JP2011249122A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a decrease in power supply efficiency due to power conversion loss of a power supply unit of a luminaire which has a plurality of light emission modules and the power supply unit supplying electric power thereto.SOLUTION: A luminaire 1 comprises: a plurality of light emission modules 2 having illumination loads 21; and a power supply unit 3. The light emission modules 2 are connected to the power supply unit 3 in parallel, and supplied with a constant voltage Vo within a predetermined operation voltage range and a light control signal S for controlling a current to the illumination loads 21. The power supply unit 3 are each supplied with one of an AC voltage V1 and a DC voltage V2 to output a voltage after transforming the AC voltage V1 up to a voltage having the maximum value of the operation voltage range when supplied with the AC voltage V1 or to output a voltage having the minimum value of the operation voltage range when supplied with the DC voltage V2. Consequently, the power conversion loss due to transformation is reduced to suppress the decrease in power supply efficiency.

Description

  The present invention relates to a lighting fixture having a plurality of light emitting modules and a power supply unit for supplying power to the light emitting modules.

  Conventionally, a luminaire using an organic EL element (organic electroluminescence element) as a lighting load has a plurality of light emitting modules as lamps in order to widen the light emitting area and increase the luminous flux, and each light emitting module. Have a plurality of lighting loads. As such a luminaire, one that supplies power to a plurality of light emitting modules with one power supply unit is known (see, for example, Patent Document 1). This power supply unit converts an AC voltage supplied from an external commercial AC power source, such as a transformer, and outputs a constant current to each light emitting module. However, since such a power supply unit outputs a constant current, if the number of lighting loads in each light emitting module is small, the output voltage is lowered, the power conversion loss due to transformation is increased, and the power supply efficiency is lowered. To do.

JP 2006-324208 A

  The present invention solves the above problem, and aims to suppress a decrease in power supply efficiency due to power conversion loss in a power supply unit in a lighting fixture having a plurality of light emitting modules and a power supply unit that supplies power to the light emitting modules. And

  The lighting fixture of the present invention includes a plurality of light emitting modules having a lighting load, and a power supply unit that supplies power to the light emitting modules. The light emitting modules are connected in parallel to the power supply unit, and are connected to the power supply unit. A dimming signal for adjusting a constant voltage within a predetermined operating voltage range and a current to the lighting load is supplied, and the power supply unit is supplied with either an AC voltage or a DC voltage. When receiving the supply of voltage, the voltage is transformed and output up to the maximum voltage in the operating voltage range, and when receiving the supply of DC voltage, the voltage of the minimum value in the operating voltage range is output. To do.

  The lighting fixture of the present invention includes a plurality of light emitting modules having a lighting load, and a power supply unit that supplies power to the light emitting modules, and the light emitting modules are connected in parallel to the power supply unit, and the power supply A dimming signal for adjusting a constant voltage within a predetermined operating voltage range and a current to the lighting load is supplied from the unit, and the power supply unit is supplied with either an AC voltage or a DC voltage, When the supply of AC voltage is received, the voltage is transformed and output up to the maximum voltage in the operating voltage range, and when the supply of DC voltage is received, the DC voltage is output as it is.

  In this lighting apparatus, it is preferable that the light emitting module includes a constant current circuit that performs constant current control on a current to the lighting load in accordance with a dimming signal from the power supply unit.

  According to the lighting fixture of the present invention, when the power supply unit is supplied with an AC voltage, the output voltage is increased, so that the power conversion loss due to the transformation is reduced, and the reduction in power supply efficiency can be suppressed. When the DC voltage is supplied, the output voltage is lowered, so that the output voltage of the DC power supply that supplies the DC voltage can be lowered, and the DC power supply can be downsized.

The block diagram of the lighting fixture which concerns on one Embodiment of this invention. The block diagram of the power supply unit in the lighting fixture.

  The lighting fixture which concerns on one Embodiment of this invention is demonstrated with reference to FIG.1 and FIG.2. As shown in FIG. 1, the lighting fixture 1 includes a plurality of light emitting modules 2 having lighting loads 21 and a power supply unit 3 that supplies power to the light emitting modules. The light emitting module 2 is connected in parallel to the power supply unit 3 and is supplied with a dimming signal S that adjusts a constant voltage Vo within a predetermined operating voltage range and a current to the illumination load 21 from the power supply unit 3. The power supply unit 3 is supplied with either the AC voltage V1 or the DC voltage V2 from the outside. When receiving the supply of AC voltage V1, the power supply unit 3 transforms and outputs the voltage up to the maximum value of the operating voltage range of the light emitting module 2 (Vo = Vmax). The minimum voltage in the operating voltage range is output (Vo = Vmin).

  The light emitting module 2 includes a dimming receiving circuit 22 and a lighting circuit 23 provided corresponding to the illumination load 21, and an input / output unit 24. The illumination load 21 is a light emitting element in which the input current and the light output are in a substantially proportional relationship, and is a solid illumination load such as an organic EL element or an LED (light emitting diode). The dimming reception circuit 22 and the lighting circuit 23 function as a constant current circuit that performs constant current control on the current to the lighting load 21 in accordance with the dimming signal S from the power supply unit 3. The dimming reception circuit 22 converts the dimming signal S received from the power supply unit 3 into a command value and transmits the command value to the lighting circuit 23. The lighting circuit 23 includes a step-down chopper circuit, a step-up chopper circuit, a step-up / step-down circuit, or the like according to the relationship between the output voltage Vo of the power supply unit 3 and the operating voltage of the lighting load 21. The lighting circuit 23 has a dimming function, receives a command value from the dimming reception circuit 22, and performs PWM dimming or amplitude dimming on the illumination load 21.

  The input / output unit 24 is a three-wire socket, a connector, or the like that connects the light emitting module 2 to the power supply unit 3 or another light emitting module 2. The output voltage Vo and the dimming signal S share the GND (ground line) and are supplied to the light emitting module 2 through three lines (V, S, GND). Cables are connected between the power supply unit 3 and the light emitting modules 2 and between the plurality of light emitting modules 2. The luminaire 1 has two light emitting modules 2 and each light emitting module 2 has three lighting loads 21, but the number of the light emitting modules 2 and the lighting loads 21 is not limited to this. .

  As shown in FIG. 2, the power supply unit 3 includes an AC / DC unit 31, a step-down chopper circuit 32, a constant voltage control unit 33, a dimming unit 34, a dimming signal transmission unit 35, and an output unit 36. With.

  The power supply unit 3 is supplied with an AC voltage V1 having a commercial AC power frequency from a commercial AC power supply, and supplied with a DC voltage V2 from an external DC power supply, for example, a battery. The AC voltage V <b> 1 is input to the AC / DC unit 31. The DC voltage V2 is supplied to the output unit 36.

  The AC / DC unit 31 includes a rectifier diode and a boost chopper circuit. The step-up chopper circuit has a power factor improving function. The AC / DC unit 31 converts the AC voltage V <b> 1 into a DC voltage and inputs it to the step-down chopper circuit 32. The DC voltage input to the step-down chopper circuit 32 is applied to the electrolytic capacitor C1.

  The step-down chopper circuit 32 includes a switching element Q1, a regeneration diode D1, an inductor L1, a capacitor C2, and the like in addition to the electrolytic capacitor C1. The step-down chopper circuit 32 converts the DC voltage stored in the electrolytic capacitor C1 into electric power necessary for the load by switching the switching element Q1 at a high frequency, and outputs an output voltage Vo. The output voltage Vo is divided by the resistors R1 and R2 and detected by the constant voltage control unit 33. The constant voltage control unit 33 switches the switching element Q1 via the Q1 drive circuit so that the detected output voltage Vo is constant. The switching frequency is several tens of kHz to several MHz. The output voltage Vo is charged to the smoothing electrolytic capacitor C3 through the backflow preventing diode D2. Further, a DC voltage V2 is supplied to the electrolytic capacitor C3 via a backflow preventing diode D3.

  The dimming unit 34 converts a dimming request from the outside into a dimming command value, and transmits the dimming command value to the dimming signal transmission unit 35. The dimming signal transmission unit 35 generates the dimming signal S based on the dimming command value transmitted from the dimming unit 34, and outputs the dimming signal S to the output unit 36. The dimming signal S is, for example, a PWM (pulse width modulation) signal, and includes a dimming rate as a signal. As the dimming signal S, an amplitude signal or the like may be used instead of the PWM signal.

  The output unit 36 is a three-wire socket or the like, and outputs the output voltage Vo charged in the electrolytic capacitor C3 and the dimming signal S generated by the dimming signal transmission unit 35. As the control power supply Vcc for operation of the constant voltage control unit 33, the dimming unit 34, and the dimming signal transmission unit 35, the output voltage Vo is used as it is or after being divided.

  Operation | movement of the lighting fixture 1 comprised as mentioned above is demonstrated. The operating voltage range Vmin to Vmax of the light emitting module 2 is, for example, DC15V to 24V. The power supply unit 3 is supplied with an AC voltage V1, for example, AC 100V, from a commercial AC power source or the like. In this case, the power supply unit 3 transforms to the maximum voltage Vmax (24 V) in the operating voltage range and outputs the output voltage Vo. The output voltage Vo is a constant voltage and is supplied to the plurality of light emitting modules 2 by parallel connection. The light emitting module 2 is supplied with the output voltage Vo and the dimming signal S from the power supply unit 3, and dimmes the illumination load 21 based on the dimming signal S.

  As described above, since the plurality of light emitting modules 2 are connected in parallel to the power supply unit 3, the output voltage Vo of the power supply unit 3 is constant regardless of the number of the light emitting modules 2 and the illumination loads 21. Since the illumination load 21 of the light emitting module 2 is dimmed based on the dimming signal S, the output voltage Vo of the power supply unit 3 is constant regardless of the dimming rate. The lighting fixture 1 can connect a plurality of light emitting modules 2 by a bus with such a constant voltage supply configuration, and the degree of freedom of arrangement and wiring of the light emitting modules 2 is improved.

  When the power supply unit 3 is supplied with the AC voltage V1, the output voltage Vo is increased (Vo = Vmax), so that the power conversion loss due to transformation is reduced, and the power supply efficiency can be prevented from being lowered. Further, by increasing the output voltage Vo, the voltage drop due to the wiring from the power supply unit 3 to the light emitting module 2 is compensated, so that the distance from the power supply unit 3 to the light emitting module 2 can be increased. The degree of freedom of placement and wiring is improved.

  When the power supply unit 3 is supplied with the DC voltage V2, the output voltage Vo of the power supply unit 3 is set to the minimum voltage Vmin (15V) in the operating voltage range. Since the output voltage Vo is low (Vo = Vmin), the DC voltage V2 can be lowered. By reducing the DC voltage V2, the output voltage of the DC power supply that supplies the DC voltage V2 can be lowered, and the DC power supply can be downsized. The DC voltage V2 is output as it is as the output voltage Vo of the power supply unit 3. For this reason, the power conversion loss by transformation can be prevented. The output voltage Vo is supplied to the light emitting module 2. The output voltage Vo is also used as a control power supply Vcc for the dimmer 34 and dimmer signal transmitter 35. For this reason, even when the power supply unit 3 is supplied with the DC voltage V2 without being supplied with the AC voltage V1, the dimming unit 34 and the dimming signal transmitting unit 35 operate, and the dimming signal is sent to the light emitting module 2. S can be supplied.

(Modification)
The modification of the lighting fixture 1 of this embodiment is demonstrated. In the present modification, the light emitting module 2 is configured to be able to directly receive the supply of the DC voltage V2 without going through the power supply unit 3. The lighting fixture 1 of the present modification is electrically equivalent to allowing the direct current voltage V2 supplied to the power supply unit 3 to pass through and output to the light emitting module 2, but the direct current voltage V2 is supplied. The connection of the power source is different from the above embodiment. In the lighting fixture 1 of the present modification, a battery as a direct current power source may be connected to the power supply unit 3 or directly connected to the light emitting module 2. When the battery is directly connected to the light emitting module 2, the direct current voltage V2 is supplied to the light emitting module 2, but the dimming signal S is not supplied. When the dimming signal S is not supplied, the light emitting module 2 performs a preset operation, for example, lighting at a dimming rate of 100%.

  In order to allow the battery to be directly connected to the light emitting module 2, the input connector shapes for the DC voltage V2 input of the power supply unit 3 and the light emitting module 2 are made the same. These input connector shapes may be different shapes, and the battery may be connected to the light emitting module 2 via the conversion connector. The conversion connector may also serve as a wiring cable, so that the battery can be arranged at a position away from the light emitting module 2.

  Thus, by configuring the battery so that it can be connected to both the power supply unit 3 and the light emitting module 2, the degree of freedom of wiring and arrangement of the lighting fixture 1 is improved, and the usage pattern of the lighting fixture 1 is expanded. In addition, by directly connecting and lighting a battery to some of the light emitting modules 2 among the plurality of light emitting modules 2, it is possible to light a specific light emitting module with a battery having a small capacity.

  In addition, this invention is not restricted to the structure of said embodiment, A various deformation | transformation is possible in the range which does not change the summary of invention. For example, the power supply unit 3 may be configured to transform the supplied DC voltage V2 and supply the output voltage Vo. The power supply unit 3 configured as described above outputs the voltage having the minimum value in the operating voltage range when receiving the supply of the DC voltage V2 (Vo = Vmin). As a result, the output voltage of the DC power supply that supplies the DC voltage V2 can be lowered, and the DC power supply can be downsized. The direct current power source is not limited to a battery, and may be a solar power generation device or the like.

DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Light-emitting module 21 Lighting load 3 Power supply unit S Dimming signal V1 AC voltage V2 DC voltage Vo Output voltage Vmax Voltage Vmin of the maximum operating range Voltage Vmin of the minimum operating range

Claims (3)

A plurality of light emitting modules having a lighting load, and a power supply unit for supplying power to the light emitting modules, the light emitting modules being connected in parallel to the power supply unit and within a predetermined operating voltage range from the power supply unit. A luminaire provided with a dimming signal for adjusting a constant voltage and a current to the lighting load,
The power supply unit is supplied with either an AC voltage or a DC voltage. When the AC voltage is supplied, the power supply unit transforms and outputs the voltage up to the maximum value in the operating voltage range, and receives the DC voltage. In some cases, the lighting apparatus outputs a voltage having a minimum value in the operating voltage range. A plurality of light emitting modules having a lighting load, and a power supply unit for supplying power to the light emitting modules, the light emitting modules being connected in parallel to the power supply unit and within a predetermined operating voltage range from the power supply unit. A luminaire provided with a dimming signal for adjusting a constant voltage and a current to the lighting load,
The power supply unit is supplied with either an AC voltage or a DC voltage. When the AC voltage is supplied, the power supply unit transforms and outputs the voltage up to the maximum value in the operating voltage range, and receives the DC voltage. In this case, the lighting apparatus outputs the DC voltage as it is.   The lighting apparatus according to claim 1, wherein the light emitting module includes a constant current circuit that performs constant current control on a current to the lighting load in accordance with a dimming signal from the power supply unit.

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