Unitek UNIBOND 2, Руководство пользователя

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2E
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Figure 25 - S i m p l e Vo l t a g e D i v i d e r i l l u s t r a t e s t h e P e r c e n t o f O u t p u t
Power d e l i Ve r e d t o RL, t h e o u t p u t l o a d , when RL i s : ( a ) e q u a l t o
Rout' • ( b ) t w i c e R o u t ' • ( c ) o n e - h a l f Rout.
In t h e Unibond I I d e s i g n , a s shown o n t h e b l o c k diagram. m o s t o f t h e c i r c u i t r y i s
devoted t o g e n e r a t i n g a p u l s e t h a t h a s i t s a m p l i t u d e and d u r a t i o n d e t e r m i n e d b y
thumbwheel s w i t c h s e t t i n g s , a n d k e e p i n g t h a t p u l s e w i t h i n t h e v o l t -second c a p a b i l -
i t i e s o f t h e t r a n s f o r m e r and t h e s a f e o p e r a t i n g a r e a o f t h e t r a n s i s t o r s .
PULSE WIDTH
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PULSE WIDTH
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7.02. O U T P U T CIRCUIT
47
SAFE
OPERATING
AREA
COMPARATOR
F i g u r e 26 - B l o c k Diagram o f Unibond I I .
U n i t e k h a s a p p l i e d f o r a p a t e n t o n t h e P u l s e A m p l i f i e r / D r i v e r , t h e O u t p u t S t a g e , a n d
the Feedback Network used i n t h e Unibond I I . F i g u r e 27 shows t h e Unibond o u t p u t am-
p l i f i e r a n d f e e d b a c k n e t w o r k , w i t h o u t t h e r a n g e s w i t c h i n g and p r o t e c t i o n c i r c u i t r y s o
t h a t i t may b e more e a s i l y d e s c r i b e d and u n d e r s t o o d . T h e component d e s i g n a t o r s a r e
the same a s o n t h e Schematic shown i n F i g u r e 3 6 . B e c a u s e o f u n s a f e a r e a s o f t r a n s i s -
t o r o p e r a t i o n , t h e power s u p p l y t h a t s u p p l i e s t h e o u t p u t s t a g e i s programmed b y t h e
pulse a m p l i t u d e thumbwheels.
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