Difference between revisions of "TF EIM Chapt5"

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==Half Wave rectifier==
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[[Forest_Electronic_Instrumentation_and_Measurement]]
 
 
A half wave rectifier is a circuit which passes only half of the input AC waveform.
 
 
 
This is accomplished by using the diode's forward drop voltage to "clip" the AC signal.
 
 
 
 
 
Consider the following circuit
 
 
 
[[File:TF_EIM_DiodeVoltageClipper.png| 400 px]]
 
 
 
===The Transformer===
 
 
 
[[File:TF_EIM_Transformer.png| 400 px]]
 
 
 
 
 
A transformer uses inductors/coils to step voltages either up or down based on the ratio of the number of coil turns<math>N_1</math> and <math>N_2</math>.
 
 
 
 
 
Let <math>\Phi</math> represent the magnetic flux seen by the inductors due to the changing current in the primary.
 
 
 
:<math>V_{in} = N_1 \frac{d \Phi}{dt}</math> = Input Voltage on the Primary side
 
 
 
:<math>V_{out} = N_2 \frac{d \Phi}{dt} = V_{Finish} - V_{Start}</math> = Output Voltage on the Secondary
 
 
 
 
 
The ground is relative for a transfer.  You could use the "Tap" or center post as a ground and either the Start or Finish end
 
 
 
:<math>V_{\mbox{out using Tap}} = N_{Tap \rightarrow Finish} \frac{d \Phi}{dt} = V_{Finish} - V_{Tap}</math> = Output voltage between Tap and Secondary
 
 
 
Where  <math>T_{Tap} =</math> ground
 
 
 
 
 
Since both coils see the same flux
 
 
 
:<math>\frac{d \Phi}{dt} = \frac{V_{in}}{N_1}= \frac{V_{out}}{N_2}</math>
 
 
 
 
 
:<math>\frac{V_{out}}{V_{in}}= \frac{N_2}{N_1}</math>
 
 
 
If <math>N_2 > N_1</math> you have a step UP (Voltage increasing) Transformer
 
 
 
If <math>N_2 < N_1</math> you have a step DOWN (Voltage decreasing) Transformer
 
 
 
== The Clipping Circuit==
 
 
 
[[File:TF_EIM_DiodeVoltageClipper.png| 400 px]][[File:TF_EIM_DiodeOutputVoltageClipper.gif| 200 px]]
 
 
 
 
 
AS long as the input voltage does not exceed the reverse
 
 
 
==Constant DC with Ripple==
 
[[File:TF_EIM_Lab10_HW_Rectifier.png| 400 px]][[File:TF_EIM_Lab10_HW_VoltageRectifier.png| 400 px]]
 
 
 
==Full wave==
 
 
 
[[File:TF_EIM_Lab10_FW_Rectifier.png| 400 px]][[File:TF_EIM_Lab10_FW_VoltageRectifier.png| 400 px]]
 

Revision as of 16:16, 23 February 2011