| 摘要 |
<p>An electrical heating element (40, 42) includes a central non-conductive core (44), a resistance (46) helically wrapped around the core (44), a PTC polymer (48) surrounding the resistance (46), an electrically conductive foil (52, 54) wrapped over the polymer (48) and enclosing any electromagnetic fields, and an insulative jacket (58) around the exterior of the cable (40, 42). A return wire (50, 56) may be helically wrapped over or under the foil (52, 54). The heating element (40, 42) is suitable for use in an electric blanket and may have AC power connected to each conductor at the front end of the cable.</p> |
