Half Wave Rectifier Circuits Manual
HALF WAVERECTIFIERCIR CIRUITS
AIM
- To study the characteristics of Half wave rectifier with and without filter and calculate its ripple factor
COMPONENTS REQUIRED
- Diode 1N4007 1no
- Resistor 1K 1no
- Step down transformer 6-0-6 1no
- Breadboard, CRO, BNC probe, connecting wires etc….
THEORY
Rectifier is a circuit used to convert AC to DC. The rectifier element used here is a PN diode. The diode conducts only when its anode is at a higher voltage with respect to cathode. In a half wave rectifier circuit, during positive half cycle of the input, the diode gets forward biased and conducts. The current flows through the load resistance RL and voltage is developed across if. During negative half cycle of the input, the diode gets reverse biased. No current flow through the load resistance during this period of input cycle is zero. Thus a pure AC is converted to unidirectional signal. The main function of a filter circuit is to minimize the ripple content in the rectifier output. Certain electronic circuits need smooth DC voltage. A filter circuit does this function. In this circuit, a suitable single capacitor C is connected across the rectifier and in parallel with the load RL to achieve the filter section.The property of the capacitor is that it does not allow any change in voltage across its terminals. When connected across a pulsating DC voltage, it tends to smoothen out or filter out the ripples in the output voltage of the rectifier.
CIRCUIT DIAGRAM
TABULATION
PROCEDURE
- Wire the half wave rectifier circuit without capacitor after testing all components.
- Switch On mains supply. Observe the transformer secondary voltage waveform and output voltage waveform across the load resistor, simultaneously on the CRO screen. Note down the peak values.
- Calculate the ripple factor using the expression.
- Connect the capacitor filter and observe the waveforms. Note down V1 and V2 and calculate the ripple factor using the expression.
EXPECTED GRAPH
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