Abstract: Described is a heating plate having a substrate made of metal, a heating layer and an insulation layer which is arranged between the heating layer and the substrate. It is provided according to this disclosure that the insulation layer bears an electrically conductive shielding layer and that the shielding layer is covered by a second insulation layer on which the heating layer lies. In addition, a flow heater having such a heating plate is disclosed.

Abstract: Described is a supply circuit for a corona ignition device, with an input for connection to a direct voltage source, a first converter, a second converter, and an output for connecting a load. The two converters each generate an output voltage, which is provided on its secondary side and exceeds the input voltage. The two converters each contain a transformer that galvanically separates the primary side of the converter from its secondary side. At least one transistor switch is arranged between the input and primary side of the two converters for pulse width-modulation of the input voltage.

Abstract: Described is a supply circuit for a corona ignition device, with an input for connection to a direct voltage source, a first converter, a second converter, and an output for connecting a load. The two converters each generate an output voltage, which is provided on its secondary side and exceeds the input voltage. The two converters each contain a transformer that galvanically separates the primary side of the converter from its secondary side. At least one transistor switch is arranged between the input and primary side of the two converters for pulse width-modulation of the input voltage.

Abstract: The invention describes a heating apparatus comprising at least one heater (9) in which one or more electric heating elements (11) are arranged, and at least one heat transmitter (1), which is connected with the at least one heater (9), comprises heat transmitter surfaces and is formed from an extruded profile (1a, 28, 28a) in which the at least one heater (9) is fitted, in which at least part of the walls (6, 22, 22a) of the extruded profile (1a), which are not in contact with a heating element (11), is provided with openings through which a gaseous or liquid medium can flow through the extruded profile (1a, 28, 28a) in transverse direction to the direction of extrusion (17).

Abstract: The invention relates to a heating device comprising at least one tube housing in which at least one PTC heating element is arranged, and heat exchangers which are secured on the tube housing. According to the invention, it is provided that the heat exchangers are secured on the tube housing by stamping.

Abstract: The invention relates to a heating device comprising at least one tube housing in which at least one PTC heating element is arranged, and heat exchangers which are secured on the tube housing. According to the invention, it is provided that the heat exchangers are secured on the tube housing by stamping.

Abstract: The invention relates to an electric heater for a motor vehicle, the heater includes at least one branch circuit in which a field effect transistor is connected in series to the resistor, and a control circuit for regulating power, wherein the control circuit taps a voltage signal between the field effect transistor and the resistor and, on the basis thereof and in combination with a setpoint value signal, generates an output signal which is present at a control input of the field effect transistor. According to the invention, the resistor is a ceramic PTC resistor which is mounted with the field effect transistor on a common heat sink.

Abstract: The invention relates to a heater comprising at least one electric heating element and at least one heat-dissipating panel that has holes through which a fluid to be heated can flow, The heat-dissipating panel is heat conductively connected at the at least one heating element and is provided with a front side facing the heating element and a rear side. In an area lying across from the heating element, the heat-dissipating panel has a cross-section that is open towards the heating element.

Abstract: The invention relates to an apparatus for heating fluids, comprising a housing in which a duct runs, through which the fluid to be heated can flow and which leads from a housing opening for fluid to enter to a housing opening for fluid to exit. According to the invention, the duct extends in several convolutions along a housing wall carrying at least one heater housing, in which at least one electric heating element is arranged.

Abstract: A method for operating a device in which typically a very high current is generated when the device is turned on compared to the rated current, e.g. an analogue operated PTC heating device for a mobile device, such as a vehicle, is disclosed. In this method, the power on the device is increased in a defined limited manner or in a ramp-like manner in the connection phase to avoid a high current when the device is switched on.

Abstract: The invention describes a heating apparatus comprising at least one heater (9) in which one or more electric heating elements (11) are arranged, and at least one heat transmitter (1), which is connected with the at least one heater (9), comprises heat transmitter surfaces and is formed from an extruded profile (1a, 28, 28a) in which the at least one heater (9) is fitted, in which at least part of the walls (6, 22, 22a) of the extruded profile (1a), which are not in contact with a heating element (11), is provided with openings through which a gaseous or liquid medium can flow through the extruded profile (1a, 28, 28a) in transverse direction to the direction of extrusion (17).