3-Handouts_Handout_2f - The D.C Power Supply Voltage Step...

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The D.C Power Supply Block diagram of a dc power supply. ± Voltage Step Down ± Electrical Isolation ± Converts Bipolar signal to Unipolar ± Half or Full wave ± Smoothes the voltage variation ± Still has some ripples ± Reduce ripples ± Stabilize the output against load variations
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Rectifier Circuits ± Basic rectifier converts an ac voltage to a pulsating dc voltage. ± A filter then eliminates ac components of the waveform to produce a nearly constant dc voltage output. ± Rectifier circuits are used in virtually all electronic devices to convert the 120 V-60 Hz ac power line source to the dc voltages required for operation of the electronic device. ± In rectifier circuits, the diode state changes with time and a given piecewise linear model is valid only for a certain time interval.
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Half-Wave Rectifier Circuit with Resistive Load For positive half-cycle of input, source forces positive current through diode, diode is on, v o = v s . During negative half cycle, negative current can’t exist in diode, diode is off, current in resistor is zero and =0 . Using CVD model, during on state of diode =( V P sin ω t)- V D0 Output voltage is zero when diode is off. Time-varying components in circuit output are removed using filter capacitor.
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Half-Wave Rectifier Circuit with Resistive Load (cont.) ± Maximum forward current = ( V P - V D0 ) /R ± Peak Inverse Voltage (PIV) = V P ± Usually the breakdown voltage is taken at least 50% larger than PIV ± Can this circuit used to rectify a 100 mV sinusoidal ? 0 for D.C component os D O D O s D O DD osD O s D O D PD O oav vv V RR V v V Rr V vV r R VV v π = < =− ++ −≥ < < ==
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Peak Detector Circuit As input voltage rises, diode is on and capacitor (initially discharged) charges up to input voltage minus the diode voltage drop.
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This note was uploaded on 01/16/2010 for the course EE ee203 taught by Professor Electronics1 during the Spring '09 term at King Fahd University of Petroleum & Minerals.

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3-Handouts_Handout_2f - The D.C Power Supply Voltage Step...

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