what is thyristor firing circuit? and how of the operation??

Question

may i know what different of this 3 thyristor firing circuit:
1)short pulse
2)pulse-train generator
3)long pulse

thanks for answer^_^

Answer 1

A thyristor is a semiconductor device also known as a silicon controlled rectifier (SCR). It has three electrodes, an anode, cathode and gate (control electrode). When the anode is positively charged with respect to the cathode no current will flow until a pulse, provided by a firing circuit, is applied to the gate. The thyristor will remain conductive until the voltage in the device drops to zero.

A firing circuit is a device which converts an input signal; current, voltage or potentiometer into an output signal which will fire a triac or thyristor.
Short pulse is one pulse; like a lamp on off
Pulse-train generator is drive firing of repetitive pulses
long pulse is manipulating the current time cycle

Answer 2

A thyristor is a PNPN device also known as SCR or silicon controlled rectifier. It's VI charecteristics is like an S with long linear head on a sharp bent. Usually it is used in motor control. You can make it operate in the linear region by applying the right inputs to the P N and P junctions. You connect the input voltage to the P junction and the control voltage from the armature to the N junction and make the thyristor operate in the linear region. If for any reason the armature voltage decreases then the motor stops. Either the N or P junction can be used for different control actions together or singly depending on the number of reference voltages needed for the particular control action.

Answer 3

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