Development and Simulation of a Sine-PWM Boost Inverter for Telecommunication Applications
Palash Mondal, Shib Sankar Saha
Department of Electrical Engineering, Kalyani Govt. Engineering College, Kalyani, W.B., India
Telecommunication equipment require uninterruptible 48 V d.c. power supply obtained through battery bank, which are either charged from available utility grid/ installed diesel generator or from photovoltaic solar panel in remote areas. Conventionally, 230 V single phase a.c supply for other local loads like light, fan etc. at base transceiver stations (BTS) are derived from the 48 V d.c. bus using single phase inverter and subsequently stepping it up using a transformer operating at power frequency of 50 Hz. This transformer not only causes much loss in the system, but also requires large space and increases weight of the inverter. An alternative solution can be to boost the dc voltage level to 360 V and then obtaining 230 V a.c. supply using a single phase inverter. But, conventional boost converters can’t obtain such a high voltage gain. To alleviate this problem, a single stage sine-pulse-width-modulated (SPWM) boost inverter is developed, analyzed and presented in this work. This inverter can directly obtain 230 V single phase a.c. supply from 48 V d.c. bus without any intermediate transformer, thereby, improving its efficiency and power-to-volume ratio. Performance of the inverter has been thoroughly investigated through computer simulation using MATLAB/Simulink with various types of loads and the simulated results were found in close agreement with the predicted behavior. Moreover, total harmonic distortion (THD) of output voltage has been found to be within permissible limit.
Boost-inverter; power-to-volume ratio; Sine-PWM; THD; Voltage gain