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Power Thick Film Resistors

A thick film resistor, power technology, applied in resistors, non-adjustable metal resistors, resistor cooling/heating/ventilation devices, etc., can solve the problem of slow heat dissipation, unstable performance and large size of power thick film resistors problems, to achieve the effect of improving the bonding effect, high resistance power and stable performance

Active Publication Date: 2016-04-06
BDS ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a power thick film resistor with small volume, large power and stable performance, so as to solve the problems of slow heat dissipation, large volume and unstable performance of existing power thick film resistors

Method used

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Experimental program
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Embodiment 1

[0014] Such as figure 1 As shown, the product uses an alumina plate or an aluminum nitride plate as the resistance substrate 6, adopts a thick film screen printing process, and screen-prints the internal electrode 5 and the resistor 4 on the upper surface of the resistor substrate 6, and the surface of the resistor 4 is printed with a glaze The protective layer 3, the back electrode 7 is printed on the lower surface of the resistance substrate 6, and the internal electrode 5 is connected to the external terminal 1 through the lead wire 2. The surface of the resistance substrate back electrode 7 is welded and fixed with a heat conduction plate, and the heat conduction plate includes a porcelain substrate 10 (aluminum oxide plate or aluminum nitride plate), the inner and outer surfaces of the porcelain substrate 10 are respectively welded with the inner heat conduction sheet 9 and the outer heat conduction sheet 11, the surface of the inner heat conduction sheet 9 is plated with ...

Embodiment 2

[0016] Such as figure 2 As shown, including the entire structure of Embodiment 1, in order to further increase the heat conduction speed, a layer of heat conducting sheet 13 is added between the back electrode 7 of the resistance substrate and the nickel layer 8 of the heat conducting plate, and the heat conducting sheet 13 is made of copper.

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Abstract

The invention discloses a power thick-film resistor which comprises a resistor substrate provided with a printed internal electrode and a resistor both on one surface as well as a printed back electrode on the other surface, wherein a heat-conducting plate is arranged on the surface of the back electrode of the resistor substrate in a matching manner, and is a porcelain substrate of which the inner surface and the outer surface are fixedly coated with an inner heat-conducting fin and an outer heat-conducting fin respectively; the surface of the inner heat-conducting fin is plated with a nickel layer; the nickel layer is oppositely welded and fixed with the back electrode on the resistor substrate in a matching manner. The porcelain substrate of which the inner surface and the outer surface are coated with the inner heat-conducting fin and the outer heat-conducting fin in a welding manner is welded on the surface of the back electrode of the resistor substrate to serve as the heat-conducting plate, and the heat-conducting fins on the two surfaces cancel out each other due to temperature distortion so as to enable the thermal expansion coefficient of the heat-conducting plate to be basically the same as that of the resistor substrate, so that the problem that the resistor substrate cracks due to the inconsistent thermal expansion coefficient during the use of the resistor substrate in a large size resistor is solved; the power thick-film resistor has the advantages that under the condition of the same size, the resistor is larger in power compared with a conventional resistor, the stable performance is realized, and the temperature distortion cannot be caused.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to a power thick film resistor. Background technique [0002] Power thick film resistors are mainly used in some specific environments and specific equipment. In order to increase the power during use, they need to be installed on the radiator, and the heat generated by the resistor will be dissipated quickly through the radiator. Therefore, the speed of heat dissipation of the resistor is determined. The size of the resistance power. Transfer the heat of the resistor to the radiator quickly, reduce the temperature rise of the resistor, and improve the power and life of the resistor. The existing power thick film resistors mainly have the following two structures: [0003] 1. In traditional thick film resistors, the porcelain substrate is directly installed on the heat sink through thermal conductive silicone grease. Because the thermal conductivity of the porcelain substrate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/00H01C1/08
Inventor 李福喜李开锋崔艳红郑如涛唐忠纪
Owner BDS ELECTRONICS
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