JP2014103078A - Led light dimming circuit for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device in which color toning and light dimming of an LED for a vehicle can be performed with one light dimming operation.SOLUTION: In a device according to the present invention, a minimum unit is configured from one LED and a control circuit connected to the LED in series, a plurality of units each of which is a combination of a control circuit with the one LED and a control circuit with an LED having a color different from the one LED are connected in parallel. The device has a function capable of simultaneously varying the light emitting colors and the brightnesses of a plurality kinds of LEDs by flowing a signal into the plurality of control circuits connected in parallel from one operation signal.

Description

The present invention relates to an LED lighting control circuit used for a vehicle and a vehicle lighting device.

Conventionally, a fluorescent lamp provided with an inverter circuit is used for lighting for vehicles. In a route bus or a sightseeing bus, dimming of the fluorescent lamp is performed by controlling the output of the inverter.

In recent years, lighting devices using LEDs have also been adopted for buses, and this type of lighting device is equipped with an LED dimming control device. The brightness in the car was changed according to the situation.

As described above, products having the function of changing the brightness of the LED have been commercialized, but products that change the emission color of the LED at the same time as the brightness changes have not been put into practical use as lighting for vehicles. .

On the other hand, home appliances are equipped with many operation buttons and multifunctional products are available so that the color change and dimming can be changed according to the scene, but in vehicles such as buses mainly lighting Since the operation is performed by the driver, many operation buttons can create various scenes, but the operation during traveling or stopping is complicated and has a safety problem.

In addition, there is only a limited space in the car, and it is difficult to place a lot of operation buttons. The countermeasure can be realized by adopting a wireless method using an infrared button or a radio wave for the operation button, but the noise is mixed into other devices, mutual interference, and cost are increased. There is a problem.

In view of the above problems, the present invention is a vehicle LED dimming circuit characterized in that it is possible to easily produce light in a vehicle interior by simultaneously realizing toning and dimming of a plurality of colors in one operation. It is.

The apparatus according to the present invention is a unit composed of one LED and a control circuit connected in series to the LED as a minimum unit, and a plurality of units of combinations of LEDs and control circuits different in color from the LED are connected in parallel. It has a function of changing a plurality of kinds of LED emission colors and brightness at the same time by flowing a signal from one operation signal to the control circuits connected in parallel.

The control circuit connected to one LED has input / output control different from that of the control circuit connected to the other LED, so that the toning and dimming can be combined with only one operation signal.

In addition, by arranging external signals such as optical sensors, it is also possible to automatically adjust the color and light control. As an example of a sightseeing bus, the daylight color can be used during the day without the driver having to operate the switch. It is possible to change the atmosphere of the interior of the vehicle by making it brighter with such a bright color and by changing the color of the light bulb color at a low color temperature at night.

As described above, the present invention can provide an illuminating device that does not require many operations and can change the color and dimming of the LED with one operation signal.

The conventional bus lighting only had a single white LED, so it was only possible to change the brightness. However, the present invention can easily change the light emission color in addition to the brightness. When traveling in the morning, leave the car brightly with white light when leaving in the morning, and create a soft and calm interior space with light bulb color light on the night return trip, so that you can heal the fatigue of the trip Passenger service can be provided.

It is a block diagram which shows schematic structure of the illuminating device and light control apparatus which concern on Embodiment 1 of this invention. FIG. 2 is a timing chart diagram of an example of a toning / dimming circuit in FIG. 1. It is a block diagram of the Example which implement | achieves toning of 2 or more colors.

FIG. 1 is a block diagram showing an embodiment of the present invention. At least one LED 3 serving as a light source and a control circuit 2 are connected in series with the LED 3, and the unit is configured as one unit and is in parallel with the unit. The control circuit 4 is connected to and connected so as to receive the signal from the operating device 1.

The outputs of the control circuit 2 and the control circuit 4 are set differently with respect to the input signal of the operation device 1. According to the output, the LED 3 and the LED 5 are turned on with specified brightness.

As a specific example, as shown in the timing chart of FIG. 2, a white LED is used for the LED 3 of FIG. 1, and the control circuit 2 connected to the white LED changes the input of the operating device 1 from V1 to V2. The white LED 3 is sometimes set so that the brightness changes from 100% to 0%.

Next, a light bulb color LED is used for the LED 5 in FIG. 1, and the control circuit 4 sets the light bulb color LED 5 so that it does not change even when the signal of the operation device 1 is changed from V1 to V2. When the signal of the operation device 1 is changed from V2 to V3, the light bulb color LED 5 is set to change the brightness from 100% to 0%.

By making the above settings, when the signal of the controller 1 is changed from V1 to V2, the white LED 3 is dimmed from 100% to 0%, and the bulb color LED 5 is kept 100% lit. When the signal of the operation device 1 becomes V2, the white LED 3 is turned off and only the light bulb color LED 5 is turned on 100%. At this time, the light is turned on with 100% light bulb color.

Thereafter, when the signal of the operation device 1 is changed from V2 to V3, the white LED remains off and the light bulb color LED is dimmed from 100% to 0%.

By performing the above operation, it is possible to change the toning and dimming only by changing one operating device 1 from V1 to V3.

In the above-described embodiment, the control circuit connected to the front stage of each of the white LED and the light bulb color LED is provided to continuously change the toning and dimming of the two colors, as shown in FIG. By providing two or more colors of LEDs and a control circuit in which input / output is separately set for each of the LEDs, multi-color toning and dimming can be realized with one operation signal.

DESCRIPTION OF SYMBOLS 1 Operation device 2 Control circuit 3 LED light source 4 Control circuit 5 LED light source 6 Operation device 7 Control circuit 8 LED light source 9 Control circuit 10 LED light source 11 Control circuit 12 LED light source

Claims (4)

An LED lighting circuit having a plurality of LEDs having different color temperatures and a plurality of control circuits, and capable of simultaneously changing toning and dimming with one type of input signal apparatus. The control circuit has at least two or more control circuits and two or more different LEDs corresponding to the control circuit, and adjusts the current that each of the two or more control circuits flows to the LEDs in response to an input signal. The vehicle LED lighting device according to claim 1, wherein the LED can be dimmed in a plurality of stages. One dimming signal whose voltage continuously changes is received by one controller, and each of the preset voltages V1, V2, and V3 (V1 <V2 <V3) is set as a change start point and an end point. An LED lighting device for a vehicle that continuously changes color and brightness by dimming light sources having different color temperatures by a dimming control circuit using a PWM control method. The LED lighting device for vehicles which can satisfy Claims 1-3 with the operation device currently used for the conventional fluorescent lamp and LED indoor lamp.

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