Single phase half wave controlled rectifier with r-l load
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rl load is Conner with capacitor by parallel combination it work as filter circuit which help to convert AC to DC
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Figure above shows the single phase half wave rectifier with RL Load.
Normally motors are inductive loads
L= armature of field coil inductance
R= Resistance of coil.
In positive half cycle, SCR starts conduction at firing angle “α”.Drop across SCR is small & neglected so output voltage is equal to supply voltage.Due to ‘RL’ load, current through SCR increases slowly.At ‘π’, supply voltage is at zero where load current is at its max value.In positive half cycle, inductor stores energy & that generates the voltage.In negative half cycle, the voltage developed across inductor, forward biases SCR & maintains its conduction.Basically with the property of inductance it opposes change in current.Output current & supply current flows in same loop, so all the time io=is.After π the energy of inductor is given to mains & there is flow of ‘io’. The energy reduces as if gets consumed by circuit so current also reduces.At ‘β’ energy stored in inductance is finished, hence ‘io’ becomes zero & ‘T1’ turns off.‘io’ becomes zero from ‘β’ to ‘2π+α’ hence it is discontinuous conduction.
Normally motors are inductive loads
L= armature of field coil inductance
R= Resistance of coil.
In positive half cycle, SCR starts conduction at firing angle “α”.Drop across SCR is small & neglected so output voltage is equal to supply voltage.Due to ‘RL’ load, current through SCR increases slowly.At ‘π’, supply voltage is at zero where load current is at its max value.In positive half cycle, inductor stores energy & that generates the voltage.In negative half cycle, the voltage developed across inductor, forward biases SCR & maintains its conduction.Basically with the property of inductance it opposes change in current.Output current & supply current flows in same loop, so all the time io=is.After π the energy of inductor is given to mains & there is flow of ‘io’. The energy reduces as if gets consumed by circuit so current also reduces.At ‘β’ energy stored in inductance is finished, hence ‘io’ becomes zero & ‘T1’ turns off.‘io’ becomes zero from ‘β’ to ‘2π+α’ hence it is discontinuous conduction.
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