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Agilent Technologies E3632A User Manual page 146

Dc power supply
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Chapter 7 Tutorial
Output Characteristics
Output Characteristics
A n i d e a l c o n s t a n t - v o l t a g e p o w e r s u p p l y w o u l d h a v e a z e r o o u t p u t i m p e d a n c e
a t a l l f r e q u e n c i e s . T h u s , a s s h o w n i n F i g u r e 7 - 3 , t h e v o l t a g e w o u l d r e m a i n
p e r f e c t l y c o n s t a n t i n s p i t e o f a n y c h a n g e s i n o u t p u t c u r r e n t d e m a n d e d b y t h e
l o a d .
Figure 7-3. Ideal Constant Voltage
Figure 7-4. Ideal Constant Current
Power Supply
Power Supply
T h e i d e a l c o n s t a n t - c u r r e n t p o w e r s u p p l y e x h i b i t s a n i n f i n i t e o u t p u t i m p e d a n c e
a t a l l f r e q u e n c i e s . T h u s a s F i g u r e 7 - 4 i n d i c a t e s , t h e i d e a l c o n s t a n t - c u r r e n t
p o w e r s u p p l y w o u l d a c c o m m o d a t e a l o a d r e s i s t a n c e c h a n g e b y a l t e r i n g i t s
o u t p u t v o l t a g e b y j u s t t h e a m o u n t n e c e s s a r y t o m a i n t a i n i t s o u t p u t c u r r e n t a t
a c o n s t a n t v a l u e .
T h e o u t p u t o f t h e E 3 6 3 2 A p o w e r s u p p l y c a n o p e r a t e i n e i t h e r c o n s t a n t - v o l t a g e
( C V ) m o d e o r c o n s t a n t - c u r r e n t ( C C ) m o d e . U n d e r c e r t a i n f a u l t c o n d i t i o n s , t h e
p o w e r s u p p l y c a n n o t o p e r a t e i n e i t h e r C V o r C C m o d e a n d b e c o m e s
u n r e g u l a t e d .
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