GATE Electrical – Analog Electronics
Page 3: Basic Diode Rectifier Circuits
After understanding the PN Junction diode theory, the next step is to study how the diode is used in practical circuits. The most important application of a diode is converting AC voltage into DC voltage. This process is called Rectification.
1. What is a Rectifier?
A Rectifier is an electronic circuit that converts Alternating Current (AC) into Direct Current (DC).
Rectifiers are widely used in:
- Power supplies
- Battery charging circuits
- Adapters and chargers
- Electronic equipment
2. Half Wave Rectifier
The Half Wave Rectifier is the simplest rectifier circuit. It uses one diode to convert AC into pulsating DC.
Circuit Operation
- During the positive half cycle, the diode becomes forward biased.
- Current flows through the load resistor.
- During the negative half cycle, the diode becomes reverse biased.
- No current flows.
Therefore, only the positive half of the input AC signal appears across the load.
Average Output Voltage
Vdc = Vm / π
Where:
- Vm = Maximum value of input voltage
- Vdc = Average DC output voltage
3. Full Wave Rectifier
A Full Wave Rectifier converts both positive and negative halves of AC into DC. Therefore, it is more efficient than a half wave rectifier.
Types of Full Wave Rectifiers
- Center Tapped Rectifier
- Bridge Rectifier
Average Output Voltage
Vdc = (2Vm) / π
This means the DC output voltage of a full wave rectifier is twice that of a half wave rectifier.
4. Efficiency Comparison
| Rectifier | Efficiency | Ripple |
|---|---|---|
| Half Wave Rectifier | 40.6% | High |
| Full Wave Rectifier | 81.2% | Low |
5. Important GATE Points
- Half wave rectifier uses only one half cycle.
- Full wave rectifier uses both half cycles.
- Full wave rectifier has higher efficiency.
- Ripple in half wave rectifier is higher.
Next Page → Clipper and Clamper Circuits
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