Rectifier
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Rectifier is a device that converts alternating current (AC) to direct current (DC). There are two main types: a half wave rectifier converts only one half of the AC cycle to DC while a full wave rectifier converts the entire AC cycle to DC. The key components of a rectifier are a step down transformer to reduce the AC voltage, and semiconductor diodes which allow current to pass during one half of the AC cycle but block it during the other half cycle, resulting in conversion to DC.
Rectifier
- 1. RECTIFIER BY PROF VISHNU NARAYAN SAXENA
- 2. RECTIFIER IS A DEVICE THAT CAN CONVERT AC IN TO DC SO THERE ARE TWO QUESTIONS WHY WE NEED TO CONVERT A.C. IN TO D.C. AND WHAT IS A.C. AND WHAT IS D.C.
- 4. ALTERNATING CURRENT IS THAT CURRENT WHICH DIRECTION REVERSE PERIODICALLY AND IN DIRECT CURRENT IS THAT CURRENT IN WHICH THE DIRECTION OF CURRENT REMAIN SAME
- 5. CLASSIFICATION OF RECTIFIER 1. Half Wave Rectifier 2. Full Wave Rectifier Half Wave Rectifier :-half wave rectifier convert only half cycle of ac signal into d.c. Half Wave Rectifier Full Wave Rectifier:- Full wave rectifier convert full cycle of a.c. signal into d.c. Full Wave Rectifier
- 6. Building Blocks of Rectifier 1.Step Down Transformer The function of step down transformer is to convert high A.C. Voltage(230 V) to Low A.C. Voltage (15V,12V etc)Because we can't apply high ac voltage to diode directly 2. Semiconductor Diode
- 7. Diode is a semiconductor switching device Which has two terminal 1. Anode 2. Cathode Diode can be conncted in any circuit either in forward bias or reverse bias
- 8. FORWARD BIAS: When anode is connected with +ve terminal of battery and cathode is connected with –ve terminal of Battery Diode is in forward bias and its resistance drop down to 0(r = 0) and it behaves like a close switch
- 9. REVERSE BIAS: When anode is connected with -ve terminal of battery and cathode is connected with +ve terminal of Battery Diode is in reverse bias and its resistance rises up to infinite and it behaves like an open switch
- 10. AC Voltage is first stepped down then applied to the diode During +ve Half Cycle Point A Will be at positive potential whereas point B will be at –ve Potential Diode D Will be in Forward Bias and behave like a close switch And positive half cycle will be passed as it is As Shown in fig
- 11. During Negative Half Cycle Point A will be At Negative Potential As Compared to Point B So Diode is in Reverse Bias and Behaves Like an Open Switch and negative half cycle does not passes to the load resistance
- 12. NOW WORKING OF RECTIFIER
- 13. DURING POSITIVE HALF CYCLE DIODE IS IN FORWARD BIAS AND BEHAVES LIKE A CLOSED SWITCH AND POSITIVE HALF CYCLE PASSES TO THE LOAD RESISTANCE DURING NEGATIVE HALF CYCLE DIODE IS IN REVERSE BIAS AND BEHAVES LIKE AN OPEN SWITCH AND NEGATIVE HALF CYCLE DOES NOT PASSES TO THE LOAD RESISTANCE IN THIS WAY HALF WAVE RECTIFIER CONVERT HALF CYCLE OF AN A.C. VOLTAGE TO THE D.C. VOLTAGE