In China with independent intellectual property rights of LED application technology advanced in the world

Posted on April 28, 2012 by admin

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LCD display modules – China Manufacturer
Thank you for inquiry my LCD display modules, Tel： +86-571- 85121224, E-MAIL：sales@tsingtek.com
http://www.china-lcdmodule.com/

Research and development level of China s semiconductor lighting technology continues to improve, the application of LED technology with independent intellectual property rights is advanced in the world.

LED production need the sapphire substrate, not only the high cost, limited to the large size of the LED. In China, the first in the production of silicon as the substrate of the LED technology to achieve large-scale industrialization.

Chinese Academy of Sciences, Institute of Semiconductors, lighting R & D Center, deputy director Wang Junxi: silicon is much cheaper, the price of the silicon substrate is about a quarter to a fifth of the sapphire is very cheap.

LED lights can not only lighting, but can be repellent, even for medical secretary general of the China Semiconductor Lighting Industry Alliance, Ling pointed out that:

Wu Ling: the birth of a child with LED blue blanket on a package, do not put the incubator, less than two hours, jaundice, back, skills, has also resumed. Burns with LED plaster apply a scar will be reduced. LED made of copper to be without wires. It will change the business model.

Vice Minister Cao Jianlin pointed out that in 2015 China s LED lighting applications market will reach 500 billion yuan. Will be energy saving and emission reduction produced a tremendous role in promoting:

Cao Jianlin: semiconductor lighting enter 30% of the public lighting market to achieve annual energy saving of 100 billion degrees.

 

   
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The semiconductor laser marking machine, CO2 laser marking machine

Posted on April 24, 2012 by admin

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Joke Shock Flashlight – China Manufacturer
Thank you for inquiry my Joke Shock Flashlight, Tel: 86-0577-86573661, E-mail: wzsldz@laserkeychain.com
http://www.laserkeychain.com/key-joke-shock-flashlight-37/

 The semiconductor laser marking machine, CO2 laser marking machine
  Laser marking machine marking metals and a variety of non-metallic materials. More suitable for some of the requirements of more sophisticated, higher accuracy of the occasion. Including electronic components, integrated circuit (IC electronic resistance), electrical appliances, mobile communications, hardware, tools, accessories, precision instruments, eyeglasses and clocks, jewelry, accessories, auto parts, plastic buttons, building materials, PVC pipe and other industries and materials.
  Range of applications and the use of laser marking machine:
Semiconductor laser marking machine features: a light source used in the semiconductor array, so light, very high conversion rate, heat loss low; without a separate equipped with a cooling system; low power consumption. Stable performance, the krypton lamp replacement, supplies, maintenance-free.
  CO2 Laser Marking Machine features: the use of foreign advanced and stable CO2 laser tube, expanded beam focusing optical system and high-speed galvanometer scanners, stable performance, long life, maintenance-free. Can be used in electronic components, electrical components, pharmaceuticals, food, handicrafts, leather products, plastic products industry standard engraved marking, the characters are clear and beautiful, does not wear out. Laser marking machines use a specialized laser marking control software, supports Autocad, Photoshop and other graphics software, the system is powerful, easy to operate.

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Laser precision welding processing technology

Posted on April 21, 2012 by admin

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5 in 1 laser keychain – China Manufacturer
Thank you for inquiry my 5 in 1 laser keychain, Tel: 86-0577-86573661, E-mail: wzsldz@laserkeychain.com
http://www.laserkeychain.com/key-5-in-1-laser-keychain-29/

 Electronic components required in the manufacturing process of spot welding, seal welding, stitch welding, the components continue to miniaturization, small solder joints, high strength welding, the welding heat affected zone around small. Traditional welding process is difficult to meet the needs of the laser welding can be achieved. CRT electron gun assembly using laser welding technology has greatly improved the quality of the color picture tube production line almost all equipped with a pulsed laser spot welding. Word of the computer keyboard keys reed hit the life of the laser welding process allows more than 2 million times. Small aviation Relay, laser seal welding process, the leak rate is reduced. Optical communication in many coaxial devices, such as optical isolators, fiber couplers, in order to ensure that the optical signal attenuation is less than 0.1db over the circumference of the device in the welding distortion is less than 1μm, the center offset of less than 0.2μm . Thus must be synchronized along the circumference welding, laser very easy after beam through the optical fiber transmission of multi-point synchronization processing, energy can be precise control to solve the difficult problems of traditional processing methods.

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2011 sand making equipment the development of a new trend

Posted on April 19, 2012 by admin

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mobile crusher plant – China Manufacturer
Thank you for inquiry my mobile crusher plant, Tel:86-371-60130026 E-MAIL:market@hnyigong.com
http://www.enchuangxin.com/key-mobile-crusher-plant-15/

The development of the sand making equipment is far ahead of China\\ s machinery manufacturing occupy the peak of China\\ s total income of the middle of the total revenue amount of sales of machinery and equipment production has now reached 75%, than the total amount of income more than 25 percent higher, with the development of this trend, I conducted a detailed study of machinery and equipment.
      The study found that the machinery and equipment, sand making equipment the current development trend is quite good, sand making equipment is extremely broad, it can be used in construction, cement, refractory, higher road, railway, water conservancy, airport, metallurgy and other industries production, due to the continuous advancement of science and technology, our road and rail facilities in the most advantage of the development, use of equipment are also selected the most outstanding of the sand and gravel production line industry.
      According to the present trend of development of the sand making equipment, sand making equipment, new research and development, and now I manufactured by sand making equipment, such as: metal crusher, hydraulic cone crusher, iron ore crusher counterattack crusher, hydraulic crusher, straw crusher, sand washing machine, sand making equipment, river gravel, sand making machine, rod mill Sand, Sand Accessories Sand hammer, the third generation sand making sand system equipment.
      New energy-efficient Sand aggregate production process – design dedicated high-speed (high grade) highways, high-speed railway, hydropower industry aggregate production of the new sand and gravel crushing and screening production process; the crushing and screening equipment installation divided into fixed, semi-mobile (sled) and mobile crushing station three, the production capacity of 30-500 t / h refined grain size and level with the user needs may be, typically 0.40mm; production finished aggregate gravel gradation and grain shape is good, elongated particle content can be controlled within 5%, successfully used in the (State) West (An), Wu (Chinese) Canton (state), stone (Chuang) too (former) high-speed passenger rail lines, Shenda, even Huo, Beijing-Zhuhai, Beijing and Shanghai, the Grand Canal, south one hundred, Xiamen, Guangzhou Pakistan, the Shanghai-Kunming highway, the Baoquan reservoir, Red Flag Canal Reservoir, the Gezhouba Tianwan River national point of power plants and other projects. Sand work characteristics: (1) simple structure and low cost; (2) of the impeller and the whirl crushing chamber materials since the liner to substantially reduce the cost of wear parts and maintenance workload; (3) energy efficient, high crushing efficiency ; (4) can be broken in the hard, extra hard materials; (5) operation and maintenance, easy installation; (6) cubic shape, a small iron pollution; (7) has a crushing and coarse grinding function; (8) through a non-broken materials ability, material moisture affect the water content of up to 8%; (9) of noise below 75 decibels (dB level); (10) light weight, ways to install movable installation.

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Analysis of transformer oil leakage and the reasons

Posted on April 19, 2012 by admin

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Transformer Supplier – China Manufacturer
Thank you for inquiry my Transformer Supplier, TEL: 0086-577-62767791, E-mail: frank@chinesetransformer.com
http://www.chinesetransformer.com/

Equipment leakage concept: there are traces of oil for oil leakage, oil beads drop by for oil spills. Oil seeping seepage point, oil dripping for general leak, the oil one drop every five minutes for a serious leak.

    When the leakage of transformer oil level is below the gas relay, light gas protection action will cause alarm; air cooler vent plug and radiator leakage or lower oil purifier, submersible pump seal is not good to start the air cooler to the transformer within the absorbent intake phenomenon in weight from light gas protection will be action at the same time so that the transformer insulation to reduce; sleeve catheter leakage, resulting in the lead and winding turn insulation to reduce, thereby causing the burning transformer interturn short circuit.

    Transformer oil leakage for two reasons: First, the tank and pipe joints, tank box weld leakage.

    Common specific parts of the transformer oil leakage and for the following reasons:

    1, the system of valves, butterfly pad material is bad, bad installation, drain valve accuracy is not high thread at the leakage.

    The high voltage bushing base CT outlet pile head pad at the seal or inelastic, resulting in the leakage of the wiring trailer coupling pad at. Small insulator rupture, resulting in leakage.

    3, the pads do not seal resulting in leakage. General pad should be kept compressed to 2/3, there are still a certain degree of flexibility, with running time, temperature, vibration and other factors, the pad is easy to aging cracks loses its elasticity. Failed installation of the pad material, location, asymmetric, eccentric, will cause the pads do not seal.

    4, poor design and manufacture. Elevated high voltage bushing seat flange, fuel tank exterior tank chassis Dafa orchids, welding, because of some blue material is too thin, rough machining, resulting in leakage of oil.

 

 

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Over the three major problems after the load transformer main

Posted on April 19, 2012 by admin

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Main Power Transformer – China Manufacturer
Thank you for inquiry my Main Power Transformer, TEL: 0086-577-62767791, E-mail: frank@chinesetransformer.com
http://www.chinesetransformer.com/key-main-power-transformer-12/

 Main transformer overload, there are three big problems:

    1, the transformer losses increase: because the transformer is designed according to the rated capacity, the economic operation of the balance point in about 67% when the transformer load exceeds the rated capacity, the transformer copper loss will be a sliding scale by the square of;

    2, the transformer output voltage is reduced: exceed the transformer s rated capacity, the transformer secondary output voltage will be reduced when the output current reaches the short circuit current, the voltage will drop to zero;

    3, the life of the transformer to reduce: oil-immersed transformer windings are more Class A insulating materials, its heat-resistant temperature of 105 degrees, more than this temperature, makes the insulation material is aging rapidly, and long-term overload operation, the transformer will overheat even burned.

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The difference between oil-immersed transformers and dry type transformers

Posted on April 19, 2012 by admin

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Power Transformer Company – China Manufacturer
Thank you for inquiry my Power Transformer Company, TEL: 0086-577-62767791, E-mail: frank@chinesetransformer.com
http://www.chinesetransformer.com/

 Both are power transformers, will have to make the core of the magnetic circuit for the winding of the circuit.

    The biggest difference is in the \"oil\" type \"dry\".

    That is both the cooling medium, the former transformer oil as a cooling and insulating medium, which is air or other gases such as SF6 as a cooling medium.

    The oil-immersed transformer core and winding body is placed in a tank filled with transformer oil. Dry-type transformers often casting the core and windings with epoxy encapsulated together, but also a much more non-encapsulation type windings with special insulating paper impregnated with a special insulating paint, etc., serve to prevent the winding or core moisture.

    The production and use, dry-type transformer voltage levels only done 35kV, the relative capacity of the oil change is small, about done 2500kVA manufacturing process due to the dry-type transformers with the capacity of oil relative to the same voltage level change is complex and costly.

    From the amount of oil-immersed transformer. However, environmental resistance, flame retardance, impact, and so the advantages of dry-type transformers, commonly used in the indoor high demand for power distribution spaces such as hotels, office buildings, high-rise buildings and so on.

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shut-off valve selection tips

Posted on April 14, 2012 by admin

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globe valves – China Manufacturer
Thank you for inquiry my globe valves, Tel: 0086-21-57609959, E-mail: sales@nf-valve.net
http://www.nf-valve.net/

Cut off the requirements of the regulating valve in the applications will require a higher cut-off function is an important control valve functions and the intrinsic quality indicators (see related information) to cut off the division level and standard. In the field, often the control valve to cut off a bad leak and large fault. Due to lay a trap, allowing the pressure is too small to open the top and other causes of increased leakage, the vast majority are caused by the regulating valve structural defects and improper selection.

1, the choice of structure type: in effect cut off valve, rotary valve stroke than a straight (such as single-seat valves, sleeve valves, gate valves, etc.) structure is more simple, more reliable sealing effect, and has more advantages. More representative of the three eccentric hard sealing butterfly valve, ball valve.

2, the sealing surface of the options:
A) face-to-face seal: a common spool of the plunger, the sealing surface for the 60 ° cone, the cone width is usually between 0.5mm ~ 2mm to seal it must ensure good contact of the two cone . But in fact, it is always subject to processing errors (as the heart of not round, tilt, etc.), the sealing effect is not very satisfactory. The type of valve leakage rate is usually 10-4, to reach 10-6 after precision grinding up to a higher seal level.
2) spherical seal: the use of spherical sphere rotating with fixed valve, a small cone tangent, their line of contact, which is better than the above face-to-face sealing effect. Ball valves, spherical sealing butterfly valve is to use this idea to make the leakage rate of up to 10-6 to 10-8, high-performance triple eccentric butterfly valve up to 10-8, and even zero leakage.
3) sealing the choice of materials:
(1) soft sealing: In addition to the corrosion-resistant lining valve, generally soft-sealing valve spool or seat either metallic materials (mainly PTFE and rubber) seal the form of valve. Soft sealing valve seals the best in the pipeline installation, cleaning of the system are likely to leave more or less clean debris (such as welding slag, iron, etc.) flows through the control valve, it is easy to soft sealing valve seat or valve scratches, an increase of leakage, poor sealing reliability. Therefore, the choice of soft seal structure must be considered before the media to clean and put into operation in strict flushing the piping. Valve inlet pump industrial washing machine
(2) sealed hard: hard seal resistant alloys is the best choice of the cut-off valve. In this way also take into account while considering the tightness of the life and reliability, although the factory index 10-4 ~ 10-5, amounting to less than a soft zero leakage seal effect, but enough to meet the requirements of strict cut off, and it durable, more cost-effective from the economic point of view.

3, the cut off valve reliability:
1) soft sealing, cut off the effect is good, but not suitable for granular media, once scratched, leakage would increase drastically. Therefore, when conditions permit, use a hard seal. \"O\" type ball hard sealing up 10-5, three eccentric butterfly valves up to zero leakage.
2) consideration of the seal wear resistance: In addition to the selected hard seal leakage requirements above 10-4 cut-off control valve, in order to improve the sealing of the abrasion resistance, erosion resistance, scratch resistant alloys the ability to improve the life of the valve.
3) cut-off valve assembly at room temperature, at high temperatures, the temperature change of the high-temperature media, several hundred degrees. The thermal expansion of the established will change the assembly than the pressure seal. Too tight, the sealing surface of the card, letter, the movement will be severely severely bruised and strained; too loose, the seal pressure is not enough, in both cases the leak will be a sharp increase. The best way to resolve the differences caused by the resilient seat to absorb the changes. There are typically three flexibility programs: (1) spring-loaded; ② The flakes flexible metal ring; (3) hardness and softness of resilient seat. The latter is best, both flexible to overcome thermal expansion, but also stiffness and resistant alloys to improve the reliability of the wear surface.
4) the erosion of media containing particles, we must consider the spool to avoid the direct erosion of the high-speed media.
5) For the hard seal must be stiff enough, the same hardness materials \"to each other, it is easy to scratch caused by leakage.

4, the shut-off valve valve options: the main valve shut-off valve to the above, type the following, select the cut-off valve should be considered in the leakage rate, media type, media, temperature, flow coefficient and other parameters and cost. In the following preferred order, the first seal, then consider the soft seal.
1) The triple eccentric metal hard seal butterfly valves; 2) eccentric spherical sealing butterfly valve; 3) valves; 4) Eccentric rotary valve; 5) a single seat valve; 6) sleeve valve; 7) Soft seal valve;

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Laser engraving cutting tips

Posted on March 16, 2012 by admin

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Joke Shock Flashlight – China Manufacturer
Thank you for inquiry my Joke Shock Flashlight, Tel: 86-0577-86573661, E-mail: wzsldz@laserkeychain.com
http://www.laserkeychain.com/key-joke-shock-flashlight-37/

 The use of laser engraving and cutting process is very simple, as the use of computers and printers print on paper. You can Win98/Win2000/WinXP environment using a variety of graphics software such as CorelDraw, and other design, scanned graphics, vector graphics and a variety of CAD files can be easily \"print\" to the engraving machine. The only difference is that the print toner coated paper, laser engraving laser shines on wood products, Pontiac tablets, plastic sheeting, sheet metal, stone, etc. Almost all of the material above.
    Laser engraving engraving way can be divided into a lattice engraving and vector cutting: dot sculpture dot sculpture resembles a high-resolution dot matrix printing. Laser oscillating head around, each carving out a series of points consisting of one line, then the laser head moves up and down at the same time carving out a multi-line, and finally to constitute a full-page image or text. Scanned graphics, text and vector graphics can be used to dot engraving. Vector cutting and different lattice engraving, vector cutting the outer contour line in the graphic. We usually use this mode to penetrate cutting wood, Pontiac tablets, paper and other materials in a variety of materials to the surface of the marking operation.
    The performance of an engraving machine, engraving speed, engraving intensity and spot size. Engraving speed engraving speed is the speed of laser head moving, usually with the IPS (inches / sec), high speed, high production efficiency. Speed ??is used to control the cutting depth for a particular laser intensity, the slower the speed, the greater the depth of cutting or carving. You can use the engraving machine panel to adjust the speed of the computer\\ s print driver can also be used to regulate. Within the range of 1% to 100%, the adjustment is 1%. Hummer machine\\ s advanced motion control system allows you to still get super fine quality carving sculpture the strength carved strength refers to hitting the surface laser intensity in the high-speed carving. For specific engraving speed, the greater the intensity, the greater the depth of cutting or carving. You can use the engraving machine panel to adjust the intensity, can also use the computer\\ s print driver to adjust. Within the range of 1% to 100%, the adjustment is 1%. The greater the intensity, equivalent to greater speed. Cutting depth of the deeper spot size beam spot size can be adjusted using different focal length lens. The small spot lens for high resolution engraving. Large spot of the lens is used to lower the resolution of the sculpture, but for vector cutting, it is the best option. The new equipment is standard 2.0-inch lens. The spot size in the middle, for various occasions.
    General engraving machine can engrave the following materials: wood, plexiglass, metal plates, glass, stone, crystal, Corian, paper, color plates, aluminum, leather, resin, spray metal.

 

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Decomposition the popularity of the auto market LED lights yet to be overcome five challenges

Posted on March 14, 2012 by admin

Web Design And Seo For www.china-webdesign.com
led light tube – China Manufacturer
Thank you for inquiry my led light tube, Tel: 86-577-62608819, E-MAIL:swinled@yahoo.com
http://www.swinled.com/key-led-light-tubes-40/

Led the application of technology continues to improve and the cost of gradual decline, the LED lights on the automotive electronics technology demonstrator After years of concept car shows the initial ideas stage, more close to a wide range of used in the production car system prospects. Audi R8 electronic system is in full use of LED lights to the Mercedes-Benz, BMW, Cadillac, Toyota and other companies have also introduced LED lights to replace traditional incandescent, HID lights of car models, a variety of colorful LED lamps for the new car considerably, attracting the attention of consumers, but also for the future of automotive design, a new bright spot, I believe that soon there will be more car manufacturers will be LED lights as automotive lighting, indication, backlighting and decorative choice.

LED is suitable for various lighting applications in automotive electronics, including headlight (high beam and low beam lamps), fog lights, taillights, brake lights, turn signals, daytime running lights, pedal lights, interior lights, showing the wide lights, navigation, entertainment systems, instrument backlighting and light and so on. LED lights used in automotive systems mainly have the following advantages: first, the color saturation, the output light is clear and soft, in line with the characteristics of automotive headlight applications; second, long life, durable, strong seismic can be more than 10,000 hours, while traditional halogen lamp life of 300 hours; Third, high efficiency, less additional loss can be seen, complex cooling system compared to traditional lights, LED lamp heat loss is much smaller. conversion efficiency can reach more than 85 percent, is particularly suitable for auto focus on energy-saving design concepts; Fourth, fast response, different from the traditional incandescent lamps, HID lamps require a longer drive light delay, but also real-time to reflect the vehicle speed and road conditions, leaving judge to give the driver a longer time, reducing vehicle safety accident; Fifth, small size, light weight, sleek lamps to save more space for other models design; sixth, the LED lights are but good light color, infrared, ultraviolet and other light, heat, radiation rarely suitable for automotive interior lighting, backlighting applications demand.

 

         LED lights use in cars, mainly concentrated in the headlights, taillights, lights, car GPS backlighting use, especially the tail lights, about 10 percent of the entire market.

          Five technical challenges

         Domestic vehicle the size of LEDs currently represent only a small share of about 10% of the automotive lighting market, mainly more concentrated in the high-end car applications. Although LED lights cost continued to decline, but to achieve comparable with the traditional light source, also need to gradually increase the quality and yield, in order to reduce the LED costs, and expand the LED automotive electronics market share.

          High cost is not to delay the LED lights in automotive applications only some of the technical performance aspects of the problem is to solve, for example, a single LED light intensity is still insufficient, this will not be able to arbitrarily reduce the number of LED\\ s to narrow lamps volume; smaller size is not conducive to the light source heat, which requires the thermal management of LED manufacturers make products in order to exploit the advantages of the LED more fully, both for the life of the LED or CRI can provide a better state. otherwise can only be counterproductive, reducing the quality of products; the conversion efficiency of the LED drive system is currently key points in higher power applications, many programs take into account the cost of conversion efficiency is not high; China LED lamp applications belong to high-end cars in automotive electronics, and high-end cars are most of the foreign car manufacturers control the selection and certification of the foreign manufacturers of LED suppliers are very harsh domestic LED difficult for enterprises to enter the supply chain; again in China LED lights most of the production levels remain within the requirements of civilian products, it is difficult to reach the standard of automotive-grade application, even to reach the number of manufacturers of automotive-grade application potential production capacity and ensure product consistency is not necessarily enough, it is difficult to meet The production car the needs of large quantities of high quality.

         LED lights in order to speed up the share in the entire automotive light, you must first increase the intensity to resolve these issues, as described above, thermal management, production costs and product consistency issues.

   Automotive requirements of discrete LED driver power supply

         Constant voltage source driver can not guarantee the consistency of the LED brightness and affect the reliability of the LED life and lumen maintenance. Therefore, the LED must use a constant current source drive. Most LED current value, you can use the configuration for the constant current source of the linear regulator to drive the linear regulator has the advantages of reducing component count and reduce electromagnetic interference (EMI), but in the efficiency and thermal consumption has serious drawbacks, not suitable for high power applications, switch mode power supplies (SMPS) is more suitable in various applications.

         SMPS mode LED driver power supply as the market mainstream, but also into the separation device combinations and IC integrated approach to IC integration patterns such as Taiwan Macroblock (MacroBlock), Zetex (Diodes Incorporated), TI and NSC, the main feature is the built-in MOSFET drive circuit, and some integrated multi-channel driver, auto-dimming and various protection functions, the application circuit is simple, small, easy to control costs, but due to this current application-driven design is not flexible enough, the control precision is not high, boost mode, and other reasons can not be achieved, very limited in most automotive applications, the separation mode PWM control chip and the external MOSFETs for automotive electronics, high power, high efficiency and high stability can be achieved of applications, it can be a different topology, combined with LED voltage, current and power demand, in line with the overall system goals. With the amount of the cost will decrease gradually.
Europe pre-installed market mainstream

         MCU + The MCP1630 program applications in Europe application is quite extensive representing Europe pre-installed in more than 70 percent of the market, market, mainly used in the headlights (high beam), tail lights, flashing lights and other applications, the chip is its high reliability, high efficient, flexible functionality, cost-effective LED driver applications in automotive electronics in establishing a good reputation, some foreign vendor LED driver preferred the same time, increasing with the amount of The MCP1630 cost advantages are more and more Obviously, the application can be in the low-end models, better thermal management, efficiency, and consistency in the LED driver.

          The MCP1630 is a high-speed pulse width modulator can be used to develop intelligent power. MCP1630 to 1MHz frequency peak current mode CMOS output driver can directly control the MOSFET driver or low-side N-channel MOSFET to provide an external reference power supply, flexible adjustment of output voltage and current settings; internal high-speed comparator, high-speed bandwidth / The error amplifier can be achieved faster and more accurate current sense, integrated over-temperature protection, undervoltage lockout function to achieve better thermal management. Conjunction with a microcontroller, it can be by controlling the duty cycle of the power system to provide a stable output voltage or current. The MCU is used to adjust the output voltage or current, switching frequency, maximum duty cycle and can improve the power system more intelligent and regulatory characteristics.

          LED driver system, if the supply voltage exceeds the total LED voltage, you need to buck converter. If the voltage of the LED group than the supply voltage, you need the boost converter. In automotive power systems, LED voltage may be higher or lower than the supply voltage, so you should use a buck / boost or single-ended primary inductance converter (SEPIC) power supply topologies. MCP1630 to achieve the above topology design needs. At the same time adhering to the Microchip products in a consistent style (high stability and consistency), LED production cost and quality have been improved. The following example, Microchip\\ s high-speed PWM chip MCP1630 SEPIC topology to illustrate the applicability of the program in automotive applications.

   Microchip\\ s PIC12F1823 + MCP1630 SEPIC topology for automobile tail light / flash applications the DEMO to +9 V to +16 V input voltage, maximum output voltage up to 55V @ 350mA drive 10 1.5WLED lights, at the same time to achieve grade dimming, undervoltage, overtemperature protection function, the conversion efficiency of 85%.

           MCP1630 This application can make the LED load current under the influence of various factors are controlled at the level of pre-designed circuit will be a reference voltage or current signal Vref and the LED load voltage or current signal FB into the signal control module , the error signal is sent back after treatment in the primary control IC processing, when the load current changes due to various factors, the primary controller IC can control switch so that the load current back to the initial design value. Feedback and over-temperature detection, good thermal management.

 

    In the topology, the efficiency of the SEPIC converter, although not as buck regulator or boost regulator, but it also has its advantages, the SEPIC, and has the ability to boost and buck, particularly for automotive cold start voltage as low as 4.5V or so, on the other hand, the sudden rise dump application voltage in the car overload situation will suddenly rise to 40V above, another very popular automotive applications, the advantages of attention in the middle of its circuit capacitor, it can be very effective isolation between input and output. Of course, the SEPIC converter, there is an obvious drawback is that the two inductors are required in order to operate. This application will be two inductors wound in concentric circles into opposing two separate components, which saves cost and savings volume. MCP1630 in the peak-current mode due to the presence of high-speed comparator in 12ns fast response and rapid high-precision current loop. At the same time PIC12F1823 can be detected through the AD voltage detection to achieve high efficiency control.

        Applications, The MCP1630 can be used as a SEPIC topology can also be used in a separate boost / buck circuit is mainly used in automobile headlights with daytime running lights can be LED

          In addition to the the MCP1630 applications, Microchip has also introduced low-cost MCU integrated LED driver applications such as PIC12HV615, the PIC16HV785, its internal integration of the high pressure regulator, high-speed hardware PWM module, comparators, ADCs, op amps, voltage reference, step-up or step-down control can be achieved for low-power applications in the vehicle equipment backlight, instrument backlighting, brake lights, and turn into a traditional CCFL backlight LED backlight. The rich resources of the MCU can be more intelligent, highly integrated applications to reduce costs, simplify design, save space and also help to overcome thermal management, and improve efficiency. However, the application is not suitable for higher power applications.

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