Electrical heating element, especially PTC heating element, has one heating resistance of resistance bank connected via power switch to battery voltage with pulse width modulation

摘要

The heating element (1) has a bank of resistors made up of individual heating resistors (R1,R2,Rn,Rp) that can be connected to by a control unit via switching elements (7) to battery voltage (8) according to the available generator power. One heating resistance (Rp of the electrical heating element can be connected via a power switch (9) to the battery voltage with pulse width modulation.