiency type lighting fixture.

  And, in a high color rendering type LED element, it may be possible to use a dedicated blue chip so that the light output is increased, but this requires the necessity of having a plurality of blue chips depending on the product variation. Variations and quality control may become complicated.

  The present invention has been made in view of the above circumstances, and achieves a relatively high light output even in a type having a high color rendering property in an illumination device that implements a plurality of variations on the light emission principle of the same type of semiconductor light emitting element. An object of the present invention is to provide a lighting apparatus that can be used and can be widely used.

To solve the above problem,
The invention according to claim 1 is a DC output generating means for generating a DC output, a high-efficiency type or high color rendering type semiconductor light emitting element that is lit by a DC output generated by the DC output generating means, and the semiconductor Among the light emitting elements, in the case of a high color rendering type semiconductor light emitting element, it is provided with a light output control means for controlling the amount of current supplied to be increased as compared with a high efficiency type semiconductor light emitting element. It is said.

  In the present invention, a chip-shaped element, for example, a blue chip-shaped chip that emits blue light, can be suitably used as the semiconductor element, but elements other than the chip-shaped element can also be used. Further, in order to emit white light, it is preferable to combine a yellow phosphor and a blue chip, but instead, a chip emitting ultraviolet light is excited by ultraviolet light to emit blue, red, and green light. It is also possible to use a phosphor in which blue phosphor powder, red phosphor powder, and green phosphor powder are mixed.

  In the present invention, the high efficiency type and the high color rendering type semiconductor light emitting element share the same light source, but the high color rendering type semiconductor light emitting element has a color rendering property as compared with the high efficiency type semiconductor light emitting element. A means to improve is added separately. For example, in the case of a blue chip, in order to emit white light if it is a highly efficient semiconductor light emitting device, a phosphor mixed with a yellow phosphor powder that is excited by blue light and emits yellow light is combined. On the other hand, in the high color rendering type semiconductor light emitting device, in addition to using the same blue chip as the high efficiency type and the phosphor mixed with the yellow phosphor powder, the color rendering property is improved. Red phosphor powder and green phosphor powder are further mixed into the phosphor.

  According to a second aspect of the present invention, in the first aspect of the invention, the light output control means includes a constant current control means for controlling a constant current to flow to the semiconductor light emitting element, and the constant current control. The means has a first reference value and a second reference value for determining a constant current value to be passed through the semiconductor light emitting element, and the second reference value with respect to the current value determined by the first reference value. The current value determined by is set in a range not less than the current value determined by the first reference value and not more than the allowable current of the semiconductor light emitting element.

  According to the present invention, the high color rendering property of the high color rendering property semiconductor light emitting device compared to the high efficiency type semiconductor light emitting device is controlled by the light output control means so as to increase the amount of current. The lighting fixture can be easily obtained. Thereby, even if it is a highly color-rendering lighting fixture, the freedom degree of an application can be enlarged.

  According to the present invention, the constant current control means is used as the light output control means, and the first reference value and the second reference value for determining the current value flowing through the semiconductor light emitting element by the constant current control means are the first reference value and the second reference value. By setting the reference value of 2 within a range not less than the current value determined by the first reference value and not more than the allowable current of the semiconductor light emitting device, high color rendering properties and high efficiency can be obtained for the same type of semiconductor light emitting device. Even if it implements using, the malfunction by each semiconductor light-emitting device will not arise, and it will become easy to realize a plurality of variations. In addition, in order to obtain a high color rendering luminaire with high light output, the basic components of the luminaire using a highly efficient semiconductor light emitting element and the power supply device can be made common, which is economically advantageous.

The perspective view of the lighting fixture concerning the 1st Embodiment of this invention. Sectional drawing of the lighting fixture concerning 1st Embodiment. The figure which shows schematic structure of the power supply device applied to the lighting fixture of 1st Embodiment. The figure which shows the specific circuit example of the output control part applied to 1st Embodiment. The figure which shows the relationship between the electric current of an LED element of the high efficiency type applied to 1st Embodiment, and a high color rendering property type, and a light beam. The figure which shows schematic structure of the LED element applied to 1st Embodiment.

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

(First embodiment)
First, the lighting fixture to which the power supply device of the present invention is applied will be briefly described. 1 and 2, reference numeral 1 denotes an instrument body, and the instrument body 1 is made of aluminum die casting and has a cylindrical shape with both ends opened. The appliance body 1 is internally divided into three in the vertical direction by partition members 1 a and 1 b, and a space between the lower opening and the partition member 1 a is formed in the light source unit 2. The light source unit 2 is provided with a plurality of LEDs 2a and reflectors 2b as semiconductor light emitting elements. The plurality of LEDs 2a are arranged and mounted at equal intervals along the circumferential direction of a disk-shaped wiring board 2c provided on the lower surface of the partition member 1a.

  A space between the partition members 1 a and 1 b of the instrument body 1 is formed in the power supply chamber 3. In the power supply chamber 3, a wiring board 3a is disposed on the partition member 1a. The wiring board 3a is provided with each electronic component constituting a power supply device for driving the plurality of LEDs 2a. The DC power supply device and the plurality of LEDs 2 a are connected by lead wires 4.

  A space between the partition plate 1 b of the instrument body 1 and the upper opening is formed in the power supply terminal chamber 5. In the power terminal room 5, a power terminal block 6 is provided on the partition plate 1b. This power supply terminal block 6 is a terminal block for supplying AC power of commercial power to the power supply device in the power supply chamber 3, and serves as a power cable terminal portion on both sides of the box 6a made of electrically insulating synthetic resin. It has an insertion port 6b, an insertion port 6c serving as a feed cable terminal, a release button 6d for separating the power line and the feed line, and the like.

  FIG. 3 shows a schematic configuration of a power supply device incorporated in the power supply chamber 3 of the lighting fixture thus configured.

  In FIG. 3, 11 is an AC power source, and this AC power source 11 is a commercial power source (not shown). The AC power supply 11 is connected to an input terminal of a full-wave rectifier circuit 12. The full wave rectification circuit 12 generates an output obtained by full wave rectification of the AC power from the AC power supply 11.

  A boost chopper circuit 13 is connected to the full-wave rectifier circuit 12 as a power supply means. In this step-up chopper circuit 13, a series circuit of a first inductor 14 constituting a step-up transformer and a field effect transistor 15 as a switching element is connected between the positive and negative output terminals of the full-wave rectifier circuit 12. An electrolytic capacitor 17, which is a smoothing capacitor, is connected in parallel with 15 through a flywheel diode 16 of the illustrated polarity. A series circuit of resistors 18 and 19 is connected to both ends of the electrolytic capacitor 17 as voltage detecting means. The resistors 18 and 19 generate a divided voltage from the output of the electrolytic capacitor 17, and output the terminal voltage of the resistor 19 to the control unit 27. The field effect transistor 15 is turned on / off based on a comparison result between the terminal voltage of the resistor 19 in the control unit 27 and a reference voltage prepared in advance. The first inductor 14 generates a boosted output in the electrolytic capacitor 17 via the flywheel diode 16 due to the accumulation and release of electromagnetic energy accompanying the on / off operation of the field effect transistor 15. The control unit 27 will be described later.

  The step-up chopper circuit 13 is connected to a step-down chopper circuit 20 as output generating means. In the step-down chopper circuit 20, a series circuit of a field effect transistor 21 as a switching element, a flywheel diode 22, and a resistor 23 as load current detection means is connected to both ends of the electrolytic capacitor 17. A series circuit of a second inductor 24 and a smoothing capacitor 25 is connected to both ends of the flywheel diode 22. The resistor 23 detects a load current flowing in the LDE illumination lamp 26 described later, and outputs this detection output to the control unit 27. The field effect transistor 21 is turned on / off based on a comparison result between a load current detected by the resistor 23 in the control unit 27 and a reference value prepared in advance, and the current flowing through the LDE lamp 26 is controlled to be constant (constant current). Control. The second inductor 24 generates a DC output that is stepped down across the capacitor 25 due to the accumulation and release of electromagnetic energy associated with the on / off operation of the field effect transistor 21.

  An LDE illumination lamp 26 (corresponding to the LED 2a in FIG. 1) is connected to the step-down chopper circuit 20. This LDE illumination lamp 26 has a plurality of LED elements connected in series as semiconductor light emitting elements. In this case, the LDE illumination lamp 26 may be a series circuit in which a plurality of LED elements are connected in series and a plurality of LDE lighting lamps 26 connected in parallel.

  Here, the LED element will be briefly described. The LED elements 262 shown in FIG. 6 are arranged around the central portion of the light source substrate 261 at regular intervals, that is, at intervals of 60 degrees. These LED elements 262 are formed to have a plurality of LED chips 262a, a reflector 262b, and a translucent sealing member 262c. For example, LED chips that emit blue light are used as the LED chips 262a, and these are mounted on one surface of the light source substrate 261 on which a conductor pattern (not shown) is formed, for example, by flip chip mounting. Each LED chip 262a may be mounted by wire bonding. In this latter mounting, each LED chip 262a is die-bonded to the light source substrate 261 while avoiding the conductor pattern, and the terminals of the LED chip 262a and the conductor pattern are connected to each other by a bonding wire provided by wire bonding. Made by. The mounted LED chips 262a are connected to each other in series, and are turned on all at once by a power supply device (not shown).

  The reflector 262b is formed in a frame shape with, for example, white synthetic resin, and surrounds each LED chip 262a and is attached to the light source substrate 261 with an adhesive. The inner peripheral surface of the reflector 262b is formed as a tapered surface that gradually becomes larger in diameter as the distance from the light source substrate 261 increases.

  The sealing member 262c is made of, for example, a translucent resin, specifically a transparent silicone resin, and a phosphor is mixed in the sealing member 262c. The sealing member 262c is filled in the reflector 262b to seal the LED chip 262a. The phosphor mixed in the sealing member 262c is excited by the blue light emitted from the LED chip 262a and emits light of a predetermined wavelength, for example, a complementary color with respect to the blue light. A phosphor that mainly emits some yellow light is used. Accordingly, each LED element 262 using the LED chip 262a as a point-like primary light source projects white light from the sealing member 262c serving as a planar secondary light source.

  In addition, although FIG. 6 described the high efficiency type LED element, the basic configuration of the high color rendering type LED element is the same as that of the high efficiency type LED element. A phosphor in which a red phosphor powder is mixed in addition to the phosphor is used. Further, the LED element 262 may be one in which the reflector 262b is omitted. In this case, the sealing member 262c is provided by potting on the light source substrate 261, and thereby the LED chip 262a can be filled and sealed.

  The control unit 27 controls the entire power supply apparatus, and includes a power supply output control unit 271 and a constant current control unit 272 that constitutes an optical output control unit. The power supply output control unit 271 stores a reference voltage (not shown) and controls the on / off operation of the field effect transistor 15 based on the comparison result between the reference voltage and the terminal voltage of the resistor 19. A boosted output voltage is generated across the electrolytic capacitor 17 by the accumulation and release of electromagnetic energy in the first inductor 14 accompanying the on / off operation. The constant current control unit 272 can selectively set the reference value IF1 as the first reference value and the reference value IF2 as the second reference value. From the selected reference value IF1 (or IF2) and the resistor 23, Based on the result of comparison with the detected load current, the field effect transistor 21 is turned on and off to determine a constant current to be supplied to the LDE illumination lamp 26.

  FIG. 4 shows a specific circuit example of the constant current control unit 272. In this case, the constant current control unit 272 includes a reference value setting unit 272a. In the reference value setting unit 272a, a voltage dividing circuit composed of a series circuit of resistors 29 and 30 and a voltage dividing circuit composed of a series circuit of resistors 31 and 32 are connected in parallel to both ends of the DC power supply 28. The connection point of the resistors 29 and 30 is connected to the collector of the NPN transistor 34 via the resistor 33, the connection point of the resistors 31 and 32 is connected to the base of the NPN transistor 34, and the PNP transistor 34. Are connected to a connection point between the resistor 30 and the DC power supply 28. The terminals t1 and t2 are connected to both ends of the resistor 32. These terminals t1 and t2 can be short-circuited. When the terminals t1 and t2 are opened, the PNP transistor 34 is turned on, and the resistor 33 is connected to the resistor 30 of the resistors 29 and 30 of the voltage dividing circuit. In parallel connection, the terminal voltage of the parallel circuit of the resistors 30 and 33 is output as the reference value IF1, and in a state where the terminals t1 and t2 are short-circuited, the PNP transistor 34 is turned off and the resistances 29 and 30 are divided. The terminal voltage of the resistor 30 of the voltage circuit is output as the reference value IF2.

  The relationship between these reference values IF1 and IF2 is as shown in FIG. 5A shows the relationship of the luminous flux (lm) to the current (IF) flowing through the high efficiency type LED element, and FIG. 5B shows the luminous flux (IF) flowing through the high color rendering type LED element (IF). lm). In the case of a high-efficiency type LED element, if the light output of the luminous flux 11 corresponding to the point A is obtained by constant current control by setting the reference value IF1, the reference value is obtained in the case of a high color rendering LED element. Constant current control by setting IF2 generates a light beam lm2 that is equal to the light beam lm1 at point B of the high-efficiency type LED element, so that a high output and high color rendering optical output can be obtained. In this case, when the reference value IF2 is set for the high efficiency type LED element, the light output of the higher luminous flux lm3 corresponding to the point C can be obtained.

  The setting range of the reference value IF2 is the upper limit that the constant current determined by the reference value IF2 is equal to or greater than the constant current determined by the reference value IF1 with respect to the constant current determined by the reference value IF1. It is set so as to fall within the range below the value IFmax. Here, the upper limit value IFmax is determined based on a place where the LED element 262 shown in FIG. In this embodiment, when the constant current determined by the reference value IF1 is 1, the reference value IF2 is set so as to obtain a constant current that is approximately 1.3 times that of 30% increase.

  Returning to FIG. 4, a comparator 36 is connected to the reference value setting unit 272a. In the comparator 36, the reference value IF1 or IF2 set by the reference value setting unit 272a is input to one terminal, the load current detected by the resistor 23 is input to the other terminal, and the comparison result is output. The switching control circuit 37 controls the switching drive of the field effect transistor 21 based on the comparison result of the comparator 36.

  A dimming signal generator 41 is connected to the controller 27. The dimming signal generating unit 41 generates a dimming signal having a different dimming depth from a PWM signal having a different duty ratio based on a dimming operation signal from the outside, and a reference of the control unit 27 based on the dimming operation signal. The reference value IF1 (or IF2) in the value setting unit 272a is varied to adjust the light output of the LDE illumination lamp 26.

  Next, the operation of the embodiment configured as described above will be described.

  First, when using a highly efficient type LED element for the LDE illumination lamp 26, in the reference value setting part 272a shown in FIG. 3, between the terminals t1 and t2 is left open. In this case, the voltage at the connection point between the resistors 31 and 32 is applied to the base of the NPN transistor 34, and the NPN transistor 34 is turned on. As a result, the resistor 33 is connected in parallel to the resistor 30 of the resistors 29 and 30 of the voltage dividing circuit, and the terminal voltage of the parallel circuit of these resistors 30 and 33 is output as the reference value IF1.

  In this state, the AC power of the AC power supply 11 is full-wave rectified by the full-wave rectifier circuit 12 and supplied to the boost chopper circuit 13. In the step-up chopper circuit 13, the field effect transistor 15 is turned on / off based on a comparison result between the terminal voltage of the resistor 19 and a reference voltage prepared in advance in the power supply output control unit 271, and the field effect transistor 15 is turned on / off. Accompanying the storage and release of electromagnetic energy of the first inductor 14, a boosted output voltage is generated in the electrolytic capacitor 17 via the flywheel diode 16.

  The output voltage of the step-up chopper circuit 13 is supplied to the step-down chopper circuit 20. In this case, in the constant current control unit 272 of the control unit 27, the reference value IF1 set by the reference value setting unit 272a is input to one terminal of the comparator 36, and the load current detected by the resistor 23 is input to the other input terminal. Is entered. The comparator 36 outputs a comparison result between the reference value IF1 and the load current, and the switching control circuit 37 performs switching driving of the field effect transistor 21 by a drive signal corresponding to the comparison result of the comparator 36.

  Thus, the field effect transistor 21 is driven by the switching control circuit 37 to be turned on / off, and the current flowing through the LDE illumination lamp 26 is controlled to a constant current determined by the reference value IF1. Also, an output voltage (DC output) that is stepped down at both ends of the capacitor 25 is generated by the accumulation and release of electromagnetic energy of the second inductor 24 accompanying the on / off operation of the field effect transistor 21, and the LDE illumination lamp is generated by this output voltage. 26 is lit. In this case, the high-efficiency type LED element constituting the LDE illumination lamp 26 is lighted with high efficiency by the light beam lm1 corresponding to the point A shown in FIG.

  Next, when a high color rendering LED element is used for the LDE illumination lamp 26, the terminals t1 and t2 are short-circuited in the reference value setting unit 272a shown in FIG. In this case, the base of the PNP transistor 34 is grounded and remains off. As a result, the terminal voltage of the resistor 30 among the resistors 29 and 30 of the voltage dividing circuit is output as the reference value IF2.

  Also in this case, in the step-up chopper circuit 13, the field effect transistor 15 is turned on / off based on the comparison result between the terminal voltage of the resistor 19 and a reference voltage prepared in advance, and the first effect associated with the on / off operation of the field effect transistor 15. A boosted output voltage is generated in the electrolytic capacitor 17 via the flywheel diode 16 by the accumulation and release of electromagnetic energy of the inductor 14.

  When the output voltage of the step-up chopper circuit 13 is supplied to the step-down chopper circuit 20, the constant current control unit 272 of the control unit 27 receives the reference value IF2 set by the reference value setting unit 272a at one terminal of the comparator 36. The load current detected by the resistor 23 is input to the other input terminal. The comparator 36 outputs a comparison result between the reference value IF2 and the load current, and the switching control circuit 37 performs switching driving of the field effect transistor 21 by a drive signal corresponding to the comparison result of the comparator 36.

  Thereby, the field effect transistor 21 is driven by the switching control circuit 37 to be turned on / off, and the current flowing through the LDE illumination lamp 26 is controlled to a constant current determined by the reference value IF2. Also, an output voltage (DC output) that is stepped down at both ends of the capacitor 25 is generated by the accumulation and release of electromagnetic energy of the second inductor 24 accompanying the on / off operation of the field effect transistor 21, and the LDE illumination lamp is generated by this output voltage. 26 is lit. In this case, the high color rendering LED element constituting the LDE illumination lamp 26 is turned on with high efficiency and high color rendering by the luminous flux lm2 (= lm1) corresponding to the point B shown in FIG.

  In addition, when a high-efficiency type LED element is used for the LDE illumination lamp 26 and the reference value setting unit 272a shown in FIG. 3 is short-circuited between the terminals t1 and t2, the reference value IF2 is output. The on-off operation of the field effect transistor 21 according to the comparison result between the reference value IF2 of the comparator 36 and the load current causes the high-efficiency type LED element constituting the LDE illumination lamp 26 to correspond to the point C shown in FIG. It is illuminated with high efficiency by the further high luminous flux lm3.

  Therefore, in this way, the constant current control unit 272 of the control unit 27 determines the constant current flowing through the LDE illumination lamp 26, and a constant current larger than the constant current determined by the reference value IF1 is obtained. The reference value IF2 can be selectively set, and by setting the reference value IF1, a high-efficiency light output can be obtained for the LDE illumination lamp 26 using a high-efficiency type LED element, and the reference value IF2 is set. Thus, the LDE illumination lamp 26 using a high color rendering type LED element can obtain a light output with high efficiency and high color rendering property that can obtain a light flux equivalent to that obtained from the high efficiency type LED element. Thus, by selecting the reference value IF2 even in the case of the LDE illuminating lamp 26 using a high color rendering type LED element, it is possible to easily obtain a high color rendering luminaire with high light output and high efficiency. The lineup of lighting fixtures can be expanded with the lighting fixtures and high color rendering lighting fixtures.

  In addition, the constant current control unit 272 has a reference value IF2 that is equal to or greater than a current value determined by the reference value IF1 among the reference value IF1 and the reference value IF2 for determining a current value to be passed through the LDE illumination lamp 26, and LDE lighting. Since the setting is made within the allowable current range of the LED element of the lamp 26, even if high color rendering properties and high efficiency are implemented by using LED elements of the same type and a slightly different type of phosphor, each LED The device does not suffer from heat and can easily realize a plurality of variations.

  Furthermore, in order to obtain a high color rendering luminaire, the basic configuration of the luminaire using a high-efficiency type LED element and the power supply can be made common, thereby realizing a high color rendering luminaire with high light output. Therefore, it is not necessary to prepare a special power supply device, and this can be economically advantageous.

  Furthermore, by selecting the reference value IF2 by the constant current control unit 272 for a lighting fixture using a high-efficiency type LED element, a lighting fixture with a higher luminous flux can be obtained. It can be expanded further.

  In addition, this invention is not limited to the said embodiment, In the implementation stage, it can change variously in the range which does not change the summary. For example, in the above-described embodiment, the control unit 27 has been described as an example of an analog circuit. However, a control unit using a microcomputer or a digital processing method can be used. Further, in order to increase the light output of the lighting fixture using the high color rendering type LED elements, the number of the plurality of high color rendering type LED elements constituting the LDE illumination lamp 26 may be increased. Even in this case, a highly efficient and highly color-rendering lighting apparatus can be realized. Furthermore, in the above-described embodiment, the example in which the constant current control unit is used as the light output control unit has been described. However, the light output control unit may be switched by a mechanical switch or changed in the multiplier setting of the electrical component. A device that increases the amount of current supplied to the semiconductor light emitting device can also be used. Furthermore, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and is described in the column of the effect of the invention. If the above effect is obtained, a configuration from which this configuration requirement is deleted can be extracted as an invention.

DESCRIPTION OF SYMBOLS 1 ... Instrument main body, 2 ... Light source part, 3 ... Power supply room 11 ... AC power supply, 12 ... Full wave rectifier circuit 13 ... Boost chopper circuit, 14 ... 1st inductor 15 ... Field effect transistor, 20 ... Buck chopper circuit 21 ... Field effect transistor, 24 ... second inductor 26 ... LDE lamp, 27 ... control unit, 271 ... power supply output control unit 272 ... constant current control unit, 272a ... reference value setting unit, 36 ... comparator 37 ... switching control circuit , 41 ... Dimming signal generator

Claims (2)

DC output generating means for generating a DC output;
A high-efficiency type or high color rendering type semiconductor light-emitting element that is turned on by a DC output generated by the DC output generating means;
Among the semiconductor light emitting elements, in the case of a high color rendering type semiconductor light emitting element, a light output control means for controlling the amount of current to be supplied as compared with a high efficiency type semiconductor light emitting element,
The lighting fixture characterized by comprising. The light output control means includes a constant current control means for controlling a constant current to flow to the semiconductor light emitting element, and the constant current control means determines a constant current value to be supplied to the semiconductor light emitting element. And a second reference value,
The current value determined by the second reference value is greater than or equal to the current value determined by the first reference value with respect to the current value determined by the first reference value, and the tolerance of the semiconductor light emitting element 2. The lighting apparatus according to claim 1, wherein the lighting apparatus is set within a range equal to or less than a current.

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