Rectifier Circuit, Rectifier Theory, Half Wave Rectifier, Full Wave Rectifier, Rectifier Diode
RECTIFIER: The circuit which converts AC into DC is called
Rectifier Circuit.
There are basically two types of Rectifier Circuit:
1)
Half wave Rectifier
2)
Full wave Rectifier
(a)
Centre Tap Full Wave Rectifier
(b)
Bridge Full Wave Rectifier
1). HALF WAVE RECTIFIER
This is the simplest Rectifier Circuit. The circuit has only
one diode.
IN POSITIVE CYCLE OF THE INPUT AC VOLTAGE:
When the input voltage is positive the anode of diode is +ve
and the cathode of diode is –ve. This results in forward biasing of the diode.
When the diode is forward bias it behaves as a short circuit. As a result we
get the input voltage at the output of the circuit. As a result we get the
input voltage at the output of the circuit.
IN NEGATIVE CYCLE OF THE INPUT VOLTAGE
When the inputs reverse its cycle the anode of the diode
become –ve. This reverse biases the diode. As a result the diode behaves as
open circuit. No current can flow in the circuit and the output voltage we get
is zero.
PERFORMANCE OF HALF WAVE RECTIFIER
The current wave of half wave rectifier
THE TOTAL RMS VALUE:
RIPPLE FACTOR (r):
RECTIFICATION EFFICIENCY (ŋ):
FULL
WAVE RECTIFIER
There are two
types of Full wave rectifier:
(a) CENTRE TAP RECTIFIER
(b) BRIDGE RECTIFIER
Centre
tap rectifier uses a centre tap transformer, two diodes D1 and D2.
DURING +VE HAALF CYCLE:
With
this polarity D1 will be forwarded biased and D2 will be reverse biased. D1
will behave as short circuit and D2 will be open circuit.
The
current will flow in the upper part of the circuit and no current will flow in
the lower part. The current will flow through the load in the shown direction
and the polarity of the voltage drop in the load will be as shown in the figure
above.
DURING –VE HALF
CYCLE:
During
–ve half cycle the D1 will be open circuit and D2 will be short circuit. The
current in the circuit is as shown in the fig. Note the direction of current is
same through the load resistance as the current is +ve half cycle. As the
current is unidirectional in the complete cycle we can say we have got a DC
PEAK INVERSE VOLTAGE (PIV)
(b) BRIDGE RECTIFIER
DURING +VE CYCLE
In this input diodes D1 and D3 are forward bias.
The flow of current will be as shown in figure below:
DURING –VE CYCLE
At this moment diodes D2 and D4 are forward bias
and D1 and D3 are reverse bias. The flow of current will be as shown in figure
below.
The flow of current is
unidirectional therefore the voltage developed across the load is DC.
PEAK INVERSE VOLTAGE (PIV)
PIV
of the diodes used in the circuit is Vm.
Performance of Full-wave Rectifier
The DC Value:
The Total RMS Value:
Ripple Factor:
Rectification
Efficiency:
how to design the apple laptop power adapter. with source power is 240rms/50HZ to output is 14.5V and 3.1A.This circuit using bridge rectifier.
ReplyDeleteThanks alot for making clear rectifier circuit
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