Rectifiers

RECTIFIERS

Introduction

All electronic circuits need dc power supply from battery or power pack units.It may be economical anc convenient to depend upon battery power supply.hence, many electronic equipment contain circuits which convert ac supply into dc voltage at the required level.The unit containing these circuits is called Linear Mode Power Supply(LMPS).In certain applications, dc to dc conversion is required. Such a power supply unit that converts dc to ac or to dc is called Switch Mode Power Supply.

Rectifier

It is defined as an electronic device used for converting ac voltage into pulse rating dc voltage.It consist of PN junction diode which is polarity sensitive.when the diode is in forward bias, the diode 'D' conducts and allows the current to flow through it. It without any resistance i.e diode is on state.

When the diode is in reverse bias it doesn't conducts then no current flows through it, i.e diode is in 'off' state providing a blocking function.thus the ideal diode acts as a switch, either open or close depending upon the polarities(bias) of the voltage across it. An ideal diode has zero resistance under forward bias and under reverse bias having infinite resistance.

Rectifiers are classified into different types:

1. Half Wave Rectifier

2. Full Wave Rectifier

3. Bridge rectifier

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Comments

Full Wave Bridge Rectifier With Capacitor Filter

Full Wave Bridge Rectifier With Capacitor Filter The voltage obtained across the load resistor of the full-wave bridge rectifier described above has a large amount of ripple. A capacitor filter may be added to smooth-en the ripple in the output, as shown below. Figure 21: Full wave Bridge rectifier with capacitor filter The rectifier circuits discussed above can be used to charge batteries and to convert AC voltages into constant DC voltages. Full-wave and bridge rectifier are more commonly used than half-wave rectifier.

BLDC Motor Driven Solar PV Array with Battery Fed Automatic Irrigation System Employing Zeta Converter

Objective The main objective behind this project is to design a simple, cost effective and efficient brushless DC (BLDC) motor drive for solar photovoltaic (SPV) array fed water pumping system. The project includes automatic changeover circuit to switch power source between solar panel and battery based on the presence and absence of light. The pump works on the signals received by the sensors used for automatic irrigation system. Abstract This project proposes a simple, cost effective and efficient brushless DC (BLDC) motor drive for solar photovoltaic (SPV) array fed water pumping system. A zeta converter is utilized in order to extract the maximum available power from the SPV array. The proposed control algorithm eliminates phase current sensors and adapts a fundamental frequency switching of the voltage source inverter (VSI), thus avoiding the power losses due to high frequency switching. No additional control or circuitry is used for speed control of the BLDC motor. The

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