Wave simulation

Pr. Half Wave Rectifier

 

AIM: To observe waveform at the output of half wave rectifier with and without filter capacitor. To measure DC voltage, DC current, ripple factor with and without filter capacitor

Appratus Required

1. Breadboard
2. Ammemeter, Voltmeter
3. Step Down Transformer  
4. Diode 1N4007 
5. Resistor 10K 
6. Capacitor 1000μF
7. Oscilloscope

Theory: One of the very important applications of diode is in DC power supply as a rectifier to convert AC into DC. DC Power supply is the important element of any electronic equipment. This is because it provides power to energize all electronic circuits like oscillators, amplifiers and so on. In electronic equipments, D.C. power supply is must. For example, we can’t think of television, computer, radio, telephone, mobile as well as measuring instruments like CRO, multi-meter etc. without DC power supply. The reliability and performance of the electronic system proper design of power supply is necessary. The first block of DC power supply is rectifier. Rectifier may be defined as an electronic device used to convert ac voltage or current into unidirectional voltage or current. Essentially rectifier needs unidirectional device. Diode has unidirectional property hence suitable for rectifier. Rectifier broadly divided into two categories: Half wave rectifier and full wave rectifier. In this experiment, you will construct half wave rectifier. 

Working principle of half wave rectifier: In half wave rectifier only half cycle of applied AC voltage is used. Another half cycle of AC voltage (negative cycle) is not used. Only one diode is used which conducts during positive cycle. The circuit diagram of half wave rectifier without capacitor is shown in the following figure. During positive half cycle of the input voltage anode of the diode is positive compared with the cathode. Diode is in forward bias and current passes through the diode and positive cycle develops across the load resistance RL. During negative half cycle of input voltage, anode is negative with respected to cathode and diode is in reverse bias. No current passes through the diode hence output voltage is zero.

Observations: 

[1] Without filter capacitor 

    AC Input voltage (rms) Vrms= ___________ 

    DC output voltage VDC = ___________ 

    DC current: IDC =______________ 

    AC output voltage (Ripple voltage) Vr: __________ 

    Ripple factor: (Vr/VDC) = ______________ 

[2] With filter capacitor 

    AC Input voltage (rms) Vrms= ___________ 

    DC output voltage VDC = ___________ 

    DC current: IDC =______________ 

    AC output voltage (Ripple voltage) Vr: __________ 

    Ripple factor: (Vr/VDC) = ______________