ABSTRACT: The solar energy is converted to electrical energy by photo-voltaic(PV) cells.This energy is stored in batteries during the day time in order to be utilized whenever required. This project is designed to use solar energy for household loads using Inverer. This project deals with a controlled charging mechanism which protects over charge, deep discharge and under voltage of the battery.A solar inverter, or PV inverter, converts its direct current (DC) output of a photovoltaic solar panel into a utility frequency alternating current (AC) that can be fed into a commercial electrical grid or used by a local, off-line electrical network. In this project, the solar energy is stored in the battery from Photo Voltaic cells. This stored energy of battery is converted in of linemode to AC supply of 50 Hz frequency using PWM inverter IC with MOSFET gate by driver IC to driver a half MOSFET bridge and a step-up transformer.A set of op-amps are used as comparators to continuously monitor panel voltage, load current, etc. Indications are also provided by a green LED for fully charged battery while a set of red LEDs indicate under charged, overloaded and deep discharge conditions.Charge controller also uses MOSFET as power semiconductor switch to ensure cutting of the load in low battery or overload condition. A transistor is used to bypass the solar energy to a dummy load while the battery gets fully charged. This protects the battery from getting over charged, Furthermore, the project can be enhanced by using microcontroller and GSM modem to communicate the status of the system to a control room via SMS.
ABSTRACT: In this project the voltage-fed high-frequency series resonant inverter with a lossless snubber capacitor and an auxiliary capacitor switched cell is used for induction heating applications. By the use of capacitor clamped half-bridge high frequency inverter, high power can be obtained for induction heating. The operation principle is based on the pulse width modulation control. Here asymmetrical duty cycle pulse width modulation control scheme is proposed. The hardware will be implemented on PIC16F877A. By the use of High frequency switching circuit the size of the inverter is reduced.
Comments