Therefore, in accordance with the voltage level of the battery 38 and bus 40, and by varying {HEAD ~ the duty cycle} of {TAIL ~ a control signal} received by the SW1 and SW2, the battery 38 is either charged or discharged 
of
Therefore , in accordance with the voltage level of the battery 38 and bus 40 , and by varying { HEAD ~ the duty cycle } of { TAIL ~ a control signal } received by the SW1 and SW2 , the battery 38 is either charged or discharged
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH