JP2015072739A - Lighting device, lighting equipment and lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device, lighting equipment and a lighting system that can enhance followability of control with suppressing variation of output light.SOLUTION: A setting unit 20 outputs a setting signal generated by adjusting a conduction angle of AC voltage. A rectifying circuit 3 performs full-wave rectification on the setting signal from the setting unit 20. A first converter circuit 4 converts the output of the rectifying circuit 3 to DC voltage having a predetermined voltage value. Second converter circuits 51a, 51b convert the voltage level of the output voltage of the first converter circuit 4, and output the converted voltage level to corresponding light source modules 6a, 6b. A PWM signal generating circuit 7 generates a PWM signal having the duty ratio corresponding to a conduction angle of the setting signal from the setting unit 20, and generates DC voltage corresponding to the duty ratio of the PWM signal. A first control circuit 9 controls the outputs of the second converter circuits 51a, 51b on the basis of a value obtained by feeding back the variation value of the output voltage of the first converter circuit 4 measured by a measuring circuit 14 to the output voltage of a smoothing circuit 8.

Description

  The present invention relates to a lighting device, a lighting fixture, and a lighting system, and more particularly, to a lighting device, a lighting fixture, and a lighting system capable of adjusting a light amount or a color temperature.

  Conventionally, there has been an LED drive circuit that controls a light emitting unit having a plurality of LED loads having different color tones according to a dimming signal input from a phase control dimmer (see, for example, Patent Document 1).

  A phase control dimmer generates an AC voltage that cuts a part of a sine waveform by turning on a switching element connected in series with an AC power supply at a certain phase angle of the AC power supply voltage. An AC voltage is output to the LED drive circuit as a dimming signal. The LED drive circuit performs toning and dimming by adjusting the currents flowing through the plurality of LED loads based on the dimming signal input from the phase control dimmer.

JP2012-134001A

  In the LED driving circuit described in Patent Document 1, when distortion is superimposed on the AC power supply voltage due to voltage fluctuation or noise, the distortion is also superimposed on the dimming signal output from the phase control dimmer. As a result, there is a possibility that the light output from the light emitting unit may fluctuate.

  This invention is made in view of the said subject, and it aims at providing the lighting device, the lighting fixture, and the illumination system which improved the followability of control, suppressing the fluctuation | variation of output light.

  The lighting device of the present invention includes an AC / DC conversion unit, a voltage conversion unit, a first signal generation unit, a second signal generation unit, a measurement unit, and a control unit. The AC / DC conversion unit receives the setting signal from an external setting device that outputs a setting signal generated by adjusting a conduction angle of an AC voltage input from an AC power source, and rectifies and smoothes the setting signal. Is converted into a DC voltage having a predetermined voltage value. The voltage conversion unit converts a voltage value of a DC voltage output from the AC / DC conversion unit and outputs the converted voltage value to a light source module having a solid state light emitting device. The first signal generator generates a PWM signal having a duty ratio corresponding to the conduction angle of the setting signal. The second signal generator generates a DC voltage having a voltage value corresponding to a duty ratio of the PWM signal by smoothing the PWM signal. The measurement unit measures a fluctuation value of a DC voltage output from the AC / DC conversion unit. The control unit controls the output of the voltage conversion unit based on a result of feeding back a variation value measured by the measurement unit to a DC voltage generated by the second signal generation unit.

  In this lighting device, the control unit outputs the output of the voltage conversion unit based on a command value obtained by superimposing the variation value measured by the measurement unit on the DC voltage generated by the second signal generation unit. It is also preferable to control.

  In this lighting device, if the absolute value of the fluctuation value measured by the measurement unit is less than a predetermined threshold, the control unit converts the voltage conversion unit based on the output voltage generated by the second signal generation unit. It is also preferable that the output is controlled. Further, the control unit feeds back the variation value measured by the measurement unit to the DC voltage generated by the second signal generation unit if the absolute value of the variation value measured by the measurement unit is equal to or greater than the threshold value. It is also preferable that the output of the voltage converter is controlled based on the result.

  The lighting fixture of the present invention includes any one of the lighting devices described above.

  The lighting fixture of the present invention includes a light source module having a solid light emitting element and any one of the lighting devices described above.

  In this lighting fixture, it is also preferable that a plurality of the light source modules are provided, and each of the plurality of light source modules is different from the other light source modules in the total value of forward voltages of the solid state light emitting elements.

  In this lighting apparatus, it is also preferable that a plurality of the light source modules are provided, and each of the plurality of light source modules includes the solid state light emitting element having a color temperature different from that of the other light source modules.

  The illumination system of the present invention includes any one of the above-described illumination fixtures and a setting device. The setting device outputs a setting signal generated by adjusting a conduction angle of an AC voltage input from an AC power source to the lighting fixture.

  According to the lighting device of the present invention, the second signal generator generates a DC voltage corresponding to the duty ratio by smoothing the PWM signal. Therefore, the distortion of the PWM signal is superimposed on distortion of the AC voltage. Even when the duty ratio fluctuates, fluctuations in the DC voltage output from the second signal generator can be suppressed. Therefore, even if distortion is superimposed on the AC voltage input from the AC power source due to power supply fluctuation or noise, fluctuations in the light output from the light source module can be suppressed. In addition, when the user operates the setting device to reduce the conduction angle of the setting signal, if the output power of the AC / DC conversion unit falls below the power required to turn on the light source module, the output of the AC conversion unit The voltage will drop from the predetermined voltage value. According to the lighting device of the present invention, the control unit controls the output of the voltage conversion unit based on the result of feeding back the fluctuation value measured by the measurement unit to the DC voltage generated by the second signal generation unit. The light output can be changed following the setting change of the setting device, and the followability of the control can be improved.

  With the lighting fixture of the present invention, it is possible to realize a lighting fixture with improved control followability while suppressing unintended output light fluctuations.

  With the illumination system of the present invention, it is possible to realize an illumination system with improved control followability while suppressing unintended fluctuations in output light.

It is a schematic block circuit diagram of the lighting device of the present embodiment. It is explanatory drawing explaining the light control and toning characteristic of the lighting device of this embodiment. It is a wave form diagram explaining operation | movement of the lighting device of this embodiment, (a) is a wave form diagram of the output voltage of the rectifier circuit 3, (b) is a wave form diagram of a PWM signal, (c) is an output voltage of the smoothing circuit 8. (D) is a waveform diagram of the output voltage of the measurement circuit 14. It is explanatory drawing explaining operation | movement of the lighting device of this embodiment. It is a wave form diagram explaining operation | movement of the lighting device of this embodiment. It is a wave form diagram explaining operation | movement of the lighting device of this embodiment. It is the schematic block circuit diagram which showed another circuit structure of the lighting device of this embodiment. It is a wave form diagram explaining operation | movement of the lighting device of this embodiment. It is a schematic sectional drawing of the lighting fixture of this embodiment.

  DESCRIPTION OF EMBODIMENTS Embodiments of a lighting device according to the present invention, a lighting fixture using the lighting device, and a lighting system will be described with reference to FIGS.

  The lighting device 1 of the present embodiment includes an AC / DC converter 2, a second converter circuit 51a, 51b, a PWM signal generation circuit 7, a smoothing circuit 8, a first control circuit 9, and a measurement circuit 14. .

  Further, the lighting device 1 of the present embodiment further includes a first power supply circuit 10, a start-up circuit 11, a second control circuit 12, a second power supply circuit 13, a filter circuit 15, and drive circuits 52a and 52b. The light source modules 6a and 6b are turned on.

  An AC 100 V AC power supply 100 is connected to the input side of the filter circuit 15 via a setting device 20. The rectifier circuit 3 is connected to the output side of the filter circuit 15.

  The lighting device 1 of this embodiment lights two types of light source modules 6a and 6b. The light source module 6a includes a plurality of light emitting diodes 61 (solid light emitting elements) that each emit light having a color temperature of about 2000K. The plurality of light emitting diodes 61 are connected in series or in parallel, and the plurality of light emitting diodes 61 are housed in a case (not shown) to be modularized as a light source module 6a.

  The light source module 6b includes a plurality of light emitting diodes 62 (solid light emitting elements) that each emit light having a color temperature of about 8000K. The plurality of light emitting diodes 62 are connected in series or in parallel, and the plurality of light emitting diodes 62 are housed in a case (not shown) to be modularized as a light source module 6b.

  In this embodiment, the light source module 6a and the light source module 6b have different color temperatures of irradiation light, and light (mixed light) obtained by mixing the irradiation light from the light source module 6a and the irradiation light from the light source module 6b is mixed. Irradiated.

  The setting device 20 is a dimmer that is used by the user to set the light amount and color temperature of light (mixed light) obtained by mixing the irradiation light from the light source module 6a and the irradiation light from the light source module 6b. The setting device 20 is a setting volume for the user to set a switching element (not shown) such as a thyristor connected in series with the AC power supply 100 and a phase angle for conducting the switching element every half cycle of the AC power supply voltage (Not shown). When the phase angle set by the setting volume comes every half cycle of the AC power supply voltage, the setting device 20 turns on the switching element and continues the conduction state of the switching element until the next zero cross, whereby the AC power supply 100 The lighting device 1 is supplied with electric power. Therefore, power is not supplied from the AC power supply 100 to the lighting device 1 until the phase angle set by the setting volume is reached from the zero cross of the AC power supply voltage, and an AC voltage in which a part of the sine waveform is cut is generated. . Thus, the setting signal generated by adjusting the conduction angle of the AC voltage input from the AC power supply 100 to the lighting device 1 is output from the setting device 20 to the lighting device 1. In the lighting device 1 of the present embodiment, the light amount and color temperature of the mixed color light are changed in proportion to the conduction angle of the setting signal, and the light adjustment and the color adjustment are performed according to the color adjustment / light adjustment curve as shown in FIG. It is carried out. Here, the conduction angle means a phase angle range in which the switching element included in the setting device 20 is conducting. For example, the conduction angle is 150 degrees before time t1 in FIG. 5 and the conduction angle is after time t1. It is 30 degrees.

  The setting device 20 used in the lighting device 1 of the present embodiment is a leading edge method, but the setting device 20 may be a trailing edge method. In the trailing edge method, the setting device 20 conducts the switching element from the zero cross of the AC voltage until the phase angle set by the setting volume is reached, and switches from the phase angle set by the setting volume to the next zero cross. Turn off the element. Thereby, for every half cycle of the AC power supply voltage, an AC voltage in which a part of the sine waveform is cut from the phase angle set by the setting volume to the next zero cross is output from the setting device 20 to the lighting device 1. .

  The AC / DC converter 2 rectifies and smoothes the setting signal input from the setting device 20 and converts it into a DC voltage having a predetermined voltage value. The AC / DC converter 2 of the present embodiment includes a rectifier circuit 3 that performs full-wave rectification on an AC voltage input from the setting device 20, and a first converter circuit 4 that smoothes the output of the rectifier circuit 3.

  The rectifier circuit 3 is constituted by a diode bridge circuit, for example. The rectifier circuit 3 performs full-wave rectification and outputs an alternating voltage (setting signal) input via the filter circuit 15.

  The first converter circuit 4 is a switching power supply such as a flyback converter. The first converter circuit 4 converts the output voltage of the rectifier circuit 3 into a DC voltage V2 having a predetermined voltage value by switching with a switching element (not shown).

  The output voltage V2 of the first converter circuit 4 is fed back to the second control circuit 12. The second control circuit 12 controls on / off of a switching element (not shown) included in the first converter circuit 4 so that the output voltage V2 fed back matches a preset voltage value. The second control circuit 12 is supplied with electric power necessary for operation from the first power supply circuit 10.

  The first power supply circuit 10 is supplied with a DC voltage from the primary side or the secondary side of the first converter circuit 4 formed of a flyback converter. The first power supply circuit 10 converts the DC voltage supplied from the first converter circuit 4 into a DC voltage having a constant voltage level, and supplies it to the second control circuit 12.

  For example, when the output voltage of the rectifier circuit 3 exceeds a certain level, the activation circuit 11 activates the first power supply circuit 10 to start a voltage conversion operation.

  The setting signal input from the setting device 20 to the lighting device 1 is input to the PWM signal generation circuit 7 (first signal generation unit) after full-wave rectification by the rectification circuit 3. 3A is a waveform diagram of the voltage signal V1 output from the rectifier circuit 3, and FIG. 3B is a waveform diagram of the PWM signal V3 output from the PWM signal generation circuit 7. FIG. The PWM signal generation circuit 7 compares the voltage signal V1 with a predetermined reference value. This reference value is a reference value used for detecting whether or not the voltage signal V1 is zero, and is set to a predetermined voltage value slightly larger than the noise level. When the voltage signal V1 exceeds the reference value, the PWM signal generation circuit 7 switches the output voltage level from the L level to the H level. When the voltage signal V1 falls below the reference value, the output voltage level is changed from the H level. Switch to L level. Therefore, the PWM signal V3 output from the PWM signal generation circuit 7 is H level in the phase angle range (conduction angle) in which the switching element of the setting device 20 is conductive, and the switching element of the setting device 20 is non-conductive. In the range of the phase angle (non-conduction angle), it becomes L level. Therefore, the PWM signal generation circuit 7 outputs a PWM signal V3 having a duty ratio corresponding to the conduction angle of the setting signal input from the setting device 20.

  The smoothing circuit 8 (second signal generating unit) is configured by, for example, an RC integrating circuit (not shown) in which a resistor and a capacitor are connected in series between the output terminal of the PWM signal generating circuit 7 and the circuit ground. ing. The PWM signal V3 input from the PWM signal generation circuit 7 is smoothed by the RC integration circuit, and a DC voltage V4 having a voltage level corresponding to the duty ratio of the PWM signal V3 is generated at both ends of the capacitor constituting the RC integration circuit. The DC voltage V4 is output to the first control circuit 9. In the present embodiment, the time constant of the RC integration circuit constituting the smoothing circuit 8 is set to a value sufficiently larger than the time of one cycle (half cycle of AC voltage) of the PWM signal V3. As shown in c), the DC voltage V4 is a substantially constant DC voltage. Since the ripple rate of the DC voltage V4 output from the smoothing circuit 8 is a very small value by setting the time constant, the error of the acquired value caused by the shift of the timing of acquiring the DC voltage V4 is suppressed. Yes. Therefore, the timing at which the first control circuit 9 takes in the DC voltage V4 may be slightly shifted in each cycle of the PWM signal V3, or the first control circuit 9 obtains an average value of the read values of the DC voltage V4. Can be eliminated.

  The measurement circuit 14 (measurement unit) measures the fluctuation value V5 of the DC voltage V2 output from the first converter circuit 4, and outputs the measurement result of the fluctuation value V5 to the first control circuit 9. Since the second control circuit 12 controls the output voltage V2 of the first converter circuit 4 to a predetermined voltage value at a constant time, the fluctuation value V5 measured by the measurement circuit 14 as shown in FIG. Becomes almost zero.

  The lighting device 1 of the present embodiment is configured to light two types of light source modules 6a and 6b, and includes a lighting circuit 5a that lights the light source module 6a and a lighting circuit 5b that lights the light source module 6b. Yes.

  The lighting circuit 5a includes a second converter circuit 51a serving as a voltage converter and a drive circuit 52a. The lighting circuit 5b includes a second converter circuit 51b as a voltage converter and a drive circuit 52b.

  The second converter circuits 51 a and 51 b are configured by, for example, a switching power supply (forward converter or buck converter), and the two second converter circuits 51 a and 51 b are connected in parallel to the output terminal of the first converter circuit 4. .

  The drive circuit 52a controls on / off of a switching element (not shown) included in the second converter circuit 51a in accordance with a control signal input from the first control circuit 9. The second converter circuit 51a converts the output voltage V2 into a voltage level corresponding to the control signal by switching the output voltage V2 of the first converter circuit 4, and outputs the voltage level to the light source module 6a.

  The drive circuit 52b controls on / off of a switching element (not shown) included in the second converter circuit 51b in accordance with a control signal input from the first control circuit 9. The second converter circuit 51b converts the output voltage V2 into a voltage level corresponding to the control signal by switching the output voltage V2 of the first converter circuit 4, and outputs it to the light source module 6b.

  The first control circuit 9 is realized using, for example, a microcomputer (such as RL78 / I1A manufactured by Renesas Electronics Corporation). The first control circuit 9 is supplied with power necessary for operation from the second power supply circuit 13. The second power supply circuit 13 converts the output voltage of the first converter circuit 4 into a voltage level suitable for the first control circuit 9 and supplies the voltage level to the first control circuit 9.

  The first control circuit 9 includes an A / D converter (not shown) that performs A / D conversion and takes in the DC voltage V4 output from the smoothing circuit 8 and the fluctuation value V5 measured by the measurement circuit 14. The DC voltage V4 and the fluctuation value V5 are A / D converted and captured at a predetermined timing.

  The first control circuit 9 determines a command value based on the result of feeding back the fluctuation value V5 measured by the measurement circuit 14 to the DC voltage V4 generated by the smoothing circuit 8. The first control circuit 9 includes a memory (not shown), and a table in which the output power of the second converter circuit 51a and the output power of the second converter circuit 51b are respectively associated with the command value. Is stored in advance. When the first control circuit 9 determines the command value based on the DC voltage V4 and the fluctuation value V5, the first control circuit 9 obtains the output power of the second converter circuits 51a and 51b with reference to the above table, and supplies the drive circuits 52a and 52b with the output power. Output a control signal. The drive circuit 52a controls the output of the second converter circuit 51a based on the control signal input from the first control circuit 9, and changes the light output of the light source module 6a. Similarly, the drive circuit 52b controls the output of the second converter circuit 51b based on the control signal input from the first control circuit 9, and changes the light output of the light source module 6b.

  Thus, the first control circuit 9 controls the outputs of the second converter circuits 51a and 51b based on the command values determined from the read values of the DC voltage V4 and the fluctuation value V5, and the light of the light source modules 6a and 6b. By changing the output, the color temperature and the light output ratio of the mixed color light are changed. FIG. 2 is an example of a light control / color control curve in which the lighting device 1 of the present embodiment changes the light output ratio and color temperature of mixed color light. In the light control / color control curve shown in FIG. 2, the light control / color control curve with the light output ratio from 0% to 90% is set to coincide with the light control curve for the incandescent lamp.

  Here, the vertical axis of the dimming / toning curve shown in FIG. 2 is the output power of the second converter circuits 51a and 51b, and the horizontal axis is replaced with the conduction angle or effective value of the voltage signal V1, or the dimming level. The static characteristics of the lighting device 1 shown are indicated by a solid line L1 in FIG. A solid line L2 in FIG. 4 indicates the effective value of the voltage signal V1 or the maximum power value that can be supplied from the first converter circuit 4 with respect to the conduction angle of the voltage signal V1.

  The operation of the lighting device 1 will be described with reference to FIGS. Until time t1 in FIG. 6, the conduction angle of the voltage signal V1 is set to 150 degrees. When the conduction angle is 150 degrees, the total output power P2 of the second converter circuits 51a and 51b is lower than the maximum power P1 that can be supplied from the first converter circuit 4 as shown in FIG. The output voltage V2 of the converter circuit 4 is controlled to a predetermined voltage value.

  On the other hand, when the user operates the setting device 20 at time t1 in FIG. 6 to suddenly reduce the conduction angle of the setting signal V1 from 150 degrees to 30 degrees, it is supplied from the first converter circuit 4 due to the reduction of the conduction angle. The maximum power possible is reduced to P3. Since the duty ratio of the PWM signal V3 decreases as the conduction angle decreases, the output voltage V4 of the smoothing circuit 8 decreases, and the first control circuit 9 decreases the output power of the second converter circuits 51a and 51b accordingly. Let Here, since the time constant of the smoothing circuit 8 is set to a large value in order to suppress the ripple rate, the output voltage V4 of the smoothing circuit 8 gradually decreases.

  When the first control circuit 9 controls the outputs of the second converter circuits 51a and 51b based only on the output voltage V4 of the smoothing circuit 8, the control for reducing the outputs of the second converter circuits 51a and 51b is delayed, and the second converter There is a possibility that the sum of the output powers of the circuits 51a and 51b exceeds the maximum power P3 that can be supplied from the first converter circuit 4 (region indicated by hatching in FIG. 4). When the outputs of the second converter circuits 51a and 51b exceed the maximum power P3 that can be supplied from the first converter circuit 4, the output voltage V2 of the first converter circuit 4 can maintain a predetermined voltage value as shown in FIG. Therefore, the output voltage V2 is suddenly decreased from the predetermined voltage value. Thereafter, control is performed to reduce the outputs of the second converter circuits 51a and 51b, and when the total output power of the second converter circuits 51a and 51b falls below the maximum power P3 that can be supplied from the first converter circuit 4, the first The output voltage V2 of the converter circuit 4 is controlled to a constant voltage.

  In addition, if the state where the power supplied from the first converter circuit 4 is insufficient continues, the output voltage V2 of the first converter circuit 4 continues to decrease, which not only affects the operation of the second converter circuits 51a and 51b, but also the light source There is also a possibility that the voltage required for lighting the modules 6a and 6b will be lower. Therefore, the current supplied to the light source modules 6a and 6b may not be stably controlled, and the light source modules 6a and 6b may not light up or may flicker. Here, when the supply power of the first converter circuit 4 is increased so that the supply power of the first converter circuit 4 is not insufficient, the first converter circuit 4 is provided with an excessive supply capacity in a steady state. As a result, the circuit components constituting the first converter circuit 4 are increased in size and cost.

  On the other hand, in the present embodiment, the first control circuit 9 outputs the output of the second converter circuits 51a and 51b based on the result of feeding back the fluctuation value V5 measured by the measurement circuit 14 to the output voltage V4 of the smoothing circuit 8. Is controlling. Specifically, the first control circuit 9 uses the second converter circuit 51a based on the value (V4 + V5) obtained by superimposing the fluctuation value V5 measured by the measurement circuit 14 on the output voltage V4 of the smoothing circuit 8. , 51b are controlled. If the supply capacity of the first converter circuit 4 is insufficient with respect to the total output power of the second converter circuits 51a and 51b, the output voltage V2 of the first converter circuit 4 falls below a predetermined voltage value, and the fluctuation value V5 is negative. It becomes the value of. Therefore, the value (V4 + V5) obtained by superimposing the fluctuation value V5 on the output voltage V4 is smaller than the output voltage V4, and the first control circuit 9 performs control so as to decrease the outputs of the second converter circuits 51a and 51b. Therefore, the output of the light source modules 6a and 6b can follow the decrease in the conduction angle. Accordingly, the shortage of the supply capability of the first converter circuit 4 is resolved in a shorter time, and the sum of the outputs of the second converter circuits 51a and 51b is less than the maximum value of the output power of the first converter circuit 4, so that the first converter The output voltage V2 of the circuit 4 is controlled to the original value (predetermined voltage value).

  As described above, the lighting device 1 of the present embodiment includes the light source modules 6a and 6b, the AC / DC converter 2, the second converter circuits 51a and 51b (voltage converter), and the PWM signal generator 7 (first). A signal generation unit), a smoothing circuit 8 (second signal generation unit), a measurement circuit 14 (measurement unit), and a first control circuit 9 (control unit). The light source modules 6a and 6b have solid light emitting elements. The AC / DC converter 2 receives a setting signal from an external setting device 20 that outputs a setting signal generated by adjusting the conduction angle of the AC voltage input from the AC power supply 100, and rectifies and smoothes the setting signal. Is converted into a DC voltage having a predetermined voltage value. The second converter circuits 51a and 51b convert the voltage value of the DC voltage output from the AC / DC converter 2 and output it to the light source modules 6a and 6b. The PWM signal generation circuit 7 generates a PWM signal V3 having a duty ratio corresponding to the conduction angle of the setting signal. The smoothing circuit 8 generates a DC voltage having a voltage value corresponding to the duty ratio of the PWM signal V3 by smoothing the PWM signal V3. The measurement circuit 14 measures the fluctuation value V5 of the DC voltage V2 output from the AC / DC converter 2. The first control circuit 9 controls the outputs of the second converter circuits 51a and 51b based on the result of feeding back the fluctuation value V5 measured by the measurement circuit 14 to the DC voltage V4 generated by the smoothing circuit 8.

  Even if the duty ratio of the PWM signal V3 changes due to distortion superimposed on the setting signal due to voltage fluctuations or noise of the power supply voltage, the smoothing circuit 8 smooths the PWM signal V3 and outputs it from the smoothing circuit 8. It is possible to suppress the output voltage V4 being changed. Therefore, even when distortion is superimposed on the AC voltage input from the AC power supply 100, fluctuations in the light output from the light source modules 6a and 6b can be suppressed. Further, when the user operates the setting device 20 to reduce the conduction angle of the setting signal, when the output power of the AC / DC conversion unit 2 is lower than the power required to turn on the light source modules 6a and 6b, The output voltage of the AC / DC converter 2 is lowered from the predetermined voltage value. According to the lighting device 1 of the present embodiment, when the output voltage V2 of the AC / DC converter 2 decreases due to insufficient power supplied to the AC / DC converter 2, the first control circuit 9 changes the output voltage V2. Since the value V5 is fed back to adjust the output of the second converter circuits 51a and 51b, the light output of the light source modules 6a and 6b can be made to follow the setting of the setting device 20. Further, the first control circuit 9 adjusts the outputs of the second converter circuits 51 a and 51 b, so that the total output power of the second converter circuits 51 a and 51 b increases the maximum value of the output power of the AC / DC converter 2. Since the power supply capacity of the AC / DC converter 2 is insufficient in a short time, the shortage of the supply capability of the AC / DC converter 2 is eliminated in a shorter time, so that the non-lighting and flickering of the light source modules 6a and 6b can be suppressed.

  Further, in the lighting device 1 of the present embodiment, the first control circuit 9 has the command value (V4 + V5) obtained by superimposing the fluctuation value V5 measured by the measurement circuit 14 on the DC voltage V4 generated by the smoothing circuit 8. Based on this, the outputs of the second converter circuits 51a and 51b are controlled.

  When the user operates the setting device 20 to reduce the conduction angle of the setting signal, if the output power of the AC / DC converter 2 falls below the power required to turn on the light source modules 6a and 6b, the AC / DC The output voltage of the converter 2 is reduced from the predetermined voltage value. In the present embodiment, the first control circuit 9 adjusts the outputs of the second converter circuits 51a and 51b based on a command value obtained by superimposing the fluctuation value V5 of the output voltage V2 on the output voltage V4 of the smoothing circuit 8. Therefore, the light output of the light source modules 6a and 6b can be made to follow the setting of the setting device 20. In addition, since the first control circuit 9 adjusts the outputs of the second converter circuits 51a and 51b, the shortage of the supply capability of the AC / DC converter 2 is eliminated in a shorter time. It is possible to suppress the non-lighting and flickering of 6a and 6b.

  By the way, in the lighting device 1 having the circuit configuration shown in FIG. 1, the first control circuit 9 takes in the output voltage V4 of the smoothing circuit 8 and the fluctuation value V5 measured by the measurement circuit 14, and the fluctuation value V5 is taken into the output voltage V4. To perform feedback. On the other hand, the lighting device 1 whose circuit configuration is shown in FIG. 7 includes a feedback circuit 18 that feeds back the fluctuation value V5 to the output voltage V4 of the smoothing circuit 8, and a voltage V7 obtained by feeding back the fluctuation value V5 to the output voltage V4. This is output to the first control circuit 9.

  The lighting device 1 whose circuit configuration is shown in FIG. 7 has the same components as the lighting device 1 whose circuit configuration is shown in FIG. 1 except for the measurement circuit 14 and the feedback circuit 18. Constituent elements are denoted by the same reference numerals and description thereof is omitted.

  The measurement circuit 14 includes a CR differentiation circuit 16 and an inverting amplification circuit 17.

  The CR differentiating circuit 16 includes a capacitor C1 having one end connected to the output terminal of the first converter circuit 4, and a series circuit of resistors R1 and R2 connected between the other end of the capacitor C1 and the circuit ground. . A voltage V6 obtained by dividing the fluctuation value of the output voltage V2 of the first converter circuit 4 by the resistance ratio of the resistors R1 and R2 is generated at the connection point of the resistors R1 and R2.

  The inverting amplifier circuit 17 includes an operational amplifier A1 and resistors R3 and R4. The resistor R3 is connected between the connection point of the resistors R1 and R2 and the inverting input terminal of the operational amplifier A1. The resistor R4 is connected between the inverting input terminal and the output terminal of the operational amplifier A1.

  The inverting amplifier circuit 17 outputs the voltage V6 obtained by inverting and amplifying the voltage V6 at the connection point of the resistors R1 and R2 with an amplification factor determined by the resistance ratio of the resistors R3 and R4.

  The feedback circuit 18 includes an operational amplifier A2, a resistor R5, a capacitor C2, and a diode D1. The resistor R5 is connected between the output terminal of the operational amplifier A1 and the inverting input terminal of the operational amplifier A2. The capacitor C2 is connected between the inverting input terminal and the output terminal of the operational amplifier A2. The cathode of the diode D1 is connected to the output terminal of the operational amplifier A2, and the anode of the diode D1 is connected to the output terminal of the smoothing circuit 8. A constant voltage circuit 19 that outputs a predetermined threshold voltage E1 (E1> 0) is connected to the non-inverting input terminal of the operational amplifier A2.

  Since the output voltage of the first converter circuit 4 is controlled to be substantially constant in the steady state, the output voltage V5 of the measurement circuit 14 becomes almost zero, the output voltage V7 of the operational amplifier A2 becomes high, and the diode D1 is non-conductive. It becomes the state of. In this case, the voltage V8 input to the first control circuit 9 is substantially the same as the output voltage V4 of the smoothing circuit 8, and the first control circuit 9 is based on the output voltage V4 of the smoothing circuit 8 in a steady state. The outputs of the second converter circuits 51a and 51b are controlled.

  On the other hand, when the setting angle of the setting signal input from the setting device 20 to the lighting device 1 is suddenly decreased due to the setting change of the setting device 20 and the power supplied to the first converter circuit 4 is insufficient, the output voltage of the first converter circuit 4 V2 falls from the predetermined voltage value. FIG. 8 shows the output voltage V2 of the first converter circuit 4, the output voltage V4 of the smoothing circuit 8, and the output voltage V6 of the CR differentiating circuit 16 when the conduction angle of the setting signal suddenly decreases from 150 degrees to 30 degrees at time t11. The time change of is shown. When the output voltage V2 of the first converter circuit 4 rapidly decreases due to a shortage of power supplied to the first converter circuit 4, the output voltage V5 of the measurement circuit 14 increases. When the output voltage V2 of the first converter circuit 4 decreases, the output voltage V6 of the CR differentiation circuit 16 decreases and the output voltage V5 of the measurement circuit 14 increases. When the output voltage V5 of the measurement circuit 14 exceeds the threshold voltage E1 at time t12, the output voltage V7 of the operational amplifier A2 decreases due to error amplification between the output voltage V5 and the threshold voltage E1. When the output voltage V7 of the operational amplifier A2 decreases to a voltage obtained by subtracting the forward voltage of the diode D1 from the output voltage V4 of the smoothing circuit 8, the diode D1 is turned on, and the sum of the output voltage V7 and the forward voltage VD1 of the diode D1 A certain voltage V8 (V8 = V7 + VD1) is input to the first control circuit 9. The first control circuit 9 controls the outputs of the second converter circuits 51a and 51b based on the voltage V8, and reduces the outputs of the second converter circuits 51a and 51b. When the first control circuit 9 performs control to decrease the outputs of the second converter circuits 51a and 51b, and the state where the supply power of the first converter circuit 4 is insufficient is resolved, the output voltage of the first converter circuit 4 V2 is controlled to a predetermined voltage value (time t13). When the output voltage V2 of the first converter circuit 4 is controlled to a predetermined voltage value, the fluctuation value V5 measured by the measurement circuit 14 becomes almost zero, and the first control circuit 9 also controls the output voltage of the smoothing circuit 8. Then, the output of the second converter circuits 51a and 51b is controlled.

  In the lighting device 1, when the output voltage V2 of the first converter circuit 4 varies, the feedback circuit 18 changes the voltage V8 so that the variation value V5 becomes a constant voltage corresponding to the threshold voltage E1, and the voltage V8 is the first voltage V8. 1 is input to the control circuit 9. Therefore, it is not necessary for the first control circuit 9 to perform arithmetic processing for feeding back the fluctuation value V5 to the output voltage V4, and the processing amount of arithmetic processing by the first control circuit 9 is reduced.

  Note that from which point the correction processing for feeding back the fluctuation value V5 measured by the measurement circuit 14 to the output voltage V4 of the smoothing circuit 8 by the setting of the threshold voltage E1 output from the constant voltage circuit 19 is effective. Can be determined. Further, although the output voltage V2 of the first converter circuit 4 slightly fluctuates in the steady state, an error generated in the steady state by setting the threshold voltage E1 to a value larger than the error of the output voltage V2 in the steady state. Is less likely to be fed back to the output voltage V4 of the smoothing circuit 8.

  As described above, in the lighting device 1 whose circuit configuration is shown in FIG. 7, the first control circuit 9 is configured to perform the following operation. That is, if the absolute value of the fluctuation value V5 measured by the measurement circuit 14 is less than a predetermined threshold value (threshold voltage E1), the first control circuit 9 uses the second converter based on the output voltage V4 of the smoothing circuit 8. The outputs of the circuits 51a and 51b are controlled. Further, if the absolute value of the fluctuation value V5 measured by the measurement circuit 14 is equal to or greater than the threshold value (threshold voltage E1), the first control circuit 9 returns the fluctuation value V5 to the output voltage V4 of the smoothing circuit 8. Based on this, the outputs of the second converter circuits 51a and 51b are controlled.

  Even if the duty ratio of the PWM signal V3 changes due to distortion superimposed on the setting signal due to voltage fluctuations or noise of the power supply voltage, the smoothing circuit 8 smooths the PWM signal V3 and outputs it from the smoothing circuit 8. It is possible to suppress the output voltage V4 being changed. If the fluctuation value V5 of the output voltage V2 of the first converter circuit 4 is less than the threshold voltage E1, the first control circuit 9 controls the outputs of the second converter circuits 51a and 51b based on the output voltage V4 of the smoothing circuit 8. doing. Therefore, even when distortion is superimposed on the setting signal due to voltage fluctuation or noise of the power supply voltage, fluctuation of light output from the light source modules 6a and 6b can be suppressed. Further, when the user operates the setting device 20 to reduce the conduction angle of the setting signal, when the output power of the AC / DC conversion unit 2 is lower than the power required to turn on the light source modules 6a and 6b, The output voltage V2 of the AC / DC converter 2 is lowered from the predetermined voltage value. When the fluctuation value V5 becomes equal to or higher than the threshold voltage E1, the first control circuit 9 feeds back the fluctuation value V5 to the output voltage V4 of the smoothing circuit 8 to adjust the outputs of the second converter circuits 51a and 51b. The light output of the light source modules 6a and 6b can be made to follow the setting of the setting device 20. In addition, since the first control circuit 9 adjusts the outputs of the second converter circuits 51a and 51b, the shortage of the supply capability of the AC / DC converter 2 is eliminated in a shorter time. It is possible to suppress the non-lighting and flickering of 6a and 6b.

  Note that the lighting device 1 described in the present embodiment includes a plurality of (for example, two) light source modules 6a and 6b, and each of the plurality of light source modules 6a and 6b has a solid-state light emitting element (a color temperature different from that of the other light source modules). Light emitting diodes 61 and 62) are provided. By changing the light output of the light source modules 6a and 6b having different color temperatures, both light control and color control can be performed.

  The light emitting diode 61 and the light emitting diode 62 may each use light emitted from the LED chip as it is, or the wavelength conversion member converts the wavelength of part of the light from the LED chip, You may utilize the light which mixed the light emitted and the light which a wavelength conversion member emits. In this case, even if the same LED chip is used for the light emitting diode 61 and the light emitting diode 62, the light emitting diode 61 and the light emitting diode 62 can emit light having different color temperatures by using different wavelength conversion members.

  Moreover, in the lighting device 1 of the present embodiment, each of the plurality of light source modules 6a and 6b may be different from the other light source modules in the total value of the forward voltage of the solid light emitting element. Dimming control can be performed by changing the light output of the light source modules 6a and 6b having different forward voltages.

  The color temperature of the light source modules 6a and 6b and the dimming curve of the output light illustrated in this embodiment are examples, and the color temperature of the light source modules 6a and 6b and the dimming curve of the output light are shown in this embodiment. It is not limited to this, and can be changed as appropriate. In addition, a characteristic curve (see FIG. 4) of the power that can be supplied from the first converter circuit 4 with respect to the conduction angle of the setting signal output from the setting device 20 is also an example, and is illustrated in a simplified manner. It is not limited to the characteristics of FIG. The light source modules 6a and 6b include a light emitting diode as a solid light emitting element, but may include an element other than the light emitting diode, such as an electroluminescence element, for example, as the solid light emitting element.

  Next, an example of the lighting fixture 30 using the lighting device 1 of the present embodiment will be described with reference to FIG.

  The lighting fixture 30 of this embodiment is embedded and arranged in the ceiling material 40, for example.

  The lighting fixture 30 includes a first case 31 that houses a plurality of light source modules 6a and 6b, and a second case 32 that houses the components of the lighting device 1.

  The first case 31 is made of a metal such as iron, aluminum, or stainless steel, and is formed in a cylindrical shape with an open bottom surface. At the lower end of the first case 31, an outer rod 33 that protrudes outward in the radial direction is integrally provided. A mounting substrate 34 on which the light source modules 6a and 6b are mounted is attached to the inner surface of the bottom wall (the upper side wall in FIG. 9) of the first case 31 with the light source modules 6a and 6b facing the opening. . The opening portion of the first case 31 is closed with a light diffusing plate 35, and the light emitted from the light source modules 6a and 6b passes through the light diffusing plate 35 and is irradiated to the outside. The light diffusing plate 35 has a function of diffusing light, and the light irradiated from the light source modules 6a and 6b is diffused by the light diffusing plate 35 and irradiated to a desired illumination area.

  The first case 31 is inserted into the mounting hole 41 formed in the ceiling material 40 from below, and is fixed to the ceiling material 40 with the upper surface of the outer casing 33 in contact with the peripheral edge of the hole 41. .

  The second case 32 is made of a metal such as iron, aluminum, or stainless steel and is formed in a box shape, and is placed on the ceiling material 40. Stands 36 are attached to both ends of the lower portion of the second case 32, and when the second case 32 is placed on the upper surface of the ceiling material 40 via the stand 36, the lower surface of the second case 32 and the ceiling material are placed. A gap is provided between the upper surface of 40.

  An electric wire 37 electrically connected to the light source modules 6 a and 6 b is drawn out from the first case 31, and a connector 37 a is connected to the tip of the electric wire 37. Further, from the second case 32, an electric wire 38 electrically connected to the output ends of the second converter circuits 51a and 51b is drawn out, and a connector 38a is connected to the tip of the electric wire 38. When the connector 37a and the connector 38a are connected, the second converter circuit 51a and the light source module 6a are electrically connected, and the second converter circuit 51b and the light source module 6b are electrically connected.

  The lighting fixture 30 of the present embodiment includes the lighting device 1 described above, and can realize a lighting fixture that suppresses unintended fluctuations in output light or improves the response of output light.

  The lighting system of the present embodiment includes the lighting device 1 described above and a setting device 20 that outputs a setting signal generated by adjusting the conduction angle of the AC voltage input from the AC power supply 100 to the lighting device 1. . Since the illumination system includes the lighting device 1 described above, it is possible to realize an illumination system that suppresses unintended fluctuations in output light or improves the response of output light.

  It should be noted that a wide variety of different embodiments can be configured without departing from the spirit and scope of the present invention, and the present invention is not limited to a specific embodiment.

DESCRIPTION OF SYMBOLS 1 Lighting device 2 AC / DC conversion part 3 Rectifier circuit 4 1st converter circuit 6a, 6b Light source module 7 PWM signal generation circuit (1st signal generation part)
8 Smoothing circuit (second signal generator)
9 First control circuit (control unit)
14 Measurement circuit (measurement unit)
20 Setting device 30 Lighting fixture 51a, 51b 2nd converter circuit (voltage conversion part)
61, 62 Light emitting diode (solid state light emitting device)
100 AC power supply V2 Output voltage V4 Output voltage V5 Fluctuation value

Claims (8)

The setting signal is input from an external setting device that outputs a setting signal generated by adjusting the conduction angle of the AC voltage input from the AC power supply, and the setting signal is rectified and smoothed to obtain a DC voltage having a predetermined voltage value. An AC / DC converter that converts to
A voltage conversion unit that converts a voltage value of a DC voltage output from the AC / DC conversion unit and outputs the voltage value to a light source module having a solid state light emitting element;
A first signal generator for generating a PWM signal having a duty ratio corresponding to the conduction angle of the setting signal;
A second signal generator for generating a DC voltage having a voltage value corresponding to a duty ratio of the PWM signal by smoothing the PWM signal;
A measurement unit for measuring a fluctuation value of a DC voltage output from the AC / DC conversion unit;
And a controller that controls an output of the voltage converter based on a result of feeding back a variation value measured by the measuring unit to a DC voltage generated by the second signal generating unit. apparatus.   The control unit controls an output of the voltage conversion unit based on a command value obtained by superimposing a variation value measured by the measurement unit on a DC voltage generated by the second signal generation unit. The lighting device according to claim 1. The control unit controls the output of the voltage conversion unit based on the output voltage generated by the second signal generation unit if the absolute value of the variation value measured by the measurement unit is less than a predetermined threshold value. Configured as
If the absolute value of the variation value measured by the measurement unit is equal to or greater than the threshold, the control unit feeds back the variation value measured by the measurement unit to the DC voltage generated by the second signal generation unit. The lighting device according to claim 1, wherein the lighting device is configured to control an output of the voltage conversion unit based on the above.   A lighting fixture comprising the lighting device according to any one of claims 1 to 3.   A lighting apparatus comprising: a light source module having a solid light emitting element; and the lighting device according to claim 1. A plurality of the light source modules;
The lighting apparatus according to claim 5, wherein each of the plurality of light source modules is different from the other light source modules in a total value of forward voltages of the solid state light emitting elements. A plurality of the light source modules;
The lighting apparatus according to claim 5, wherein each of the plurality of light source modules includes the solid-state light emitting element having a color temperature different from that of the other light source modules. A lighting fixture according to any one of claims 4 to 7,
A lighting system comprising: a setting device that outputs a setting signal generated by adjusting a conduction angle of an AC voltage input from an AC power source to the lighting fixture.

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