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When T 2 conducts the phase voltage v bn appears across the load until the thyristor T 3 is triggered. The load current flows through the thyristor and through the supply phase winding вЂb-nвЂ™. When thyristor T 2 is triggered at П‰ t=(5в€Џ/6О±), T 1 becomes reverse biased and turns-off. The load current flows through the supply phase winding вЂa-nвЂ™ and through thyristor T 1 as long as T 1 conducts. When the thyristor T 1 is triggered at П‰ t=(в€Џ/6 + О±)=(30В° + О±), the phase voltage V an appears across the load when T 1 conducts. The common neutral point of the supply is connected to one end of the load while the other end of the load connected to the common cathode point. The 3-phase input supply is applied through the star connected supply transformer as shown in the figure.

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The third thyristor T 3 in series with the supply phase winding acts as the third half wave controlled rectifier. The second thyristor T 2 in series with the supply phase winding вЂb-nвЂ™ acts as the second half wave controlled rectifier. The thyristor T 1 in series with one of the supply phase windings вЂa-nвЂ™ acts as one half wave controlled rectifier. The 3-PHASE HALF WAVE CONVERTER combines three single phase half wave controlled rectifiers in one single circuit feeding a common load. Three single phase half-wave converters are connected together to form a three phase half-wave converter as shown in the figure. Three phase controlled rectifiers are extensively used in high power variable speed industrial dc drives.

Filtering requirements are simplified for smoothing out load voltage and load current.

Higher output voltage ripple frequency.

They provide higher dc output voltage and higher dc output power.

Operate from 3 phase ac supply voltage.

Three phase converters are 3-phase controlled rectifiers which are used to convert ac input power supply into dc output power across the load.ДЇeatures of 3-phase controlled rectifiers are

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The single phase full wave controlled rectifiers provide two output pulses during every input supply cycle and hence are referred to as two pulse converters. The output ripple frequency is equal to the twice the ac supply frequency. The Three phase controlled rectifiers provide a maximum dc output of

Three phase half controlled bridge converters & fully controlled bridge converters are used extensively in industrial applications up to about 15kW of output power.

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