Temperature control device and method for heating work rolls

A temperature control device (10, 16, 26, 38, 43) for inductively heating work rolls for rolling tape- or plate-shaped rolling stock (36), tapes, films, metal films, or metal films made of aluminum, the temperature control device comprising at least one temperature control unit (11, 17, 27, 37, 44) having at least one induction coil (15, 19, 28) which is assigned to a working roll (23, 30, 34), wherein the induction coil is disposed in or on a casing (20, 29, 41, 47) of the temperature control unit, the temperature control device comprising a transformer (12, 18), the transformer being designed to transform an input voltage into a lower output voltage of the transformer, to which the induction coil is connected, the transformer being disposed adjacent to the induction coil, the transformer being integrated directly in the casing or disposed directly on the casing.