Basic isolation: Same as functional isolation but adds the shock protection.Functional isolation: Plain old electrical isolation.Here’s a quickie summary of the four basic types: It’s often dictated by the safety standards that you may have to meet, such as those of the International Electrotechnical Commission (IEC). There are several types of isolation-your application will identify the type you need. You will find a good introduction to this subject in the TI App Note “ Power Through the Isolation Barrier: The Landscape of Isolated DC/DC Bias Power Supplies. Use cases where you need to keep high-voltage (HV) circuits away from low-voltage circuits or you need to help prevent electrical shock.Where you must supply dc that has been isolated.Analog input and output modules for PLCs.Here are just a few examples of applications that typically require some form of electrical isolation: Figure 1 shows a transformer that’s fully contained within an integrated circuit along with a dc-dc converter. The good news is that for many applications, you can use an integrated-circuit transformer. For isolation involving the 60-Hz power line, your only real choice is a big, heavy transformer. Even worse is having to design that transformer yourself, if you can. The insulated windings block dc and make it possible to have separate grounds.Ī transformer isolation barrier is a good design choice, but you still must find the right transformer. With this form of energy transfer, the primary circuit is electrically isolated from the secondary circuit. Separate windings easily pass signals magnetically from primary to secondary. When it comes to designing circuits that require electrical isolation, you probably know or should know that there’s probably nothing better than a transformer to provide it. Transformers: Still the Best Way to Provide Electrical Isolation How to find the right isolation solution for your application.Designing Bipolar High Voltage SEPIC Supply for Ultrasound Smart Probe.Power Through the Isolation Barrier: The Landscape of Isolated DC/DC Bias Power Supplies.Now, you can take on those challenges easily with some interesting new dc-dc converter ICs. Two of the toughest applications for dc-dc converters involve electrical circuit isolation and high-voltage generation. The dc-dc converter has become a standard part of many designs simply because there are many different configurations that address almost any need.
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