High power LED constant current source designed to drive in series

With the advent of high-power LED, general fluorescent or incandescent 5 to 7 times its luminous efficiency, energy-saving effect is very significant. Thus, the high-power LED has broad application prospects. Currently, a single high-power LED has 1W, 3W, 5W and 10W, has been heavily used 1W and 3W high power LEDs, multiple high-power LED series and parallel, the the combination output power reached 70W ~~ 100W.

High-power LED with high luminous efficiency and energy-saving advantages, but inconsistent pipe pressure drop is the need to overcome the shortcomings. Second, poor temperature characteristics of the high-power LED. Tube current and luminous efficiency varies greatly with the junction temperature and ambient temperature changes, which bring inconvenience to use.

High power LED above shortcomings, people use more than two drive options: 1. Constant voltage source driver. That is, using a plurality of LED in parallel with a constant voltage source driver. Thus, since the tube voltage drop of the LED is inconsistent, so that the diode current is inconsistent, so that the luminous efficiency is also quite different. This program is seldom used in high-power LED. 2 constant current source driver. Inconsistent pipe pressure drop of the high-power LED, LED by their junction temperature and ambient temperature influence, so the number of LED series and driven with a constant current source can effectively overcome these shortcomings.

The main features of the high-power LED

Operating wavelength
The operating wavelength of the high-power LED with its glowing colors. For example, cold white LED operating wavelength of 525 angstroms to 600 angstroms, while warm white LED operating wavelength between 525 angstroms to 675 angstroms.

Forward voltage drop
High power LED's forward voltage for each change of 0.1V, the current change of about 100mA.

The relationship of the working current and luminous intensity
The high power LED luminous intensity of its junction temperature and ambient temperature. This is mainly due to temperature increases, the operating current is also reduced correspondingly, Similarly, LED's luminous intensity and its current relationship is approximately linear, and its working current each reduction 100mA for 1W and 3W LED, the light emitting intensity is reduced about 15%.

High power LED series constant current

The principle of the source drive
Currently appearing on the market of high power LED series drive has its limitations, typically three to six LEDs in series, and the number to be sure, can not be any connection. In this paper, an arbitrary (1 to 20) LED constant current source driver program series, shown in Figure 1, the following works:

1W LED, for example, the rated current of 350mA. For some reason, the LED current is reduced, the constant current source circuit of the acquisition to the current value of the change (decrease) after having amplified by U1 transmission to the control circuit. Inversion processing in the control circuit of the sampling signal, the output pulse width is increased. Power tube D5 conversion stage of the driving power of the output pulse width increases, so that the secondary output voltage increases. In this way, the voltage across the LED in series also increases, therefore, the current flowing through the LED is also increased, which maintain a constant LED current. Similarly, if for some reason, so that the LED current is increased, contrary to the control process. Advantages that: The constant current source drives regardless of the LED voltage drop difference Junction ambient temperature changes cause changes in diode current much, can be accessed through the rapid adjustment of the high-speed constant-current source circuit to Maintain constant current LED.

High power LED constant current source
To pay attention to the design of the drive

The design of high-power LED constant current source drives should pay attention to the following points:
1. To select the control of the control chip of the circuit in accordance with the number of the LED series. Because of the number of LED chips required output power is different. Figure 1 ICE 2A165, also choose other similar switching power supply control chip.

2. Switching power supply transformer leakage induction is as small as possible, otherwise the drive will reduce the reliability. Because the leakage inductance of the transformer, switch off instantly produces very high reverse voltage spikes, severe cases may exceed the breakdown voltage of the control switch, leaving the LED chip breakdown, causing the reliability of the drive is greatly reduced. Switching power supply transformer T1 is the key parts of the product, it is necessary to the production of the professional manufacturers.

3. The operating speed of the constant-current source circuit to be fast, so that can make the LED safer. In this paper, series of LED drive any number (1 to 20) of the series, this would require the change of the output voltage of the switching power supply faster to adjust slowly, and may cause damage to the LED's.
Practice has proved that this paper, high-power LED constant current source drives the program is feasible, and compared with other drives, lower cost, which has broad application prospects.

Variety of LED Lighting Products Debut Guangzhou International Lighting Fair

Guangzhou International Lighting Exhibition is the world lighting industry leader, the top companies in the world, the latest products and technology in this together. Here, you can see the dynamic of the fluctuations in the world economy brought about by changes in the market, import and export situation of the most comprehensive in the industry. 2012 Guangzhou International Lighting Exhibition scale of 220,000 square meters, over 2600 exhibitors.

The participating enterprises covers the Netherlands, Philips, Osram, Germany, Lang, Austria ESTO Tridonic, Fumagalli Italy, Korea, Seoul Semiconductor, Samsung and other internationally renowned companies. Domestic famous enterprises Qi Pu photoelectric , diligence, optoelectronics , country star photoelectric MOSO Lehman photoelectric, TCL also debut debut.

Qi Pu Optoelectronics, Shenzhen sub Co., Ltd. to bring a variety of quality products from June 9 to 12 in 2012 to participate in the exhibition, praise by the customers at home and abroad. Qi Pu photoelectric participating products: LED fluorescent light series, LED High Bay Light, LED Jaws cast aluminum enclosure series.

Sarkozy general lighting fluorescent lamps, the lead through UL, TUV, CE, PSE, FCC certification for the international market, more persuasive. Qi general lighting fluorescent lamp LED Free modified dimming Series, LED UL, TUV lamp series, LED lamp panel series, which is characterized as follows:
1, The light source with high brightness 3528 SMD LED life of up to 50,000 hours.
2, Voltage range AC100-285V, applies to traditional mains voltage, stable and reliable performance.
3, High luminous efficiency of 100 lm / w than ordinary fluorescent lamp 70% energy saving, low- light decline , high CRI, low color drift.
4, Non-dimming series, built-in constant current switching power supply, quick start, no noise, lights flicker-free; dimming series, built-in constant current power supply modification-free dimming, flicker-free dimming dimmer compatibility .
5, Light appearance, fashionable, easy to transport.
6, Applicable to all types of living spaces, such as: home, villas, hotels, guest houses, beauty shop, cafe; shopping malls, museums and other lighting products can also be used by.

Qi general lighting newly developed LED mining lamp, energy saving and environmental protection, suitable for large-scale factory production workshop, large supermarket, warehouse, toll stations, gas stations, exhibition halls, gymnasiums, indoor and outdoor public places, such as lighting.
LED mining lamp characteristics:
1, Excellent explosion-proof performance, the use of a variety of flammable and explosive safety.
2, Using imported LED chip LED package structure optimized to achieve low- light failure , high luminous efficiency, energy saving and environmental protection advantages.
3, Crystal clear light distribution to meet the lighting needs of different occasions.
4, The use of pass-through structure design to optimize heat dissipation structure to ensure the life of the lamp .
5, The lighting angle locking device to ensure that the perspective of long-term work in the vibration environment is still not change.

Voltage range: AC85-265V, applies the traditional City voltage, stable performance, reliable.
7, Light body with light alloy material, sealed and special surface coating to ensure that lighting never harsh environment such as humidity, high temperature corrosion, never rust.
8, Can be seated and pendant variety of installation methods.

Series of the Qi Pu photoelectric Jaws, many times at home and abroad to participate in the exhibition, the technology is quite mature, by new and old customers praise. Jaws of ultra-thin aluminum enclosure has a unique look and lightweight disassembly unique in similar products, mainly applicable to leases and hoisting occasions. Its main features are as follows:
1, The use of cast aluminum, the great advantage in terms of weight, portable box.
Cabinet strength, die-cast aluminum housing with high-pressure forming mold, high strength than Aluminum Sheet metal bending.
3, Beautiful appearance, high precision die-cast aluminum casing molding, attractive appearance, Dimensions.
4, Flatness, molding, die-cast aluminum body by the mold box size under strict control, very good flatness, which can effectively reduce cabinet splicing gap.
5, The high efficiency of die-cast aluminum casing die, basically mechanized operation, greatly shortening the production cycle.

Chinese Industrial Switching Power Supply Market Development Analysis

According to the latest survey report JFUnited Consulting Co., Ltd. (JFUnited) "2007 Chinese industrial switching power supply market research report "data show that in 2006 China's industrial switching power supply market size of $ 6.7 billion; view from the installation of 2006 industrial field flatbed switching power supply and rail switching power supply products accounted for 66% and 34% of the total market size; classification from the applications point of view, the three major areas of mechanical, electrical and rail accounted for 90% of the switching power supply market in the industrial field , two major areas of mechanical and electrical accounted for 80% of the overall size of the market.

Under JFUnited survey report data show that in 2001-2006, accounting for a major share of the domestic industrial switching power supply manufacturers, such as the growth rate of the major manufacturers of Chaoyang, Ming-wai, Heng Fu average between 15% -30%, but from the entire the industry point of view, the industrial switching power supply did not achieve the expected growth rate of industrial switching power supply market growth rate is much lower than in the communications and home appliances, computer field, the 2001-2006 industrial power growth rate maintained at 10% -15 only % increase in range. In addition, JFUnited survey report pointed out that the domestic industrial switching power supply 2005-2006, the overall market growth rate of slightly more than 30 percent are optimistic about the development of the industrial switching power supply market, and in 2007. With the rapid development of the power rail switching power supply module switch, as well as the emergence of new technologies, the switching power supply of the domestic market structure will change, switching power supply manufacturers at home and abroad the expected growth rate is locked in the 20%, JFUnitedthat industrial switching power supply with a flatbed future pace of development will be maintained at about 20%, the rate of growth and the level of development of China's industrial switching power supply is much lower than in Japan, the United States, Europe and other places.

Foreign companies such as ABB, Omron, Siemens, Phoenix and other major rail products production and sales-based representative of the domestic companies such as Chaoyang, Ming-Wei (Taiwan), Heng Fu Dechuang, three groups such as the production of flat switching power supply based. In addition, foreign companies, in addition to electric Shenglan switching power supply and a few other enterprises in mainland China to set up factories, most of the imported form of sales in the mainland, on the marketing model, industrial switching power supply enterprises showed the coexistence of both agents and direct mode.

The survey report data shows that the main enterprise market scale performance switching power supply for industrial use, the top four only Chaoyang a domestic enterprise, while the other three are foreign-owned enterprises (including Taiwan), and the sunrise is not obvious advantage than the other three companies other domestic enterprises are mostly kept at a moderate level. Industry sales volume before four in Chaoyang, electric Shenglan, Ming-wai, Omron four companies market share accounted for the entire industrial switching power supply market share of 48%, indicating that the industrial switching power supply industry market concentration is already high, The development of the market is more mature level of development. The top ten enterprises in the total domestic enterprises and foreign-funded enterprises the total ratio of 1: 1.5. As can be seen, is currently lagging behind in the domestic industrial switching power supply market, domestic enterprises largely foreign-funded enterprises.

Industrial switching power supply on the price performance of the various manufacturers, JFUnited report pointed out that the price level differences between different power supply manufacturers of similar specifications (the same power and output voltage) is large, the gap in the times to ten times ranging; addition, the same company due to the number of certifications and the types of differences, the same specifications, product prices will have a very different, or the same company lead to huge price differences due to the different positioning of product applications, such as the Chaoyang military grade switching power supply industrial grade and commercial-grade switching power supply 1.5 -3 times the price difference.

JFUnited future domestic industrial switching power supply industry key competitive factors analysis in the survey report pointed out that domestic enterprises engaged in industrial switching power supply, there is a gap with foreign enterprises in terms of the overall size of the product and the product range is impossible to take into account all industrial field, strengths focus on their own areas of expertise, such as Wuxi Yufeng focus in the power industry, with international enterprises from the extension of the high-end market to the mid-market, and increase the impact of domestic enterprises, domestic enterprises to keep existing position to become the primary task, whether further market segmentation to increase the advantages of a combination of resources, the biggest challenge for domestic enterprises in the future development.

With the implementation of the Chinese localization development strategy the electric Shenglan, Omron international industrial power giant, and mergers and restructuring of domestic enterprises, industrial switching power supply products in China highlights the advantages of strategic marketing and cost, not only for the domestic enterprises impact, will further to usurp other high-end foreign brands in the field of market share.
From the point of view of industrial switching power supply market segments, electricity, railways, military, aviation and other fields, mainly monopolized by a small part of the power supply supplier, so that the characteristics of the market in the short term will not change much, the terms of industrial areas, involving products and The environment is more complex, each vendor has different proportions involved in the future, as technology and product development of the various suppliers, market share may be a larger change, Industry development level is good or bad development is particularly important for industries and enterprises, with the rapid development of power electronics technology, a variety of electronic and electrical equipment in the field, program-controlled switchboards, communications, electronic testing equipment power supply, power control equipment, etc. are widely used switching power supply, switching power supply showed alternative linear and phased power trend, the future development of space will reach or exceed the expected level, will determine the speed of development and the future trend of industrial switching power supply enterprises.

In product quality and technically domestic enterprises and foreign enterprises can not want to comparable, but because of China's cheap labor and raw materials, products price plays a very big advantage. This makes the overall size of the domestic small private enterprises also occupies 20% of the size, price and cost factors in the short-term is still one of the most important factors of the domestic competition.

Compared to domestic and foreign companies lose a considerable level in the process, the domestic switching power supply enterprises in size and value, compared with foreign enterprises. Also got some independent technical process, but mainly on a small device products. Rely on foreign technology but also in large-scale device chip technically in the Pearl River Delta region, despite a large number of Taiwanese and Japanese companies to establish production line, but the main chip technology or foreign control. Future competition, an independent technology is the key to switching power supply enterprises to master and expand the market.
JFUnited investigation report concluded that the gap the domestic switching power supply enterprises and foreign-funded enterprises also business development capabilities. Most external channel scarce resources, can only wait for customers to come to the U.S. and European companies with more complete and timely demand information channel network marketing ability is far stronger than domestic, domestic enterprises and foreign-funded enterprises, the prevalence of consciousness is not strong, and do not pay attention to the phenomenon of the relationship to maintain customers. Even some small businesses too pursuit of economic efficiency, while ignoring the related services, such as product quality assurance and after-sales service, the enterprise should bear social responsibility. This result must ultimately is The enterprise customer complaints more and more, and finally out of the market. Future competition, marketing ability and awareness is also an important factor of the enterprise development.

US-exposed Chinese top nuclear submarines: U.S. military is difficult to detect

United States, "Strategy Page" website published an article, "It's out of there quietly, very quiet (It'sQuietOutThere TooQuiet)", the article describes each of the diesel-electric submarines and nuclear submarines advantages and disadvantages, cited the country against the United States, China, Iran and North Korea, the three submarines use to disclose details of the lease Swedish submarine anti-submarine warfare tactics and equipment in the United States.

The U.S. Navy still argue the operational effectiveness of conventional submarines, as well as whether to buy conventional submarines. This happens for two reasons, one, the current U.S. Navy may not be able to maintain 40 to 45 attack submarines, the quiet performance of modern diesel-electric submarines stronger than nuclear submarines, especially in coastal waters. The use of the modern passive sensor supplier, a diesel-electric submarines underwater movement is the best weapon to attack other diesel-electric submarines. -Sea combat nuclear submarine is more suitable, in particular the need for the long voyage to reach issues waters, but the diesel-electric submarines in the coastal waters with a battery-powered voice is very small, it is difficult to be detected.

Currently, there are 39 countries equipped with approximately 400 diesel-electric submarines, but only China, Iran and North Korea against the United States and its allies plan to use its submarines. China has 50 diesel-electric submarines, Iran and equipment 3 (additional 25 mini-submarine), North Korea has 20. The United States must be considered against 73 diesel-electric submarines and 75 mini-submarines, more than half of these submarines, old and obsolete, voice, only 36 full-size submarines and 40 mini-submarine can be a real threat to the U.S. military, but if taken lightly, old submarines You can also pose a threat. Therefore, East Asia and the Persian Gulf region is a dangerous place for U.S. warships.

The past 10 years, the U.S. Navy has been assessing the submarine threat facing, from 2005 to 2007, the United States leased a Swedish Submarine (Swedish only equipped with a five submarines), employ a submarine crew want to set in the imaginary enemy as an exercise to help U.S. anti-submarine forces to study the anti-submarine tactics, and as a preferred mode of training. Sweden's Gotland (Gotland) class submarine displacement of 1500 tons, 64.5 meters long (200 feet), containing members 25 are generally small submarines, currently moored in San Diego, a 36 U.S. organizations responsible for the maintenance of the submarine maintenance.

Before the introduction of the "Gotland class submarines, the U.S. Navy has been using the Australian submarine training often fails, but the submarine. "Gotland" class submarines equipped air independent propulsion system (AIP), the good performance of underwater noise reduction, longer battery life, so similar to the face and the future of the U.S. surface ships or submarines opponents. Opponents such as Iran and North Korea are not equipped with AIP submarine, but has enough diesel-electric submarines, the crew trained, quite deadly threat.
Based on the lessons from Australia and Sweden submarines, the U.S. Navy has secretly developed a new anti-submarine tactics and equipment, confirm that the modern diesel-electric submarines still the main threat of the U.S. surface ships and submarines. Potential opponents at the same time, the construction of more affordable diesel-electric submarines, being trained crew tracking the ability of American warships. The increasing number of enemy submarines, diesel-electric submarines of the United States in offshore search and there are technical problems, so the defense of the United States has been in the "limp".

China plans to exclude the U.S. Navy in its exclusive economic zone beyond its submarines have received anti-tracking training, U.S. submarines, surface ships and aircraft difficult to detect Chinese submarines. Currently, some aquatic species due to environmental organizations protest sensor manufacturer used by the U.S. anti-submarine training injury, the U.S. Navy lost underwater anti-submarine warfare training venues in Southern California.

Meanwhile, China is to increase investment in military construction, the threat of North Korea and Iran's fleet is declining. Therefore, if the U.S. Navy must pay special attention to the development of some of the diesel-electric submarines, they must be in China. Now, China will continue to develop a world-class nuclear submarines, but also did not give up the construction of a world-class diesel-electric conventional submarines.

6.45MM World's Thinnest! TCL Refresh Smartphone Slim World Record

As a human challenge the limits of a way, the phone thin and 100 meters world record, has been constantly refresh our awareness. December 4, 2012, TCL Communications the brand conference Upload to news, the latest products TCLS850 6.45MM create smart phone the ultrathin record, and for a time became a sensation in the global mobile phone industry's big news.

The slim phone means that the use of lightweight and fashion appearance, has always been the relentless pursuit of the mobile phone industry. REVIEW functional machine era, an ultra-thin V3 has swept the globe, to help Motorola achievements dominance era; IPhone4 after, ultra-thin design again rise in the smart phone market from hopeless. Smart phone in the end can do more thin? This topic has not been determined, the only certainty is that people see the ultra-thin record time and time again to be broken. Today's ultra-thin contest is one hundred meters just as World War, meter record measured in hundredths of a second, the thickness of the smartphone record has reached the level of 0.01MM, 7.1MM, 6.8MM, 6.65MM ...... after the decimal point every change represents yet another breakthrough in the scientific and technological strength, represents a business climbed to the peak. TCLS850 emergence of the phone ultrathin record leap straight 6.45MM TCL Communications finally standing on the podium of the ultra-thin cell phone records to become the top players in the field of Global slim phone, which undoubtedly is TCL The victory is also a victory of Chinese mobile phone companies.

Ordinary consumers, the thickness of the phone is just a very simple data, people who understand the smart phone industry, its meaning is difficult to use a few words speak clearly, because the slim phone is actually an international top industrial standards embodied. To use the phone so thin, the phone companies must have the strength of both hard and soft, hard power, including the battery , touch screen , camera, connectors, speakers, etc.; soft power including architecture design, thermal design, new materials technology, simulation technology, mechanical processing ... in fact, the phone thinner, more on research and development capabilities and material requirements "metamorphosis", you can say to a certain extent, the the phone minimum thickness just represents the upper limit of the enterprise's comprehensive strength. In this sense, the introduction of the world's thinnest smartphone is undoubtedly a Declaration, but also a challenge to the world that they are strong enough. Foreign brands phone robbery market profits under the status quo, this Declaration is particularly meaningful for the domestic mobile phone industry.

As ranked seventh in the world mobile phone company, TCL Communication huge success overseas, has been to become a the smartphone leader responsibility, but the two months prior to the conference of its brand, TCL's new product releases very little So there are a lot of people in the industry sent questions: TCL how could no big move for so long? Indeed, as the writer Feng Tang said, his writing is in order to eliminate the swelling of the heart, TCL also own heart swelling to eliminate, and that is its strong R & D: worldwide, TCL has, including the Silicon Valley of the United States, in Milan, Italy France Paris, Shenzhen, Shanghai, including the eight product R & D, design centers, product development personnel more than three thousand, so powerful team how could such thing as a free cooked rice? Conference of the new brand, along with a new brand manifesto "better achievements, TCL Communication of 12 new products debut, the answers to the people this time since doubts. However, many people also "got it right at the beginning, but did not guess the outcome" - think of TCL there will be a large number of new products launched, but did not think the phone ultra-thin record.

Carefully concern TCLS850 also find this phone connotation than in the ultra-thin, and the market normalizing the several slim phone S850 4.7-inch HD screen resolution of 1280 × 720, can be said to stand out; TCL specific nano waterproof fingerprint technology is unique to this one; 4.5 seconds faster boot further thin the icing on the cake ...... a world record is sufficient to Swordsman, but TCL did not meet, but also to the many differentiated The selling point to consolidate market advantage, which show up, may be the ambition of its campaign to market. All in all, for the smart phone market in 2013, TCL Communication's performance is definitely worth the alert to all opponents.

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DC motor drive electromagnetic interference issues highlighted

At present, China's electric vehicle drive system is used in the DC motor drive system, DC motor has the advantages of simple structure, high control performance, wide speed range, the control circuit is relatively simple, low cost, energy transmission is the use of one-way transmission mode, the battery to the power converter to drive motor, such models exist many deficiencies. The one-way power transmission so that the vehicle brake when decelerating or coasting downhill wasted a lot of energy. In addition, there exist the following disadvantages:
　　
1, Brush DC motor due to the presence of a reversing machinery parts brush and commutator, easily lead to spark, noise and vibration, electromagnetic interference problems
　　
2, Brush and commutator maintenance more difficult, short service life
　　
3, In the volume of the motor is very huge, resulting in limited space waste
　　
4, Brushless DC motor rotor position detection is difficult, the price is high, and the cost is relatively low

Electric vehicle motor drive system is a kind of torque control system, the driver needs to control the torque to realize vehicle starting, acceleration, deceleration and a series of operations, and need regular maintenance, and maintenance more difficult, and to generate sparks, especially on radio interference, and the future of electric car will enter the highly intelligent era, electric vehicle motor driving system of these shortcomings will be fatal weakness.
　　
In addition, the DC motor of high manufacturing cost, large weight, high energy density, therefore, will hinder the DC motor supplier in electric vehicle application. In the era of new energy, energy saving of the electric motor drive system will become the mainstream of the future, in the high efficiency, low loss, high reliability of the products will lead the market development, we hope that, with the development of technology and the progress of Chinese market, there will be more and more high performance, environmentally friendly products.

Vishay's integrated IR emitter and sensor ADC

A few days ago, Vishay Intertechnology, Inc. (NYSE ticker symbol: VSH) announced the launch infrared emitter photodiode, signal processing IC and 16-bit ADC integrated into small size 4.85mmx2 The .35 mmx0.83mm surface mount package fully integrated proximity sensor --- VCNL3020, expand its optical electronic portfolio. Space-saving VCNL3020 support easy-to-use I2C bus communication interrupt function, the the integrated transmitter driver can expand the sensor's detection distance.

16 bit effective resolution of VCNL3020 device during proximity detection can well resist crosstalk, a mechanical grating does not need to be added between the emitter and detector. Only detect objects within 100mm performance compared with other products, Vishay this sensor uses 10mA ~ 200mA (10mA increments) programmable LED drive current, the detection range is extended to 200mm. Using integrated transmitter driver to drive an external transmitter, the detection range or even more than one meters. Meanwhile, VCNL3020 modulated on the transmission signal, having excellent resistance to ambient light.

The device interrupt function of the sensor to be able to work independently, until the occurrence of a programmable threshold event, and then wake up the microcontroller. This helps consumers to reduce their consumption of software to reduce power consumption by reducing the polling traffic between the sensor and the microcontroller.

VCNL3020 can be used as a touch screen panel lock proximity sensor for smart phones , touch screen phones , PDAs, GPS units and digital cameras and other mobile devices, to achieve the purpose of saving power. The device can also be used as computing, industrial equipment and display optical switch.

Device standby current is only 1.5μA, the power supply voltage of 2.5V to 3.6V I2C bus voltage of 1.7V to 5V. Sensor Operating temperature -25 ℃ ~ +85 ℃. VCNL3020 comply with RoHS, samples will be provided with November 2012, mass production in March 2013, supply period of eight weeks for larger orders.

VISHAY Profile
Vishay Intertechnology, Inc. Fortune 1,000 companies listed on the NYSE (VSH), is the world's largest manufacturers of discrete semiconductors (diodes, MOSFET and infrared optoelectronic devices) and passive electronic components (resistors, inductors, capacitors) one of the largest manufacturers. These components can be used in the industrial, computing, automotive , consumer, telecommunications, military, aerospace, power supply, and medical markets in almost all types of electronic devices and equipment. Its product innovations, successful acquisition strategy, and "one-stop shop" service have made Vishay a global industry leader.