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Introduction
This page describes the operation of the three-phase semi-controlled rectifier.
When a semi-controlled rectifier is used, the output of the bridge is controlled
when it remains positive. If it tends to become negative, the output is clamped
to zero volt through the free-wheeling action of the diodes.
Fig. 1
The circuit of the semi-controlled bridge rectifier is shown in Fig. 1, and
this circuit contains three-SCRs and three diodes. It is possible to configure
the circuit in two more ways. For example, the top-half can contain the diodes
and the bottom half the SCRs. Alternatively, six SCRs can be used as in the
case of the fully-controlled bridge rectifier and an additional diode can
be connected from the negative rail to the positive rail of the bridge, with
the anode connected to the negative rail and the cathode to the positive rail.
The operation of this circuit is different from that of the circuit displayed
above.
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