A PRESENTATION ON HALF WAVE RECTIFIER
- 2. Simranjit Singh Shubham Rana Shalini Shweta Panchal Vivek Sagar Himanshu Payal Suresh A P R E S E N T A T I O N BY
- 4. .A rectifier is an electrical device that converts the alternating current (AC) , which periodically reverses direction, into the direct current (DC) , which flows only in one direction. This process is known as Rectification. .Physically, rectifiers take a number of forms, including vacuum tube diodes, mercury -arc valves, copper and selenium oxide rectifiers, semiconductor diodes, silicon-controlled rectifiers and other silicon-based semiconductor switches.
- 5. .In half wave rectification of a single-phase supply, either the positive or negative half of the AC wave is passed, while the other half is blocked. .Because only one half of the input waveform reaches the output, mean voltage is lower. .Half-wave rectification requires a single diode in a single- phase supply, or three in a three-phase supply. Rectifiers yield a unidirectional but pulsating direct current. .Half-wave rectifiers produce far more ripple than full-wave rectifiers, and much more filtering is needed to eliminate harmonics of the AC frequency from the output.
- 8. T h e h a l f - w a v e r e c t i f i e r c i r c u i t u s i n g a s e m i c o n d u c t o r d i o d e ( D ) w i t h a l o a d r e s i s t a n c e R L . T h e d i o d e i s c o n n e c t e d i n s e r i e s w i t h t h e s e c o n d a r y o f t h e t r a n s f o r m e r a n d t h e l o a d r e s i s t a n c e R L . T h e p r i m a r y o f t h e t r a n s f o r m e r i s b e i n g c o n n e c t e d t o t h e a c s u p p l y m a i n s . T h e a c v o l t a g e a c r o s s t h e s e c o n d a r y w i n d i n g c h a n g e s p o l a r i t i e s a f t e r e v e r y h a l f c y c l e o f i n p u t w a v e . D u r i n g t h e p o s i t i v e h a l f - c y c l e s o f t h e i n p u t a c v o l t a g e i . e . W h e n u p p e r e n d o f t h e s e c o n d a r y w i n d i n g i s p o s i t i v e w . r . t I t s l o w e r e n d , t h e d i o d e i s f o r w a r d b i a s e d a n d t h e r e f o r e c o n d u c t s c u r r e n t . I f t h e f o r w a r d r e s i s t a n c e o f t h e d i o d e i s a s s u m e d t o b e z e r o ( i n p r a c t i c e , h o w e v e r , a s m a l l r e s i s t a n c e e x i s t s ) t h e i n p u t v o l t a g e d u r i n g t h e p o s i t i v e h a l f - c y c l e s i s d i r e c t l y a p p l i e d t o t h e l o a d r e s i s t a n c e R L , m a k i n g i t s u p p e r e n d p o s i t i v e w . r . t . I t s l o w e r e n d . T h e w a v e f o r m s o f t h e o u t p u t c u r r e n t a n d o u t p u t v o l t a g e a r e o f t h e s a m e s h a p e a s t h a t o f t h e i n p u t a c v o l t a g e . D u r i n g t h e n e g a t i v e h a l f c y c l e s o f t h e i n p u t a c v o l t a g e i . e . W h e n t h e l o w e r e n d o f t h e s e c o n d a r y w i n d i n g i s p o s i t i v e w . r . t . I t s u p p e r e n d , t h e d i o d e i s r e v e r s e b i a s e d a n d s o d o e s n o t c o n d u c t . T h u s d u r i n g t h e n e g a t i v e h a l f c y c l e s o f t h e i n p u t a c v o l t a g e , t h e c u r r e n t t h r o u g h a n d v o l t a g e a c r o s s t h e l o a d r e m a i n s z e r o . T h e r e v e r s e c u r r e n t , b e i n g v e r y s m a l l i n m a g n i t u d e , i s n e g l e c t e d . T h u s f o r t h e n e g a t i v e h a l f c y c l e s n o p o w e r i s d e l i v e r e d t o t h e l o a d . T h u s t h e o u t p u t v o l t a g e ( V L ) d e v e l o p e d a c r o s s l o a d W o r k i n g o f a h a l f w a v e r e c t i f i e r
- 9. .TRANSFORMER .DIODE .IC (7912) .LED .CAPACITOR .RESISTOR Components required to make half wave rectifier :