Supply of highly reliable power supply for LED lighting equipment

Constant current power supply is best for LED lighting power supply White LEDs are put to practical use, and most LED lighting fixtures in recent years use many LEDs. LED lamps are equipped with one to tens of LED elements, more than 100 are not uncommon. The problem when using multiple LEDs is the dispersion of individual LED elements. Even if a certain voltage is applied to the LED, the current flowing through each LED differs by several times (see the right graph).

It is not desirable for lighting to use a power supply that uses a constant voltage power supply because there will be a difference in luminance and color when there is this variation. In order to solve this, it is best to use constant current power supply. By turning on the LED with constant current drive, it not only aims at the intrinsic brightness and color of the LED, but also reduces the load on the LED, which can reduce heat generation and prolong the life. However, general power supplies are mostly constant voltage power supplies, including those for PCs. TM Link designs high-performance, high-function LED power supply based on abundant analog technology and semiconductor design skill, and it manufactures at the power supply special factory in China to ensure customer's cost competitiveness. It also corresponds to any customization required for lighting equipment (LED Vf / If, Power, equipment shape, size, dimming, dimming, toning, waterproof etc ..), while supplying power, a total solution is realized.

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TM Link light control & toning solution for LED
TRIAC dimmable LED power supply
It is a power supply compatible with a method of performing phase control (triac) with a dimmer. Even in unstable state during phase control, in order to light the LED steadily, design with power supply and LED driver configuration that are optimum for the lighting fixture. A configuration with external MOS-FETs is also available to accommodate high power LEDs.
LED power supply compatible with PWM dimming
It is a power supply compatible with the dimming method by sending a dimming signal (PWM) from the dimmer. Since the unstable part at the phase control is eliminated, it is possible to achieve smooth dimming with less flicker. However, a signal line dedicated to dimming is required separately.
PLC built-in LED Next Generation Dimming & Toning Solution
By incorporating PLC (Power Line Communication) in the LED power supply, you can control dimming, toning (in case of color lighting), ON / OFF control while keeping the shape of existing LED lighting equipment. Since the control signal of the lamp uses a power line, we can introduce the intelligent lighting system while keeping the facilities installed in the fittings intact. There are two types of power supplies: built-in bulb shape and built-in fluorescent tube shaped equipment, and external one.

Development of LED power supply to mass production - Design review

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Turn-key service of LED lighting power supply / lighting fixture

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Next-generation lighting solutions / Construction-less light control and toning by PLC

 (Note) PLC:Power Line Communications

Application example: Windowless chicken farm PLC system lighting

Even in environments where it is difficult to establish infrastructure, even in environments where existing infrastructure can not be modified, the latest system lighting can be introduced by using PLC.Since it connects everything including the network with only the power line (AC line), installation is completed with a simple laying construction.

Application example: Plant factory

As the global food crisis is anticipated, "industrialization of agriculture (plant factory)" to efficiently produce agricultural crops such as vegetables and cereals has been drawing attention.
The wavelength of the light necessary for plant growth is mainly red (640 to 680 nm) and blue (450 to 480 nm), and it is known that it is possible to control the growth rate and shape of the plant by adjusting the light amount and the irradiation time.
Recently, attempts have been made to control contained nutrients by adding light of other wavelengths in a balanced manner to this. This can be realized by taking advantage of single wavelength characteristics of LED.

LED lighting units for plant breeding research are being put into practical use that can accurately program control light balance and irradiation time in order to respond to market voices that want to specify different optimum light environmental conditions for each plant.

Application example: Fishery industry / fish lamp

Fishing lamp control - Automatic control of light sources with different wavelengths

Application to fish reacting to specific wavelengths is being used for fishery fishing lamps. Depending on fish species and harvest time, it is necessary to switch delicate wavelengths, and there is a demand for automatic control.

- Case of squid fishing boat -
Since the peak emission wavelength (450 to 500 nm) of the blue light-emitting diode (LED) is almost consistent with less light attenuation in the ocean and near the maximum value (470 to 490 nm) of the visual sensitivity of the squid type , It has extremely excellent characteristics as a fish lamp light source. Furthermore, fishing lamps using blue LEDs have the following features.

(1)	The power consumption is extremely low and a significant fuel oil saving effect is expected, bringing about improvement of management of squid fishing fishery management body and reduction of CO2 emission.
(2)	It has a long life of more than 10 years (metal halide lamp is about 2 years), as compared with the conventional light source of glass sealing structure, the package of LED is also superior in mechanical strength so it is used for severe shipboard To endure.
(3)	It has strong directivity and can irradiate 90% or more of light flux into water. (In the metal halide lamp which is the point light source, about 80% is scattered in the air)
(4)	Since stabilizers used for controlling metal halide lamps and auxiliary power generators with large output are unnecessary, it is expected to greatly reduce equipment costs and increase space inside the ship.
(5)	There is no influence on the health of the fishery by ultraviolet radiation and the influence on the environment due to light damage.

Proposal of integrated system

Next-generation LED lighting with wide application range