A Single SCR Circuit
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This chapter describes a circuit with a single SCR. It is similar
to the single diode circuit, the difference being that an SCR
is used in place of the diode. Most of the power electronic applications
operate at a relative high voltage and in such cases, the voltage
drop across the SCR tends to be small. It is quite often justifiable
to assume that the conduction drop across the SCR is zero when
the circuit is analysed. It is also justifiable to assume that
the current through the SCR is zero when it is not conducting.
It is known that the SCR can block conduction in either direction.
The explanation and the analysis presented below is based on the
ideal SCR model. It is also assumed that the reader knows how
an SCR operates.
The next chapter shows how the behaviour of this circuit can
be changed by adding a free-wheeling diode.
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