STABILITY ANALYSIS OF A BATTERY CHARGE REGULATOR FOR SATELLITE POWER SYSTEM

摘要

In this study, the stability analysis of a satellite battery charge regulator[BCR] was performed in the normal and worst case. The computer simulation of the charge loop with the SABER program showed that the phase margins of the charge loop were greater than 70 degrees at all charge rates in the normal case. In the worst case, the transfer function of the charge loop was derived by using maximum and minimum device tolerances generated over mission life, and calculated phase margin and gain margin with MATHCAD program. The phase margins were greater than 50 degrees at all charge rates for the worst case. When the charge rate was transfered from low charge rate to high charge rate, the transient response showed the results where the damping ratio increases and the settling time decreases as the charge rate increases. From these results, the charge loop stabilityof theBCR are evaluated.