Regulator diode works
Also known as Zener diode or a Zener diode reverse breakdown diodes, voltage stabilizing role in the circuit. It is the use of the diode is reverse breakdown, a reverse current in a certain range does not change the characteristics of the reverse voltage over the reverse current of the regulator.
Zener diode is a special surface contact type silicon semiconductor diode, usually a silicon alloy method or a diffusion method as a semiconductor material. The voltage characteristics curve of ordinary diodes similar, but reverse breakdown curve is relatively steep.
The zener diode operates in reverse breakdown region, and after an appropriate resistance due to its complex can function in stabilizing the voltage in the circuit, so called regulator. When the reverse voltage regulator varies within a certain range, a reverse current is very small, when the reverse voltage is increased to the breakdown voltage, reverse current suddenly surge, so that the reverse breakdown voltage regulator tube, thereafter, although the current vary over a wide range, but changes in the voltage across the regulator is quite small, is conducive to this feature, the regulator access to the circuit to play a role in the regulation of.
Further, the regulator P to other diodes with different reverse breakdown is reversible, when the reverse voltage regulator is removed and returned to normal, but if the reverse current exceeds the allowable range, the zener diode will be hit completely wear and damage, so its resistance often played with a limiting role.
Zener diode used in the circuit "ZD" indicated by numbers, such as: ZD5 regulator that number is 5.
1, the zener diode regulator principle: the characteristics of the zener diode is a breakdown, the voltage across it remains substantially unchanged. Thus, when the access to the circuit after the regulator, because when the power source voltage fluctuates, causing the circuit or the voltage change at each point for other reasons, the voltage across the load will remain substantially unchanged.
2, fault characteristics: failure mainly zener diode open circuit, short circuit, and unstable voltage value. In these three failures, the former exhibits the supply voltage rises fault; fault performance of the two kinds of power source voltage is lowered to zero volts or unstable output.
