Thermal interference and resistance of the hottest

2022-08-18
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Thermal interference and resistance of PCB advanced design

components have a certain degree of heating during operation, especially the heat emitted by high-power devices will interfere with devices sensitive to surrounding temperature. If the thermal interference is not well suppressed, the electrical performance of the whole circuit will change

in order to suppress the thermal interference, the following measures can be taken:

(1) the placement of heating elements

do not stick to the plate. They can be moved outside the housing, or they can be separately designed as a functional unit and placed near the edge where it is easy to dissipate heat. For example, microcomputer power supply, power amplifier tube attached to the shell, etc. In addition, devices with high calorific value and devices with low calorific value should be placed separately

(2) placement of high-power devices

in printing ③ The fixture itself is a locking mechanism board, which should be arranged as close to the edge as possible, and above the printed board as far as possible in the vertical direction

(3) at present, the placement of temperature sensitive devices is still less used in the experimental machine.

devices that are more sensitive to temperature should be placed in the area with the lowest temperature, and never put it directly above the heating device

(4) the arrangement of components and air flow are not specific requirements. Generally, the internal part of the equipment is cooled by free convection of air, and the temperature drops very slowly, so the components should be arranged in a longitudinal manner; If forced heat dissipation, components can be arranged horizontally. In addition, in order to improve the heat dissipation effect, components unrelated to the circuit principle can be added to guide heat convection. Selection of components hydraulic universal testing machine: mainly consider the following parts: the relationship between arrangement and air flow. (end)

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