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Zorluk: OrtaDiodes

A technician is troubleshooting a power supply circuit featuring a full-wave bridge rectifier composed of four standard silicon diodes. During each single half-cycle of the alternating current (AC) input signal, how many of the four diodes conduct current simultaneously through the load?

  1. A
    Only one diode conducts while the remaining three diodes stay idle.
  2. Two diodes conduct while the remaining two diodes are reverse-biased.Cevap
  3. C
    All four diodes conduct simultaneously in parallel to share the load current.
  4. D
    Three diodes conduct in series while one diode blocks the return path.

Cevap

Two diodes conduct while the remaining two diodes are reverse-biased.
In a standard four-diode bridge rectifier, alternating current (AC) is converted to pulsating direct current (DC) by routing current through pairs of diodes. During any given half-cycle, two diagonally opposite diodes are forward-biased and conduct current through the load in a single direction, while the other two diodes are reverse-biased and block conduction.

Adım Adım Çözüm

1
Analyze the bridge rectifier circuit topology under an AC input half-cycle
One AC input terminal is positive with respect to the other terminal.
AC voltage alternates polarity every half-cycle, determining the bias conditions of each diode in the bridge.
2
Trace the current flow through the forward-biased diodes and the load
Current enters the bridge, passes through one forward-biased diode, travels through the load resistor, and returns through a second forward-biased diode to the opposite AC line.
A complete circuit path requires a forward and return path through the bridge network.
3
Determine the state of the remaining two diodes
The opposite pair of diodes experiences reverse bias and blocks current flow.
Diodes only conduct when their anode is more positive than their cathode.

Anahtar Kavram

Full-Wave Bridge Rectification and Diode Conduction Pairs
Tahmini Süre:1m 0s
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