Switching power supplies are increasingly applied in all parts of industry. The greater power and density and higher efficiency are the most important advantages of switched mode power supplies over their linear counterparts. New high power semiconductors such as power MOSFET and IGBTS and also new switching topologies help the designers of improve the power- to- weight ratio and the overall efficiency of switching power supplies.
In this project, a switched mode lead-acid battery charger is designed and manufactured. This battery charger has selectable output voltages for several charging modes as well as the capability of being used as a regulated power supply. Each of these voltages can be adjusted separately. The most important specification of this charger power supply is that several modules can be paralleled and the output current to the battery load is provided by all modules do that output current of them remains relatively similar. Parallel modules are connected via a current sharing bus. Other specifications are listed below.
Output Voltages in changer mode: 53.5, 55.9 and 64 V,
Output Voltage in power supply mode: 48 V,
Output Current: 10 A,
Overload Capability: 120%
Output Voltage Ripple: <100m V
Overall Efficiency: >75%