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Chapter 7 Tutorial
Connecting the Load
156
Reverse Current Loading
An active load connected to the power supply may actually deliver a reverse
current to the supply during a portion of its operating cycle. An external source
can not be allowed to pump current into the supply without risking loss of
regulation and possible damage. These effects can be avoided by preloading
the output with a dummy load resistor. The dummy load resistor should draw
at least the same amount of current from the supply as the active load may
deliver to the supply. The value of the current for the dummy load plus the
value of the current the load draws from the supply must be less than the
maximum current of the supply.