Electronic Technician Certification Program Electronic Devices DIODE September
Electronic Technician Certification Program Electronic Devices DIODE September 12, 2020 CYCLE: One complete occurrence of a repeating wave (periodic signal) such as one positive and one negative alternation of a sine wave. FREQUENCY: the number of cycles of a signal occur in one second PERIOD: the time distance between two similar position on a periodic wave. WAVELENGTH: the distance traveled by an electromagnetic (radio) wave during one period Wavelength (m) = (300 x 108 m/s ) / f (HZ) where 300 x 108 m/s is speed of light
Electronic Technician Certification Program SINE WAVE ( display on the Oscilloscope) • in display 1 V/division • Vpk=3 V • Vpk-pk=6 V = 2 x Vpk • Vrms = 0. 707 x Vp • Vrms = 2. 12 V • Vavg = 0. 637 x Vpk • in display 1 msec/division • Period T = 7 msec • Frequency F = 1/T • F = 1/ 7 msec= 142. 8 HZ Period T: complete one cycle • T=1 / F in this formula T=second, F= frequency in Hertz • or F = 1 / T • Frequency is the number of cycles of a given waveform that occur in one second
Electronic Technician Certification Program DIODE PN Junction P type - - - + + N type Depletion region Semiconductor Diode DIODE Symbol Anode A Cathode C Diode Voltage VD=VA – VC Voltage across Diode normally permit electron current flow only in one direction
Electronic Technician Certification Program IDEAL Permit current flow from Anode to Cathode (Diode ON or Forward Bias): ideal Diode VD=VA-VC = 0 V REVERSE BIAS: Diode OFF Open circuit No current flow from A to C Resistance from A to C = infinity Ohm ( )
Electronic Technician Certification Program
Electronic Technician Certification Program #1 Vout Calculate: Given VD=0. 7 V 1. Diode on or off ? 2. Vout 3. Current I 4. V across R I #2 Vout Calculate: Given VD=0. 7 V 1. Diode on or off ? 2. Vout 3. Current I 4. V across R
Electronic Technician Certification Program #3 Calculate: Given VD=0. 7 V 1. Diode on or off ? 2. Current I #4 Calculate: Given VD=0. 7 V Diode is forward biased or reverse biased ?
Electronic Technician Certification Program ZINER DIODE February 11, 2021 Breakdown Diode Normal Diode - 0. 7 V + A major application for zener diodes is as a type of voltage regulator for providing stable reference voltages for use in power supplies, voltmeters, and other instruments.
Electronic Technician Certification Program ZINER DIODE February 11, 2021 vout 20 V EXAMPLE For the circuit shown, given VZ=10 V (a) What is Vout if Vin=20 VDC (b) What is the current through 220 Ohm resistor (c) If Vin=-5 V, what is Vout (d) What is the current through 220 Ohm resistor
Electronic Technician Certification Program ZINER DIODE February 11, 2021 Vout VZ=12 V 490 EXAMPLE For the circuit shown, solve for NO Load RL (a) IL (b) IZ (c) vout (d) IL with Load (e) IZ with Load
Electronic Technician Certification Program ZINER DIODE February 11, 2021 vout 3 V VZ=3 V vout VZ=3 V Draw vout waveform for the above circuits
Electronic Technician Certification Program ZINER DIODE February 11, 2021 vout Draw vout waveform for the above circuit
Electronic Technician Certification Program ZINER DIODE February 11, 2021 Draw vout waveform for the above circuit
Electronic Technician Certification Program ZINER DIODE February 11, 2021 Draw vout for the above circuit
Electronic Technician Certification Program ZINER DIODE February 11, 2021 The Light-Emitting Diode (LED)
Electronic Technician Certification Program ZINER DIODE February 13, 2021
Electronic Technician Certification Program Half-wave Rectifier February 13, 2021
Electronic Technician Certification Program Half-wave Rectifier February 13, 2021
Electronic Technician Certification Program Half-wave Rectifier February 13, 2021 t(ms) Ideal Diode Vd = 0 V Vout RL T(period)
Electronic Technician Certification Program Transformer February 13, 2021 Transformer • Transform one voltage to the other • Primary voltage: Vp and Secondary voltage: Vs • Np = number of turns in primary and Ns: number of turns in Secondary • Np / Ns = Vp / Vs then Vs = ( Ns x Vp ) / Np • if Ns > Np = Step-up and Ns < Np = Step-down
Electronic Technician Certification Program Half-wave Rectifier February 13, 2021 EXAMPLE For the circuit shown determine: a) The peak secondary voltage vp(sec) b) The rectified peak output vp(out) c) If input frequency is 1 k. Hz what is the frequency of output
Electronic Technician Certification Program Full-wave Rectified February 13, 2021 Vs/2 Vp Vs/2 • The DC average: VDC = 2 x Vp / 6. 284 • Fout = 2 Fin • Ideal Diode Vd=0 V • Practical Diode Vd=0. 7 V and VP(out) = Vp(in) – 0. 7
Electronic Technician Certification Program Full-wave Rectified February 13, 2021 The Center-Tapped Full-wave Rectified
Electronic Technician Certification Program Full-wave Rectified February 13, 2021 The Center-Tapped Full-wave Rectified
Electronic Technician Certification Program Full-wave Rectified February 13, 2021 The Center-Tapped Full-wave Rectified
Electronic Technician Certification Program Full-wave Rectified February 13, 2021 The Center-Tapped Full-wave Rectified
Electronic Technician Certification Program Full-wave Rectified February 13, 2021 The Center-Tapped Full-wave Rectified
Electronic Technician Certification Program Full-wave Rectified February 13, 2021 The Center-Tapped Full-wave Rectified
Electronic Technician Certification Program Full-wave Rectified February 13, 2021 The Center-Tapped Full-wave Rectified EXAMPLE For the circuit shown, calculate a) Vp(sec) b) Show the voltage waveform across each half of the secondary winding and across RL
Electronic Technician Certification Program Full-wave Rectified February 13, 2021 EXAMPLE continue The Center-Tapped Full-wave Rectified
Electronic Technician Certification Program The Bridge-Rectifier February 13, 2021 Vp Vout Vp Vs
Electronic Technician Certification Program The Bridge-Rectifier February 13, 2021
Electronic Technician Certification Program The Bridge-Rectifier February 13, 2021
Electronic Technician Certification Program The Bridge-Rectifier February 13, 2021
Electronic Technician Certification Program The Bridge-Rectifier February 13, 2021 EXAMPLE For the bridge-rectifier circuit below, the transformer is specified to have a 12 V rms secondary voltage for the standard 110 V across primary. Determine the peak output voltage
Electronic Technician Certification Program The Capacitor-Input Filter February 13, 2021
Electronic Technician Certification Program The Capacitor-Input Filter February 13, 2021
Electronic Technician Certification Program The Capacitor-Input Filter February 13, 2021
Electronic Technician Certification Program The Capacitor-Input Filter February 13, 2021
Electronic Technician Certification Program The Capacitor-Input Filter February 13, 2021
Electronic Technician Certification Program The Capacitor-Input Filter February 13, 2021
Electronic Technician Certification Program The Capacitor-Input Filter February 13, 2021 EXAMPLE For the above circuit, determine: a) Vp(pri) b) Vp(sec) c) The unfiltered peak full-wave rectified voltage d) Frequency Output
Electronic Technician Certification Program THE E N D
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