Center Tapped Transformer:
A second popular full-wave rectifier appears in Fig. 2.59 with only two diodes but requiring a center-tapped (CT) transformer to establish the input signal across each section of the secondary of the transformer. During the positive portion of vi applied to the primary of the transformer, the network will appear as shown in Fig. 2.60. D1 assumes the short-circuit equivalent and D2 the open-circuit equivalent, as determined by the secondary voltages and the resulting current directions. The output voltage appears as shown in Fig. 2.60.
Fig: 2.59 Center-tapped transformer full-wave rectifiers.
Fig: 2.60 Network conditions for the positive region of vi
During the negative portion of the input the network appears as shown in Fig. 2.61, reversing the roles of the diodes but maintaining the same polarity for the volt age across the load resistor R. The net effect is the same output as that appearing in Fig. 2.56 with the same dc levels.
Fig: 2.61 Network conditions for the negative region of vi
Peak Inverse Voltage (PIV):
The network of Fig. 2.62 will help us determine the net PIV for each diode for this full-wave rectifier. Inserting the maximum voltage for the secondary voltage and vm as established by the adjoining loop will result in
PIV = V Secondary = VR
= vm + vm
and PIV 2Vm ct transformer , full-wave rectifier ………..(2.13)
Fig: 2.62 determining the PIV level for the diodes of the CT transformer full-wave rectifier
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