ELCT Class performance (Quizzes 1&2 and Midterm)

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Transcript ELCT Class performance (Quizzes 1&2 and Midterm)

ELCT Class performance (Quizzes 1&2 and Midterm)
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Full wave rectifier circuits
1.
In a full wave rectifier circuit, usually
a transformer is used to isolate the
load from the ac power line, and
provide out of phase input voltages.
2.
It also allows the designer to
choose the input to the rectifier
circuit from the turns ratio.
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Diode-bridge full-wave rectifier
Note that the capacitor is half
compared to a half-wave rectifier
circuit, as the capacitor needs to
discharge for only half the time.
The output voltage can be further “smoothed out” by using a regulator circuit.
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Voltage Regulator Circuits
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A Simple Zener-Diode Voltage Regulator
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Example on source regulation
Calculate the source regulation for a Zener diode with characteristics shown below.
Slope of the load line is -1/R. Thus,
change in supply voltage changes
the position of the load line, but not
the slope
In general:
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Load-Line Analysis of Complex Circuits
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Example: Analysis of a Zener-diode regulator with load
Found by considering open
circuit in place of the diode in
part (b)
Found by considering open
circuit in place of the diode
and assuming the source to
be short circuit
From the Thevenin equivalent circuit, we can write the load equation as:
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Solution continued
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Example: Analysis of a Zener-diode regulator with load
Found by considering open
circuit in place of the diode in
part (b)
Found by considering open
circuit in place of the diode
and assuming the source to
be short circuit
From the Thevenin equivalent circuit, we can write the load equation as:
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Solution continued
Thus, the solution is : Vd = -10 V, and id = -10 mA
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