Difference between revisions of "TF EIM Chapt5"

Revision as of 16:16, 23 February 2011

Forest_Electronic_Instrumentation_and_Measurement

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-==Half Wave rectifier==
+[[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]]

Difference between revisions of "TF EIM Chapt5"

Revision as of 16:16, 23 February 2011

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