The Center-Tapped Transformer Rectifier
The voltage waveforms for a resistive load for the rectifier using the centertapped
transformer are shown in Fig. 4-2. Some basic observations for this circuit
are as follows:
1. Kirchhoff’s voltage law shows that only one diode can conduct at a time.
Load current can be positive or zero but never negative.
2. The output voltage is vs1 when D1 conducts and is vs2 when D2 conducts.
The transformer secondary voltages are related to the source voltage by vs1
vs2 vs( N2/2N1).
3. Kirchhoff’s voltage law around the transformer secondary windings, D1, and
D2 shows that the maximum voltage across a reverse-biased diode is twice
the peak value of the load voltage.
4. Current in each half of the transformer secondary is reflected to the primary,
resulting in an average source current of zero.
5. The transformer provides electrical isolation between the source and the
load.
6. The fundamental frequency of the output voltage is 2 since two periods of
the output occur for every period of the input.
The lower peak diode voltage in the bridge rectifier makes it more suitable
for high-voltage applications. The center-tapped transformer rectifier, in addition
to including electrical isolation, has only one diode voltage drop between the
source and load, making it desirable for low-voltage, high-current applications.
The Center-Tapped Transformer RectifierThe voltage waveforms for a resistive load for the rectifier using the centertappedtransformer are shown in Fig. 4-2. Some basic observations for this circuitare as follows:1. Kirchhoff’s voltage law shows that only one diode can conduct at a time.Load current can be positive or zero but never negative.2. The output voltage is vs1 when D1 conducts and is vs2 when D2 conducts.The transformer secondary voltages are related to the source voltage by vs1 vs2 vs( N2/2N1).3. Kirchhoff’s voltage law around the transformer secondary windings, D1, andD2 shows that the maximum voltage across a reverse-biased diode is twicethe peak value of the load voltage.4. Current in each half of the transformer secondary is reflected to the primary,resulting in an average source current of zero.5. The transformer provides electrical isolation between the source and theload.6. The fundamental frequency of the output voltage is 2 since two periods ofthe output occur for every period of the input.The lower peak diode voltage in the bridge rectifier makes it more suitablefor high-voltage applications. The center-tapped transformer rectifier, in additionto including electrical isolation, has only one diode voltage drop between thesource and load, making it desirable for low-voltage, high-current applications.
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