Draw a neat diagram of 1Ф half wave controlled converter with RL load. Give its operation.

Draw a neat diagram of 1Ф half wave controlled converter with RL load. Give its operation.

Single phase fully controlled half wave converter:

Single phase fully controlled half wave converter:

Mode 1: (0 to α) (+ve half cycle) SCR anode is positive w. r. t. cathode but gate pulse is not applied therefore SCR is in off state though it is forward biased. The load current is zero & load voltage is also zero.

Mode 2: (α to π) (+ve half cycle + gate signal is applied at α) SCR is forward biased and gate signal is applied, therefore SCR turns on at α.

When SCR is triggered the load current will increase in a finite time through the inductive load. The supplied voltage from this instant appears across the load. Due to the inductive load the increase in current is gradual, energy is stored in inductor during α to π .

Mode3: (π to 2 π) (negative half cycle) During this part of negative half cycle, current continues to flow but falls and finally becomes zero when the energy stored in the inductance is dissipated in the load resistor and a part of the energy is feedback to the source, Hence due to energy stored in inductor, current continues to flow up to instant ωt = β. Thus during interval from ωt = π  to ωt = β, the negative supply voltage appears across the load. When the load current becomes zero, due to negative supply voltage, the SCR is turnd off. At instant ωt = π+ α , when again pulse is applied, the SCR is turned on & the above cycle is repeated.

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