By James Clark

ISBN-10: 012175460X

ISBN-13: 9780121754600

ISBN-10: 0323159923

ISBN-13: 9780323159920

AC strength Conditioners: layout and functions presents a few perception into many of the kinds of energy line disturbances, difficulties that ensue day-by-day, and their corresponding options. This ebook is equipped into 4 components encompassing 14 chapters; every one half bargains with a unique type of energy protection.

Part I introduces some of the varieties of power-line difficulties encountered that may be damaging to digital apparatus or the knowledge it includes. components II and III are dedicated to noise and surge aid, in addition to energy line rules. those elements describe using thyristor regulator, constant-voltage transformer, and linear and switching power-line regulators. half IV makes a speciality of blackout defense, with specific emphasis at the use of switching converter, thermal administration, filters, and inverter regulate circuitry.

This booklet is meant essentially to scholars and researchers.

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Extra resources for AC Power Conditioners. Design and Application

Example text

13 J 2. 36 J. It is important that the selected MOV be sized to handle the energy it is exnected to have to absorb. 0 — ■■>! ^peak M K(l) ^peak S. i Equation t ► 'peak 'peak : i FIGURE 3-4 Transient waveform applied to MOV. 3. S u r g e R e d u c t i o n 31 S i n c e t h e c l a m p i n g a b i l i t y o f t h e M O V is o f i n t e r e s t h e r e , o n l y t h e v o l t a g e s or transients that m a y occur over a n d above the rated p e a k line voltage are to b e c o n s i d e r e d . T h e w o r s t - c a s e ratio o f p e a k s u p p r e s s e d v o l t a g e at a g i v e n cur­ r e n t t o t h e m a x i m u m r a t e d s t e a d y - s t a t e p e a k c i r c u i t v o l t a g e is t h e e f f e c t i v e c l a m p i n g r a t i o .

S o , w h i l e there are s o m e definite constraints placed o n the range o f voltage a n d fre­ q u e n c y , f o r a g i v e n t r a n s f o r m e r d e s i g n , it c a n b e s e e n t h a t o p e r a t e d w i t h i n t h e constraints the transformer b e c o m e s nearly a linear c o m p o n e n t and can be regarded as s u c h . G i v e n a l l t h e p r e c e d i n g r e l a t i o n s h i p s , it is s e e n t h a t a s t h e i n p u t v o l t a g e R M S value fluctuates, so does the R M S value o f the secondary voltage.

This will c a u s e a slight b u d g e in t h e coil, but t h a t is o f l i t t l e c o n c e r n . T h e a m o u n t o f l e a k a g e i n d u c t a n c e a c h i e v e d w i l l d e ­ p e n d o n the a m o u n t a n d type o f / material used. This m e t h o d has proven to b e as effective as t h e o t h e r types o f c o n s t r u c t i o n against n o r m a l - m o d e noise. Summary Problems caused by the existence o f E M I / R F I noise o n p o w e r lines c a n often be very subtle and m a y take a great deal o f time to solve.

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