With the rapid development of power electronic technology, the relationship between power electronic equipment and people's work and life is increasingly close.
Feature 1: distributed power supply structure
Before we talk about distributed power systems, there are two types of distributed power systems, two-stage and three-stage.The distributed power supply system is suitable for large workstations and digital electronic switching systems composed of ultra-high speed integrated circuits.It has the advantages of modular DC/DC converter components, easy to achieve N+1 power redundancy, easy to expand the load capacity, can reduce the current and voltage drop on the 48V bus, easy to achieve uniform heat distribution, easy to design heat dissipation, good transient response, and online replacement of failure modules.
 
Feature 2: power semiconductor device performance
SiC is an ideal material for power semiconductor device wafers. Its advantages are: forbidden bandwidth, high operating temperature (up to 600℃), good thermal stability, small on-state resistance, good thermal conductivity, small leakage current, high voltage resistance PN junction, conducive to the production of high temperature resistant high-frequency high-power semiconductor electronic components.Therefore, it is not difficult to see that silicon carbide will be the most successful new power semiconductor device material in the 21st century, and its appearance will greatly improve the performance of our original product design.
 
Feature 3: high frequency magnetic and synchronous rectification technology innovation
Switching power supply in the performance of high frequency magnetic components used magnetic materials have certain requirements, among which small loss, good heat dissipation performance is the basic requirements, only to achieve such a standard to achieve product optimization, magnetic properties will be superior.Magnetic materials suitable for megahertz frequencies are a major concern for users, and nano-crystalline soft magnetic materials have also been developed and applied.
 
However, after having the high-frequency technology, improving the efficiency of switching power supply is another technical difficulty, which requires our technical designers to develop and apply the soft switching technology. And this kind of soft switch technology has become a research hotspot in the industry for many years, and has been paid more and more attention by designers.
 
We have seen such technology, such as synchronous rectification SR technology, which USES power MOS tube reverse connection as rectification and switch diode instead of schottky diode (SBD).This design can reduce the tube pressure drop and thus improve the circuit efficiency.This is how we try to reduce the on-state loss of the switch and further improve its efficiency for the soft-switch converter with low voltage and large current output.

SUKI
2020-5-6
 

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