留言内容Will EE28 flux density? Recently built a APFC circuit inductance calculation L6562 when it came to the question, Bmax (flux density), I do not know how to calculate. Skeleton core using EE28, chip frequency 20KHz. Who knows the next trouble to help answer.
售后解答Will EE28 flux density? Recently built a APFC circuit inductance calculation L6562 when it came to the question, Bmax (flux density), I do not know how to calculate. Skeleton core using EE28, chip frequency 20KHz. Who knows the next trouble to help answer.
用户-13#Zhang 2014-11-11 18:12:42
留言内容I ask, in the manufacture of electronic transformers, choose EE core or ring, where the biggest difference between the two?
售后解答The first is the volume of the issue,,,,
The second is efficiency
The third is a safety ring feel better,,,,,,
The fourth is the cost, I believe the same power output with EE-type ring than to be cheap. Maybe this is the main reason
Summary: In the same effective cross-sectional area, the magnetic power can be transmitted is about 20% higher than the core issues 2.EE EE core pack tape is difficult to deal with the problem, especially under high power situations. , the current is large, the heat is also large, thus resulting in softening of the adhesive tape, the core of the loose, power is unstable.
用户-12#Mr. Ng 2014-11-04 11:48:31
留言内容Hello, would like to ask you about, our production of high-frequency transformer squeaky What are the reasons? I do EE13, EE16 high frequency transformer core.
售后解答The main reason for the high frequency transformer squeaky has three aspects: technological problems of the transformer, the transformer loops, the core issue of the transformer, then the following one analysis Hui Yue Technology.
Process Issues (1) of the transformer
① dipping drying is not in place, resulting in the core is not strong mechanical vibration and beep cause;
② gap length is not suitable, resulting in unstable work status of the transformer beep;
③ line package no takeup may also lead to sound;
④ gapped core combinations exist, causing vibrations in the air and emit high-frequency sound (transformer if after vacuum immersion, generally not audible).
Loops (2) of the transformer
Loops refers transformer transformer transformer loop oscillations causing howling.
① circuit board wiring properly, causing interference caused by oscillations, resulting in sound;
② feedback loop parameters are set incorrectly, resulting in an unstable loop that oscillates and beep;
③ loop quality components, such as the lack of input capacitance, output rectifier diode fast recovery is not good quality, good power MOS quality, RCD snubber circuit of high voltage recoil content or poor quality diodes, etc. These problems are likely to lead to volatility caused by noise.
Core issue (3) of the transformer
When the transformer core saturation occurs, the coil current increases, transformer heating and self-excited oscillation, the oscillation coil surrounding air, thus causing vibration beep.
