MicroSolar Corp. The Brightest LED Master

Contact Us:

TEL:+886-37-587561　+886-37-587562

FAX:+886-37-587563

microsolar@microsolar.com.tw

1F, No 22,Kedong 3rd Rd., Hsinchu Science Park, Jhunan, Miaoli 35053, Taiwan, R.O.C.

MicroSolar Product Brief (Download)

MR16 Spec. (Download)

The Latest Revolutionary Technology

Fig.1 LED chip and heat-sink structure

High Power LED convert only about 15 to 20% of the input power into light, the remaining 80 to 85% is lost into useless heat. The bottleneck to the current flow is mainly the gold wire connecting the LED chip to the cathode pin (see figure 1). Also, the copper slug do not provide enough heat transfer with the air to sufficiently cool the LED chip. If enough heat is not evacuated, light output is decreased and the LED lifetime is significantly shortened. An example of damage from heat is, for white LED using phosphore, the gradual vaporisation of the phosphor layer used to convert blue light into white.

A real breakthrough in LED technology have been made by our company Microsolar: a patented process allowing any LED chip to be bonded to any aluminum structure. The thermal interface and the heat sink provided by the aluminum structure are so efficient that there is no need for fan, for bulky radiators or other techniques to reduce the heat. The LED can be totally integrated to the reflector. The later fulfill therefore the role of body, heat sink and its primary function, reflector.
A current of 5A through a single LED chip, leading to an illumination intensity of 1500lumens, this illustrates well the performances of our technique. Our goal is 10A through a single LED chip.

Our technology not only? reduces manufacturing cost, but we believe it will soon make LED lightning a reality for common households. And with such an energy saving revolution, we are pleased to offer our contribution to a greener environment.

Cost and Benefits:

Microsolar patented Hot Spot Tech allows a conventional LED to be overdriven yet to retain its life expectancy.
Current limiting resistors are no more needed, neither are the use of expensive, bulky and complicated power supplies.
Some of the advantages of our technology are:

• Long life
• Low cost
• Energy saving
• High efficiency
• High light output
• No need for external heat sink

Fig.2 Current vs microsolar technology electrical performances

Microsolar research and development team focuses on material and technology allowing one to drive a single LED at 3.5V to 5V without the need for limiting resistor. Figure 2 shows how our ultra heat transfer technology compares with the current technology: the later necessitates a typical LED to be driven at 3.5V and a current limited to 350mA, leading to an electric power of 1W. Our technology allows to drive the same chip at 5V and 5A, leading to an electric power of 25W! Such a lamp can be driven by a simple transformer, even directly connected to batteries, further reducing the cost of lightning equipment since complex power supplies with constant and limited current capabilities are no more required.

Fig.3 Diagram for display of difference between old technology and new technology

The above diagram further illustrates the efficiency gain and cost reduction provided by our technology. Current efficiency is about 100lm per watt of electrical power (100lm/W). In order to achieve a 1500lumens light intensity, one would require to purchase 15 LED.

With Microsolar ultra-heat transfer technology, only one such LED is necessary.

One may argue that the power consumption would be 25W for the Microsolar technology equipped LED compared to 15W for the 15 same LED. But the cost of purchasing 15 LED is way beyond a 66% increase in electric consumption. This is without mentioning the cost to actually manufacture 15 times more LED, cost in terms of material but of course also in electric consumption at the LED factory level. Also, the power supply cost is reduced. This makes a Microsolar technology equipped LED a real green solution for our planet and a convenient idea for the consumer.

Table 1 Light Intensity and efficiency for conventional vs microsolar LED

Fig.4 Microsolar applications

Applications are, but not limited to: street lighting, video projectors, flat panel LCD back light, interior lighting, emergency lighting...

Figure 4 summarizes these applications.

Forecasts from the Yushan company sees a popularization of LED lighting by year 2020, but with microlosar ultra-heat transfer breakthrough, LED lighting could be in many households by 2012.

We call our ultra-heat transfer technology the thermal engine. It is illustrated on fig 4. The thermal engine associated with a conventional high power LED provides the light engine, a 25W lamp capable of delivering 1500lumens of light intensity.

Fig.5 Manufacturing process

Microsolar technology manufacturing process is illustrated on fig.5 . It consists of coupling in the best thermally efficient manner a conventional LED chip with an aluminum structure, the later playing the role of a heat sink.

Heat Resister

Heat resister is one of the most important evaluation factors in LED lamp component field. Its unit is C/W.

1 C/W means 1W heat will increase temperature of 1C.
Lower heat resistance means better heat conductivity, in other words, Led lamp can keep at low temperature and protect itself.

Following is the calculation of heat resistance of our LED lamp

TJ : Junction Temp. between LED package and Al heat sink = 52 ℃
TA : Environmental Temp = 20 ℃
P : Input Power =13.5W
Heat Resistance: ΘJ-A = TJ – TA / P = (52℃-20℃) / 13.5W = 2.37 (℃/W）

The position of thermal couple measuring

Products Information

MR16 LED Lamp

Aluminum is used as：Heat Sink、Reflector、Main Structure

Advantage：Light、Cheap、Good Light Shape

MR16 Spec.(download)

LED Lamp	Battery	Duration
	3 DuracellAA	18 hrs
	3 Duracell RechargeableAA	8 hrs
	Li battery	6 hrs