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You can buy an AC power adaptor for the 450D, as you can for any DSLR.
I stripped the guts out of a battery and wired DC to it from a DC adaptor, but if you do it yourself you need to know exactly what to do. The one I built worked fine on a 300D, but not with a 40D (same battery and voltage). DSLRs now it seems test the battery in ways that make it hard to simulate with an external DC supply (internal impeadance, capacity etc). I then bought the Canon real deal and it works fine.
IMO its not worth the bother/risk to go cheap and try and make your own, just get a Canon AC adaptor for the 450D, I dont know the part no, but its not hard to find.
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