A single phase bridge rectifier supplied from a 120V - 50 Hz sinusoidal source is connected to an inductive load. The general expression of the RMS AC component of the current is given below where Vm is the maximum input voltage. If R = 500 Q and L = 1H, then the current ripple factor RF, would be equal to: %3D 4Vm IAC = V2. 1. R2 + (2wL)2
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- A dc power supply is to be developed by employing an ac to dc converter as a power processing converter for 180 watts highly inductive load. The rms value of the input ac phase voltage is 230 V at 50 Hz frequency. Select a suitable rectifier circuit having improved ripple factor and power factor for this application. The output dc voltage is assumed (245). The output dc voltage should be multiplied with ‘0.5’ if it exceeds the 200 V.A dc power supply is to be developed by employing an ac to dc converter as a power processing converter for 180 watts highly inductive load. The rms value of the input ac phase voltage is 230 V at 50 Hz frequency. Select a suitable rectifier circuit having improved ripple factor and power factor for this application. The output dc voltage is assumed to be (245). The output dc voltage should be multiplied with ‘0.5’ if it exceeds the 200 V.Three-phase half wave rectifier supply resistive load with DC power of 4 kW; the ammeter connected with D1 indicates 8 A r.m.s current, and the source frequency is 50 Hz Due to system inductance the average voltage drops to 96.2% of idealized value ( when the inductance is neglected). How much will the average and r.m.s voltage s be? The r.m.s phase current and average load current Is=? & Idc=? The secondary r.m.s voltage and transformer capacity Vs & KVA? The inductances causes the voltage drop Lc=? The diode forward current and maximum inverse voltage? Now, if the phase B is failed ( disconnected), how much with new dc voltage be in %..Vdc=….% ??(i) A fully-controlled single-phase bridge rectifier is supplied from a 50Hz, 220/120 V transformer .The rectifier supplying a highly inductive load of 10 Ohm resistor. For a firing angle of 45º, determine the rectified voltage, the rectified current and the power factor. (ii) If the current extinction angle β =200˚; Determine whether the current is continuous or discontinuous (iii) Sketch the appropriate load voltage and load current waveform
- A FW rectifier is required to deliver 48VDA with 10% ripple on a 7.5Ω resistor. a)Identify the capacitor providing these values (capacitance and ripple current - ripple current). b)Identify the necessary welding transformer for 120VAA 60Hz welding.c) Find the required serial inductance value for continuous current withdrawal from the sourceQ ) For the full- wave uncontrolled rectifier circuit supplying a series resistive Thesupply voltage is v =300 sinωt , the supply frequency is 50 Hz and the loadparameter values are: R =05 Ω,a) Sketch the diagram of electrical circuitb) Sketch the load voltage and current waveforms .c) Calculate the load currentd) Calculate the average DC load voltage Vdc .e) Calculate the supply power to the loaQ ) For the full- wave uncontrolled rectifier circuit supplying a series resistive The supply voltage is v =300 sinωt , the supply frequency is 50 Hz and the load parameter values are: R =05 Ω, a) Sketch the diagram of electrical circuit b) Sketch the load voltage and current waveforms . c) Calculate the load current d) Calculate the average DC load voltage Vdc . e) Calculate the supply power to the load.
- FACTS: AC-DC converters take the AC power from wall outlets and convert it to unregulated DC. These power supplies include transformers that change the voltage of the AC that comes through wall outlets, rectifiers to save it from AC to DC and a filter that removes noise from the peaks and troths of the AC power waves.The DC-to-AC Converters are used to charge the batteries in the vehicles. These circuits are mainly used for driving low-power AC motors and are used in a solar power system. The DC to AC converters can be used in dc transmission lines for transmitting power to loads. QUESTION: What do you think is the main reason why we have AC power in our outlets instead of DC power? Explain your answer.Design a +40 volt dc power supply for your sound system. Your sound system requires a 400 watt capability. The power supply is energized from a three-wire 110 Vrms 60 Hz power line that meets the National Electric Code (NEC). The system block diagram and design specifications are given below. Input is a 110 Vrms60 Hz. Output voltage is 40 volts, unregulated. Maximum allowable ripple is 2% Use a full-wave bridge rectifier. Use a transformer Assume diodes with VF= 0.7 volts Your design should include: Ø Well-labeled circuit diagram of what goes in the “Your Design” box. There should be enough detail such that someone could build an operational prototype. Polarities of key components are important Ø Key design equations and supporting calculations. Show your work! Ø Component specifications including: (a) Transformer-turns ratio (b) Effective value of the audio system load resistor (speaker impedance) and load current for a 400 watt, 40 volt…In the Boost DA-DA converter circuit, given below; 1) Source voltage (E) value: In the voltage range [ AB ] (Volts) 2) Switching frequency (f) value: M kHz 3) Voltage between load terminals (Vload) F (Volt) 4) Capacitance value 470 (uF) 5) Pload 2 H (Watts) consumed per load The lowest L inductance value that can keep the DC-DC converter in continuous current condition under Which option do you see below as pH ? A = 10 Volts B = 19 Volts M = 23kHz F = 26 Volts H = 8 Watts
- A 23-V, 50 Hz, 1-ph supply is feeding the following loads which are connected across it.(i) A motor load of 4 kW, 0.8 lagging p.f. (ii) A rectifier of 3 kW at 0.6 leading p.f.(ii) A lighter-load of 10 kVA at unity p.f. (iv) A pure capacitive load of 8 kVA Determine te capacitance of the capacitor at (a) pf = 0.92 lagging (b) pf = 0.95 leading (c) pf = unity4. A single phase half-wave rectifier is connected to a 300V RMS 50Hz AC supply. If the rectifier is used to supply a resistive load of 500 Ohms. Calculate the equivalent DC voltage developed across the load, the load current and power dissipated by the load3)This MCQ QUESTION FROM BASIC POWER ELECTRICAL ENGINEERING course.