BeginnerTopic 5 of 104Electronics & Embedded
Rectifier circuits
Half-wave, full-wave and bridge circuits convert AC to pulsating DC.
In depth
A half-wave rectifier passes one half-cycle; a full-wave bridge uses four diodes so both halves are used, with output ripple at twice the line frequency. Output peak is V_peak minus two diode drops. Transformers and filters complete a DC supply.
Key points
- PIV rating of diodes
- Average output V_peak·2/π for full-wave
- Bridge needs no centre tap
ExampleA 12 V RMS secondary gives about 15.6 V peak DC after a bridge.
What is Rectifier circuits?
Half-wave, full-wave and bridge circuits convert AC to pulsating DC.
Why is it important to understand rectifier circuits?
Rectifiers are the first stage of nearly every AC-powered electronic device, so their output ripple and efficiency shape the whole power supply.
What is the difference between half-wave and full-wave?
Half-wave uses one half cycle and produces a lot of ripple, while full-wave and bridge circuits use both halves and give a smoother output.
Why does a bridge rectifier lose two diode drops?
Current passes through two diodes in each half cycle, so the output is about 1.4 V below the peak for silicon diodes.
How is Rectifier circuits used in practice?
Typical applications include building the input stage of a 12 V adapter for an audio amplifier, converting the mains into DC for a battery charger and choosing a bridge rectifier for a motor control board.
What should I learn before Rectifier circuits?
Study "Diode characteristics" first (topic 4 of 104 in Electronics & Embedded). It covers the groundwork this topic builds on.
What are the key points of Rectifier circuits?
PIV rating of diodes. Average output V_peak·2/π for full-wave. Bridge needs no centre tap.
Can you give an example of Rectifier circuits?
A 12 V RMS secondary gives about 15.6 V peak DC after a bridge.
What comes after Rectifier circuits?
The next topic is "Filters and smoothing", which builds directly on this one.
How difficult is Rectifier circuits?
It is classed as Beginner in Electronics & Embedded (topic 5 of 104). It is an entry-level topic. It relies only on basic school mathematics and the ideas introduced earlier in this discipline.