JP6399450B2 - Lighting device and lighting apparatus - Google Patents

Description

  The present invention relates to a lighting device and a lighting fixture, and more particularly, to a lighting device that lights a solid light emitting element such as a light emitting diode, and a lighting fixture including the lighting device.

  2. Description of the Related Art Conventionally, various types of lighting fixtures including a solid light emitting element that is a light source and a lighting device that lights the solid light emitting element have been provided. Moreover, such a lighting device may be configured to adjust (light control) the output light of the solid state light emitting device by increasing or decreasing the output voltage / output current (see, for example, Patent Document 1).

Japanese Patent No. 4370901

  By the way, lighting equipment for high ceilings installed on the ceiling of gymnasiums and halls, and lighting equipment called floodlights, are compared to the lighting equipment used in homes and offices. The distance to the surface is far. For this reason, it is necessary to provide a plurality of light sources each having a large light output, a lighting device that lights the light source, and a control device that controls the lighting device (for example, dimming control).

  However, when a plurality of control devices individually control the lighting device, for example, when all light sources are switched from being turned off to being lit, there is a possibility that a deviation occurs in timing when each control device controls the lighting device.

  The present invention has been made in view of the above problems, and an object thereof is to suppress variation in control timing of a plurality of light source units.

  The lighting device of the present invention is a lighting device for lighting a plurality of light source units having solid-state light emitting elements, and converts a power supplied from an external power source to supply power to the light source unit separately. A control unit that controls the power supply unit so as to adjust power supplied to the light source unit, and the plurality of power supply units includes a switching power supply circuit and a control circuit that controls the operation of the switching power supply circuit; A control power supply circuit that generates a power supply for operating the control circuit, and the control unit generates a control signal that indicates an output level of the switching power supply circuit, and generates a plurality of the generated control signals. A control unit commonly applied to the control circuit of the power supply unit, and the control power supply circuit of any one of the power supply units And the control circuit of the plurality of power supply units controls the operation of the switching power supply circuit, and the output power of the switching power supply circuit is controlled by the control signal. It is characterized by being configured to match a value corresponding to the instructed output level.

  The lighting fixture of this invention has the said lighting device and the said several light source unit lighted by the said lighting device, It is characterized by the above-mentioned.

  The lighting device and the lighting fixture of the present invention have an effect that it is possible to suppress variations in control timing of the plurality of light source units.

It is a block diagram which shows embodiment of the lighting device which concerns on this invention. It is explanatory drawing for demonstrating the relationship between the duty ratio and output level in a lighting device same as the above. It is a circuit diagram of the power supply unit in a lighting device same as the above. It is the circuit diagram which a part of control circuit in the lighting device same as the above was omitted. It is a wave form diagram for operation | movement description of a lighting device same as the above. It is a wave form diagram for operation | movement description of a lighting device same as the above. 7A is a time chart for explaining the operation of the first power supply unit in the lighting device same as above, FIG. 7B is a time chart for explaining the operation of the second power supply unit in the lighting device same as the above, and FIG. 7C is a control unit in the lighting device same as the above. It is a time chart for description of operation | movement. It is a front view which shows embodiment of the lighting fixture which concerns on this invention. It is the perspective view seen from the back of the lighting fixture same as the above. FIG. 10A is a side view showing a state in which one lid is removed, and FIG. 10B is a cross-sectional view taken along line XX in FIG. 10A. It is the disassembled perspective view which a part of lighting device same as the above was omitted. It is the perspective view which a part of lighting device same as the above was omitted.

  Hereinafter, embodiments of a lighting device and a lighting fixture according to the present invention will be described in detail with reference to the drawings.

  As illustrated in FIG. 1, the lighting device 8 of the present embodiment includes a plurality (two in the illustrated example) of power supply units 4 and one control unit 6. However, the number of power supply units 4 is not limited to two, and may be three or more.

  Each power supply unit 4 is configured to convert an AC voltage / AC current supplied from an external power supply (for example, a commercial AC power supply AC) into a DC voltage / DC current and supply it to the light source unit 1. The light source unit 1 is configured to emit light (light on) by a DC voltage / DC current supplied from the power supply unit 4. Each power supply unit 4 is configured to increase / decrease (dim) the light output of the light source unit 1 by adjusting the DC voltage / DC current supplied to the light source unit 1. However, the detailed circuit configuration of each power supply unit 4 will be described later. A plurality of light source units 1 may be electrically connected in parallel to one power supply unit 4.

  The control unit 6 preferably includes a control unit 60, a dimming signal input unit 61, a control signal output unit 62, and a power supply unit 63. The power supply unit 63 receives control power (a first control power supply voltage Vcc described later) supplied from one of the two power supply units 4 (hereinafter referred to as a first power supply unit 4A as necessary). It is preferably configured to step down. A control power supply voltage (DC voltage lower than the first control power supply voltage Vcc) output from the power supply unit 63 is supplied to each unit of the control unit 60, the dimming signal input unit 61, and the dimming signal output unit 62.

  The dimming signal input unit 61 is preferably configured to convert the dimming signal input from the external controller 5 via the dimming signal line and pass it to the control unit 60. The controller 5 preferably generates a pulse width modulation (PWM) signal in which the dimming level corresponds to the on-duty ratio, and outputs the PWM signal to the control unit 6 as a dimming signal. Note that the controller 5 preferably generates and outputs a dimming signal according to a human operation, a time schedule, various sensor outputs, or the like. The dimming signal input unit 61 is preferably configured to convert the input dimming signal into a DC voltage signal proportional to the on-duty ratio and to pass the DC voltage signal to the control unit 60.

  The control unit 60 is preferably composed of, for example, a microcontroller. The control unit 60 is preferably configured to realize a function (fade-in function) of gradually increasing the dimming level when the light source unit 1 is turned on, an initial illuminance correction function, and the like. The initial illuminance correction function is the cumulative lighting time of the light source unit 1 so as to keep the light output of the light source unit 1 substantially constant (for example, 85% of the rating) from the start of use of the light source unit 1 to the end of its life. It is a function to adjust the light output correspondingly. That is, the control unit 60 measures the cumulative lighting time of the light source unit 1 with a timer built in the microcontroller, stores it in the built-in memory, and refers to the initial illuminance correction characteristics stored in advance in the memory. Then, the dimming level corresponding to the cumulative lighting time is determined. Here, the initial illuminance correction characteristic is a characteristic that gradually increases the dimming level (ratio when the rated light output is 100%) as the cumulative lighting time increases.

  Further, the control unit 60 generates a PWM signal having a duty ratio corresponding to the dimming level (output level), and causes the two power supply units 4 to output the PWM signal (control signal) from the control signal output unit 62. The control signal output unit 62 is preferably configured to amplify the PWM signal output from the control unit 60.

  Here, the relationship between the dimming level, that is, the output level of the DC power supplied to the light source unit 1 by each power supply unit 4, and the duty ratio of the PWM signal is shown in FIG. As shown in FIG. 2, the light control level (output level) is set to 100 [%] when the duty ratio is 0 to 5 [%], and the duty ratio is 98 [%] or more (however, 100 [%] is The light control level (output level) is 5% (lower limit). When the duty ratio is 5 to 98 [%], the dimming level (output level) decreases at a constant rate with respect to the increase of the duty ratio. Therefore, the signal level of the voltage signal output from the signal conversion circuit 49 of the power supply unit 4 becomes maximum at the lower limit value (5 [%]) of the dimming level (output level), and the dimming level (output level) is the same. Minimum at rated value. However, the relationship shown in FIG. 2 is an example, and the relationship between the light control level (output level) and the duty ratio is not limited to the relationship shown in FIG.

  Next, the circuit configuration of the power supply unit 4 will be described in detail with reference to FIGS. 3 and 4. However, the circuit configuration of the two power supply units 4 is common.

  As shown in FIG. 3, the power supply unit 4 of the present embodiment preferably includes a buck converter 40, a control circuit 41, a first control power supply circuit 42, and a second control power supply circuit 43. Furthermore, the power supply unit 4 of this embodiment preferably includes a PFC circuit 44, a filter circuit 45, a full-wave rectifier 46, a speed-up circuit 47, a PFC drive unit 48, a signal conversion circuit 49, and the like.

  The filter circuit 45 is configured to remove harmonic noise superimposed on the AC voltage / AC current supplied from the AC power supply AC and harmonic noise generated in the PFC circuit 44. The full-wave rectifier 46 is composed of a diode bridge, and full-wave rectifies the AC voltage / AC current supplied from the AC power supply AC. A PFC (Power Factor Correction) circuit 44 is a conventionally known step-up chopper circuit, which converts the pulsating current voltage that has been full-wave rectified by the full-wave rectifier 46 into a desired DC voltage, thereby generating a power factor. Configured to improve. In the PFC circuit 44, an inductor L1, a diode D1, and a smoothing capacitor C1 are electrically connected in series between the pulsating output terminals of the full-wave rectifier 46, and a parallel circuit of two switching elements Q11 and Q12 is smoothed with the diode D1. The capacitor C1 is electrically connected in parallel. The two switching elements Q11 and Q12 are semiconductor switching elements (for example, N-channel power MOSFETs) having common electrical characteristics. That is, the PFC circuit 44 includes a parallel circuit of two switching elements Q11 and Q12, so that the current flowing through the individual switching elements Q11 and Q12 is reduced to suppress the temperature rise. However, since the PFC circuit 44 has a conventionally well-known circuit configuration except that the two switching elements Q11 and Q12 are connected in parallel, detailed description of the operation is omitted. In the following description, the output voltage of the PFC circuit 44 (the voltage across the smoothing capacitor C1) is referred to as a DC input voltage Vdc. The power supply unit 4 may be configured to input a DC voltage / DC current supplied from a storage battery or a solar battery to the buck converter 40.

  The buck converter 40 is a switching power supply circuit also referred to as a step-down chopper circuit, and a DC input voltage Vdc of several hundred volts supplied from the PFC circuit 44 is converted into a DC voltage (hereinafter referred to as tens of volts) required for the light source unit 1. It is configured to step down to an output voltage V1). The buck converter 40 is preferably composed of two switching elements Q21 and Q22, an inductor T1, a diode D4, a smoothing capacitor C3, and the like. The two switching elements Q21 and Q22 are electrically connected in parallel between the output terminal on the high potential side of the PFC circuit 44 and the positive electrode of the light source unit 1 via the inductor T1. The smoothing capacitor C3 is an electrolytic capacitor, and is electrically connected to the light source unit 1 in parallel. The diode D4 has a cathode electrically connected to a connection point between the parallel circuit of the switching elements Q21 and Q22 and the inductor T1, and an anode electrically connected to an output terminal (ground) on the low potential side of the PFC circuit 44. The The two switching elements Q11 and Q12 are semiconductor switching elements (for example, N-channel power MOSFETs) having common electrical characteristics. Further, it is preferable that the detection resistor R8 is electrically connected between the anode of the diode D4 and the low potential side terminal of the smoothing capacitor C3. However, the buck converter 40 has a conventionally well-known circuit configuration except that the two switching elements Q21 and Q22 are connected in parallel, and therefore detailed description of the operation is omitted.

  The first control power supply circuit 42 is configured to convert the DC input voltage Vdc of several hundred volts into a DC voltage of tens of volts (for example, 15 volts) (hereinafter referred to as the first control power supply voltage Vcc). The The first control power circuit 42 is preferably composed of a switching power circuit such as a buck converter or a flyback converter.

  Here, the power supply unit 4 of the present embodiment includes a bootstrap circuit that is conventionally known. The bootstrap circuit includes a bootstrap diode D2, a bootstrap capacitor C2, and a series circuit of a plurality of resistors R2 to R6 (hereinafter referred to as a resistor series circuit). In the bootstrap diode D2, the first control power supply voltage Vcc is applied to the anode, and one end of the bootstrap capacitor C2 is electrically connected to the cathode. The other end of the bootstrap capacitor C2 is electrically connected to the ground through a resistor series circuit. Further, resistors R3 to R6 are electrically connected in parallel with diode D4 of buck converter 40. The bootstrap circuit is configured to charge the bootstrap capacitor C2 with the first control power supply voltage Vcc during the off period of the switching elements Q21 and Q22 of the buck converter 40. When the bootstrap capacitor C2 is charged, the drive voltage HVcc of the switching elements Q21 and Q22 can be obtained from the high potential side terminal of the bootstrap capacitor C2.

  The second control power circuit 43 is preferably composed of a resistor R7, a diode D3, and a Zener diode ZD1. One end of the resistor R7 is electrically connected to the output terminal on the high potential side of the PFC circuit 44, and the other end of the resistor R7 is electrically connected to the cathode of the Zener diode ZD1 and the anode of the diode D3. The anode of the Zener diode ZD1 is electrically connected to the cathode of the diode D4 of the buck converter 40. The cathode of the diode D3 is electrically connected to the high potential side terminal of the bootstrap capacitor C2. However, the operation of the second control power supply circuit 43 will be described later.

  The control circuit 41 is configured to execute a first control operation for controlling the PFC circuit 44 and a second control operation for controlling the buck converter 40. In addition, it is preferable that such a control circuit 41 is comprised by the integrated circuit which has a circuit which performs 1st control operation, and a circuit which performs 2nd control operation, for example.

  In the first control operation, the control circuit 41 is preferably operated so as to maintain the DC input voltage Vdc at a desired target value (for example, a voltage of about 400 volts). That is, the control circuit 41 measures the DC input voltage Vdc by the resistance voltage dividing circuits R1 and R2, and adjusts the on-duty ratio of the PWM signal so that the DC input voltage Vdc matches the target value based on the measured value. It is preferable to do. This PWM signal is output to the PFC drive unit 48. The PFC drive unit 48 preferably drives the two switching elements Q11 and Q12 on and off simultaneously according to the PWM signal.

  In the second control operation, it is preferable to operate the control circuit 41 so that the current (load current) I1 flowing through the light source unit 1 matches the target value. That is, the control circuit 41 can measure the load current I1 from the voltage across the detection resistor R8, and adjust the on-duty ratio of the PWM signal so that the load current I1 matches the target value based on the measured value. preferable. The control circuit 41 may adjust the target value of the load current I1 in accordance with a control signal (dimming signal) given from the control unit 6 to dim or turn off the light source unit 1. Absent.

  Here, FIG. 4 shows a part of the circuit configuration (drive circuit) for executing the second control operation. The control circuit 41 (drive circuit) preferably includes a series circuit of two switching elements Q31 and Q32, a flip-flop circuit FF, a resistor R16, and a negation circuit (inverter) NOT. The two switching elements Q31 and Q32 are preferably both N-channel MOSFETs, and preferably have the same electrical characteristics. In one switching element Q31, the drive voltage HVcc is applied to the drain, and the source is electrically connected to the drain of the other switching element Q32. The other switching element Q32 has a source electrically connected to a ground terminal HGND having a high level. In the flip-flop circuit FF, a resistor R16 is inserted between the output terminal and the high-level ground terminal HGND, and a negation circuit NOT is inserted between the output terminal and the gate of the other switching element Q32. The gate of one switching element Q31 is electrically connected to the output terminal of the flip-flop circuit FF.

  When the output of the flip-flop circuit FF becomes high level, the high-side switching element Q31 is turned on and the low-side switching element Q32 is turned off. As a result, a drive signal having a voltage substantially equal to the drive voltage HVcc is output from the output terminal Ho of the control circuit 41. On the other hand, when the output of the flip-flop circuit FF becomes low level, the high-side switching element Q31 is turned off and the low-side switching element Q32 is turned on. As a result, the output terminal Ho of the control circuit 41 becomes almost the same potential as the high level ground terminal HGND, and the control circuit 41 stops outputting the drive signal from the output terminal Ho.

  Here, the drive signal of the control circuit 41 is given to the gates of the switching elements Q21 and Q22 via the speed-up circuit 47, respectively. Each speed-up circuit 47 is preferably composed of a PNP-type bipolar transistor Tr1, a diode D5, resistors R17 to R19, etc. (see FIG. 3). The resistor R17 is electrically connected between the gate and source of each switching element Q21, Q22. The emitter of bipolar transistor Tr1 is electrically connected to the gates of switching elements Q21 and Q22, and the collector of bipolar transistor Tr1 is electrically connected to the sources of switching elements Q21 and Q22 via resistor R18. The base of the bipolar transistor Tr1 is electrically connected to the anode of the diode D5 and one end of the resistor R19, and the other ends of the resistors R19 of each speed-up circuit 47 are electrically connected to the output terminal Ho of the control circuit 41. The

  In each speed-up circuit 47, when a high level drive signal is input from the output terminal Ho, the bipolar transistor Tr1 is turned off, and the drive voltage HVcc is applied between the gate and source of the switching elements Q21 and Q22 via the resistor R17. Apply to turn on. In addition, each speed-up circuit 47 turns on the bipolar transistor Tr1 when the drive signal from the output terminal Ho is stopped, and discharges the charges accumulated in the gates of the switching elements Q21 and Q22 to turn them off. That is, each speed-up circuit 47 is configured to speed up the turn-on of the switching elements Q21 and Q22 made of a power MOSFET.

  The control circuit 41 outputs a high-level drive signal from the output terminal Ho based on the voltage (detection voltage) induced in the detection winding T2 magnetically coupled to the inductor T1 in the second control operation. Is determined. For example, the control circuit 41 is preferably configured to detect a zero cross of a current (inductor current) flowing through the inductor T1 based on the detection voltage and output a drive signal in synchronization with the zero cross.

  The signal conversion circuit 49 is preferably configured to convert a control signal (PWM signal) supplied from the control unit 6 into a direct-current voltage signal and output it to the control circuit 41. The signal level (DC voltage level) of the voltage signal output from the signal conversion circuit 49 corresponds to the output level (dimming level) indicated by the control signal. The control circuit 41 preferably adjusts the target value to a value corresponding to the signal level (dimming level) of the voltage signal output from the signal conversion circuit 49.

  By the way, it is preferable that the power supply unit 4 of this embodiment is provided with a timer circuit. As shown in FIG. 3, the timer circuit is preferably composed of a CR integrating circuit of resistors R13 to R15 and a capacitor C4. This timer circuit is configured by connecting a series circuit of resistors R13 to R15 electrically in parallel with a smoothing capacitor C3 and a detection resistor R8, and electrically connecting a low-side resistor R15 and a capacitor C4 in parallel. Since the voltage across the capacitor C4 gradually increases from the time when the AC power supply AC is turned on, the control circuit 41 determines the elapsed time from the time when the capacitor C4 is turned on based on the voltage across the capacitor C4 (hereinafter referred to as a timer signal). Can know. Note that a series circuit of resistors R9 to R12 is preferably electrically connected in parallel to the timer circuit.

  Next, the basic operation of the power supply unit 4 of the present embodiment will be described with reference to the waveform diagrams of FIGS. 5 and 6 show waveform diagrams of the DC input voltage Vdc, the output voltage V1, the drive voltage HVcc, and the load current I1, respectively.

  First, as shown in FIG. 5, when the AC power supply AC is turned on at time t = t1, the first control power supply circuit 42 is activated to generate the first control power supply voltage Vcc. When the first control power supply voltage Vcc reaches a rated value (for example, 15 volts) (time t = t2), the control circuit 41 is activated to execute the first control operation. Note that the control circuit 41 preferably monitors the elapsed time from the time t = t1 based on the timer signal.

  When the control circuit 41 executes the first control operation, the PFC circuit 44 operates and the DC input voltage Vdc reaches the rated value (time t = t3). When the first control power supply voltage Vcc reaches the rated value, the bootstrap circuit operates normally and a predetermined drive voltage HVcc is applied to the control circuit 41.

  If the control circuit 41 determines that a predetermined time (hereinafter referred to as a preparation period) has elapsed since the DC input voltage Vdc reached the rated value based on the timer signal (time t = t4), the second control operation is performed. To start. When the control circuit 41 starts the second control operation, the output voltage V1 of the buck converter 40 gradually increases, and the load current I1 starts to flow from the time when the lighting start voltage of the light source unit 1 is exceeded (time t = t5). Then, the control circuit 41 controls (feedback control) the buck converter 40 so that the load current I1 is a constant value. Therefore, the power supply unit 4 of this embodiment can light the light source unit 1 with desired brightness (light output).

  Here, as shown in FIG. 5, it is assumed that an instantaneous power failure occurs in the AC power supply AC at time t = t6. When an instantaneous power failure occurs in the AC power supply AC, the switching elements Q11 and Q12 of the PFC circuit 44 are turned off, and the DC input voltage Vdc is slightly lower than the rated value while the charge accumulated in the smoothing capacitor C1 is being discharged. A low voltage is maintained (see FIG. 5). Therefore, the first control power supply circuit 42 can continue to operate and continue to supply the first control power supply voltage Vcc. However, when the DC input voltage Vdc falls below the rated value, the output voltage V1 of the buck converter 40 falls below the lighting start voltage, so the light source unit 1 is turned off and the load current I1 does not flow. When the PFC circuit 44 is restarted, the DC input voltage Vdc returns to the rated value (time t = t7).

  However, at the time of restart after an instantaneous power failure occurs, in a state where the charge charge remains in the smoothing capacitor C3 of the buck converter 40, the potential of the high level ground terminal HGND is higher than the first control power supply voltage Vcc. Will be maintained. As a result, the charging current does not flow from the first control power supply circuit 42 to the bootstrap capacitor C2, and the driving voltage HVcc does not rise to a necessary level, so that the switching elements Q21 and Q22 of the buck converter 40 are not turned on (FIG. 6). reference).

  Therefore, in the power supply unit 4 of the present embodiment, the second control power supply circuit 43 generates the drive voltage HVcc only when the bootstrap circuit cannot operate normally (the drive voltage HVcc does not rise to a necessary level). Is configured to do. That is, since the DC input voltage Vdc (≈the peak value of the power supply voltage of the AC power supply AC) exceeds the output voltage V1 of the buck converter 40 during the period of time t = t6 to t7, the second control power supply circuit 43 operates. The bootstrap capacitor C2 is charged. As a result, as shown in FIG. 5, the power supply unit 4 of the present embodiment can change the drive voltage HVcc to the switching elements Q21 and Q22 while the PFC circuit 44 is stopped (time t = t6 to t7). The level required for driving can be maintained. However, the second control power supply circuit 43 causes the charging current to flow through the bootstrap capacitor C2 and the resistor series circuit, so that the rate of decrease in the DC input voltage Vdc increases as compared with the case where the second control power supply circuit 43 does not exist. Therefore, if the DC input voltage Vdc falls below the output voltage V1 of the buck converter 40 before the PFC circuit 44 restarts and the DC input voltage Vdc exceeds the lighting start voltage, there is a possibility that the buck converter 40 cannot be started. is there. Therefore, the second control power supply circuit 43 must raise the drive voltage HVcc to a necessary voltage within the time from the operation start time of the PFC circuit 44 to the operation start time of the buck converter 40 (time t = t7 to t8). Don't be. In the power supply unit 4 of the present embodiment, the second control power supply circuit 43 requires the drive voltage HVcc by appropriately setting a time constant determined by the combined resistance value of the resistor series circuit and the electrostatic capacitance of the bootstrap capacitor C2. The voltage can be increased up to a certain voltage.

  The control circuit 41 of the power supply unit 4 sets the output of the buck converter 40 as a lower limit value when the signal level of the voltage signal output from the signal conversion circuit 49 is the maximum value, and the buck converter 40 when the signal level is the minimum value. It is preferable to make the output of the rated value. In principle, the control circuit 41 preferably sets the output of the buck converter 40 to a rated value when the signal level is zero. However, immediately after the AC power supply AC is turned on, the output voltage of the PFC circuit 44 does not reach the rated voltage, so the output voltage of the buck converter 40 is not stable. Therefore, it is preferable that the control circuit 41 does not accept the control signal and stops the buck converter 40 during the period from when the AC power supply AC is turned on until the preparation period elapses. That is, since the power supply from the power supply unit 4 is not performed during the preparation period, the light source unit 1 is maintained in the off state. If the output voltage of the PFC circuit 44 is stabilized after the preparatory period has elapsed, the control circuit 41 operates the buck converter 40 to supply the light source unit 1 with DC power having an output level corresponding to the control signal. As a result, the light source unit 1 is lit at the dimming level indicated by the control signal.

  As described above, the lighting device 8 of the present embodiment is configured to output a control signal from one control unit 6 to two power supply units 4 in common. Therefore, as compared with the case where a plurality of control units individually output control signals to the power supply unit, the lighting device 8 of the present embodiment has a timing at which the plurality of power supply units 4 blink and dim each light source unit 1 ( Variation in control timing) can be suppressed. The lighting device 8 of the present embodiment supplies power (first control power supply voltage Vcc) from one power supply unit 4 (first power supply unit 4A) of the plurality of power supply units 4 to the control unit 6. It is configured. Therefore, the circuit configuration of the control unit 6 can be simplified as compared with the case where the control unit 6 generates an operating power supply from the AC power supply AC.

  As described above, the lighting device 8 of the present embodiment is a lighting device that lights a plurality of light source units 1 each having a solid light emitting element (light emitting diode). The lighting device 8 of the present embodiment converts a power supplied from an external power supply (AC power supply AC) into a plurality of power supply units 4 that individually supply power to the light source unit 1 and a power supplied to the light source unit 1. And a control unit 6 for controlling the power supply unit 4 to adjust. The plurality of power supply units 4 include a switching power supply circuit (buck converter 40), a control circuit 41 that controls the operation of the switching power supply circuit, and a control power supply circuit that generates a power supply for operating the control circuit 41 (first control power supply circuit). 42). The control unit 6 has a control unit 60. The control unit 60 generates a control signal indicating the output level of the switching power supply circuit, and applies the generated control signal to the control circuits 41 of the plurality of power supply units 4 in common. The control unit 6 is configured to operate the control unit 60 with a power supply (first control power supply voltage Vcc) generated by the control power supply circuit (first control power supply circuit 42) of any one power supply unit 4A. The control circuits 41 of the plurality of power supply units 4 control the operation of the switching power supply circuit (back converter 40), and the output power of the switching power supply circuit (back converter 40) corresponds to the output level indicated by the control signal. Configured to match the value.

  Since the lighting device 8 of the present embodiment is configured as described above, it is possible to suppress variations in control timing of the plurality of light source units 1.

  By the way, the allowable error of the electrolytic capacitor used for the smoothing capacitor C1 of the PFC circuit 44 increases as the capacitance increases (for example, ± 20%). The time required for the output voltage of the PFC circuit 44 to become stable after the AC power source AC is turned on is greatly affected by the capacitance of the smoothing capacitor C1, and thus varies for each power supply unit 4. When the variation in the time for each power supply unit 4 becomes large, the variation in the lighting timing of each light source unit 1 that is turned on by each power supply unit 4 may become large.

  Therefore, in the lighting device 8 of the present embodiment, it is preferable that the control unit 60 of the control unit 6 stores the longest preparation period (data) of the preparation periods for each power supply unit 4 in the memory in advance. .

  Next, operation | movement of the lighting device 8 of this embodiment is demonstrated in detail with reference to the time chart of FIG. 7A-FIG. 7C. In the following description, it is assumed that the preparation period T2 of the other power supply unit 4 (hereinafter referred to as the second power supply unit 4B) is longer (T1 <T2) than the preparation period T1 of the first power supply unit 4A. . 7A shows a time chart when the control circuit 41 of the first power supply unit 4A increases or decreases the output level of the buck converter 40, and FIG. 7B shows the output level of the buck converter 40 by the control circuit 41 of the second power supply unit 4B. The time chart when increasing / decreasing is shown. FIG. 7C shows a time chart when the control unit 60 of the control unit 6 generates a control signal. 7A and 7B, the vertical axis indicates the output level (ratio when the rated output is 100%), and the vertical axis in FIG. 7C indicates the duty ratio of the control signal. Moreover, the horizontal axis of FIG. 7A-FIG. 7C shows the time t.

  When the AC power supply AC is turned on at time t = t0, the first control power supply circuit 42 of each power supply unit 4A, 4B starts its operation. The first control power supply circuit 42 can supply the first control power supply voltage Vcc after time t = t1. When the first control power supply voltage Vcc starts to be supplied, the PFC circuit 44, the control circuit 41, and the control unit 6 start operating in the power supply units 4A and 4B. The control unit 60 of the control unit 6 counts (measures) the elapsed time from time t = t1 and generates a PWM signal (control signal) with a duty ratio of 100%. Output to units 4A and 4B.

  On the other hand, when time t = t1, the control circuit 41 of each power supply unit 4A, 4B starts a countdown (time limit) corresponding to the preparation periods T1, T2. However, “time corresponding to the preparation periods T1 and T2” means a time obtained by subtracting the times t0 to t1 until the operation of the first control power supply circuit 42 is stabilized from the preparation periods T1 and T2. Further, the control circuit 41 of each power supply unit 4A, 4B does not accept the control signal transmitted from the control unit 6 and does not operate the back converter 40 while counting down the time corresponding to the preparation periods T1, T2. . Therefore, the light source unit 1 remains off.

  When the elapsed time reaches a time corresponding to the preparation period T2 (time t = t3), the control unit 60 generates a PWM signal (control signal) with a duty ratio of 15% and outputs it to the power supply units 4A and 4B. To do. However, the value of the duty ratio at this time is determined by the control unit 60 according to the initial illumination correction characteristic.

  When the count down of the time corresponding to the preparation period T2 ends (time t = t3), the control circuit 41 of the power supply units 4A and 4B indicates from the signal level of the voltage signal (control signal) converted by the signal conversion circuit 49. Determine the output level (dimming level). That is, since the duty ratio is 15%, the control circuit 41 determines that the output level (dimming level) is 80% and sets the back converter 40 so that the load current I1 is 80% of the rated value. Control. However, the control unit 60 of the control unit 6 does not change the duty ratio from 100% to 15% at a constant rate (for example, 10% per second) from time t = t3 to time t = t4. It is preferable to generate a PWM signal. As a result, the control circuit 41 of each power supply unit 4 causes the buck converter 40 to increase the output level from zero to 80% at a constant rate (for example, 10% per second) as shown in FIGS. 7A and 7B. It is preferable to control. Thus, if the light quantity of the several light source unit 1 increases gradually, it can make it difficult to make a person in an illumination space feel uncomfortable.

  Here, consider a case where a control signal is not output from the control unit 6 to the first power supply unit 4A. In this case, the control circuit 41 of the first power supply unit 4A determines that the back converter 40 at time t = t2, that is, when the elapsed time from time t = t0 reaches the preparation period T1 of the first power supply unit 4A. Is operated, and the light source unit 1 is lit at a rated level.

  However, in the lighting device 8 of the present embodiment, the control circuit 41 of the first power supply unit 4A is instructed to set the output level to zero by the control signal from time t = t2 to t = t3. For this reason, the light source unit 1 that is electrically connected to the first power supply unit 4A is also kept off until time t = t3.

  Therefore, even in the lighting device 8 in which a plurality of power supply units 4A and 4B having different preparation periods are mixed, all the light source units 1 are obtained when a predetermined time (preparation period T2) elapses from when the AC power supply AC is turned on. Can be turned on simultaneously. That is, the lighting device 8 of the present embodiment can suppress variations in lighting timing of the plurality of light sources (light source units 1).

  As described above, in the lighting device 8 of the present embodiment, the control unit 60 outputs the output of zero or a value close to zero until a predetermined standby time (preparation period) elapses when the external power is turned on. Preferably, the control signal indicating the level is generated. Moreover, it is preferable that the control part 60 is comprised so that the said control signal may be given to the several power supply unit 4 in common. Furthermore, it is preferable that the control unit 60 is configured to generate the control signal indicating the predetermined output level that is not zero and to provide the same to the plurality of power supply units 4 after the standby time has elapsed. The standby time is preferably set to a time equal to or longer than the maximum value of the time required for starting up the plurality of power supply units 4 (preparation periods T1, T2).

  If the lighting device 8 of the present embodiment is configured as described above, it is possible to reduce variations in rising of the outputs of the plurality of power supply units 4 and to suppress variations in lighting timing of the plurality of light source units 1.

  Incidentally, the first control power supply circuit 42 generates the first control power supply voltage Vcc from the output voltage (DC input voltage Vdc) of the PFC circuit 44. Therefore, even if the AC power supply AC is shut off, the first control power supply circuit 42 continues to operate until the charge of the smoothing capacitor C1 is discharged and the DC input voltage Vdc falls below the operable lower limit value. When the supply of the AC power supply AC is resumed while the first control power supply circuit 42 continues to operate, the control unit 60 of the control unit 6 does not reset the power supply. (For example, a fade-in function) cannot be realized. For this reason, the control circuit 41 of each power supply unit 4 sequentially restarts the first control operation and the second control operation, respectively, so that it is not possible to suppress variations in lighting timing of the plurality of light source units 1.

  Therefore, the control circuit 41 of the first power supply unit 4A is configured to stop the power supply from the first control power supply circuit 42 to the control unit 6 when detecting that the power supply of the AC power supply AC is stopped. Is preferred. For example, it is preferable that the control circuit 41 monitors the currents of the switching elements Q11 and Q12 of the PFC circuit 44 and determines that the power supply of the AC power supply AC is stopped when it is detected that the currents do not flow. (See FIG. 3). Further, the control circuit 41 turns off the relay (electromagnetic relay or semiconductor relay) inserted into the power supply path from the first control power circuit 42 to the control unit 6 (the power supply unit 63 thereof), for example. It is preferable to stop the power supply from the circuit 42 to the control unit 6.

  In the lighting device 8 of the present embodiment, when the control circuit 41 detects that the power supply of the external power supply (AC power supply AC) has stopped, the control unit 41 controls the control unit 6 from the control power supply circuit (first control power supply circuit 42). Preferably, the power supply to 60 is stopped.

  If the lighting device 8 of the present embodiment is configured as described above, the control unit 60 of the control unit 6 is always reset when the power supply of the AC power supply AC is stopped. The possibility of performing can be reduced.

  Next, the structure of the lighting device 8 and the embodiment of the lighting fixture according to the present invention will be described in detail with reference to FIGS. In the present embodiment, a projector is exemplified as the lighting fixture. However, the lighting fixture to which the technical idea of the present invention can be applied is not limited to the projector, and for example, a lighting fixture for a high ceiling or a road lamp may be used.

  As shown in FIGS. 8 and 9, the lighting fixture of the present embodiment includes a plurality (four in the illustrated example) of light source units 1 and a lighting device 8. Furthermore, the lighting fixture of the present embodiment preferably includes a connecting member that connects the plurality of light source units 1 and the arm 16. However, the number of light source units 1 constituting the lighting fixture is not limited to four, and may be one to three, or five or more. In the following description, unless otherwise specified, the vertical, horizontal, and front-rear directions are defined in FIG. 8 and the front side of the page is the front.

  As shown in FIG. 9, the light source unit 1 includes an LED module corresponding to a light source and a heat radiating member 3. The LED module preferably includes a plurality of light emitting diodes (LEDs) and a mounting substrate. The LED is, for example, a conventionally known package type white LED. The mounting substrate is preferably composed of a rectangular flat plate-like aluminum substrate. The LEDs are mounted side by side vertically and horizontally on the front surface of the mounting substrate. A receptacle connector is mounted on the front surface of the mounting board. The receptacle connector is electrically connected to the electrodes (cathode and anode) of each LED via a wiring conductor formed on the front surface of the mounting substrate.

  As shown in FIG. 9, the heat radiating member 3 is preferably composed of a base portion 30, a pair of edge portions 31, and a plurality of heat radiating plates 32. In addition, it is preferable that the base part 30, the edge part 31, and the heat sink 32 are formed with the material excellent in thermal conductivity, such as aluminum alloy, for example. The base part 30 is formed in a rectangular flat plate shape. The LED module is fixed to the front surface of the base unit 30. Further, the cover 7 is attached to the front surface of the base portion 30 so as to cover the LED module (see FIG. 8). The cover 7 is formed in a flat rectangular box shape using a synthetic resin material having translucency such as polycarbonate resin. The pair of edge portions 31 have a rectangular parallelepiped shape whose longitudinal direction is the vertical direction, and are formed integrally with the base portion 30 at the left end edge and the right end edge of the base portion 30. In addition, the thickness (width in the front-rear direction) of the edge portion 31 is formed sufficiently larger than the thickness of the base portion 30.

  As shown in FIGS. 8 and 9, the connecting member preferably includes a first connecting member 10, a second connecting member 11, a third connecting member 12, and an auxiliary connecting member.

  The first connecting member 10 includes a strip-shaped main piece 100 and an auxiliary piece 101 that protrudes in the thickness direction of the main piece 100 along the longitudinal direction of the main piece 100. The main piece 100 and the auxiliary piece 101 are integrally formed by bending a metal plate such as a stainless steel plate along the longitudinal direction.

  The first connecting member 10 is provided with projecting pieces 102 and 103 at both ends and the center in the longitudinal direction of the main piece 100, respectively. However, the central projecting piece 103 has a length dimension almost twice that of the projecting pieces 102 at both ends. Further, the tip of the central projecting piece 103 is bent outward. Each protrusion 102, 103 is provided with one or two screw insertion holes (see FIGS. 8 and 9).

  As shown in FIG. 9, the first connecting member 10 is attached to the two light source units 1 by screwing the projecting pieces 102 and 103 to the edge 31 of the heat radiating member 3. That is, the screw 104 inserted into the screw insertion hole of each of the projecting pieces 102 and 103 is screwed into the screw hole of the edge portion 31.

  The 2nd connection member 11 is comprised with a strip | belt-shaped metal plate (for example, stainless steel plate etc.). However, the central portion 110 of the second connecting member 11 protrudes in the thickness direction with respect to the end portions 111 on both sides. The central portion 110 is provided with three screw insertion holes. On the other hand, each end portion 111 is provided with two screw insertion holes (see FIG. 9).

  The second connecting member 11 is attached to the two light source units 1 by being screwed to the edge 31 of the heat radiating member 3. That is, the screw 112 inserted into the screw insertion hole of the center part 110 and each end part 111 is screwed into the screw hole of the edge part 31.

  The 3rd connection member 12 is comprised with a strip | belt-shaped metal plate (for example, stainless steel plate etc.). However, the third connecting member 12 is reinforced by bending both end portions along the longitudinal direction in the thickness direction. The third connecting member 12 is provided with two screw insertion holes at both ends in the longitudinal direction. These screw insertion holes are provided so as to be aligned in the short direction of the third connecting member 12. The 3rd connection member 12 is attached to the four light source units 1 by screwing to the edge part 31 of the thermal radiation member 3 (refer FIG. 8).

  As shown in FIGS. 8 and 9, the auxiliary connecting member includes a pair of arm attachment members 13 and a pair of reinforcing members 14. The arm attachment member 13 includes a square hook-shaped fixing part 130, a pair of attachment parts 131, and a bearing part 132. In addition, it is preferable that the fixing | fixed part 130, the attaching part 131, and the bearing part 132 are integrally formed by aluminum die casting, for example.

  The pair of attachment portions 131 are formed in a long truncated cone shape and protrude rearward from the fixed portion 130. A female thread is formed at the tip of each mounting portion 131.

  The bearing portion 132 is formed in a cylindrical shape, is disposed between the pair of attachment portions 131, and is connected to each attachment portion 131 and the fixing portion 130. A screw hole is provided at the center of the bearing portion 132.

  As shown in FIG. 9, the reinforcing member 14 is formed of a band-shaped metal plate (for example, a stainless steel plate). However, the reinforcing member 14 is reinforced by bending both end portions along the longitudinal direction in the thickness direction. The pair of reinforcement members 14 are attached to the attachment portions 131 of the arm attachment members 13 on the left and right sides so as to be aligned in the vertical direction. That is, the bolt 140 is inserted into the screw insertion holes provided at both ends of the reinforcing member 14, and the bolt 140 is screwed into the female screw at the distal end portion of the attachment portion 131 (see FIG. 9).

  As shown in FIG. 9, the arm 16 includes a fixed plate 160, a pair of rising pieces 161 that rise obliquely upward from the left and right ends of the fixed plate 160, and a support piece 162 that rises diagonally upward from the tip of each rising piece 161. Are integrally formed of a metal plate.

  In the fixing plate 160, a circular fixing hole 1601 passes through substantially the center, and a semicircular arc-shaped long hole 1600 centering on the fixing hole 1601 passes behind the fixing hole 1601 (see FIG. 9). Then, the fixing plate 160 is fixed to an illumination stand (concrete base) or the like by a bolt inserted through the fixing hole 1601 and a bolt inserted through the long hole 1600. Further, by loosening the bolt inserted through the long hole 1600, the direction of the arm 16 (the direction of the light source unit 1) can be changed within a range of about 180 degrees.

  Each support piece 162 has a circular insertion hole passing through the tip. Therefore, the bolt 163 inserted through the insertion hole is screwed into the screw hole of the bearing portion 132 of the arm attachment member 13, so that the four light source units 1 connected by the connection member can be rotatably supported by the arm 16. it can.

  By the way, the wiring box 15 is attached to the lower reinforcing member 14 by screwing (see FIG. 9).

  The wiring box 15 is formed in a rectangular box shape by a metal material. A relay terminal block is accommodated in the wiring box 15. This terminal block is configured to electrically connect a power cable for supplying AC power from the power system and a power cable 9 for supplying AC power to the lighting device 8.

  As shown in FIGS. 10A and 10B, the lighting device 8 includes a case 81 that houses two power supply units 4A and 4B. However, in the following description of the lighting device 8, in FIG. 11, the vertical and horizontal directions and the front and rear directions are defined.

  As shown in FIGS. 10B, 11, and 12, each of the power supply units 4 </ b> A and 4 </ b> B has a large number of circuits constituting each circuit such as the PFC circuit 44, the back converter 40, and the control circuit 41 on the surface of the printed wiring board 800. An element (circuit component) 801 is mounted. Each power supply unit 4A, 4B preferably has an output cable provided with a plug connector at the tip. These output cables are preferably drawn out of the case 81 and electrically connected to the receptacle connector of the light source unit 1 directly or via another electric cable. However, in each power supply unit 4A, 4B, it is preferable that a circuit element (for example, a semiconductor switching element for switching power supply) 801B constituting the first control power supply circuit 42 is mounted on the back surface of the printed wiring board 800 ( (See FIG. 10B).

  Furthermore, each power supply unit 4 </ b> A, 4 </ b> B has a wall portion 802 that rises from an end portion on one side of the printed wiring board 800. The wall portion 802 is formed in a rectangular flat plate shape from a material that is a good heat conductor (for example, aluminum or aluminum alloy). Moreover, it is preferable that the wall part 802 is provided with a pair of L-shaped leg 8020 which protrudes from the front end and rear end in one edge along a longitudinal direction (refer FIG. 10B). The wall portion 802 stands up along the normal direction (vertical direction) of the surface by attaching the pair of legs 8020 to the surface of the printed wiring board 800 (surface on which the circuit element 801 is mounted). It is preferable to be provided. Moreover, it is preferable that the wall part 802 is provided so that the several screw hole 8021 penetrated in the thickness direction may be located in a line with a longitudinal direction (refer FIG. 11). Furthermore, the wall portion 802 is a semiconductor element (for example, a power MOSFET) used for the full-wave rectifier 46, the switching elements Q11, Q12, Q21, Q22, etc., among the circuit elements 801 mounted on the surface of the printed wiring board 800. Thermally coupled to 801A. In addition, these semiconductor elements 801A usually have a radiator (heat sink). Then, the screw 803 inserted into the screw insertion hole provided in the radiator is screwed into the screw hole 8022 provided in the wall portion 802, so that the semiconductor element 801A and the wall portion 802 are thermally coupled (FIG. 10B). And FIG. 11).

  The case 81 preferably includes a case body 82 and two lids 83 and 84 (see FIG. 9). The case main body 82 is preferably formed in a rectangular tube shape with both ends in the axial direction opened by, for example, extrusion molding of aluminum or an aluminum alloy. Further, the case body 82 is preferably formed with grooves 85 on the upper and lower inner surfaces of the left side wall 820, respectively. Furthermore, it is preferable that the case main body 82 is also formed with a groove 85 on each of the upper and lower inner surfaces of the right side wall 821 (see FIGS. 10B and 11). These groove portions 85 are preferably configured so as to be straight and parallel to each other from one opening end of the case main body 82 to the other opening end. The width of the groove 85 may be a dimension that is slightly larger than the thickness of the printed wiring board 800.

  Further, four cable insertion holes pass through the rear end portion of the lower side wall 823 of the case main body 82. The output cables are respectively inserted into these four cable insertion holes, and the output cables are fixed to the side wall 823 by the stoppers.

  The lid portions 83 and 84 are preferably formed in a flat plate shape by aluminum die casting, for example. These two lid portions 83 and 84 are preferably configured so as to close the openings at both ends of the case main body 82 by being screwed to the end portions in the axial direction of the case main body 82 (see FIG. 9). ). However, it is preferable that waterproof packing is sandwiched between the lids 83 and 84 and the end of the case body 82 to prevent rainwater from entering the case body 82. Moreover, the cable insertion hole has penetrated the center of the cover part 84 of one side (front). Then, the power cable 9 is inserted into the cable insertion hole, and the power cable 9 is fixed to the lid portion 84 with a stopper.

  As shown in FIG. 9, the lighting device 8 is preferably such that the side wall 823 of the case main body 82 is screwed to the pair of reinforcing members 14. At this time, it is preferable that the lighting device 8 is fixed to the reinforcing member 14 in such a posture that the lid portion 84 to which the power cable 9 is fixed is down and the other lid portion 83 is up.

  Next, the assembly work of the lighting device 8 of this embodiment will be described. First, the operator inserts output cables into the four cable insertion holes of the side wall 823, and electrically connects two output cables to the output terminals of the two power supply units 4A and 4B, respectively. Note that the electrical connection between the output terminal and the output cable is preferably a connection method using a connector. However, in addition to the connection method using a connector, a connection method using a terminal block or a connection method using soldering may be used.

  Subsequently, the operator inserts both ends of the printed wiring board 800 of one of the power supply units 4A and 4B into the groove 85 on the lower side of the left and right side walls 820 and 821 from the opening on one side of the case body 82 ( (See FIG. 11). Similarly, the operator inserts both end portions of the printed wiring board 800 of the other power supply unit 4A, 4B into the upper groove portions 85 of the left and right side walls 820, 821 from the opening on one side of the case body 82. At this time, the wall portion 802 of one power supply unit 4A, 4B is close to the right side wall 821, and the wall portion 802 of the other power supply unit 4A, 4B is close to the left side wall 820. The first power supply unit 4A is preferably disposed on the upper side in the case body 82, and the second power supply unit 4B is preferably disposed on the lower side in the case body 82.

  The operator inserts screws 88 from the outside of the case main body 82 into a plurality of through holes provided in the left and right side walls 820 and 821, and screws these screws 88 into the screw holes 8021 of the wall portion 802. That is, in the lighting device 8 of the present embodiment, the wall portion 802 of each power supply unit 4A, 4B is screwed to the side wall 820, 821 of the case body 82 and mechanically and thermally coupled (FIGS. 10B and 12). reference).

  Subsequently, the operator houses the control unit 6 in the case main body 82 and screws it to the lower side wall 823. In addition, the worker electrically connects the control signal output unit 62 of the control unit 6 and the signal conversion circuits 49 of the two power supply units 4A and 4B with electric wires. Further, the worker electrically connects the output end of the first control power circuit 42 of the first power supply unit 4A and the power supply unit 63 of the control unit 6 with electric wires.

  Subsequently, the worker electrically connects the power cable 9 inserted into the cable insertion hole of the lid portion 84 to the input terminal of each power supply unit 4A, 4B. Then, the operator screws the two lid portions 83 and 84 to the front end and the rear end of the case main body 82. Finally, the operator secures the output cable to the case body 82 by screwing the fastener to the side wall 823, and also fixes the power cable 9 to the case body 82 by screwing the fastener to the lid portion 84. In this way, the assembly operation of the lighting device 8 is completed.

  As described above, the lighting device 8 of the present embodiment inserts the end portion of the printed wiring board 800 into the groove portion 85 provided in the case main body 82 so that the case main body 82 supports the power supply units 4A and 4B. . Furthermore, in the lighting device 8 of the present embodiment, specific circuit elements (semiconductor elements 801A) of the power supply units 4A and 4B are thermally coupled to the case main body 82 via the wall portion 802. Therefore, heat generated in the semiconductor element 801 </ b> A is transmitted to the case main body 82 via the wall portion 802 and is radiated through the case main body 82. Therefore, the lighting device 8 of the present embodiment can be reduced in size and weight by eliminating the need for housing the power supply units 4A, 4B, and the heat of the semiconductor element 801A via the wall portion 802. The heat dissipation can be improved by transmitting to the case main body 82.

  Moreover, when the lighting device 8 includes two power supply units 4A and 4B as in the present embodiment, the wall portion 802 of each power supply unit 4A and 4B is out of the plurality of side walls 820 to 823 of the case body 82. It is preferably thermally coupled to two different side walls 820, 821. That is, in the lighting device 8 of the present embodiment, the heat of the semiconductor element 801A is compared with the case where the wall portions 802 of the two power supply units 4A and 4B are thermally coupled to the same side wall (for example, the side wall 820). Can be efficiently radiated from the case main body 82.

  Further, in the lighting device 8 of the present embodiment, the control unit 6 feeds power from the first power supply unit 4A having the larger distance from the light source unit 1 (the heat dissipating member 3) of the two power supply units 4A and 4B. It is preferable (refer FIG. 10B). That is, the closer the distance to the light source unit 1 (the heat dissipating member 3) is, the more easily affected by the heat radiated from the light source unit 1 (the heat dissipating member 3). Therefore, the first control power supply circuit 42 is affected by the heat from the light source unit 1 by supplying power to the control unit 6 from the first power supply unit 4A having the larger distance from the light source unit 1 (the heat radiating member 3). This makes it difficult to secure the thermal margin of the first control power supply circuit 42.

  As described above, in the lighting device 8 of the present embodiment, the plurality of power supply units 4A and 4B are preferably configured such that the distance from the light source unit 1 is different. The control unit 60 is preferably configured to be supplied with power for operation from the control power supply circuit (first control power supply circuit 42) of the power supply unit 4A having the longest distance.

  If the lighting device 8 of the present embodiment is configured as described above, the control power supply circuit (first control power supply circuit 42) can be hardly affected by the heat of the light source unit 1.

  Here, in the power supply unit 4, the circuit elements 801 and 801 </ b> A constituting the back converter 40 are mounted on the surface of the printed wiring board 800, and the circuit element 801 </ b> B constituting the first control power supply circuit 42 is the back surface of the printed wiring board 800. It is preferable to be mounted on. That is, heat generated in the circuit element 801 is hardly transmitted to the circuit element 801B constituting the first control power circuit 42 by the insulating substrate (glass cloth base epoxy resin substrate or the like) constituting the printed wiring board 800.

  As described above, in the lighting device 8 of the present embodiment, the control power supply circuit (first control power supply circuit 42) preferably includes a semiconductor switching element that constitutes a switching power supply (a buck converter or a flyback converter). The power supply unit 4 preferably includes a heat insulating portion (printed wiring board 800) that makes it difficult for heat generated in the switching power supply circuit (buck converter 40) to be conducted to the semiconductor switching element.

  If the lighting device 8 of the present embodiment is configured as described above, the control power supply circuit (first control power supply circuit 42) can be hardly affected by the heat of the switching power supply circuit (back converter 40).

  By the way, when the lighting fixture of this embodiment is installed in a lighting stand, it is preferable that the both ends of the metal wires 17 are screwed to the center part 110 of the 2nd connection member 11, respectively (refer FIG. 9). Furthermore, it is preferable that the wire 17 is supported by a wire receiver 18 fixed to the illumination table (see FIG. 9). In other words, when the arm 16 is detached from the illumination table, the wire 17 supports the fall of the lighting fixture.

  As described above, the lighting fixture of the present embodiment includes the lighting device 8 and the plurality of light source units 1 that are turned on by the lighting device 8.

  According to the lighting fixture of this embodiment, the dispersion | variation in the control timing of the several light source unit 1 can be suppressed.

  The lighting fixture of the present embodiment preferably includes a support member (arm 16) that supports the plurality of light source units 1 and the lighting device 8 in a displaceable manner.

  If the lighting fixture of this embodiment is comprised as mentioned above, the irradiation direction of the light of the light source unit 1 can be changed, and the usability can be improved.

  Moreover, in the lighting fixture of this embodiment, it is preferable that the light source unit 1 has a light emitting diode or an organic electroluminescent element as a solid light emitting element.

DESCRIPTION OF SYMBOLS 1 Light source unit 4 Power supply unit 6 Control unit 8 Lighting device 16 Arm (support member)
40 Buck converter (switching power supply circuit)
41 control circuit 42 first control power circuit (control power circuit)
60 Control part 800 Printed wiring board (heat insulation part)

Claims (8)

A lighting device for lighting a plurality of light source units having a solid state light emitting element,
A plurality of power supply units that convert electric power supplied from an external power source and separately supply power to the light source unit, and a control unit that controls the power supply unit so as to adjust the power supplied to the light source unit. ,
The plurality of power supply units each include a switching power supply circuit, a control circuit that controls the operation of the switching power supply circuit, and a control power supply circuit that generates a power supply for operating the control circuit,
The control unit includes a control unit that generates a control signal instructing an output level of the switching power supply circuit, and applies the generated control signal to the control circuits of the plurality of power supply units in common. The control unit is configured to operate with a power source generated by the control power circuit of the two power source units,
The control circuit of the plurality of power supply units is configured to control the operation of the switching power supply circuit so that the output power of the switching power supply circuit matches a value corresponding to the output level indicated by the control signal The lighting device characterized by being made. The control unit generates the control signal indicating the output level of zero or a value close to zero until a predetermined standby time elapses when the external power is turned on, and a plurality of the power supply units And the control signal indicating the predetermined output level that is not zero is generated and given to the plurality of power supply units in common after the standby time has elapsed,
2. The lighting device according to claim 1, wherein the standby time is set to a time that is equal to or greater than a maximum value of time required for starting the plurality of power supply units.   The said control circuit is comprised so that the power supply from the said control power supply circuit to the said control part of the said control unit may be stopped if it detects that the electric power supply of the said external power supply stopped. The lighting device according to 1 or 2. The plurality of power supply units are configured to have different distances from the light source unit,
The said control part is comprised so that the electric power for operation | movement may be supplied from the said control power supply circuit of the said power supply unit with the said largest distance, The any one of Claims 1-3 characterized by the above-mentioned. Lighting device. The control power supply circuit has a semiconductor switching element constituting a switching power supply,
The lighting device according to claim 4, wherein the power supply unit includes a heat insulating portion that makes it difficult for the heat generated in the switching power supply circuit to be conducted to the semiconductor switching element.   A lighting fixture comprising: the lighting device according to claim 1, and a plurality of the light source units that are turned on by the lighting device.   The lighting fixture according to claim 6, further comprising a support member that supports the plurality of light source units and the lighting device in a displaceable manner.   The lighting apparatus according to claim 6, wherein the plurality of light source units include a light emitting diode or an organic electroluminescence element as the solid state light emitting element.

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