ELEKTRISCHE HEIZVORRICHTUNG, INSBESONDERE FÜR DEN EINSATZ IN KRAFTFAHRZEUGEN

摘要

The heater has heating elements (2) in a block in a rectangular frame (3-5) and a controller forming a unit with the block. The heating power of the heating elements can be adjusted via the current flowing through them and the controller contains power transistors for setting the current. The controller pulse width modulates the current flowing through the heating elements; only one heating element at a time can be driven by a current rise or fall.