Fig. 4-1 Constant Voltage/Constant Current Characteristic
Similarly, crossover from the constant current to the constant voltage mode automatically occurs from a decrease in load. A
good example of this would be seen when charging a 12-volt battery. Initially, the open circuit voltage of the power supply may
be preset for 13.8 volts. A low battery will place a heavy load on the supply and it will operate in the constant current mode,
which may be adjusted for a 1 amp charging rate. As the battery becomes charged, and its voltage approaches 13.8 volts, its
load decreases to the point where it no longer demands the full 1 amp charging rate. This is the crossover point where the power
supply goes into the constant voltage mode.
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