Electric heating for motor vehicles
First Claim
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1. An electric heating device, usable as a supplemental heater for a motor vehicles, comprising:
- a heater block including a plurality of heating elements, and a control unit for controlling the heating elements, wherein the control unit forms one structural unit with the heater block and has power transistors arranged on a printed circuit board and cooling elements allocated to these power transistors, wherein each cooling element is connected through an opening in the printed circuit board to the respective power transistor, wherein each cooling element is formed from a cooling body and a heat-conducting element insertable into the opening of the printed circuit board, and wherein each heat-conducting element of each cooling element is mechanically fixed in the opening.
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Abstract
An electric heating device as supplemental heating for motor vehicles includes as the heating elements power transistors directly mounted on the printed circuit board. For efficient removal of the dissipation heat from the power transistors the latter are in direct contact on their underside with a cooling element via openings in the printed circuit board. In order to simplify manufacture, the cooling elements are formed in two pieces: the heat conducting disk with a small thermal mass insertable into the opening of the printed circuit board, and the cooling body which can be connected to that heat-conducting element.
32 Citations
29 Claims
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1. An electric heating device, usable as a supplemental heater for a motor vehicles, comprising:
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a heater block including a plurality of heating elements, and a control unit for controlling the heating elements, wherein the control unit forms one structural unit with the heater block and has power transistors arranged on a printed circuit board and cooling elements allocated to these power transistors, wherein each cooling element is connected through an opening in the printed circuit board to the respective power transistor, wherein each cooling element is formed from a cooling body and a heat-conducting element insertable into the opening of the printed circuit board, and wherein each heat-conducting element of each cooling element is mechanically fixed in the opening. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An electric heating device, usable as a supplemental heater for a motor vehicle, each comprising:
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a heater block, and a control unit for controlling the heating elements, wherein the control unit forms one structural unit with the heater block and has power transistors arranged on a printed circuit board and cooling elements allocated to these power transistors, wherein each cooling element is connected through an opening in the printed circuit board to the respective power transistor, wherein each cooling element is formed from a cooling body and a heat-conducting element insertable into the opening of the printed circuit board, wherein each heat-conducting element, as the distance from the power transistor increases, has a larger cross-section area, wherein each heat-conducting element is at least essentially cylindrical, wherein the section of each heat-conducting element arranged in the opening of the printed circuit board has an at least essentially conical shape growing smaller in the direction of the end in contact with the power transistor, and wherein the section of each heat-conducting element that is arranged in the opening of the printed circuit board has radial projections for mechanical fastening the heat-conducting element in the opening of the printed circuit board.
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22. An electric heating device comprising:
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a heater block having a plurality of heating elements, and a control unit that forms a single structural unit with the heater block and that controls the heating elements, the control unit including a plurality of power transistors arranged on a printed circuit board and a plurality of cooling elements, each of which is allocated to a respective one of the power transistors, wherein each of the cooling elements is connected through an opening in the printed circuit board to the associated power transistor, and wherein each of the cooling elements is formed from a cooling body and a heat-conducting element inserted into the opening of the printed circuit board, and wherein the heat-conducting element is fixed in the opening in the printed circuit board. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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Specification