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A voltage source Vs = Vm sinωt is connected in series with a resistance R and an SCR. At some firing angle delay of α a positive gate pulse is applied to the SCR which turns on the SCR. Considering ideal conditions, at the instant α the voltage at the resistor terminals Vo
The average output voltage is maximum when SCR is triggered at ωt =
In the below given circuit, the SCR is triggered at a certain firing angle α.
The load current falls to zero at ωt =
In the method of phase control, the phase relationship between ___ & ___ is controlled by varying the firing angle
In a single phase halfwave thyristor circuit with R load & Vs=Vm sinωt, the maximum value of the load current can be given by
Below shown ideal circuit is triggered at a firing angle of α. The voltage across the SCR is zero from ωt =
Below shown ideal circuit is triggered at a firing angle of α. From ωt = π to 2π+α
For a single phase thyristor circuit with R load & firing angle α, the conduction angle can be given by
For the below given circuit with firing angle α & angular frequency of ω, the circuit turnoff time in secs can be given by
A singlephase halfwave thyristor circuit with R load is triggered at an angle of α = 0°. As such, the maximum value of the average output voltage would be given byConsider Vs = Vm sinωt.
For a certain SCR configuration, the below shown waveform is obtained. Find the value of the average output voltage with α = 30° & Vs = 240 V.
A singlephase half wave circuit has Vs = 230 V with a R load of 100 Ω. Find the average load current at α = 30°.
A single phase 230 V, 1 kW heater is connected across a 1phase 230 V, 50 Hz supply through an SCR. The firing angle of the SCR is adjusted to give a rms voltage of 155 V. Find the power absorbed by the heater element.
For a single phase halfwave thyristor circuit with R load, the power delivered to the resistive load is
For a single phase halfwave thyristor circuit with R load, the input power factor is given by
For the below shown circuit,
The load voltage waveform from ωt = π to ωt = π+α = β (extinction angle) is
For the below shown circuit,
The SCR is gated at α. At ωt = π
In case of a singlephase halfwave circuit with RL load, with firing angle α and extinction angle β, the conduction angle γ can be written as
For a halfwave single phase thyristor rectifier circuit with any type of load the _______ + _________ waves must ideally give the supply voltage waveform.
In case of a singlephase halfwave circuit with RL load, with firing angle α and extinction angle β, the thyristor is reversed biased from
5 videos39 docs63 tests

5 videos39 docs63 tests
