TVS diode function

TVS diode is a type of transient suppression diode can be used in electric meter equipment. Its main function is to protect the electric meter and its related circuits from damage by transient voltages (such as lightning strikes, power grid spikes, electromagnetic interference, etc.) . A transient voltage suppression diode can quickly conduct when a transient over voltage occurs and shunt the current to protect circuit components from high voltage shocks.

Topdiode TVS diodes has been supplying to State Grid and China southern power Grid over 10 years, can PIN to PIN replaces ON Semi, Vishay, Littelfuse etc.

TVS diode Commonly used series are as follows

Electric meter TVS tubes are usually used in the following scenarios:

Power supply protection: When the meter is connected to the power grid, transient high voltage pulses may appear on the power line. The TVS diode can respond quickly when the voltage exceeds the rated value to protect the power circuit.

Communication interface protection: Many smart meters have remote communication functions, such as RS-485, MODBUS or other communication interfaces. These interfaces are susceptible to transient voltage interference. TVS diode can effectively prevent over voltage from damaging the communication module.

Lightning protection: In lightning weather, the instrument and the circuit it is connected to are easily affected by induced lightning. As a circuit protection device, TVS diode can absorb and guide transient lightning current to prevent instrument damage.

How to select TVS diodes

When choosing a suitable TVS diode for electric meter, you generally need to consider the following points:

• Reverse operating voltage (VRWM): must be higher than the normal operating voltage of the meter circuit.
• Clamping voltage (VC): When over voltage occurs, the TVS diode clamps the voltage to a safe value to ensure that the components of the circuit will not be damaged by excessive voltage.
• Peak pulse current (IPP): Indicates the maximum value of the transient impulse current that the TVS diode can withstand. It is usually selected based on the transient current that the meter may suffer.

 In the specific application of electric meters, Topdiode’s TVS diode are selected from models suitable for industrial applications, which have a long life and strong ability to withstand transient over voltage. It is one of the first choices for alternative material solutions.

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