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Portable Generator Familiarization & Troubleshooting Guide
Section 2 • Generator Components & Systems
Rectifiers
Rectifiers, also known as diodes, are used to convert
alternating current (AC) to direct current (DC). A simple
rectifier consists of a thin film of metallic oxide which is
deposited on a thicker plate of metal, such as iron. Selenium
is often used as the metallic oxide in a rectifier.
Rectifier Operation
A copper oxide rectifier is illustrated in Figure 2.38.
Figure 2.38 — Example Of Copper Oxide Rectifier
When alternating current is applied to the opposite faces of
the two discs, current can flow from the copper to the
copper oxide face; it cannot flow in the opposite direction.
The rectifier thus permits one alternating current to pass
but blocks the reverse alternation.This action results in a
"pulsating" direct current (DC) flow. A rectifier that allows
only one alternation of current to pass is called a "blocking"
diode or "half-wave" rectifier (Figure 2.39).
Figure 2.39 — Typical Blocking Diodes
A "plug-in" type of bridge rectifier is shown in
Figure 2.40.
Notice that a varistor has been added to this rectifier, to
protect the diodes against voltage surges.
Figure 2.40 — Plug-In Bridge Rectifier With Varistor
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