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DC Current Mode Control of Forward DC to DC Converter

Author(s):

K.H.Sivanand , BCET; M.Savitha, SSEC; K.Gopinath, SSEC

Keywords:

Forward converter, PWM controller, MOSFET

Abstract

The purpose of this project is to implement MOSFET based high precision low size prototype DC-DC converter for battery charging applications. Because of the disadvantages of linear power supplies, now most of the power supplies are replaced by switching mode power supplies (SMPS). In linear power supplies, a low-frequency (60-Hz) transformer is required. Such transformers are large in size and weight compared to high-frequency transformers. The transistor operates in its active region, incurring a significant amount of power loss. Therefore, the overall efficiencies of linear power supplies are usually in a range of 30-60%. Any SMPS basic requirements are Isolation between the source & the load, High-power density for reduction of size and weight, Controlled direction of power flow, High conversion efficiency, Input & output wave forms with a low harmonic distortion for small filters and Controlled power factor (PF) if the source is AC Voltage. The implementation of 400V dc to 108V dc converter using forward converter will fulfill the above requirements. The main advantage for selecting this topology is used for medium power applications, high switch utilization and number of switching devices is less. In this project current mode control is used in order to get the faster response, the switching frequency is high to get reduce the transformer core size and the harmonic components is reduced. The voltage spike across the switch is proportional to the switching frequency as well as the leakage inductance. By using of the snubber circuit voltage spike across the switch is reduced. The main objective of this project is to control the current and the voltage using current mode controller. The implementation of 400V dc to 108V dc converter using forward converter includes current mode controller UC3844. This will control the gating pulses to the MOSFET at the 65 KHz switching frequency in order to get the regulated output and the input current.

Other Details

Paper ID: IJSRDV3I2672
Published in: Volume : 3, Issue : 2
Publication Date: 01/05/2015
Page(s): 1190-1195

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