Diode approximations

Posted by AJ On Tuesday, 9 July 2013 0 comments

· In the approximate model of diode, the rav is not used since the value of this rav is

much less than other series elements of the network.

· This model results in less expenditure of time and effort to obtain results.

· Unless otherwise mentioned this approximate model is used hereforth…

Series diode configuration with DC inputs

• When connected to voltage sources in series, the diode is on if the applied voltage is

in the direction of forward-bias and it is greater than the VT of the diode

• When a diode is on, we can use the approximate model for the on state

Series diode configuration

Here, VD = VT, VR = E - VT

ID = IR = VR / R

Here, VD = E, VR = 0, ID = 0

Keep in mind that KVL has to be satisfied under all

Conditions

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