Design of a High Efficiency AC / DC Power Supply

Due to the increase of power density, the density of energy loss is more concentrated. Higher efficiency means lower heat loss. Improving power efficiency is rapidly becoming the only feasible measure to improve power density. In the AC / DC power supply discussed in this paper, more than 80% efficiency can be regarded as high efficiency. Now, some of the commercially available power supplies have achieved 90% efficiency, but these products are aimed at the high-end market.

Efficiency under light load

Previously, efficiency was not a key factor in many designs. The working load is less than 60% for most of the power supply life. The power supply rarely works for a long time under full load (100%). However, the specifications received at the beginning of the design are only given for the full load, so the design is also optimized for the efficiency at full load. Now, manufacturers take the efficiency under light load as the selling point of their design, because it can better reflect the real performance of the power supply. CECP, EPA and other organizations are also studying new regulations on efficiency under light load conditions. New technologies (such as digital control) are being used to improve efficiency over the full load range. Under light load conditions, the switching loss accounts for the main position, while under larger load, the conduction loss accounts for the main part (see Figure 1).

Topology of converter

The topology of the converter is the main factor affecting the overall efficiency of the system. The choice of topology is often inseparable  

Open trade-offs between cost, power consumption, size, switching frequency and efficiency. In the low efficiency design with low power (up to 200W), cost is the biggest factor, and flyback and forward converters are more common. These designs are inefficient because they can only transfer power in half of the switching cycle. In the other half of the switching cycle, the transformer needs to dissipate any energy it stores (leakage inductance). Because this part of energy is wasted, the overall system efficiency is reduced. Because the voltage and current on the switching element are too large, it can not be used in higher power applications.

Half bridge rectifier is an improvement on the method of forward converter (and flyback converter), because it only allows the switch to withstand a voltage stress equal to the DC input voltage, which is half of the stress on the forward converter. The lower voltage on the switch means the reduction of switching loss. It has the advantage of recycling any leakage inductance current (rather than allowing it to dissipate in a buffer circuit), so it improves the efficiency. Full bridge rectifier goes further and can turn on / off more power. From the perspective of efficiency, it is the preferred method because it minimizes the loss of primary coil and maximizes the use of transformer. Compared with half bridge structure, the switching current of full bridge structure is only half of the former. This also means less loss.

Artículos recomendados
Top Ten Conjectures of 2012 American Consumer Electronics Show (ces2012)
According to foreign media reports, when the world's largest science and technology exhibition is about to open, through ten guesses about the exhibition, maybe readers can infer the new science and technology products that will appear in the exhibition.1. Super book boomHas the super instinct reached 50 this year? There are rumors that Intel's new products are one of them.2. Tablet with Tegra 3 quad core processorAsus's Transformer prime tablet has been launched. It is certain that more tablets of the same type will come out in the near future.3. Smartphone with built-in quad core processorThe difference in screen size between smartphones and tablets has been shrinking. With the birth of smartphones such as HTC edge, the difference between the two will be even smaller.4. Naked 3D TVAlthough a few 3D TVs have been launched, 2012 may be the year of rapid development of 3D TVs. People don't have to be like buddy? Holly wore heavy glasses and 3D glasses to enjoy 3D TV programs.5. The next generation new host xbox720 supporting the second generation Kinect somatosensory peripheralsAlthough Microsoft has tried to break this rumor, the sign that it may launch a next-generation new host has made players have unlimited imagination.6. Nokia Windows 8 tabletEven now Nokia has officially reached a partnership with Microsoft, is it really ready to shift from mobile phone production to tablet computer production?7. Intel will launch mobile phonesAlthough we don't have great expectations for this rumor, we can't rule out that Intel will choose to launch its own mobile phone products in 2012.8. AMD's chip will be lighter and thinnerAlthough they can't be described as super original, will ADM's new products bring a heavy blow to the high-end notebook market?9. Consumer 3D scanning equipmentThere are rumors that Samsung may display a 3D scanning device on the market.10. 3D printing press with mass marketThe thing-o-matic 3D printer produced by American makerbot company is very powerful. 2012 may be a booming year for household product manufacturing for every customer.
How to Reduce Standby Power Consumption of Power Supply
Machine Needs F1 Key to Reboot, How to Skip This?
Siemens Is Considering Using Blockchain to Improve the Car Sharing Market
Pretty and Cool Halloween Witch Or Dark Fairy Costume Ideas for a 11 Year Old Girl?
What Should My Sister Put on Her Wedding Registry?
Help! Aquarium with Sand and Hang on Filter?
LiTTT Snaps LED Strips Together Without Solder
Tong Wen, Huawei Wireless CTO: Three Key Contents of 5g Development
Multiple Games in Same Box Using Same Components. What Was It?
related searches
How to Reduce Standby Power Consumption of Power Supply
Top Ten Conjectures of 2012 American Consumer Electronics Show (ces2012)
Machine Needs F1 Key to Reboot, How to Skip This?
Siemens Is Considering Using Blockchain to Improve the Car Sharing Market
Pretty and Cool Halloween Witch Or Dark Fairy Costume Ideas for a 11 Year Old Girl?
What Should My Sister Put on Her Wedding Registry?
Help! Aquarium with Sand and Hang on Filter?
LiTTT Snaps LED Strips Together Without Solder
Tong Wen, Huawei Wireless CTO: Three Key Contents of 5g Development
Contact Us
Contact Person: AI customer service
Tel: +86 0757-23368757
Address: No.119, Shuiyin Road, Yuexiu District, Guangzhou 
WHATSAPP: 13885223350
SKYPE: SKYPE 2019
Better Touch Better Business
Contact Sales at JuJiao.
Call Us
+86 0757-23368757
  
Copyright © 2021 FOSHAN SAN DUN Furniture CO., LTD. | All Rights Reserved |Sitemap