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The full-wave rectifier conducts on every half cycle, whereas the half-wave rectifier conducts on every other half cycle.
- This halves the average current on each diode, halving the power dissipated by the diodes.
- It doubles the ripple frequency, making filtering easier.
- Since the ripple frequency is doubled, the peak-to-peak ripple voltage is approximately half, which means that less capacitance is required in the filter capacitor.
- Since the peak-to-peak ripple voltage is lower, the head-room between filtered and regulated voltage is less, meaning less power is dissipated by the regulator.
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Full wave rectifiers give a smaller output voltage ripple, resulting in a smoother output waveform. However, depending on the design, the output on a full wave rectifier may be slightly less (like around 0.4V less) than that of a half wave rectifier. This is normally due to the voltage drop increasing due to the presence of additional diodes in the circuit.
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What are the advantages of fully controlled rectifiers over half controlled rectifier?
Fully controlled rectifiers offer several advantages over half-controlled rectifiers, primarily the ability to control the output voltage and current more effectively. They use four thyristors, allowing for full control of both the positive and negative halves of the AC waveform, leading to improved efficiency and better performance in applications requiring variable output. Additionally, fully controlled rectifiers can provide a wider range of power factor correction and are more suitable for applications that demand precise control of power flow.
Is there any application where a center tap rectifier is preferred over a bridge type rectifier?
yes, where only 2 diodes can be used for fullwave rectification. this was the case with vacuum tube power rectifiers (e.g. 5U4 & type 80). these tubes shared a common cathode between 2 plates, the plates were connected to the ends of the secondary, the cathode supplied the rectified B+ voltage to the filter, the centre tap was grounded.
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