The power subsystem of CSAT2 is a completely autonomous system, dedicated to providing uninterrupted DC power to all the loads of the satellite. It is the first system to start up. Orbit manoeuvring, which involves orienting the satellite to get maximum thrust from the solar pressure, compromises energy generation and increases power requirement for reliable communication significantly. Apart from this, the system will be supporting high power consuming loads such as actuators of Attitude Determination and Control Subsystem (ADCS) and Charge Particle Monitoring circuits. Some challenges before power subsystem are limited size, continuously changing orientation of the satellite and multiple voltage buses.
Multiple voltage buses are required to support various loads, thus increasing the complexity in power distribution and management. Various DC-DC converter topologies like Buck, Boost and charge pump are implemented for generating the required voltage busses.
All the loads of the satellite need to be protected from overcurrent, overvoltage, reverse voltage and under voltage. Thus, implementation of load protection is also one of the task of Power subsystem. Driving various actuators like stepper motor for Solar Sail deployment, BLDC motor for reaction wheel which is used for orbit manoeuvring and magnetorquers for stabilisation also falls in Power’s domain.
In order to obtain maximum power from the solar panel, the charging profile of the battery won’t be followed. A Battery Monitoring System which will give status of charge, status of health and temperature is thus necessary.
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