This paper takes the electric car’s power battery (VRLA battery cell) as the research object, for realtime monitoring problem of power battery's state of charge (SOC) and remaining time, The system adopts micro control unit (MCU) 89S51 and AD974 to control battery discharge in constant current, Through the measurement of a periodic, get Series of working voltage, using phase-slope calculation m...

A grounded constant current source employing a single oper-j; >; -2y, = &g i (2kk+ 1). (A9 ationd amplifier is discus&. It is shown that improved bandwidth and k k I reduced slew rate limitations are obtained with this: circuit. Similarly the second product can be shown to be given by I: INTR~DUCDON fi xj’ 1 2k+l ( > N!(N+ l)! Circuit 1 of Fig. 1 is a commonly used single OP AMP j=k+ 1 X,‘-Xk’ ...

This thesis describes the forming process under constant current conditions of Cr/pa-Si:H/V thin film devices (a-Si:H denotes hydrogenated amorphous silicon). In the initial stages of electro-forming by constant current stressing, with increasing injection of charge via either increasing bias or time, the J V characteristics of devices exhibit an instability, as shown by a decrease in the rever...