JP2014165074A - Illuminating device - Google Patents

Abstract

An illumination device capable of supplying an appropriate current to a light source regardless of the number of substrates provided with the light source is provided.
An illumination device includes a power supply unit, one or a plurality of light source units, and the like. The light source unit has a substrate provided with a light source. The light sources of the light source units are connected in parallel. The power supply unit supplies a current to the light source unit, a detection unit for detecting the amount of electricity related to the current flowing in the light source provided on one substrate to be detected, and supplies the amount of electricity detected by the detection unit to a predetermined amount. A current control unit for controlling the current supplied by the unit.
[Selection] Figure 3

Description

  The present invention relates to a lighting device including a plurality of substrates provided with a light source.

  In recent years, lighting devices using LEDs (light emitting diodes) as light sources have been developed for various applications, and replacement of lighting devices using conventional light sources such as incandescent bulbs and fluorescent lamps is being performed. For example, there is an illuminating device in which a plurality of appropriate-length substrates on which LEDs are mounted are arranged side by side on a wall or ceiling where indirect lighting is required.

  When using a plurality of substrates on which such LEDs are mounted, when the number of substrates to be connected is predetermined, an appropriate current is passed through the LEDs on each substrate to light the LEDs at a desired brightness. Can do. However, for example, when the number of substrates is changed in order to meet the user's request for the lighting environment, there is a risk that the current supplied to the LED will be excessive or insufficient, and the LED cannot be lit at a desired brightness. is there.

  Therefore, for example, a variable constant current source and a plurality of light emitting modules provided with LEDs are provided. Each light emitting module is provided with a resistor, and the current flowing through the resistor is converted into a voltage and detected, thereby connecting the light emitting modules. An illumination device that recognizes the number and supplies a current corresponding to the recognized number of connections to the light emitting module is disclosed (see Patent Document 1).

Japanese Patent No. 5046067

  However, the wider the portion to be illuminated, the more substrates need to be arranged, and the distance between the power supply unit that supplies current to each substrate and the substrate becomes longer, and the voltage drop due to wiring cannot be ignored. For this reason, an error occurs in the voltage detected by the resistor provided on each substrate, and the number of connected substrates may not be detected accurately. In addition, as the distance between the power supply unit and the farthest board is increased, the usage environment such as the ambient temperature also varies, so the voltage detected for each board also includes errors, and as a result, the connection is established. It is impossible to accurately detect the number of substrates. For this reason, there is a possibility that an appropriate current cannot be supplied to each light source.

  This invention is made | formed in view of such a situation, and it aims at providing the illuminating device which can supply an appropriate electric current to a light source irrespective of the number of the board | substrates in which the light source was provided.

  The illumination device according to the present invention includes a plurality of substrates provided with light sources, a light source unit in which the light sources of the plurality of substrates are connected in parallel, a supply unit that supplies current to the light source units, and the plurality of substrates A detection unit that detects an amount of electricity related to a current flowing through the light source provided on one of the detected substrates, and controls a current supplied by the supply unit so that the amount of electricity detected by the detection unit is a predetermined amount. And a current control unit.

  The illumination device according to the present invention includes a setting unit that sets a dimming rate of the light source unit, and the current control unit detects the amount of electricity detected by the detection unit when the supply unit starts supplying current. The current supplied from the supply unit is controlled so as to have a predetermined amount corresponding to the dimming rate set by the setting unit.

  The illumination device according to the present invention includes a PWM control unit that PWM-controls a current supplied from the supply unit when a dimming rate set by the setting unit is smaller than a predetermined value, and the current control unit includes the supply unit When the current supply starts, when the dimming rate set by the setting unit is smaller than the predetermined value, the current supplied by the supply unit for the predetermined time from the start of current supply is the predetermined value. The current value corresponding to is controlled to be larger than the current value, and the detection unit is configured to detect a current during the predetermined time.

  The illumination device according to the present invention includes a PWM control unit that PWM-controls a current supplied from the supply unit when a dimming rate set by the setting unit is smaller than a predetermined value, and the current control unit includes the supply unit When the current supply starts, when the dimming rate set by the setting unit is smaller than the predetermined value, the current supplied by the supply unit for the predetermined time from the start of current supply is the predetermined value. The current value corresponding to is controlled so that the detection unit detects a current during the predetermined time.

  In the illumination device according to the present invention, the plurality of substrates are provided with LEDs as the light sources, and are connected to a pair of power supply terminals connected to the anode of the LEDs, a pair of ground terminals, and a cathode of the LED. A bypass ground terminal connected to the ground terminal, the board other than the board to be detected is connected to the bypass ground terminal of another board, and the detection unit Is characterized in that it detects the quantity of electricity related to the current flowing through the bypass terminal of the substrate to be detected.

  According to the present invention, an appropriate current can be supplied to a light source regardless of the number of substrates provided with the light source.

FIG. 3 is a schematic diagram illustrating an example of an arrangement of lighting devices according to the first embodiment. 2 is an external perspective view showing an example of a configuration of a light source unit according to Embodiment 1. FIG. 3 is a block diagram illustrating an example of a configuration of a lighting device according to Embodiment 1. FIG. It is a time chart which shows an example of the current control at the time of the rating by a current control part. It is a time chart which shows an example of the current control at the time of light control by a current control part. It is a time chart which shows the other example of the current control at the time of the light control by a current control part. FIG. 10 is a block diagram illustrating an example of a configuration of a lighting device according to a second embodiment. FIG. 10 is a block diagram illustrating an example of a configuration of a lighting apparatus according to a third embodiment. FIG. 10 is a block diagram illustrating an example of a configuration of a lighting device according to a fourth embodiment. FIG. 10 is a block diagram illustrating an example of a configuration of a lighting device according to a fifth embodiment. FIG. 20 is a block diagram illustrating an example of a configuration of a lighting device according to a sixth embodiment.

(Embodiment 1)
Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof. FIG. 1 is a schematic diagram illustrating an example of the arrangement of the illumination device 100 according to the first embodiment. FIG. 2 is an external perspective view illustrating an example of the configuration of the light source unit 70 according to the first embodiment. As shown in FIG. 1, the illuminating device 100 includes a power supply unit 50, one or a plurality of light source units 70, 70a, and the like. The cable 1 is wired between the power supply unit 50 and the light source unit 70a closest to the rear stage side of the power supply unit 50 and between the light source units 70 and 70a. The power supply unit 50 is connected to a commercial power supply, converts an AC voltage from the commercial power supply into a DC voltage, and supplies the converted DC voltage, more specifically, a constant DC current to the light source units 70 and 70a. The power supply unit 50 can function as a constant current source. A configuration using a DC power supply instead of the commercial power supply may be used. The light source unit 70a closest to the rear stage side of the power supply unit 50 is also referred to as a detected light source unit in order to distinguish it from the other light source units 70. Further, as described later, the substrate of the detected light source unit 70a is also referred to as a detected substrate 83a, and is distinguished from the substrate 83 of the other light source units 70. The detected substrate 83a and the substrate 83 are the same. Further, the arrangement of the detected light source unit 70a is not limited to the vicinity of the rear stage side of the power supply unit 50.

  As shown in FIG. 2, the detected light source unit 70 a is mounted adjacent to each of the elongated detected substrate 83 a, the LED module 81 as a plurality of light sources mounted on the detected substrate 83 a, and the LED modules 81. A capacitor 82 serving as a protective element for protecting the module 81, an accommodating portion 84 for accommodating and fixing the substrate 83, and the like are provided. Similarly, the light source unit 70 includes an elongated substrate 83, an LED module 81 as a plurality of light sources mounted on the substrate 83, and a capacitor as a protective element that is mounted adjacent to each LED module 81 and protects the LED module 81. 82, an accommodation portion 84 for securing and accommodating the substrate 83, and the like.

  The accommodating portion 84 has a box shape in which one surface of the substrate to be detected 83a or the substrate 83 is opened, and can be placed on a shelf-like member provided on a ceiling or a wall. Further, the detected substrate 83a or the substrate 83 accommodated in the accommodating portion 84 may be a single substrate or a plurality of substrates.

  In the light source units 70 and 70 a, the LED modules 81 are connected in series, and a capacitor 82 is connected in parallel between the anode and the cathode of each LED module 81. Note that the capacitor 82 may not be provided.

  As shown in FIG. 1, the illuminating device 100 can illuminate a desired location by connecting an appropriate number of light source units 70 in addition to the detected light source unit 70a and arranging them in a desired arrangement. The detected light source unit 70a and the light source unit 70 form a light source unit. In the example of FIG. 1, the light source unit 70 is arranged in an L shape, but the arrangement example is not limited to this. Moreover, the number of the light source units 70 is not limited to the example of FIG. 1, For example, about 0-20 pieces can be connected. Further, the arrangement and connection method of the light source units 70 are not particularly limited.

  FIG. 3 is a block diagram illustrating an example of the configuration of the illumination device 100 according to the first embodiment. As shown in FIG. 3, the power supply unit 50 includes a supply unit 51, a current control unit 52, a detection unit 53, a resistor 54, an open / close switch unit 55, a stop unit 56, a dimming setting unit 57, a PWM control unit 58, and a lighting control. A unit 59, a power supply terminal S1, a ground terminal S2, a current detection terminal S3, and the like. In FIG. 3, two light source units 70 and 70a are illustrated for simplicity. Further, the capacitor 82 is omitted.

  The detected light source unit 70a and the light source unit 70 include a plurality of LED modules 81 connected in series, a pair of power supply terminals V1 and V2 connected to the anode of the LED module 81 on the high potential side, a pair of ground terminals G1 and G2, a bypass terminal B connected to the cathode of the LED module 81 on the low potential side, a bypass ground terminal GB connected to the ground terminals G1 and G2, and the like.

  The power supply terminal S1 and the ground terminal S2 of the power supply unit 50 are respectively connected to the power supply terminal V1 and the ground terminal G1 of the detected light source unit 70a. The current detection terminal S3 of the power supply unit 50 is connected to the bypass terminal B of the detected light source unit 70a.

  The power supply terminal V2 and the ground terminal G2 of the detected light source unit 70a are respectively connected to the power supply terminal V1 and the ground terminal G1 of the light source unit 70 closest to the rear stage side of the detected light source unit 70a. The bypass ground terminal GB of the detected light source unit 70a is connected to the bypass terminal B of the light source unit 70 closest to the rear stage side of the detected light source unit 70a. With such a configuration, a plurality of LED modules 81 in which a plurality of LED modules 81 are connected in series to the detected light source unit 70a and the detected substrate 83a and the substrate 83 in each light source unit 70 are connected in parallel.

  That is, a current substantially equal to that of the LED modules 81 of the other light source units 70 is supplied to the LED module 81 of one light source unit 70 including the detected light source unit 70a. Therefore, as described later, by adjusting the amount of current flowing through the LED module 81 of the detected light source unit 70a to an appropriate value, it is possible to supply an appropriate current to the LED module 81 as the entire light source unit.

  The supply unit 51 includes a constant current source, and supplies a required current to the detected light source unit 70 a and the light source unit 70.

  The detection unit 53 detects the voltage across the resistor 54 connected between the current detection terminal S3 and the ground terminal S2. As can be seen from FIG. 3, the resistor 54 converts the current flowing through the current detection terminal S3, that is, the current flowing through the LED module 81 of the detected light source unit 70a into a voltage. The current flowing through the LED module 81 mounted on the detected substrate 83a in the detected light source unit 70a is indirectly detected among the plurality of substrates 83 and 83a in the detected light source unit 70a. That is, the amount of electricity detected by the detection unit 53 includes both voltage and current.

  The current control unit 52 controls the current supplied by the supply unit 51 based on the voltage (or current) detected by the detection unit 53. Specifically, the current control unit 52 uses the current detected by the detection unit 53 (which can be obtained by dividing the detected voltage by the resistance value of the resistor 54) as a predetermined current value of one light source unit 70 (for example, The current supplied by the supply unit 51 is controlled so as to substantially match the rated current, the dimming value at the time of dimming described later, and the like.

  For example, if the predetermined current supplied to one light source unit 70 is If, the current control unit 52 controls the current supplied by the supply unit 51 so that the current detected by the detection unit 53 becomes the predetermined current If. By supplying a desired predetermined current If to the detected light source unit 70a, an equivalent current If can be supplied to each of the other light source units 70.

  FIG. 4 is a time chart showing an example of current control at the time of rating by the current control unit 52. In FIG. 4, the horizontal axis indicates the elapsed time from when the power is turned on (when the supply unit 51 starts operating), and the vertical axis indicates the current supplied by the supply unit 51. Note that the chart in FIG. 4 schematically shows changes in current value, and does not accurately represent changes in actual current value.

  If the rated current of one light source unit 70 is represented by If and the number of parallel connections of the light source units 70 is N, the rated current I supplied by the supply unit 51 is I = N × If. As shown in FIG. 4, the supply unit 51 increases the current supplied. The detection unit 53 detects the current flowing through the resistor 54, and when the detected current is less than the rated current If, the current control unit 52 further increases the current supplied by the supply unit 51. When the current detected by the detection unit 53 becomes the rated current If at time t1, the current control unit 52 controls the current supplied from the supply unit 51 to be constant. At this time, the current supplied by the supply unit 51 is the rated current I (I = N × If).

  Thereby, regardless of the number of light source units 70 connected to the power supply unit 50, the appropriate current If can be similarly supplied to each light source unit 70.

  In the present embodiment, since only the current flowing through the detected light source unit 70a is detected, the number of the light source units 70 increases, and the power supply unit 50 and the last stage (disposed farthest from the power supply unit 50). Even if the distance to the light source unit 70 is increased, the current detection accuracy does not change, and the current can be detected accurately.

  In the present embodiment, since only the current flowing through the detected light source unit 70a is detected, the number of the light source units 70 increases, and the power supply unit 50 and the last stage (disposed farthest from the power supply unit 50). Even if the distance from the light source unit 70 becomes longer and the usage environment such as the ambient temperature differs, the current can be accurately detected without being affected by the change in the usage environment.

  Further, when the lighting device of the present embodiment is used as indirect lighting, the elongated light source unit 70 needs to be arranged in a relatively narrow place, and the width of the substrate 83 must be reduced due to restrictions on the installation location. Don't be. In the case where the light source units 70 are arranged side by side, if the interval between the LED modules 81 between the adjacent light source units 70 is longer than the interval between the LED modules 81 on the substrate 83, the brightness of the illumination occurs, resulting in uneven illumination. Become. For this reason, it is necessary to mount the LED modules 81 at appropriate intervals in the length direction of the substrate 83, and the LED modules 81 are also mounted on the end portions of the substrate 83 so that the joints of the light source modules 70 become dark. Therefore, the space for mounting the LED module 81 is very limited. According to the present embodiment, since it is not necessary to mount a resistor on the light source module 70, it is not necessary to secure a space on the substrate 83 for mounting the resistor. As a result, it is possible to reduce the component cost related to the resistance and facilitate the layout on the substrate.

  The detected light source unit 70a and the light source unit 70 include a plurality of LED modules 81 connected in series, a pair of power supply terminals V1 and V2 connected to the anode of the LED module 81 on the high potential side, a pair of ground terminals G1 and G2, a bypass terminal B connected to the cathode of the LED module 81 on the low potential side, and a bypass ground terminal GB connected to the ground terminals G1 and G2 are provided. With this configuration, the substrates 83 and 83a of the light source units 70 and 70a can be shared, and the component cost can be further reduced. Further, when a large number of light source units 70 are arranged, the substrates 83 and 83a having a common wiring pattern are used without distinguishing between the detected light source unit 70a that detects current and the other light source units 70. There is no restriction on the connection order of the light source units 70, and the connection or arrangement work of the light source units 70 can be simplified and facilitated, and the workability of installing the lighting device is greatly improved.

  As shown in FIG. 3, an open / close switch unit 55 is connected in parallel with the resistor 54. The open / close switch unit 55 may be, for example, a relay or a semiconductor switch such as an FET.

  The stop unit 56 controls the opening and closing of the contacts of the open / close switch unit 55. The stop unit 56 opens the contact of the open / close switch unit 55 when the power of the lighting apparatus 100 is off, that is, when the supply unit 51 is not supplying current.

  The lighting device 100 is turned on, that is, the supply unit 51 starts supplying current, the current detected by the detection unit 53 becomes the predetermined current value If, and the current supplied by the supply unit 51 is the rated current I (I = N × If), the contact of the open / close switch unit 55 is closed, and the detection operation of the detection unit 53 is indirectly stopped. As a result, it is possible to prevent a current from constantly flowing through the resistor 54 and reduce power consumption.

  The dimming setting unit 57 functions as a setting unit that sets the dimming rate (for example, 100% to 1%) of the light source unit 70. For example, the dimming setting unit 57 includes a light receiving unit (not shown), and when the user transmits a dimming rate set by operating a remote controller (not shown) as a dimming signal, the dimming setting unit 57 receives the dimming signal, and The dimming rate set by is stored.

  The supply unit 51 supplies a current corresponding to the dimming rate set by the dimming setting unit 57 to each light source unit 70. For example, if the current supplied to each light source unit 70 is 100% when the dimming rate is 100%, the current supplied to each light source unit 70 is 0.5 × If when the dimming rate is 50%. Become.

  Since the supply unit 51 outputs a continuous drive direct current, the peak value of the current waveform at the dimming rate of 50% is ½ of the peak value of the current waveform at the dimming rate of 100%.

  When the dimming rate set by the dimming setting unit 57 is smaller than the predetermined value α2%, the PWM control unit 58 changes the current supplied by the supply unit 51 from continuous driving (without PWM control) to intermittent driving (with PWM control). ) And PWM control.

  When the peak value of the direct current supplied from the supply unit 51 is reduced according to the dimming rate, the lighting state of the LED module 81 may be uneven due to variations in the characteristics of the LED module 81. Therefore, when the dimming rate is smaller than a predetermined value α2% (for example, 20%), the current value is not controlled by the peak value of the current waveform, but the peak value of the current waveform is set to a required level. The lighting state of the LED module 81 can be stabilized by adjusting the current value by temporally intermittent operation while maintaining it.

  Next, a method of current control by the current control unit 52 when the dimming rate (excluding 100%) is set will be described.

  FIG. 5 is a time chart showing an example of current control during dimming by the current control unit 52. In FIG. 5, the horizontal axis indicates time, and the vertical axis indicates the current supplied by the supply unit 51. For convenience, the current on the vertical axis is shown corresponding to the dimming rate. Further, the chart of FIG. 5 schematically represents a change in current value, and does not accurately represent a change in actual current value.

  As shown in FIG. 5, it is assumed that the lighting device 100 is turned on at a dimming rate α1% (for example, 50%) before the lighting device 100 is turned off. When the lighting device 100 is turned off, the dimming rate α1% before turning off is stored in the dimming setting unit 57. The dimming rate α1% is a dimming rate that is larger than the predetermined value α2% and supplies current by continuous driving.

  When the power supply of the lighting device 100 is turned on and the supply unit 51 starts supplying current, the dimming setting unit 57 stores the dimming rate α1% set before turning off the light. 51 increases the current to supply a current corresponding to the dimming rate α1% to each light source unit 70.

  The detection unit 53 detects the current flowing through the resistor 54, and when the detected current is smaller than the current I1 corresponding to the dimming rate α1%, the current control unit 52 further increases the current supplied by the supply unit 51. When the current detected by the detection unit 53 becomes the current I1, the current control unit 52 controls the current supplied by the supply unit 51 to be constant. At this time, if the number of connected light source units 70 is N, the current supplied by the supply unit 51 is (N × I1).

  As described above, according to the present embodiment, when the lighting device 100 is turned on to start lighting, a current larger than the current corresponding to the dimming rate set before turning off the light is supplied to the LED module 81. Since it does not flow, it is possible to prevent the lighting device from becoming too bright at the start of lighting.

  FIG. 6 is a time chart showing another example of current control during dimming by the current control unit 52. In FIG. 6, the horizontal axis indicates time, and the vertical axis indicates the current supplied by the supply unit 51. For convenience, the current on the vertical axis is shown corresponding to the dimming rate. Further, the chart of FIG. 6 schematically represents a change in current value, and does not accurately represent a change in actual current value. The difference from FIG. 5 is that the dimming rate before the lighting device 100 is turned off is smaller than the predetermined value α2%.

  As shown in FIG. 6, it is assumed that the lighting device 100 is turned on at a dimming rate β% (for example, 15%) in a state smaller than a predetermined value α2% (for example, 20%) before the lighting device 100 is turned off. In this case, the supply unit 51 supplies a direct current by intermittent drive under PWM control under the control of the PWM control unit 58. When the lighting device 100 is turned off, the dimming rate β% before turning off is stored in the dimming setting unit 57.

  When the power source of the lighting device 100 is turned on and the supply unit 51 starts supplying current, the dimming setting unit 57 stores a dimming rate β% smaller than a predetermined value α2% set before turning off. ing.

  Therefore, when the lighting device 100 is turned on again, the lighting control unit 59 does not use the dimming rate β% stored in the dimming setting unit 57 but the dimming rate greater than the predetermined value α2% for a predetermined time. α3% is set (for example, 40%). The dimming rate α3% can be set, for example, to a dimming rate at which the supply unit 51 performs continuous driving instead of intermittent driving by PWM control, but is not limited thereto, and is not limited to this. It is good also as a comparatively big light control rate among light rates. Further, the predetermined time is a relatively short time that allows the current flowing through the LED module 81 to be detected by the detection unit 53, and a change in brightness of the LED module 81 is visually recognized due to a current change during the predetermined time. It can be a time that is not possible.

  The supply unit 51 increases the current to supply the current corresponding to the light control rate α3% set by the lighting control unit 59 to each light source unit 70.

  The detection unit 53 detects the current flowing through the resistor 54, and when the detected current is smaller than the current I3 corresponding to the dimming rate α3%, the current control unit 52 further increases the current supplied by the supply unit 51. When the current detected by the detection unit 53 becomes the current I3, the current control unit 52 controls the current supplied by the supply unit 51 to be constant. At this time, if the number of connected light source units 70 is N, the current supplied by the supply unit 51 is (N × I3).

  When the predetermined time has elapsed, the lighting control unit 59 validates the dimming rate β%, which is the dimming rate set by the dimming setting unit 57, and supplies a current corresponding to the dimming rate β%. Set.

  The supply unit 51 supplies a current corresponding to the dimming rate β% set by the dimming setting unit 57 to each light source unit 70.

  With the above configuration, even when the dimming rate set before the lighting device 100 is turned off is small and the current corresponding to the dimming rate cannot stably detect the current flowing through the LED module 81, Since the current flowing through the LED module 81 is detected by temporarily increasing the dimming rate and the current supplied from the supply unit 51 is controlled, the current is returned to the current corresponding to the original dimming rate. The current flowing through 70 can be set to an optimum value.

  In the example of FIG. 6, when the lighting device 100 is turned on again, the lighting control unit 59 is not the dimming rate β% stored in the dimming setting unit 57 but the predetermined value α2 for a predetermined time. However, the present invention is not limited to this. For example, when the lighting device 100 is turned on again, the lighting control unit 59 may set not the dimming rate β% stored in the dimming setting unit 57 but the predetermined value α2% for a predetermined time. it can.

  Instead of using the dimming rate α3% that is greater than the predetermined value α2%, the dimming rate for detecting the current and the dimming rate β% stored in the dimming setting unit 57 are obtained by using the predetermined value α2%. The current can be accurately detected while making the difference as small as possible. When the light is turned on at a dimming rate higher than the dimming rate β% stored in the dimming setting unit 57 even during a short time for detecting the current, the dimming rate returns to the set dimming rate β% after a predetermined time has elapsed. Therefore, there is a possibility that the user feels uncomfortable due to a phenomenon that it becomes brighter than the set value for a moment and then becomes darker. By using the predetermined value α2%, it is possible to reduce a change in brightness that may occur immediately after lighting.

(Embodiment 2)
FIG. 7 is a block diagram illustrating an example of a configuration of the illumination device 110 according to the second embodiment. The difference from the first embodiment is that the configurations of the detected light source unit 71 and the light source unit 72 are slightly different. The detected light source unit 71 is a light source unit for detecting current, and the light source unit 72 is another light source unit connected in parallel to the detected light source unit 71. The detected light source unit 71 and the light source unit 72 have different wiring patterns on the substrate. In FIG. 7, since the power supply unit 50 is the same as that of Embodiment 1, only the principal part is shown. The detected light source unit 71 has the same configuration as the detected light source unit 70a of the first embodiment. Further, the description of the same parts as those in Embodiment 1 is omitted.

  The light source unit 72 includes a pair of power supply terminals V1 and V2 connected to the anode of the LED module 81 on the high potential side, a pair of ground terminals G1 and G2 connected to the cathode of the LED module 81 on the low potential side.

  The detected light source unit 71 can be connected to the power supply unit 50, and a desired number of common light source units 72 can be connected to the subsequent stage of the detected light source unit 71.

  Also in the second embodiment, since only the current flowing through the detected light source unit 71 is detected, the number of the light source units 72 is increased, and the power source unit 50 and the light source at the last stage (disposed farthest from the power source unit 50). Even if the distance to the unit 72 is increased, the current detection accuracy does not change and the current can be detected accurately.

  Also in the second embodiment, since only the current flowing through the detected light source unit 71 is detected, the number of the light source units 72 is increased, and the power supply unit 50 and the last stage (distant from the power supply unit 50 are arranged). ) Even when the distance from the light source unit 72 becomes longer and the usage environment such as the ambient temperature differs, the current can be accurately detected without being affected by the change in the usage environment.

  In addition, the light source unit 72 of the second embodiment can use a substrate having a smaller number of connection terminals than the detected light source unit 71 and the light source unit 70 of the first embodiment. Cost can be reduced.

(Embodiment 3)
FIG. 8 is a block diagram illustrating an example of the configuration of the illumination device 120 according to the third embodiment. In the first and second embodiments, the power supply unit 50 is provided with the resistor 54 for detecting the current flowing through the LED modules 81 of the light source units 70a and 71 to be detected. Instead, a resistor 85 is provided in the detected light source unit 73. In FIG. 8 as well, the power supply unit 50 is the same as that of the first embodiment, so only the main part is shown. The light source unit 72 has the same configuration as the light source unit 72 of the second embodiment. Further, the description of the same parts as in the first and second embodiments is omitted.

  The detected light source unit 73 includes a pair of power supply terminals V1 and V2 connected to the anode of the LED module 81 on the high potential side, a pair of ground terminals G1 and G2, and a bypass connected to the cathode of the LED module 81 on the low potential side. A resistor 85 connected between the terminal B, the bypass terminal B and the ground terminals G1 and G2 is provided.

  The detected light source unit 73 can be connected to the power supply unit 50, and a desired number of common light source units 72 can be connected to the subsequent stage of the detected light source unit 73.

  Also in the third embodiment, since only the current flowing through the detected light source unit 73 is detected, the number of the light source modules 72 is increased, and the power source unit 50 and the light source at the last stage (disposed farthest from the power source unit 50). Even if the distance to the unit 72 is increased, the current detection accuracy does not change and the current can be detected accurately.

  Also in the third embodiment, since only the current flowing through the detected light source unit 73 is detected, the number of the light source modules 72 is increased, and the power supply unit 50 and the last stage (distant from the power supply unit 50 are arranged). ) Even when the distance from the light source unit 72 becomes longer and the usage environment such as the ambient temperature differs, the current can be accurately detected without being affected by the change in the usage environment.

  Compared to the third embodiment, in the first embodiment, since the current detection resistor 54 is arranged in the power supply unit 50, the substrate can be shared, and the influence of heat in the current detection is reduced. In addition, it can be said that the first embodiment is more excellent in that power saving can be achieved by short-circuiting the resistor 54 by the open / close switch unit 55.

(Embodiment 4)
FIG. 9 is a block diagram illustrating an example of the configuration of the illumination device 130 according to the fourth embodiment. The difference from the first embodiment is that a resistor 62 is connected in series between the output terminal of the supply unit 51 and the power supply terminal S1, and an open / close switch unit 64 is connected in parallel with the resistor 62. The detection unit 53 is capable of detecting not only the voltage across the resistor 54 but also the voltage across the resistor 62. In FIG. 9, only the main part of the power supply unit 50 is shown. The detected light source unit 70a and the light source unit 70 are the same as those in the first embodiment. Further, the description of the same parts as those in Embodiment 1 is omitted.

  In Embodiment 4, the detection part 53 detects the electric current which flows through the LED module 81 of the to-be-detected light source unit 70a. If the current flowing through the LED module 81 of one light source unit 70 is If and the number of connections of the light source modules 70 including the detected light source unit 70 is N, the current I supplied by the supply unit 51 is I = N × If. Become. Considering an error in the current flowing through the LED module 81 due to variations in the characteristics of the LED module 81, the current I supplied by the supply unit 51 can be expressed as I = N × If ± ΔI.

  Therefore, if the current flowing through the resistor 62 detected by the detection unit 53 is (N × If ± ΔI), it can be determined that each light source module 70 is operating normally. Further, when the current flowing through the resistor 62 detected by the detection unit 53 exceeds the range of (N × If ± ΔI), it can be determined that the light source module 70 is abnormal. Thereby, normality / abnormality of the light source module 70 can be easily determined.

  The lighting device 100 is turned on, that is, the supply unit 51 starts supplying current, the current detected by the detection unit 53 becomes the predetermined current value If, and the current supplied by the supply unit 51 is the rated current I (I = N × If), the contact of the open / close switch unit 64 is closed and the resistor 62 is short-circuited in the same manner as the open / close switch unit 55. As a result, it is possible to prevent a current from constantly flowing through the resistor 62 and reduce power consumption.

(Embodiment 5)
FIG. 10 is a block diagram illustrating an example of the configuration of the illumination device 140 according to the fifth embodiment. In the power supply unit 50, a capacitor 61 is connected in series between the output terminal of the supply unit 51 and the power supply terminal S <b> 1, and an open / close switch unit 64 is connected in parallel with the capacitor 61. The detection unit 53 detects a voltage between the power supply terminal S1 and the ground terminal S2. In addition, the power supply unit 50 has shown only the principal part.

  The light source unit 74 includes a pair of power supply terminals V1 and V2 connected to the anode of the LED module 81 on the high potential side, a pair of ground terminals G1 and G2 connected to the cathode of the LED module 81 on the low potential side, and the LED modules. 81 includes a capacitor 82 connected in parallel to the capacitor 81.

  For simplicity, the capacitance of the capacitor 61 is C1, and the combined capacitance of the capacitors 82 connected in series with each light source unit 74 is C2.

  When the forward voltage of each LED module 81 is Vf and the number of LED modules 81 included in each light source unit 74 is M, the power supply unit 50 has a voltage V0 output from the supply unit 51 smaller than (M × Vf). In a state where the voltage is set, control is performed so that the detection unit 53 detects the voltage between the power supply terminal S1 and the ground terminal S2. In this state, the contact of the open / close switch unit 64 is opened. In this state, since the voltage applied to each LED module 81 is smaller than the forward voltage, each LED module 81 is not lit.

  In a state where the voltage V0 output from the supply unit 51 is lower than (M × Vf), the detection unit 53 detects the voltage between the power supply terminal S1 and the ground terminal S2.

  When one light source unit 74 is connected to the power supply unit 50, the voltage V detected by the detection unit 53 can be expressed by V0 × {C1 / (C1 + C2)}. Further, when N light source units 74 are connected, it is equivalent to connecting N capacitors of capacitance C2 in parallel. Therefore, the voltage V detected by the detection unit 53 is V0 × {C1 / (C1 + N × C2)}.

  The relationship between the voltage V detected by the detection unit 53 and the number N of connections of the light source unit 74 is determined in advance, the number N of connections according to the detected voltage V is obtained, and the current I supplied by the supply unit 51 is expressed as I. By controlling to = N × If, the current If can be supplied to each light source unit 74. When supplying the current I, the supply unit 51 first closes the contact of the open / close switch unit 64 to short-circuit both ends of the capacitor 61, and then increases the voltage V0 to (M × Vf) or higher.

  Since the capacitor 82 is provided as a protective element for protecting the LED module 81, it is not necessary to newly provide a resistance or the like in each light source unit 74, reducing the component cost related to the resistance and facilitating the layout on the board. can do. Further, the substrate of the light source unit 74 can be shared.

(Embodiment 6)
FIG. 11 is a block diagram illustrating an example of the configuration of the illumination device 150 according to the sixth embodiment. The difference from the fifth embodiment is that the power supply unit 50 includes a resistor 62 instead of the capacitor 61, the detection unit 53 detects a voltage across the resistor 62, and a microcomputer 63. The light source unit 74 is the same as that of the fifth embodiment. The capacitor 82 may be provided or may not be provided.

  When the forward voltage of each LED module 81 is Vf and the number of LED modules 81 included in each light source unit 74 is M, the power supply unit 50 has a voltage V0 output from the supply unit 51 smaller than (M × Vf). In a state where the voltage is set, control is performed so that the detection unit 53 detects the voltage across the resistor 62. In this state, the contact of the open / close switch unit 64 is opened. In this state, since the voltage applied to each LED module 81 is smaller than the forward voltage, each LED module 81 is not lit.

  The detection unit 53 detects the voltage across the resistor 62 in a state where the voltage V0 output from the supply unit 51 is lower than (M × Vf).

  When the supply unit 51 outputs the voltage V0, a minute current flowing through the light source unit 74 (LED module 81) when one light source unit 74 is connected is denoted by ΔI1. The minute current is, for example, a minute current that flows through the LED module 81 in a state where the voltage applied to the LED module 81 is smaller than the forward voltage Vf.

  Similarly, when the supply unit 51 outputs the voltage V0, a minute current flowing through the light source unit 74 (LED module 81) when two light source units 74 are connected is denoted by ΔI2, and similarly the light source unit 74. Let ΔIN be a minute current flowing through the light source unit 74 (LED module 81) when N are connected.

  The microcomputer 63 holds in advance the relationship between the number N of light source units 74 connected and the minute current ΔIN. By dividing the voltage detected by the detection unit 53 by the resistance value of the resistor 62, the current flowing through the resistor 62 can be obtained. If the connection number N of the light source units 74 is obtained according to the obtained current and the current I supplied by the supply unit 51 is controlled to I = N × If, the current If can be supplied to each light source unit 74.

  After the supply unit 51 supplies the current I, the contact of the open / close switch unit 64 is closed and both ends of the resistor 62 are short-circuited, whereby the power consumption due to the current flowing through the resistor 62 can be reduced and the power consumption is reduced. be able to.

  Further, according to the sixth embodiment, an appropriate current can be supplied to each light source unit without adding a component such as a resistor to the substrate. Further, when the voltage is detected by the detection unit 53, the voltage applied to the LED module is smaller than the forward voltage, so that the LED module does not light or blink, and the user does not feel uncomfortable. In addition, since the voltage applied to the LED module is smaller than the forward voltage and only a minute current flows, power consumption can be reduced.

  According to the above-described first to sixth embodiments, an optimal current can be supplied to each light source unit regardless of the number of connected light source units. Also, even if an open failure occurs in a circuit such as a wiring pattern on one of the light source units or a circuit such as an LED module, a desired current continues to flow through the remaining light source units and the number of connections is reduced. There is no situation where a large amount of current flows through the remaining normal substrates due to the decrease.

  In the above-described embodiment, the example in which the LED is used as the light source of the power supply device has been described. However, the light source is not limited to the LED, and any other light source such as EL (Electro-Luminescence) can be used as long as it is a current-driven light source. It can also be applied to.

DESCRIPTION OF SYMBOLS 50 Power supply unit 51 Supply part 52 Current control part 53 Detection part 54, 62, 85 Resistance 55, 64 Opening / closing switch part 56 Stop part 57 Dimming setting part 58 PWM control part 59 Lighting control part 61 Capacitor 63 Microcomputer 70a, 71, 73 Detected light source unit 70, 72, 74 Light source unit 81 LED module 82 Capacitor 83 Substrate 83a Detected substrate

Claims (5)

A plurality of substrates provided with light sources, and a light source unit in which the light sources of the plurality of substrates are connected in parallel;
A supply unit for supplying current to the light source unit;
A detection unit for detecting an electrical quantity related to a current flowing through the light source provided on one of the plurality of substrates to be detected;
An illumination device comprising: a current control unit that controls a current supplied by the supply unit so that the amount of electricity detected by the detection unit is a predetermined amount. A setting unit for setting a dimming rate of the light source unit;
The current controller is
When the supply unit starts supplying current, the current supplied by the supply unit is controlled so that the amount of electricity detected by the detection unit becomes a predetermined amount corresponding to the dimming rate set by the setting unit. The lighting device according to claim 1, wherein the lighting device is configured as described above. When the dimming rate set by the setting unit is smaller than a predetermined value, a PWM control unit that PWM-controls the current supplied by the supply unit,
The current controller is
When the supply unit starts supplying current, if the dimming rate set by the setting unit is smaller than the predetermined value, the current supplied by the supply unit for a predetermined time from the start of current supply is set. Control is made to be greater than the current value corresponding to the predetermined value,
The detector is
The lighting device according to claim 2, wherein a current is detected during the predetermined time. When the dimming rate set by the setting unit is smaller than a predetermined value, a PWM control unit that PWM-controls the current supplied by the supply unit,
The current controller is
When the supply unit starts supplying current, if the dimming rate set by the setting unit is smaller than the predetermined value, the current supplied by the supply unit for a predetermined time from the start of current supply is set. The current value corresponding to the predetermined value is controlled to be controlled,
The detector is
The lighting device according to claim 2, wherein a current is detected during the predetermined time. The plurality of substrates are
LED as the light source is provided,
A pair of power supply terminals connected to the anode of the LED;
A pair of ground terminals;
A bypass terminal connected to the cathode of the LED;
A bypass ground terminal connected to the ground terminal;
Substrates other than the substrate to be detected are
The bypass terminal is connected to a bypass ground terminal of another substrate;
The detector is
The lighting device according to any one of claims 1 to 4, wherein an electric quantity related to a current flowing through a bypass terminal of the detection substrate is detected.

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