How can I go about obfuscating the design of my circuits and embedded controls?
A power converter does not sound like there is much to protect. Frankly, code protection (while I would not suggest leaving it out) is not much of a disincentive to copy. It can be reverse engineered or (more likely) broken quite cheaply by technical means (don't ask). You could consider embedding an "Easter Egg" that would give you an easy indication of copyright infringement as opposed to reverse engineering. 

The other things you suggest may slow down someone a bit, but once the decision to clone has been made, I don't think you'll get very much relief from that. As Olin says, most things you can do increase your cost without increasing value to your end user, and give the cloner another advantage. If the product is at all successful, there will be imitators. Even if it isn't there might be. 

Frankly, I think your best bet is to use non-engineering methods such as IP protection. Some of the folks I have worked with (PRD area) have recently had decent results in stopping cloning of their products using legal technology. It may help that they employ reasonable numbers of locals in their factories (low thousands). While the remedies are not large amounts of money by Western standards, I know of cases where equipment and product has been seized. You do have to file the appropriate patents and engage a local legal firm (and possibly private investigators) to get this to happen. On the plus side, a legal "dream team" is not impossibly expensive. You may also be able to stop entry of infringing products at your borders, depending on the country, type of protection, etc. 

I remember a poor Belgian fellow freaking out at a trade show because his Chinese contract manufacturer was displaying "his" proprietary SMPS design for sale to any takers (okay, they said it was "a bit different"). I was similarly upset when my really special design (sort of a Kelvin-Varley thing they thought was impossible to make, but I showed them how) showed up in a printed catalog from the component manufacturer. Fortunately, they had no clue whatsoever as to the application, so I doubt it caused much harm. Things are ummm different there.