河南科技大学（论文）
SWITCHING POWER SUPPLY DESIGN BASED ON
UC3842
ABSTRACAT
P o w e r i s t o a c h i e v e p o w e r c o n v e r s i o n a n d p o w e r t r a n s m i s s i o n m a j o r
e q u i p m e n t. I n t h e i n f o r m a t i o n a g e , a g r i c u l t u r e , e n e r g y , t r a n s p o r t a t i o n ,
communications and other areas Power of the film industry make a greater and
h i g h e r r e q u i r e m e n t s， s u c h a s e n e r g y , m a t e r i a l s , w e i g h t r e d u c t i o n ,
e n v i r o n m e n t a l p r o t e c t i o n , s a f e t y a n d r e l i a b i l i t y . T h i s h a s f o r c e d t h e p o w e r
workers have been exploring the technology for a variety of rural customs, the
p o w e r t o m a k e t h e b e s t p r o d u c t s t o m e e t t h e r e q u i r e m e n t s o f a l l w a l k s o f
l i f e. S w i t c h i n g p o w e r s u p p l y i s a n e w t y p e o f p o w e r s u p p l y , c o m p a r e d t o
traditional linear power supply, high technology, low energy consumption, easy
to use, and has achieved good economic results.
U C 3 8 4 2 i s a n e x c e l l e n t c u r r e n t - c o n t r o l l e d p u l s e w i d t h m o d u l a t o r .
I f f o r s o m e r e a s o n , t h e o u t p u t v o l t a g e i n c r e a s e s , t h e p u l s e w i d t h m o d u l a t o r
drive signal will change the pulse width, that is, the duty cycle D, so that the
av erage voltage drop a fter th e choppe r to achieve the regulat or end, and v ic e
versa how ever.UC3842 can control direct drive MOS, IGBT, etc., suitable for
the production of 20 ~ 80W low-power switching power supply. As the device
i s c l e v e r l y d e s i g n e d , l a u n c h e d b y t h e m a i n p o w e r s u p p l y v o l t a g e d i r e c t l y t o
f o r m c i r c u i t c o m p o n e n t s r e q u i r e d f o r a s m a l l , v e r y c o n s i s t e n t w i t h c i r c u i t
design, "simplicity first" principle.
KEY WORDS: Switching Power Supply，uc3842，PWM，power，IGBT
yangluoning2013-05-31挺好的，有帮助
