Rectifier
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A rectifier converts alternating current (AC) to direct current (DC) using a step-down transformer and a semiconductor diode. The process involves the diode being forward biased during the positive half cycle, allowing current to pass, and reverse biased during the negative half cycle, blocking current. This mechanism enables the rectification of AC voltage to supply DC voltage to a load.
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.
- 3. ALTERNATING CURRENT IS THAT CURRENT WHICH DIRECTION REVERSE PERIODICALLY AND IN DIRECT CURRENT IS THAT CURRENT IN WHICH THE DIRECTION OF CURRENT REMAIN SAME
- 4. 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
- 5. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
- 11. NOW WORKING OF RECTIFIER
- 12. 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
- 14. The Full Wave Rectifier (Centre Tapped )