How does Zener diode work in tracker device ? Hardware workshop from Aovx engineers
20 January,2022
By Aovxers
AOVX hardware workshop

First of all, it should be noted that the Zener tube is a diode, and can also be used as an ordinary diode if the cost is not considered.



In the Aovx vehicle tracker device , we also use the zener diodes widely


A vehicle tracker solution could help you lower the risks of car rental and promote the effectiveness of fleet management.


For example , a fleet tracking GPS has a hardware element — like vehicle trackers — and a software component. This fleet tracking system enables drivers to keep their records updated.

Similarly, it also provides an easy way for fleet managers to see at a glance how well their fleet performs.

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Features :

Motion Detect

Vibration Alert

Electronic Fence

Tamper Alert

Low Battery Alert

ACC ON OFF Detection






Cat.M1 / NB-IoT With 2G Fallback

Multiple GPIOs

RS232/485 Interface

Working With BLE Sensors


When the power supply is reversely applied to the Zener tube through the current limiting resistor to reach the breakdown voltage, the reverse current will rise rapidly. In this way, within a certain power range (0.25W~50W), both ends of the voltage regulator tube almost keep the voltage regulation voltage unchanged, showing the voltage regulation characteristics.



In other words, if you want to use a Zener tube to work normally in a regulated state, the reverse current needs to be between the minimum current to maintain the stable voltage Vz and the maximum allowable current of the Zener tube.

Generally, in the design of the standard voltage regulator structure connected in series with the resistor, the power consumption of the resistor will be considered, which is basically calculated according to the minimum current. Many of them are 2mA~5mA, and some are up to 20mA.

For example, in the design of the standard voltage regulator structure in which the resistors are connected in series in Figure 12-1, the value of the series resistor R is the key. According to the relationship in the figure, we know that this resistance R directly affects the formation of the regulated current Iz of the zener tube, and the size of the load current Io that can be provided under voltage regulation.



Figure 12-1





In addition, through the volt-ampere curve of the diode in Figure 11-3, we can see that within the range of power conditions, the larger the reverse current, the better the voltage regulation effect. It is not difficult to understand that the larger the reverse current is, the closer it is to the far left of the curve, the steeper the slope, and the smaller the voltage swing corresponding to the abscissa, the more stable the voltage.


The Zener tube also has a dynamic resistance: r (D) , which is the ratio of the voltage change at both ends of the Zener tube to the current change, that is, this value changes with the working current. Usually, the larger the working current, the smaller the dynamic resistance, and the better the voltage regulation performance. When the reverse current of the zener tube changes with , the dynamic resistance will produce a change in the value of the voltage regulator.


Zener diodes are diodes, so they are also affected by temperature. In order to compensate the voltage temperature coefficient of the Zener diodes, the Zener diodes can be used in series with silicon diodes (including silicon Zener diodes), as shown in Figure 12- 2 shown. When the temperature rises, the forward voltage Vd of the diode will change in the opposite direction to the voltage regulator Vz of the Zener tube, thereby compensating the Zener tube and stabilizing the voltage of Vz+Vd.


Figure 12-2



Finally, add the main selection parameters of the Zener tube:

Stable voltage Vz: the reverse breakdown voltage of the Zener tube when it is working normally.

Stable current Iz: the reference current when the Zener tube works at a stable voltage.

Maximum stable current Izm: The maximum stable current of the regulated current when the Zener tube works in reverse.

Maximum allowable power dissipation Pzm: The maximum power when the junction temperature of the PN junction of the Zener tube is too high and not damaged.






 Figure 12-3


Learn more about AOVX :

The wireless sensor monitoring technology developed by the AOVX  creatively integrates the three elements of “people”, “goods” and “warehouses” in the logistics supply chain into one platform, and conducts all-around data collection and analysis for personnel, goods, and the environment in warehousing and logistics monitor.




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