JP2016066487A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow the voltage-current characteristic of a series circuit to be changed after the manufacture of a series-parallel circuit.SOLUTION: A lighting device in an embodiment comprises a series-parallel circuit, a constant current circuit, and an element. The series-parallel circuit is a circuit in which a first series circuit in which a plurality of first light-emitting elements for emitting light with first color temperature are series connected is connected in parallel with a second series circuit in which a plurality of second light-emitting elements for emitting light with second color temperature different from the first color temperature are series connected. The constant current circuit converts supplied power and supplies constant current to the series-parallel circuit on the basis of a light adjusting signal on the basis of the conduction angle of phase-controlled AC voltage or a light adjusting signal input from the outside. The element is connected in series with at least one of the first and second series circuits and changes the voltage-current characteristic of the first or second series circuit.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a lighting device.

  A series circuit in which a plurality of light emitting elements such as LEDs (Light Emitting Diodes) that emit light of a certain color temperature are connected in series, and a series in which a plurality of light emitting elements that emit light of a color temperature different from this color temperature are connected in series There is a power supply circuit that outputs current to a circuit (series-parallel circuit) connected to the circuit in parallel.

  Here, it is desired that the voltage / current characteristics of the series circuit can be changed by an element provided in the series circuit of the light emitting elements.

JP 2014-26883 A

  The problem to be solved by the present invention is to enable voltage-current characteristics of a series circuit to be changed by an element provided in the series circuit of light-emitting elements.

  The illumination device of the embodiment includes a series-parallel circuit, a constant current circuit, and an element. The series-parallel circuit includes a first series circuit in which a plurality of first light emitting elements that emit light of a first color temperature are connected in series, and a plurality of light that emits light of a second color temperature different from the first color temperature. A circuit in which a second series circuit in which second light emitting elements are connected in series is connected in parallel. The constant current circuit converts the supplied electric power and supplies a constant current to the series-parallel circuit based on the dimming signal based on the conduction angle of the AC voltage under phase control or the dimming signal input from the outside. Supply. The element is connected in series to at least one of the first or second series circuit and changes the voltage-current characteristic of the first or second series circuit.

  According to the illuminating device of the embodiment, an effect that the voltage-current characteristics of the series circuit can be changed by an element provided in the series circuit of the light emitting elements can be expected.

FIG. 1 is a diagram illustrating an example of the configuration of the illumination device 1 according to the first embodiment. Figure 2 is a diagram for explaining an example of a V _F -I _F curve slope of the change in case of changing the value of R _F. Figure 3 is a diagram explaining one example of a change in the position of the V _F -I _F curve in the case of changing the value of V _0. (A) of FIG. 4, the _V F -I _F curve 32 of the series circuit 12b, a diagram showing an example of the relationship between _V F -I _F curve 33 of the series circuit 12d, in FIG. 4 (b) 4 is a diagram showing an example of the relationship between the constant current I ₀ and the color temperature of light output from the illumination load 12 in the case of the example of FIG. 4A, and FIG. 4C is a diagram of FIG. is a diagram showing an example of the relationship between the constant current I ₀ and the illuminance of the light output from the lighting load 12 in the example of (a). (A) in FIG. 5, a _V F -I _F curve 32 of the series circuit 12b, a diagram showing an example of the relationship between _V F -I _F curve 33 of the series circuit 12d, in FIG. 5 (b) FIG. 5 is a diagram showing an example of the relationship between the constant current I ₀ and the color temperature of the light output from the illumination load 12 in the case of the example of FIG. 5 (a), and FIG. is a diagram showing an example of the relationship between the constant current I ₀ and the illuminance of the light output from the lighting load 12 in the example of (a). FIG. 6 is a diagram illustrating an example of the configuration of the power supply circuit 10. FIG. 7 is a diagram illustrating an example of the configuration of the power supply circuit 10e. FIG. 8 is a diagram illustrating an example of the configuration of the illumination device 2 according to the second embodiment. FIG. 9 is a diagram illustrating an example of the configuration of the illumination device 3 according to the third embodiment. FIG. 10 is a diagram illustrating an example of the configuration of the illumination device 4 according to the fourth embodiment. FIG. 11 is a diagram illustrating an example of the configuration of the illumination device 5 according to the fifth embodiment. FIG. 12 is a diagram illustrating an example of the configuration of the illumination device 6 according to the sixth embodiment. FIG. 13 is a diagram illustrating an example of the configuration of the illumination device 7 according to the seventh embodiment. FIG. 14 is a diagram illustrating an example of the configuration of the illumination device 8 according to the eighth embodiment. FIG. 15 is a diagram illustrating an example of the configuration of the illumination device 9 according to the ninth embodiment. FIG. 16 is a diagram illustrating an example of the configuration of the illumination device 70 according to the tenth embodiment. FIG. 17 is a diagram illustrating an example of the configuration of the illumination device 71 according to the eleventh embodiment. FIG. 18 is a diagram illustrating an example of the configuration of the illumination device 72 according to the twelfth embodiment.

  The illumination device of the embodiment described below includes a series-parallel circuit, a constant current circuit, and an element. The series-parallel circuit includes a first series circuit in which a plurality of first light emitting elements that emit light of a first color temperature are connected in series, and a plurality of light that emits light of a second color temperature different from the first color temperature. A circuit in which a second series circuit in which second light emitting elements are connected in series is connected in parallel. The constant current circuit converts the supplied electric power and supplies a constant current to the series-parallel circuit based on the dimming signal based on the conduction angle of the AC voltage under phase control or the dimming signal input from the outside. Supply. The element is connected in series to at least one of the first or second series circuit and changes the voltage-current characteristic of the first or second series circuit.

  Moreover, in the illuminating device which concerns on embodiment described below, an element is a variable resistance.

  Moreover, in the illuminating device which concerns on embodiment described below, an element is a current drive element.

  In the illumination device according to the embodiment described below, the current driving element is a transistor having a collector connected to at least one of the first or second series-parallel circuit.

  Moreover, in the illuminating device which concerns on embodiment described below, an element is a voltage drive element.

  In the illumination device according to the embodiment described below, the voltage driving element is a field effect transistor (FET) having a drain connected in series to at least one of the first or second series-parallel circuit.

  Each embodiment will be described below with reference to the drawings. In each embodiment, the same parts are denoted by the same reference numerals, and redundant description is omitted.

(First embodiment)
FIG. 1 is a diagram illustrating an example of the configuration of the illumination device 1 according to the first embodiment. As illustrated in the example of FIG. 1, the lighting device 1 includes a power supply circuit 10 and a lighting load 12.

  The power supply circuit 10 is connected to the phase dimmer 91. Moreover, the power supply circuit 10 is connected with the illumination load 12 via the contacts 11a and 11b. The phase dimmer 91 is connected to a commercial AC power supply 90 that is an external power supply. The phase dimmer 91 has a dimming volume (not shown) that is operated by the user, and is supplied from the commercial AC power supply 90 at a conduction angle corresponding to the dimming rate specified by the dimming volume. The phase of the voltage is controlled, and the AC voltage subjected to phase control is supplied to the power supply circuit 10. The phase dimmer 91 is connected to the anodes of the diode 92a and the diode 92b as rectifier elements. Here, the cathodes of the diode 92 a and the diode 92 b are connected to the dimming control circuit 93. The phase dimmer 91 also supplies the phase-controlled AC voltage to the dimming control circuit 93 via the diode 92a and the diode 92b. The dimming signal input to the dimming control circuit 93 of the power supply circuit 10 is not limited to phase control, and may be a four-wire dimming method.

  The dimming control circuit 93 according to the present embodiment detects the conduction angle from the phase-controlled AC voltage using a known technique. Then, the dimming control circuit 93 notifies the detected conduction angle to a constant current circuit 10 d described later of the power supply circuit 10.

  When the phase-controlled AC voltage is supplied, the power supply circuit 10 converts the supplied AC voltage into a DC voltage. In the power supply circuit 10, a constant current circuit 10 d to be described later that operates by this DC voltage passes a constant current having a current value based on the conduction angle of the phase-controlled AC voltage to the illumination load 12. In this way, the power supply circuit 10 controls the illumination load 12 so as to emit light with illuminance based on the conduction angle.

  The illumination load 12 emits orange light, for example, a series circuit 12b in which a plurality of light emitting elements 12a emitting light having a color temperature of about 2000K is connected in series, and white light, for example, light having a color temperature of about 6500K. It includes a circuit (series-parallel circuit) 12e in which a series circuit 12d in which a plurality of light emitting elements 12c that emit light are connected in series is connected in parallel.

When a constant current I ₀ having a current value based on the conduction angle of the phase-controlled AC voltage is caused to flow through the series-parallel circuit 12e of the lighting load 12 by the constant current circuit 10d described later, each of the series circuit 12b and the series circuit 12d. , the current corresponding to V _F -I _F characteristics of the respective series circuits (voltage-current characteristics).

The voltage-current characteristic of the series circuit is expressed by the following equation.
V _F = V ₀ + R _F × _IF

The value of V _F increases, the series circuit having the voltage-current characteristic, a large current flows. Furthermore, _V F -I _F characteristic curve _(V F -I _F curve) showing the voltage-current characteristic, the _{V F} and the horizontal axis, when expressed in the graph to the longitudinal axis _{I F} is the _{R F} value As the value of R increases, the inclination decreases. As the value of R _F decreases, the inclination increases. Furthermore, V _F -I _F curve, the larger the value of V ₀ is, its position is moved in the direction value on the horizontal axis increases, as the value of V ₀ is smaller, the position is, the horizontal axis values Moves in the direction of decreasing.

Figure 2 is a diagram for explaining an example of a V _F -I _F curve slope of the change in case of changing the value of R _F. For example, when increasing the value of _{R F} is, _V F -I _F curves 30 located in the position P1 is to move to the position _P2, the slope of V F -I _F curve 30 is reduced. Further, when the smaller value of _{R F} is, _V F -I _F curve 30 located at position P2 is to move to the position _P1, the slope of V F -I _F curve 30 increases.

Figure 3 is a diagram explaining one example of a change in the position of the V _F -I _F curve in the case of changing the value of V _0. For example, when increasing the value of _{V 0,} as is _V F -I _F curve 31 located at the position P3 is moved to the position _P4, the position of the V F -I _F curve 31 has a larger value of the horizontal axis Move in the direction. Further, when the reduced value of _{V 0,} as is _V F -I _F curve 31 located at the position P4 is moved to the position _P3, the position of the V F -I _F curve 31 is small the value of the horizontal axis Move in the direction.

In this way, by changing the value of such R _F, it is possible to change and slope of the V _F -I _F curve, for example, after the implementation of a series-parallel circuit 12e, or the production of series-parallel circuit 12e It is convenient if the voltage-current characteristics of a series circuit such as the series circuit 12b can be changed later.

  Therefore, in this embodiment, as shown in FIG. 1, the variable resistor 13 is connected in series to the series circuit 12b. Thereby, the user can change the resistance value of the variable resistor 13 even after the serial-parallel circuit 12e is manufactured. In the inspection process at the factory, the resistance value of the variable resistor 13 can be changed and adjusted even after the series-parallel circuit 12e is mounted.

Here, when the user increases the resistance value of the variable resistor 13, the value of R _F increases. Therefore, when the user increases the resistance value of the variable resistor 13, the slope of V _F -I _F curve of the series circuit 12b is reduced. Also, if the user has a small resistance value of the variable resistor 13, the value of R _F is reduced. Therefore, when the user has a small resistance value of the variable resistor 13, the slope of V _F -I _F curve of the series circuit 12b is large. Therefore, if you want to increase the slope of the V _F -I _F curve, the user may reduce the resistance value of the variable resistor 13. When it is desired to reduce the inclination of the V _F -I _F curve, the user may increase the resistance value of the variable resistor 13.

For example, as shown in the example of FIG. 4 (a), when the _V F -I _F curve 32 of the series circuit 12b, a _V F -I _F curve 33 of the series circuit 12d is related not intersect, Even when the power supply circuit 10 changes the current value of the constant current and performs dimming of the series circuit 12b and the series circuit 12d, the color of the light output from the illumination load 12 does not change much. However, when the user increases the resistance value of the variable resistor 13, as shown in the example of FIG. 5 (a), the slope of _V F -I _F curve 32 of the series circuit 12b becomes _smaller, V F -I _F curve 32 and the V _F -I _F curve 33 come to intersect. If and the V _F -I _F curve 32 and _V F -I _F curve 33 is a relationship of intersection, the power supply circuit 10 by changing the current value of the constant current, performing the dimming of the series circuit 12b and the series circuit 12d The color of the light output from the illumination load 12 changes greatly.

FIG. 4B is a diagram illustrating an example of a relationship between the constant current I ₀ and the color temperature of light output from the illumination load 12 in the case of the example of FIG. FIG. 4C is a diagram illustrating an example of the relationship between the constant current I ₀ and the illuminance of light output from the illumination load 12 in the case of the example of FIG. As can be seen from the relationship shown is shown in FIG. 4 (b) and FIG. 4 (c), the though illuminance also increases as the constant current I ₀ is large, the color temperature is almost unchanged. Therefore, in the case of the example of FIG. 4A, the power supply circuit 10 cannot perform toning only by dimming.

FIG. 5B is a diagram illustrating an example of the relationship between the constant current I ₀ and the color temperature of light output from the illumination load 12 in the case of the example of FIG. FIG. 5C is a diagram illustrating an example of the relationship between the constant current I ₀ and the illuminance of light output from the illumination load 12 in the case of the example of FIG. As can be seen from the relationship shown in FIGS. 5B and 5C, the illuminance increases and the color temperature increases as the constant current I ₀ increases. Therefore, in the case of the example of FIG. 5A, the power supply circuit 10 can perform color adjustment only by dimming (changing the current or voltage supplied to the series circuit 12b and the series circuit 12d). Therefore, if the user of the illuminating device 1 according to the present embodiment changes the resistance value of the variable resistor 13, the user can change the power supply circuit 10 so that the color can be adjusted only by dimming.

  From the above, according to the lighting device 1 according to the present embodiment, the voltage-current characteristics of the series circuit 12b can be changed after the series-parallel circuit 12e is mounted or after the series-parallel circuit 12e is manufactured. The variable resistor 13 may be connected in series to at least one of the series circuit 12b and the series circuit 12d.

  From the above, it can be said that the variable resistor 13 is an element that changes the voltage-current characteristic of the series circuit. The variable resistor 13 is only an example of such an element.

  FIG. 6 is a diagram illustrating an example of the configuration of the power supply circuit 10. As shown in the example of FIG. 6, the power supply circuit 10 includes a DC voltage conversion unit 10a, a constant voltage circuit 10b, a smoothing capacitor 10c, and a constant current circuit 10d.

  The DC voltage conversion unit 10a converts the supplied AC voltage into a DC voltage. For example, the DC voltage conversion unit 10a has at least a rectifier circuit, and the rectifier circuit performs full-wave rectification on the supplied AC voltage and outputs it.

  The constant voltage circuit 10b includes a step-up chopper circuit or a step-down chopper circuit including a switching element, and the step-up chopper circuit or the step-down chopper circuit boosts or reduces the AC voltage full-wave rectified by the DC voltage conversion unit 10a. The voltage is stepped down to a constant piezoelectric output.

  The smoothing capacitor 10c smoothes the voltage output from the constant voltage circuit 10b and supplies a predetermined DC constant voltage to the constant current circuit 10d.

  The constant current circuit 10d is operated by a predetermined DC constant voltage output after being smoothed by the smoothing capacitor 10c. The constant current circuit 10 d passes a constant current having a current value based on the conduction angle notified from the dimming control circuit 93 to the illumination load 12.

  The lighting device 1 according to this embodiment has been described above. According to the illuminating device 1 which concerns on this embodiment, the voltage-current characteristic of the series circuit 12b can be changed after manufacture of the series-parallel circuit 12e. Further, the light source can be dimmed (by changing the current or voltage supplied to the series circuit 12b and the series circuit 12d) by one power supply circuit 10 of the lighting device 1, and the color can be adjusted.

  In addition to the power supply circuit 10 described above, other power supply circuits can be used. Therefore, another power supply circuit will be described with reference to FIG.

  FIG. 7 is a diagram illustrating an example of the configuration of the power supply circuit 10e. The power supply circuit 10e is different from the power supply circuit 10 shown in the example of FIG. 9 in that a dimming signal indicating a dimming rate is input from the dimming control circuit 94. When the dimming control circuit 94 receives a dimming signal from the outside, the dimming control circuit 94 outputs the received dimming signal to the constant current circuit 10d.

  The constant current circuit 10 d passes a constant current having a current value based on the dimming rate of the dimming signal output from the dimming control circuit 94 to the illumination load 12.

(Second Embodiment)
Next, a lighting device according to the second embodiment will be described. FIG. 8 is a diagram illustrating an example of the configuration of the illumination device 2 according to the second embodiment. The illuminating device 2 is different from the illuminating device 1 in that the illuminating device 2 includes a resistor 14, a variable DC power supply 15, and a switch 16 instead of the variable resistor 13 of the illuminating device 1 shown in FIG.

  As shown in the example of FIG. 8, one end of the resistor 14 is connected to the series circuit 12b. The other end of the resistor 14 is connected to one end of a variable DC power supply 15. The other end of the variable DC power supply 15 is connected to the contact 11b. That is, the resistor 14 and the variable DC power source 15 are connected in series with the series circuit 12b. The user can change the voltage value of the variable DC power supply 15 even after the serial-parallel circuit 12e is manufactured or after the serial-parallel circuit 12e is manufactured.

  One end of the switch 16 is connected to one end of the resistor 14. The other end of the switch 16 is connected to the contact 11b. That is, the switch 16 is connected in parallel with the resistor 14 and the variable DC power supply 15. The resistor 14, the variable DC power supply 15, and the switch 16 are examples of elements that change the voltage-current characteristics of the series circuit.

  The dimming control circuit 93 can switch the switch 16 on and off according to a user instruction. Moreover, the dimming control circuit 93 can set the voltage value of the variable DC power supply 15 according to a user instruction. That is, the user can change the voltage value of the variable DC power supply 15 even after the series-parallel circuit 12e is mounted or after the series-parallel circuit 12e is manufactured.

With the switch 16 turned off, the user can adjust the value of V ₀ of the series circuit 12 b by adjusting the voltage value of the variable DC power supply 15 through the dimming control circuit 93. For example, when the voltage value of the variable DC power supply 15 increases, the value of V ₀ of the series circuit 12b also increases. When the voltage value of the variable DC power supply 15 decreases, the value of V ₀ of the series circuit 12b decreases. Therefore, the user can change the voltage-current characteristic of the series circuit 12b by adjusting the voltage value of the variable DC power supply 15. Therefore, according to the illuminating device 2 which concerns on this embodiment, the voltage-current characteristic of the series circuit 12b can be changed after mounting the series-parallel circuit 12e or after manufacturing the series-parallel circuit 12e. Further, the light source can be dimmed (by changing the current or voltage supplied to the series circuit 12b and the series circuit 12d) by one power supply circuit 10 of the lighting device 2, and the color can be adjusted.

Also, when turning on the switch 16, out of the series circuit 12b and the series circuit 12d, a series circuit towards the value of V _F is small, a large amount of current flows. Therefore, according to the illuminating device 2 which concerns on this embodiment, the change of the color temperature at the time of light control is enlarged by adjusting the voltage value of the variable DC power supply 15, and switching the switch 16 on and off. Can do.

(Third embodiment)
Next, an illumination device according to the third embodiment will be described. FIG. 9 is a diagram illustrating an example of the configuration of the illumination device 3 according to the third embodiment. The illumination device 3 is different from the illumination device 2 in that a switch 17 is provided instead of the variable DC power supply 15 of the illumination device 2 shown in FIG.

  The dimming control circuit 93 can switch the switch 17 on and off in accordance with a user instruction.

The switch 16 is turned on, turning off the switch 17, the R _F of the series circuit 12b becomes smaller, the slope of the voltage-current characteristic of the series circuit 12b is large. On the other hand, turns off the switch 16, turning on the switch 17, the R _F of the series circuit 12b becomes larger, the slope of the voltage-current characteristic of the series circuit 12b is reduced. Therefore, according to the illuminating device 3 which concerns on this embodiment, the voltage-current characteristic of the series circuit 12b can be changed after mounting the series-parallel circuit 12e or manufacturing the series-parallel circuit 12e. Further, the light source can be dimmed by one power supply circuit 10 of the illumination device 3 (current or voltage supplied to the series circuit 12b and the series circuit 12d is changed) and color can be adjusted. The switch 17 is an example of an element that changes the voltage-current characteristic of the series circuit.

  Further, when the switch 16 and the switch 17 are turned off, light is emitted only from the light emitting element 12c of the series circuit 12d. That is, the light can be adjusted so as to be a single color. Therefore, according to the lighting device 3 according to the present embodiment, the change in the color temperature during dimming can be increased by switching the switch 16 and the switch 17 on and off.

(Fourth embodiment)
Next, the illuminating device which concerns on 4th Embodiment is demonstrated. FIG. 10 is a diagram illustrating an example of the configuration of the illumination device 4 according to the fourth embodiment. The illumination device 4 is different from the illumination device 1 in that the illumination device 4 includes a transistor 18 as a current driving element instead of the variable resistor 13 of the illumination device 1 shown in FIG.

  As shown in FIG. 10, the collector of the transistor 18 is connected to the other end of the series circuit 12 b, the emitter is connected to the contact 11 b, and the base is connected to the dimming control circuit 93. That is, the transistor 18 is connected in series with the series circuit 12b.

The dimming control circuit 93 can adjust the magnitude of the base current of the transistor 18 according to a user instruction. Note that the magnitude of the impedance between the collector and the emitter can be controlled by controlling the magnitude of the base current of the transistor 18. When this impedance increases, the R _{F of the} series circuit 12b increases, and when the impedance decreases, the R _{F of the} series circuit 12b decreases. Therefore, the user can change the voltage-current characteristic of the series circuit 12b by adjusting the magnitude of the base current of the transistor 18. Therefore, according to the illuminating device 4 which concerns on this embodiment, the voltage-current characteristic of the series circuit 12b can be changed after the series-parallel circuit 12e is mounted or after the series-parallel circuit 12e is manufactured. In addition, it is possible to perform light adjustment (by changing the current or voltage supplied to the series circuit 12b and the series circuit 12d) and toning by one power supply circuit 10 of the lighting device 4. The transistor 18 is an example of an element that changes the voltage-current characteristics of the series circuit.

(Fifth embodiment)
Next, an illuminating device according to a fifth embodiment will be described. FIG. 11 is a diagram illustrating an example of the configuration of the illumination device 5 according to the fifth embodiment. The lighting device 5 is different from the lighting device 4 shown in FIG. 10 in that the lighting device 5 has a variable DC power source 19 and a resistor 20.

  As shown in FIG. 11, the variable DC power supply 19 is connected to the base of the transistor 18 via the resistor 20.

  The dimming control circuit 93 can adjust the magnitude of the output voltage of the variable DC power supply 19 according to a user instruction. The user can control the magnitude of the base current of the transistor 18 by controlling the magnitude of the output voltage. Therefore, the user can change the voltage-current characteristic of the series circuit 12b by controlling the magnitude of the output voltage. Therefore, according to the illuminating device 5 which concerns on this embodiment, the voltage-current characteristic of the series circuit 12b can be changed after mounting the series-parallel circuit 12e or manufacturing the series-parallel circuit 12e. In addition, it is possible to perform light adjustment (by changing the current or voltage supplied to the series circuit 12b and the series circuit 12d) and toning by one power supply circuit 10 of the lighting device 5. The variable DC power source 19 and the resistor 20 are examples of elements that change the voltage-current characteristics of the series circuit.

(Sixth embodiment)
Next, an illumination device according to a sixth embodiment will be described. FIG. 12 is a diagram illustrating an example of the configuration of the illumination device 6 according to the sixth embodiment. The illuminating device 6 is different from the illuminating device 4 shown in FIG.

  As shown in FIG. 12, one end of the resistor 21 is connected to the emitter of the transistor 18. The other end of the resistor 21 is connected to the contact 11b.

  In the present embodiment, as in the fourth embodiment, the user can change the voltage-current characteristics of the series circuit 12b by adjusting the magnitude of the base current of the transistor 18. Therefore, according to the illuminating device 6 which concerns on this embodiment, the voltage-current characteristic of the series circuit 12b can be changed after mounting the series-parallel circuit 12e or manufacturing the series-parallel circuit 12e. In addition, it is possible to perform light adjustment (by changing the current or voltage supplied to the series circuit 12b and the series circuit 12d) by one power supply circuit 10 of the lighting device 6, and to perform color adjustment. The resistor 21 is an example of an element that changes the voltage-current characteristics of the series circuit.

  In the present embodiment, the transistor 18 is used as a switching element in addition to the current driving element. The dimming control circuit 93 emits light only from the light emitting element 12c of the series circuit 12d when the transistor 18 as the switching element is turned off by a user instruction. That is, the light can be adjusted so as to be a single color. Therefore, according to the lighting device 6 according to the present embodiment, the change in the color temperature during dimming can be increased by switching the transistor 18 on and off.

(Seventh embodiment)
Next, an illumination device according to a seventh embodiment will be described. FIG. 13 is a diagram illustrating an example of the configuration of the illumination device 7 according to the seventh embodiment. The illuminating device 7 is different from the illuminating device 6 shown in FIG. 12 in having a transistor 22 as a switching element.

  As shown in FIG. 13, the collector of the transistor 22 is connected to the emitter of the transistor 18 and one end of the resistor 21. Further, the emitter of the transistor 22 is connected to the contact 11 b, and the base is connected to the dimming control circuit 93.

In the present embodiment, as in the sixth embodiment, the user can change the voltage-current characteristics of the series circuit 12b by adjusting the magnitude of the base current of the transistor 18. In the present embodiment, the transistor 22 is used as a switching element. The dimming control circuit 93 can reduce the value of R _F of the series circuit 12b when the transistor 22 as a switching element is turned on by a user instruction. Therefore, according to the illuminating device 7 which concerns on this embodiment, the voltage-current characteristic of the series circuit 12b can be changed after mounting the series-parallel circuit 12e or manufacturing the series-parallel circuit 12e. Further, the light source can be dimmed (a current or voltage supplied to the series circuit 12b and the series circuit 12d is changed) by one power supply circuit 10 of the lighting device 7, and color can be adjusted. The transistor 22 is an example of an element that changes the voltage-current characteristics of the series circuit.

  In the present embodiment, as in the sixth embodiment, the change in color temperature during dimming can be increased by switching the transistor 18 on and off.

(Eighth embodiment)
Next, an illuminating device according to an eighth embodiment will be described. FIG. 14 is a diagram illustrating an example of the configuration of the illumination device 8 according to the eighth embodiment. The illuminating device 8 is different from the illuminating device 4 in that, instead of the transistor 18 of the illuminating device 4 shown in FIG.

  As shown in FIG. 14, the drain of the FET 23 is connected to the other end of the series circuit 12 b, the source is connected to the contact 11 b, and the gate is connected to the dimming control circuit 93. That is, the FET 23 is connected in series with the series circuit 12b.

The dimming control circuit 93 can adjust the magnitude of the voltage applied to the gate of the FET 23 according to a user instruction. Note that the magnitude of the impedance between the drain and source can be controlled by controlling the magnitude of the voltage applied to the gate of the FET 23. When this impedance increases, the R _{F of the} series circuit 12b increases, and when the impedance decreases, the R _{F of the} series circuit 12b decreases. Therefore, the user can change the voltage-current characteristic of the series circuit 12b by adjusting the magnitude of the voltage applied to the gate of the FET 23. Therefore, according to the illuminating device 8 which concerns on this embodiment, the voltage-current characteristic of the series circuit 12b can be changed after the series-parallel circuit 12e is mounted or after the series-parallel circuit 12e is manufactured. In addition, it is possible to perform light adjustment (by changing the current or voltage supplied to the series circuit 12b and the series circuit 12d) by one power supply circuit 10 of the lighting device 8 and to perform color adjustment. The FET 23 is an example of an element that changes the voltage-current characteristics of the series circuit.

  The FET 23 can also be used as a switching element. For example, when the dimming control circuit 93 turns off the FET 23 as a switching element in accordance with a user instruction, light is emitted only from the light emitting element 12c of the series circuit 12d. That is, the light can be adjusted so as to be a single color. Therefore, according to the illuminating device 8 according to the present embodiment, the change in the color temperature during dimming can be increased by switching the FET 23 on and off.

(Ninth embodiment)
Next, an illumination device according to a ninth embodiment will be described. FIG. 15 is a diagram illustrating an example of the configuration of the illumination device 9 according to the ninth embodiment. The illumination device 9 is different from the illumination device 8 shown in FIG.

  As shown in FIG. 15, one end of the resistor 24 is connected to the source of the FET 23. The other end of the resistor 24 is connected to the contact 11b.

  In the present embodiment, as in the eighth embodiment, the user can change the voltage-current characteristics of the series circuit 12 b by adjusting the magnitude of the voltage applied to the gate of the FET 23. Therefore, according to the lighting device 9 according to the present embodiment, the voltage-current characteristics of the series circuit 12b can be changed after the series-parallel circuit 12e is mounted or after the series-parallel circuit 12e is manufactured. Further, the light source can be dimmed by one power supply circuit 10 of the lighting device 9 (current or voltage supplied to the series circuit 12b and the series circuit 12d is changed) and color can be adjusted. The resistor 24 is an example of an element that changes the voltage-current characteristics of the series circuit.

  In the present embodiment, when the transistor 18 is used as a switching element, the change in color temperature during dimming is increased by switching the FET 23 on and off, as in the eighth embodiment. Can do.

(Tenth embodiment)
Next, a lighting device according to a tenth embodiment will be described. FIG. 16 is a diagram illustrating an example of the configuration of the illumination device 70 according to the tenth embodiment. The illumination device 70 is different from the illumination device 9 shown in FIG. 15 in that the illumination device 70 includes an FET 25 as a switching element.

  As shown in FIG. 16, the drain of the FET 25 is connected to the source of the FET 23 and one end of the resistor 24. In addition, the source of the FET 25 is connected to the contact 11 b and the gate is connected to the dimming control circuit 93.

In the present embodiment, as in the ninth embodiment, the user can change the voltage-current characteristics of the series circuit 12b by adjusting the magnitude of the voltage applied to the gate of the FET 23. In the present embodiment, the FET 25 is used as a switching element. The dimming control circuit 93 can reduce the value of R _F of the series circuit 12b by turning on the FET 25 as a switching element according to a user instruction. Therefore, according to the lighting device 70 according to the present embodiment, the voltage-current characteristics of the series circuit 12b can be changed after the series-parallel circuit 12e is mounted or after the series-parallel circuit 12e is manufactured. Further, the light source can be dimmed by one power supply circuit 10 of the lighting device 70 (current or voltage supplied to the series circuit 12b and the series circuit 12d is changed) and color can be adjusted. The FET 25 is an example of an element that changes the voltage-current characteristics of the series circuit.

  In the present embodiment, as in the ninth embodiment, the change in color temperature during dimming can be increased by switching the FET 23 on and off.

  In addition, it can also manufacture at the time of manufacture so that the voltage current characteristic of the series circuit 12b and the voltage current characteristic of the series circuit 12d may become a desired voltage current characteristic. Therefore, a lighting device in which these two voltage-current characteristics are desired voltage-current characteristics at the time of manufacture will be described with reference to FIGS. 17 and 18.

(Eleventh embodiment)
Next, a lighting device according to an eleventh embodiment will be described. FIG. 17 is a diagram illustrating an example of the configuration of the illumination device 71 according to the eleventh embodiment. The lighting device 71 is different from the lighting device 1 shown in FIG. 1 in that the variable resistor 13 is not provided.

In the lighting device 71 according to the present embodiment, at the time of manufacture, the type and number of the light emitting elements 12a and the number of the light emitting elements 12c so that the voltage current characteristics of the series circuit 12b and the voltage current characteristics of the series circuit 12d have desired voltage current characteristics. The type and number are determined. For example, the type and number of the light emitting elements 12a and the type and number of the light emitting elements 12c are determined so that V ₀ and R _F have desired values. Then, the series circuit 12b is manufactured by connecting the determined type and number of light emitting elements 12a in series, and the series circuit 12d is manufactured by connecting the determined type and number of light emitting elements 12c in series. Therefore, according to the illuminating device 71 which concerns on this embodiment, it can have a desired voltage-current characteristic. Further, the light source 71 of the lighting device 71 can be dimmed (the current or voltage supplied to the series circuit 12b and the series circuit 12d is changed) and the color can be adjusted.

(Twelfth embodiment)
Next, a lighting device according to a twelfth embodiment will be described. FIG. 18 is a diagram illustrating an example of the configuration of the illumination device 72 according to the twelfth embodiment. The lighting device 72 is different from the lighting device 71 shown in FIG.

  As shown in FIG. 18, one end of the resistor 26 is connected to the other end of the series circuit 12b. The other end of the resistor 26 is connected to the contact 11b.

In the lighting device 72 according to the present embodiment, the type and number of the light emitting elements 12a and the number of the light emitting elements 12c are set so that the voltage current characteristics of the series circuit 12b and the voltage current characteristics of the series circuit 12d become desired voltage current characteristics at the time of manufacture. The type and number, and the resistance 26 are determined. For example, the type and number of the light emitting elements 12a, the type and number of the light emitting elements 12c, and the resistor 26 are determined so that V ₀ and R _F have desired values. The series circuit 12b is manufactured by connecting the light emitting elements 12a of the determined type and number in series with the resistor 26, and the series circuit 12d is manufactured by connecting the light emitting elements 12c of the determined type and number in series. Is done. Therefore, according to the illuminating device 72 which concerns on this embodiment, it can have a desired voltage current characteristic. Further, the light source can be dimmed by one power supply circuit 10 of the lighting device 72 (current or voltage supplied to the series circuit 12b and the series circuit 12d is changed) and color can be adjusted.

  The first to twelfth embodiments have been described above. According to the first to tenth embodiments, the voltage / current characteristics of the series circuit can be changed by the elements provided in the series circuit of the light emitting elements. In the second to twelfth embodiments, the power supply circuit 10e shown in FIG. 7 can be used instead of the power supply circuit 10 as in the first embodiment.

  Further, in the second to twelfth embodiments, as in the first embodiment, the elements that change the voltage-current characteristics of the series circuit are the same as those of the first series circuit 12b and the second series circuit 12d. It may be connected in series to at least one of the series circuits.

Although several embodiments and examples of the present invention have been described, these embodiments or examples are presented as examples and are not intended to limit the scope of the invention. These novel embodiments or examples can be implemented in various other forms,
Various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments or examples and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Illuminating device 12e Series parallel circuit 13 Variable resistance

Claims (6)

A first series circuit in which a plurality of first light emitting elements that emit light of a first color temperature are connected in series and a plurality of second light emission that emits light of a second color temperature different from the first color temperature. A series-parallel circuit in which a second series circuit having elements connected in series is connected in parallel;
A constant current that converts the supplied power and supplies a constant current to the series-parallel circuit based on a dimming signal based on a conduction angle of a phase-controlled AC voltage or a dimming signal input from the outside. Current circuit;
An element connected in series to at least one of the first or second series circuit and changing a voltage-current characteristic of the first or second series circuit;
An illumination device comprising:   The lighting device according to claim 1, wherein the element is a variable resistor.   The lighting device according to claim 1, wherein the element is a current driving element.   The lighting device according to claim 3, wherein the current driving element is a transistor having a collector connected in series to at least one of the first or second series circuit.   The lighting device according to claim 1, wherein the element is a voltage driving element.   6. The lighting device according to claim 5, wherein the voltage driving element is a field effect transistor (FET) having a drain connected in series to at least one of the first or second series circuit.

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