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Important Features Of 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.

They are reliable for current applications. They offer steady hard saturation even at short-circuit operation. The ability to switch faster enabling them to use smaller inductors in switch mode supplies. This increases overall efficiency. This reliability makes it possible to use these contactors in 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 switches are able to handle high loads without heating. Heating has been the main concern with fuses. They are voltage controlled and do not use a lot of currents. Other models require more current to switch which leads to increases in heating especially when handling high loads. Now, the drain current does not affect the voltage at the source gate. This ensures that switches never operate linearly.

These type of switches ensures that there is a faster switching. This is made possible because the switches are able to handle high frequencies. The faster switching also does not leave a chance for much loss. The transistors are insulated with a thin oxide layer which prevents drawing of current during switching. This advantage has a lot of effect on the overall performance of the contactors and the power losses.

There are many developments still being made in the semiconductor technology in order to reduce limitations if these contactors. They are efficient enough to be used in day-to-day operations but still have a few downsides that need to be taken care of. The above-discussed features are just some of the advantages of using these switches. These are sure to make your work easy.




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