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Things You Should Know A High Voltage Contactor

By Robert Hughes


Developments in semiconductor technology have led to the innovation of solid state switches that can replace thyratrons, ignition and spark gaps that were being used before. Older electronics used drivers that are being replaced by TTL input. These advances have improved the efficiency of switches over time. A high voltage contactor has the flow features that make them one of the best inventions.

One of these details is the low input power loss. This low loss has been making possible through the use of MOSFET technology when developing the switches. The only loss incurred in this technology is only caused by the total gate charge, the drive voltage, and switching frequency. The loss is very low since the overal gate charge is small. Switches that use bipolar transistors such as BJT tend to cause more losses. There is a lot of power lost especially during switching.

These are the most reliable and efficient switches when it comes to current equipment. Most of this equipment requires a steady saturation even when short circuited. In switch mode supplies, these contactors use smaller inductors because switching is done at fast speeds. This greatly improves the overall efficiency of the contactors. The reliability they offer has made them the best choice for high current equipment such as medical test equipment.

Switches are easily customized especially when it comes to the housing and footprint. This helps them suit and fit where they are meant to be used. Besides the customization, these contactors are quite easy to use due to the incorporation of galvanic isolation with TTL control. The sensitivity of the switches is also customized in different ways to suit the specified use.

The switches have been designed to prevent cases of overload or voltage reversal. Voltage reversals have been causing adverse effects which makes them safe for use anywhere. The technologies used in these contactors reduce risks that come with handling the current.

These contactors are voltage controlled unlike those controlled by current. This helps them to switch using very little current which means they can handle high loads without heating. On the other hand, other switches require a fair amount of current to switch which makes them create a lot of heat when handling high loads. The possibility of these switches operating in linear mode is very minimal. This is because the level of drain current does affect the gate-source voltage.

Faster switching is guaranteed with these switches. This is because they are able to handle high frequencies. The switching losses are incredibly low compared to other switches. The gate of transistors used in these contactors is insulated with a thin oxide layer which means they do not need to draw current when switching. This has an advantage in speed and the time taken to switch.

These power contactors are effectively used with both high and low power equipment. The few discussed features have been the reasons why they have become common. The factors mentioned above are very important and make considerable impacts on the performance of any equipment.




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