What is a thyristor?
thyristor is a component of a solid state used to switch and control the flow of electric current. It is also known as a silicon rectifier (SCR), a thyristor is a robust electronic component used in high current applications. They consist of four layers of semiconductor materials of alternating semiconductors N and picked by anode, cathode and gateway. Tyristors begin to carry out when they receive the preset voltage at their terminal gateway and, subject to several variables, continue to carry out, even if the gate voltage is removed. These operational variables and the wide range of performance evaluation cause thyristors to be very useful current controllers.
Although Tyristors can be widely classified as simple current switching devices, the range of operating variables they have is very useful in a number of control applications. Basically, the Tyristors with a high current of the switching device consisting of four AC layers P and N. The anode is located on the first VRSTva p, gate terminal on the second P layer and cathode on the last n layer. When idle, there is no current transmission across the anode/cathode path. The component requires the voltage of the set values used on the gate layer to turn it on and cause the current.
The fact that the component will not be active if the gate voltage does not reach its values of the rated threshold is one of the useful variables that the thyristor has. This allows accurate checking over the component switching conditions. Once the thyristor is on, it remains active, even if the gate voltage is removed and the current passes, does not drop below the maintenance value of the component. This known retention voltage is another useful characteristic of thyristors. If the value of the anode voltage is below the holding level, the thyristor does not turn on, even if it receives the gate pulse.
Thyristors can comformally process extremely high voltage and current evaluation. They are runningThe harvest uses in the alternating current controller with zero crossing (AC), power supply, controllers with phase burning and long -distance transfer devices. This latest application contains huge thyristor banks arranged in the Graetz bridge configurations that are able to reliably switch the power of several megawatts (1,000,000 watts). At the other end of the scale, small AC/DC power supply can use thyristors rated to 20 watts or less. Thanks to this flexibility and extent of evaluation of operational performance, the thyristor is one of the most useful current flow controllers in the arsenal of the district designer.