JP2021163588A - Luminaire - Google Patents

Abstract

To provide a luminaire capable of suppressing power consumption when the light is turned off while suppressing a delay in operation.SOLUTION: A luminaire includes a light source, and a lighting device that can change the lighting state of the light source while turning on the light source. The lighting device includes: a conversion circuit for converting a first DC voltage to a second DC voltage and supplying the second DC voltage to the light source; and a control circuit for receiving input of a state signal for controlling the stop or operation of the conversion circuit from the outside and a dimming signal for controlling the dimming degree of the light source, and controls the operation of the conversion circuit based on the state signal and the dimming signal.SELECTED DRAWING: Figure 1

Description

An embodiment of the present invention relates to a lighting device.

Lighting devices used in studios and stages are known. The lighting device converts the electric power supplied from the power source into electric power corresponding to a light source such as an LED (Light Emitting Diode) based on control information, and supplies the converted electric power to the light source to light the light source. It is equipped with a lighting device.

In such a lighting device, the lighting device is constantly driven in order to quickly execute control after receiving control information such as dimming and toning. Therefore, even in the extinguished state in which the light is not emitted from the light source, power is consumed in the standby state in which the control information can be received.

For this reason, it is desired that the lighting device can suppress the power consumption when the light is turned off while suppressing the delay in operation.

Japanese Unexamined Patent Publication No. 2016-181452

It is an object of the present invention to provide a lighting device capable of suppressing power consumption when the light is turned off while suppressing a delay in operation.

According to an embodiment of the present invention, the light source includes a light source and a lighting device capable of lighting the light source and changing the lighting state of the light source, and the lighting device changes the first DC voltage to a second DC voltage. Upon receiving the input of a conversion circuit that converts and supplies the second DC voltage to the light source, a state signal that controls the stop or operation of the conversion circuit from the outside, and a dimming signal that controls the dimming degree of the light source, the said Provided is a lighting device including a control circuit for controlling the operation of the conversion circuit based on a state signal and the dimming signal.

According to the embodiment of the present invention, it is possible to provide a lighting device capable of suppressing power consumption when the light is turned off while suppressing delay in operation.

It is a block diagram which shows typically the lighting apparatus which concerns on embodiment. It is a block diagram which shows typically the DC / DC conversion circuit which concerns on embodiment. It is a table which shows an example of the operation of the control circuit which concerns on embodiment schematically. It is a table which shows an example of another operation of the control circuit which concerns on embodiment schematically. It is a block diagram which shows typically the modification of the lighting apparatus which concerns on embodiment.

Hereinafter, each embodiment will be described with reference to the drawings.
The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the ratio of the sizes between the parts, and the like are not necessarily the same as the actual ones. Further, even when the same parts are represented, the dimensions and ratios may be different from each other depending on the drawings.
In addition, in the present specification and each figure, the same elements as those described above with respect to the above-mentioned figures are designated by the same reference numerals, and detailed description thereof will be omitted as appropriate.

FIG. 1 is a block diagram schematically showing a lighting device according to an embodiment.
As shown in FIG. 1, the lighting device 10 includes a light source 12 and a lighting device 14. The lighting device 10 is, for example, a lighting device for production that is installed and used in a studio, a stage, or the like.

The light source 12 has, for example, a light emitting element 12a. The light source 12 has, for example, a plurality of light emitting elements 12a. The plurality of light emitting elements 12a are connected in series. The plurality of light emitting elements 12a may be a combination of a series connection and a parallel connection. The number of light emitting elements 12a may be arbitrary. The number of light emitting elements 12a may be, for example, one.

For the light emitting element 12a, for example, a light emitting diode (LED) is used. The light source 12 is, for example, an LED module having a plurality of LEDs. The light emitting element 12a includes, for example, an organic light emitting diode (OLED), an inorganic electroluminescent light emitting element, an organic electroluminescent light emitting element, or another electroluminescent type light emitting element. It may be. However, the light source 12 is not limited to the one having the light emitting element 12a, and may be, for example, a light bulb or the like. The light source 12 may be any light source that is turned on by supplying a direct current.

The lighting device 14 can turn on the light source 12 and change the lighting state of the light source 12. The lighting device 14 is connected to, for example, the AC power supply 2, converts the AC voltage Vac supplied from the AC power supply 2 into a predetermined voltage, and supplies the light source 12 to the light source 12 to light the light source 12.

The lighting device 14 includes an AC / DC conversion circuit 20, a DC / DC conversion circuit 22 (conversion circuit), a control circuit 24, and a signal conversion unit 26.

The AC / DC conversion circuit 20 converts the AC voltage Vac supplied from the AC power supply 2 into the first DC voltage Vdc1.

The DC / DC conversion circuit 22 converts the first DC voltage Vdc1 into the second DC voltage Vdc2 and supplies the second DC voltage Vdc2 to the light source 12. The electric power supplied to the lighting device 14 is not limited to AC electric power, but may be DC electric power or the like. For example, the first DC voltage Vdc1 may be supplied to the lighting device 14. In this case, the AC / DC conversion circuit 20 can be omitted.

The control circuit 24 receives an input of a set signal from the outside and controls the operation of the DC / DC conversion circuit 22 based on the set signal to light the light source 12 in a lighting state corresponding to the set signal. The setting signal is input from the external device 4 to the lighting device 14 of the lighting device 10, for example. The external device 4 is, for example, a higher-level controller. The external device 4 may be called, for example, a dimmer.

The signal conversion unit 26 communicates with the external device 4. The signal conversion unit 26 receives the setting signal input from the external device 4 and converts the input setting signal into a setting signal in a format corresponding to the control circuit 24. Then, the signal conversion unit 26 inputs the converted setting signal to the control circuit 24. When it is not necessary to convert the signal, the setting signal input from the external device 4 may be directly input to the control circuit 24. The signal conversion unit 26 is provided in the lighting device 14 as needed and can be omitted.

FIG. 2 is a block diagram schematically showing a DC / DC conversion circuit according to the embodiment.
As shown in FIG. 2, the DC / DC conversion circuit 22 includes a constant current circuit 30 and a dimming circuit 40.

The constant current circuit 30 controls the output current so that the direct current supplied to the light source 12 becomes constant. The constant current circuit 30 has a pair of input terminals 30a and 30b and a pair of output terminals 30c and 30d. The pair of input terminals 30a and 30b are electrically connected to the output terminals of the AC / DC conversion circuit 20. As a result, the first DC voltage Vdc1 is supplied to the constant current circuit 30. The output terminal 30c is electrically connected to one end of the light emitting element 12a of the light source 12. The output terminal 30d is electrically connected to the other end of the light emitting element 12a of the light source 12. As a result, the direct current output from the constant current circuit 30 is supplied to the light source 12.

The constant current circuit 30 includes, for example, a switching element 31, an inductor 32, and a diode 33. The switching element 31 has electrodes 31a to 31c. The switching element 31 is, for example, an n-channel type FET. For example, the electrode 31a is a drain, the electrode 31b is a source, and the electrode 31c is a gate. The switching element 31 may be, for example, a p-channel type FET, a bipolar transistor, or the like.

The electrode 31a is electrically connected to the input terminal 30a. The electrode 31b is connected to one end of the inductor 32. The other end of the inductor 32 is electrically connected to the output terminal 30c on the high potential side. The cathode of the diode 33 is electrically connected to the electrode 31b of the switching element 31. The anode of the diode 33 is electrically connected to the input terminal 30b and the output terminal 30d on the low potential side.

The electrode 31c is electrically connected to the control circuit 24. The switching element 31 switches according to the signal from the control circuit 24. The constant current circuit 30 controls so that the direct current supplied to the light source 12 becomes constant by switching the switching element 31, for example.

Further, in this example, the constant current circuit 30 is a so-called step-down chopper circuit. The constant current circuit 30 steps down the voltage value of the first DC voltage Vdc1 to a voltage value corresponding to the light source 12. The configuration of the constant current circuit 30 is not limited to the above, and may be any configuration capable of supplying a substantially constant current to the light source 12.

The dimming circuit 40 has a switching element 42 connected in parallel with the light source 12. The switching element 42 has electrodes 42a to 42c. As the switching element 42, the same one as described for the switching element 31 can be used.

The electrode 42a is electrically connected to the output terminal 30c of the constant current circuit 30. The electrode 42b is electrically connected to the output terminal 30d of the constant current circuit 30. As a result, the switching element 42 is connected in parallel with the light source 12. The electrode 42c is electrically connected to the control circuit 24. The switching element 42 switches according to the signal from the control circuit 24.

The dimming circuit 40 (DC / DC conversion circuit 22) and the control circuit 24 switch on / off of the switching element 42 according to the setting signal input from the external device 4, and the second DC voltage Vdc2 (2) to the light source 12 ( Dimming control of the light emitted from the light source 12 is performed by periodically switching the supply and stop of the supply (DC current). Therefore, in the lighting device 14, a charge storage element (for example, a capacitor) having a relatively large capacity for smoothing the voltage is not provided on the light source 12 side (output side) of the dimming circuit 40. As a result, for example, it is possible to prevent the rise and fall of the second DC voltage Vdc2, which changes in a pulse shape, from being delayed, resulting in an undesired dimming intensity.

In the dimming circuit 40, a direct current can be supplied to the light source 12 by turning off the switching element 42 connected in parallel with the light source 12. On the other hand, when the switching element 42 is turned on, the current flows through the switching element 42, so that the supply of the direct current to the light source 12 side is stopped.

The constant current circuit 30 further includes, for example, a detection unit 34. The detection unit 34 is provided on the downstream side of the light source 12 and the switching element 42, and when the switching element 42 is turned off and a direct current flows through the light source 12, the current value of the direct current flowing through the light source 12 is detected and switching is performed. When the element 42 is turned on and the supply of the direct current to the light source 12 is stopped, the current value of the direct current flowing through the switching element 42 is detected. The detection unit 34 is electrically connected to the control circuit 24 and inputs the detection result to the control circuit 24.

The detection unit 34 is provided, for example, between the terminal on the low voltage side of the light source 12 and the connection point of the electrode 42b of the switching element 42 and the input terminal 30b on the low potential side. The detection unit 34 is, for example, a detection resistor for detecting the current value of a direct current. The detection unit 34 may be, for example, a clamp-type ammeter that measures changes in magnetic flux or the like.

The control circuit 24 and the constant current circuit 30 are controlled so that the current value of the direct current flowing through the light source 12 and the switching element 42 becomes constant by switching the switching element 31 based on the detection result of the detection unit 34. .. Further, the control circuit 24 and the dimming circuit 40 perform dimming control of the dimming circuit 40 by switching the switching element 42 based on the set signal as described above. As a result, the light source 12 can be turned on with a desired brightness according to the set signal.

The dimming control performed by the control circuit 24 and the dimming circuit 40 includes, for example, either a pulse width modulation method or a pulse density modulation method. In the pulse width modulation method, for example, the greater the luminous intensity, the longer the on-period of the switching element 42, so that the brightness of the light emitted from the light source 12 is dimmed. In the pulse density modulation method, for example, the higher the luminous intensity, the higher the density of the switching element 42 during the on-period, so that the brightness of the light emitted from the light source 12 is dimmed.

In the lighting device 10 for production used by installing it in a studio or a stage, for example, it is desired to quickly bring the desired brightness from the off state to the on state. In the lighting device 10, while operating the constant current circuit 30, the switching element 42 of the dimming circuit 40 is turned on, and a substantially constant direct current is passed through the switching element 42, so that the direct current is transferred to the switching element 42 side. The light source 12 can be turned off while the current is flowing.

As a result, in the lighting device 10, by turning off the switching element 42, it is possible to quickly turn on the light source 12 with a desired brightness from the state in which the light source 12 is turned off. For example, as compared with the case where the operation of the constant current circuit 30 is stopped and the light source 12 is turned on from the state where the supply of the direct current is completely stopped, the light source 12 can be turned on quickly with a desired brightness. As described above, in the lighting device 10, high responsiveness can be obtained when the light source 12 is switched from the off state to the on state.

FIG. 3 is a table schematically showing an example of the operation of the control circuit according to the embodiment.
As shown in FIG. 3, the control circuit 24 has a normal operation mode, a stop operation mode, and a standby operation mode. The normal operation mode is an operation mode in which the operation of the DC / DC conversion circuit 22 is controlled based on the set signal. The stop operation mode is an operation mode in which the operation of the DC / DC conversion circuit 22 is stopped and the light source 12 is turned off. In the standby operation mode, by operating at least a part of the DC / DC conversion circuit 22, the response speed when switching the light source 12 from the off state to the on state is faster than the stop operation mode while turning off the light source 12. This is the operating mode.

As shown in FIG. 3, the setting signal includes a state signal and a dimming signal. The state signal is a signal indicating switching between the lighting state and the extinguishing state of the light source 12. The dimming signal is a signal representing the dimming degree of the light source 12.

The setting signal is, for example, a DMX signal capable of controlling a signal of 256 channels in 256 steps. The state signal is, for example, a channel of the DMX signal. As shown in FIG. 3, for example, channel 0 corresponds to the stopped state of the DC / DC conversion circuit 22, and channels 1 to 255 correspond to the operating state of the DC / DC conversion circuit 22. The dimming signal is assigned to the lighting device 10 as a signal different from the state signal, and is, for example, a setting of 256 steps for each channel. As a result, the luminous intensity of the light source 12 can be controlled in 256 gradations. Further, for example, "0" of the dimming signal corresponds to 0% of the dimming degree of the light source 12. In other words, the dimming signal "0" corresponds to the extinguished state of the light source 12. As described above, in this example, the DC / DC conversion circuit 22 and the light source 12 can be controlled by the state signal and the dimming signal.

In the control circuit 24, when the setting signal is not input (operation 1 in FIG. 3), the setting signal is input, but the state signal is stopped (0) and the dimming signal is extinguished (dimming degree 0%). ) (Operation 2 in FIG. 3), the operation is performed in the stop operation mode, and the operation of the DC / DC conversion circuit 22 is stopped. Further, the control circuit 24 executes the normal operation mode regardless of the content of the input state signal when the dimming signal is larger than the dimming degree of 0% when the setting signal is input (FIG. 3). Operation 3, operation 5). In the operation 3 of FIG. 3, the operation may be performed in the stop operation mode.

In the normal operation mode, the control circuit 24 switches the switching element 31 based on the detection result of the detection unit 34 so that the current value of the direct current flowing through the light source 12 and the switching element 42 becomes constant. At the same time, the dimming control of the dimming circuit 40 is performed by switching the switching element 42 based on the dimming degree represented by the dimming signal. As a result, the light source 12 can be turned on with a brightness corresponding to the dimming intensity represented by the dimming signal.

The control circuit 24 executes the standby operation mode when the state signal of the input setting signal is in the operating state and the dimming signal is in the extinguished state (dimming intensity 0%) (operation 4 in FIG. 3).

In the standby operation mode, the control circuit 24 switches the switching element 31 based on the detection result of the detection unit 34 so that the current value of the direct current flowing through the light source 12 and the switching element 42 becomes constant. At the same time, the switching element 42 is turned on and the supply of the direct current to the light source 12 side is suppressed, so that the light source 12 is turned off. As a result, in the standby operation mode, when the dimming degree of the dimming signal becomes greater than 0%, the light source 12 can be transitioned relatively quickly from the extinguished state to the lit state with a desired brightness. can. In other words, the standby operation mode is a state in which the luminous intensity is set to 0% in the normal operation mode. The standby operation mode may be considered as a part of the operation of the normal operation mode, for example.

The control circuit 24 transitions from the stop operation mode to the normal operation mode when the dimming degree of the dimming signal changes from 0% to a value larger than 0% when the state signal of the input setting signal is in the stopped state. (Operation 3 in FIG. 3). As described above, even if the state signal is a signal indicating a stopped state, the control circuit 24 gives priority to the dimming signal side when the dimming signal is a signal indicating a lighting state, and operates in the normal operation mode. To execute.

The control circuit 24 executes the stop operation mode when the state signal of the input setting signal is in the stop state and the dimming degree of the dimming signal is 0% (operation 2 in FIG. 3).

In the stop operation mode, the control circuit 24 stops the input of the signal to the switching element 31, stops the operation of the constant current circuit 30, and stops the input of the signal to the switching element 42, so that the dimming circuit 40 By stopping the operation of, the operation of the DC / DC conversion circuit 22 is stopped and the light source 12 is turned off.

In this way, when the light source 12 is turned off, the constant current circuit 30 and the dimming circuit 40 are stopped in the stop operation mode, and the constant current circuit 30 and the dimming circuit 40 are stopped in the standby operation mode. To operate. As a result, in the stop operation mode, the power consumption when the light is turned off can be suppressed as compared with the standby operation mode. On the contrary, in the standby operation mode, it is possible to suppress the delay in the operation when the state is changed from the off state to the on state as compared with the stop operation mode.

In the stop operation mode, the control circuit 24, for example, only detects the set signal. That is, in the stop operation mode, by only receiving the set signal, it is possible to further suppress the power consumption when the light is turned off while enabling the operation based on the set signal.

Then, the control circuit 24 executes the stop operation mode when the setting signal is not detected (operation 1 in FIG. 3). In the control circuit 24, for example, when the power is not turned on to the external device 4, or when the wiring between the external device 4 and the lighting device 14 is disconnected, a setting signal is input from the external device 4 to the lighting device 14. When not, execute the stop operation mode. In this way, the control circuit 24 executes the stop operation mode when the set signal is not detected, and executes the stop operation mode when the state signal is in the stop state.

In the stop operation mode, the control circuit 24 switches from the stop operation mode to the normal operation mode when a dimming signal having a dimming intensity greater than 0% is input. That is, the control circuit 24 switches from the operation 1 of FIG. 3 to the operation 3 or the operation 5, or from the operation 2 of FIG. 3 to the operation 3 or the operation 5.

Further, in the normal operation mode, when the input of the setting signal is interrupted, the control circuit 24 continues the normal operation mode from the timing when the input of the setting signal is interrupted until a predetermined time elapses, and the predetermined time elapses. The normal operation mode is switched to the stop operation mode according to the above. The predetermined time is, for example, about 180 seconds. As a result, it is possible to prevent the light source 12 from being momentarily turned off due to the momentary interruption of the set signal. Further, in the control circuit 24, when the state signal is in the stop operation, the dimming signal is changed from the normal operation mode to the stop operation mode, that is, when the dimming degree changes from 0% or more to the extinguished state. The normal operation mode (a state in which the light source 12 is turned off while operating the DC / DC conversion circuit 22) is continued from the timing when the light is turned off until a predetermined time elapses, and the normal operation mode is continued according to the elapse of the predetermined time. You may switch to the stop operation mode from. Similarly, the predetermined time is, for example, about 180 seconds. As a result, even if the stop operation mode is temporarily set, the control can be quickly executed when the dimming signal in the next lighting state is received.

The predetermined time described above may be changed based on, for example, a signal input from the outside such as an external device 4. Alternatively, the lighting device 10 may be provided with an operation unit so that the predetermined time can be changed based on the operation of the operation unit. The control circuit 24 may change the predetermined time based on a signal input from the outside, a signal input from the operation unit, or the like.

As described above, in the lighting device 10 according to the present embodiment, the control circuit 24 has a stop operation mode in which the operation of the DC / DC conversion circuit 22 is stopped and the light source 12 is turned off. As a result, the power consumption when the light source 12 is turned off can be suppressed. Further, the control circuit 24 controls the operation of the DC / DC conversion circuit 22 based on the set signal, and is in a standby operation when the dimming degree of the dimming signal is set to 0% in the normal operation mode in which the light source 12 is turned on. Become a mode. In the standby operation mode, the control circuit 24 operates at least a part of the DC / DC conversion circuit 22 to reduce the response speed when switching the light source 12 from the off state to the on state while turning off the light source 12. Make it faster than the stop operation mode. As a result, the delay in operation can be suppressed.

For example, when the light source 12 is temporarily turned off during the production, the control circuit 24 is set to the standby operation mode. As a result, when the light source 12 is turned on next time, the time until the light source 12 reaches the desired brightness can be shortened, and the delay in operation can be suppressed. For example, when the light source 12 is not used for a long time, the control circuit 24 is set to the stop operation mode. As a result, the power consumption when the light is turned off can be suppressed. Therefore, in the lighting device 10, it is possible to suppress the power consumption when the light is turned off while suppressing the delay in the operation.

The configuration of the DC / DC conversion circuit 22 is not limited to the configuration including the constant current circuit 30 and the dimming circuit 40. The configuration of the DC / DC conversion circuit 22 is limited to a configuration in which the dimming control of the light emitted from the light source 12 is performed by periodically switching the supply and stop of the supply of the second DC voltage Vdc2 to the light source 12. It's not something. The configuration of the DC / DC conversion circuit 22 may be, for example, a configuration in which the dimming control of the light emitted from the light source 12 is performed by changing the current value of the direct current according to the dimming degree of the dimming signal. The configuration of the DC / DC conversion circuit 22 may be any configuration capable of turning on the light source 12 with a brightness corresponding to the dimming signal.

The operation of the control circuit 24 in the standby operation mode is not limited to the operation of controlling the operation of the constant current circuit 30 and the dimming circuit 40, and the light source 12 is operated by operating at least a part of the DC / DC conversion circuit 22. Any operation may be used, in which the response speed when switching the light source 12 from the off state to the on state can be made faster than the stop operation mode while keeping the light off state.

In the above embodiment, the DMX signal is used as two setting signals, a state signal and a dimming signal, and the conversion circuit 22 is stopped and operated, and the dimming of the light source 12 is assigned to channels 0 to 255, respectively. ing. That is, channel 0 of the state signal is assigned to the stopped state of the DC / DC conversion circuit 22, and channels 1 to 255 are assigned to the operating state of the conversion circuit 22. By reducing the number of allocated channels in the stopped state to smaller than the allocated channels in the operating state, it is possible to prevent malfunctions such as setting mistakes. Further, channel 0 of the dimming signal is assigned according to the light source 12 in the extinguished state, and channels 1 to 255 are assigned according to the dimming degree. The channel allocation in the off state and the on state is not limited to the above, and may be arbitrarily set. Further, the setting signal is not limited to the DMX signal. The setting signal may be, for example, any signal having a state signal and a dimming signal.

FIG. 4 is a table schematically showing an example of another operation of the control circuit according to the embodiment.
As shown in FIG. 4, in this example, channels 0 and 1 correspond to the stopped state, and channels 2 to 255 correspond to the operating state.

The control circuit 24 executes the normal operation mode when the state signal of the input setting signal is in the stopped state of channel 0 and the dimming degree of the dimming signal is greater than 0% (operation 13 in FIG. 4). As described above, when the state signal is the stop state of channel 0 and the dimming signal is a signal indicating the lighting state, the control circuit 24 gives priority to the dimming signal side and executes the operation in the normal operation mode. ..

On the other hand, the control circuit 24 detects the input of the set signal and sets the stop operation mode when the state signal of the input set signal is in the stop state of one channel and the dimming degree of the dimming signal is greater than 0%. Execute (operation 15 in FIG. 4). As described above, when the state signal is a stop state of one channel and the dimming signal is a signal indicating a lighting state, the control circuit 24 gives priority to the state signal side and executes the operation of the stop operation mode.

In this way, by setting the state signal, it may be possible to select two extinguishing states, a mode in which the dimming signal side is prioritized and a mode in which the state signal is prioritized. Thereby, the convenience of the lighting device 10 can be further improved.

FIG. 5 is a block diagram schematically showing a modified example of the lighting device according to the embodiment.
As shown in FIG. 5, in the lighting device 10a, the light source 12 has a plurality of light emitting elements 12a to 12c, and the lighting device 14a has a plurality of DC / DC conversion circuits 22. Each of the plurality of DC / DC conversion circuits 22 generates a second DC voltage Vdc2, and supplies each of the plurality of second DC voltages Vdc2 to each of the plurality of light emitting elements 12a to 12c. The plurality of DC / DC conversion circuits 22 can be realized, for example, by providing a plurality of circuits shown in FIG. In this case, channels 0 to 255 are assigned to the dimming signals for each of the light emitting elements 12a to 12c, and for example, one as a state signal for the lighting device 10a and as a dimming signal for each of the light emitting elements 12a to 12c. Three, a total of four control signals are assigned.

The light emitting element 12a irradiates red light, for example, by applying a voltage. The light emitting element 12b irradiates green light, for example, by applying a voltage. The light emitting element 12c irradiates blue light, for example, by applying a voltage. The plurality of DC / DC conversion circuits 22 change the intensity of light of each color by changing the second DC voltage Vdc2 supplied to each of the light emitting elements 12a to 12c based on the set signal. As a result, light of any color can be emitted from the light source 12. So-called toning control can be performed. The plurality of light emitting elements 12a to 12c are not limited to red light, green light, and blue light, and may be light emitting elements that irradiate light having different color temperatures.

As described above, the lighting device 14a may be configured to include a plurality of DC / DC conversion circuits 22 that generate a plurality of second DC voltages Vdc2. The number of light emitting elements of the light source 12 is not limited to three, and may be four or more. The number of DC / DC conversion circuits 22 may be any number depending on the number of light emitting elements. Further, for example, a plurality of light sources 12 may be provided in the lighting device 10a, and the plurality of DC / DC conversion circuits 22 may supply a plurality of second DC voltages Vdc2 having different voltage values to each of the plurality of light sources 12.

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

2 AC power supply, 4 external equipment, 10, 10a lighting device, 12 light source, 12a to 12c light emitting element, 14, 14a lighting device, 20 AC / DC conversion circuit, 22 DC / DC conversion circuit, 24 control circuit, 26 signal conversion Unit, 30 constant current circuit, 31 switching element, 32 inductor, 33 diode, 34 detector, 40 dimming circuit, 42 switching element

Claims (6)

Light source and
A lighting device that can turn on the light source and change the lighting state of the light source,
With
The lighting device is
A conversion circuit that converts the first DC voltage to the second DC voltage and supplies the second DC voltage to the light source.
A state signal for controlling the stop or operation of the conversion circuit and a dimming signal for controlling the dimming degree of the light source are input from the outside, and the operation of the conversion circuit is controlled based on the state signal and the dimming signal. Control circuit and
A lighting device characterized by being equipped with. The lighting device according to claim 1, wherein the control circuit stops the operation of the conversion circuit when a signal for stopping the conversion circuit is input as the state signal. The lighting device according to claim 1 or 2, wherein the control circuit stops the operation of the conversion circuit when at least one of the state signal and the dimming signal is not input. The control circuit operates the conversion circuit and operates the light source when the dimming signal having a dimming degree greater than 0% is input when a signal for stopping the conversion circuit is input as the state signal. The lighting device according to any one of claims 1 to 3, wherein the lighting device is controlled based on the dimming signal. When the control circuit is turned off from the state of controlling the light source with a dimming intensity greater than 0% in a state where a signal for stopping the conversion circuit is input as the state signal, a predetermined time elapses. The lighting device according to any one of claims 1 to 4, wherein the conversion circuit is operated with the light source turned off. In a state where a signal for stopping the conversion circuit is input as the state signal, the control circuit starts from the timing at which the input is interrupted when at least one of the state signal and the dimming signal is interrupted. The lighting device according to any one of claims 1 to 5, wherein the conversion circuit is operated until a predetermined time elapses.

Images