JP7299562B2 - Power supply and lighting system - Google Patents

Description

Embodiments of the present invention relate to a power supply device and a lighting device that perform dimming operation of at least two or more light sources with different light colors.

2. Description of the Related Art Conventionally, in facilities such as theaters, for example, a plurality of lighting devices are installed to illuminate audience seats, aisles, and the like. In such a lighting device, for example, two light sources with different light colors are used, and a power supply section is used to perform dimming operation for each light source of each system. Then, during dimming, for example, the color is adjusted so that the color changes in the same manner as the color change during dimming of a halogen lamp, or the light is adjusted so as to maintain a constant light color.

Since the light sources of the respective systems are dimmed and turned on, variations in output from the power source to the light sources of the respective systems are likely to occur. Therefore, when the light source is dimmed toward turning off, the variation in the output from the power supply to the light source of each system tends to become noticeable just before turning off, and the system with high output from the power supply In some cases, it is easy to feel variations in the light color, such as changing the color of the light.

JP 2018-113226 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power supply device and a lighting device that make it difficult to perceive variation in light color just before turning off the light source when dimming the light source.

A power supply device according to an embodiment includes a power supply section that performs dimming operations on at least two or more light sources with different light colors, and a control section that inputs a dimming signal and controls the dimming operation of the light sources by the power supply section. The control unit determines from the dimming signal whether the dimming is dimming for turning off or normal dimming other than dimming for turning off. Let In normal dimming, the control unit controls the light source dimming operation in which the output of the power supply unit changes exponentially. The output of the power supply unit, which has been changing linearly, is controlled to the dimming operation of the light source that changes linearly.

According to the power supply device of the embodiment, it can be expected that when the light source is turned off and dimmed, it is difficult to perceive variations in the light color just before the light is turned off.

1 is a block diagram of a lighting system using a power supply device and a lighting device according to an embodiment; FIG. It is a graph which shows the 1st dimming control of the dimming operation|movement of a power supply device same as the above, and shows the relationship between time and the output of a power supply part. It is a graph which shows the 2nd dimming control of the dimming operation|movement of a power supply device same as the above, and shows the relationship between time and the output of a power supply part.

An embodiment will be described below with reference to the drawings.

FIG. 1 shows a lighting system 10 for use in a facility such as a theater. The lighting system 10 includes a lighting device 11 and a dimmer 12 that controls the dimming operation of the lighting device 11. As shown in FIG. Although only one lighting device 11 is shown in FIG. 1, a plurality of lighting devices 11 are used in facilities such as theaters.

The lighting device 11 is, for example, a downlight or the like installed on the ceiling of a facility such as a theater. The lighting device 11 includes a fixture body (not shown) installed on the ceiling of the facility, a light source unit 15 arranged in the fixture body, and a power supply device 16 that supplies lighting power to the light source unit 15 to light it up. I have it.

The light source unit 15 has, for example, two systems of light sources 15a and 15b with different light colors. The different light colors are, for example, a combination of neutral white and incandescent color temperatures, but may be a combination of light colors including other color temperatures. The light source section 15 may be configured by a light emitting module in which light sources 15a and 15b are formed on one substrate, for example. For the light sources 15a and 15b, LEDs, which are semiconductor light emitting elements, are used, but other semiconductor light emitting elements such as organic EL may be used. In addition, the light source unit 15 has at least two or more light sources. For example, it may have three light sources for each light color of RGB to support full color, or four or more light sources. good too.

The power supply device 16 includes power supply units 16a and 16b of each system provided corresponding to each of the light sources 15a and 15b of each system. Each power supply unit 16a, 16b outputs lighting power to the light sources 15a, 15b of the corresponding system to light the light sources 15a, 15b respectively (dimming operation), and dimming from the dimmer 12 It is provided with control units 18a and 18b for inputting signals and controlling dimming operations of the light sources 15a and 15b by the power supply units 17a and 17b.

The power supply units 17a and 17b receive an external power supply E such as a commercial AC power supply, convert it into a predetermined lighting power supply for dimming the light sources 15a and 15b, and supply the power supply to the light sources 15a and 15b. The power supply units 17a and 17b include, for example, a rectifier circuit that rectifies the AC voltage of the external power supply E, a power factor improvement circuit such as a boost chopper circuit that converts the AC voltage rectified by the rectifier circuit into a DC voltage, and the power factor correction circuit. A driving circuit such as a step-down chopper circuit is provided for converting the DC voltage from the improvement circuit into a predetermined DC voltage to be supplied to the light emitting element. The drive circuit has a switching element, controls the current supplied to the light sources 15a and 15b by the switching operation of the switching element, and dims the light sources 15a and 15b. The switching elements perform switching operations according to control signals from the control units 18a and 18b.

The control units 18a and 18b receive a dimming signal from the dimmer 12 and control the dimming operation of the light sources 15a and 15b by the power supply units 17a and 17b according to the dimming signal. It controls the switching operation of the switching elements of the driving circuits of the parts 17a and 17b.

The control units 18a and 18b have a function of judging from the dimming signal input from the dimmer 12 whether the dimming is dimmed toward the dimming or the normal dimming other than the dimming toward the dimming. It also has a function of differentiating the dimming operation of the light sources 15a and 15b by the power supply units 17a and 17b depending on the dimming. By varying the dimming operation, control is performed so that the time during which the output is equal to or less than a predetermined output is shorter during off-dimming than in the control according to the dimming curve during normal dimming.

The control units 18a and 18b provide the first dimming control function and the second dimming control function in order to change the dimming operation of the light sources 15a and 15b by the power supply units 17a and 17b between off dimming and normal dimming. It has the function of control.

The first dimming control function is to control the dimming operation of the light sources 15a and 15b in which the outputs of the power supply units 17a and 17b change exponentially in normal dimming, and to control the dimming operation of the power supply units 17a and 17b in off dimming. The light sources 15a and 15b whose outputs change linearly are controlled to perform dimming operation.

The second dimming control function is to control the dimming operation of the light sources 15a and 15b in which the outputs of the power supply units 17a and 17b change exponentially in normal dimming, and to control the dimming operation of the power supply units 17a and 17b in off dimming. The light sources 15a and 15b are controlled so that the output changes exponentially faster than normal dimming.

As the dimmer 12, for example, an operation console (dimmer console) having faders and the like used in theaters, studios, etc. is used. The dimmer 12 and the controllers 18a and 18b of the lighting device 11 are connected by, for example, a DMX cable or a LAN cable, and a dimming signal according to a predetermined communication protocol is sent from the dimmer 12 to each of the lighting devices 11. It is sent to the control units 18a and 18b. This dimming signal includes an extinguishing dimming signal for extinguishing and a normal dimming signal other than for extinguishing.

In the lighting system 10, by operating the dimmer 12, a dimming signal corresponding to the operation is output from the dimmer 12, and the control units 18a and 18b that have received the dimming signal respond to the dimming signal. It controls the outputs of the power supply units 17a and 17b and causes the light sources 15a and 15b to perform dimming operation.

The control units 18a and 18b control the outputs of the power supply units 17a and 17b to change exponentially in the case of normal dimming other than extinguishing dimming toward extinguishing, and the brightness of the light sources 15a and 15b gradually increases. Dimming operation is performed so as to change.

For example, as shown by output curves a1 and a2 of power supply units 17a and 17b in FIG. brightness changes gradually.

During this dimming, when both the light sources 15a and 15b are turned on and set to a predetermined light color, even if the brightness of the light sources 15a and 15b changes due to dimming, the light color does not change, and the light color does not change. It is preferable not to perceive variability.

By the way, as shown in the output curves a1 and a2 of the power supply units 17a and 17b in FIG. 2 or 3, the power supply units 17a and 17b of each system may have variations in output. For example, the outputs of the power supply units 17a and 17b vary such that the output value P1 of the power supply unit 17a is higher than the output value P2 of the power supply unit 17b.

In this case, during normal dimming, in a region where the outputs of the power supply units 17a and 17b are higher than the predetermined output value P3 just before turning off, the power supply units 17a and 17b are Even if the outputs of the light sources 15a and 15b are controlled to change exponentially, the color change of the light colors by the light sources 15a and 15b is inconspicuous, and the variation in the light colors is hard to perceive.

On the other hand, during extinguishing dimming toward extinguishing, the outputs of the power supply units 17a and 17b are changed from a certain output value (for example, the output values P1 and P2) to 0, but the power supply unit 17a , 17b is about to turn off, and the output of the power supply units 17a and 17b fluctuates significantly in the region below the predetermined output value P3, and the output of the light sources 15a and 15b of the system with high output from the power supply units 17a and 17b is reduced. It becomes easy to feel variations in the light color, such as changing the color of the light.

At the time of extinguishing dimming toward extinguishing, the outputs of the power supply units 17a and 17b are changed exponentially from a certain output value (for example, output values P1 and P2) to 0. When controlled, the time t1 from when the output of the power supply units 17a and 17b becomes equal to or less than the predetermined output value P3 to when it becomes 0 becomes longer, making it easier to perceive variations in light color.

Therefore, the control units 18a and 18b determine from the input dimming signal whether the dimming is dimmed for extinguishing or normal dimming other than dimming for extinguishing. , and 17b to control the dimming operations of the light sources 15a and 15b differently, making it difficult to perceive variation in light color.

That is, in the case of light-off dimming toward light-off, like the first dimming control indicated by the output curves b1 and b2 shown in FIG. , P2) to 0, the outputs of the power supply units 17a and 17b are controlled to change linearly. As a result, the time t2 from when the output of the power supply units 17a and 17b becomes equal to or less than the predetermined output value P3 to when it becomes 0 becomes shorter than the time t1, making it difficult to perceive variations in light color.

Alternatively, in the case of extinguishing dimming toward extinguishing, like the second dimming control indicated by the output curves c1 and c2 shown in FIG. , P2) to 0, the outputs of the power supply units 17a and 17b are controlled to change exponentially faster than normal dimming (output curves a1 and a2). As a result, the time t3 from when the output of the power supply units 17a and 17b becomes equal to or less than the predetermined output value P3 to when it becomes 0 becomes shorter than the time t1, making it difficult to perceive variations in light color.

When the control units 18a and 18b receive a light control change signal, they change the current light control level from the current light control level to the changed light control level by a constant light control rate every predetermined time. is controlled according to the dimming curve that is convex downward, and when the dimming is turned off, it is controlled by a linear dimming curve from the output at that time to 0, or when it is turned off. Based on the output at that time, control is performed with a dimming curve different from the dimming curve of normal dimming.

As described above, according to the power supply device 16 of the present embodiment, it is determined from the dimming signal to be input whether it is light-off dimming toward light-off or normal dimming other than light-off dimming. By making the dimming operation of the light sources 15a and 15b by the power supply units 17a and 17b different depending on the light, that is, the control according to the dimming curve at the time of normal dimming is less than the predetermined output at the time of off dimming By controlling the time to be short, it is possible to make it difficult to perceive variation in the light color just before turning off the light sources 15a and 15b when dimming the light sources 15a and 15b.

In addition, in normal dimming, by controlling the dimming operation of the light sources 15a and 15b in which the outputs of the power supply units 17a and 17b change exponentially, the production effect in theaters and the like is enhanced. By controlling the dimming operation of the light sources 15a and 15b in which the outputs of the power supply units 17a and 17b change linearly, when dimming the light sources 15a and 15b, it is difficult to feel variations in the light color just before they are turned off. can.

Alternatively, in normal dimming, by controlling the dimming operation of the light sources 15a and 15b in which the outputs of the power supply units 17a and 17b change exponentially, the performance effect in a theater or the like is enhanced. By controlling the dimming operation of the light sources 15a and 15b in which the outputs of the power supply units 17a and 17b change exponentially faster than normal dimming, the light just before turning off the light sources 15a and 15b is dimmed. This makes it difficult to perceive variations in color.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

11 Lighting equipment
15a, 15b light source
16 power supply
17a, 17b Power supply
18a, 18b control unit

Claims (3)

a power supply unit that performs dimming operation for at least two or more light sources with different light colors;
inputting a dimming signal to control the dimming operation of the light source by the power supply unit, and judging from the dimming signal whether the dimming is dimming toward turning off or normal dimming other than dimming toward turning off; a control unit that causes the power supply unit to perform different dimming operations of the light source for off dimming and normal dimming;
with
The control unit controls the light source to perform dimming operation in which the output of the power supply unit changes exponentially in the normal dimming, and adjusts from the normal dimming to the off dimming in response to the input of the dimming signal. When the light changes, the output of the power supply, which changes exponentially, is controlled so that the light source changes linearly.
A power supply device characterized by : a power supply unit that performs dimming operation for at least two or more light sources with different light colors;
inputting a dimming signal to control the dimming operation of the light source by the power supply unit, and judging from the dimming signal whether the dimming is dimming toward turning off or normal dimming other than dimming toward turning off; a control unit that causes the power supply unit to perform different dimming operations of the light source for off dimming and normal dimming;
with
The control unit controls the light source to perform dimming operation in which the output of the power supply unit changes exponentially in the normal dimming, and adjusts from the normal dimming to the off dimming in response to the input of the dimming signal. When the light changes, the output of the power supply, which changes exponentially in the normal dimming, is controlled to change exponentially faster than in the normal dimming. power supply. At least two or more light sources with different light colors;
A power supply device according to claim 1 or 2 ;
A lighting device comprising:

Images