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05-03-2017 07:52 AM - edited 08-01-2017 04:01 PM
In the world of industrial design, there are a few critical parametersthat cannot be compromised. First and foremost is safety; thegoal is to achieve high levels of intrinsic safety without sacrificing system performance. Second, industrial environmentsare inherently noisy. Products introduced to thesetypes of industrialsettingsshould be highly immune to external noise fields andhigh voltage noise transients.
Most industrial systems are large infrastructure-type projects, which usually translates tohigh cost. The large investment means theyneed to be long-lasting to justify the expense. This financial commitment makes it necessary fortheproducts to be resilientanddurableunder high stress conditions.
Finally, these systemstend to be high performance –whether that’smeasured in terms of throughput or efficiency. Therefore, the products should have excellent performance characteristics,such as low propagation delays and low skews, and a high level of part-to-part compatibilityto ensurethat theproductperformanceis stable and repeatable.
Using isolation products when designing industrial systems can provide all of these benefits,in particularthe safety and noise immunity characteristics, whichare the most desiredin this sector
The Importance of Isolation
Isolation is required when circuits within a system that are not referenced to a common ground have to transfer data or control signals to each other.In some cases, the difference in common mode between the systems may varygreatly–even thousands of volts. This is fairly common with high-power systems such as motor control or high wattage power supplies or UPS systems.Here, safety is a primary concern-the high voltage can be a safety hazard for human operators as well as low-voltage electronic circuits.
Another important use of isolation products is for noise elimination. Since isolation products effectively cut the ground loop between two circuits while transferring data, this helps to eliminate ground loop currents and therefore noise issues.Level shifting is also a common use for isolation products, which are intrinsic level shifters.