Question

What is a break over voltages in scr characteristics?

Answer 1

Forward Breakover Voltage

Forward break over voltage of SCR is the minimum forward voltage at which SCR starts conducting. Consider the VI characteristics of SCR in Figure 1.


SCR will not conduct up to certain value of forward voltage when it is in forward bias condition. It blocks the current up to this particular voltage. During this period the leakage current only flows through the device which is very less (negligible current). This region is called as forward blocking region. The voltage at which device starts conduction is called as forward break over voltage. In general, this voltage is in the range of 50 to 500 Volts.

If gate is supplied by a positive current then forward break over voltage occurs earlier than no gate current condition. By increasing the gate current, the forward break over voltage occurs for lower values of forward voltage

Answer 2

Answer:

Minimum forward voltage

Explanation:

The minimal forward voltage at which an SCR begins actively conducting, or turning on, is when the gate is open.

As a result, if an SCR's break over voltage is 200 V, it can block a forward voltage (i.e., the SCR stays open) so long as the supply voltage is below 200 V.

the positive anode voltage at which the gate circuit is open in a silicon controlled rectifier, causing it to enter the conductive state.

The majority of DIACs feature three layers, a break over voltage of about 30 V, and a on voltage of under 3 V.

Their behaviour is comparable to a neon lamp's striking and extinction voltages, although it is more predictable and occurs at lower voltages.

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