How does a high-power resistor dissipate heat
Our common high-power resistors include high-voltage resistors, ceramic pipeline wound resistors, aluminum shell wound resistors, planar non inductive film resistors, etc.
Generally, ceramic pipeline wound resistors and high-voltage resistors use air cooleing , so the nominal power is not very large. The high voltage resistor can be directly used in oil, so its performance will be enhanced. Some high-voltage resistors can be cooled and dissipated by water. The circulating water passes through the pipeline or is directly placed in the water for use, so the power will be greatly improved, even reaches tens of kilowatts.
How to deal with heat dissipation in high power resistor application circuit PCB:
When designing a circuit on a PCB board, electronic components of various powers will be designed at each position. In many circuit designs, the use of high-power resistors is very important. Since there are many kinds of high-power electronic components, how to accurately place these products can ensure the normal heat dissipation of the circuit without burning other electronic components become challenge for engineers.
When the current flows through the circuit, part of the electric energy will be converted into heat energy. The circuit with enough large current will generate heat, especially where the number of high-power resistors is high. How to separate the resistors and improve the heat dissipation effect of the resistors. The basic idea of setting power limits for a circuit or system is usually to use low operating temperature to prevent any temperature rise that may damage components or materials in the circuit or system, such as dielectric materials used in printed circuit boards.
The heat in the circuit always flows from the higher temperature area to the lower temperature area. Engineers can transfer the heat generated in the high-power circuit away from the heat source, such as transistors or high-power resistors. The heat dissipation path from the heat source should include a destination composed of materials that can dredge or dissipate heat, such as metal grounding layer or radiator. The thermal management of any circuit or system can be best realized only when it is considered at the beginning of the design cycle.
Correctly management for the thermal problem of high-power resistor can effectively reduce the damage of resistor and reduce the burning of other electronic components. When designing the PCB circuit , we should pay more attention to the electronic components of high-power resistor type, and correctly avoiding the heat dissipation problem can effectively solve the hidden danger of circuit safety.
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