LED brightness, low power consumption, miniaturization, long life and other advantages have promoted the rapid development of this technology, but LED lighting technology still has the challenges of high cost, large heat sink, low luminous efficiency and dimming. During the design process, engineers often encounter slow start-up, flicker, and uneven illumination when performing LED conventional adjustments. Therefore, how to solve the problem of LED flicker has become an urgent task for engineers. If high-precision constant-current control can be provided (can analyze the variable phase angle output of the thyristor controller and unidirectionally adjust the constant current flowing to the LED), the input EMI filter has very small inductance and capacitance, then it is effective. Can flashing dimming be possible?
Power Integrations (PI)'s LinkSwitch-PH series of LED driver ICs have solved this problem well. The primary side control technology of the product also eliminates the optocouplers and auxiliary circuits commonly used in isolated flyback power supplies (ie The secondary side control circuit), while the PFC part of the controller also eliminates the large-capacity electrolytic capacitor, which brings a great boon to the LED flicker-free dimming.
Today, LED lighting has become a mainstream technology. LED flashlights, traffic lights and lights are everywhere, and countries are pushing to replace incandescent and fluorescent lights in residential, commercial and industrial applications powered by mains with LED lights. After switching to energy-efficient LED lighting, the energy savings achieved will be amazing. In China alone, according to government estimates, if one-third of the lighting market turns to LED products , they will save 100 million kWh of electricity per year and reduce CO2 emissions by 29 million tons. However, there is still a problem to be overcome, that is, the dimming problem.
Incandescent lamps can be easily dimmed using a simple, low-cost, leading-edge TRIAC dimmer. Therefore, this dimmer can be seen everywhere. Solid-state lighting replacement lamps must be able to use existing controllers and lines for dimming in order to be truly successful.
Incandescent bulbs are ideal for dimming. The irony is that their inefficiency and the resulting high input current are the main factors that make the dimmer work well. The thermal inertia of the filament in an incandescent bulb also helps to mask any instability or oscillations produced by the dimmer. A number of problems have been encountered in trying to dim LED lights, often resulting in flicker and other unexpected situations. To understand why, it is first necessary to understand how thyristor dimmers work, LED lamp technology, and the interrelationships between them.
Figure 1 shows a typical leading edge TRIAC dimmer and the voltage and current waveforms it produces.
Figure 1 Front edge thyristor dimmer
Multilayer PCB consist of 3 or more circuit layers bonded together by a thickness of insulating material called prepreg and core. They came into the industry with the advent of SMD population. They are found almost everywhere, wherever electronics are in use – from aircraft to motorcycles, and storage power stations to photovoltaics.
Multilayer PCBs are most complicated than others, and are generally considered to be the most sophisticated PCB product due to their construction methods and design complexities.
BentePCB offers multilayer printed circuit boards with the following special technologies:
· Edge plating for shielding and ground connection
· High frequency base materials for applications up to 80 GHz
· Cavities, countersunk holes or depth milling
· Thick copper up to 105μm (inner and outer layers)
· 500μm thick copper inlays using HSMtec technology
· Solder resist in green, white, black, blue, grey, brown, etc.
· Controlled impedances (single, differential, etc.)
· All recognised Printed Circuit Board industry surfaces available
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Items |
Manufacturing Capabilities |
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Number of Layers |
1-16 layers |
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Material |
FR-4 |
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Maximum PCB Size(Dimension) |
650x1200 mm |
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Board Size Tolerance(Outline) |
±0.2mm/±0.5mm |
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Board Thickness |
0.6-3.0mm |
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Board Thickness Tolerance(t≥1.0mm) |
±10% |
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Board Thickness Tolerance(t<1.0mm) |
±0.1mm |
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Min Trace |
0.1mm/4mil |
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Min Spacing |
|
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Outer Layer Copper Thickness |
1oz/2oz/3oz/4oz(35μm/70μm/105μm/140μm) |
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Inner Layer Copper Thickness |
1oz/2oz/3oz/4oz(35μm/70μm/105μm/140μm) |
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Drill Sizes (CNC) |
0.2-6.3mm |
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Min Width of Annular Ring |
0.15mm(6mil) |
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Finished Hole Diameter (CNC) |
0.2mm-6.2mm |
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Finished Hole Size Tolerance(CNC) |
±0.08mm |
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Solder Mask |
LPI |
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Minimum Character Width(Legend) |
0.15mm |
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Minimum Character Height (Legend) |
0.8mm |
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Character Width to Height Ratio (Legend) |
1:05 |
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Minimum Diameter of Plated Half Holes |
0.6mm |
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Surface Finishing |
HASL with lead |
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HASL lead free |
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Immersion gold |
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Solder Mask |
Green ,Red, Yellow, Blue, White ,Black |
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Silkscreen |
White, Black, None |
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Panelization |
V-scoring, |
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Tab-routing, |
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Tab-routing with Perforation (Stamp Holes) |
About Us:
BentePCB is a professional PCB manufacturing which is focus on double side, multilayer, HDI PCB, rigid PCB and Flexible PCB mass production. The company was established on 2011.
We have two factories together, The factory in Shenzhen is specialized in small and middle volume orders and the factory in Jiangxi is for big volume.
Why Us?
UL (E492586), ISO9001, ISO14001, TS16949, RoHS certified.
Turnover USD 10-50 million per year.
15,000 sqm area, 450 staff .
Mass Production from single to 16 layers.
Special Material:ROGERS, Arlon, Taconic.etc.
Client:Huawei, SAMSUNG, Malata, Midea,Texas Instruments.etc.
Certification(UL:E492586, TS16949, ISO14001, ISO9001,RoHS):
Factory Tour:
Exhibition:
We Took part in the famous exhibitions over the past years,and got highly appreciation from the top experts,as well as cooperated tightly with them.
Delivery:
BentePCB offers flexible shipping methods for our customers, you may choose from one of the methods below.
FAQ:
Q1: What does BentePCB need for a customized PCB order?
A: The customers need to provide Gerber or pcb file.If you do not have the file in the correct format, you can send all the details related to the products.
Q2: What is your quotation policy?
A: For the PCB order in large quantity, BentePCB will send you the quotation based on the MOQ of the products concerned, and the price will be reasonable with good quality.
Q3: How long will you send us quotation ?
A: After all files were sent, 2 to 8 hours as per your file.
Q4: What is your minimum order quantity?
A:Our MOQ is 1 PCS.
Q5: How about the service BentePCB offered to the customers?
A: If you have any questions about our products or company, do not hesitate to send us your inquiry to our customer service representatives, Your satisfaction is our pursuits.
Multilayer PCB
Multilayer PCB, Multilayer PCB Design, Multilayer Circuit Board, Rigid Multilayer PCB
Shenzhen Bente Circuit Limited , http://www.bentegroup.com