When wood chips are used as mulch in a garden, and especially if they're tilled into the soil as an amendment, they don't break down quickly.
Because they break down so slowly, wood chips may rob your soil of nitrogen. They also tend to draw lots of unwanted pests that are looking for a home.
Wood chips are great for many other things from moderate use in compost piles to creating natural walkways. However, I don't recommend adding them as an amendment when cultivating your garden soil.
If your chipper shredder has left you with excess wood chips, don't add them into places where they're not needed. Check with your neighbors to see if they'd like some, or contact nearby friends and relatives.