The basic principle of static switch

Published:2011/4/7 22:10:00 Author:may | Keyword: static switch | From:SeekIC

The usage of static switch: it can parallel normal work only when two AC power supply has the same frequency, amplitude. When one AC power supply go wrong, will generate restoring current between the two power supply, thereby make changes of output voltage in two parallel power supply, it will influence the reliable of power supply. The usage of static switch is cut the error power supply to output, and accomplish unbroken switchover between inverter output and commercial power bypass output. We mostly adopts high-speed relay as switching device, because its switching time only has 2ms~5ms, is fit for the requirement of communication equipment needing power supply without interruption. In the case of UPS power supply with capacity above 2KVA, because the increase of relay working current, its switching time will add to 80ms~120ms, and sparkle generated in the moment relay snapping will cause high temperature to damage the contact point, or voltaic arc generated between normal open and normal close contact point will short circuit the two AC power supply in a moment, so relay using for switching is only limit to low capacity UPS power supply, but its switching time has tens seconds.



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