### Single– φ Half Wave Controlled Rectifier (R Load) A thyristor T, a voltage source Vs, and a resistive load R make up the circuit. The thyristor T is forward biassed during the positive 1/2 cycle of the input voltage, but it does not behave until a gate signal is sent to it. The thyristor T is turned on and begins to conduct when a gate pulse is applied to it at t =. The input voltage is transferred out to the load when the thyristor is turned on. The thyristor T becomes opposite biassed and is turned off during the negative half of the cycle. As a result, the load only receives voltage at some point during the positive 1/2 of the cycle.

By varying the firing angle, the common price of output voltage can be varied. 101 – Half Wave Controlled Rectifier (R Load). Throughout the thyristor, the waveform depicts the plot of input voltage, output voltage, gate current, output current, and voltage.

### Single– φ Half Wave Controlled Rectifier (RL Load) A thyristor T, a voltage source Vs, an inductive load L, and a resistive load R are all part of the circuit. The thyristor T is forward biassed during the effective 1/2 of cycle of the input voltage, but it does not conduct until a gate signal is sent to it. The thyristor T is turned on and begins to conduct when a gate pulse is applied to it at t =.

The entry voltage is transported out to the load when the thyristor is turned on, but the current through the load builds up slowly due to the inductor in the load. The thyristor T is opposite biassed throughout the negative 1/2 of the cycle, however the current through the thyristors isn’t always 0 due to the inductor.

### Single– φ Half Wave Controlled Rectifier (RL Load)

The current through the inductor gradually decays to zero, and when the load current (i.e. the current through the thyristor) falls below the holding current, the inductor is turned off. So the thyristor will conduct for some time in the negative half of the cycle before turning off at t =. Extinction angle is the name given to this angle.

Conduction angle is defined as the time interval between and. As a result, the load receives the best voltage at some point during the positive half of the cycle and for a brief period during the negative half of the cycle. Changing the firing angle can change the common price of output voltage.

### Single– φ Half Wave Controlled Rectifier (RL with FD)

A thyristor T, a voltage source Vs, a diode FD throughout the RL load, an inductive load L, and a resistive load R are all part of the circuit. The thyristor T is forward biassed throughout the positive 1/2 of the input voltage cycle, but it does not conduct until a gate signal is sent to it.

The thyristor T is turned on and begins to conduct when a gate pulse is applied to it at t =. The input voltage is transmitted out to the load when the thyristor is turned on, but the current through the load builds up slowly due to the inductor in the load. The thyristor T is reverse biassed during the negative 1/2 of the cycle. The load current shifts its course from the thyristor to the freewheeling diode at this instant, i.e. at t =. The thyristor goes off when the current is switched from the thyristor to the freewheeling diode. ### Single– φ Half Wave Controlled Rectifier (RL with FD)

Through the loop R freewheeling diode – L, the current through the inductor progressively decays to zero. As a result, the thyristor will no longer conduct in the negative half of the cycle and will turn off at t =. As a result, the load receives the best voltage at some point during the positive 1/2 of the cycle.

The common price of output voltage can vary depending on the firing angle. Throughout the thyristor, the waveform depicts the plot of input voltage, gate current, output voltage, output current, and voltage. This circuit has several modes. (a) Mode of Conduction (b) Freewheeling Mode.  