Place the carrots, onion, celery, garlic, thyme and 2 cups of the broth in a 6 quart stockpot. Heat to a boil; reduce heat to low; cover and cook for 10 minutes or until the onion is tender.
Add the remaining broth, zucchini, tomatoes, tortellini and beans. Heat to a boil; reduce heat to low; cover and cook for 15 minutes or until the tortellini is tender. Serve with grated Parmesan cheese if desired.