Senin, 17 September 2018

Benefits 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.

The contactors are reliable when it comes to high current applications. Even when short circuited, they guarantee steady hard saturation which is very necessary when running high current applications such as medical test equipment. The fact that they are able to switch faster also make them efficient for use in these applications. The switching speeds generally increase the efficiency of the equipment.

These contactors can be customized in a number of ways to suit where they are being used. The customization is mostly done with the housing and the footprint. Another area that customization can be done is sensitivity. These innovations help the switches to run effectively with the equipment.

When designing the switches, one important factor considered is prevention against voltage reversal and overload. Chances of voltage reversal are very low with these switches. This prevents cases that would have been otherwise catastrophic. There are different technologies used when making the switches including MOSFET and SCR. These ensure safety and security whenever the switch is in use. Especially during switching.

Little current is required during switching which is essential in preventing heating, especially when handling high loads. This is mostly because the contactors are power controlled. Other contactors require a fair amount of current to switch. This causes a lot of heating when handling a lot of power. This may cause such switches to operate on linear mode because the level of the drain current affects the gate-source voltage. This is not the case with the power switches, level of drain current has no effect on gate-source voltage.

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.

These switches are suitable for both low-power applications and current applications. Their unique features and technology help achieve great results with very minimal risks. They are durable and can survive millions of cycles. The above features are just a few of many that make the switches suitable for day-to-day use. The technology also has a number of limitations. More developments are still being made to ensure that these limitations are dealt with to ensure efficiency in switching.




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