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How to choose the power line resistance
Mar 07, 2018

How to choose the power line resistance


It is well-known that the biggest drawback of wirewound resistors is the presence of inductors. A low inductance wirewound resistor can be obtained by winding without inductance, but it is also not without inductance. These inductances can be neglected in circuits with frequency of several hundred Hertz. However, wire-wound resistors can no longer be used in high-frequency loads such as broadcast communication equipment. Membrane planar power resistors and solid ceramic resistors offer no inductance. The parasitic inductance of these resistors is as low as nH. For example, some planar power resistors have a series inductance of less than 10 nH. In the application of high frequency and high pulse, it not only requires the resistor to be non-inductive, but also requires the resistor to have high-energy and anti-pulse characteristics. If the cost permits, the solid ceramic resistor is most suitable.