Heating system having at least one electrothermal heating layer, a structural component having such a heating layer, a heating method and a method for producing a semi-finished component or a component having a heating device

1. A structural component comprising a heating system with at least one energy supply device, wherein the heating system comprises:

a base heating device comprising an insulation layer, with an electrothermal base heating layer arranged thereon which comprises at least one bundle of rovings, or at least one compound structure of rovings, or at least one ribbon of rovings, and with an electrical connecting device connecting at least one energy supply device to the base heating layer, wherein the ends of each roving in each case are connected to an electrode of the electrical connecting device,

an additional heating device comprising an insulation layer with an electrothermal additional heating layer arranged thereon which comprises at least one bundle of rovings, or at least one compound structure of rovings, or at least one ribbon of rovings, and with an electrical connecting device connecting the energy supply device to the additional heating layer thereby providing a cohesive heating effect, the base heating device and the additional heating device are spatially associated with each other, and in this arrangement the energy supply device is designed in such a manner that in an activation phase current is supplied during at least a partial period of time to the additional heating layer to heat the structural component in the region of the additional heating layer to a setpoint temperature, and that, above and beyond the activation phase, current is continuously supplied to the base heating layer so that the base heating layer generates heat continuously during operation of the heating system, while the additional heating layer generates heat in the partial period of time.

2. The structural component according to claim 1 , wherein the energy supply device supplies current to the additional heating layer at a first period of time in the heating phase at an intensity 50% higher than that of the current supplied to the base heating layer, and wherein during later periods of time in the heating phase, which follow the first period of time, current is supplied to the additional heating layer at an intensity 50% lower than that of the current supplied to the base heating layer.

3. The structural component according to claim 1 , wherein the heating system comprises: a further additional heating device comprising an insulation layer with a further electrothermal additional heating layer arranged thereon, and comprising an electrical connecting device, by way of which the energy supply device is connected to the further additional heating layer,

wherein the function of the energy supply device for controlling the current in the heating layers is designed in such a manner that, in relation to the current which in each case flows in the additional heating layers, in each additional heating layer first and second periods of time with different current intensities of the heating current form, which periods of time alternate,

wherein the current intensities in the respective first heating phases are significantly higher than the current intensities in the respective second heating phases.

4. The structural component according to claim 3 , wherein the first electrothermal additional heating layer and the further electrothermal additional heating layer in relation to the sheet-like extension of the base heating layer are arranged within said base heating layer.

5. The structural component according to claim 1 , wherein the electrothermal additional heating layers comprise at least one ribbon of rovings which are connected by way of the electrical connecting devices to the energy supply device, which rovings comprise carbon conductors, wherein the at least one ribbon of rovings is arranged in such a manner that it is distributed in a sheet-like manner over the additional heating layers.

6. The structural component according to claim 1 , wherein the electrothermal base heating layer comprises at least one ribbon of rovings which is connected by way of the electrical connecting devices to the energy supply device, which rovings comprise carbon conductors, wherein the at least one ribbon of rovings is arranged in such a manner that it is distributed in a sheet-like manner over the base heating layer.

7. The structural component according to claim 5 , wherein the roving comprises carbon filaments that extend in the rovings parallel to each other and at least in some sections in longitudinal direction of the rovings.

8. The structural component according to claim 5 , wherein the at least one electrothermal additional heating layer comprises at least one ribbon of rovings, which ribbon is connected to the energy supply device by way of the electrical connecting devices, and extends in a meandering manner within the respective heating layer.

9. The structural component according to claim 5 , wherein the heating region of the first and/or of the second internal heating device, when viewed in the direction of thickness of the respective heating region, comprises a layer of at least one ribbon of rovings.

10. The structural component according to claim 1 , wherein the electrothermal layer comprises metallic conductors.