• An equivalent circuit is a
combination of elements properly chosen to best represent
the actual terminal
characteristics of a device, system or such a particular operating
region.
• Then device symbol can be
replaced with the equivalent circuit which makes the
analysis of the circuit easy and
straight forward.
Piece wise linear equivalent circuit
One technique for obtaining
equivalent circuit is to approximate the characteristics of the
device by straight line segments
• Rd defines the resistance level
of the device when it is in the ON state.
• Ideal diode is included to
establish that there is only one direction of conduction
through the device.
• Since silicon semiconductor
diode does not conduct until VD of 0.7V is reached, a
battery opposing the conduction
direction is included.
Simplified
equivalent circuit
• In most of the applications,
resistance rav
is
very small in comparison to the other
elements of the network.
• Removal of this rav from the network
makes a simplified equivalent circuit.
• And an ideal diode will start
conduction for zero applied voltage.
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