Chapter 7 Tutorial
Output Characteristics
148
Figure 7-6. Simplified Diagram of Common Mode and Normal Mode Sources of
Noise
When the load changes very rapidly, as when a relay contact is closed, the inductance
in the hook up wire and in the power supply output will cause a spike to appear at the
load. The spike is a function of the rate of change of the load current. When very rapid
changes in load are expected, a capacitor with a low series resistance, in parallel with
the power supply, and close to the load is the best way to minimize these voltage
spikes.
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