With bond rates at rock-bottom levels, if you want income from your portfolio, dividend stocks are hard to beat. But with the dangers that some dividend stocks present, especially those with particularly high yields, conservative investors are fearful about putting too much of their hard-earned nest eggs into the stock market.

A brand-new exchange-traded fund from Invesco's PowerShares seeks to ally investors' fears by giving them the best of both worlds: attractive dividends and low share-price volatility. Let's take a closer look at what many might see as a perfect combination in an income investment.

How the ETF works
The PowerShares S&P 500 High Dividend Portfolio is just a week old, but already, it has attracted a fair amount of attention from ETF analysts for its features. The ETF follows an index-driven investment philosophy, helping it keep fees down to a relatively low 0.30% annually. Yet the methodology behind the index is sophisticated and dynamic, so that you can expect the stocks you own to change regularly along with prevailing market conditions.

To determine which stocks it holds, the PowerShares ETF takes the 75 highest-yielding stocks within the S&P 500, with the additional restriction that no more than 10 stocks can come from any single sector. The ETF then takes those 75 stocks and picks the 50 that have had the least volatile share-price movements over the past year.

Once the ETF has made its 50 selections, it then figures out how much of each stock to buy by looking at their dividend yields. High-yielding stocks get the heaviest weights, but again, a 3% cap applies to any single stock, and no sector can account for more than a quarter of the overall fund.

The index is subject to rebalancing twice a year, at the end of January and July. As a result, some stocks may only stay within the ETF for six months if their volatility rises, and the respective weightings among stocks can respond quickly to changes in dividend payouts.

Who's in and who's out
The nice thing about ETFs is that they release their holdings on a daily basis, making it easy to see which stocks are included in any given portfolio. The bonus with the PowerShares ETF is that thanks to its methodology, you can also figure out which stocks were excluded due to high volatility.

For instance, telecom stocks have historically had some of the highest dividends in the market, because their businesses tend to throw off a lot of cash flow. Yet while four of the five high-yielding telecom stocks made it into the ETF, Frontier Communications (NASDAQ:FTR) didn't make the list.

Similarly, stocks in beaten-down subsectors failed to make the cut. Cliffs Natural Resources (NYSE:CLF) yields nearly 6%, but the stock's plunge due to falling worldwide demand for iron ore and metallurgical coal for steel production presumably boosted its volatility too high for inclusion.

Yet not every losing stock got the boot. Pitney Bowes (NYSE:PBI) has fallen 30% in the past year as investors worry about its ability to innovate beyond its historical leadership role in mail-metering devices to capitalize on the rapidly changing digital delivery and communications industry, but it earned a top 3% weighting from the ETF. Utilities also play a key role, making up almost 22% of the fund and including well-known PPL (NYSE:PPL) and Exelon (NYSE:EXC), which give investors different angles on the industry. With its specific emphasis on nuclear energy, Exelon has a much different risk profile from many more conventional utilities, and that gives dividend investors more diversification.

Try it out or wait and see?
So far, investors haven't flocked to the PowerShares ETF, with just $4 million in assets under management. But with only six trading sessions under its belt, investors may simply be waiting to see how it performs. With a solid investment philosophy and good names in its portfolio, the ETF should give dividend investors the security and income they want.

Fool contributor Dan Caplinger has no positions in the stocks mentioned above. You can follow him on Twitter @DanCaplinger. The Motley Fool has no positions in the stocks mentioned above. Motley Fool newsletter services recommend Exelon. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.