Input current ripple from a switching power supply contains considerable low order harmonics, necessitating extra design efforts for reducing the amount of electro magnetic interference.This paper presents a boost converter achieving input current ripple reduction by the proper designing of inductors.This is achieved with minimal number of components.The high voltage gain of this converter eliminates boosting transformers from the circuit.This converter is best suited for renewable energy applications where continous current with minimum ripple is essential.A comparison of switching of the converter with another switching scheme has been obtained for validation. Better line and load regulation is achieved by implementing a closed loop control.Index Terms-Current ripple cancelation, dc/dc converters, pulsewidth modulation.
This paper presents the comparison between the performance range of conventional and Quasi Resonant Single Ended Primary Inductor Converter (SEPIC) topology. Here the modified topology is the combination of the quasi resonant characteristics and the SEPIC converter topology. A Wide input (3.6-7.2V) and wide output (3-9) voltage ranges are obtained satisfactorily for the high frequency operation. Since converter designed for high frequency applications, Zero voltage Switching (ZVS) is ensured. By using this SEPIC topology the wide step up and step down conversion with high frequency is possible for low power applications. It will reduce the size, weight and losses of the converter and improves the transient response and it is effectively suitable for light load operations.
Electric 3-wheeler Rickshaws are the most economical among battery powered electric vehicles. They cost INR 1,20,000 (USD 1615) to buy, including the price of a 48V100Ah deep cycle battery @ INR 20,000 (USD 270) and run around 80 KM on a single charge. No wonder there are already 15,00,000 E Rickshaws in India alone. These E-Rickshaws use Lead acid tubular or flat plate batteries, which cost less than half the price of an equivalent Lithium Battery & have a service life of around 600-800 cycles of 80% discharge & recharge if maintained properly. However, with conventional chargers, the Lead Acid Batteries require 6-7 hours for 80% recharge and 10 hours for a full recharge after a discharge of 80% of rated capacity. Faster recharge increases battery temperature, copious gas evolution & reduces its life. This has been a disadvantage for lead acid batteries in EVs. Lithium-Ion battery requires 2 hours for 80% recharge and 3 hours for a full or recharge. The objective of the research work was to try out and develop a charger, which can fast recharge E Rickshaw battery up to 80% of capacity in lesser charging time without increasing battery temperature or gassing, avoiding battery service life reduction. Method of fast charging was to continuously explore the charge acceptance limits of battery and feed it with optimum charging current so as not to increase temperature & gassing. The unique fast charger requires only 3 hours & 30 minutes to recharge the battery to 80% of its capacity, while temperature rises by 3°C to 4°C, less than half of that in normal charging process. In addition, a super-fast "opportunity charge" during one-hour lunchtime, injects 35% energy in 65 minutes, giving E Rickshaws an extra 35 KM run each time. It is proven that service life is same or more. The fast charger prototypes were successfully field tested on 40 vehicles each at Kolkata & Baharampur in West Bengal, India, to the entire satisfaction of the E Rickshaw drivers. It is now in mass production & sales. Lead Acid batteries in E-Rickshaws, E-Bikes, golf carts & electric trucks are discharged and recharged daily or more. A safe & fast charger increases productivity & revenue.
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