Sawan Sharma

In this paper, the idea of a Prepaid energy meter using a PIC16F73 microcontroller has been introduced. This concept provides a cost efficient manner of electricity billing. The present energy billing systems are discrete, inaccurate, costly and slow. They are also time and labour consuming. The major drawback of traditional billing system is power and energy theft. This drawback is reduced by using a prepaid energy meter which is based on the concept “Pay first and then use it”. Prepaid energy meter also reduces the error made by humans while taking readings to a large extent and there is no need to take reading in it. The prepaid energy meter uses a recharge card which is available in various ranges (i.e. Rs. 50, Rs. 100, Rs. 200, etc.). The recharge is done by using a keypad and the meter is charged with the amount. According to the power consumption, the amount will be reduced. An LDR (light Dependant Resistor) circuit counts the amount of energy consumed and displays the remain...

This paper presents the performance analysis of transformer less dc-dc converters to achieve high step-up voltage gain without an extremely high duty ratio. The technique used to design the equivalent circuit of these converters is switched-inductor with voltage lift circuit, allowing a boost of the input voltage to high values. In this paper describes the steady-state analysis of voltage gain for all the converters(dc-dc step up, dc-dc step dawn). For the execution of proposed converters the MATLAB/SIMULINK software has been used. Finally the comparative analysis of proposed converters with conventional boost converter which shows that proposed converters have higher voltage gain and reduced voltage stress.