I am trying to give myself a physical explanation of the dynamic resistance in zener diodes. This is what I made up:
We know that zener's dynamic resistance Zzt is verry large for small currents and small for high currents. So here, starting forth to back, I speculate. When will the current be low? --> when the input voltage is small. When will the current be high? --> when the input voltage is high. And from here I get, that as soon as you apply Vtreshold the zener breakdown occurs and minimal zener voltage flows. At that point the resistance is pretty big (500ohms in some diodes). As you increase the input voltage, you turn it on even harder, the resistance decreases and the current goes up. And so at Izt, Zzt will be verry small. And from here it becomes clear to me why there is much bigger change in Vz at lower currents than at the test current.
Is that right?
We know that zener's dynamic resistance Zzt is verry large for small currents and small for high currents. So here, starting forth to back, I speculate. When will the current be low? --> when the input voltage is small. When will the current be high? --> when the input voltage is high. And from here I get, that as soon as you apply Vtreshold the zener breakdown occurs and minimal zener voltage flows. At that point the resistance is pretty big (500ohms in some diodes). As you increase the input voltage, you turn it on even harder, the resistance decreases and the current goes up. And so at Izt, Zzt will be verry small. And from here it becomes clear to me why there is much bigger change in Vz at lower currents than at the test current.
Is that right?