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The winding resistance appears as a resistance in series with the inductor; it is referred to as DCR (DC resistance). This resistance dissipates some of the reactive energy. The quality factor (or Q) of an inductor is the ratio of its inductive reactance to its resistance at a given frequency, and is a measure of its efficiency. The higher the ...
Mutually coupled inductors can equivalently be represented by a T-circuit of inductors as shown. If the coupling is strong and the inductors are of unequal values then the series inductor on the step-down side may take on a negative value. [32] This can be analyzed as a two port network.
Hence the term winding loss is often preferred. The term load loss is used in electricity delivery to describe the portion of the electricity lost between the generator and the consumer [ 1 ] that is related to the load power (is proportional to the square thereof), as opposed to the no-load loss .
A temperature sensitive resistor with a large, somewhat variable, temperature coefficient of resistance. thermocouple A junction of two dissimilar metals that generates voltage when at a temperature above absolute zero. thermoelectric effect The conversion between heat flow and current flow, and the reverse. thermostat A temperature sensing switch.
The SI unit of absolute thermal resistance is kelvins per watt (K/W) or the equivalent degrees Celsius per watt (°C/W) – the two are the same since the intervals are equal: ΔT = 1 K = 1 °C. The thermal resistance of materials is of great interest to electronic engineers because most electrical components generate heat and need to be cooled.
Normally this also means that the core will not saturate for large differential mode currents, and the maximum current rating is instead determined by the heating effect of the winding resistance. On the other hand, common mode currents see a high impedance path due to the combined inductance of the windings that reinforce each other.
[2] [3] He claimed that the measured transient behaviour of the temperature change cannot be explained by merely the combination of the thermal resistance and the thermal capacitance. Bosworth later extended the experiments to study the thermal mutual inductance; however, he did not report on the thermal inductance in a heat-transfer system ...
For wound components such as inductors and transformers, there is additionally the important effect of parasitic capacitance that exists between the individual turns of the windings. This winding parasitic capacitance will cause the inductor to act as a resonant circuit at some frequency, known as the self-resonant frequency, at which point ...