Problem P. 4549. (May 2013)

P. 4549. A thyristor is an electrical element made of semiconductor, and can be used in many different ways. Its current-voltage characteristics is quite strange. (See figure 1.)

The thyristor is connected as shown in figure 2, and the voltage U₀ is slowly increased from zero to U_max, and then it is slowly decreased back to zero.

Graph the current as a function of the voltage U₀, if

a) $R=2\frac{U_1}{I_1}$ and $U_{\max}=7\,U_1$ ,

b) $R=20\frac{U_1}{I_1}$ and $U_{\max}=30\,U_1$ .

(5 pont)

Deadline expired on June 10, 2013.

Sorry, the solution is available only in Hungarian. Google translation

Megoldásvázlat.

A tirisztor $\displaystyle U(I)$ nemlineáris karakterisztikájának és az $\displaystyle U(I)=U_0-IR$ egyenesnek (ún. munkaegyenesnek) a metszéspontja adja meg a keresett $\displaystyle I(U_0)$ kapcsolatot. (Több metszéspont esetén a meredekségek nagysága választja ki a stabil állapotot.)

Statistics:

12 students sent a solution.

5 points: Asztalos Bogdán, Olosz Balázs, Papp Roland.

4 points: Beregi Ábel, Szilágyi András.

3 points: 3 students.

2 points: 2 students.

0 point: 2 students.

Problems in Physics of KöMaL, May 2013

12 students sent a solution.
5 points:	Asztalos Bogdán, Olosz Balázs, Papp Roland.
4 points:	Beregi Ábel, Szilágyi András.
3 points:	3 students.
2 points:	2 students.
0 point:	2 students.

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