JP2016170969A - Lighting circuit, luminaire and illumination set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting circuit capable of adjusting an output to a solid light emission element module with high precision by a simplified circuit configuration.SOLUTION: A lighting circuit 1 for outputting current to a solid light emission element module (LED module 2) includes a power supply unit 11 for outputting current to the LED module 2, a characteristic adjustment unit 14 for outputting an adjustment signal which is a signal for adjusting the light emission characteristic of the LED module 2 and corresponds to a target value of output current of the power supply unit 11, and an output adjustment unit 12 for adjusting the output current of the power supply unit 11 according to the adjustment signal output from the characteristic adjustment unit 14. The characteristic adjustment unit 14 has variable resistance elements 141 and 142 which are different in maximum resistance value, minimum resistance value or resistance value variable range, and outputs, to the output adjustment unit 12, an adjustment signal which is generated in conformity with a composite resistance value defined by the series connection of variable resistance elements 141 and 142.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a lighting circuit that supplies current to a solid-state light-emitting element module including a solid-state light-emitting element such as an LED (Light Emitting Diode), a lighting fixture including the same, and a lighting set.

  A lighting circuit that supplies current to a solid-state light emitting element such as an LED is known (for example, Patent Document 1). The illumination device disclosed in Patent Document 1 discloses a configuration that prevents fluctuations in the output current value to the LED in each of the fully lit state and the dimming lower limit.

  FIG. 8 is a block circuit diagram showing a schematic configuration of the illumination device described in Patent Document 1. As shown in FIG. As shown in FIG. 8, the lighting device 500 includes a back converter 510, a power supply circuit 621, a dimming control circuit 622, a fully lighting variable resistance element 623a, a dimming lower limit variable resistance element 623b, and an all lighting resistance switching element 624a. , A dimming lower limit resistance switching element 624b, a power factor correction circuit 625, an LED 526, and a dimming signal resistance element 627. In the above configuration, when the dimming signal level is high, the all-lighting resistance switching element 624a is turned on and the all-lighting variable resistance element 623a is operated to adjust the current supplied to the LED 526. On the other hand, when the dimming signal level is low, the dimming lower limit resistance switching element 624b is turned on and the dimming lower limit variable resistance element 623b is operated to adjust the supply current to the LED 526. Thereby, the lighting stability from the fully lit state to the dimming lower limit is improved.

JP 2013-125616 A

  However, in the case of the lighting device described in Patent Document 1, since the output is adjusted by operating one variable resistance element in each of the fully lit state and the dimming lower limit state, the supply current can only be linear. Cannot adjust. Since the light emission characteristics of LEDs vary widely, such as light distribution, chromaticity, and color rendering, high-precision current output adjustment including nonlinear adjustment is required. On the other hand, it is assumed that the dimming signal is adjusted with high accuracy using a digital IC or the like. However, a DA converter, a memory, and the like are required, and the processing circuit becomes complicated and expensive.

  The present invention has been made to solve such problems, and provides a lighting circuit, a lighting fixture, and a lighting set that can adjust the output to the solid state light emitting element module with high accuracy with a simplified circuit configuration. The purpose is to do.

  In order to achieve the above object, one aspect of a lighting circuit according to the present invention is a power supply unit that outputs a current to a solid state light emitting element module, and a signal for adjusting the light emission characteristics of the solid state light emitting element module, A characteristic adjustment unit that outputs an adjustment signal corresponding to a target value of the output current of the power supply unit; and an output adjustment unit that adjusts the output current of the power supply unit according to the adjustment signal output from the characteristic adjustment unit. The characteristic adjustment unit includes a plurality of variable resistance elements having different maximum resistance values, minimum resistance values, or variable resistance value ranges, and is generated corresponding to a combined resistance value defined by connection of the plurality of variable resistance elements. The adjusted signal is output to the output adjusting unit.

  ADVANTAGE OF THE INVENTION According to this invention, the lighting circuit, lighting fixture, and illumination set which can adjust the output to a solid light emitting element module with high precision by the simplified circuit structure can be provided.

2 is a schematic circuit diagram of a lighting circuit and an LED module according to Embodiment 1. FIG. 4 is a circuit diagram showing a specific configuration of a lighting circuit according to Embodiment 1. FIG. FIG. 7 is a circuit diagram showing a specific configuration of a lighting circuit according to Modification 1 of Embodiment 1. 6 is a diagram illustrating a configuration example of a variable resistance element according to a first modification of the first embodiment. FIG. It is a figure which shows the structural example of the variable resistance element which concerns on the modification 2 of Embodiment 1. FIG. It is an external appearance perspective view of the illumination set which concerns on Embodiment 2. FIG. It is an external appearance perspective view of the illumination set which concerns on the modification 1 of Embodiment 2. FIG. It is an external appearance perspective view of the illumination set which concerns on the modification 2 of Embodiment 2. FIG. It is a block circuit diagram which shows schematic structure of the illuminating device described in patent document 1. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Accordingly, the numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps (steps), order of steps, and the like shown in the following embodiments are merely examples and are intended to limit the present invention. is not. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a schematic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

(Embodiment 1)
[1-1. Configuration of lighting circuit and LED module]
First, configurations of the lighting circuit and the LED module according to Embodiment 1 will be described with reference to the drawings.

  FIG. 1 is a schematic circuit diagram of a lighting circuit 1 and an LED module 2 according to the first embodiment.

  The LED module 2 is a light source unit that emits illumination light when supplied with current from the lighting circuit 1, and includes an LED 21. The LED 21 is a solid light emitting element used as a light source of the LED module 2. The LED 21 is configured by, for example, a surface mount device (SMD) type LED element.

  The lighting circuit 1 is a circuit that supplies current to the LED module 2, and includes a power supply unit 11, an output adjustment unit 12, a control power supply 13, and a characteristic adjustment unit 14.

  The power supply unit 11 is a circuit that supplies a constant direct current to the LED module 2.

  The output adjustment unit 12 is a circuit that detects the output current of the power supply unit 11 and adjusts the output current of the power supply unit 11 based on the detected output current and the adjustment signal output from the characteristic adjustment unit 14.

  The control power supply 13 is a circuit that applies a constant voltage to the characteristic adjustment unit 14.

  The characteristic adjustment unit 14 is a circuit that receives an external input for adjusting the light emission characteristic of the LED module 2 and outputs an adjustment signal corresponding to the external input to the output adjustment unit 12. Specifically, the characteristic adjustment unit 14 includes variable resistance elements 141 and 142 having different maximum resistance values, minimum resistance values, or variable resistance value ranges, and a combined resistance value defined by connection between the variable resistance elements 141 and 142. The adjustment signal generated corresponding to the above is output to the output adjustment unit 12.

  With the configuration of the characteristic adjustment unit 14 including the variable resistance elements 141 and 142, an adjustment signal corresponding to the target value of the output current of the power supply unit 11 can be set with high accuracy. Therefore, the dimming level can be adjusted with high accuracy by the simplified circuit configuration of the lighting circuit 1.

[1-2. Specific configuration of lighting circuit]
FIG. 2 is a circuit diagram showing a specific configuration of the lighting circuit 1 according to the first embodiment. FIG. 2 also shows an AC power supply 3 and an LED module 2 that supply power to the lighting circuit 1 together with the lighting circuit 1.

  The AC power source 3 is a power source that outputs an AC voltage, and is a system power source such as a commercial power source that outputs an AC voltage of 100 V to 242 V, for example.

  As shown in FIG. 2, the lighting circuit 1 includes a power supply unit 11, an output adjustment unit 12, a control power supply 13, and a characteristic adjustment unit 14. The lighting circuit 1 includes output terminals 101 and 103.

  The output terminals 101 and 102 are terminals that are electrically connected to the connection terminals 221 and 223 of the LED module 2 and output current to the LED module 2, respectively.

  The power supply unit 11 is a circuit that supplies a constant direct current to the LED module 2. In the present embodiment, the power supply unit 11 converts the AC voltage input from the AC power supply 3 into a DC voltage, and further performs DC / DC conversion to generate a constant DC current. As shown in FIG. 2, the power supply unit 11 includes a rectifying unit 111, capacitors 112 and 116, a switching element 113, a diode 114, an inductor 115, and a resistance element 117.

  The rectifying unit 111 is a circuit that rectifies an AC voltage input from the AC power supply 3. The rectifying unit 111 is configured by a diode bridge, for example.

  The capacitor 112 is connected to the output terminal of the rectification unit 111 and is an element for smoothing the pulsation of the DC voltage output from the rectification unit 111. In addition, a series circuit including a switching element 113 and a diode 114 is connected to both ends of the capacitor 112. In the present embodiment, capacitor 112 is formed of an electrolytic capacitor.

  The switching element 113 is an element that switches (repetitively turns on and off) under the control of the output adjustment unit 12. In the present embodiment, an N-channel MOSFET (Metal− connected in series with the inductor 115). Oxide Semiconductor Field-Effect Transistor).

  The diode 114 is a rectifier that forms a circuit loop together with the LED 21 and the inductor 115 in the LED module 2 and regenerates energy stored in the inductor 115. The cathode terminal of the diode 114 is connected to the connection point between the switching element 113 and the inductor 115, and the anode terminal is connected to the output terminal on the low potential side of the rectifying unit 111. A series circuit including an inductor 115 and a capacitor 116 is connected to both ends of the diode 114.

  The inductor 115 is a choke coil, and stores and discharges energy according to switching of the switching element 113.

  The capacitor 116 is an element that is connected in parallel with the LED 21 and smoothes the pulsating voltage generated by the inductor 115 or the like. In the present embodiment, capacitor 116 is formed of an electrolytic capacitor.

  The resistance element 117 is connected in series with the LED 21, and is a sense resistor for detecting a current flowing through the LED 21, that is, an output current of the power supply unit 11.

  The output adjustment unit 12 detects the output current of the power supply unit 11 by detecting the voltage applied to the resistance element 117 of the power supply unit 11 and feeds back the output current of the power supply unit 11 based on the detected output current. It is a circuit to control. Further, the output adjustment unit 12 adjusts the output current of the power supply unit 11 based on the adjustment signal output from the characteristic adjustment unit 14. As shown in FIG. 2, the output adjustment unit 12 includes a drive circuit 121 and a comparator 122.

  The drive circuit 121 is a circuit that controls the switching element 113 to repeatedly turn on and off (switch). Under the control of the drive circuit 121, the output current of the power supply unit 11 is maintained substantially constant.

  The comparator 122 is a circuit that compares the voltage corresponding to the output current of the power supply unit 11 and the voltage corresponding to the target value of the output current output from the characteristic adjustment unit 14. A voltage applied to the resistance element 117 of the power supply unit 11 is input to the inverting input terminal of the comparator 122. The voltage corresponding to the target value of the output current of the power supply unit 11 generated by the characteristic adjusting unit 14 is input to the non-inverting input terminal of the comparator 122. The output of the comparator 122 is input to the drive circuit 121.

The control power supply 13 is a circuit that applies a constant voltage _Vcc to the characteristic adjustment unit 14. As shown in FIG. 2, the control power supply 13 includes a resistance element 131 and a Zener diode 132.

  The resistance element 131 is an element for limiting the current flowing through the Zener diode 132.

  The Zener diode 132 is an element for stabilizing the voltage applied to the characteristic adjustment unit 14. The voltage applied to both ends of the Zener diode 132 is, for example, about 15V.

  The characteristic adjustment unit 14 is a circuit that receives an external input for adjusting the current supplied from the lighting circuit 1 to the LED module 2 and outputs an adjustment signal based on the external input to the output adjustment unit 12. Here, the external input is, for example, an input representing a target value of the output current of the power supply unit 11, and the adjustment signal corresponds to a voltage corresponding to the target value of the output current of the power supply unit 11. As shown in FIG. 2, the characteristic adjustment unit 14 includes variable resistance elements 141 and 142, a diode 143, a resistance element 144, and a capacitor 145.

  The diode 143 is a rectifying element for preventing a current from flowing toward the control power supply 13.

Variable resistance elements 141 and 142 and resistance element 144 are elements for dividing a voltage applied from control power supply 13. The variable resistance element 141 and the variable resistance element 142 are connected in series between the connection point of the resistance element 144 and the capacitor 145 and the ground terminal. A connection point between the variable resistance element 141 and the resistance element 144 is connected to a non-inverting input terminal of the comparator 122 of the output adjustment unit 12. Thus, in the connection point, the voltage V _in corresponding to the target value of the output current of the power supply unit 11 is applied.

Capacitor 145 is a device for suppressing noise which is applied to the voltage V _in is an adjustment signal.

By characteristic adjusting section 14 is configured as described above, the voltage V _in is an adjustment signal is represented by Equation 1 below.
V _in = V _cc × (R ₁₄₁ + R ₁₄₂ ) / (R ₁₄₁ + R ₁₄₂ + R ₁₄₄ ) (Formula 1)

In other words, characteristic adjusting section 14, the voltage _{V in} is an adjustment signal corresponding to the series-connected is the sum of the resistance value of the variable resistance element 141 and 142 combined resistance value _{R 14V (= R 141 + R} 142), an output Output to the adjustment unit 12.

The above circuit configuration, the lighting circuit 1, by outputting the voltage V _in is an adjustment signal based on an external input from the characteristic adjusting unit 14 to output adjustment unit 12, a voltage the voltage corresponding to the output current of the power supply unit 11 as substantially equal to the V _in, a feedback control.

Here, in the lighting circuit 1 according to the present embodiment, the variable resistance element 141 and the variable resistance element 142 are connected in series, and the maximum resistance value, the minimum resistance value, or the resistance value variable range is different. Is an adjustment signal voltage _{V in,} by being set by the combined resistance value _{R 14 V} of the variable resistive element 141 and 142, for example as compared with the case of setting the voltage _{V in} by one variable resistance element, the voltage _{V in} Setting resolution is improved. That is, since the target value of the output current of the power supply unit 11 can be set with high accuracy, the light control level can be finely adjusted. Moreover, since it can respond to the wide specification change of the LED module 2 by changing the said synthetic | combination resistance value, the opportunity which must replace the lighting circuit itself and respond to the said specification change can be reduced. Moreover, since the lighting circuit 1 can respond to the output specifications of various types of LED modules 2, the mass production cost of the lighting circuit can be reduced.

In the above configuration, the variable resistance elements 141 and 142 are exemplified by potentiometers having a trimmer adjustment unit. By external input manipulates independently each trimmer adjustment of the variable resistance element 141 and 142, not only a linear adjustment of the voltage V _in, the light distribution, complexed chromaticity, and color rendering properties and LED Non-linear adjustment corresponding to the light emission characteristics can be achieved.

Note that the variable resistance element 142 may have a maximum resistance value that is 1/10 or less of the maximum resistance value of the variable resistance element 141. As a result, the combined resistance value of the variable resistance elements 141 and 142 can be roughly adjusted by adjusting the resistance of the variable resistance element 141 and finely adjusted by adjusting the resistance of the variable resistance element 142. In other words, it is possible to adjust the combined resistance value at high accuracy, it is possible to set the voltage V _in a precise adjustment signal.

In this embodiment, the variable resistance elements 141 and 142 are connected in series. However, the variable resistance elements 141 and 142 are connected in parallel to each other between the connection point of the resistance element 144 and the capacitor 145 and the ground terminal. Also good. Thus, for example, as compared with the case of setting the voltage V _in by one variable resistive element is improved setting resolution of the voltage V _in.

In the case where the variable resistance elements 141 and 142 are connected in parallel, the variable resistance element 142 may have a maximum resistance value that is 1/10 or less of the maximum resistance value of the variable resistance element 141. In this case, the combined resistance value of the variable resistance elements 141 and 142 can be roughly adjusted by adjusting the resistance of the variable resistance element 142 and finely adjusted by adjusting the resistance of the variable resistance element 141. In other words, it is possible to adjust the combined resistance value at high accuracy, it is possible to set the voltage V _in a precise adjustment signal.

  In the present embodiment, the characteristic adjusting unit 14 has two variable resistance elements, but may be three or more. As the number of variable resistance elements included in the characteristic adjustment unit 14 is larger, the dimming level can be adjusted with higher accuracy.

Further, in a configuration in which n (n is a natural number of 3 or more) variable resistance elements are connected in series, for example, the first variable resistance element, the second variable resistance element,. Suppose that it is a variable resistance element. In this case, the maximum resistance value of the kth variable resistance element (k is a natural number of 1 to (n−1)) may be 10 times or more the maximum resistance value of the (k + 1) th variable resistance element. According to this, the combined resistance value can be set at about n-digit precision, it is possible to set the voltage V _in the high accuracy in accordance with the number of the variable resistive element.

In a configuration in which n (n is a natural number of 3 or more) variable resistance elements are connected in parallel, for example, the first variable resistance element, the second variable resistance element,. Suppose that it is a variable resistance element. In this case, the maximum resistance value of the kth variable resistance element (k is a natural number of 1 to (n−1)) may be 10 times or more the maximum resistance value of the (k + 1) th variable resistance element. According to this, the combined resistance value can be set at about n-digit precision, it is possible to set the voltage V _in the high accuracy in accordance with the number of the variable resistive element.

[1-3. Modification of lighting circuit]
Next, a lighting circuit according to Modification 1 of Embodiment 1 will be described. In the lighting circuit 1A according to the present modification, the configuration of a plurality of variable resistance elements is different from the lighting circuit 1 according to the above-described embodiment. Hereinafter, the lighting circuit 1A according to the present modification will be described with a focus on the configuration different from the lighting circuit 1, and the description of the common configuration will be omitted.

  FIG. 3 is a circuit diagram showing a specific configuration of lighting circuit 1A according to Modification 1 of Embodiment 1. In FIG. FIG. 3 also shows the AC power supply 3 and the LED module 2 that supply power to the lighting circuit 1A together with the lighting circuit 1A.

  As illustrated in FIG. 3, the lighting circuit 1 </ b> A includes a power supply unit 11, an output adjustment unit 12, a control power supply 13, and a characteristic adjustment unit 15.

  The characteristic adjustment unit 15 is a circuit that receives an external input for adjusting an output current from the lighting circuit 1 </ b> A to the LED module 2 and outputs an adjustment signal based on the external input to the output adjustment unit 12. Here, the external input is, for example, an input representing a target value of the output current of the power supply unit 11, and the adjustment signal corresponds to a voltage corresponding to the target value of the output current of the power supply unit 11. As shown in FIG. 3, the characteristic adjustment unit 15 includes variable resistance elements 151 and 152, a diode 143, a resistance element 144, and a capacitor 145.

The variable resistance elements 151 and 152 and the resistance element 144 are elements for dividing the voltage applied from the control power supply 13. The variable resistance element 151 and the variable resistance element 152 are connected in series between the connection point of the resistance element 144 and the capacitor 145 and the ground terminal. A connection point between the variable resistance element 151 and the resistance element 144 is connected to a non-inverting input terminal of the comparator 122 of the output adjustment unit 12. Thus, in the connection point, the voltage V _in corresponding to the target value of the output current of the power supply unit 11 is applied.

By characteristic adjusting section 15 is configured as described above, the voltage V _in is an adjustment signal is represented by Equation 2 below.
V _in = V _cc × (R ₁₅₁ + R ₁₅₂ ) / (R ₁₅₁ + R ₁₅₂ + R ₁₄₄ ) (Formula 2)

In other words, characteristic adjusting section 15, the voltage _{V in} is an adjustment signal corresponding to the series-connected is the sum of the resistance value of the variable resistance element 151 and 152 combined resistance value _{R 15V (= R 151 + R} 152), an output Output to the adjustment unit 12.

The above circuit configuration, the lighting circuit 1A, by outputting the voltage V _in is an adjustment signal based on an external input from the characteristic adjusting unit 15 to output adjustment unit 12, a voltage the voltage corresponding to the output current of the power supply unit 11 as substantially equal to the V _in, a feedback control.

Here, in the lighting circuit 1A according to the present embodiment, the variable resistance element 151 and the variable resistance element 152 are connected in series, and the maximum resistance value, the minimum resistance value, or the resistance value variable range is different. The voltage V _in that is the adjustment signal is set by the combined resistance value R _15V of the plurality of variable resistance elements 151 and 152, so that, for example, the voltage V _in is set by one variable resistance element. setting the resolution of the V _in is improved. That is, since the target value of the output current of the power supply unit 11 can be set with high accuracy, the light control level can be finely adjusted. Moreover, since it can respond to the wide specification change of the LED module 2 by changing the said synthetic | combination resistance value, the opportunity which must replace the lighting circuit itself and respond to the said specification change can be reduced. Moreover, since the lighting circuit 1A can cope with the output specifications of various types of LED modules 2, the mass production cost of the lighting circuit can be reduced.

  The variable resistance element 151 includes resistance elements 151A, 151B, 151C and 151D, and a switch element 151S. One terminal of the switch element 151 </ b> S is connected to one terminal of the variable resistance element 151, and one terminal of each of the resistance elements 151 </ b> A to 151 </ b> D is connected to the other terminal of the variable resistance element 151. The switch element 151S has a function of electrically connecting one terminal of the variable resistance element 151 and one of the respective terminals of the resistance elements 151A to 151D. With the above configuration, the switch element 151S selects one of the resistance elements 151A to 151D according to the operation of the external input person, so that the resistance value of the one resistance element becomes the resistance of the variable resistance element 151. Value.

  The variable resistance element 152 includes resistance elements 152A, 152B, 152C and 152D, and a switch element 152S. One terminal of the switch element 152S is connected to one terminal of the variable resistance element 152, and one terminal of each of the resistance elements 152A to 152D is connected to the other terminal of the variable resistance element 152. The switch element 152S has a function of electrically connecting one terminal of the variable resistance element 152 and one of the respective terminals of the resistance elements 152A to 152D. With the above configuration, the switch element 152S selects one of the resistance elements 152A to 152D according to the operation of the external input person, whereby the resistance value of the one resistance element becomes the resistance of the variable resistance element 152. Value.

When an external input person operates the switch element 151S of the variable resistance element 151 and the switch element 152S of the variable resistance element 152, the resistance values of the variable resistance elements 151 and 152 are selected, respectively. This not only linear adjustment of the voltage V _in, the light distribution, chromaticity and nonlinear adjustment color rendering and the like corresponding to the emission characteristics of the LED complexed becomes possible.

  FIG. 4 is a diagram illustrating a configuration example of the variable resistance elements 151 and 152 according to the first modification of the first embodiment. The rotary switch 151R shown in the figure embodies the variable resistance element 151, and includes three resistance elements 151A to 151C and one switch element 151S. The rotary switch 152R embodies the variable resistance element 152, and includes three resistance elements 152A to 152C and one switch element 152S. For example, the resistance values of the resistance elements 151A to 151C are set to about 1/10 of the resistance values of the resistance elements 152A to 152C. Thereby, for example, the hundreds of the current (mA) can be selected as 3, 4, or 5 by operating the rotary switch 151R. Further, by operating the rotary switch 152R, the tens digit of the current (mA) can be selected as 3, 5, or 7.

  In the above configuration, it is assumed that the current supplied to the LED module 2 is to be changed to 350 mA. In this case, when an external input person operates the selection operation unit shown in FIG. 4 (adjusts the direction of the arrow), for example, the resistance element 151A is selected in the rotary switch 151R (the tip of the arrow is “3”). In the rotary switch 152R, the resistance element 152B is selected (the tip of the arrow is directed to “5”).

As a result, the combined resistance value of the variable resistance elements 151 and 152 can be roughly adjusted by adjusting the resistance of the variable resistance element 151 and finely adjusted by adjusting the resistance of the variable resistance element 152. In other words, the high-precision synthetic resistance value, it is possible to set the voltage V _in a precise adjustment signal.

In this modification, the variable resistance elements 151 and 152 are connected in series. However, the variable resistance elements 151 and 152 may be connected in parallel between the connection point of the resistance element 144 and the capacitor 145 and the ground terminal. Good. Thus, for example, as compared with the case of setting the voltage V _in by one variable resistive element is improved setting resolution of the voltage V _in.

When the variable resistance elements 151 and 152 are connected in parallel, the variable resistance element 152 may have a maximum resistance value that is 1/10 or less of the maximum resistance value of the variable resistance element 151. In this case, the combined resistance value of the variable resistance elements 151 and 152 can be roughly adjusted by adjusting the resistance of the variable resistance element 152 and finely adjusted by adjusting the resistance of the variable resistance element 151. In other words, the high-precision synthetic resistance value, it is possible to set the voltage V _in a precise adjustment signal.

  Moreover, in the lighting circuit 1A according to the present modification, the characteristic adjusting unit includes two variable resistance elements as in the lighting circuit 1 according to the embodiment, but may include three or more. As the number of variable resistance elements included in the characteristic adjustment unit is larger, the dimming level can be adjusted with higher accuracy. The connection configuration and its effect when there are three or more variable resistance elements in the lighting circuit 1A are the same as the connection configuration and its effect when there are three or more variable resistance elements in the lighting circuit 1.

[1-4. Configuration example of variable resistance element]
FIG. 5 is a diagram illustrating a configuration example of the variable resistance element according to the second modification of the first embodiment. The figure shows a configuration example of a variable resistance element applicable to the lighting circuit 1 or 1A according to the present embodiment.

  As shown on the left side of FIG. 5, the variable resistance element 161 is, for example, a slide switch type element that selectively connects one of the two resistance elements by sliding a button in the vertical direction. The variable resistance element 161 includes two resistance elements having different resistance values and a sliding switch element. An external input person can change the resistance value of the variable resistance element 161 by sliding the variable resistance element 161.

  On the other hand, as shown on the right side of FIG. 5, the variable resistance element 162 includes a resistance adjustment unit that adjusts the resistance value of the variable resistance element 162. The resistance adjustment unit is, for example, a trimmer adjustment unit that can adjust the resistance value of the variable resistance element 162 in an analog manner using a clock driver or the like. An external input person can change the resistance value of the variable resistance element 162 by operating the resistance adjusting unit with a clock driver or the like.

  Two variable resistance elements 161 and 162 having different operation methods for external input as described above may be connected in series between the connection point of the resistance element 144 and the capacitor 145 of the characteristic adjustment unit 14 and the ground terminal. Good.

Thus, the combined resistance value of the variable resistance elements 161 and 162 can be coarsely adjusted by adjusting the resistance of the variable resistance element 161 and finely adjusted by adjusting the resistance of the variable resistance element 162. In other words, it is possible to adjust the combined resistance value at high accuracy, it is possible to set the voltage V _in a precise adjustment signal.

  The plurality of variable resistance elements according to the present embodiment may be combined with the variable resistance elements 161 and 162 and the rotary switch type variable resistance element 151 or 152 according to the first modification. Further, a rotary switch type variable resistance element, a slide switch type variable resistance element, and a trimmer adjustment type variable resistance element may be arbitrarily combined.

[1-5. Effect etc.]
As described above, the lighting circuit 1 according to the present embodiment includes the power supply unit 11 that outputs current to the LED module 2 and the signal for adjusting the light emission characteristics of the LED module 2, and the output of the power supply unit 11. The characteristic adjustment part 14 which outputs the adjustment signal corresponding to the target value of electric current, and the output adjustment part 12 which adjusts the output current of the power supply part 11 according to the adjustment signal output from the characteristic adjustment part 14 are provided. The characteristic adjustment unit 14 includes a plurality of variable resistance elements 141 and 142 having different maximum resistance values, minimum resistance values, or resistance value variable ranges, and corresponds to the combined resistance value defined by the connection of the variable resistance elements 141 and 142. The generated adjustment signal is output to the output adjustment unit 12.

  Thereby, the characteristic adjustment unit 14 generates the adjustment signal corresponding to the target value of the output current of the power supply unit 11 with high accuracy, and outputs the current with high accuracy from the power supply unit 11 to the LED module 2 according to the adjustment signal. It becomes possible. Therefore, the dimming level can be adjusted with high accuracy by the simplified circuit configuration of the lighting circuit 1.

  In the lighting circuit 1 according to the present embodiment, the variable resistance elements 141 and 142 are connected in series, and the characteristic adjusting unit 14 has a combined resistance value that is the sum of the resistance values of the variable resistance elements 141 and 142. You may output the adjustment signal produced | generated correspondingly to the output adjustment part 12. FIG.

  In the lighting circuit 1 according to the present embodiment, the variable resistance elements 141 and 142 are connected in parallel, and the characteristic adjustment unit is the reciprocal of the sum of the reciprocals of the respective resistance values of the variable resistance elements 141 and 142. An adjustment signal generated corresponding to a certain combined resistance value may be output to the output adjustment unit 12.

As a result, the adjustment signal is generated by the combined resistance value R _14V of the variable resistance elements 141 and 142. Therefore, compared with the case where the adjustment signal is generated by one variable resistance element, the accuracy (resolution) of the adjustment signal is higher. improves. That is, since the target value of the output current of the power supply unit 11 can be set with high accuracy, the light control level can be finely adjusted. Moreover, since it can respond to the wide specification change of the LED module 2 by changing the said synthetic | combination resistance value, the opportunity which has to replace the lighting circuit 1 itself and to respond to the said specification change can be reduced. Further, since the lighting circuit 1 can cope with the output specifications of various types of LED modules 2, the mass production cost of the lighting circuit 1 can be reduced.

  Further, in the lighting circuit 1 according to the present embodiment, the plurality of variable resistance elements are configured by a first variable resistance element to an nth variable resistance element (n is a natural number) in the descending order of the resistance value, and the kth. The maximum resistance value of the variable resistance element (k is a natural number of 1 to (n−1)) may be 10 times or more the maximum resistance value of the (k + 1) th variable resistance element.

  Thus, when a plurality of variable resistance elements are connected in series with each other, the combined resistance value of the plurality of variable resistance elements is roughly adjusted by adjusting the resistance of the kth variable resistance element, and the (k + 1) th variable resistance element is obtained. Fine adjustment is possible by adjusting the resistance. When the plurality of variable resistance elements are connected in parallel to each other, the combined resistance value of the plurality of variable resistance elements is roughly adjusted by adjusting the resistance of the (k + 1) th variable resistance element, and the kth variable resistance element Fine adjustment is possible by resistance adjustment. That is, a highly accurate adjustment signal can be set by a highly accurate combined resistance value. The combined resistance value can be set with an accuracy of about n digits, and the adjustment signal can be set with high accuracy according to the number of variable resistance elements.

  In the lighting circuit 1A according to the present embodiment, the variable resistance element 151 includes a plurality of resistance elements 151A to 151D having different resistance values and a switch element 151S, and the variable resistance element 152 has different resistance values. And a switching element 152S, and the switching elements 151S and 152S are respectively one of the plurality of resistance elements 151A to 151D and the plurality of resistance elements according to an external input. By selecting one of the resistance elements among 152A to 152D, the resistance value of the one resistance element may be the resistance value of the variable resistance elements 151 and 152.

  Thereby, when the external input person operates the switch element 151S of the variable resistance element 151 and the switch element 152S of the variable resistance element 152, the resistance values of the variable resistance elements 151 and 152 are selected, respectively. As a result, not only linear adjustment of the adjustment signal, but also non-linear adjustment corresponding to the light emission characteristics of the LED combined with light distribution, chromaticity, color rendering, and the like is possible.

  Further, in the lighting circuit 1 according to the present embodiment, the characteristic adjustment unit 14 may include two variable resistance elements 161 and 162 that are different in the external input operation method for changing the resistance value of the variable resistance element. Good.

  As a result, the combined resistance value of the variable resistance elements 161 and 162 can be roughly adjusted by adjusting the resistance of the variable resistance element 161 and finely adjusted by adjusting the resistance of the variable resistance element 162, for example. That is, since the combined resistance value can be adjusted with high accuracy, a highly accurate adjustment signal can be set.

(Embodiment 2)
[2-1. Lighting set configuration]
FIG. 5A is an external perspective view of an illumination set according to Embodiment 2. As illustrated in FIG. 5A, the lighting set 5 according to this modification includes the lighting circuit 1 according to Embodiment 1, and includes a lighting main body 50 and a lighting fixture 51.

  The illumination body 50 is a light emitting part of the illumination set 5 and has the LED module 2 inside the cover member.

  The lighting fixture 51 is a member serving as a base of the lighting set 5, and is fixed to the ceiling with, for example, bolts and nuts. The lighting body 50 is detachably attached to the lighting fixture 51. Further, a connector 52 is provided at the end of the lighting fixture 51, and an external AC power supply 3 is supplied to the lighting circuit 1 disposed in the lighting fixture 51 via the connector 52.

  Here, as shown in FIG. 5A, the variable resistance elements 141 and 142 included in the lighting circuit 1 are connected in series in the characteristic adjustment unit 14 and are arranged adjacent to each other on the surface of the illumination main body 50. Specifically, the variable resistance elements 141 and 142 are arranged adjacent to the central inclined surface (non-light emitting portion) in the longitudinal direction of the illumination main body 50.

  Each of the variable resistance elements 141 and 142 includes a resistance adjustment unit that adjusts a resistance value. For example, as shown in FIG. 5A, the resistance adjustment unit is a trimmer adjustment unit that can adjust the resistance values of the variable resistance elements 141 and 142 by operating a clock driver or the like.

  Thereby, since the variable resistance elements 141 and 142 are arrange | positioned on the surface of the illumination set 5, the operativity of an external input person improves. Further, since the variable resistance elements 141 and 142 are arranged adjacent to each other, the operability of the external input person is improved when the variable resistance elements 141 and 142 are operated alternately.

[2-2. Modification 1 of lighting set]
FIG. 5B is an external perspective view of an illumination set according to Modification 1 of Embodiment 2. As illustrated in FIG. 5B, the lighting set 6 according to this modification includes the lighting circuit 1 according to Embodiment 1, and includes a lighting main body 60 and a lighting fixture 61.

  The illumination body 60 is a light emitting part of the illumination set 6 and has the LED module 2 inside the cover.

  The luminaire 61 is a member serving as a base of the luminaire set 6 and is fixed to the ceiling with, for example, bolts and nuts. A lighting body 60 is detachably attached to the lighting fixture 61. Further, a connector 62 is provided at the end of the lighting fixture 61, and an external AC power supply 3 is supplied to the lighting circuit 1 disposed in the lighting fixture 61 via the connector 62.

  Here, as illustrated in FIG. 5A, the variable resistance element 141 included in the lighting circuit 1 is, for example, a variable resistance element that roughly adjusts the resistance value, and the variable resistance element 142 is more resistive than the variable resistance element 141. This is a variable resistance element for fine adjustment with a narrow range and high resistance value resolution. Further, the fine tuning variable resistance element 142 is disposed on the inclined surface (non-light emitting portion) of the central portion in the longitudinal direction of the illumination main body 60, and the coarse tuning variable resistance element 141 is the surface of the lighting fixture 61, It is arranged at the end of the lighting set 6 in the longitudinal direction. In other words, the fine tuning variable resistance element 142 is arranged on the surface of the illumination set 6 at a location where operability of external input by a clock driver or the like is higher than that of the coarse tuning variable resistance element 141. On the other hand, the variable resistance element 141 for coarse adjustment is disposed at a location where the operability of external input is low but the appearance is not impaired (low visibility) as compared with the variable resistance element 142 for fine adjustment.

  Thereby, the variable resistance element 141 becomes inconspicuous in the appearance of the illumination set 6, and the operability when the external input person adjusts the variable resistance element 142 for fine adjustment is improved. Therefore, it is possible to adjust the combined resistance value of the variable resistance elements 141 and 142 with higher accuracy while improving the design of the illumination set 6.

[2-3. Modification 2 of lighting set]
FIG. 7 is an exploded perspective view of an illumination set according to the second modification of the second embodiment. As shown in FIG. 7, the illumination set 4 according to the present modification includes an LED module 2E and a lighting fixture 4B. The lighting fixture 4B includes a lighting circuit 1 or 1A according to each of the above embodiments and a socket (not shown) for connecting the LED module 2. In the present embodiment, the luminaire 4B is a downlight, and includes a lamp body 41 that houses the lighting circuit and is mounted with the LED module 2E. Moreover, the LED module 2E is comprised from the housing | casing 250 which accommodates the circuit similar to the LED module 2, and equips an outer surface with the plug for connecting to the socket of the lighting fixture 4B.

  Since such a lighting fixture 4B includes the lighting circuit 1 or 1A according to the first embodiment, the same effects as those of the above-described embodiments and modifications can be achieved.

(Variations, etc.)
The lighting circuit, the lighting fixture, and the lighting set according to the present invention have been described above based on the embodiments and modifications. However, the present invention is not limited to these embodiments and modifications.

  For example, in the said embodiment and modification, although LED21 was comprised with the SMD type LED element, it is not limited to this. For example, as the LED 21, an LED chip itself mounted on a base may be employed.

  Moreover, in the said embodiment and modification, although LED21 was used as a solid light emitting element, you may use other solid light emitting elements, such as an organic EL (Electro Luminescence) element.

  In addition, the form obtained by making various modifications conceived by those skilled in the art with respect to each embodiment and modification, or the components and functions in each embodiment and modification are arbitrarily set within the scope of the present invention. Embodiments realized by combining these are also included in the present invention.

1, 1A lighting circuit 2, 2E LED module (solid state light emitting device module)
4, 5, 6 Illumination set 4B, 51, 61 Lighting fixture 11 Power supply unit 12 Output adjustment unit 14, 15 Characteristic adjustment unit 141, 142, 151, 152, 161, 162 Variable resistance element 151A, 151B, 151C, 151D, 152A , 152B, 152C, 152D Resistance element 151S, 152S Switch element

Claims (10)

A power supply for outputting current to the solid state light emitting device module;
A signal for adjusting the light emission characteristics of the solid state light emitting element module, a characteristic adjustment unit for outputting an adjustment signal corresponding to a target value of the output current of the power supply unit;
An output adjustment unit that adjusts an output current of the power supply unit according to the adjustment signal output from the characteristic adjustment unit;
The characteristic adjusting unit is
A plurality of variable resistance elements having different maximum resistance values, minimum resistance values, or resistance value variable ranges, and the output adjustment of the adjustment signal generated corresponding to a combined resistance value defined by connection of the plurality of variable resistance elements Lighting circuit that outputs to the unit. The plurality of variable resistance elements are connected in series,
The lighting circuit according to claim 1, wherein the characteristic adjustment unit outputs the adjustment signal generated corresponding to the combined resistance value, which is a sum of resistance values of the plurality of variable resistance elements, to the output adjustment unit. . The plurality of variable resistance elements are connected in parallel,
The characteristic adjustment unit outputs the adjustment signal generated corresponding to the combined resistance value, which is the reciprocal of the sum of the reciprocals of the resistance values of the plurality of variable resistance elements, to the output adjustment unit. The lighting circuit described. The plurality of variable resistance elements are composed of a first variable resistance element to an nth variable resistance element (n is a natural number) in descending order of resistance value,
4. The lighting device according to claim 2, wherein a maximum resistance value of the k-th variable resistance element (k is a natural number of 1 to (n−1)) is 10 times or more of a maximum resistance value of the (k + 1) -th variable resistance element. circuit. One variable resistance element of the plurality of variable resistance elements is:
A plurality of resistance elements and switch elements having different resistance values,
The resistance value of the one resistance element becomes the resistance value of the one variable resistance element when the switch element selects one of the plurality of resistance elements according to an external input. The lighting circuit of any one of -4. The lighting according to any one of claims 1 to 5, wherein the characteristic adjustment unit includes two variable resistance elements having different external input operation methods for changing the respective resistance values of the plurality of variable resistance elements. circuit. A lighting fixture comprising the lighting circuit according to any one of claims 1 to 6. A lighting fixture according to claim 7;
An illumination set comprising the solid-state light emitting element module. The illumination set according to claim 8, wherein the plurality of variable resistance elements are arranged adjacent to each other on the surface of the illumination set. The plurality of variable resistance elements are:
A variable resistance element for coarse adjustment for coarse adjustment of the resistance value;
A variable resistance element for fine adjustment having a narrower resistance adjustment range and higher resistance value resolution than the variable resistance element for coarse adjustment,
9. The fine-tuning variable resistance element is disposed at a location where operability of external input for changing the resistance value of each of the plurality of variable resistance elements is higher than that of the coarse tuning variable resistance element. Lighting set described in.

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