Programmable Simulator to test RISAT-Battery Charging Logics

摘要

Spacecraft power system plays an important role in converting solar energy into electrical power required for the spacecraft to meet the design goals. The integrated spacecraft testing must ensure that all the functions of power subsystem and its interfaces with all other spacecraft systems are performing satisfactorily. On ground, spacecraft should undergo various phases of testing including environmental tests. The use of onboard battery is restricted to certain tests, since it will have impact on the life of the battery and also it is difficult to maintain the temperature of the battery within the specified limits. Battery charge simulator is an electronic load/sink unit working in programmable constant voltage mode. It is designed to simulate the charge current varied with different terminal voltages of the battery. Such battery charge simulators are required to sink the current to simulate charge V/I characteristics of battery during testing. In this paper the concept of realizing battery charge simulator/solid state electronic load is brought out with experimental results. Unit is designed to operate in remote sense mode and with the capability to compensate 5 V drop / line. This unit will be used for evaluating power system of RISAT-1 (Radar Imaging satellite-1).