JP5386421B2 - Lighting apparatus and light emitting module used therefor - Google Patents

Description

  The present invention relates to a luminaire including a light emitting module fed by a power supply unit and a light emitting module used therefor.

  Conventionally, in this kind of lighting fixture, what drives the illumination load in each light emitting module by supplying electric power with respect to several light emitting modules from a power supply unit is known (for example, refer patent document 1). . In the lighting fixture having such a configuration, the light emitting modules are electrically connected to each other, and power is supplied through the light emitting modules. Moreover, it is comprised so that illumination load may be connected in parallel with a power supply unit within each light emitting module, and the freedom degree of the connection of a light emitting module is high.

  By the way, in the structure which connects illumination load in parallel as mentioned above, it is possible to apply a fixed voltage to each light emitting module using a constant voltage source for a power supply unit. In such a usage mode, when the power supply unit does not have a limiter function for limiting the output current, the load current of the power supply unit increases as the number of light emitting modules connected to the power supply unit increases. Stress may occur in the elements in the power supply unit. On the other hand, when the power supply unit has the limiter function described above, if a light emitting module is connected beyond the rated capacity of the power supply unit, the current supplied to each light emitting module is reduced and the luminous flux of the illumination load is reduced. Therefore, the required light output may not be obtained. In such a case, if an attempt is made to use a power supply unit having a large rated capacity, there is a risk of increasing the size and cost of the instrument.

JP 2006-324208 A

  The present invention has been made to solve the above problem, and even if the number of light emitting modules connected to the power supply unit is increased while the configuration is low-cost without increasing the rated capacity of the power supply unit. An object of the present invention is to provide a lighting fixture and a light emitting module used therefor, which can prevent a large load from being applied to the power supply unit and a reduction in the luminous flux of the lighting load.

  The luminaire of the present invention includes a power supply unit having a constant voltage source unit and a light emitting module fed by the power supply unit, and the light emitting module is electrically connected to the power supply unit or another light emitting module. The power supply unit includes a load signal output unit that outputs, as a load signal, a voltage corresponding to the number of light emitting modules connected to the unit, based on a current value output from the unit. The module includes a lighting load connected in parallel with the power supply unit, a lighting device for controlling an input current to the lighting load, a first switch for turning on / off power to at least the light emitting module, and the load signal. A second switch for turning on / off the load signal from the output unit with respect to another light emitting module; A power source voltage discriminating unit that compares these values with each other and discriminating the magnitude thereof; and by turning on and off the first and second switches based on a discrimination result by the power source voltage discriminating unit, the light emitting module from the power source unit And a control circuit for controlling the power supplied to the device.

  In this lighting fixture, the power supply unit includes a dimming unit that generates a dimming signal for dimming and driving the lighting load, and the lighting device includes the lighting unit according to the dimming signal from the dimming unit. It is preferable to adjust the current to the load.

  In this lighting fixture, the power supply voltage determination unit includes a comparator, and the comparator receives a load signal from the load signal output unit at one input end and a reference voltage at the other input end, The output terminal is preferably connected to the control circuit.

  In this lighting apparatus, it is preferable that the reference voltage input to the comparator is variable.

  In this lighting apparatus, the control circuit turns off the first switch when the load signal from the load signal output unit is larger than the reference voltage, and turns off the first switch when the load signal is smaller than the reference voltage. It is preferable to turn on the switch.

  In this lighting apparatus, the first switch includes a switch for turning on / off a power supply on a side to which a power supply unit is connected, and a switch for turning on / off a power supply not on a side to which the power supply unit is connected, When the number of power supply units connected to the light emitting module is one, it is preferable to turn on the first and second switches.

  In this lighting apparatus, when there are a plurality of power supply units connected to the light emitting module, the control circuit compares the load signals from the load signal output unit of each power supply unit and supplies power from the power supply unit having a low voltage value of the load signal. It is preferable to turn on the first switch.

  In this lighting fixture, it is preferable that the first and second switches are configured so that a current flows in both directions.

  The light emitting module of the present invention is used for the above-mentioned lighting fixture.

  According to the lighting fixture of the present invention, if the voltage of the load signal exceeds the reference value, the light source module exceeding the rated capacity is connected to the power supply unit, and the first switch is turned off to turn off the power supply unit. Therefore, the load applied to the power supply unit can be reduced. In addition, when a plurality of light emitting modules are connected exceeding the rating of the power supply unit and the power supplied to each light emitting module is reduced, a new power supply unit is provided in the light emitting module, so that this power supply unit The light output of the light emitting module can be maintained at a high level. At this time, the newly provided power supply unit can be of the same specification as that of the existing power supply unit, so that common parts and miniaturization (so-called MT) can be realized and the cost is low.

The block diagram of the lighting fixture which concerns on one Embodiment of this invention. The electric circuit diagram of the power supply unit in the said lighting fixture. The electric circuit diagram of the Vn discrimination | determination part of the lamp in the said lighting fixture. The electric circuit diagram of the control circuit of the said lamp. The figure which shows the list | wrist of the operation logic of the said control circuit. The electric circuit diagram of the 1st switch of the said lamp. The figure which shows the example of the connection pattern of the said power supply unit and a lamp. The figure which shows the other example of the said connection pattern. The block diagram which shows the modification of the said lighting fixture. The block diagram which shows the other modification of the said lighting fixture.

  A lighting apparatus according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the luminaire 1 includes a power supply unit 2 having a constant voltage source unit, and a lamp 3 that is a light emitting module fed with power from the power supply unit 2. The power supply unit 2 and the lamp 3 are electrically connected to each other. In this luminaire 1, it is possible to add more lamps by electrically connecting another lamp 3 a to the lamp 3. A power supply unit 2a different from the power supply unit 2 is provided on the rear side of the added lamp 3a. The power supply unit 2a may be provided as necessary.

  The power supply unit 2 receives a power supply from an AC input and generates a DC power supply, and outputs a DC voltage Vo (relative to the ground potential GND) to the lamp 3. The power supply unit 2 includes a load signal output unit 20 that outputs a voltage corresponding to the number of lamps connected to the unit 2 as a load signal Vn. The power supply unit 2 is configured to output a dimming signal S for dimming the lamp 3. The power supply unit 2 and the lamp 3 are connected by four lines corresponding to the DC voltage Vo, the dimming signal S, the load signal Vn, and the ground potential GND.

  The lamp 3 includes two connection portions 31a and 31b. Here, the power supply unit 2 is connected to the connection portion 31a, and the lamp 3a is connected to the connection portion 31b. The lamp 3 receives power output from the power supply unit 2 at the connection portion 31a and receives power output from the power supply unit 2a at the connection portion 31b. The connection portions 31a and 31b are connected by four lines of a DC voltage Vo, a dimming signal S, a ground potential GND, and a load signal Vn. Each connection part 31a, 31b can be electrically connected to both the power supply unit 2 and the other lamp 3. For example, the other lamp 3a is connected to the connection part 31a, and the power supply unit 2 is connected to the connection part 31b. It is also possible to connect the power supply units to the connection portions 31a and 31b.

  The lamp 3 includes a light emitting element 32 that is an illumination load, a lighting device 33 that controls an input current to the light emitting element 32, a dimming signal receiving unit 34 that receives the dimming signal S from the power supply unit 2, and the lamp 3. Are provided with switches SW1 and SW2 for turning on / off the power source and switch SW3 for turning on / off the load signal Vn from the load signal output unit 20. Further, the lamp 3 is changed from the power supply units 2 and 2a to the lamp 3 based on the determination results of the Vn determination units 35a and 35b (voltage power supply determination unit) and the Vn determination units 35a and 35b that determine the voltage level of the load signal Vn. And a control circuit 36 for controlling supplied power.

  The light emitting element 32 is connected to the line of the DC voltage Vo and the two lines of the ground potential GND via the lighting device 33, and is connected in parallel to the power supply units 2 and 2a. The light emitting element 32 is composed of a solid light emitting element such as an organic EL or LED, and an element in which the relationship between the input current and the light output is approximately proportional is used. The number of light emitting elements 32 is not limited to one and may be plural. The lighting device 33 includes a constant current circuit that drives the light emitting element 32 with a constant current, and includes, for example, a step-down chopper circuit. The lighting device 33 can also receive the dimming signal S from the dimming signal receiving unit 34 and adjust the current to the light emitting element 32 in accordance with this signal. The lighting device 32 is not limited to the above-described configuration, and may be configured using a boost chopper circuit or a step-up / down circuit in consideration of the relationship between the output voltage of the power supply unit 2 and the drive voltage of the light emitting element. . The dimming signal receiving unit 34 is connected to two lines of the dimming signal S and the ground potential GND.

  The switch SW1 turns on and off the power supply on the connection portion 31a side, and is inserted on the connection portion 31a side on the line of the DC voltage Vo. The switch SW2 turns on and off the power supply on the connection portion 31b side, and is inserted on the connection portion 31b side on the line of the DC voltage Vo. Both of these switches SW1 and SW2 form a first switch in the claims. The switch SW3 is inserted between the Vn determination units 35a and 35b on the line of the load signal Vn, and turns on / off the load signal Vn input to the lamp 3 with respect to the other lamp 3a. The switch SW3 forms a second switch in the claims.

  The Vn discriminating units 35a and 35b compare the input load signal Vn with a preset reference value, and discriminate between these values. The Vn determination unit 35a is disposed on the connection unit 31a side, and determines a load signal input from the connection unit 31a. The Vn determination unit 35b is arranged on the connection unit 31b side and determines a load signal from the connection unit 31b. The Vn discriminating units 35a and 35b are arranged according to the number of connecting parts, and are configured with two here. For example, when there are three connecting parts, the number of connecting parts is three. To do.

  The control circuit 36 controls the electric power supplied to the lamp 3 by turning on / off the first switch SW1, SW2 and the second switch SW3 based on the determination result by the Vn determination units 35a, 35b. Do. The control circuit 36 turns on the first switch SW1 when the load signal Vn is larger than the reference value, and turns off the first switch SW1 when the load signal Vn is smaller than the reference value. When there is one power supply unit connected to the lamp 3, the control circuit 36 turns on the first switches SW1, SW2 and the second switch SW3, whereby the lamp on the side where the power supply unit is not connected. Send the power supply to the wiring. When there are a plurality of power supply units that supply power to the lamp 3, as in the present embodiment, the control circuit 36 compares the load signals from the load signal output unit of each power supply unit, and starts from the power supply unit with a low voltage value of the load signal. The first switches SW1 and SW2 are turned on so that power is supplied.

  Next, the circuit configuration of the power supply unit 2 and the lamp 3 will be described. As shown in FIG. 2, the power supply unit 2 includes an input unit 21, an AC / DC unit 22, a control power supply circuit 23, a DC / DC unit 24, a constant voltage control unit 25, an output current detection unit 26, and a dimming signal transmission unit. 27, a light control unit 28 and an output unit 29. The input unit 21 includes an input filter including a noise removing inductor and capacitor, and a surge absorber. The input side is connected to a commercial AC power source and the output side is connected to the AC / DC unit 22. The AC / DC unit 22 includes a rectifier diode and a step-up chopper circuit having a power factor improving function. The AC / DC unit 22 converts a 50 Hz or 60 Hz AC from a commercial AC power source into a DC voltage, and converts the AC voltage into an electrolytic capacitor C1 of the DC / DC unit 24. Apply DC voltage. The voltage value of the AC / DC unit 22 is kept constant, for example, several hundred volts, and is set in consideration of the voltage of the commercial AC power supply.

  The control power supply circuit 23 is composed of voltage dividing resistors R1 and R2 and a Zener diode ZD1, and generates a constant voltage Vcc. This voltage Vcc is a power supply voltage supplied to each circuit in the power supply unit 2. The DC / DC unit 24 is a step-up chopper circuit, and includes a switching element Q1, a driving unit 24a, a regeneration diode D1, an inductor L1, and capacitors C1 and C2. In the DC / DC unit 24, the drive unit 24a switches the switching element Q1 at a high frequency, thereby converting the DC voltage stored in the capacitor C1 into electric power necessary for the load and outputting it to the output unit 29. . The voltage output from the DC / DC unit 24 is maintained at a constant voltage (for example, 24V), and constant voltage control is performed so that the divided voltage of the resistor R3 and the resistor R4 connected in series between the load voltage and the ground is constant. Unit 25 controls on / off of switching element Q1. The frequency of the switching element Q1 is several tens of kHz to several MHz.

  The output current detector 26 includes a resistor R5 and an amplifier circuit 26a. The output current detector 26 detects a voltage generated by the current flowing through the resistor R5, and transmits the detected voltage to the dimming signal transmitter 27 as a voltage amplitude signal. The dimming signal transmission unit 27 includes a combination of general-purpose ICs, a microcomputer, and the like, and outputs a PWM signal as a dimming signal based on a command value from the dimming unit 28 and a detection result from the output current detection unit 26. Send to. The PWM signal has an amplitude of 12 V, and the dimming rate increases as the duty ON time decreases at 1 kHz. When the PWM signal is output at the rated value, the dimming rate becomes 100%. In addition, the structure which transmits an amplitude signal as a light control signal may be sufficient.

  The dimming unit 28 converts the dimming request transmitted from the outside into a dimming command value by a conversion function corresponding to the request, and transmits the dimming command value to the dimming signal transmission unit 27. This dimming command value is converted into a dimming signal by the dimming signal transmitter 27. The output unit 29 has three terminals for outputting a constant controlled DC voltage Vo output from the DC / DC unit 24, a dimming signal S from the dimming signal transmission unit 27, and a ground potential GND. ing. The output unit 29 includes a load signal output unit 20, and the load signal output unit 20 has a terminal for outputting the load signal Vn. The load signal output unit 20 is connected to the output current detection unit 26, and a voltage detected by the output current detection unit 26 is input thereto. Since a voltage proportional to the load current output from the terminal of the DC voltage Vo is generated in the resistor R5, the load signal output unit 20 outputs this voltage as a load signal, so that the load on the power supply unit 2 in the lamp 3 (light emission). The connection state of the element 32) can be understood.

  As shown in FIG. 3, the Vn determination unit 35a of the lamp 3 includes a comparator COMP1 connected between the Vn1 terminal and the GND terminal from the connection unit 31a, and a reference voltage source 37 that inputs the reference voltage Vref to the comparator COMP1. And have. Here, the load signal output from the connecting portion 31a is Vn1, and the terminal is the Vn1 terminal. In the comparator COMP1, the load signal Vn1 from the Vn1 terminal is input to the positive input terminal, and the reference voltage Vref of the voltage source 37 is input to the negative input terminal. The output terminal of the comparator COMP1 is connected to the control circuit 36, and outputs a comparison signal SR1 that takes a difference between the load signal Vn1 and the reference voltage Vref to the control circuit 36. The comparison signal SR1 becomes H level when the load signal Vn1 is larger than the reference voltage Vref, and becomes L level when the load signal Vn1 is smaller than the reference voltage Vref. The voltage source 37 is configured such that the reference voltage Vref is variable. Here, the Vn1 terminal from the connecting portion 31a is sent to the control circuit 36 and the second connecting portion 31b, and the GND terminal is sent to the second connecting portion 31b. The Vn determination unit 35b has the same configuration as the Vn determination unit 35a. Since the load signal Vn1 is a signal obtained by detecting a voltage proportional to the load current of the power supply unit 2, the load signal Vn1 has a value corresponding to the number of connected lamps. Accordingly, if the reference voltage Vref is set to an appropriate value based on the rating of the power supply unit 2, the lamp 3 is turned off when the comparison signal SR1 becomes H level. It becomes possible to detect that 3a cannot be added.

  As shown in FIG. 4, the control circuit 36 receives the comparison signal SR1 and the load signal Vn1 from the Vn discrimination unit 35a and the comparison signal SR2 and the load signal Vn2 from the Vn discrimination unit 35b as input signals, and receives these signals. Based on this, a drive signal for turning on / off the first switch SW1, SW2 and the second switch SW3 is generated. The control circuit 36 includes knot circuits NOT 1 to 3, AND circuits AND 1 to 4, NOR circuits NOR 1, OR circuits OR 1 to 3, and a comparator COMP (Vn), and these circuits operate as shown in FIG. Realize logic. This operation logic will be described later.

  As shown in FIG. 6, the first switch SW1 is configured such that a current flows bidirectionally between the connection end A and the connection end B, and includes the switching elements Q2 and Q3, the switching element Q2, Diodes D2 and D3 connected in parallel to Q3 and a drive circuit 38 for switching and driving the switching elements Q2 and Q3 are provided. The respective switching elements Q2 and Q3 are connected in series, and are arranged so that the switching element Q2 is connected to the connection end A and the switching element Q3 is connected to the connection end B. The diode D2 has an anode side connected to the connection end A and a cathode side connected to the connection end A, and the diode D2 has an anode side connected to the connection end A and a cathode side connected to the connection end B. Based on the drive signal from the control circuit 36, the drive circuit 38 turns on / off the switching elements Q2, Q3 according to the direction of the current between the connection ends A, B. The drive circuit 38 turns on the switching element Q2 and turns off the switching element Q3 if a current flows from the connection end A when the drive signal is “ON”. As a result, a current flows through the path from the connection end A to the switching element Q2 to the diode D3 to the connection end B. When the drive signal is “ON”, the drive circuit 38 turns off the switching element Q2 and turns on the switching element Q3 if a current flows from the connection terminal B. As a result, a current flows through the path from the connection end B to the switching element Q3 to the diode D2 to the connection end A. The first switch SW2 and the second switch SW3 have the same configuration as the first switch SW1.

The operation logic of the switches SW1, SW2, and SW3 executed by the control circuit 36 in the lighting fixture 1 configured as described above will be described with reference to FIGS. 1 and 5 described above. FIG. 5 shows ON / OFF operation inputs to the switches SW1, SW2, and SW3 for the outputs (H or L level) of the comparison signals SR1 and SR2.
When comparison signal SR1 is at H level and SR2 is at H level, switches SW1 and SW2 are turned off (first mode).
When the comparison signal SR1 is at the H level and SR2 is at the L level, the switch SW1 is turned off and the switches SW2 and SW3 are turned on (second mode).
When comparison signal SR1 is at L level and SR2 is at H level, switches SW1 and SW3 are turned on and SW2 is turned off (third mode).
When the comparison signal SR1 is L level and SR2 is L level, when the load signal Vn1 ≧ Vn2, the switch SW1 is turned off and the switch SW2 is turned on. When the load signal Vn1 <Vn2, the SW1 is turned on. Then, SW2 is turned off (fourth mode).

(First mode)
When each comparison signal SR1, SR2 is at the H level, each power supply unit 2, 2a is in a state where the output current exceeds the rating. At this time, when the first switches SW1 and SW2 are turned off, the current paths from the respective power supply units 2 and 2a to the lighting device 33 of the lamp 3 are cut off. As a result, the power supply by the power supply units 2 and 2a is stopped. Is done. When the power supply by each of the power supply units 2 and 2a is stopped, the light emitting element 32 is turned off.

(Second mode)
When the comparison signal SR1 is at the H level and SR2 is at the L level, the power supply unit 2 is in a state where the output current exceeds the rating, and the power supply unit 2a is in a state where power can be supplied to the lamp 3. At this time, when the first switch SW1 is turned off and the first switch SW2 is turned on, the power supply by the power supply unit 2 is stopped and the power supply by the power supply unit 2a is continued. When the lamp 3 receives power from two power supply units as in this embodiment, it is not always necessary to turn on SW3. However, when power is supplied from one power supply unit, SW3 is turned on, It is necessary to send a load signal Vn to the additional lamp (other lamp 3a).

(Third mode)
When the comparison signal SR1 is at the L level and SR2 is at the H level, the power supply unit 2 is in a state where power can be supplied to the lamp 3, and the power supply unit 2a is in a state where the output current exceeds the rating. At this time, when the first switch SW1 is turned on and the first switch SW2 is turned off, the power supply by the power supply unit 2 is continued, and the power supply by the power supply unit 2a is stopped.

(4th mode)
When each comparison signal SR1, SR2 is at L level, each power supply unit 2, 2a is in a state in which power can be supplied to the lamp 3. Therefore, by comparing the magnitudes of the load signals Vn1, Vn2, a power supply with less load Receive power from the unit. That is, when the load signal Vn1 ≧ Vn2, since the current output from the power supply unit 2a is smaller than that of the power supply unit 2, the first switch SW1 is turned off and the first switch SW2 is turned on. As a result, only the power supply by the power supply unit 2a is continued. When the load signal Vn1 <Vn2, since the current output from the power supply unit 2 is less than that of the power supply unit 2a, the first switch SW1 is turned on and the first switch SW2 is turned off. As a result, only the power supply by the power supply unit 2 is continued.

  As described above, in the lighting fixture 1 according to the present embodiment, if the voltage of the load signal Vn exceeds the reference value, the lamps exceeding the rated capacity are connected to the power supply unit 2 and the first switches SW1 and SW2 are connected. Since the power supply from the power supply unit 2 can be cut off in the lamp 3 by turning off the power, the load on the power supply unit 2 can be reduced. Thereby, the load concerning the power supply unit 2 can be made small. In addition, when a plurality of lamps 3 and 3a are connected exceeding the rating of the power supply unit 2 and the power supplied to the lamps 3 and 3a is reduced, a new power supply unit 2a is provided in the lamp 3a. This power can be supplemented from the power supply unit 2a, and the light output of the lamps 3 and 3a can be maintained at a high level. At this time, the newly provided power supply unit 2a can be of the same specification as that of the existing power supply unit 2, so that it is possible to realize common parts and miniaturization (so-called MT) and to reduce the cost. .

  Also, the load signals Vn1 and Vn2 from the power supply units 2 and 2a are compared, and the first switches SW1 and SW2 are turned on / off so that the lamp 3 is supplied with power from the power supply unit on the smaller load side. The load applied to 2 and 2a can be distributed substantially evenly to each. Therefore, the load is not biased to one power supply unit, and the life of the power supply unit can be extended.

  Further, since the lighting device 33 adjusts the current to the light emitting element 32 based on the dimming signal S from the dimming unit 28, the rated capacity of the power supply unit is maintained even when the dimming drive of the lamp 3 is performed. When a lamp exceeding 1 is connected and the power supply unit is overloaded, the power supply can be stopped or the load applied to the power supply unit can be evenly distributed. At this time, it is desirable that the reference voltage input to the comparator COMP1 is appropriately set according to the dimming signal S. In addition, since the reference voltage input to the comparator is variable, the allowable number of lamps connected to the power supply unit can be changed as appropriate even when the lamps are lit.

  In addition, since the first switch SW1, SW2, and the second switch SW3 are configured so that a current flows in both directions, the lamp 3 has the switches SW1, SW2 according to the direction of the electric power input to the lamp 3. By turning on and off SW2 and SW3, it is possible to receive power or load signals from the power supply units 2 and 2a from both directions, and to send the power to other lamps.

Next, the connection pattern of the power supply unit 2 and the lamp 3 in the lighting fixture 1 of this embodiment is demonstrated using FIG. 7, FIG. In the above, as shown in FIG. 7, a plurality of lamp _{3 1,} 3 2, will connect · · · _{3 n} strung, connect the power unit _{2 1} in front of the lamp _{3 1,} lamp _{3 n} was pattern of connecting the power supply unit 2 ₂ downstream of. In contrast, as shown in FIG. 8, the power supply unit 2 ₂ may be connected between the lamp 3 _n-1, 3 _n. In such a connection pattern, the lamps 3 ₁ , 3 ₂ ,... 3 _n−1 are fed by the power supply units 2 ₁ and 2 ₂ , and the lamp 3 _n is fed by the power supply unit 2 _2. 3 _{1, 3} 2, · · · _{3 n} because is suitably controlled by a load signal from the power supply unit ₂ 1, _{2 2,} in the same manner as described above, load on each of the power supply units ₂ 1, _{2 2} decreases.

  Moreover, the lighting fixture 1 which concerns on the modification of this embodiment is demonstrated using FIG. 9, FIG. In the lighting fixture 1 shown in FIG. 9, each lamp 3 includes three light emitting elements 32, lighting devices 33, and dimming signal receiving units 34. Also in such a lighting fixture 1, when the lamp 3 exceeding the rating is connected to the power supply unit 2, power supply from the power supply unit is cut off in the lamp, and no current flows through each light emitting element 32. The load applied to the power supply unit 2 is reduced.

  The lamp 3 of the luminaire 1 shown in FIG. 10 includes a planar organic EL element 32a as a light emitting element. Each lamp 3 is electrically connected to each other, and the power supply unit 2 is electrically connected to one lamp 3. According to such a lighting fixture 1, a thin lamp can be realized, and for example, it is suitable as indoor lighting.

  In addition, this invention is not restricted to the structure of the said embodiment, A various deformation | transformation is possible in the range which does not change the meaning of invention. For example, in the above description, the configuration in which power is supplied to the lamp using two power supply units has been described, but one power supply unit or three or more power supply units may be provided. Further, the lamp may include three or more connection portions, and may be configured to connect a plurality of power supply units and lamps. In such a case, Vn discriminating units are added as many as the number of connection units, and the logic operation of the control circuit is appropriately changed.

DESCRIPTION OF SYMBOLS 1 Lighting fixture 2, 2a Power supply unit 20 Load signal output part 28 Light control part 3 Lamp (light emitting module)
3a Lamp (other light emitting module)
32 Light emitting element (lighting load)
33 lighting device SW1, SW2 1st switch SW3 2nd switch 35a, 35b Vn discrimination | determination part (voltage power supply discrimination | determination part)
COMP1 Comparator 36 Control circuit 37 Reference voltage source Vn, Vn1, Vn2 Load signal

Claims (9)

A power supply unit having a constant voltage source unit, and a light emitting module powered by the power supply unit, the light emitting module being a lighting fixture electrically connected to the power supply unit or another light emitting module,
The power supply unit is
Based on the current value output by the unit, a load signal output unit that outputs a voltage corresponding to the number of light emitting modules connected to the unit as a load signal,
The light emitting module
A lighting load connected in parallel with the power supply unit;
A lighting device for controlling an input current to the lighting load;
A first switch for turning on / off the power to at least the light emitting module;
A second switch for turning on and off the load signal from the load signal output unit with respect to another light emitting module;
A power supply voltage determination unit that compares the load signal with a preset reference value and determines the magnitude thereof,
And a control circuit that controls power supplied from the power supply unit to the light emitting module by turning on and off the first and second switches based on a determination result by the power supply voltage determination unit. Lighting equipment. The power supply unit includes a dimming unit that generates a dimming signal for dimming and driving the lighting load.
The lighting device according to claim 1, wherein the lighting device adjusts a current to the lighting load in accordance with a dimming signal from the dimming unit.   The power supply voltage discriminating unit includes a comparator, and the comparator receives a load signal from the load signal output unit at one input terminal, a reference voltage at the other input terminal, and an output terminal at the control terminal. The lighting apparatus according to claim 2, wherein the lighting apparatus is connected to a circuit.   The lighting apparatus according to claim 3, wherein the reference voltage input to the comparator is variable.   The control circuit turns off the first switch when a load signal from the load signal output unit is larger than the reference voltage, and turns on the first switch when the load signal is smaller than the reference voltage. The lighting fixture according to claim 3 or 4, characterized by the above. The first switch includes a switch for turning on and off the power supply on the side to which the power supply unit is connected, and a switch for turning on and off the power supply not on the side to which the power supply unit is connected,
The control circuit includes:
The lighting apparatus according to any one of claims 1 to 5, wherein when the number of power supply units connected to the light emitting module is one, the first and second switches are turned on. The control circuit includes:
When there are a plurality of power supply units connected to the light emitting module, the load signals from the load signal output unit of each power supply unit are compared, and the first switch is set so that power is supplied from the power supply unit having a low voltage value of the load signal. The lighting apparatus according to claim 6, wherein the lighting apparatus is turned on.   The lighting apparatus according to claim 6 or 7, wherein the first and second switches are configured such that a current flows in both directions.   The light emitting module used for the lighting fixture of Claim 1 thru | or 8.

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