ZENER Diode - 7 |
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COOLING
OF THE ZENER
The
current that crosses a diode valve zener, used like stabilizing
element of voltage of a load to variable absorption, is inversely proportional
them to that one of the same load. That is, to a current
increase, through the device, lessening of this in the
zener corresponds one. And it can also be said that, the more current
absorbs the load, less passes some through the diode valve zener.
Saying this, is easy to comprise as the diode valve zener dissipates one
always greater amount of energy, in practical of power electrical
worker, to diminishing of the current distributed from the circuit in
escape. But the zener it dissipates greater power also when the voltage to stabilize increases of value and
vice versa. First of the two exposed concepts hour can easy be ascertained eliminating the load in a whichever stabilizing circuit, in order to control like the zener is heated beyond measure. Obviously, this is one condition electrical worker limit, to realize for short time and single reasons of curiosity. According to concept, instead, it can easy be transferred in practical, elevating the voltage of feeding of the circuit of figure 5, from the value of 9 Vcc to that one of 18 Vcc and putting the cursor of potentiometer the R2 on the concurred maximum resistive value. One will notice to us endured that the zener it will catch up one elevated temperature, such to demand the use of a good dissipater of heat to apply to the diode valve in the way indicated in figure 13. The two elements are of brass, electrically it separates to you between they and everyone of these knits to you to pond on the external terminal of the component.
Fig. 13 - In order to cool a diode valve zener, it convene to sold to pond, on its finishes them, two electrically isolated brass fins between they.
VALUES
TRADE THEM OF THE VOLTAGES OF DIODE ZENER
0,78
2,4 2,7 3 3,3 3,6 3,9 4,3 4,7 5.1 5,6 6,2 6,8 7,5 8,2 9.1 10 11 12 13 15
16 18 20 22 24 27 30 33 36 39 43 47 51 56 62 68 75 82 91 100 110 120 130
150 160 180 200
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