Fast Recovery Diode (FRD) is a semiconductor diode with good switching characteristics and short reverse recovery time. It is mainly used in switching power supplies, PWM pulse width modulators, inverters and other electronic circuits as high-frequency rectifier diodes. Free-wheeling or damper diodes are used. The internal structure of the fast recovery diode is different from that of an ordinary PN junction diode. It belongs to a PIN junction diode, that is, a base region I is added between the P-type silicon material and the N-type silicon material to form a PIN silicon wafer. Since the base area is thin and the reverse recovery charge is small, the fast recovery diode has a short reverse recovery time, a low forward voltage drop, and a high reverse breakdown voltage (withstanding voltage).
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When will the inspiration be nurtured into an industry? When will the passion solidify into benefits? This became a deep dream of Hefei.
China's first LED infrared sensor lighting - Hefei and another "China's first" appeared. In the sound of the "industrial establishment of the city", in the atmosphere of creating a "scientific and technological innovation pilot city", we deplore and walked into the world of lights with care, carefully focusing on it.
As a representative of green lighting, LED lights are the third generation of electric lights developed by humans. Perhaps many people do not know that Hefei has taken the lead in the development of LED lights. The first LED infrared induction lighting in China was designed by Hefei Sanchuan Automation Co., Ltd.
The third generation of electric lights went to green lighting
The history of human electric lights can be traced back to 1879. Edison produced the first generation of electric lamps, incandescent lamps. This kind of tungsten-emitting lamps are still in use today. Its biggest drawback is that it consumes a lot of power. watt. “The surface is very hot after lighting, and the service life is very shortâ€, which is the evaluation of many citizens. The second generation of electric lamps - fluorescent lamps (commonly known as fluorescent lamps), is to put a special gas in the lamp tube, and apply phosphor on the wall of the lamp to emit light by gas discharge. "Power saving than incandescent lamps, but with stroboscopic and electromagnetic radiation, long-term use is not conducive to eye and body health," experts from the China Lighting Association have pointed out.
In the reality of the energy crisis, the third generation of electric lights has moved towards green lighting. It is necessary to save energy and protect the eyes, and LED lights are among the best. LED is the abbreviation of LED. LED lamp is composed of many LEDs. Its power consumption is only 1/10 of that of incandescent lamp, its life span is 50,000 to 100,000 hours, and there is no radiation and heat. It is recognized as the first. The mainstream of three generations of lighting.
Insert "infrared sensing" wings for LED lights
Seeing that there may be readers here, LED lights have so many advantages, why not use them every household? The engineers of Sanchuan Company gave the answer. The original LED will accelerate the aging after a long time of lighting, and its life will drop sharply. Therefore, LED lights are now mostly used for decoration and landscape lighting, but have not been able to enter civilians that require long-time lighting. field. In order to solve this problem, the state has listed the technical transformation of LED light source as the “Eleventh Five-Year Plan†major scientific and technological research project.
In the company, the reporter saw the LED infrared induction lighting. When people approached, they will light up and leave, just like the automatic baking machine in the hotel bathroom. According to the engineer, this kind of lamp uses the principle of infrared induction on the basis of LED, which turns the long-time illumination into intermittent illumination, and subtly avoids the weakness that the LED cannot be lit for a long time. It can be widely used in long-term illumination. Places, such as underground garages, corridors, home porches, hotel corridors, etc., this is equivalent to inserting "infrared sensing" wings into the LED lights, so that they fly into the homes of ordinary people.
New products that have been "forced"
When talking about the research and development experience of this kind of lamp, the person in charge of Sanchuan Company laughed and said, "It was forced out." More than a year ago, they signed a contract with a commercial building for solar photovoltaic lighting systems. After the line was laid, they ran through the market but could not find a matching lamp. In a hurry, the company had to rush a batch of LED lights to solve the urgent need. . From the market gap, they also discovered the business opportunities and decided to develop this new light source.
After the products were put on the market, orders will come to the fore. Baoding City, Hebei Province, which has the title of “Solar Capitalâ€, has already used this product as a supporting light source for solar city lighting. What Sanchuan Company is thinking about is how to expand production capacity as soon as possible. Due to the optimistic development prospects of the company, Hefei Innovation and Technology Venture Capital Co., Ltd. has invested 2 million yuan in advance.
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The first LED infrared induction lighting in China was born in fat
Let’s say that in the past few decades, from this land, we have walked out of China’s first window air conditioner, the world’s first VCD, the world’s first bionic washing automatic washing machine, and the world’s first variable-capacity refrigerator... However, most of them, after a moment of beauty, either sway like a candle in the wind, or bloom in a foreign country, like a lonely fireworks raised by this land.