Abstract: An electric heating system for motor vehicles including one or several electric heating elements; a control circuit provided for controlling the power dissipated by the heating elements; the control circuit including one or several power semiconductors arranged on a circuit board; the circuit board is by means of a solid matter connection connected by the side facing away from the power semiconductors to a metal plate intended to be mass potential; the metal plate being electrically insulated from conductor paths located on the underside of the circuit board and intended to carry a voltage in relation to the ground potential; the control circuit being arranged in a housing. One or several heat sinks are provided outside the housing. The metal plate is connected with the heat sinks arranged outside the housing by thermally conductive connectors.

Abstract: An electrical air heating apparatus, especially for a motor vehicle, with electrical heating elements (3) for heating air and a housing (1) which has a ground connection (1a), an electrical supply connection and an electronic circuit (7) to control the supplying of electrical power to the heating elements (3). In the housing (1), the heating elements (3) are arranged in electrical contact with the ground connection and the electrical supply connection. The housing (1) is made of an electrically conducting material, for example, aluminum and is constructed in one piece with a molded-on ground connection (1a). The heating elements (3) and the electronic circuit (7) are arranged in direct electrical contact with the housing (1).

Abstract: The invention describes an electric heating system for motor vehicles with the following characteristics:

Abstract: An electrical air heating apparatus, especially for a motor vehicle, with electrical heating elements (3) for heating air and a housing (1) which has a ground connection (1a), an electrical supply connection and an electronic circuit (7) to control the supplying of electrical power to the heating elements (3). In the housing (1), the heating elements (3) are arranged in electrical contact with the ground connection and the electrical supply connection. The housing (1) is made of an electrically conducting material, for example, aluminum and is constructed in one piece with a molded-on ground connection (1a). The heating elements (3) and the electronic circuit (7) are arranged in direct electrical contact with the housing (1).